Control method of pipe belt machine automatic speed regulating device and pipe belt machine automatic speed regulating device

Abstract

The application discloses a control method of a pipe belt machine automatic speed regulating device and the pipe belt machine automatic speed regulating device. The method comprises the following steps: obtaining the current belt speed of the pipe belt machine; obtaining the effective shaft power of the driving roller at this moment, wherein the effective shaft power is the power used by the pipe belt machine to transport materials at the current belt speed; calculating the current circumferential driving force of the pipe belt machine according to the effective shaft power; comparing the current circumferential driving force of the pipe belt machine at the current belt speed with the rated circumferential driving force of the pipe belt machine at the belt speed; in the case that the current circumferential driving force is less than the rated circumferential driving force, adjusting the belt speed of the pipe belt machine to the target belt speed, wherein the target belt speed refers to the belt speed of the pipe belt machine corresponding to the minimum motor power consumption under the premise that the pipe belt machine meets the transportation demand of the current transportation volume; and in the case that the current circumferential driving force is greater than or equal to the rated circumferential driving force, controlling the belt speed of the pipe belt machine to the rated belt speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe belt machine, in particular to a control method of an automatic speed regulating device of a pipe belt machine and the automatic speed regulating device of the pipe belt machine. BACKGROUND

[0002] The conventional pipe belt machine adopts a constant speed operation mode, that is, regardless of the amount of upstream material, the pipe belt machine always operates at a fixed speed and cannot automatically adjust the operating speed of the pipe belt machine according to the change of the load.

[0003] In addition, due to the filling rate limitation of the pipe belt machine, when the amount of upstream material suddenly increases, the pipe belt machine section will be blocked and the pipe will be expanded, and the conveying system will be forced to stop for troubleshooting.

[0004] Therefore, it is urgent to provide a technical solution to enable the pipe belt machine to automatically adjust the belt speed according to the load, while effectively avoiding the problem of pipe expansion. SUMMARY

[0005] An object of the present application is to provide a control method of an automatic speed regulating device of a pipe belt machine and a new technical solution of the automatic speed regulating device of the pipe belt machine, which can enable the pipe belt machine to automatically adjust the operating speed according to the load, while effectively avoiding the problem of pipe expansion by improving the control method of the automatic speed regulating device of the pipe belt machine.

[0006] In one aspect of the present application, a control method of an automatic speed regulating device of a pipe belt machine is provided, which comprises:

[0007] controlling the pipe belt machine to run with material;

[0008] obtaining the current belt speed of the pipe belt machine;

[0009] obtaining the invalid shaft power of the driving roller at this time, which is the shaft power of the driving roller used to move the belt alone at the current belt speed of the pipe belt machine;

[0010] obtaining the effective shaft power of the driving roller at the current belt speed according to the invalid shaft power, which is the power used to transport material alone at the current belt speed of the pipe belt machine;

[0011] calculating the current circumferential driving force of the pipe belt machine according to the effective shaft power;

[0012] comparing the current circumferential driving force of the pipe belt machine at the current belt speed with the rated circumferential driving force of the pipe belt machine at the belt speed, wherein the rated circumferential driving force refers to the driving force of the pipe belt machine corresponding to the current belt speed when the belt is fully loaded;

[0013] adjusting the belt speed of the pipe belt conveyor to a target belt speed, the target belt speed being a belt speed of the pipe belt conveyor corresponding to a minimum power consumption of the motor under the condition that the pipe belt conveyor meets the current material conveying requirement;

[0014] adjusting the belt speed of the pipe belt conveyor to a target belt speed, the target belt speed being a belt speed of the pipe belt conveyor corresponding to a minimum power consumption of the motor under the condition that the pipe belt conveyor meets the current material conveying requirement;

[0015] By the way in the embodiments of the present application, the optimal solution of the target belt speed is calculated by the effective shaft power of the driving roller. Thus, the motor can be adjusted to a reasonable belt speed according to the material conveying quantity of the pipe belt conveyor, and the power consumption of the motor is minimized, thereby saving energy.

[0016] Specifically, in the process of speed regulation of the pipe belt conveyor, first, the invalid shaft power of the driving roller of the pipe belt conveyor is calculated, that is, the shaft power of the driving roller for driving the belt to rotate alone is obtained under the condition that the pipe belt conveyor is in an empty load working condition. Then, the effective shaft power of the driving roller for transporting materials alone is calculated. Then, the current circumferential driving force is calculated according to the effective shaft power. Thus, the optimal rotating speed of the motor is selected according to the value of the current circumferential driving force, thereby not only enabling the belt speed of the pipe belt conveyor to change according to the change of the material conveying quantity of the pipe belt conveyor, but also avoiding the interference of the power of the driving roller for driving the belt alone by separately calculating the effective shaft power, thereby obtaining a more accurate target belt speed value.

[0017] In addition, when the material quantity of the pipe belt conveyor suddenly increases, the rotating speed of the motor is immediately increased to the rated rotating speed, and the belt speed of the pipe belt conveyor is increased to the rated belt speed. Thus, the belt speed of the pipe belt conveyor can be increased to the maximum value, thereby increasing the material conveying capacity of the pipe belt conveyor per unit time to effectively transport the excess materials, thereby effectively avoiding the pipe expansion of the pipe belt conveyor.

[0018] In another aspect of the present application, a pipe belt conveyor automatic speed regulation device is also provided, which comprises:

[0019] a driving force detection module for obtaining the shaft power of the driving roller of the pipe belt conveyor;

[0020] a controller in signal connection with the driving force detection module and the tension detection module.

[0021] Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description, serve to explain the principles of the present application.

[0023] Figure 1 Figure 1 is a partial structure diagram of a pipe belt machine automatic speed regulating device in an embodiment of the present application;

[0024] Figure 2 Figure 2 is an enlarged structure diagram of a driving roller part of Figure 1

[0025] Figure 3 Figure 3 is an enlarged structure diagram of a pipe belt machine receiving side of Figure 1

[0026] Figure 4 Figure 4 is a step diagram of a control method of a pipe belt machine automatic speed regulating device in an embodiment of the present application;

[0027] Figure 5 Figure 5 is a step of calculating a target belt speed in an embodiment of the present application;

[0028] Figure 6 Figure 6 is a step diagram of obtaining motor efficiency in an embodiment of the present application.

[0029] Explanation of reference signs:

[0030] 1, driving roller; 11, rotating shaft;

[0031] 2, driven roller;

[0032] 3, resistance adding module; 31, brake; 32, friction plate;

[0033] 4, tension detection module; 41, trigger part; 42, pressure sensor; 43, slide rail;

[0034] 5, rubber belt;

[0035] 6, machine frame. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the present application scheme, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0037] In some embodiments of the present application, a pipe belt machine automatic speed regulating device and a control method thereof are provided, and the pipe belt machine automatic speed regulating device is used to execute the control method. As shown in Figure 1 the pipe belt machine automatic speed regulating device includes a pipe belt machine body, the pipe belt machine body includes a motor, a roller assembly and a rubber belt 5 arranged on the roller assembly. The roller assembly includes a driving roller 1, and the rotating shaft 11 of the driving roller 1 is in transmission connection with the output end of the motor to drive the rubber belt 5 to run. The pipe belt machine automatic speed regulating device further includes a controller in signal connection with the motor and a driving force detection module in signal connection with the controller, and the driving force detection module is used to obtain the shaft power of the driving roller 1 of the pipe belt machine, for example, the driving force detection module is a strain gauge.​​

[0038] In some embodiments of the present application, referring to Figure 4 The present application also provides a control method for controlling the automatic speed regulation device of the pipe belt conveyor, which comprises the following steps:

[0039] Step 1: controlling the pipe belt conveyor to run with the belt speed;

[0040] Step 2: obtaining the current belt speed of the pipe belt conveyor;

[0041] Step 3: obtaining the invalid shaft power of the driving roller 1 at this time, which is the shaft power of the driving roller 1 for moving the rubber belt 5 alone;

[0042] Step 4: obtaining the effective shaft power of the driving roller 1 at this time according to the invalid shaft power, which is the power of the pipe belt conveyor for conveying materials alone at the current belt speed;

[0043] Step 5: calculating the current circumferential driving force of the pipe belt conveyor according to the effective shaft power;

[0044] Step 6: comparing the current circumferential driving force of the pipe belt conveyor at the current belt speed with the rated circumferential driving force of the pipe belt conveyor at the belt speed, wherein the rated circumferential driving force is the driving force of the pipe belt conveyor for conveying materials when the pipe belt conveyor is running at full load and the pipe belt conveyor is at the current belt speed;

[0045] Thus, it is determined whether the current amount of the pipe belt conveyor is greater than the rated amount of the pipe belt conveyor at the belt speed through this step.

[0046] Step 7: adjusting the rotating speed of the motor to the target belt speed in the case that the current circumferential driving force is less than the rated circumferential driving force, wherein the target belt speed refers to the belt speed of the pipe belt conveyor corresponding to the minimum power consumption of the motor under the premise that the belt speed of the pipe belt conveyor meets the transportation demand of the current amount;

[0047] That is to say, when the motor is at the target belt speed, the belt speed of the pipe belt conveyor can meet the demand of the current amount, and at the same time, the power of the motor is at the minimum value, so as to avoid the waste of energy.

[0048] Step 8: controlling the motor to regulate the speed to the rated rotating speed in the case that the current circumferential driving force is greater than or equal to the rated circumferential driving force.

[0049] In the above steps, the data of the effective shaft power and the rated circumferential driving force corresponding to different belt speeds when the pipe belt conveyor is at full load need to be collected first so as to facilitate the controller to obtain and compare later.

[0050] In the present application, the effective shaft power of the pipe belt conveyor is obtained by obtaining the invalid shaft power. In order to obtain the invalid shaft power of the driving drum 1 of the pipe belt conveyor, first, the pipe belt conveyor is run empty. The empty running refers to the state that the pipe belt conveyor is in the no-material running state. In the empty running state, the controller obtains the invalid shaft power {Pz1, Pz2, Pz3,...} of the driving drum 1 of the pipe belt conveyor at different belt speeds {V1, V2, V3,...} through the driving force detection module. The belt speed of the pipe belt conveyor refers to the speed of the rubber belt 5 running in the empty state. The shaft power refers to the power output from the motor to the rotating shaft 11 of the driving drum 1.

[0051] The method for controlling the pipe belt conveyor at different belt speeds {V1, V2, V3,...} is specifically: by controlling the rotating speed of the motor, the pipe belt conveyor is slowly speeded up from the initial belt speed to the set belt speed. In a specific example, the initial belt speed of the pipe belt conveyor is 0.5 m / s, which is an empirical initial value and is not limited to the present application, and the person skilled in the art can set it according to the needs.

[0052] The person skilled in the art can adjust the size of the set belt speed according to the needs of data collection. Generally, the set belt speed is the rated belt speed of the pipe belt conveyor, so that the invalid shaft power corresponding to different belt speeds between the initial belt speed and the rated belt speed of the pipe belt conveyor can be obtained. The corresponding information between the belt speed and the invalid shaft power of the pipe belt conveyor is saved in the controller to facilitate the controller to subsequently obtain the invalid shaft power according to the belt speed of the pipe belt conveyor or to obtain the belt speed of the pipe belt conveyor according to the invalid shaft power of the pipe belt conveyor.

[0053] In a specific embodiment, in order to collect the corresponding relationship between the belt speed and the invalid shaft power, the speed interval of the change of the belt speed of the pipe belt conveyor is 0.1 m / s. At the same time, the pipe belt conveyor is controlled to run at each belt speed for the same time, for example, the pipe belt conveyor is controlled to run at each belt speed for 10 s, so that the pipe belt conveyor is controlled to run at different belt speeds {V1, V2, V3,...}. Of course, the person skilled in the art can also adjust the speed change interval value of data collection.

[0054] In order to further improve the data collection step to improve the data comparison table of the controller, the pipe belt conveyor is further controlled to run with full load. Then the total power of the driving drum 1 at the above-mentioned belt speeds {V1, V2, V3,...} is collected through the strain gauge. Then the effective shaft power corresponding to different belt speeds of the pipe belt conveyor under the full load state is obtained by subtracting the invalid shaft power from the total power of the driving drum 1.

[0055] The rated circumferential driving force of the pipe belt conveyor is calculated according to the current effective shaft power. The rated circumferential driving force refers to the circumferential driving force of the pipe belt conveyor corresponding to the current belt speed under the full load.

[0056] Specifically, the circumferential driving force of the pipe belt conveyor is calculated according to the formula P=F*V. In the calculation of the above-mentioned rated circumferential driving force, V is equal to the belt speed, and P is equal to the effective shaft power of the pipe belt conveyor when the pipe belt conveyor is full of material at the belt speed.

[0057] According to the above-mentioned manner, the data table of the effective shaft power of the pipe belt conveyor corresponding to different belt speeds of the pipe belt conveyor when the pipe belt conveyor is full of material, the corresponding ineffective shaft power, and the rated circumferential driving force corresponding to each belt speed can be formed, so that the controller can obtain and compare in the process of forming the target belt speed.

[0058] The control method of the pipe belt conveyor in actual operation will be described below.

[0059] As shown in Figure 4 In the process of actual material operation of the pipe belt conveyor, the pipe belt conveyor is loaded. The controller obtains the belt speed of the pipe belt conveyor at the current load. Then the controller reads the ineffective shaft power corresponding to the pipe belt conveyor at the current belt speed.

[0060] Then, the total power of the driving roller 1 of the pipe belt conveyor at the current belt speed and the current load is collected by the strain gauge. The current effective shaft power is obtained by subtracting the read ineffective shaft power from the current total power.

[0061] Next, the current circumferential driving force of the pipe belt conveyor at the current load is calculated by the current effective shaft power. The current circumferential driving force is equal to the ratio between the current belt speed of the pipe belt conveyor and the current effective shaft power. Specifically, the circumferential driving force is calculated according to the power calculation formula P=F*V.

[0062] In the calculation of the current circumferential driving force, V is equal to the current belt speed of the pipe belt conveyor, and P is equal to the current effective shaft power of the pipe belt conveyor.

[0063] It can be understood that the effective shaft power of the pipe belt conveyor is in a positive relationship with the load of the pipe belt conveyor at each belt speed. That is, under the premise that the belt speed of the rubber belt 5 is constant, the effective power will increase or decrease corresponding to the increase or decrease of the material quantity.

[0064] When the load of the pipe belt conveyor increases at the current belt speed, the effective shaft power of the pipe belt conveyor increases correspondingly, and the current circumferential driving force of the pipe belt conveyor also increases correspondingly. Conversely, when the load of the pipe belt conveyor decreases at the current belt speed, the effective shaft power of the pipe belt conveyor decreases correspondingly, and the current circumferential driving force of the pipe belt conveyor also decreases correspondingly.

[0065] Then, the controller calculates the current circumferential driving force in real time and compares the size of the current circumferential driving force with the rated circumferential driving force.

[0066] If the current circumferential driving force is less than the rated circumferential driving force, the controller will initiate a speed regulation process for the conveyor belt. During the speed regulation process, the controller can select the target belt speed corresponding to the minimum power consumption of the motor based on the changes in the conveyor belt's transport capacity, and adjust the conveyor belt speed to the target speed.

[0067] If the current circumferential driving force is greater than or equal to the rated circumferential driving force, it indicates that the conveyor belt is already fully loaded or overloaded at the current belt speed. In this case, the belt speed of the conveyor belt should be increased to the rated belt speed to maximize the conveyor belt's capacity and effectively prevent pipe expansion.

[0068] During the process of adjusting the belt speed, the controller continues to collect the current circumferential driving force of the belt conveyor at the rated belt speed in real time until the current circumferential driving force is less than the rated circumferential driving force at the current belt speed, and then controls the belt conveyor to re-enter the aforementioned speed adjustment process.

[0069] The speed regulation process of the conveyor belt machine is explained in detail below.

[0070] In the speed regulation process, data collection is also required in advance to form a data comparison table for the controller to read.

[0071] In the speed regulation process, it is necessary to establish a data table of motor efficiency for each belt speed {V1,V2,V3...} of the belt conveyor. Motor efficiency refers to the ratio of the power output by the motor to the drive drum 1 to the input power of electrical energy.

[0072] like Figure 6 As shown, the method for establishing the motor efficiency data table for the conveyor belt at different belt speeds is as follows:

[0073] Step 71a: Control the application of the rated torque to the drive drum 1 of the conveyor belt to simulate the conveyor belt under rated load conditions, that is, to simulate the conveyor belt under full load conditions.

[0074] Step 71b: Obtain the power consumption of the motor and the total shaft power of the drive drum 1 at different belt speeds {V1, V2, V3...} of the conveyor belt;

[0075] Step 71c: Calculate the motor efficiency based on the ratio of the motor's power consumption to its total shaft power.

[0076] In the above process, the power consumption of the motor can be calculated by multiplying the motor's operating voltage and operating current. The motor's power consumption includes the power consumed in outputting to drive roller 1 and the wasted power due to its own reactance. The motor efficiency is calculated by the ratio of the total shaft power of drive roller 1 to the motor's power consumption at different belt speeds.

[0077] Specifically, in step 71a, in order to perform step 71a, as Figure 1 And Figure 2 shown, the pipe belt machine automatic speed regulating device further comprises a resistance adding module connected with the controller. The resistance adding module is used to apply a set braking torque to the pipe belt machine to simulate the working condition of the pipe belt machine running with material. Different T values can be used to simulate the size of the amount of material of the pipe belt machine.

[0078] For example, the resistance adding module comprises a friction plate 32 coaxially arranged with the rotating shaft 11 and a brake 31. The brake 31 is in the shape of a pincer, and the brake 31 is arranged across the two opposite surfaces of the friction plate 32 in the axial direction of the friction plate 32. When the controller issues a braking instruction, the brake 31 clamps the friction plate 32 to apply a set braking torque T to the rotating shaft 11 of the driving drum 1. The brake 31 can also adopt a disc type, drum type, etc., and the rated braking torque of the brake 31 is greater than the torque when the motor outputs full power.

[0079] In this step, the controller starts the resistance adding module, that is, the controller controls the brake 31 to apply a rated braking torque to the driving drum 1. The speed interval of the speed regulation of the control motor is also 0.1 m / s. The controller obtains the corresponding motor consumption power {Px1, Px2, Px3…} and the shaft power of the driving drum 1 {Py1, Py2, Py3…} when the motor is at different rotating speeds {n1, n2, n3…}. It can be understood that there is a fixed conversion relationship between the rotating speed of the motor and the belt speed of the pipe belt machine, so that the rotating speed of the motor can be obtained to correspond to the different belt speeds of the pipe belt machine.

[0080] Then, the motor efficiency {η1, η2, η3…} is calculated according to the formula η=Py / Px. The motor efficiency forms a curve. Thus, the motor efficiency values of the pipe belt machine at different belt speeds are established, and the data collection table is pre-stored in the controller for the convenience of the controller reading, and the corresponding motor consumption power values at different rotating speeds are also established, so as to facilitate the controller reading.

[0081] Next, the speed regulating process of the pipe belt machine is described through specific embodiments.

[0082] As shown in Figure 5 , the way of obtaining the target belt speed of the pipe belt machine includes:

[0083] calculating the boundary belt speed value of the current running amount;

[0084] reading the invalid shaft power, the effective shaft power and the motor efficiency corresponding to different belt speed values in the interval of the current belt speed value and the boundary belt speed value to calculate the corresponding selectable motor consumption power;

[0085] The minimum value of the motor power consumption in the range of the selectable motor power consumption is selected as the target belt speed of the pipe belt conveyor.

[0086] Embodiment One

[0087] In this embodiment, the current circumferential driving force of the pipe belt conveyor is reduced as an example. The controller calculates the current circumferential driving force of the pipe belt conveyor in real time, which is reduced from the F1 value under the first belt speed Vd1 at the first time to the F2 value at the second time. That is, the conveying capacity of the pipe belt conveyor at the second time is less than that at the first time.

[0088] According to the principle of momentum conservation:

[0089] Vd1* rated circumferential driving force = F2* boundary belt speed (at this time, F2 < F1 < rated circumferential driving force). The boundary belt speed is the minimum belt speed of the pipe belt conveyor corresponding to the conveying capacity at the second time when the current circumferential driving force of the pipe belt conveyor is F2. That is, the controller can reduce the belt speed of the pipe belt conveyor from the first belt speed Vd1 at the first time, but the belt speed of the pipe belt conveyor cannot be reduced to less than the boundary belt speed. That is, the belt speed adjustment range of the pipe belt conveyor is Vd1 to the boundary belt speed.

[0090] The controller reads the invalid shaft power and the effective shaft power of different belt speeds in the range of Vd1 to the boundary belt speed by reading the above-mentioned pre-stored data. Thus, the motor power consumption corresponding to different belt speeds in the range of Vd1 to the boundary belt speed is read out. The controller compares the motor power consumptions to select the belt speed value corresponding to the minimum motor power consumption as the target belt speed. Then, according to the relationship between the belt speed of the pipe belt conveyor and the motor speed, the belt speed of the pipe belt conveyor is adjusted by controlling the motor speed.

[0091] When the conveying capacity of the pipe belt conveyor changes, the current circumferential driving force of the pipe belt conveyor decreases. Thus, the controller can correspondingly obtain the target belt speed of the motor according to the current circumferential driving force of the pipe belt conveyor, and adjust the belt speed of the pipe belt conveyor to the target belt speed.

[0092] Embodiment Two

[0093] On the contrary, if the current circumferential driving force of the pipe belt conveyor calculated by the controller increases, that is, the current circumferential driving force of the pipe belt conveyor is increased from the F1 value under the first belt speed Vd1 at the first time to the F2 value at the second time. That is, the conveying capacity of the pipe belt conveyor at the second time is greater than that at the first time, and at the same time, F2 is less than the rated circumferential driving force, the controller still controls the pipe belt conveyor to execute the speed regulation process.

[0094] Similarly, according to the principle of momentum conservation:

[0095] Vd1* rated circumferential driving force = F2* boundary belt speed (at this time, F1 < F2 < rated circumferential driving force). In the embodiment, the boundary belt speed is the highest belt speed of the pipe belt conveyor corresponding to the second time when the current circumferential driving force of the pipe belt conveyor is F2. That is, at this time, the controller can increase the belt speed of the pipe belt conveyor from the first belt speed Vd1 at the first time. Different from the previous embodiment, in the case of an increase in the amount of material, the controller can calculate the boundary belt speed, or directly take the rated belt speed of the pipe belt conveyor as the boundary belt speed.

[0096] That is, the belt speed adjustment range of the pipe belt conveyor is Vd1 to the boundary belt speed (or the rated belt speed). The controller reads the invalid shaft power and the effective shaft power of different belt speeds in the range of Vd1 to the boundary belt speed (or the rated belt speed) by reading the pre-stored data. Thus, the motor consumption power corresponding to different belt speeds in the range of Vd1 to the boundary belt speed (or the rated belt speed) is read out.

[0097] The controller compares the motor consumption powers, and selects the belt speed value corresponding to the minimum motor consumption power as the target belt speed. Then, according to the relationship between the belt speed of the pipe belt conveyor and the motor speed, the belt speed of the pipe belt conveyor is adjusted by controlling the motor speed.

[0098] Through the above-mentioned embodiments, since the effective shaft power and the invalid shaft power of the driving drum 1 are distinguished, the circumferential driving force of the pipe belt conveyor driving the current amount of material can be calculated according to the effective shaft power of the driving drum 1. The current circumferential driving force is compared with the rated circumferential driving force. If the current circumferential driving force is less than the rated circumferential driving force, it proves that the pipe belt conveyor is not currently fully loaded, at which time the speed regulation process is started, and the belt speed of the pipe belt conveyor is adjusted to the target belt speed.

[0099] The target belt speed refers to the belt speed of the pipe belt conveyor corresponding to the minimum motor consumption power under the premise that the motor meets the transportation demand of the current amount of material. Thus, the energy can be saved to the maximum extent on the basis of meeting the transportation of the material.

[0100] If the current circumferential driving force is greater than or equal to the rated circumferential driving force, at this time, it proves that the amount of material transported by the pipe belt conveyor is greater than the amount of material when the pipe belt conveyor is fully loaded, at which time the pipe belt conveyor is prone to pipe expansion. At this time, the pipe belt conveyor anti-expansion process needs to be started to increase the motor speed to the maximum, thereby increasing the carrying capacity of the pipe belt conveyor and effectively avoiding the pipe expansion of the pipe belt conveyor.

[0101] Embodiment Three

[0102] In this embodiment, the anti-expansion process of the pipe belt conveyor is described.

[0103] In this embodiment, the control method of the automatic speed regulation device of the pipe belt conveyor further comprises:

[0104] With reference to the above Figure 4 In the case where the current circumferential driving force is greater than or equal to the rated circumferential driving force, the control method further comprises:

[0105] Step 81: Obtain the current belt 5 tension value, which is the tension value of the belt 5 at the receiving side of the pipe belt machine, which is located on the side where the driven roller is located;

[0106] Step 82: Compare the current belt 5 tension value with the belt 5 standard tension value, which is the tension value of the belt 5 at the receiving side when the pipe belt machine is in full load working condition and the pipe belt machine is at the rated belt speed;

[0107] Step 83: In the case where the current belt 5 tension value is greater than or equal to the set threshold range of the belt 5 standard tension value, adjust the motor speed to the rated speed;

[0108] Step 84: When the current tension value of the belt 5 is less than the set threshold range of the belt 5 standard tension value, adjust the pipe belt machine to the target belt speed.

[0109] In this embodiment, the receiving side refers to the side where the belt 5 is loaded, and the receiving side of the belt 5 is the side of the belt 5 away from the driving roller 1. When the material falls onto the receiving side of the belt 5, it will cause the belt 5 to deform, thereby generating the current tension value of the belt 5. By comparing the current tension value of the belt 5 with the standard tension value, it is determined whether the amount of material on the receiving side of the belt 5 exceeds the actual amount of material transported by the pipe belt machine. Therefore, when the actual tension value of the belt 5 is greater than the standard tension value of the belt 5, it proves that the amount of material on the receiving side of the belt 5 exceeds the rated value, so that the pipe belt machine is prone to pipe expansion.

[0110] In actual use, first, the current circumferential driving force and the rated circumferential driving force are calculated according to the effective shaft power of the driving roller 1. When the current circumferential driving force is greater than or equal to the rated circumferential driving force, the current tension and the standard tension of the belt 5 at the receiving side are compared. If the current tension is greater than or equal to the standard tension, the motor speed is controlled to increase to the rated speed; otherwise, if it is less than the standard tension, the pipe belt machine is controlled to work at the target belt speed.

[0111] Since the driving roller 1 and the receiving side are away from each other, by judging whether the material exceeds the rated amount at the receiving side of the belt 5, compared with the method of simply using the effective shaft power of the driving roller 1 to calculate the current circumferential driving force to judge the amount of material, it can more sensitively and accurately judge whether the material exceeds the rated amount, and more sensitively reflect that the amount of material meets the rated amount, so as to quickly adjust the motor speed from the rated speed to the target belt speed.

[0112] The standard tension value of the belt 5 refers to the standard tension value of the belt 5 at the material receiving side of the pipe belt conveyor under full load condition. Within the range, the pipe belt conveyor has a reasonable conveying capacity and does not expand the pipe. In addition, it can be understood that when the motor is accelerated to the rated speed, the pipe belt conveyor also has a rated belt speed, that is, the belt speed of the pipe belt conveyor is increased to the rated belt speed value.

[0113] To perform the method in the embodiment, refer to Figure 1 and Figure 3 The pipe belt conveyor automatic speed regulating device further comprises a tension detection module 4 connected with the controller. The drum assembly comprises a driving drum 1 and a driven drum 2, and the belt 5 is sleeved on the driving drum 1 and the driven drum 2. The driven drum 2 is arranged at the material receiving side of the pipe belt conveyor.

[0114] The tension detection module 4 is used to detect the tension of the belt 5 at the material receiving side of the pipe belt conveyor. Specifically, the tension detection module 4 comprises a pressure sensor 42 and a trigger part 41 matched with the pressure sensor 42. The driven drum 2 is slidingly connected with a slide rail 43, and the slide rail 43 is arranged on or integrated with the rack 6. The driven drum 2 can slide in the running direction of the belt 5 under the action of the tension of the belt 5. The trigger part 41 is arranged on the driven drum 2, so that the driven drum 2 can apply different pressures to the pressure sensor 42 during the sliding process in the running direction of the belt 5 to generate the current tension value of the belt 5.

[0115] In a specific example, if the amount of incoming material at the material receiving side of the pipe belt conveyor is large, the tension of the belt 5 at the material receiving side of the pipe belt conveyor increases. When the tension of the belt 5 increases, the driven drum 2 can be driven to slide towards the pressure sensor 42, so that the trigger part 41 presses the pressure sensor 42. The larger the amount of incoming material, the greater the tension of the belt 5, and the greater the pressure applied by the trigger part 41 to the pressure sensor 42, that is, the greater the current tension value of the belt 5 obtained by the controller. Conversely, the smaller the pressure applied by the trigger part 41 to the pressure sensor 42, the smaller the current tension value of the belt 5 obtained by the controller.

[0116] When the current tension value of the belt 5 increases to the set threshold range of the standard tension value of the belt 5, in order to avoid pipe expansion of the pipe belt conveyor, the controller controls the motor speed to increase to the rated speed, so that the belt speed of the pipe belt conveyor is increased until the current tension value of the belt 5 decreases to less than the set threshold range of the standard tension value of the belt 5, and then the motor speed is adjusted to

[0117] When the current tension value of the belt 5 decreases to less than the set threshold range of the standard tension value of the belt 5, the controller only adjusts the belt speed of the pipe belt conveyor to the target belt speed.

[0118] The set threshold range of the standard tension value of the adhesive tape 5 can be 1.05 times the standard tension value of the adhesive tape 5. The set threshold range of the standard tension value of the adhesive tape 5 can be adjusted by the person skilled in the art as needed.

[0119] By adopting the manner in the embodiment, the optimal solution of the target belt speed is calculated by the effective shaft power of the driving roller 1. Thus, the motor can have a reasonable rotating speed according to the amount of material transported by the pipe belt machine, and the motor consumes the lowest power, thereby saving energy.

[0120] Specifically, in the process of speed regulation of the pipe belt machine, first, the invalid shaft power of the driving roller 1 of the pipe belt machine is calculated, that is, the power of the driving roller 1 alone driving the adhesive tape 5 to rotate is obtained when the pipe belt machine is in the no-load working condition. Then, the effective shaft power of the driving roller 1 alone for transporting material is calculated. Then, the current circumferential driving force of transporting different amounts of material is calculated according to the effective shaft power. Thus, the optimal rotating speed of the motor is selected according to the value of the current circumferential driving force, thereby not only enabling the rotating speed of the motor to change according to the amount of material, but also avoiding the interference of the running power of the driving roller 1 with the adhesive tape, thereby obtaining a more accurate target belt speed.

[0121] In addition, the embodiment of the present application can be used for the characteristics of the pipe belt machine that the pipe belt machine is prone to pipe expansion. The tension detection module 4 is arranged in the speed regulation system of the pipe belt machine to detect the current tension value of the adhesive tape 5 on the material receiving side of the pipe belt machine in real time. Thus, when the amount of incoming material on the material receiving side of the pipe belt machine suddenly increases, the rotating speed of the motor is immediately increased to the rated rotating speed, thereby increasing the operating speed of the pipe belt machine to the rated speed. Thus, the material transporting speed of the pipe belt machine can be increased, thereby increasing the material transporting capacity of the pipe belt machine per unit time to effectively transport the excess material, thereby effectively avoiding the pipe expansion of the pipe belt machine.

[0122] The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that the person skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A control method for an automatic speed regulating device for a conveyor belt machine, characterized in that, The conveyor belt machine includes a drive roller connected to a motor drive, and a belt sleeved on the drive roller. The control method includes: Control the material transport operation of the conveyor belt; Get the current belt speed of the conveyor belt; Obtain the ineffective shaft power of the drive roller at this time. The ineffective shaft power is the shaft power of the drive roller used solely to drive the conveyor belt at the current belt speed of the conveyor belt. Based on the invalid shaft power, the current effective shaft power of the drive drum is obtained. The effective shaft power is the power of the belt conveyor used solely for conveying materials at the current belt speed. Calculate the current circumferential driving force of the conveyor belt based on the effective shaft power; Compare the current circumferential driving force of the tubular belt conveyor at the current belt speed with the rated circumferential driving force of the tubular belt conveyor at the current belt speed, wherein the rated circumferential driving force refers to the driving force of the tubular belt conveyor when fully loaded with material at the current belt speed. When the current circumferential driving force is less than the rated circumferential driving force, the belt speed of the conveyor belt is adjusted to the target belt speed. The target belt speed refers to the belt speed of the conveyor belt at the minimum power consumption of the motor under the premise that the conveyor belt meets the current transport volume requirements. When the current circumferential driving force is greater than or equal to the rated circumferential driving force, control the belt speed of the conveyor belt to the rated belt speed; In order to obtain the ineffective shaft power of the conveyor belt drive drum, the conveyor belt is run under no-load conditions. No-load operation means that the conveyor belt is in a state of running without material. In the no-load operation state, the controller obtains the ineffective shaft power {Pz1, Pz2, Pz3, ……} of the drive drum when the conveyor belt is at different belt speeds {V1, V2, V3, ……} through the drive force detection module. The steps to obtain the target belt speed are as follows: Calculate the boundary speed of the current transport volume; Read the ineffective shaft power, effective shaft power, and motor efficiency corresponding to different belt speeds within the range of the current belt speed and the boundary belt speed, and calculate the motor power consumption corresponding to different belt speeds as the selectable motor power consumption. The belt speed of the conveyor corresponding to the minimum value among the multiple selectable motor power consumption ranges is selected as the target belt speed. The motor efficiency is obtained in the following way: The drive roller is controlled to have a rated braking torque to simulate the conveyor belt under full load conditions; Control the motor to operate at different speeds; Obtain the power consumption of the motor and the total shaft power of the drive roller at different motor speeds; The motor efficiency is calculated based on the ratio of the total shaft power to the power consumed, corresponding to different rotational speeds.

2. The control method of the automatic speed regulating device for a conveyor belt machine according to claim 1, characterized in that, When the current circumferential driving force is greater than or equal to the rated circumferential driving force, the control method further includes: The current tension value of the conveyor belt is obtained. The current tension value of the conveyor belt is the tension value of the conveyor belt at the receiving side of the conveyor belt machine. The receiving side is located on the side of the conveyor belt away from the drive roller. The current tension value of the tape is compared with the standard tension value of the tape, which is the tension value of the tape on the receiving side when the conveyor belt is under full load and at the current belt speed. If the current belt tension value is greater than or equal to the set threshold range of the standard belt tension value, adjust the conveyor belt speed to the rated belt speed. When the current tension value of the tape is less than the set threshold range of the standard tension value of the tape, adjust the conveyor belt speed to the target speed.

3. The control method of the automatic speed regulating device for a conveyor belt machine according to claim 1, characterized in that, The boundary band velocity is calculated using the following formula: Current belt speed * rated circumferential driving force = current circumferential driving force * boundary belt speed.

4. The control method of the automatic speed regulating device for a conveyor belt according to any one of claims 1-3, characterized in that, The current circumferential driving force is equal to the ratio between the current belt speed of the conveyor and the current effective shaft power.

5. The control method of the automatic speed regulating device for a conveyor belt according to any one of claims 1-3, characterized in that, The methods for obtaining the rated circumferential driving force include: Obtain the effective shaft power of the drive drum when the conveyor is under full load at the current belt speed; The rated circumferential driving force is equal to the ratio between the current belt speed and the current effective shaft power.

6. An automatic speed control device for a conveyor belt machine, characterized in that, A control method for implementing the automatic speed control device for a conveyor belt as described in any one of claims 1-5, wherein the automatic speed control device for the conveyor belt comprises: The tension detection module is used to obtain the current tension value of the conveyor belt on the receiving side of the conveyor belt machine; The drive force detection module is used to obtain the shaft power of the drive drum of the conveyor belt machine; The controller is signal-connected to the driving force detection module and the tension detection module.

7. The automatic speed regulating device for a conveyor belt according to claim 6, characterized in that, The receiving side of the conveyor belt machine is located on the side where the driven roller is located; The automatic speed control device also includes a driven roller and a slide rail, wherein the driven roller is slidably connected to the slide rail; The tension detection module includes a pressure sensor and a trigger unit adapted to the pressure sensor, the trigger unit being disposed on the driven roller; The driven roller can slide along the running direction of the conveyor belt under the action of the belt tension to drive the trigger part to apply different pressures to the pressure sensor to generate the current tension value of the conveyor belt.

8. The automatic speed control device for a conveyor belt according to claim 7, characterized in that, It also includes a resistance booster module, which is connected to the controller signal and is used to apply braking torque to the drive roller.

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