Load cell (Machine-translation by Google Translate, not legally binding)

专利摘要:
A load cell for measuring the tension of the cables of an elevator apparatus, comprising a first body (12), including means for measuring the deformation of said cell (11) when subjected to tensile or compressive stresses; a second body (13) in mechanical contact with means for supporting the lifting device, and male-female ball joint means for mechanically coupling one end of the first body (12) to the corresponding end of the second body (13). (Machine-translation by Google Translate, not legally binding)
公开号:ES2600869A1
申请号:ES201531016
申请日:2015-07-10
公开日:2017-02-13
发明作者:Rafael González Gallegos
申请人:Dinacell Electronica SL；
IPC主号:

专利说明:

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DESCRIPTION
Load cell Object
The present invention relates to a load cell for measuring the load on a support cable of a lifting device.
State of the art
It is known that a lifting device uses a suspension arrangement with cables, by means of which the support and the movements of elevation and descent of the cabin are carried out. The load of the cabin is transmitted to the cables of the installation thus exerting a force on the cables proportional to the weight of the cabin, having to adjust these
cables with very precise voltages and the maintenance of the
installation conditions, due to the critical function of the sustainability and the risk of the mismatch or deterioration of the cables.
The lifting device is provided with one or several load cells for measuring the
tension of the support cables. The loads that the cables have to support
Sustainability in the real operation are changing due to the operation itself, friction, variation of adjustments, coupling of mechanisms and others.
The load cell comprises, but is not limited to, strain gauges for weighing measurements. The strain gauges measure the degree of deformation of the load cell by the action of the load.
The load cell measures or weighs the load of the lifting device, measuring the forces on the cables, supporting belts or structure; before the same apparatus is set in motion, to avoid displacements that exceed the maximum or established limit of the lifting apparatus.
The distribution of the load, whose weight is to be measured, within the lifting apparatus tends or may nod with respect to the fixing means of the load cell to the structure of the lifting apparatus, transmitting a cradling effect to the load cell itself. That is to say, the lifting device heads or has a risk of possible pitching with respect to the support of the load cell causing overloads added to the elements of
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suspension that can cause malfunction, discomfort or even damage to lifting mechanisms.
Summary
The present invention seeks to solve one or more of the problems set forth above by means of a load cell as defined in the claims.
One aspect is to supply a load cell for weighing in a lifting apparatus comprising a first body, which includes means for measuring the deformation of said cell when the same load cell is subjected to compression efforts; and a second body mechanically joined by a male-female ball joint; that is, one end of the first body comprises a concave or convex seat that serves as a housing for a convex or concave protuberance located at the corresponding end of the second body.
The male-female ball joint allows the load cell, once mounted in its working position, to self-align by executing multi-directional alignment movements to avoid transmitting due static stacking efforts to the load cell to misalignments in the cell assembly or produced when the lifting device moves a load vertically.
The load cell has a longer useful life by being more resistant to all kinds of efforts, eliminating any problems caused by fatigue caused by flexion of the load cell itself. It is more resistant to overloads caused by cabin or platform cradles in addition to those produced at the start and acceleration of the lifting device.
Consequently, the load cell is only subjected to compression efforts. This leads to an increase in the safety of the load cell without the need to increase the size of the load cell for large loads.
The load cell has a column configuration between the most distant ends of the first body and the second body.
The means for measuring the deformation of said cell comprise at least one deformation sensor or, if applicable, an strain gauge arranged in the first body to better capture the deformation of the load cell when a load is deposited.
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on the lifting apparatus including the weight or tare of the hoist box or platform.
The load cell is made of materials of high mechanical resistance and can be placed in the mooring of the cables or support tapes, to allow the individual measurement and control of each mooring.
Brief description of the figures
A more detailed explanation of the device according to embodiments of the invention is given in the following description based on the attached figures in which:
Figure 1 shows in a perspective view of a first body and a second body of a load cell for measuring the tension in a support cable of a lifting apparatus;
Figure 2 shows in an elevational view a cross-sectional view of the load cell; Y
Figure 3 shows in an elevation view a section of different types of male-female ball joint for the load cell.
Description
In relation to Figures 1 and 2, in which a load cell 11 is shown to measure the tension in a support cable of a lifting device.
The support cable is mechanically coupled to a tractor assembly, so that the load cell works under compression supporting the effort of the support cable to provide a direct measure of the tension of the cable itself.
Male-female ball joint. This joint system of sections by means of articulated ball, allows to absorb misalignments between two adjacent surfaces avoiding significant torsion loads.
The load cell 11 comprises a first body 12, which includes means for measuring the deformation of said cell when the same load cell 11 is subjected to compression efforts; and a second body 13 in mechanical contact with a supporting structure, which mechanically cooperates with a terminal end of the lifting cable of the lifting apparatus, so that the supporting cable extends to
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through a cylindrical bore 21 through defined along the axis of revolution of the load cell 11, the cell 11 in its entirety, shown in Figure 2, through the support cable. Consequently, the support cable crosses both the first body 12 as the second body 13 of the load cell 11, in this way both first and second body 12, 13 are mechanically coupled to be a union of the male-female type head that works under compression; that is, one end of the first body 12 comprises a concave seat 14 which serves as a housing for a convex protuberance 15 located at the corresponding end of the second body, or vice versa, the end of the first body 12 is convex and the end of the second body has the corresponding concave shape.
The terminal end of the support cable protrudes from the flat upper face of the second body 13. The flat bottom face of the first body 12 is in physical contact with a flat and fixed surface of the support structure, so that the second body 13 of the load cell 11, under a compression effort, tends to move towards the flat and fixed surface of the support structure. The male-female ball joint between the first body 12 and the second body 13 evenly distributes the load, compression effort, over the load cell, the first body 12 being compressed between the second body 13 and the flat and fixed surface of The structure of support. The load cell 11 measures by means of deformation means, included in the cell itself (11), the compression to which the first body 12 of the same cell 11 is subjected.
The convex protuberance 15 emerges from the end of the second body 13 to mechanically engage the concave seat 14 of the corresponding end of the first body 12, to supply the load cell 11 with a certain lateral mobility to avoid alignment or misalignment or pitching errors. Load cell 11 preventing the transmission of cradling efforts.
In relation now to Figure 3, the male-female ball joint can be of the radial ball type; angular contact ball where the sliding surfaces are inclined at an angle to the axis of the ball; axial ball has a spherical surface in the protuberance 15 and a hollow and equally spherical surface in the seat 14; or similar.
The load cell 11 as a whole has an elongated paralleleplipe or cylinder shape, made of a material of high mechanical resistance.
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The load cell 11 is capable of detecting the deformation caused by a compression force exerted on it and generating, depending on said force, a signal that can be transmitted to a data processing and control center, which includes a unit of data processing, to provide a value equivalent to the force detected.
In this way, the load cell 11 constantly measures in a direct way the force of the tension of the cable, allowing to regulate and control with precision said tension; but at the same time it verifies the behavior of the mooring of the support cables when the load cell 11 is located in the own mooring of the cables.
In the case of moorings that include a damping spring, such as the moorings of the support cables of the lifting devices, the load cell 11 can be arranged between the spring on which the support cable rests and the holding structure , so that the force of the tension of the cable is applied on the spring and this transmits it to the load cell 11.
The configuration of the load cell 11 allows its resistance to considerable loads to be much higher than other types of cells. This is due to the geometry itself and because the load cell 11 has a certain lateral mobility to avoid cracking, misalignment or pitching efforts that cause overload and fatigue in the material. This fatigue can cause cell 11 to break, something especially dangerous.
An overload can cause deformations in the load cell 11 and as a result erroneous measurements of the loads. The choice of high strength and geometry materials for the fabrication of the load cell minimizes this risk.

权利要求:
Claims (5)
[1]
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1. A load cell to measure the tension in a support cable of a lifting device; characterized in that the load cell (11) comprises a first body
(12) in mechanical contact with a support structure of the lifting apparatus; the first body (12) includes means for measuring the deformation exerted by a second body (13) of the cell (11), one end of the first body (12) and the corresponding end of the second body (13) being mechanically connected by means of a union of the male-female head type.
[2]
2. Cell according to claim 1; characterized in that one end of the first
body (12) comprises a concave seat (14) which serves as a housing for a
convex protuberance (15) located at the corresponding end of the second body
(13).
[3]
3. Cell according to claim 1; characterized in that one end of the first
body (12) comprises a convex seat (14) that serves as a housing for a
protuberance (15) concave located at the corresponding end of the second body
(13).
[4]
4. Cell according to claim 1; characterized in that the male-female ball joint is of the radial head joint type; angular contact ball; axial label or similar.
[5]
5. Cell according to any of the claims; characterized in that the load cell (11) is configured to be installed between a spring on which the support cable rests and a support structure of the lifting apparatus.

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SE520666C2|2001-12-19|2003-08-12|Sik Inst Foer Livsmedel Och Bi|Method and apparatus for processing a pumpable food in an electric field|

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CN104370185B|2013-08-12|2016-10-05|苏州博量传动设备有限公司|A kind of symmetrical four node compensating gears of steel wire rope for elevator group|US10935476B2|2018-04-30|2021-03-02|Ford Global Technologies, Llc|Ball joint sensor|

法律状态:
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