RU2290360C2 - Check weight - Google Patents

Abstract

FIELD: mechanical engineering; testing facilities.

SUBSTANCE: invention relates to testing of load-lifting and transport machines. Proposed check weight made in form of pack contains blocks 2 of preset mass with through recess in height and round section grips for coupling with slings. Each block has centering member in form of truncated pyramid with lower base arranged symmetrically relative to axes of symmetry of block on its upper plane. Recess 7 corresponding to centering member is made also in form of truncated pyramid from side of lower plane 6 of each block to fix blocks relative to each other and form wedge clearance between lower and upper planes of adjacent blocks non-occupied, respectively, by recess and centering member mentioned above. Wedge clearance between blocks increased in direction from line of contour of lower base of centering member square to line of outer contour of assembly pack. Centering member and assembly pack block are made integral from one material.

EFFECT: simplified design, reduced metal usage, improved reliability of check weight.

2 cl, 3 dwg

Description

The invention relates to hoisting-and-transport machines, including control stacked loads for testing lifting machines.

Known type-setting cargo for testing cranes (USSR author's certificate No. 1207990, MKI ⁴ V 66 C 13/18, 1983), containing a rod with a base attached to it and elements for communication with sling units, covering the weight rod (blocks) with radial slots.

The disadvantages of the specified stacked cargo are significant metal consumption and inconvenience of operation. The inconvenience of operation is the possibility of freezing the blocks to each other, the formation of cracks in them and the difficulties of mounting-dismantling of the stacked cargo due to the ingress of water and ice in its cavity. Locking inserts freely lying in the through recesses of weights may be lost during assembly-disassembly of bulk cargo. The alignment of weights when recruiting them into the foot must be provided manually. In addition, the connection of the annular discs with the rod using a weld that accepts the entire weight of the stacked load and is under the load of separation, is not reliable during prolonged use.

Known typesetting cargo for testing lifting mechanisms (Russian patent No. 1377240, IPC B 66 C 13/18, 1988), containing loads of calibrated mass, elements for communication with sling units and a locking device.

This technical decision is taken as a prototype.

The disadvantages of the prototype are a fairly high structural complexity and significant metal consumption. Considering also that water penetrates into the gaps between its constituent blocks and through the through holes in the blocks and that ice forms at temperatures below the freezing point of water, ice can form cracks in the blocks and their subsequent destruction. In addition, the blocks frozen to each other cause additional difficulties when assembling and disassembling the stacked load to give it the required mass - the stacked load becomes non-separable.

The technical result of the invention is to simplify the design, reduce metal consumption and increase the reliability of the control load.

This technical result is achieved in that the centering element is made in the form of a truncated pyramid with a lower base symmetrically relative to the axis of symmetry of the block on its upper plane, and the recess corresponding to the centering element is also made in the form of a truncated pyramid from the side of the lower plane of each block with the possibility of fixing the blocks relative to each other and the formation of a wedge gap between the lower and upper planes of adjacent blocks, not occupied respectively by prismatic recesses and entriruyuschim element with the change in the gap formed in the direction of increasing in a direction from the contour line of the lower base of the centering element perpendicularly to the outer contour line typesetting packet blocks, and the block packet typesetting and centering element are integrally formed of the same material.

The present invention is illustrated by drawings, which depict in figure 1 - frontal projection with a local section, figure 2 is a top view of a block of a stacked package of control cargo, figure 3 is a frontal projection of a General view of the control cargo.

The control load 1 in the form of a stacked package contains the required number of blocks 2 of a given mass. On the upper plane 3 of each block 2, a centering element 5 in the form of a truncated pyramid is located symmetrically relative to the axis of symmetry 4 of the block. To ensure fixation of the blocks relative to each other on the lower plane 6 of block 2, a recess 7 corresponding to the centering element 5 is also made in the form of a truncated pyramid located symmetrically with respect to the axis of symmetry 4 of the block. Between the lower 6 and upper 3 planes of the adjacent fixed blocks 2 of the control load 1 there is a wedge gap 8, made with increasing height in the direction from the line 9 of the contour of the lower base of the centering element 5 perpendicular to the line 10 of the outer contour of block 2. The blocks 2 are equipped with sling units made in the form of grooves 11, through the height, with grabs 12 of circular cross section embedded in the body of the block.

If it is necessary to carry out static and dynamic tests of hoisting machines, a control load 1 of a given mass is collected from blocks 2, while blocks 2 are arranged in decreasing order of their mass in the direction from lower to upper. To do this, when assembling the test load 1 on the test platform, the next block 2 is installed on the block 2 with the largest mass using the slings 12 when sling, so that the centering element 5 is located in the recess 7 and the blocks are fixed from the possibility of horizontal displacement relative to each other. Each subsequent block 2 is stacked on the lower one in the same order.

The collected control load for the sling captures 12 of the lower of the blocks of the stacked package is captured by the hook slings of the lifting machine. Further, in accordance with the methodology, tests of the lifting mechanism are carried out.

After testing or, if necessary, the assembly of the control load 1 with a different specified mass, it is disassembled in the reverse order of assembly.

The proposed control load 1 does not have additional metal structures. Blocks 2 do not have through holes, as a result, the occurrence of water and ice is eliminated on the fixing planes, thereby eliminating the difficulties of mounting and dismounting the test load 1. The presence of a wedge gap 8 between blocks 2 eliminates the possibility of freezing them to each other.

Claims (2)

1. A control load in the form of a stacked package for carrying out static and dynamic tests of hoisting machines, containing blocks of a given mass, made with height-through recesses with grippers of circular cross-section, used to communicate with sling elements, characterized in that each block contains a centering element in in the form of a truncated pyramid with a lower base symmetrically relative to the axis of symmetry of the block on its upper plane, and the recess corresponding to the centering element is also made in the form of of the intersected pyramid from the side of the lower plane of each block with the possibility of fixing the blocks relative to each other and the formation of a wedge gap between the lower and upper planes of adjacent blocks not occupied by the recess and the centering element, respectively, while the wedge gap between the blocks increases in the direction from the outline line of the lower the base of the centering element perpendicular to the line of the outer contour of the block of the stacked packet. 2. The control load according to claim 1, characterized in that the centering element and the block of the typesetting package are made as a single unit of one material.

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