CN202531534U - Hydraulic cylinder with built-in stroke detection device - Google Patents
Hydraulic cylinder with built-in stroke detection device Download PDFInfo
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- CN202531534U CN202531534U CN2012201699560U CN201220169956U CN202531534U CN 202531534 U CN202531534 U CN 202531534U CN 2012201699560 U CN2012201699560 U CN 2012201699560U CN 201220169956 U CN201220169956 U CN 201220169956U CN 202531534 U CN202531534 U CN 202531534U
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Abstract
The utility model relates to a hydraulic cylinder, in particular to the hydraulic cylinder with a built-in stroke detection device. The hydraulic cylinder comprises a cylinder body, a ceramic piston rod, a lower end cover and a sensor, wherein the ceramic piston rod is provided with a stroke detection section; the stroke detection section is divided into a start section, a stroke section and an end section; grooves are formed on the stroke section at equal intervals, and the width of each groove is equal to an interval between each two grooves; the width of the start section is not smaller than the groove width of double units; the sensor approaches or touches the surface of the stroke detection section; and the detection direction of the sensor faces the center of the ceramic piston rod and is parallel to the axis of the ceramic piston rod. The hydraulic cylinder has the advantages that accumulated errors caused by interference during operation can be eliminated; the quantity of cable cores of the sensor is decreased, and the cable cores only comprise a power positive core, a power negative core and a signal core; compared with the conventional six-core cable, the three-core cable is low in using cost; and the size of the sensor is reduced, the sensor is smaller than one third of the conventional sensor of the ceramic piston rod, an output signal is an analog quantity signal, and the hydraulic cylinder is high in generality.
Description
Technical field
The utility model relates to a kind of oil hydraulic cylinder, relates in particular to a kind of oil hydraulic cylinder of built-in device for detecting distance of travel.
Background technique
The working environment of hydraulic hoist is complicated and changeable, therefore corrosion protection, the wear-resisting property of the piston rod of its hydraulic jack required very high, so must carry out the processing such as anticorrosion and wear-resisting of necessity to its surface, with guaranteed performance.Tratitional technology is at the piston rod surface electrochromism, and the hexavalent chromium in the electrochromism is proved to be a kind of carcinogen.And through facts have proved, after the piston rod of plating is putting into operation for many years, occur the phenomenon of corrosion unavoidably, therefore, electrochromism is not a kind ofly can fundamentally solve the piston rod preserving method yet.The built-in device for detecting distance of travel that hydraulic jack adopted of original employing chrome-plated piston bar has two kinds; A kind of is mangneto formula Linear displacement transducer; It detects length no longer than 6000mm; And when the setting type of oil hydraulic cylinder was inclination or level, sensor will produce certain free amount of deflection, thereby directly has influence on the precision of stroke detection; It must and can only be installed on tops on the oil hydraulic cylinder in addition, also must leave the slotted hole that is used to install Linear displacement transducer in the middle of the piston rod, and in view of above factor, the application area of this mangneto formula Linear displacement transducer is also comparatively limited.A kind of in addition is the built-in device for detecting distance of travel of wire rope; Be about to rotating coder and constant-force spring mechanism and be combined into a kind of device that can be installed on tops on the oil hydraulic cylinder; The wire rope that drives the encoder rotation is connected with piston rod head through attachment screw; Drive the encoder rotation with stretching out of piston rod, thereby detect the stroke of oil cylinder with withdrawal.Not only profile is bigger for above-mentioned two kinds of built-in device for detecting distance of travel, must have abundant space to use, and installation process comparatively bothers, and particularly when maintenance, needs the oil hydraulic cylinder loam cake is opened, and whole process effort is time-consuming.
Existing oil hydraulic cylinder with built-in device for detecting distance of travel; Though it is good inadequately to have overcome corrosion resistance, the wear resistance on original chrome-plated piston bar surface; And the built-in device for detecting distance of travel stroke detection length limited system of the hydraulic jack of original employing chrome-plated piston bar, built-in device for detecting distance of travel profile is big, the deficiency that install, maintenance bothers; But because the operation of piston rod before detecting can produce integrating error, so can influence the precision of detection.Existing in addition stroke detection sensor bulk is also bigger, and the cable core number is more, complex structure, and cost is high.
The model utility content
The technical problem that the utility model will solve is: in order to improve the testing precision of device for detecting distance of travel, improve the rationality of structure, the utility model provides a kind of oil hydraulic cylinder of built-in device for detecting distance of travel.
The utility model solves the technological scheme that its technical problem adopted: a kind of oil hydraulic cylinder of built-in device for detecting distance of travel; Have cylinder body, ceramic cylinder rod, lower end cap and sensor; Has the stroke detection section on the described ceramic cylinder rod; The stroke detection section is divided into The initial segment, trip segment and ending segment, is provided with to described trip segment equal intervals the groove that width equates with spacing, and the width of described The initial segment and ending segment is not less than the groove width of twice; Described sensor is near to or in contact with the surface of stroke detection section, the detection side of sensor to over against the center of ceramic cylinder rod and with the parallel axes of ceramic cylinder rod.
Further, particularly, the width of said The initial segment and ending segment is 2～3 times a groove width.
For the ease of installing and maintenance, described sensor is installed on the lower end cap of oil hydraulic cylinder.
For the ease of detecting; Described sensor and stroke detection section near to or in contact with end face be provided with first sensing unit, second sensing unit and the 3rd sensing unit that is complementary with the trip segment groove width, described sensor internal is equipped with the arithmetic processor that reads each sensing unit information.
The beneficial effect of the utility model is that increase The initial segment and ending segment on the detection segment of the ceramic cylinder rod of the oil hydraulic cylinder of the built-in device for detecting distance of travel of the utility model can be eliminated in service because of disturbing the cumulative error that produces when piston rod runs to here; The cable core number of sensor reduces in addition, has only power supply just, power-, signal three cores; Adopt six conductor cable before comparing, reduced the cable user cost, the volume of sensor reduces; Less than before the ceramic cylinder rod sensor 1/3rd, the output signal is an analog signals, versatility is good.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the optimum embodiment's of oil hydraulic cylinder of the built-in device for detecting distance of travel of the utility model a structural representation.
Fig. 2 is the structural representation of ceramic cylinder rod of the oil hydraulic cylinder of the built-in device for detecting distance of travel of the utility model.
Fig. 3 is the enlarged view at A place among Fig. 2.
Fig. 4 is the sensor construction schematic representation of the oil hydraulic cylinder of the built-in device for detecting distance of travel of the utility model.
Among the figure: 1, cylinder body, 2, ceramic cylinder rod, 2-1, The initial segment, 2-2, trip segment, 2-2-1, groove, 2-3, ending segment, 3, lower end cap, 4, sensor, 4-1, first sensing unit, 4-2, second sensing unit, 4-3, the 3rd sensing unit.
Embodiment
Combine accompanying drawing that the utility model is done further detailed explanation now.These accompanying drawings are the schematic representation of simplification, the basic structure of the utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
Like Fig. 1～shown in Figure 4; Be the optimum embodiment of the oil hydraulic cylinder of the built-in device for detecting distance of travel of the utility model; A kind of oil hydraulic cylinder of built-in device for detecting distance of travel; Have cylinder body 1, ceramic cylinder rod 2, lower end cap 3 and sensor 4, have the stroke detection section on the ceramic cylinder rod 2, the stroke detection section is divided into The initial segment 2-1, trip segment 2-2 and ending segment 2-3; Be provided with to trip segment 2-2 equal intervals the groove 2-2-1 that width equates with spacing; The width of The initial segment 2-1 and ending segment 2-3 is not less than the groove width of twice, and sensor 4 is near to or in contact with the surface of stroke detection section, the detection side of sensor 4 to over against the center of ceramic cylinder rod 2 and with the parallel axes of ceramic cylinder rod 2.The width of The initial segment 2-1 and ending segment 2-3 is 2～3 times a groove width; Sensor 4 is installed on the lower end cap 3 of oil hydraulic cylinder; Sensor 4 and stroke detection section near to or in contact with end face be provided with the first sensing unit 4-1, the second sensing unit 4-2 and the 3rd sensing unit 4-3 that is complementary with trip segment 2-2 groove width, sensor 4 inside are equipped with the arithmetic processor that reads each sensing unit information.The design groove width of ceramic cylinder rod 2 depends on the design accuracy grade.
During work; Along with moving of ceramic cylinder rod 2; The first sensing unit 4-1, the second sensing unit 4-2 and the 3rd sensing unit 4-3 read the groove 2-2-1 information on the ceramic cylinder rod 2, form the signal that has displacement information, through signal combination; Through the internal arithmetic processor processes, be converted into transmit run-length data electrical signal transfer to the rear centralized control system.Zero clearing when sensor reads the piston rod head mark, output maximum range when reading the piston rod trailer label.Also can The initial segment 2-1 be positioned on the piston rod arbitrary position as the indicator, absolute position.
The cable core number of the sensor of the utility model reduces, and has only power supply just, power-; Signal three cores adopt six conductor cable before comparing, and have reduced the cable user cost; The volume of sensor reduces; Less than before the ceramic cylinder rod sensor 1/3rd, the output signal is an analog signals, versatility is good.
With above-mentioned desirable embodiment according to the utility model is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this model utility technological thought.The technical scope of this model utility is not limited to the content on the specification, must confirm its technical scope according to the claim scope.
Claims (4)
1. the oil hydraulic cylinder of a built-in device for detecting distance of travel; It is characterized in that: have cylinder body (1), ceramic cylinder rod (2), lower end cap (3) and sensor (4); Described ceramic cylinder rod has the stroke detection section on (2); The stroke detection section is divided into The initial segment (2-1), trip segment (2-2) and ending segment (2-3); Be provided with to described trip segment (2-2) equal intervals the groove (2-2-1) that width equates with spacing; The width of described The initial segment (2-1) and ending segment (2-3) is not less than the groove width of twice, and described sensor (4) is near to or in contact with the surface of stroke detection section, the detection side of sensor (4) to over against the center of ceramic cylinder rod (2) and with the parallel axes of ceramic cylinder rod (2).
2. the oil hydraulic cylinder of a kind of built-in device for detecting distance of travel as claimed in claim 1, it is characterized in that: the width of said The initial segment (2-1) and ending segment (2-3) is 2～3 times a groove width.
3. the oil hydraulic cylinder of a kind of built-in device for detecting distance of travel as claimed in claim 1, it is characterized in that: described sensor (4) is installed on the lower end cap (3) of oil hydraulic cylinder.
4. the oil hydraulic cylinder of a kind of built-in device for detecting distance of travel as claimed in claim 1; It is characterized in that: described sensor (4) and stroke detection section near to or in contact with end face be provided with first sensing unit (4-1), second sensing unit (4-2) and the 3rd sensing unit (4-3) that is complementary with trip segment (2-2) groove width, described sensor (4) inside is equipped with the arithmetic processor that reads each sensing unit information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201699560U CN202531534U (en) | 2012-04-20 | 2012-04-20 | Hydraulic cylinder with built-in stroke detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201699560U CN202531534U (en) | 2012-04-20 | 2012-04-20 | Hydraulic cylinder with built-in stroke detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202531534U true CN202531534U (en) | 2012-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201699560U Expired - Fee Related CN202531534U (en) | 2012-04-20 | 2012-04-20 | Hydraulic cylinder with built-in stroke detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202531534U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375454A (en) * | 2012-04-20 | 2013-10-30 | 江苏武进液压启闭机有限公司 | Hydraulic cylinder with built-in stroke detecting device |
| CN104220839A (en) * | 2013-04-12 | 2014-12-17 | 株式会社小松制作所 | Hydraulic cylinder stroke movement diagnosis support device and hydraulic cylinder stroke movement diagnosis support method |
-
2012
- 2012-04-20 CN CN2012201699560U patent/CN202531534U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375454A (en) * | 2012-04-20 | 2013-10-30 | 江苏武进液压启闭机有限公司 | Hydraulic cylinder with built-in stroke detecting device |
| CN104220839A (en) * | 2013-04-12 | 2014-12-17 | 株式会社小松制作所 | Hydraulic cylinder stroke movement diagnosis support device and hydraulic cylinder stroke movement diagnosis support method |
| US9347763B2 (en) | 2013-04-12 | 2016-05-24 | Komatsu Ltd. | Hydraulic cylinder stroke operation diagnosis assisting device and hydraulic cylinder stroke operation diagnosis assisting method |
| CN104220839B (en) * | 2013-04-12 | 2017-03-15 | 株式会社小松制作所 | The stroke action diagnosis assisting system of the stroke action diagnostic aid and hydraulic working cylinder of hydraulic working cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20170420 |