Device to measure lifting mechanism load rope tension

FIELD: transport.

SUBSTANCE: invention relates to lifting-and-conveying equipment, particularly to devices intended for controlling load rope tensioning. Device to measure load rope tension comprises base accommodating force pickup and lever. Lever support incorporates rolling bearing and is pivoted to aforesaid base via axle. Lever arm is articulated with load rope with the help of taper bush and interacts with force pickup. Lever arm has a stop for its face surface to come in contact with load rope. Stop face surface features bent shape with constant curvature radius equal to distance from the dace to lever support axle.

EFFECT: higher accuracy of tension measurement, faultless operation of lifting mechanism.

2 cl, 1 dwg

 

The invention relates to hoisting and transport machinery, namely, devices which are used to control the tension of the hoist rope hoisting mechanism.

A device for measuring the tension of the hoist rope hoisting mechanism, containing a base, on which are located the sensor and effort arm, one shoulder interacts with the sensor effort, and the other with a cargo rope (A.S. USSR №450772, IPC VS 23/88, 1974).

This device is intended for use in the branches of the hoist rope, coming down on the winch drum lifting mechanism. However, when lifting or lowering the load on the winch drum changes the number of layers of the hoist rope, this increases or decreases the angle of rise of the specified branches of the hoist rope from the block associated with the corresponding lever arm of the known device. And changing the angle of rise changes the length of the force arm from the branches of the impact of the hoist rope relative to the support arm. This leads to disruption of the ratio of the lengths of the arms of the lever and, consequently, to change the magnitude of the force acting on the force sensor, regardless of the actual tension of the hoist rope, that means that the error of measurement of the tension of the hoist rope. It can create an emergency the th situation during operation of the lifting mechanism.

A device for measuring the tension of the hoist rope lifting mechanism, which is closest to the proposed technical solution essential features and the achieved result, containing a base, on which are located the sensor efforts and the lever, a support which is pivotally connected with the base, with one of his shoulder connected with the cargo rope, and other made with the possibility of interacting with the sensor efforts ("the Cranes pipelaying TR, TR", Manual 71-RA, Chelyabinsk, 2005, p.25. A copy is enclosed. Cm. Annex 1, 2).

This device is anchored in the branches of the hoist rope of the hoisting mechanism. However, during lifting or lowering, this device also comes deviation of the hoist rope of the device for measuring the tension of the hoist rope, changing the length of the lever arm associated with the cargo rope. This leads to the violation of the ratio of the lengths of the arms of the lever. As a result the magnitude of the force acting on the force sensor, changed regardless of the actual tension of the hoist rope. In addition, in the design of this device provides installation support arm directly on the axis of the base with the formation of a sliding bearing, which has a high nest and the stable point of friction. Because of these factors manifest error of measurement of the tension of the hoist rope. Thus, the known device for measuring the tension of the hoist rope also does not guarantee trouble-free operation of the lifting mechanism.

The task is decided by the authors, is the creation of devices capable of high precision measurement of the tension of the hoist rope and, therefore, guaranteeing trouble-free operation of the lifting mechanism.

To solve this problem, in the device for measuring the tension of the hoist rope hoisting mechanism, containing a base, on which are located the sensor efforts and the lever, a support which is pivotally connected with the base, with one of his shoulder connected with the cargo rope, and other made with the possibility of interacting with the sensor efforts, the authors propose a lever arm associated with the cargo rope, in addition to provide a focus located and made interoperable its end surface with a cargo rope, with a specified end surface to perform curved with a constant radius of curvature equal to the distance from it to the axis of the support arm.

In addition, the authors offer support arm to provide a rolling bearing.

The proposed device, in which the lever arm, connected the th with a cargo rope, made a stop with the front surface is curved with a constant radius of curvature equal to the distance from it to the axis of the support arm allows you to keep communicating branch of the hoist rope relative to the support arm at a constant distance, i.e. to maintain a constant length of the force arm from the impact of the hoist rope on the lever. As a result, when lifting or lowering the load to a constant ratio of the lengths of the arms of the lever. Therefore, the magnitude of the force acting on the force sensor, varies only depending on the actual tension of the hoist rope. Thus, the proposed device provides accurate measurement of the tension of the hoist rope and ensures trouble-free operation of the lifting mechanism.

When conducting a search of the patent and scientific literature revealed no technical solutions containing the proposed set of essential features that allows to make a conclusion on the conformity of the proposed technical solutions to the criterion "novelty".

Analysis of the known devices for measuring the tension of the hoist rope hoisting mechanism showed that the proposed set of essential features that improve the accuracy of measuring the tension of the hoist rope and thereby provide asavari the second lifting mechanism, it is not obvious to specialists. Therefore, the proposed solution meets the criterion of "inventive step".

Industrial applicability of the claimed technical solution is seen from the description of the structure of the device for measuring the tension of the hoist rope hoisting mechanism.

The drawing shows the proposed device for measuring the tension of the hoist rope hoisting mechanism.

Device for measuring the tension of the hoist rope lifting mechanism comprises a base 1 on which are located the sensor efforts 2 and the lever 3. Bearing 4 of the lever 3 is provided with a rolling bearing 5 and pivotally connected with the base 1 through the axis 6. The shoulder 7 of the lever 3 pivotally connected to the cargo rope 8 through the wedge sleeve 9 and the shoulder 10 is configured to interact with a sensor efforts 2. On the shoulder 7 of the lever 3 is made the stop 11 with the possibility of contact of its end surface 12 with a cargo rope 8.

The end surface 12 of the stop 11 is made curved with a constant radius of curvature R equal to the distance from it to the axis of the support arm.

The proposed device is anchored in the branches of the hoist rope and works as follows.

During operation of the lifting mechanism of the cargo rope 8 is in constant contact with the end surface 12 of the stop 11. Execution of the stop 11 with the end surface 12 is curved with a constant radius of curvature R retains the leg length equal to the distance from the end surface 12 to the axis 6 of a support arm 3, when the deviation of the hoist rope 8 during lifting or lowering. From the effects of the hoist rope 8 on the end surface 12 of the stop 11 its tension force P is transmitted through the arm 10 of the lever 3 on the sensor efforts 2. Marginal effort that is perceived by the sensor 2, is defined constructively with the maximum value of the tension of the hoist rope 8, the nominal force sensor 2 and depends only on the actual tension of the hoist rope 8. The signal from the sensor efforts 2 is fed to the control device (not shown), which allows you to stop the hoisting mechanism upon reaching the maximum allowable value of the tension of the hoist rope 8. Installation on a support 4 of the rolling bearing 5 provides a low and stable friction torque in this node and increases the accuracy of the measurement.

The proposed device for measuring the tension of the hoist rope hoisting mechanism provides high precision measurement of the tension force and ensures trouble-free operation of the lifting mechanism.

1. Device for measuring the tension of the hoist rope Protodyakonov the mechanism, containing the base, which houses the sensor efforts and the lever, a support which is pivotally connected with the base, with one of his shoulder connected with the cargo rope, and other made with the possibility of interacting with the sensor efforts, characterized in that the lever arm associated with the cargo rope, equipped with an additional emphasis, which made interoperable its end surface with a cargo rope, with a specified end surface is made curved with a constant radius of curvature equal to the distance from the said end surface to the axis of the support arm.

2. The device according to claim 1, characterized in that the support arm provided with a rolling bearing.



 

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3 cl, 1 dwg

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