CN116753886A - Automatic compensation pull rope encoder - Google Patents
Automatic compensation pull rope encoder Download PDFInfo
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- CN116753886A CN116753886A CN202310718564.8A CN202310718564A CN116753886A CN 116753886 A CN116753886 A CN 116753886A CN 202310718564 A CN202310718564 A CN 202310718564A CN 116753886 A CN116753886 A CN 116753886A
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- measuring wheel
- piece
- stay cord
- pull rope
- deformation
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- 238000004804 winding Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000003475 lamination Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention provides an automatic compensation stay cord encoder, which belongs to the technical field of stay cord encoder signals, and comprises a single-row measuring wheel wound with a stay cord, wherein the other end of the stay cord is connected with an elastic compensation piece, and the elastic compensation piece is connected with a target object to be measured; one end of the rotating shaft of the measuring wheel is connected with the deformation piece, and the other end of the rotating shaft of the measuring wheel is connected with the rotary encoder; deformation energy storage occurs to the deformation piece during measurement; when the object to be measured is close to the measuring wheel, the deformation piece drives the measuring wheel to reversely rotate to recover the pull rope; the rotation of the measuring wheel drives the rotary encoder to rotate, so as to realize distance measurement; the elastic force generated by deformation of the deformation piece is equal to the elastic force generated when the elastic compensation piece pulls the pull rope, and errors caused by the fact that the winding of the pull rope on the measuring wheel is reduced are compensated. The invention uses an automatic compensation mode, thereby reducing the lamination error caused by multi-winding in the existing stay cord encoder; the structure is simple, the volume and the manufacturing cost of the sensor are hardly affected, and the precision of the stay cord encoder is improved.
Description
Technical Field
The invention relates to the technical field of stay cord encoders, in particular to an automatic compensation stay cord encoder.
Background
The stay cord encoder is also called a stay cord displacement sensor, a stay cord electronic ruler and the like. The linear displacement sensor fully combines the advantages of the angle sensor and the linear displacement sensor, and has the advantages of compact structure, long measurement stroke, high measurement precision, reliable performance and low cost.
The stay cord encoder is mainly applied to measurement of relevant dimensions and control of positions such as linear guide rail systems, hydraulic cylinder systems, telescopic systems, hollow bottle blowing machines, IT equipment, tension adjustment, high-speed automatic feeders, speed adjustment, storage position positioning, pressure machines, papermaking machines, textile machines, sheet metal machines, paper product packaging machines, printing machines, level controllers, construction machines, gate opening degree measurement and the like, is also widely applied to screen display and digital display systems of the testing machine industry, and has considerable prospects.
The pull-cord encoder can detect and measure linear position and velocity by utilizing a flexible pull cord and a spring-loaded spool. The device mainly comprises four main parts of a measuring rope, a spool, a spring and a rotation sensor, and the working principle of the device is as follows: in the sensor housing, a stainless steel pull rope is wound on a precisely-machined straight-barrel cylindrical spool, and can be used as a measuring pull rope reel and an unwinding reel; to maintain the pull-cord tension, a spring is coupled to the spool; coupling the spool to a shaft of a rotation sensor (encoder or potentiometer); since the pull cord of the sensor extends along the movable object, the spool and the sensor shaft will rotate; the rotating shaft will generate an electrical signal proportional to the linear extension or speed of the pull cord.
The common stay cord encoder in the existing market is the coaxial design mode of encoder rotation axis and reel, because the reel is wider than wire rope, wire rope can appear irregular lamination phenomenon on the reel, increases along with the wire winding, and wire radius still can produce undulant on tending to the basis of increase to influence wire winding girth, thereby lead to measuring error. The adoption of the measuring mode of the driven layer can avoid a plurality of windings, but the whole volume and cost of the sensor are increased remarkably.
Disclosure of Invention
The invention aims to provide an automatic compensation stay cord encoder, which controls a steel wire rope to be wound along a variable-diameter spiral line track in a single row by arranging a measuring wheel with a certain winding groove width, and simultaneously combines a tension spring arranged at a rope head part to compensate errors caused by winding change of the steel wire rope, so as to eliminate winding lamination errors by combined action, thereby solving at least one technical problem in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides an automatic compensation stay cord encoder, comprising:
the measuring wheel is wound with a pull rope in a single row, the other end of the pull rope is connected with an elastic compensation piece, and the elastic compensation piece is connected with a target object to be measured;
one end of the rotating shaft of the measuring wheel is connected with the deformation piece, and the other end of the rotating shaft of the measuring wheel is connected with the rotary encoder; wherein,,
when the object to be measured is far away from the measuring wheel, the elastic compensation piece pulls the pull rope to drive the measuring wheel to rotate so that the deformation piece deforms and stores energy; when the object to be measured is close to the measuring wheel, the deformation piece drives the measuring wheel to reversely rotate to recover the pull rope; the rotation of the measuring wheel drives the rotary encoder to rotate, so as to realize distance measurement;
the elastic force generated by deformation of the deformation piece is equal to the elastic force generated when the elastic compensation piece pulls the pull rope, and errors caused by the fact that the winding of the pull rope on the measuring wheel is reduced are compensated.
Preferably, the elastic coefficient of the deformation member is K 1 The diameter of the measuring wheel is D, the diameter of the pull rope is D, the circumference of the pull rope wound on the measuring wheel is C, and the pulling force on the pull rope is F;
every time the stay cord pulls out one circle, the elasticity of deformation spare changes into:
AF＝C*K 1 ；
the elastic coefficient K of the elastic compensation piece is compensated by the stress deformation of the elastic compensation piece and the error caused by the lamination of the pull ropes in the measuring process 2 The method comprises the following steps:
ΔF＝AC*K 2
preferably, the measuring wheel is arranged in the shell, and two ends of the rotating shaft are rotatably extended out of the shell and are respectively connected with the deformation piece and the rotary encoder.
Preferably, a guide pulley is rotatably arranged in the shell, and one end of the pull rope extends out of the shell after bypassing the guide pulley and is connected with the elastic compensation piece.
Preferably, the deformation member is a planar spiral spring.
Preferably, one side of the shell is provided with a vortex spring box, the plane vortex spring is arranged in the vortex spring box, one end of the plane vortex spring is connected with the rotating shaft, and the other end of the plane vortex spring is connected with the vortex spring box.
Preferably, the rotary encoder is attached to the housing.
Preferably, the shell is provided with a through hole for the pull rope to extend out and be connected with the elastic compensation piece.
Preferably, two ends of the elastic compensation piece are respectively connected with a first connector and a second connector, the pull rope is connected with the first connector, and the second connector is connected with the object to be measured.
Preferably, the elastic compensation member is a tension spring.
The invention has the beneficial effects that: the automatic compensation mode is used, so that the lamination error caused by multi-winding in the existing stay cord encoder is reduced; the structure is simple, the volume and the manufacturing cost of the sensor are hardly affected, and the precision deficiency of the traditional stay cord encoder is greatly compensated at a small cost.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a rope encoder with automatic compensation according to an embodiment of the present invention.
Fig. 2 is a rear view of a structure of an automatic compensation pull-rope encoder according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an internal structure of an automatic compensation pull-cord encoder according to an embodiment of the present invention.
Wherein: 1-pulling ropes; 2-measuring wheel; 3-an elastic compensation member; a 5-rotary encoder; 6-a housing; 7-a guide pulley; 8-a volute spring box; 9-through holes; 10-a first connector; 11-a second connector.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by way of the drawings are exemplary only and should not be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or groups thereof.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the description of this specification, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present technology.
The terms "mounted," "connected," and "disposed" are to be construed broadly, and may be, for example, fixedly connected, disposed, detachably connected, or integrally connected, disposed, unless otherwise specifically defined and limited. The specific meaning of the above terms in the present technology can be understood by those of ordinary skill in the art according to the specific circumstances.
In order that the invention may be readily understood, a further description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings and are not to be construed as limiting embodiments of the invention.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of examples and that the elements of the drawings are not necessarily required to practice the invention.
As shown in fig. 1 to 3, in the present embodiment, there is provided an automatic compensation pull-cord encoder, including: the measuring wheel 2 is wound with the stay cord 1 in a single row, the other end of the stay cord 1 is connected with the elastic compensation piece 3, and the elastic compensation piece 3 is connected with a target object to be measured; one end of the rotating shaft of the measuring wheel 2 is connected with a deformation piece, and the other end of the rotating shaft of the measuring wheel 2 is connected with a rotary encoder 5; when the object to be measured is far away from the measuring wheel 2, the elastic compensation piece 3 pulls the pull rope 1 to drive the measuring wheel 2 to rotate so that the deformation piece deforms and stores energy; when the object to be measured is close to the measuring wheel 2, the deformation piece drives the measuring wheel 2 to reversely rotate to recover the pull rope 1; the rotation of the measuring wheel 2 drives the rotary encoder 5 to rotate, so as to realize distance measurement. The elastic force generated by deformation of the deformation member is equal to the elastic force generated when the elastic compensation member 3 pulls the pull rope, and the elastic compensation member 3 compensates errors caused by the fact that the winding of the pull rope on the measuring wheel 2 is reduced.
In the application of the embodiment, the pull rope 1 can be a steel wire rope, and in the practical application, other materials can be selected for the pull rope under the special working condition.
In one embodiment, the deformation member is a planar spiral spring, i.e., a planar spiral spring, which is wound from steel strip, with which a torsional moment can be developed in a plane perpendicular to its axis, thereby storing energy, also known as a spring. One end of the plane scroll spring is connected to the rotating shaft of the measuring wheel 2, the other end of the plane scroll spring is fixed, and when the stay cord 1 pulls the measuring wheel 2 to rotate, the rotating shaft of the measuring wheel 2 drives the scroll spring to deform to store energy. When the external force of the pull rope 1 disappears, the plane scroll spring releases energy to restore the original state, and drives the measuring wheel 2 to reversely rotate, and the pull rope 1 is pulled back. At the same time, ranging is accomplished using a rotary encoder 5 that rotates coaxially with the measuring wheel 2.
In the present embodiment, the relationship between the elastic coefficients of the deformation member and the elastic compensation member 3 is: specifically, let the elastic coefficient of the deformation member be K 1 The diameter of the measuring wheel 2 is D, the diameter of the pull rope 1 is D, the circumference of the pull rope 1 wound on the measuring wheel 2 is C, and the pulling force on the pull rope 1 is F;
every time the pull rope 1 is pulled out one circle, the elasticity of the deformation member is changed into:
ΔF＝C*K 1 ；
by the stress deformation of the elastic compensation piece 3, the error caused by the lamination of the pull ropes 1 in the measuring process is compensated, and the elastic coefficient K of the elastic compensation piece 3 2 The method comprises the following steps:
ΔF＝ΔC*K 2
specifically, for the automatic compensation stay cord encoder in this embodiment, the specific structural components include: the measuring wheel 2 is arranged in the shell 6, and two ends of the rotating shaft are rotatably extended out of the shell 6 and are respectively connected with the deformation piece and the rotary encoder 5.
For example, mounting holes are formed in two side walls of the housing 6, bearings are arranged in the mounting holes, an outer ring of each bearing is fixedly connected with the side wall of the housing, a rotating shaft penetrates through an inner ring of each bearing to extend out of the housing 6, and the inner ring of each bearing is fixedly connected with the surface of the rotating shaft. Thereby realizing the rotation of the rotating shaft.
A guide pulley 7 is rotatably arranged in the shell 6, and one end of the pull rope 1 passes through the guide pulley 7 and then extends out of the shell 6 to be connected with the elastic compensation piece 3. The arrangement of the guide pulley 7 can facilitate the stay cord 1 to extend out of the shell stably and reliably, and avoid shaking or loosening when being pulled out or retracted.
One side of the shell 6 is provided with a vortex spring box 8, the plane vortex spring is arranged in the vortex spring box 8, one end of the plane vortex spring is connected with the rotating shaft, and the other end of the plane vortex spring is connected with the vortex spring box 8. The rotary encoder 5 is connected to the housing 6. The shell 6 is provided with a through hole 9 for the pull rope 1 to extend out and be connected with the elastic compensation piece 3.
The two ends of the elastic compensation piece 3 are respectively connected with a first connector 10 and a second connector 11, the pull rope 1 is connected with the first connector 10, and the second connector 11 is connected with the object to be measured.
In the application of the embodiment, the elastic compensation element 3 can be a tension spring, and in the practical application, a micro hydraulic or pneumatic rod can be used instead. For example, two ends of the micro hydraulic or pneumatic rod are respectively connected with the first connector 10 and the second connector 11.
In actual working conditions, the object to be measured moves or stretches out and draws the elastic compensation piece 3 through the second connector 11, the elastic compensation piece 3 draws the stay cord through the first connector 10, and therefore the measuring wheel 2 is driven to rotate, and finally the rotary encoder 5 is driven to rotate, and distance measurement is achieved. Because the wire casing of measuring wheel 2 only holds single stay cord, avoided the stay cord range upon range of, the measurement error that the drunkenness brought for stay cord receive and release length corresponds with plane volute spring rolling, and stay cord pull-out length and volute spring elasticity form linear relation, and the elasticity is bigger when the stay cord winding is less, and the elasticity is less when the stay cord winding is bigger. Because the elasticity of the vortex spring is equal to the elasticity of the compensation tension spring, the stress of the compensation tension spring is prolonged, and the error caused by the reduction of the winding of the pull rope is compensated.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it should be understood that various changes and modifications could be made by one skilled in the art without the need for inventive faculty, which would fall within the scope of the invention.
Claims (10)
1. An automatic compensation pull-cord encoder, comprising:
a measuring wheel (2) wound with a pull rope (1) in a single row, wherein the other end of the pull rope (1) is connected with an elastic compensation piece (3), and the elastic compensation piece (3) is connected with a target object to be measured;
one end of the rotating shaft of the measuring wheel (2) is connected with the deformation piece, and the other end of the rotating shaft of the measuring wheel (2) is connected with the rotary encoder (5); wherein,,
when the object to be measured is far away from the measuring wheel (2), the elastic compensation piece (3) pulls the pull rope (1) to drive the measuring wheel (2) to rotate so that the deformation piece deforms and stores energy; when the object to be measured is close to the measuring wheel (2), the deformation piece drives the measuring wheel (2) to reversely rotate to recover the pull rope (1); the rotation of the measuring wheel (2) drives the rotary encoder (5) to rotate, so as to realize distance measurement;
the elastic force generated by deformation of the deformation piece is equal to the elastic force generated when the elastic compensation piece (3) pulls the pull rope, and the elastic compensation piece (3) compensates errors caused by the fact that the winding of the pull rope on the measuring wheel (2) is reduced.
2. The self-compensating pull-cord encoder of claim 1, wherein the deformation member has an elastic coefficient of K 1 The diameter of the measuring wheel (2) is D, the diameter of the pull rope (1) is D, the circumference of the pull rope (1) wound on the measuring wheel (2) is C, and the pulling force on the pull rope (1) is F;
the elastic force of the deformation piece changes into every time the stay cord (1) is pulled out one circle:
ΔF＝C*K 1 ；
the elastic coefficient K of the elastic compensation piece (3) is compensated by the stress deformation of the elastic compensation piece (3) and the error caused by the lamination of the pull rope (1) in the measuring process 2 The method comprises the following steps:
ΔF＝ΔC*K 2
3. the automatic compensation stay cord encoder according to claim 1 or 2, wherein the measuring wheel (2) is arranged in the housing (6), and both ends of the rotating shaft are rotatably extended out of the housing (6) and are respectively connected with the deformation member and the rotary encoder (5).
4. An automatic compensation stay cord encoder according to claim 3, characterized in that a guiding pulley (7) is rotatably arranged in the housing (6), and one end of the stay cord (1) extends out of the housing (6) after bypassing the guiding pulley (7) and is connected with the elastic compensation member (3).
5. The self-compensating pull-cord encoder of claim 4, wherein the deformation member is a planar spiral spring.
6. The automatic compensation stay cord encoder according to claim 5, wherein a scroll spring box (8) is arranged on one side of the housing (6), the plane scroll spring is arranged in the scroll spring box (8), one end of the plane scroll spring is connected with the rotating shaft, and the other end of the plane scroll spring is connected with the scroll spring box (8).
7. An automatic compensating pull-cord encoder according to claim 3, characterized in that the rotary encoder (5) is connected to the housing (6).
8. An automatic compensation stay cord encoder according to claim 3, characterized in that the housing (6) is provided with a through hole (9) for the stay cord (1) to extend out and connect with the elastic compensation member (3).
9. The automatic compensation stay cord encoder according to claim 1 or 2, wherein two ends of the elastic compensation piece (3) are respectively connected with a first connector (10) and a second connector (11), the stay cord (1) is connected with the first connector (10), and the second connector (11) is connected with the object to be measured.
10. The self-compensating pull-cord encoder of claim 9, wherein the resilient compensation member (3) is a tension spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310718564.8A CN116753886A (en) | 2023-06-16 | 2023-06-16 | Automatic compensation pull rope encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310718564.8A CN116753886A (en) | 2023-06-16 | 2023-06-16 | Automatic compensation pull rope encoder |
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| Publication Number | Publication Date |
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| CN116753886A true CN116753886A (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310718564.8A Pending CN116753886A (en) | 2023-06-16 | 2023-06-16 | Automatic compensation pull rope encoder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117405163A (en) * | 2023-12-07 | 2024-01-16 | 科瑞工业自动化系统（苏州）有限公司 | Active error compensation method and system for stay cord encoder |
-
2023
- 2023-06-16 CN CN202310718564.8A patent/CN116753886A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117405163A (en) * | 2023-12-07 | 2024-01-16 | 科瑞工业自动化系统（苏州）有限公司 | Active error compensation method and system for stay cord encoder |
| CN117405163B (en) * | 2023-12-07 | 2024-03-26 | 科瑞工业自动化系统（苏州）有限公司 | Active error compensation method and system for stay cord encoder |
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