阅读说明：本技术 一种皮带打滑检测装置以及检测方法 (Belt slip detection device and detection method ) 是由 丁海泉 于 2020-06-05 设计创作，主要内容包括：本发明涉及一种皮带打滑检测装置,所述检测装置包括从滚筒测速器、动力滚筒测速器、动力滚筒调速装置和控制系统；从滚筒测速器通过柔性联轴器直接安装在从滚筒的运行中心轴上,编码器通过信号电缆将测得的从滚筒转速Va发给控制系统,动力滚筒测速器通过联轴器直接安装在动力滚筒的运行中心轴上,将测得的动力滚筒转速Vb发给控制系统；该方案解决了目前皮带输送机常遇到了因皮带打滑和积料导致的生产中断问题。(The invention relates to a belt slippage detection device, which comprises a slave roller velometer, a power roller speed regulation device and a control system, wherein the slave roller velometer is connected with the power roller speed regulation device; the slave drum velometer is directly arranged on the running central shaft of the slave drum through a flexible coupler, the encoder sends the measured slave drum rotating speed Va to the control system through a signal cable, the power drum velometer is directly arranged on the running central shaft of the power drum through the coupler, and the measured power drum rotating speed Vb is sent to the control system; the scheme solves the problem that the existing belt conveyor frequently encounters production interruption caused by belt slipping and material accumulation.)

1. The utility model provides a belt detection device that skids, its characterized in that, detection device includes from cylinder velometer, power cylinder speed adjusting device and control system, passes through flexible shaft coupling direct mount from the cylinder velometer on the operation center pin of cylinder, and the encoder sends the control system to the cylinder rotational speed Va that will record through signal cable, and the power cylinder velometer passes through the shaft coupling direct mount on the operation center pin of power cylinder, sends the power cylinder rotational speed Vb that will measure to control system.

2. A method of detecting belt slippage using the detection device of claim 1, said method comprising the steps of:

step 1: the control system directly collects the rotating speeds Va and Vb which can reflect the running condition of the drum through the encoders respectively arranged on the secondary drum and the power drum, the radius of the secondary drum is determined to be ra, the radius of the power drum is determined to be rb, and then the control system can respectively calculate the theoretical linear speeds of the secondary drum and the power drum to be 2 pi raVa and 2 pi rb Vb;

step 2: in the case of no belt slip, the ratio of Va and Vb from the drum and power drum linear speed is constant regardless of changes in Va and Vb, and the ratio P0 of 2 pi raVa and 2 pi rbVb is calculated as 2 pi raVa/2 pi rbVb as raVa/rbVb as the standard ratio;

and step 3: in the process of belt production and operation, the control system calculates the actual ratio P1 of 2 pi raVa to 2 pi rbVb in real time to be raVa1/rbVb1, and takes P1 and P0 as comparison, if the absolute value isIf the belt slip exceeds the set range by more than 0.02, the belt can be judged to slip;

and 4, step 4: the belt is eliminated after slipping.

3. The method of claim 2, wherein the step 4 is as follows:

step 4-1: in thatWhen the speed of the output line of the power roller is higher than the actual running speed of the belt, the control system can automatically judge that the speed of the output line of the power roller is higher than the actual running speed of the belt, and the belt slips on the power roller side of the belt;

step 4-2: the control system immediately adjusts the output rotating speed of the power roller to ensure that the output linear speed of the power roller is consistent with the linear speed of the secondary drum, namely to ensure that the value of P1 is restored to P0 as soon as possible, and concretely does soThe law is to ensure that P1-P0 is achieved, i.e.Where Va1 and Vb1 are the current rotational speeds from the drum and the powered drum, respectively, it is possible to obtain:namely, the real-time output rotating speed of the power roller needs to be adjusted as follows:

step 4-3: if the rolling speed of the power is adjusted,if the friction force between the belt and the power roller is not reduced below the preset value, the friction force is judged to be reduced because the belt is loaded or the mechanical structure between the power roller and the belt is in problem, and the control system sends out an alarm or stop signal to avoid abnormal continuation.

Technical Field

The invention relates to a detection device, in particular to a belt slippage detection device, and belongs to the technical field of electrical equipment control.

Background

Belt conveyors are used in a large number of industrial production environments for transferring material from one location to another via one or more belts. The belt conveyor usually comprises a power roller driven by a hydraulic coupler or a speed reducer, a belt and a driven roller driven by belt friction force, wherein the belt friction thermal wear is aggravated due to the belt slip problem caused by different power sources of the power roller and the driven roller, the abnormal accumulation of materials is also caused, the belt is started by the materials accumulated on the belt under the condition of not timely cleaning, the belt starting current is high, the slip phenomenon is more prone to occur, and the difficulty is caused for the subsequent belt to recover to run. In a material conveying system consisting of a plurality of belts, the material accumulation of the belts is caused by two reasons: 1. the belt stop time is in a coordinated error, namely the belt stops running under the condition that the upstream belt does not stop feeding or the belt has materials, so that the belt is accumulated; 2. the belt slips to cause the material to be unable to be carried out in time and to lead to long-pending material. Therefore, a new solution to solve the above technical problems is urgently needed.

Disclosure of Invention

The invention provides a belt slippage detection device aiming at the problems in the prior art, and the technical scheme is characterized in that the slippage detection device is used for identifying the occurrence of belt slippage, and the slippage phenomenon of a belt is eliminated by a control method, so that the material accumulation on the belt is reduced.

In order to achieve the purpose, the technical scheme of the invention is that the belt slip detection device is characterized by comprising a slave drum velometer 4, a power drum velometer, a power drum speed regulation device and a control system, wherein the slave drum velometer is directly installed on a running central shaft of a slave drum through a flexible coupling; under the condition that the belt normally runs (the phenomenon of no slipping can be confirmed manually under the condition that the belt is lightly loaded and has no material), the ratio of Va to Vb is constant, and under the condition that the belt slips, the ratio of Va to Vb is changed, so that the control system can use the change of the ratio of Va to Vb as the basis for judging the slipping, and adjust the output speed of the power roller speed regulating device 6 through a control algorithm to eliminate the slipping. The speed regulating device of the power regulating roller receives a speed regulating signal from the control system, and drives the power regulating roller to start, stop and regulate the speed through a transmission device such as a speed reducer motor and the like, so that the anti-slip and anti-accumulation functions of the belt are finally realized.

A method of detecting belt slippage, said method comprising the steps of:

step 1: the control system directly collects the rotating speeds Va and Vb which can reflect the running condition of the drum through the encoders respectively arranged on the secondary drum and the power drum, the radius of the secondary drum is determined to be ra, the radius of the power drum is determined to be rb, and then the control system can respectively calculate the theoretical linear speeds of the secondary drum and the power drum to be 2 pi raVa and 2 pi rb Vb;

step 2: in the case of no belt slip, the ratio of linear speed from the drum to the power drum is constant regardless of changes in Va and Vb, and the ratio P0 of 2 pi raVa to 2 pi rbVb is calculated as 2 pi raVa/2 pi rbVb as raVa/rbVb as the standard ratio;

and step 3: in the process of belt production and operation, the control system calculates the actual ratio P1 of 2 pi raVa to 2 pi rbVb in real time to be raVa1/rbVb1, and takes P1 and P0 as comparison, if the absolute value isIf the belt slip exceeds the set range of 0.02 (can be adjusted according to actual working conditions), the belt can be judged to slip;

and 4, step 4: and adjusting and eliminating after the belt slips.

As an improvement of the present invention, the step 4 specifically includes the following steps:

automatically adjusting the number of output revolutions of the power drum by comparing the belt linear velocity measured from the drum encoder with the belt linear velocity measured from the power drum encoder with the reference:

step 4-1: in thatWhen the output speed of the power roller is higher than the actual running speed of the belt, the control system can automatically judge that the output line speed of the power roller is higher than the actual running speed of the belt, and the belt slips on the power roller side of the belt;

step 4-2: the control system immediately adjusts the output speed of the power roller to ensure that the output linear speed of the power roller is consistent with the linear speed of the slave roller, namely to ensure that the value of P1 is restored to P0 as soon as possible, namely to ensure that P1 is equal to P0, namely to ensure that P0 is realizedWhere Va1 and Vb1 are the current rotational speeds from the drum and the powered drum, respectively, it is possible to obtain:namely, the real-time output rotating speed of the power roller needs to be adjusted as follows:

step 4-3: if the rolling speed of the power is adjusted,if the friction force between the belt and the power roller is not reduced below the preset value, the friction force is judged to be reduced because the belt is loaded or the mechanical structure between the power roller and the belt is in problem, and the control system sends out an alarm or stop signal to avoid abnormal continuation.

Compared with the prior art, the invention has the advantages that 1) the technical scheme takes the rotation speed of the secondary roller as the operation basis, and the actual linear speed of the belt is accurately calculated; 2) the slipping state of the belt can be automatically detected and judged by comparing the rotating speed ratio of the slave roller and the power roller; 3) the slipping phenomenon is eliminated in time by dynamically adjusting the speed of the power roller; 4) the scheme designs a method for dynamically adjusting the speed of the power roller, and the speed of the belt is ensured to be controllable; 5) the occurrence of belt material accumulation is avoided by eliminating the slipping phenomenon; 6) a method for controlling the stop time of the belt is designed, the start-up idle time of the belt is reduced, and the occurrence of material accumulation is avoided.

Drawings

FIG. 1 is a view showing a mounting structure of a drum tachometer (front view and side view);

FIG. 2 is a view showing the structure of a belt antiskid device;

FIG. 3 is a schematic illustration of a material handling system;

wherein 1, the belt is arranged; 2-a power roller; 3-a slave cylinder; 4-slave cylinder velometer; 5-power roller velometer; 6-power roller speed adjusting device, 7-flexible coupling, 8-encoder signal cable and 9-encoder fixing support.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: referring to fig. 1, a belt slip detection device comprises a slave drum speed measurer 4, a power drum speed measurer 5, a power drum speed regulating device 6 and a control system, wherein the slave drum speed measurer 4 is directly installed on a running central shaft of a slave drum through a flexible coupling, the mechanical installation structure is as shown in fig. 1, an encoder sends a measured slave drum rotating speed Va to the control system through a signal cable, the power drum speed measurer 5 is directly installed on the running central shaft of a power drum through the coupling, and the measured power drum rotating speed Vb is sent to the control system; under the condition that the belt normally runs (the phenomenon of no slipping can be confirmed manually under the condition that the belt is lightly loaded and has no material), the ratio of Va to Vb is constant, and under the condition that the belt slips, the ratio of Va to Vb is changed, so that the control system can use the change of the ratio of Va to Vb as the basis for judging the slipping, and the output speed of the power roller speed regulating device 6 is regulated through a control algorithm to eliminate the slipping. The adjusting power roller speed adjusting device 6 receives a speed adjusting signal from the control system, and drives the power roller to start, stop and adjust the speed through a transmission device such as a speed reducer motor, and the like, so that the anti-slip and anti-accumulation functions of the belt are finally realized.

Example 2: referring to fig. 1, a method of detecting belt slippage, the method comprising the steps of:

step 1: the control system directly collects the rotating speeds Va and Vb which can reflect the running condition of the drum through the encoders respectively arranged on the secondary drum and the power drum, the radius of the secondary drum is determined to be ra, the radius of the power drum is determined to be rb, and then the control system can respectively calculate the theoretical linear speeds of the secondary drum and the power drum to be 2 pi raVa and 2 pi rb Vb;

step 2: in the case of no belt slip, the ratio of linear speed from the drum to the power drum is constant regardless of changes in Va and Vb, and the ratio P0 of 2 pi raVa to 2 pi rbVb is calculated as 2 pi raVa/2 pi rbVb as raVa/rbVb as the standard ratio;

and step 3: in the process of belt production and operation, the control system calculates the actual ratio P1 of 2 pi raVa to 2 pi rbVb in real time, namely raVa1/rbVb1, and takes P1 and P0 as comparison, if the actual ratio is absolutely equal to the ratio P1/rbVb 1To the valueIf the belt slip exceeds the set range of 0.02 (can be adjusted according to actual working conditions), the belt can be judged to slip;

and 4, step 4: the belt is eliminated after slipping.

As an improvement of the present invention, the step 4 specifically includes the following steps:

automatically adjusting the number of output revolutions of the power drum by comparing the belt linear velocity measured from the drum encoder with the belt linear velocity measured from the power drum encoder with the reference:

step 4-1: in thatWhen the output speed of the power roller is higher than the actual running speed of the belt, the control system can automatically judge that the output line speed of the power roller is higher than the actual running speed of the belt, and the belt slips on the power roller side of the belt;

step 4-2: the control system immediately adjusts the output speed of the power roller to ensure that the output linear speed of the power roller is consistent with the linear speed of the slave roller, namely to ensure that the value of P1 is restored to P0 as soon as possible, namely to ensure that P1 is equal to P0, namely to ensure that P0 is realizedWhere Va1 and Vb1 are the current rotational speeds from the drum and the powered drum, respectively, it is possible to obtain:namely, the real-time output rotating speed of the power roller needs to be adjusted as follows:

step 4-3: if the rolling speed of the power is adjusted,if the value is not reduced below the preset value, the value is judged to be the belt and the power rollerThe friction is reduced because of the problem of the belt load or the mechanical structure of the power roller and the belt, and the control system sends out an alarm or stop signal to avoid abnormal continuation.

In order to avoid the problem that the belt is accumulated due to errors or slippage in the forward and stop time, when the material needs to be conveyed in a complete material transfer system (comprising a storage bin), the belt which is farthest away from the storage bin is firstly opened, the belt … … which is next farthest away can be opened in a linkage manner after the belt which is farthest away is confirmed to be opened, and the like, until the material comes out of the storage bin, and a material flow schematic diagram is shown in fig. 3. The technology measures and calculates the material conveying time of the belt according to the slave roller running linear speed of all the belts on the premise of realizing the measurable and controllable running speed of the belt, confirms the downtime of each belt through the accurate measurement and calculation of the material position on the belt, and avoids the problem that the belt generates material accumulation due to the error of the smooth stopping time or the slippage and reduces the waste of electric energy. Assuming a first belt length of L1, running speed Va1 from drum radius r 1; assuming that the second belt length L2, from the radius r2 of the drum, and the running speed Va2 … …, the control system calculates the time it takes for the first belt to empty its contents when the entire transfer system is shut down, from the time the hopper gate is closedTime taken for the second belt to empty its contents… … time taken for the last belt to empty its contents Therefore, when the belt system stops, after the control system closes the feeding valve, the material can be completely moved out of the material transfer system as long as t1 time for the first belt to operate again, t2 time for the second belt to operate again and tn time for the nth belt to operate. When a certain belt slips and possibly accumulates materials, the control system can control the blanking speed of a hopper and reduce the load of the belt, and also takes the rotating speed Va of a driven roller of the belt as a reference, and the control system can quickly regulate the output speed of the driven roller of the belt to ensure that P1 is P0, so that the slip fault is timely eliminated, the control system can be ensured to track the actual position of the materials on the whole belt system, and the continuous operation time of a downstream belt is adjusted, thereby achieving the purpose of eliminating the accumulated materials.

The working principle and the process are as follows: referring to fig. 1 and 2, a drum velometer is manufactured and respectively installed on a power drum and a slave drum of each belt, and a belt antiskid device is assembled and debugged. When the radius of the slave roller is measured as ra and the radius of the power roller is measured as rb, the actual linear speeds of the slave roller and the power roller can be calculated as 2 pi raVa and 2 pi rbVb in the control system respectively. In the case where no slip of the belt occurs, the control system calculates a ratio P0 of 2 π raVa to 2 π rbVb as the standard ratio. In the production and running process of the belt, the control system calculates the ratio P1 of 2 pi raVa to 2 pi rbVb in real time, compares P1 with P0, judges that the belt slips if the ratio exceeds a set range, and in the embodiment, judges that the belt slips if the ratio exceeds the set rangeIf the value is more than 0.02, the belt can be considered to have an obvious slipping phenomenon, and a slipping alarm is generated.

In order to eliminate the slipping phenomenon, the control system immediately adjusts the output speed of the power roller to ensure that the output speed is consistent with the speed of the slave roller, thereby achieving the purpose of eliminating the slippingNamely, the P1 value is ensured to be restored to P0 as soon as possible, and the specific method is to dynamically adjust the running speed of the power roller and ensure that the P1 is equal to P0 as soon as possible, namely, the P0 value is ensured to be restoredWhere Va1 and Vb1 are the current rotational speeds of the drum and the power drum, respectively, and are calculated by the approximate division:namely:since the values of Vb and Va are sampled when the belt does not slip, the ratio is constant, and the value of Va1 is the speed value of the slave drum sampled in real time, the value of Vb1 also dynamically follows Va1 to realize that the value of P1 is restored to P0 as soon as possible.

Through the phenomenon of quickly eliminating the slip, the material on the belt is ensured not to be accumulated. When the belt needs to be stopped, in order to avoid long-time idle running in the stopping process of the belt and material accumulation of the belt due to errors of the stopping time (shown in figure 3), a control method of the belt needs to be stopped in order to eliminate the material accumulation of the belt. The technology calculates the material conveying time of the belt according to the slave roller speed of all the belts on the premise that the running speed of the belt can be measured and controlled, confirms the shutdown time of each belt through accurate calculation of the material position, and avoids the phenomenon that the belt generates material accumulation due to error or slippage in the forward shutdown time. In the example, a material transfer system comprising a storage bin and 3 transfer belts is designed, wherein a first belt length L1 is set, a roller radius r1 is set, and a running speed Va1 is set; the length of the second belt L2, from the radius of the roller r2, the running speed Va2, the length of the third belt L3, from the radius of the roller r3, the running speed Va3, when the whole set of the transfer system needs to be stopped, the control system calculates the time for the first belt to empty the materials on the first belt from the closing of the hopper gateThe second belt is emptiedTime spent on the materialTime taken for the third belt to empty its contentsTherefore, in the forward stop process of the belt system, after the control system closes the feeding valve, the materials can be completely moved out of the belt as long as the first belt is ensured to operate for t1, the second belt is ensured to operate for t2 and the 3 rd belt is ensured to operate for t3, and the situation that the materials are accumulated on the belt to cause subsequent starting difficulty is avoided. If a certain belt slips to cause the hidden danger of material accumulation of the belt, a slip alarm can be generated, the control system can adjust the opening degree of a feeding valve to control material flow and adjust the output speed of a power roller of the belt, the running load of the belt is reduced, the material accumulation on the belt is eliminated, meanwhile, the control system calculates the actual linear speed of the belt by means of the rotating speed of the roller, the time required for emptying the belt material can be estimated in real time in the process of sequential shutdown, the shutdown is allowed only after the actual time of the belt running is longer than the calculated time, and the material accumulation on the belt is avoided.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.