CN101949401B - Oil cylinder stroke detection device, hydraulic system and engineering machinery with system - Google Patents
Oil cylinder stroke detection device, hydraulic system and engineering machinery with system Download PDFInfo
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- CN101949401B CN101949401B CN2010102918310A CN201010291831A CN101949401B CN 101949401 B CN101949401 B CN 101949401B CN 2010102918310 A CN2010102918310 A CN 2010102918310A CN 201010291831 A CN201010291831 A CN 201010291831A CN 101949401 B CN101949401 B CN 101949401B
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- oil cylinder
- detection device
- hoop
- coil ring
- stroke detection
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Abstract
The invention provides an oil cylinder stroke detection device, which comprises an exciting coil ring, a magnetic field sensor and a control circuit, wherein the exciting coil ring is used for generating an alternating magnetic field orthogonal to the cross section of an oil cylinder, and the diameter of the inner periphery of the exciting coil ring is adapted to the diameter of the outer periphery of the oil cylinder; the induction coil is used for generating induction potential under the action of an alternating magnetic field, generating first variable potential when the piston passes through the exciting coil ring and generating second variable potential when the piston rod passes through the exciting coil ring; a position signal generator for generating a position signal after the induction coil generates a first varying potential and a second varying potential. In addition, the invention also provides a hydraulic system with the detection device and a construction machine with the system. The detection device provided by the invention has the advantages of simple structure, easiness in processing and assembling, capability of freely adjusting the installation position, stable working performance, no damage to a sealing element of the oil cylinder, better limiting effect and suitability for various hydraulic systems needing limiting.
Description
Technical field
The present invention relates to detection device, relate to a kind of oil cylinder stroke detection device especially.In addition, the invention still further relates to a kind of engineering machinery that comprises the hydraulic system of above-mentioned oil cylinder stroke detection device and have this hydraulic system.
Background technique
Automation, the electromechanical integration degree of modernization project machinery are all very high; Often need detect and then control the stroke of oil cylinder to position of piston in the hydraulic jack of equipment such as equipment and traveling gear; Just to the moving displacement of oil cylinder piston be detected; Particularly for the hydraulic jack in the Stroke Control sequential movements loop, the detection of its piston moving location is absolutely necessary.
Oil cylinder stroke detection system commonly used various informative; Have built-in and external, wherein, built-in detection system is many at oil cylinder inner installation position displacement sensor or near switch; But the built-in detection system complex structure of this kind; Processing difficulties, maintenance are extremely inconvenient, and the mounting hole of employing and sealing will increase fabricating cost greatly; More the external detection system relies on electromechanical stop to press position limit switch and sends signal near switch control valve is moved with blocking; Though this kind detection system is simple in structure, cost is low, easy to maintenance; But often need other design and installation mechanism; And the size of stroke is difficult to adjustment, makes its application receive bigger restriction.
Therefore, be necessary to provide a kind of simple in structure, easy to maintenance, oil cylinder stroke detection device that adjustable positions is whole, to improve the accuracy of oil cylinder stroke control.
Summary of the invention
The present invention aims to provide a kind of oil cylinder stroke detection device and has the hydraulic system of this detection device and have the engineering machinery of this hydraulic system, can solve the complex structure that the oil cylinder stroke detection device exists in the existing technology, technical problem difficult in maintenance.
For this reason, according to an aspect of the present invention, a kind of oil cylinder stroke detection device is provided, it comprises: the field coil ring, be used to produce the alternating magnetic field with the cross section quadrature of oil cylinder, and outer circumference diameter of all diameters and oil cylinder adapts in it; The inductor coil ring is used for generation induced potential under the effect of alternating magnetic field, and when piston passes the field coil ring, produces the first variation electromotive force, when piston rod passes the field coil ring, produces the second variation electromotive force that is different from the first variation electromotive force; The position signal maker links to each other with the inductor coil ring, is used for after the inductor coil ring generates one first variation electromotive force and one second variation electromotive force, generating position signal.
Further, the field coil ring can comprise the field coil and first hoop, can be provided with first annular groove on first hoop, and field coil can be arranged in this first annular groove.
Further, the inductor coil ring can comprise the inductor coil and second hoop, can be provided with second annular groove on second hoop, and inductor coil can be arranged in second annular groove.
Further, first hoop and second hoop can be the hoop of one.
Further, the periphery of hoop can also be provided with enclosing cover.
Further, can also be provided with positioning device on the hoop, be used to prevent that hoop from moving on oil cylinder.
Further, positioning device can comprise screw and the screw that is arranged in the screw, and screw is along the radially setting of hoop, and screw passes screw and contacts with oil cylinder.
According to another aspect of the present invention, a kind of hydraulic system is provided also, it comprises above-mentioned oil cylinder stroke detection device.
Further, field coil ring and inductor coil ring can be arranged at the periphery of hydraulic jack.
According to a further aspect of the invention, a kind of engineering machinery is provided, it comprises above-mentioned hydraulic system.
The present invention has following technique effect:
Oil cylinder stroke detection device of the present invention has utilized electromagnetic induction principle; Because the cross-section area of piston rod and piston is different; The variation that influences the magnetic field of passing oil cylinder is also inequality, and the electromotive force that inductor coil is sensed will change to some extent, thereby detects position of piston.Detection device provided by the present invention is simple in structure, is easy to processing and assembling, can freely adjust the mounting point; And stable work in work; Do not damage the Sealing of oil cylinder, have limit effect preferably, carry out in the spacing hydraulic system applicable to multiple needs.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to accompanying drawings, the present invention is done further detailed explanation.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the oil cylinder stroke detection device wiring construction schematic representation of the preferred embodiment of the present invention;
Fig. 2 is the oil cylinder stroke detection device mounting structure schematic representation of the preferred embodiment of the present invention;
Fig. 3 is the cross-section structure enlarged diagram of oil cylinder stroke detection device I among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In order to solve the complex structure that the oil cylinder stroke detection device exists in the existing technology, technical problem difficult in maintenance; One aspect of the present invention provides a kind of novel oil cylinder stroke detection device, sees also Fig. 1, when the piston rod in the oil cylinder 10 and piston during respectively through the Detecting element position; Because piston rod and piston are magnetic conductive iron (being generally steel No. 45); After field coil 1 energising excitation, because the cross-section area of piston rod and piston is different, its variation that influences magnetic field is also different; The electromotive force that inductor coil 2 is sensed will change to some extent, thereby detect position of piston.
Below in conjunction with accompanying drawing, the structure and the working procedure thereof of oil cylinder stroke detection device of the present invention described.
Fig. 2 is the oil cylinder stroke detection device mounting structure schematic representation of the preferred embodiment of the present invention, and Fig. 3 is the cross-sectional view of oil cylinder stroke detection device I among Fig. 2, sees also Fig. 2 and Fig. 3.
Oil cylinder stroke detection device of the present invention comprises: the field coil ring; This magnetic coil ring is used to produce the alternating magnetic field with the cross section quadrature of oil cylinder; All diameters should adapt with the outer circumference diameter of oil cylinder in it; That is to say that this field coil ring should be suitable for being sleeved on the periphery of oil cylinder; The inductor coil ring is used under the effect of alternating magnetic field, generating induced potential, when piston moves through the field coil ring in oil cylinder; Can influence the variation of alternating magnetic field; And then the current electromotive force that inductor coil produced is changed, can be referred to as first and change electromotive force, correspondingly; Piston rod is different with the cross-section area of piston, the electromotive force of inductor coil is produced be different from first to change second of electromotive force and change electromotive force; The position signal maker; Can directly link to each other with the inductor coil ring or link to each other with the inductor coil ring through chromacoder; This position signal maker can be used for after the inductor coil ring generates one first variation electromotive force and one second variation electromotive force, generating a position signal; Like this, hydraulic control system or whole-control system just can be controlled the mobile of piston according to this position signal.
In order to make oil cylinder stroke detection device of the present invention have better practicability; Preferably; Above-mentioned field coil ring 1 can comprise the field coil 1 and first hoop, and the size of this first hoop should adapt with the periphery of oil cylinder, and is suitable for being installed on the oil cylinder.On this hoop, first annular groove can be set, can field coil 1 be installed in this first annular groove, first hoop that field coil will be installed again is sleeved on the oil cylinder, thereby is implemented in the purpose that forms alternating magnetic field in the oil cylinder.
Similarly, the inductor coil ring also can comprise two-part, and promptly inductor coil 2 and second hoop identical with first hoop can be provided with second annular groove on this second hoop, and inductor coil 2 is arranged in this second annular groove.Thereby make inductor coil 2 to be installed in reliably on the periphery of oil cylinder.
In fact, above-mentioned first hoop and second hoop can be the hoops of two splits, also can be the hoops 3 of one, two annular grooves are set respectively on this hoop 3 are used to install field coil 1 and inductor coil 2.For the ease of installation and removal, this hoop 3 should be to have the opening that can lock.
In order to guarantee safe in utilization and to avoid field coil 1 and inductor coil 2 to be damaged, improve the working life of oil cylinder stroke detection device of the present invention, one deck enclosing cover 4 can also be set in the periphery of hoop 3.
As can beappreciated from fig. 2, oil cylinder stroke detection device of the present invention all is the two ends of the paired periphery that is arranged on oil cylinder 10 usually, can be arranged on particularly on the periphery of shell 11 of oil cylinder 10, thereby detect the shift motion of oil cylinder.But; In order to adapt to multiple oil cylinder stroke designing requirement, and the spacing requirement of satisfying different situations, oil cylinder stroke detection device of the present invention is through being provided with locating piece on hoop 3; Hoop is fixed on the oil cylinder, and can realizes dismounting neatly.
In the present embodiment; Can be at hoop 3 and enclosing cover 4 offer coaxial tapped through hole in the radial direction; Again screw 5 is tightened onto in this tapped through hole, makes screw 5 pass tapped through hole and closely contact, utilize frictional force to play and prevent the effect that hoop 3 slides with the shell 11 of oil cylinder 10.When needing to move hoop 3, can screw be unloaded, move the position of hoop 3, thereby realize changing the purpose of measuring position.
According to another aspect of the present invention, a kind of hydraulic system is provided also, it comprises above-mentioned oil cylinder stroke detection device.Owing to set up above-mentioned oil cylinder stroke detection device; Can detect oil cylinder stroke and piston moving location exactly; The control system of hydraulic system can be controlled the implementation of the element that oil cylinder drives according to the detected travel information of this monitoring device and piston mobile location information; Prevent to cause infringement, improve the working life of oil cylinder and the working efficiency of hydraulic system oil cylinder owing to piston impact is excessive.
At last, according to a further aspect of the invention, a kind of engineering machinery that comprises above-mentioned hydraulic system is provided also, particularly, this project machinery can be a kind of hoist.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an oil cylinder stroke detection device is characterized in that, comprising:
The field coil ring is used to produce the alternating magnetic field with the cross section quadrature of oil cylinder, and outer circumference diameter of all diameters and said oil cylinder (10) adapts in it;
The inductor coil ring; Be used under the effect of said alternating magnetic field, generating induced potential; And when piston passes said field coil ring, produce first and change electromotive force, when piston rod passes said field coil ring, produce and be different from said first and change second of electromotive force and change electromotive force;
The position signal maker links to each other with said inductor coil ring, is used for after said inductor coil ring generates one first variation electromotive force and one second variation electromotive force, generating position signal.
2. oil cylinder stroke detection device according to claim 1 is characterized in that, said field coil ring comprises the field coil (1) and first hoop, and said first hoop is provided with first annular groove, and said field coil (1) is arranged in said first annular groove.
3. oil cylinder stroke detection device according to claim 2 is characterized in that, said inductor coil ring comprises the inductor coil (2) and second hoop, and said second hoop is provided with second annular groove, and said inductor coil (2) is arranged in said second annular groove.
4. oil cylinder stroke detection device according to claim 3 is characterized in that, the hoop (3) that said first hoop and said second hoop are one.
5. oil cylinder stroke detection device according to claim 4 is characterized in that, the periphery of said hoop (3) also is provided with enclosing cover (4).
6. oil cylinder stroke detection device according to claim 5 is characterized in that, said hoop also is provided with positioning device on (3), is used to prevent that said hoop (3) from moving on said oil cylinder.
7. oil cylinder stroke detection device according to claim 6; It is characterized in that; Said positioning device comprises screw and the screw (5) that is arranged in the said screw, and said screw is along the radially setting of said hoop (3), and said screw (5) passes said screw and contacts with oil cylinder (10).
8. a hydraulic system is characterized in that, comprises each described oil cylinder stroke detection device in the claim 1 to 7.
9. hydraulic system according to claim 8 is characterized in that, said field coil ring and said inductor coil ring all are arranged at the periphery of hydraulic jack.
10. an engineering machinery is characterized in that comprising claim 8 or 9 described hydraulic systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102918310A CN101949401B (en) | 2010-09-25 | 2010-09-25 | Oil cylinder stroke detection device, hydraulic system and engineering machinery with system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102918310A CN101949401B (en) | 2010-09-25 | 2010-09-25 | Oil cylinder stroke detection device, hydraulic system and engineering machinery with system |
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| Publication Number | Publication Date |
|---|---|
| CN101949401A CN101949401A (en) | 2011-01-19 |
| CN101949401B true CN101949401B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102918310A Active CN101949401B (en) | 2010-09-25 | 2010-09-25 | Oil cylinder stroke detection device, hydraulic system and engineering machinery with system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434525B (en) * | 2011-11-25 | 2014-12-10 | 三一汽车制造有限公司 | Pumping mechanism |
| CN111637118B (en) * | 2020-05-09 | 2022-02-01 | 中联重科股份有限公司 | Walking type engineering machinery hydraulic cooling system and hydrostatic bulldozer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476011Y (en) * | 2001-05-23 | 2002-02-06 | 祝向永 | Piezomagnetic cable tension sensor for post-tensioning anchor cable system |
| CN1973187A (en) * | 2004-06-16 | 2007-05-30 | 恩德斯+豪斯流量技术股份有限公司 | Magnetically inductive flow rate sensor |
| CN101144495A (en) * | 2006-03-08 | 2008-03-19 | 法国利勃海尔公司 | Position measuring system for hydraulic cylinders |
| EP2073343A1 (en) * | 2007-12-21 | 2009-06-24 | Sick Ag | Sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3084074B2 (en) * | 1991-01-11 | 2000-09-04 | 太陽鉄工株式会社 | How to fix permanent magnets |
| US8058867B2 (en) * | 2008-08-18 | 2011-11-15 | Deere & Company | System for determining the position of a movable member |
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- 2010-09-25 CN CN2010102918310A patent/CN101949401B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476011Y (en) * | 2001-05-23 | 2002-02-06 | 祝向永 | Piezomagnetic cable tension sensor for post-tensioning anchor cable system |
| CN1973187A (en) * | 2004-06-16 | 2007-05-30 | 恩德斯+豪斯流量技术股份有限公司 | Magnetically inductive flow rate sensor |
| CN101144495A (en) * | 2006-03-08 | 2008-03-19 | 法国利勃海尔公司 | Position measuring system for hydraulic cylinders |
| EP2073343A1 (en) * | 2007-12-21 | 2009-06-24 | Sick Ag | Sensor |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平4-236804A 1992.08.25 |
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| CN101949401A (en) | 2011-01-19 |
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Owner name: HUNAN SANYI PORT EQUIPMENT CO., LTD. Free format text: FORMER OWNER: KM GROUP CO., LTD. Effective date: 20150615 |
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Effective date of registration: 20150615 Address after: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee after: Hunan 31 harbour facilities Co., Ltd Address before: 410100 31 industrial city, Changsha economic and Technological Development Zone, Hunan, Changsha Patentee before: KM Group Co., Ltd. |
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Effective date of registration: 20220513 Address after: 519090 first floor of office auxiliary room, No. 631, Sanhu Avenue, Pingsha Town, Jinwan District, Zhuhai City, Guangdong Province Patentee after: SANY MARINE HEAVY INDUSTRY Co.,Ltd. Patentee after: Hunan Sany Port Equipment Co., Ltd Address before: 410100 31 industrial city, Changsha economic and Technological Development Zone, Hunan Patentee before: HUNAN SANYI PORT FACILITIES CO.,LTD. |