A method and system for adaptive speed control of a conveyor belt to increase the spacing of material packages

Abstract

The application discloses a kind of conveying belt adaptive speed regulation control method and system for increasing material package spacing, the method includes: preset time value T0 and T, T0 Less than t2;The initial signal of first, second sensor C1, C2 is all 0, the time when C1 detects material package is recorded as 0, the signal of C1 becomes 1, and the counter starts timing;When the counter reaches T0, C2 starts detection, and the counter continues timing;When C1 detects that material package leaves, the signal of C1 becomes 0, and the counter continues timing T seconds;In (T0, t2+T), if C2 detects material package, C2 becomes 1, and variable-speed conveying belt slows down or pauses;When the counter is t2+T, reset all relevant parameters, the counter is zero, and variable-speed conveying belt restores original speed, returns preset time value T0 and T, and carries out next round detection.The method provided by the application realizes to pull apart material package spacing by adaptively changing the speed of conveying belt.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of PLC of industrial automation, and in particular to a method and system for adaptive speed control of a conveyor belt for increasing the spacing between material packages. BACKGROUND

[0002] Conveyor belts are widely used in assembly lines. In general, the conveyor belts on automated assembly lines convey materials at a constant speed. In some cases, two or more conveyor systems are used to change the speed of the input and output of the assembly line, and the speed of the conveyor belt is set to change the speed of the materials reaching the end of the line. However, this method cannot actively change or adjust the spacing between the material packages. When the conveyor belt is part of an automated system, in order to ensure that the material packages are evenly spaced or meet certain spacing requirements, the constant speed conveyor system and the uniform speed segmented conveyor system cannot meet the requirements of the automated system.

[0003] On a conveyor belt, the input end controls the relative spacing of the material packages, and the automated processing equipment at the end processes the material packages according to the spacing. If the spacing between the material packages is too large, the subsequent equipment can wait, but if the spacing between the material packages is too small, the subsequent equipment may not be able to speed up the movement, causing the materials to be blocked and the system to be disrupted. Material package spacing may suddenly and irregularly decrease due to material input end failures, unexpected blockages during material conveying, and material package movement inspections. SUMMARY

[0004] To solve the above problems and deficiencies of the prior art, the present application provides a method and system for adaptive speed control of a conveyor belt for increasing the spacing between material packages. The method adaptively changes the speed of the conveyor belt during actual production to appropriately increase the spacing between the material packages and meet the requirements of subsequent automated equipment for the spacing between the material packages.

[0005] A first object of the present application is to provide a method for adaptive speed control of a conveyor belt for increasing the spacing between material packages.

[0006] A second object of the present application is to provide a system for adaptive speed control of a conveyor belt for increasing the spacing between material packages.

[0007] The first object of the present application can be achieved by adopting the following technical solutions:

[0008] A method for adaptive speed control of a conveyor belt for increasing the spacing between material packages, the method comprising:

[0009] The preset time values are T0 and T, wherein T is a control time of the minimum distance between the material packages, and T0 is a second sensor starting detection time, and T0 is less than a time t2 of the material package passing through the first sensor;

[0010] The time when the first sensor detects the material package is recorded as 0 time, the signal of the first sensor changes from 0 to 1, and the counter starts timing;

[0011] When the counter counts the time to T0, the second sensor starts detection, and the counter continues timing;

[0012] When the first sensor detects the time when the material package leaves, the signal of the first sensor changes from 1 to 0, and the counter continues timing for T seconds;

[0013] In the time interval (T0, t2+T), the second sensor continuously detects, if no material package is detected, the signal of the second sensor is 0, and the variable speed conveying belt keeps the original speed unchanged; otherwise, the signal of the second sensor changes to 1, and the variable speed conveying belt slows down or stops;

[0014] When the counter times to t2+T, the signals of the first sensor and the second sensor reset, the counter is cleared, the variable speed conveying belt restores the original speed, the current detection process ends, and the preset time values T0 and T are returned, and the next round of detection is waited.

[0015] Further, the preset time value T is set as one or more parameters.

[0016] Further, if the preset time value T is set as multiple parameters, the multiple parameters are respectively set with the number of uses.

[0017] The second object of the application can be achieved by adopting the following technical scheme:

[0018] A conveying belt adaptive speed control system for increasing the distance between material packages, the system comprising a combined detection sensor, a PLC controller, a double-layer synchronous combined variable speed conveying belt and a constant speed conveying belt, the PLC controller being connected with the combined detection sensor, the double-layer synchronous combined variable speed conveying belt and the constant speed conveying belt respectively;

[0019] After the PLC controller obtains the signal of the combined detection sensor, the signal is compared and calculated, and a signal for controlling the variable speed is sent to the components of the double-layer synchronous combined variable speed conveying belt, so that the relative speed between the double-layer synchronous combined variable speed conveying belt and the constant speed conveying belt reaches the required requirement of the system.

[0020] Further, the combined detection sensor comprises a first sensor and a second sensor, the first sensor is installed on the rack of the constant speed conveying belt, and the second sensor is installed on the rack of the double-layer synchronous combined variable speed conveying belt and maintains a distance from the first sensor.

[0021] Further, the distance between the first sensor and the second sensor is less than the sum of the length of a bale of material and the regular spacing between two bales of material.

[0022] Further, the first sensor and the second sensor are any one of grating, photoelectric, optical fiber, etc.

[0023] Further, the uniform conveying belt is any structure of a conveying belt device driven by a motor, the speed of the motor is controlled by a frequency converter, and the frequency converter is controlled by a PLC.

[0024] Further, the double-layer synchronous combination variable-speed conveying belt is any synchronous speed-regulating double-layer conveying belt device or any structure of a single-layer conveying belt device driven by a motor, and the PLC synchronously controls the frequency converter to change the speed of the conveying belt.

[0025] Further, the double-layer conveying belt device comprises upper and lower conveying belts, and the bale of material is moved by being clamped by the upper and lower conveying belts.

[0026] The present application has the following beneficial effects relative to the prior art:

[0027] 1. The system provided by the present application has the technical feature of self-adaptive intelligent control, simple device structure, few accessories, and easy implementation.

[0028] 2. The method provided by the present application has high speed control precision and good stability by self-adaptively changing the speed of the conveying belt, and the method has generalizability and universality. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0030] Figure 1 The structure diagram of the conveying belt self-adaptive speed control system for increasing the spacing of bales of material provided by the present embodiment.

[0031] Figure 2 The time setting and speed regulation principle diagram of the conveying belt control provided by the present embodiment.

[0032] Figure 3 The variable-speed conveying belt structure and sensor group installation schematic diagram provided by the present embodiment.

[0033] Figure 4The variable speed control flow chart of the conveying belt provided by the embodiment. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. It should be understood that the described specific embodiments are only used to explain the present application, and are not used to limit the present application.

[0035] Embodiment:

[0036] Figure 1 is the structural diagram of the conveying belt adaptive speed control system provided by the embodiment for increasing the spacing of material packages, and is also an explanation of the connection relationship between the hardware of the system. The PLC controller as the central control unit is connected with the uniform speed conveying belt, the double-layer synchronous combined variable speed conveying belt and the combined detection sensor respectively. The uniform speed conveying belt can be any structure of the conveying belt device driven by a motor, the speed of the motor is given by the frequency converter, and the frequency converter is controlled by the PLC. The double-layer synchronous combined variable speed conveying belt can be any synchronous speed-adjustable conveying belt device, or any structure of the single-layer conveying belt device driven by a motor, and the PLC synchronously controls the frequency converter to change the speed of the conveying belt. The sensors in the sensor group can be any sensor capable of detecting the passing of the material package, such as grating, photoelectricity, optical fiber, etc. After the PLC controller obtains the signals of the sensor group, the relative speed between the uniform speed conveying belt and the variable speed conveying belt reaches the required requirements of the system through comparison and calculation, and the signals for controlling the variable speed are sent to the components of the variable speed conveying belt.

[0037] Figure 2 is the time setting and speed regulation principle diagram of the conveying belt control of the embodiment. Figure 2 T is defined as the control time of the minimum spacing between the packages in the embodiment, T0 is the time when the sensor C2 starts detecting after the sensor C1 has detected the material package, and both the time T0 and T are pre-set values. t2 is the actual time of the material package passing through the sensor C1, and when the conveying belt at the detection point position of C1 is at a constant speed, t2 will only be slightly affected by the position of the material package parallel or inclined to the conveying belt. The positions of the time 0, T0 and t2 relative to the material A package and the sensor C1 are shown in Figure 2 In order to detect the minimum spacing between the packages, it is required that T0 is set to be less than the time of the material A package passing through the sensor C1 at the fastest speed, i.e. 0 min t2 min is the shortest time of the material A package passing through the sensor C1.

[0038] Figure 2 The distance diagram of the material package B in the figure is relative to the material package A. When the sensor C2 starts scanning, once the material package is scanned in the time interval (T0, t2+T), the variable speed conveyor belt is controlled to reduce speed or pause until the original speed is restored at time T+t2.

[0039] If the material package is not scanned in the time interval (T0, T+t2), the variable speed conveyor belt remains at the original speed, and C2 continues to detect until time t2+T, resets all related parameters, and starts the next round of detection and speed adjustment.

[0040] Figure 3 The figure is a schematic diagram of the variable speed conveyor belt structure and sensor group installation of the embodiment. It can be horizontal to convey materials, or it can be inclined at an angle to convey materials, as shown in Figure 3 . Figure 3 1 and 2 in the figure are sensors C1 and C2, 1 represents that the sensor C1 is installed on the frame of the constant speed conveyor belt, 2 represents that the sensor C2 is installed on the frame of the variable speed conveyor belt, 3 is a schematic diagram of the double-layer structure of the variable speed conveyor belt, and the double-layer structure of the variable speed conveyor belt can also be any single-layer conveyor belt, and 4 is a schematic diagram of the material package. The variable speed conveyor belt of the embodiment is designed to be a double-layer conveyor belt for synchronous conveying. When the speed is adjusted, the speed of the upper and lower conveyor belts is adjusted synchronously to make them have the same linear speed. The design of the double-layer conveyor belt mechanism achieves the following two purposes. One is to prevent the material package from slipping at the moment when the speed of the conveyor belt changes by adjusting the relative distance of the original fixed double-layer conveyor belt, and the other is to adjust the shape of the material package through the distance between the double-layer conveyor belts after the material package enters the double-layer conveyor belt area, which is not conducive to the subsequent automatic equipment processing.

[0041] The sensor C1 is installed on the constant speed conveyor belt, and the installation position of the sensor C2 is adjusted according to actual use requirements, but the distance between the C2 and the C1 is less than the sum of the length of a material package and the normal distance between the material packages, that is, H C1C2 <2L min , wherein H C1C2 is the distance between the sensors C1 and C2, and L min is the minimum length of the material package detected by the sensor C1.

[0042] Figure 4 The figure is a variable speed control flowchart of the conveyor belt provided by the embodiment. The following will be described in detail in combination with Figure 4 the process of automatic variable speed of the material conveyor belt and the parameters involved:

[0043] (1) Manually preset time values T0 and T, wherein T is the control time of the minimum interval between bags, and T0 is the time when the sensor C2 starts detecting, and T0 is required to be less than the time t2 when the material bag passes through the sensor C1, as shown in Figure 2 .

[0044] (2) The time when the C1 detection point detects the cement bag, i.e. the absolute time when the C1 signal changes from "0" to "1", is recorded as the 0 time, and the counter starts timing.

[0045] (3) The counter counts the time to T0, and the sensor C2 starts detecting.

[0046] (4) The counter continues to time, and when the sensor C1 detects that the material bag leaves, i.e. the C1 signal changes from "1" to "0", the time is recorded as t2. The time length shown by t2 represents the time of the material bag passing through the sensor C1 in step (1).

[0047] (5) The counter continues to time T seconds, and C2 continues to detect within the time interval (T0, t2+T). If no material bag is detected, i.e. the C2 signal is always "0", the variable speed conveyor belt remains unchanged. Otherwise, if a material bag is detected, i.e. the C2 signal changes to "1", the variable speed conveyor belt immediately slows down or stops.

[0048] (6) When the counter times to t2+T, reset all related parameters, and the counter is cleared, at the same time, the variable speed conveyor belt returns to the original speed. The current detection process is ended, and returns to step (1) to wait for the next round of detection.

[0049] According to the actual use, the time T can be set to multiple parameters, i.e. T1, T2, T3, etc., and the use times and rules of each time parameter are set, for example, T1 is used to adjust the speed for 3 times, then T2 is used to adjust the speed for 1 time, and then T3 is used to adjust the speed for 2 times. After the use rules of T1, T2 and T3 are determined, the speed of the conveyor belt in the case of T1, T2 and T3 is executed in turn, i.e. T1, T2 and T3 are combined as T parameters according to certain rules, and the speed of the conveyor belt is recycled to realize the online adaptive speed control of the conveyor belt.

[0050] Those skilled in the art can understand that all or part of the steps in the method of implementing the above embodiment can be instructed by a program to related hardware, and the corresponding program can be stored in a computer readable storage medium.

[0051] It should be noted that, although the method operations of the above-described embodiments are described in a particular, sequential order, this order is not meant to be a limitation and is not intended to imply that the operations be performed in that order, or that all of the operations be performed, to achieve desirable results. Rather, the steps can be performed in any order, or in some cases, simultaneously, as appropriate, to achieve desirable results.

[0052] In summary, the present application proposes that in the segmented combination conveyor system, by designing and installing a sensor system at the joint of the conveyor belt, the spacing of the material packages is detected by calculating the time of the material packages passing through, and the adaptive speed control of one segment of the segmented conveyor belt is realized according to the technical requirements through the control of the PLC, so as to achieve the purpose of widening the spacing of the material packages. At the same time, by designing the structure of the conveyor belt, the effect of preventing the material packages from slipping and shaping is achieved, so that the material conveying system can meet the requirements of the subsequent automatic equipment on the spacing of the material packages and the stability of the shape of the material packages. The adaptive speed regulation control system of the conveyor belt has simple structure and high technical portability, and can be widely used in the automatic speed regulation of different material package conveying systems.

[0053] The above only describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the scope disclosed by the present application, and such replacements or changes are also within the protection scope of the present application.

Claims

1. A method for adaptive speed control of a conveyor belt with increased spacing between material packages, characterized in that, The method includes: The preset time values ​​are T0 and T, where T is the control time for the minimum distance between material packages, T0 is the start detection time of the second sensor, and T0 is less than the time t2 for the material package to pass through the first sensor; The moment when the first sensor detects the material bag is recorded as moment 0. The signal of the first sensor changes from 0 to 1, and the counter starts counting. The first sensor is used to detect the material bag on the uniform speed conveyor belt. When the counter reaches T0, the second sensor starts detecting, and the counter continues counting; the second sensor is used to detect material packages on the variable speed conveyor belt; When the first sensor detects the moment the material package leaves, the signal of the first sensor changes from 1 to 0, and the counter continues to count for T seconds; Within the time interval (T0, t2+T), the second sensor continuously detects. If no material package is detected, the signal of the second sensor is 0, and the variable speed conveyor belt maintains its original speed. Otherwise, the signal of the second sensor becomes 1, and the variable speed conveyor belt decelerates or stops. When the counter reaches t2+T, the signals from the first and second sensors are reset, the counter is cleared, the variable speed conveyor belt resumes its original speed, the current detection process ends, and the preset time values ​​T0 and T are returned, waiting for the next round of detection.

2. The adaptive speed control method for increasing the spacing between material packages according to claim 1, characterized in that, The preset time value T is set to one or more parameters.

3. The adaptive speed control method for increasing the spacing between material packages according to claim 2, characterized in that, If the preset time value T is set to multiple parameters, then the number of times each parameter is used is set.

4. A conveyor belt adaptive speed control system with increased material bag spacing, to implement the conveyor belt adaptive speed control method according to any one of claims 1 to 3, characterized in that, The system includes a combined detection sensor, a PLC controller, a double-layer synchronous combined variable speed conveyor belt and a constant speed conveyor belt, and the PLC controller is connected to the combined detection sensor, the double-layer synchronous combined variable speed conveyor belt and the constant speed conveyor belt respectively. In this process, after the PLC controller receives the signal from the combined detection sensor, it compares and calculates the signal and sends a speed control signal to the components of the double-layer synchronous combined variable speed conveyor belt, so that the relative speed between the double-layer synchronous combined variable speed conveyor belt and the constant speed conveyor belt reaches the system's required speed.

5. The conveyor belt adaptive speed control system according to claim 4, characterized in that, The combined detection sensor includes a first sensor and a second sensor. The first sensor is installed on the frame of the uniform speed conveyor belt, and the second sensor is installed on the frame of the double-layer synchronous combined variable speed conveyor belt, maintaining a distance from the first sensor.

6. The conveyor belt adaptive speed control system according to claim 5, characterized in that, The distance between the first sensor and the second sensor is less than the sum of the length of one material package and the distance between the two material packages.

7. The conveyor belt adaptive speed control system according to claim 5, characterized in that, Both the first and second sensors are any type of sensor capable of detecting material packages, including gratings, photoelectric sensors, and optical fibers.

8. The conveyor belt adaptive speed control system according to any one of claims 4-7, characterized in that, The uniform speed conveyor belt is a motor-driven conveyor belt device of arbitrary structure. The motor speed is controlled by a frequency converter, which is controlled by a PLC.

9. The conveyor belt adaptive speed control system according to any one of claims 4-7, characterized in that, The double-layer synchronous combined variable speed conveyor belt is either a double-layer conveyor belt device with arbitrary synchronous speed regulation, or a single-layer conveyor belt device with any structure driven by a motor. The PLC synchronously controls the frequency converter to change the conveyor belt speed.

10. The conveyor belt adaptive speed control system according to claim 9, characterized in that, The double-layer conveyor belt device includes upper and lower conveyor belts, which clamp and move the material package.

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