Self-adaptive reducing screw conveyor and using method thereof

Abstract

The invention relates to the technical field of material conveying, in particular to a self-adaptive variable-diameter screw conveyor and a using method thereof.The self-adaptive variable-diameter screw conveyor comprises a conveyor body shell, a feeding hopper arranged on the upper portion of one end of the conveyor body shell, a discharging opening, a screw shaft, a screw blade and a driving motor, and the diameter of the screw blade is gradually reduced from the feeding end to the discharging end; comprising a fiber material volume acquisition unit, a spiral shaft sound signal acquisition unit and a current acquisition unit; the control module is used for judging whether the conveying of the self-adaptive reducing screw conveyor reaches the standard or not according to the rebound rate of the fiber material; and the correction module is used for determining a rotating speed adjusting strategy aiming at the driving motor according to the peak value proportion difference value and determining an adjusting strategy when the conveying of the self-adaptive reducing screw conveyor does not reach the standard according to the current fluctuation value. The conveying efficiency of the spiral conveyor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material transmission, and in particular to an adaptive variable diameter screw conveyor and a use method thereof. Background Art

[0002] In the fields of agricultural straw recycling and industrial fiber waste processing, screw conveyors are the core equipment for continuous transportation of fiber materials. Their transportation efficiency and material processing quality directly affect the stability of the production process.

[0003] A screw conveyor is a conveyor without a flexible traction member. It relies on a shaft with spiral blades rotating in a closed trough to push the material to move, or it makes a cylinder with internal spiral blades rotate to move the material.

[0004] The working mechanism of a screw conveyor is simply that, under the pushing action of the spiral blades, the material moves upward in a circular direction (and collapses downward at a certain point) while simultaneously flowing in an axial direction. During this complex movement, the material is fully agitated due to the shearing effect of the blades when they squeeze into the mixture, the centrifugal force that throws the mixture away, the shearing effect between the flow layers, and the bidirectional cross-flow of the upper and lower layers.

[0005] A variable diameter screw conveyor is an integrated device that compresses and conveys materials by using a gradient axial change in the diameter of the spiral blades. Its core principle is to utilize the continuous or segmented reduction of the blade outer diameter from the feed end to the discharge end, exerting radial compressive force on the material during conveying while simultaneously achieving axial transport through the screw thrust. The outer diameter of the variable diameter screw is not fixed, but changes in sync with the diameter of the spiral blades.

[0006] Fibrous materials are a type of loose material with plant fibers, synthetic fibers or natural polymer fibers as the main components. Their types include agricultural waste (straw, rice husks, sugarcane bagasse), industrial by-products (textile scraps, wood fiber, pulp) and biomass energy raw materials (energy grass, hemp crops), etc.

[0007] The variable diameter screw conveyor's blade diameter is not fixed. This variation allows the conveyor to better adapt to the characteristics of fibrous materials when conveying them. During the conveying process, as the diameter of the spiral blade changes, a more appropriate driving force can be applied to the fibrous material.

[0008] Chinese patent application publication number: CN109502252A, discloses an anti-blocking screw conveyor, including a body, a power mechanism, a screw conveying mechanism arranged inside the body, and a discharge port provided at the lower part of the tail of the body, a feeding mechanism is provided above the head of the body, and a material stirring device is provided in the feeding mechanism, a screw conveying mechanism is installed inside the body along the transverse length direction of the body, and the screw conveying mechanism rotates to propel the material axially, a second stirring rod is provided on the screw conveying mechanism, and the second stirring rod is provided on the screw conveying mechanism directly below the feeding mechanism, and the screw conveying mechanism is transmission-connected to the power mechanism.

[0009] It can be seen that the above technical solution does not take into account the variable diameter design of the spiral blades, and only uses the stirring rod to assist in dispersing the material. The fiber material cannot be compressed during the transportation process, which is prone to blockage and requires additional anti-blocking structures to passively deal with the blockage, resulting in low transportation efficiency of the screw conveyor. Summary of the Invention

[0010] To this end, the present invention provides an adaptive variable diameter screw conveyor and a method for using the same, so as to overcome the problem that the prior art does not consider the variable diameter design of the spiral blades, and only uses a stirring rod to assist in dispersing the material. The fiber material cannot be compressed during the conveying process and is prone to blockage, and requires additional anti-blocking structures to passively handle the blockage, thereby resulting in low conveying efficiency of the screw conveyor.

[0011] To achieve the above object, the present invention provides an adaptive variable diameter screw conveyor, comprising:

[0012] A machine shell, a feed hopper provided at the upper portion of one end of the machine shell, a discharge port provided at the lower portion of the end of the machine shell away from the feed hopper, a spiral shaft installed through the interior of the shell, and spiral blades provided on the surface of the spiral shaft; a drive motor is provided at the end of the spiral shaft close to the feed hopper; wherein, the end of the machine shell provided with the feed hopper is recorded as the feed end, and the end of the machine shell provided with the discharge port is recorded as the discharge end, and the diameter of the spiral blade gradually decreases from the feed end to the discharge end;

[0013] a data acquisition module, comprising a fiber material volume acquisition unit respectively provided at the feed hopper and the discharge port, a screw shaft sound signal acquisition unit provided at the housing, and a current acquisition unit provided at the drive motor;

[0014] a control module connected to the data acquisition module, for determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material at the discharge port; and for secondary determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the proportion of abnormal sound peaks of the screw shaft within a preset period;

[0015] A correction module is connected to the control module and the drive motor respectively, and is used to determine the speed regulation strategy for the drive motor according to the peak ratio difference and to determine the adjustment strategy when the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor.

[0016] Furthermore, the control module determines that the transportation of the adaptive variable diameter screw conveyor meets the preset standard based on the comparison result that the rebound rate of the fiber material at the discharge port is greater than or equal to the first preset fiber material rebound rate, and when the rebound rate of the fiber material is greater than or equal to the second preset fiber material rebound rate, the control module determines for the second time whether the transportation of the adaptive variable diameter screw conveyor meets the preset standard based on the proportion of abnormal sound peaks of the screw shaft within a preset period, wherein the first preset fiber material rebound rate is less than the second preset fiber material rebound rate.

[0017] Furthermore, the control module determines that the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard based on the comparison result that the rebound rate of the fiber material at the discharge port is less than the first preset fiber material rebound rate, and the correction module determines the adjustment strategy when the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard based on the current fluctuation value of the drive motor.

[0018] Furthermore, the process of obtaining the resilience of the fiber material includes:

[0019] The feed hopper and the discharge port are respectively provided with fiber material volume acquisition units;

[0020] Obtaining by measurement a first volume of the fiber material in the feed hopper and a second volume of the fiber material at the discharge port after compression;

[0021] The compressed volume of the fibrous material is the difference between the first volume of the material and the second volume of the fibrous material;

[0022] After the fiber material is discharged from the discharge port and allowed to stand for a first preset time, the volume of the material after rebound stabilization is measured and recorded as the third volume;

[0023] The rebound volume of the fiber material is the difference between the third volume and the second volume;

[0024] The fiber material rebound rate is the ratio of the fiber material rebound volume to the fiber material compressed volume.

[0025] Furthermore, the control module determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the abnormal sound peak ratio of the screw shaft within the preset period.

[0026] If the abnormal sound peak ratio is less than the preset ratio, it is determined that the conveying of the adaptive variable diameter screw conveyor meets the preset standard;

[0027] If the abnormal sound peak ratio is greater than or equal to the preset ratio, it is determined that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard, the control module controls to stop feeding, and after a second preset time delay, the correction module executes the speed adjustment strategy for the drive motor.

[0028] Furthermore, the abnormal sound peak ratio is the ratio between the number of abnormal sound peaks and the total number of sound peaks within a preset period, wherein the abnormal sound peak is a sound peak whose sound peak exceeds the preset sound peak.

[0029] Furthermore, the process of the correction module determining the speed regulation strategy for the drive motor according to the peak ratio difference includes:

[0030] Comparing the peak ratio difference with the first preset peak ratio difference and the second preset peak ratio difference respectively;

[0031] If the peak ratio difference is less than the first preset peak ratio difference, reducing the speed of the drive motor to a second preset speed;

[0032] If the peak ratio difference is greater than or equal to the first preset peak ratio difference and less than the second preset peak ratio difference, the speed of the drive motor is first reduced to zero speed and maintained at zero speed for a third preset time, the speed of the drive motor is reversed and the reverse speed is increased to a third preset speed and maintained at the third preset speed for a fourth preset time, the speed of the drive motor is reversed and the forward speed is increased to a fourth preset speed, and at the same time the control module controls the resumption of feeding;

[0033] If the peak ratio difference is greater than or equal to the second preset peak ratio difference, shut down the machine and issue an alarm;

[0034] The peak ratio difference is the difference between the abnormal sound peak ratio and the preset ratio.

[0035] Furthermore, the correction module determines an adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the driving motor, wherein:

[0036] If the current fluctuation value is less than the preset current fluctuation value, reducing the input amount of the fiber material according to the difference between the preset current fluctuation value and the current fluctuation value;

[0037] If the current fluctuation value is greater than or equal to the preset current fluctuation value, the machine will be shut down and an alarm will be issued.

[0038] Furthermore, the current fluctuation value of the driving motor is the absolute value of the difference between the current of the driving motor and a preset current.

[0039] In another aspect, the present invention provides a method for using an adaptive variable diameter screw conveyor, comprising:

[0040] The drive motor is started to a first preset speed, so that the spiral shaft drives the spiral blades to rotate, and the fiber material is fed into the feed hopper. During the transportation of the fiber material, the data acquisition module collects the sound signal of the spiral shaft when it is running and the current of the drive motor. The fiber material is transported to the discharge port through the spiral blades; wherein the fiber material volume acquisition unit of the data acquisition module collects a first volume of the fiber material in the feed hopper, a second volume of the fiber material at the discharge port after compression, and a third volume of the fiber material after it has been allowed to stand for a first preset time.

[0041] When the control module calculates the rebound rate of the fiber material and determines that the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material, the control module secondarily determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the peak ratio of the abnormal sound of the screw shaft within a preset period; wherein, when the control module secondarily determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard based on the peak ratio of the abnormal sound of the screw shaft within the preset period, the correction module determines the speed adjustment strategy for the drive motor based on the peak ratio difference;

[0042] When the control module determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the rebound rate of the fiber material, the correction module determines the adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the driving motor;

[0043] When the conveying task is completed, the drive motor is controlled to stop running.

[0044] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention breaks through the limitations of equal-diameter spiral blades, which have poor compression effects on fiber materials and rely on mechanical structures for passive anti-blocking, by combining the structure of variable-diameter spiral blades with multi-dimensional data monitoring, graded intelligent judgment, and dynamic adaptive adjustment; the diameter of the spiral blades gradually decreases from the feed end to the discharge end, forming a natural compression channel. This design enables the fiber material to continuously withstand increasing axial extrusion pressure during the conveying process, effectively suppressing its rebound potential energy; at the same time, a preliminary judgment of the conveying quality is achieved by calculating the rebound rate of the fiber material, and a secondary verification is performed in combination with the abnormal sound peak ratio to form a graded judgment logic, which effectively avoids misjudgment of a single indicator and ensures accurate judgment of the conveying status; the correction module dynamically adjusts the drive motor speed, the fiber material input amount, or initiates emergency measures according to the judgment result, realizing fault adaptive processing, thereby improving conveying efficiency.

[0045] Furthermore, by gradually reducing the diameter of the spiral blades from the feed end to the discharge end, the present invention achieves gradual compression of the fiber material during conveying, avoiding material agglomeration, entanglement, or fiber structure damage caused by the instantaneous compression of the spiral blades of constant diameter. This gradual compression method not only ensures the density of the material during conveying, but also reduces the risk of blockage caused by localized over-compression, thereby improving the adaptability of the conveying process to the physical properties of the fiber material.

[0046] Furthermore, the present invention first makes a preliminary judgment based on the rebound rate of the fiber material at the discharge port through the control module. When the rebound rate of the fiber material is greater than or equal to a first preset value, the transportation meets the standard to reduce unnecessary intervention and improve efficiency; when the rebound rate of the fiber material is greater than a second preset value, the abnormal sound peak ratio of the spiral shaft is introduced for secondary judgment. This dual judgment mechanism can more comprehensively and accurately reflect the actual operating status of the conveyor, avoid the misjudgment that may be caused by a single judgment basis, and thus improve the reliability of the evaluation.

[0047] Furthermore, this invention uses fiber material rebound rate as a quantitative indicator for measuring compression quality and stability. By comparing the rebound rate with a preset threshold, the control module transforms abstract compression quality requirements into specific decision logic, enabling precise decision-making based on objective data. Furthermore, the dynamic changes in rebound rate provide feedback for adaptive control. When the rebound rate falls within different ranges, the control module adaptively switches the decision dimension, thereby improving the adaptability of the fiber material and the controllability of the conveying quality.

[0048] Furthermore, the present invention divides the response mechanism into three levels based on the peak ratio difference through the correction module. In case of mild abnormality, local friction is alleviated by reducing the speed of the driving motor to avoid forced conveying and damaging the blades; in case of moderate abnormality, a timing adjustment strategy of zero-speed stop, reverse rotation, and forward recovery is adopted to achieve reverse loosening of stuck materials and forward output of residual accumulated materials; in case of severe abnormality, the machine is shut down directly and an alarm is issued to prevent equipment damage, thereby improving the reliability of equipment operation.

[0049] Furthermore, the present invention reduces the input amount of fiber material according to the difference between a preset current fluctuation value and the current fluctuation value, thereby achieving precise control over the reduction range of the input amount of fiber material. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic structural diagram of an adaptive variable diameter screw conveyor according to an embodiment of the present invention;

[0051] Figure 2 This is a flow chart of an embodiment of the present invention for determining whether the conveying of a self-adaptive variable diameter screw conveyor meets a preset standard based on the rebound rate of a fiber material;

[0052] Figure 3 A flow chart of an adjustment strategy for determining when the delivery of an adaptive variable diameter screw conveyor does not meet a preset standard according to an embodiment of the present invention;

[0053] Figure 4 This is a flow chart of a method for using the adaptive variable diameter screw conveyor according to an embodiment of the present invention;

[0054] In the figure, 1. body shell; 2. feed hopper; 3. discharge port; 4. screw shaft; 5. screw blade; 6. drive motor. DETAILED DESCRIPTION

[0055] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0056] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0057] It should be pointed out that the data in this embodiment are all obtained by comprehensive analysis and evaluation of the historical test data of the present invention in the three months before this test and the corresponding historical test results. Those skilled in the art can understand that the method of determining the above-mentioned single parameter of the method of the present invention can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, use weighted summation to use the obtained value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained value.

[0058] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, they are respectively a structural schematic diagram of the adaptive variable diameter screw conveyor according to an embodiment of the present invention; a flow chart of determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard according to the rebound rate of the fiber material according to an embodiment of the present invention; a flow chart of an adjustment strategy when determining that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to an embodiment of the present invention; and a flow chart of a method for using the adaptive variable diameter screw conveyor according to an embodiment of the present invention.

[0059] In one aspect, an embodiment of the present invention provides an adaptive variable diameter screw conveyor, comprising:

[0060] A machine body shell 1 is provided with a feed hopper 2 at the upper part of one end of the machine body shell 1, a discharge port 3 is provided at the lower part of the end of the machine body shell 1 away from the feed hopper 2, a spiral shaft 4 is installed through the interior of the shell, and a spiral blade 5 is provided on the surface of the spiral shaft 4; a drive motor 6 is provided at the end of the spiral shaft 4 close to the feed hopper 2; wherein, the end of the machine body shell 1 provided with the feed hopper 2 is recorded as the feed end, and the end of the machine body shell 1 provided with the discharge port 3 is recorded as the discharge end, and the diameter of the spiral blade 5 gradually decreases from the feed end to the discharge end;

[0061] A data acquisition module, comprising a fiber material volume acquisition unit respectively provided at the feed hopper 2 and the discharge port 3, a screw shaft sound signal acquisition unit provided at the housing 1, and a current acquisition unit provided at the drive motor 6;

[0062] a control module connected to the data acquisition module, for determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material at the discharge port 3; and for secondary determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the proportion of abnormal sound peaks of the screw shaft 4 within a preset period;

[0063] A correction module is respectively connected to the control module and the drive motor 6, and is used to determine the speed regulation strategy for the drive motor 6 according to the peak ratio difference and to determine the adjustment strategy when the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor 6.

[0064] It should be noted that the data in this embodiment are all obtained through preliminary experimental verification using the method described in the present invention before this test. The preset values ​​can be adjusted according to specific usage conditions, as long as the method described in the present invention can clearly define the different specific situations in the single determination process through the obtained values. The preset values ​​set in this embodiment are all obtained based on preliminary experiments, including the various correction coefficients, which were also selected through experimental verification.

[0065] Specifically, the spiral blades 5 extend axially along the spiral shaft 4, and their outer diameter changes continuously from the feed end to the discharge end. The diameter of each circle of spiral blades 5 is smaller than the diameter of the previous circle (i.e., close to the feed end) of the spiral blades 5, and the diameter difference between two adjacent circles of blades is a constant value, forming a variable diameter spiral conveying surface. In this embodiment, the constant value is selected as 3 mm.

[0066] In this embodiment, the fiber material volume acquisition unit is a three-dimensional laser scanner; the spiral shaft sound signal acquisition unit is a sound sensor; and the current acquisition unit is a Hall current sensor.

[0067] Specifically, there is no limitation on the specific structures of the control module and the correction module. The control module and the correction module themselves and the units therein can be composed of logic components, and the logic components include field programmable components, computers or microprocessors in computers.

[0068] Specifically, the control module determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard according to the rebound rate of the fiber material at the discharge port 3, wherein:

[0069] If the fiber material rebound rate is less than the first preset fiber material rebound rate of 0.40, it is determined that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard, and the correction module determines the adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor 6;

[0070] If the fiber material rebound rate is greater than or equal to the first preset fiber material rebound rate and less than the second preset fiber material rebound rate, it is determined that the conveying of the adaptive variable diameter screw conveyor meets the preset standard;

[0071] If the fiber material rebound rate is greater than or equal to the second preset fiber material rebound rate of 0.60, it is determined that the transportation of the adaptive variable diameter screw conveyor meets the preset standard, and the transportation of the adaptive variable diameter screw conveyor meets the preset standard is secondarily determined based on the abnormal sound peak ratio of the screw shaft 4 within the preset period.

[0072] Specifically, the value range of the first preset fiber material rebound rate is (0.15, 0.45), the value range of the second preset fiber material rebound rate is (0.50, 0.70), preferably, the first preset fiber material rebound rate is selected as 0.40, and the second preset fiber material rebound rate is selected as 0.60.

[0073] Specifically, fiber materials are characterized by their elastic deformation capacity: when subjected to the compressive force of a screw conveyor, they undergo plastic deformation (volume reduction). However, due to hydrogen bonding between fibers and the mechanical entanglement of their structures, they rebound elastically after the pressure is released. Their rebound rate essentially reflects the integrity of the fiber structure. A low rebound rate indicates excessive compression, leading to fiber breakage and structural damage, resulting in a loss of elastic recovery. A high rebound rate indicates insufficient compression, resulting in ineffective compression of the interfiber spaces (excessive elastic recovery space).

[0074] Specifically, the process of obtaining the resilience of the fiber material includes:

[0075] The feed hopper 2 and the discharge port 3 are respectively provided with fiber material volume acquisition units;

[0076] The first volume of the fiber material in the feed hopper 2 and the second volume of the fiber material after compression at the discharge port 3 are obtained by measuring;

[0077] The compressed volume of the fibrous material is the difference between the first volume of the material and the second volume of the fibrous material;

[0078] The fiber material is discharged from the discharge port 3 and allowed to stand for a first preset time of 12 minutes, and the volume of the material after rebound stabilization is measured and recorded as the third volume;

[0079] The rebound volume of the fiber material is the difference between the third volume and the second volume;

[0080] The fiber material rebound rate is the ratio of the fiber material rebound volume to the fiber material compressed volume.

[0081] Specifically, the control module determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the abnormal sound peak ratio of the screw shaft 4 within a preset period of 10 minutes.

[0082] If the abnormal sound peak ratio is less than the preset ratio of 0.08, it is determined that the conveying of the adaptive variable diameter screw conveyor meets the preset standard;

[0083] If the abnormal sound peak ratio is greater than or equal to the preset ratio, it is determined that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard, and the control module controls to stop feeding. After a second preset time delay of 3 minutes, the correction module executes the speed adjustment strategy for the drive motor 6.

[0084] Specifically, after the control module determines that the conveying does not meet the standards and stops feeding, some fiber material may still remain in the screw conveyor's conveying pipe. If the speed adjustment of the drive motor 6 is immediately executed, the residual material will cause abnormal load on the screw shaft 4. The second preset delay time is set to allow the screw conveyor to enter a stable state after stopping feeding, so as to prevent residual material from interfering with subsequent adjustment strategies.

[0085] In this embodiment, the preset ratio is 0.08, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0086] Specifically, the abnormal sound peak ratio is the ratio between the number of abnormal sound peaks and the total number of sound peaks within a preset period, wherein the abnormal sound peak is a sound peak that exceeds the preset sound peak by 92dB.

[0087] Specifically, the process of the correction module determining the speed regulation strategy for the drive motor 6 according to the peak ratio difference includes:

[0088] The peak ratio difference is compared with the first preset peak ratio difference of 0.02 and the second preset peak ratio difference of 0.05 respectively;

[0089] If the peak ratio difference is less than the first preset peak ratio difference, the speed of the drive motor 6 is reduced to a second preset speed of 720 rpm;

[0090] If the peak ratio difference is greater than or equal to the first preset peak ratio difference and less than the second preset peak ratio difference, the speed of the drive motor 6 is first reduced to zero speed and maintained at zero speed for a third preset time of 30 seconds, the speed of the drive motor 6 is reversed and the reverse speed is increased to a third preset speed of 540 rpm and maintained at the third preset speed for a fourth preset time of 90 seconds, the speed of the drive motor 6 is forward and the forward speed is increased to a fourth preset speed of 810 rpm. At the same time, the control module controls the resumption of feeding;

[0091] If the peak ratio difference is greater than or equal to the second preset peak ratio difference, shut down the machine and issue an alarm;

[0092] The peak ratio difference is the difference between the abnormal sound peak ratio and the preset ratio.

[0093] Specifically, the first preset peak ratio difference is selected as 0.02, and the second preset peak ratio difference is selected as 0.05, but the above values ​​are not limited thereto, and those skilled in the art may also adjust the values ​​according to actual needs.

[0094] Specifically, the second preset speed is 80%-85% of the first preset speed; the third preset speed is 50%-70% of the first preset speed; the fourth preset speed is 88%-90% of the first preset speed, wherein the second preset speed is in the same direction as the first preset speed, the third preset speed is in the opposite direction to the first preset speed, and the fourth preset speed is in the same direction as the first preset speed; in this embodiment, the second preset speed is 80% of the first preset speed, that is, 720 rpm, the third preset speed is 60% of the first preset speed, that is, 540 rpm, and the fourth preset speed is 90% of the first preset speed, that is, 810 rpm.

[0095] Specifically, the driving motor 6 is first allowed to stand still after being reduced to zero speed, in order to loosen the fiber materials in the screw conveyor and reduce the impact during reverse operation.

[0096] Specifically, the correction module determines the adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor 6, wherein,

[0097] If the current fluctuation value is less than the preset current fluctuation value of 5A, the input amount of the fiber material is reduced according to the difference between the preset current fluctuation value and the current fluctuation value;

[0098] If the current fluctuation value is greater than or equal to the preset current fluctuation value, the machine will be shut down and an alarm will be issued.

[0099] Specifically, the reduction in the input amount of the fiber material is positively correlated with the difference between the preset current fluctuation value and the current fluctuation value, wherein the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the difference between the preset current fluctuation value and the current fluctuation value, the greater the reduction in the input amount of the fiber material.

[0100] Specifically, the current fluctuation value of the driving motor 6 is the absolute value of the difference between the current of the driving motor 6 and the preset current 22A.

[0101] In this embodiment, the preset current fluctuation value is selected as 5A, but the above value is not limited thereto, and those skilled in the art can also adjust the value according to actual needs.

[0102] On the other hand, an embodiment of the present invention provides a method for using an adaptive variable diameter screw conveyor, comprising:

[0103] Step S1: Start the drive motor 6 to a first preset speed of 900 rpm, so that the spiral shaft 4 drives the spiral blade 5 to rotate, and feed the fiber material into the feed hopper 2. During the transportation of the fiber material, the data acquisition module collects the sound signal of the spiral shaft 4 when it is running and the current of the drive motor 6. The fiber material is transported to the discharge port 3 through the spiral blade 5; wherein, the fiber material volume acquisition unit of the data acquisition module collects a first volume of the fiber material in the feed hopper 2, a second volume of the fiber material after compression at the discharge port 3, and a third volume of the fiber material after it has been allowed to stand for a first preset time.

[0104] Step S2: When the control module calculates the rebound rate of the fiber material and determines that the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material, the control module secondarily determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the peak ratio of the abnormal sound of the screw shaft 4 within the preset period; wherein, when the control module secondarily determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard based on the peak ratio of the abnormal sound of the screw shaft 4 within the preset period, the correction module determines the speed adjustment strategy for the drive motor 6 based on the peak ratio difference;

[0105] Step S3: When the control module determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the rebound rate of the fiber material, the correction module determines an adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor 6;

[0106] Step S4: When the transport task is completed, the drive motor 6 is controlled to stop running.

[0107] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0108] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An adaptive variable diameter screw conveyor, characterized in that: include: A machine shell, a feed hopper provided at the upper portion of one end of the machine shell, a discharge port provided at the lower portion of the end of the machine shell away from the feed hopper, a spiral shaft installed through the interior of the shell, and spiral blades provided on the surface of the spiral shaft; a drive motor is provided at the end of the spiral shaft close to the feed hopper; wherein, the end of the machine shell provided with the feed hopper is recorded as the feed end, and the end of the machine shell provided with the discharge port is recorded as the discharge end, and the diameter of the spiral blade gradually decreases from the feed end to the discharge end; a data acquisition module, comprising a fiber material volume acquisition unit respectively provided at the feed hopper and the discharge port, a screw shaft sound signal acquisition unit provided at the housing, and a current acquisition unit provided at the drive motor; a control module connected to the data acquisition module, for determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material at the discharge port; and for secondary determining whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the proportion of abnormal sound peaks of the screw shaft within a preset period; A correction module is connected to the control module and the drive motor respectively, and is used to determine the speed regulation strategy for the drive motor according to the peak ratio difference and to determine the adjustment strategy when the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the drive motor.

2. The adaptive variable diameter screw conveyor according to claim 1, characterized in that: The control module determines whether the transportation of the adaptive variable diameter screw conveyor meets the preset standard based on the comparison result that the fiber material rebound rate at the discharge port is greater than or equal to the first preset fiber material rebound rate, and when the fiber material rebound rate is greater than or equal to the second preset fiber material rebound rate, the control module determines whether the transportation of the adaptive variable diameter screw conveyor meets the preset standard for the second time based on the proportion of abnormal sound peaks of the screw shaft within a preset period, wherein the first preset fiber material rebound rate is less than the second preset fiber material rebound rate.

3. The adaptive variable diameter screw conveyor according to claim 2, characterized in that: The control module determines that the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard based on the comparison result that the rebound rate of the fiber material at the discharge port is less than the first preset fiber material rebound rate. The correction module determines the adjustment strategy when the transportation of the adaptive variable diameter screw conveyor does not meet the preset standard based on the current fluctuation value of the drive motor.

4. The adaptive variable diameter screw conveyor according to claim 3, characterized in that: The process of obtaining the resilience of the fiber material includes: The feed hopper and the discharge port are respectively provided with fiber material volume acquisition units; Obtaining by measurement a first volume of the fiber material in the feed hopper and a second volume of the fiber material at the discharge port after compression; The compressed volume of the fibrous material is the difference between the first volume of the material and the second volume of the fibrous material; After the fiber material is discharged from the discharge port and allowed to stand for a first preset time, the volume of the material after rebound stabilization is measured and recorded as the third volume; The rebound volume of the fiber material is the difference between the third volume and the second volume; The fiber material rebound rate is the ratio of the fiber material rebound volume to the fiber material compressed volume.

5. The adaptive variable diameter screw conveyor according to claim 4, characterized in that: The control module determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the abnormal sound peak ratio of the screw shaft within the preset period. If the abnormal sound peak ratio is less than the preset ratio, it is determined that the conveying of the adaptive variable diameter screw conveyor meets the preset standard; If the abnormal sound peak ratio is greater than or equal to the preset ratio, it is determined that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard, the control module controls to stop feeding, and after a second preset time delay, the correction module executes the speed adjustment strategy for the drive motor.

6. The adaptive variable diameter screw conveyor according to claim 5, characterized in that: The abnormal sound peak ratio is the ratio between the number of abnormal sound peaks and the total number of sound peaks within a preset period, wherein the abnormal sound peak is a sound peak whose sound peak exceeds the preset sound peak.

7. The adaptive variable diameter screw conveyor according to claim 5, characterized in that: The process of the correction module determining the speed regulation strategy for the drive motor according to the peak ratio difference includes: Comparing the peak ratio difference with the first preset peak ratio difference and the second preset peak ratio difference respectively; If the peak ratio difference is less than the first preset peak ratio difference, reducing the speed of the drive motor to a second preset speed; If the peak ratio difference is greater than or equal to the first preset peak ratio difference and less than the second preset peak ratio difference, the speed of the drive motor is first reduced to zero speed and maintained at zero speed for a third preset time, the speed of the drive motor is reversed and the reverse speed is increased to a third preset speed and maintained at the third preset speed for a fourth preset time, the speed of the drive motor is reversed and the forward speed is increased to a fourth preset speed, and at the same time the control module controls the resumption of feeding; If the peak ratio difference is greater than or equal to the second preset peak ratio difference, shut down the machine and issue an alarm; The peak ratio difference is the difference between the abnormal sound peak ratio and the preset ratio.

8. The adaptive variable diameter screw conveyor according to claim 7, characterized in that: The correction module determines the adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the driving motor, wherein: If the current fluctuation value is less than the preset current fluctuation value, reducing the input amount of the fiber material according to the difference between the preset current fluctuation value and the current fluctuation value; If the current fluctuation value is greater than or equal to the preset current fluctuation value, the machine will be shut down and an alarm will be issued.

9. The adaptive variable diameter screw conveyor according to claim 8, characterized in that: The current fluctuation value of the driving motor is the absolute value of the difference between the current of the driving motor and the preset current.

10. A method for using the adaptive variable diameter screw conveyor according to any one of claims 1 to 9, characterized in that: include: The drive motor is started to a first preset speed, so that the spiral shaft drives the spiral blades to rotate, and the fiber material is fed into the feed hopper. During the transportation of the fiber material, the data acquisition module collects the sound signal of the spiral shaft when it is running and the current of the drive motor. The fiber material is transported to the discharge port through the spiral blades; wherein the fiber material volume acquisition unit of the data acquisition module collects a first volume of the fiber material in the feed hopper, a second volume of the fiber material at the discharge port after compression, and a third volume of the fiber material after it has been allowed to stand for a first preset time. When the control module calculates the rebound rate of the fiber material and determines that the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the rebound rate of the fiber material, the control module secondarily determines whether the conveying of the adaptive variable diameter screw conveyor meets the preset standard based on the peak ratio of the abnormal sound of the screw shaft within a preset period; wherein, when the control module secondarily determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard based on the peak ratio of the abnormal sound of the screw shaft within the preset period, the correction module determines the speed adjustment strategy for the drive motor based on the peak ratio difference; When the control module determines that the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the rebound rate of the fiber material, the correction module determines the adjustment strategy when the conveying of the adaptive variable diameter screw conveyor does not meet the preset standard according to the current fluctuation value of the driving motor; When the conveying task is completed, the drive motor is controlled to stop running.

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