阅读说明：本技术 一种移动栈桥式带式输送机的拉紧装置的拉力检测方法 (Tension detection method for tensioning device of mobile trestle type belt conveyor ) 是由 秦镇 辜小川 张俊 桑冬一 赵琼 刘伟 任仲伸 白世玉 于 2019-10-31 设计创作，主要内容包括：本发明涉及一种移动栈桥式带式输送机的拉紧装置的拉力检测方法,拉紧装置在靠近卷扬机的两个定滑轮之间的钢丝绳上设有一个拉力传感器,本发明通过在拉紧装置液压马达5上安装差压传感器,实时取得液压马达进出口油路压差,从而计算得到的钢丝绳拉力,并将其与钢丝绳上拉力传感器所测的钢丝绳拉力进行比对,即可判断拉力传感器是否存在故障。(The invention relates to a tension detection method of a tension device of a mobile trestle type belt conveyor, wherein the tension device is provided with a tension sensor on a steel wire rope between two fixed pulleys close to a winch, and the invention obtains the pressure difference of an oil circuit at an inlet and an outlet of a hydraulic motor in real time by installing a differential pressure sensor on a hydraulic motor 5 of the tension device, thereby calculating the tension of the steel wire rope, and comparing the calculated tension with the tension of the steel wire rope measured by the tension sensor on the steel wire rope, thus judging whether the tension sensor has faults or not.)

1. A tension detection method for a tension device of a mobile trestle type belt conveyor is characterized in that the tension device is provided with a tension sensor, and the method comprises the following steps:

s1, installing a differential pressure sensor on the hydraulic motor 5 of the tensioning device, and connecting an inlet-outlet oil way of the hydraulic motor with an inlet-outlet of the differential pressure sensor to obtain the working pressure difference of the inlet-outlet oil way of the hydraulic motor in real time;

s2, obtaining the output torque of the hydraulic motor according to the working pressure difference delta P of the oil way of the inlet and the outlet of the hydraulic motor;

s3, the winch pulls the two steel wire ropes to pull the four movable pulleys to drag the tensioning roller to realize belt tensioning, and if the current steel wire rope tension is F_NThe output torque T of the hoist can be known as r F_NCos α × 2, α is an included angle between the steel wire rope and the vertical direction;

s4, the output torque T of the winch is equal to the output torque M of the hydraulic motor; can finally be found out

S5, acquiring the steel wire rope tension measured by the tension sensor on the steel wire rope in real time, and calculating the steel wire rope tension with the steel wire rope tension F obtained in the step S4_NAnd comparing, and if the difference value of the two exceeds a certain range, indicating that the tension sensor arranged on the steel wire rope has a fault and needs to be stopped for maintenance.

2. The tension detection method of the tension device of the mobile trestle type belt conveyor according to claim 1, characterized in that: the hydraulic motor of the tensioning device drives the winch to drive the steel wire rope to pull the tensioning roller to realize belt tensioning through the fixed pulley and the movable pulley.

3. The tension detection method of the tension device of the mobile trestle type belt conveyor according to claim 1, characterized in that: the hydraulic motor output torque M is:

vg: displacement of the hydraulic motor per revolution;

Δ P: the working pressure difference of the oil circuit at the inlet and the outlet of the hydraulic motor;

η_mh: mechanical efficiency of the hydraulic motor.

4. The tension detection method of the tension device of the mobile trestle type belt conveyor as claimed in claim 1, wherein cos α ≈ 1.

5. The tension detection method of the tension device of the mobile trestle type belt conveyor according to claim 1, characterized in that: the tension sensor is arranged on the steel wire rope between the two fixed pulleys close to the winch.

Technical Field

The invention belongs to the technical field of tension detection, and particularly relates to a tension detection method for a tensioning device of a mobile trestle type belt conveyor.

Background

The tension device is one of the main components of the belt conveyor, and mainly provides certain tension force for the normal operation of a conveying belt of the belt conveyor, so that the tension of the minimum tension point of the conveying belt is ensured, the permanent elongation of the conveying belt is compensated, and when a tension sensor of the tension device breaks down, the tension value cannot be detected, so that the tension is too large or too small; an excessively large belt may be pulled out and an excessively small belt may slip.

Disclosure of Invention

The invention provides a tension detection method for a tensioning device of a mobile trestle type belt conveyor, which aims to solve the technical problems that: when the tension sensor of the tension device has a fault, the tension value can not be detected.

In order to solve the technical problem, the invention provides a tension detection method of a tension device of a mobile trestle type belt conveyor, wherein the tension device is provided with a tension sensor on a steel wire rope between two fixed pulleys close to a winch, and the tension detection method is characterized by comprising the following steps of:

s1, installing a differential pressure sensor on the hydraulic motor 5 of the tensioning device, and connecting an inlet-outlet oil way of the hydraulic motor with an inlet-outlet of the differential pressure sensor to obtain the working pressure difference of the inlet-outlet oil way of the hydraulic motor in real time;

s2, obtaining the output torque of the hydraulic motor according to the working pressure difference delta P of the oil way of the inlet and the outlet of the hydraulic motor;

s3, the winch pulls the two steel wire ropes to pull the four movable pulleys to drag the tensioning roller to realize belt tensioning, and if the current steel wire rope tension is F_NThe output torque T of the hoist can be known as r F_NCos α × 2, α is an included angle between the steel wire rope and the vertical direction;

s4, the output torque T of the winch is equal to the output torque M of the hydraulic motor; can finally be found out

S5, acquiring the steel wire rope tension measured by the tension sensor on the steel wire rope in real time, and calculating the steel wire rope tension with the steel wire rope tension F obtained in the step S4_NAnd comparing, and if the difference value of the two exceeds a certain range, indicating that the tension sensor arranged on the steel wire rope has a fault and needs to be stopped for maintenance.

Has the advantages that: according to the invention, the differential pressure sensor is arranged on the hydraulic motor 5 of the tensioning device, so that the pressure difference of the oil passages at the inlet and the outlet of the hydraulic motor is obtained in real time, and the tension F of the steel wire rope is calculated_NAnd comparing the tension with the steel wire rope tension measured by the tension sensor on the steel wire rope, and judging whether the tension sensor has faults or not.

Drawings

FIG. 1 is a schematic view of a mobile trestle belt conveyor tensioning device;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a schematic view of a differential pressure sensor structure.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.

The invention provides a tension detection method of a tension device of a mobile trestle type belt conveyor, wherein a hydraulic motor 5 of the tension device drives a winch 4 to drive a steel wire rope to pull a tension roller 6 through a fixed pulley 2 and a movable pulley 1 to realize belt tension, and a tension sensor 3 is arranged on the steel wire rope between the two fixed pulleys 2 close to the winch; the method is characterized by comprising the following steps:

s1, installing a differential pressure sensor on the hydraulic motor 5 of the tensioning device, and connecting an inlet-outlet oil way of the hydraulic motor with an inlet-outlet of the differential pressure sensor, so that the pressure difference of the inlet-outlet oil way of the hydraulic motor can be obtained in real time;

s2, according to the hydraulic motor output torque formula:

vg: the displacement of the hydraulic motor per revolution,unit: cm³/r；

Δ P: working pressure difference MPa of an inlet and an outlet of the hydraulic motor;

η_mh: mechanical efficiency of hydraulic motor

Vg of 80.8cm for a known NG80 hydraulic motor³/r；

η_mh0.8 to 0.9, 0.85 is selected.

Thereby obtaining

S3, the radius r of the winding machine of the tension device is 260 mm; the belt tensioning is realized by dragging four movable pulleys to drag the tensioning roller by the winch through two steel wire ropes, and assuming that the current tension of the steel wire ropes is F_NThe output torque T of the hoist can be known as r F_NCos α × 2 and α are included angles between the steel wire ropes and the vertical direction, and the included angles are very small and can be ignored, so that cos α is approximately equal to 1;

s4, the output torque T of the winch is equal to the output torque M of the hydraulic motor; can finally be found out

S5, acquiring the steel wire rope tension measured by the tension sensor on the steel wire rope in real time, and calculating the steel wire rope tension with the steel wire rope tension F obtained in the step S4_NAnd comparing, and if the difference value of the two exceeds a certain range, indicating that the tension sensor arranged on the steel wire rope has a fault and needs to be stopped for maintenance.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.