RU1839709C - Method and device for determining tension of flexible members - Google Patents

Description

tension along a line parallel to the tension force of the flexible element, placing the sensor together with the contact point of the blocks in the same plane on different sides of the tension line of the flexible element, measure the force acting on the tension sensor from the side of the blocks.

The device for implementing this method comprises identical blocks made of semi-blocks 1 and 2 rigidly interconnected with a profiled side surface, a force impact sensor 3 made in the form of a tension sensor with power-driving elements, which are connected to two with hinges 4 protrusions, each of which is made on the side surface of the corresponding unit, In each half-unit 1 and 2 there is a guide groove 5 for the flexible element 6. Holes 7 are provided in the blocks for mounting if appropriate in autonomous twist applying significant moments when the device is mounted on a pre-tensioned cable.

The semiblocks are connected by screws 8. Depending on the required measurement accuracy and the type of force transducer used, as well as the range of rope tension efforts, the shape of the rolling surfaces F of the blocks can be cylindrical or have a curve shape.

The device operates as follows.

Two blocks are mounted next to a loose or tensioned rope, interconnecting each other by blocks 1 and 2 of the mirror image along the plane of the connector with the screws 8 screwed together. Then, bringing the blocks together until they touch each other, twist them into

opposite directions, using holes 7 for this. After twisting, the ears of the blocks are connected to the sensor 3 by means of hinges 4. Under the action of forces on the rope wa blocks, opposite moments arise. Since the blocks are in contact with each other, these moments are balanced by the tensile moment of the sensor 3. As the forces acting on the rope increase, the last straightens, the sensor 3 lengthens, and the blocks roll over each other by surfaces F. If these surfaces are cylindrical While rolling is significant, the rope slides in the grooves of the blocks, i.e. slip friction appears, which is highly undesirable. To avoid this, surfaces F must have a certain curvature. If the proposed device uses a force sensor with minimal elongation, and also install the device on a loosely stretched rope so that the twisting moment is not excessive from the rope running through the grooves during twisting, then the surfaces F can be simply cylindrical. In this case, the error will be minimal, and the manufacturing technology is much simpler.

The proposed device can be installed on ropes located in any spatial position and has very small dimensions and mass. Thus, for steel crane ropes with a diameter of 15.5 mm and a tension of 1.0 tf, the device has dimensions of not more than t60 x 95 x 50 mm and a mass of about 3.8 kg.

(56) -1. USSR copyright certificate Mg1578531.cl. G 01 L 5/06. 1988.

2. Copyright certificate of the USSR No. 1395962, cl. G 01 L5 / 04, 1984.

Claims (2)

1. A method for determining the tension of flexible elements, the method being that the flexible element is wrapped in a block that is twisted around an axis perpendicular to the axis of the flexible element, and a parameter is measured by which the tension of the flexible element is determined, characterized in that in order to increase efficiency by providing the ability to determine the tension during movement of the flexible element, to increase accuracy and reduce dimensions, the flexible element is wrapped around the second block, twist it in the direction opposite to the direction of By screwing the first block, the blocks are brought into contact with each other by their lateral surfaces and connected to each other along a line parallel to the tension of the flexible element with a tensile sensor, which is located together with the contact point of the blocks in the same plane on opposite sides of the line the tension force of the flexible element, and the force acting on the tensile sensor from the side of the blocks is used as a measured parameter. 2. A device for determining the tension of flexible elements, comprising a unit and a force sensor, distinguishing so that, in order to increase the effective block, with an ego, each block bridges by providing opportunities made of rigidly connected between definitions of tension during movement of semiblocks with a profiled bending element, increasing the accuracy of the egg surface, symmetrical with respect to the reduction in size, it is equipped with a plane of their connector. With the same block identical to the first one, the sensor perpendicular to the axis of spinning of the blind force is made in the video card, and in each half block it is made a tension sensor with a power-guiding electronic guide groove for flexible elements that are pivotally connected to the JQ ment, -a units are mounted with possible two protrusions, each of which is contacted by each other full on the side surface of the correspondingly profiled side surface.