JPH0525331U - Weighing device on belt conveyor - Google Patents

Abstract

(57) [Abstract] [Purpose] Correcting the angle of the carry amount of a reclaimer such as a boom belt, which has a characteristic that the inclination angle always changes depending on the delivery position of the carried object, and accurately detects it. [Structure] Loaded load W ₁ detector 8 on conveyor 7, speed V detector 10 of conveyor 7 and inclination angle θ detector 9
And the angle-corrected true load W based on the detection result input from each detector is calculated by W = W ₁ / cos θ, and the carry amount is calculated by W × V. [Effect] Highly accurate measurement of the amount of conveyance on a belt conveyor having a tilt angle or a belt conveyor with a changing tilt angle can be performed, and the error between the required amount of conveyance and the total amount of conveyance can be minimized, thus improving the conveyance efficiency. You can

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weighing device for a conveyor whose inclination angle changes, for example, a boom conveyor of a boom-type reclaimer that discharges bulk materials from piles stacked in a yard.

[0002]

[Prior Art]

 As a weighing device for measuring the instantaneous transport amount (flow rate) and total transport amount of powdered or granular material or agglomerate transported on a belt conveyor, a merick-type weighing device is known, but the installation location is horizontal. Or it is limited to fixed belt conveyors with a small inclination angle. However, in recent years, it has been required to improve the transportation efficiency of the transportation device by saving labor of equipment and promoting automation. This improvement in transportation efficiency can be achieved by installing a weighing machine at the base of the load of powder or lumps, that is, in the transfer route closest to the yard where the load is loaded. It is important to reduce the quantity error.

For that purpose, it is most efficient to install a weighing machine on a state-of-the-art belt conveyor such as a boom belt of a dispenser such as a reclaimer that dispenses a conveyed product from a pile piled in a yard. . However, the boom belt of the boom type reclaimer has the characteristic that the inclination angle changes greatly depending on the delivery position of the piled conveyed items. It is impossible to detect the transport amount.

As a countermeasure against this, a device for mounting a gauge unit at an arbitrary position on the belt conveyor and detecting the distortion amount of the carrier receiving horizontal frame at that position to continuously measure the instantaneous transport amount of the load (special feature (Kaisho No. 51-113664), in a conveyor scale device that electrically detects the load on the conveyor belt and the speed of the conveyor belt and multiplies them to measure the transport amount, the detected load is digitized. Analog-digital conversion means for converting into a digital signal, a correction calculation device means for correcting the digital load weight signal by a broken line approximation considering the characteristics of the load weight detection system, a load weight after the calibration curve correction, and a conveyor The corrected transportation amount calculation means that calculates the corrected transportation amount by multiplying the belt speed, and the load before the calibration curve correction and the conveyor belt speed are multiplied. A conveyor scale device (Japanese Patent Application Laid-Open No. 61-162717) provided with a raw transport amount calculating means for calculating the raw transport amount for calibration curve correction has been proposed.

[0005]

[Problems to be solved by the device]

 In the device disclosed in Japanese Patent Laid-Open No. 51-113664, the gauge unit detects the distortion amount of the carrier receiving horizontal frame to measure the instantaneous transportation amount, so that the inclination angle is always changed depending on the delivery position of the conveyed object. In the case of a boomer belt of a reclaimer having the above, it is impossible to accurately weigh the conveyed amount. Further, since the device disclosed in Japanese Patent Laid-Open No. 61-162717 detects the load on the conveyor belt by means of the load cell, it is similar to the device disclosed in Japanese Patent Laid-Open No. 51-113664, depending on the delivery portion of the conveyed product. Even if it is installed on the boom belt of a reclaimer, which has the characteristic that the inclination angle changes constantly, it is not possible to accurately weigh the conveyed amount.

An object of the present invention is to weigh a device on a belt conveyor that can accurately detect the amount of conveyance even when installed on a boom belt of a reclaimer that has a characteristic that the inclination angle changes constantly depending on the delivery site of the conveyed product. To provide.

[0007]

[Means for Solving the Problems]

 The present inventors conducted various tests and examinations in order to achieve the above object. As a result, in order to accurately detect the load on the belt conveyor where the inclination angle changes, the inclination angle of the belt conveyor is always detected, and the belt conveyor is calculated continuously according to the inclination angle of the belt conveyor. We have found that we can accurately measure the flow rate of the transported goods, and arrived at this invention.

That is, the present invention provides a weighing device for a belt conveyor having a variable inclination angle, which is provided with a load load W ₁ detector on the conveyor, a conveyor speed V detector, and an inclination angle θ detector, Conveyor scale consisting of a calculation unit that calculates the true load W with angle correction based on the detection result input from each detector by W = W ₁ / cos θ and calculates the transport amount by the true load W × conveyor speed V Weighing device in.

[0009]

[Action]

 The load load on the belt conveyor in the present invention may be detected by any method such as a merick weighing device and a device for electrically detecting the load cell. In addition, for detecting the inclination angle of the belt conveyor, for example, an angle detector may be installed at the fulcrum of the boom on which the belt conveyor is installed, and the inclination angle of the boom may be detected and used as the inclination angle of the belt conveyor. Further, the belt conveyor speed detector may be detected by a method of detecting the rotation speed of a speed detection pulley provided on the return side by a pulse generator, a photoelectric rotary encoder, an optical encoder or a magnetic sensor.

In this invention, the detection results from the load W ₁ detector on the conveyor, the conveyor speed V detector, and the inclination angle θ detector are input to the arithmetic unit, and the true load W is W = It is calculated by W ₁ / cos θ and the transport amount is calculated by the true load W × conveyor speed V, so the load load is always corrected according to the inclination angle of the belt conveyor, and the instantaneous flow rate and total transport amount are accurately detected. be able to.

[0011]

【Example】

 The details of this invention will be described below with reference to FIGS. FIG. 1 is an explanatory view when the weighing device of the present invention is installed on a boom conveyor of a boom type reclaimer, FIG. 2 is an explanatory view of correcting a true load from a load load by an inclination angle of the conveyor, and FIG. It is a schematic explanatory view. In FIG. 1, 1 is a boom-type reclaimer, in which a frame 4 is installed on a machine frame 3 movably mounted on a rail 2 laid in a yard so that the frame 4 can be swung and raised and lowered. The bucket wheel 6 installed at the tip of the pile picks up the conveyed items from the piles of the yard, and delivers them via the boom conveyor 7 to a not-shown ground conveyor. The payout is performed by rotating the bucket wheel 6, turning the boom 5, and raising and lowering.

Reference numeral 8 denotes a weighing machine provided on the boom conveyor 7 of the boom reclaimer 1 for detecting a load load of a conveyed object conveyed by the boom conveyor 7. Reference numeral 9 is an angle detector installed at the fulcrum of the boom 5, and 10 is a speed detector of the boom conveyor 7. The load W ₁ , the inclination angle θ of the boom conveyor 7 and the speed V detected by the weighing machine 8, the angle detector 9 and the speed detector 10 are transferred to the calculation unit 11 on the ground in FIG. 3 via a cable reel (not shown). Is entered. As shown in FIG. 2, the calculation unit 11 calculates the true load W, which is angle-corrected based on the input load load W ₁ and the inclination angle θ of the boom conveyor 7, by W = W ₁ / cos θ, and calculates the true load. It is configured to multiply the carry amount from W and the conveyor speed V and display it on the integrator and the instantaneous flow meter 12.

With the above-described configuration, even if the boom 5 undulates and the tilt angle of the boom conveyor 7 changes depending on the payout position from the pile of the yard, the tilt angle θ of the boom conveyor 7 is: It is constantly detected by the angle detector 9 provided at the fulcrum of the boom 5, and is input to the calculation unit 11. On the other hand, since the constant load W ₁ from the weighing machine 8 and the speed V from the speed detector 10 are input to the calculation unit 11, the angle-corrected true load is changed each time the tilt angle θ of the boom conveyor 7 changes. W is calculated, and the true load W and the conveyor speed V are multiplied by the carry amount and displayed on the integrator and the instantaneous flow meter 12.

Therefore, the angle-corrected true load W is calculated by the calculation unit 11 every time the tilt angle of the boom conveyor 7 changes depending on the payout portion from the yard pile, and the carry amount is calculated based on this. Therefore, it is possible to measure the carry amount with high accuracy, the error between the required carry amount and the total carry amount can be made extremely small, and the carry efficiency can be improved.

[0015]

[Effect of the device]

 As described above, according to the present invention, it is possible to perform high-accuracy measurement on a belt conveyor having an inclination angle or a belt conveyor with a changing inclination angle, and to eliminate the error between the required conveyance amount and the total conveyance amount. The number can be extremely reduced, and the transfer efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view when the weighing device of the present invention is installed on a boom conveyor of a boom type reclaimer.

FIG. 2 is a correction explanatory diagram when a true load is obtained from a load depending on an inclination angle of a conveyor.

FIG. 3 is a schematic explanatory view of the devised device.

[Explanation of symbols]

 1 Boom Type Reclaimer 2 Rail 3 Machine Frame 4 Frame 5 Boom 6 Bucket Wheel 7 Boom Conveyor 8 Weighing Machine 9 Angle Detector 10 Speed Detector 11 Computational Section 12 Instantaneous Flow Meter

Claims (1)

[Scope of utility model registration request] 1. A weighing device for a belt conveyor in which a tilt angle changes, and a load W ₁ detector on the conveyor, a conveyor speed V detector, and a tilt angle θ detector are input from each detector. A weighing device for a belt conveyor comprising a calculation unit that calculates a true load W whose angle is corrected based on a detection result by W = W ₁ / cos θ and a carry amount by W × V.