CN101280796B - Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use - Google Patents
Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use Download PDFInfo
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- CN101280796B CN101280796B CN2008100248425A CN200810024842A CN101280796B CN 101280796 B CN101280796 B CN 101280796B CN 2008100248425 A CN2008100248425 A CN 2008100248425A CN 200810024842 A CN200810024842 A CN 200810024842A CN 101280796 B CN101280796 B CN 101280796B
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Abstract
The invention relates to an absolute stroke detecting technology, in particular to an absolute stroke detecting method used combining with a ceramic piston rod and a device thereof. The detecting section of the piston rod is divided into a plurality of continuous segments along an axial direction and a group of marks are arranged within each segment. The group of marks can be identified and converted into a group of unique codes by a sensor which is used for reading the codes of varied marks of current positions, then decoding and identification is carried out to the codes read by the sensor to know the segment where the sensor is located and the offset of the position of a corresponding segment where the sensor is located and then the current absolute position of the sensor can be obtained by combining the segment where the sensor is located with the offset of the position of the corresponding segment where the sensor is located. The sensor is an initiative magnetic detecting type and the marks on the piston rod represent to be a series of well-regulated grooves and bulge loops. The absolute stroke detecting technology guarantees that no impact is caused to the read of the position of the piston rod during power-off period and no accumulated error exists.
Description
Technical field
The present invention relates to a kind of absolute type stroke detection technology, particularly a kind of absolute type stroke detecting method and device thereof that is used in combination with ceramic cylinder rod.
Background technique
The working environment of hydraulic hoist is complicated and changeable, therefore corrosion protection, the wear-resisting property of its piston rod 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 through electroplating 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.And it is ceramic coated at piston rod surface, can not only be organically the characteristic such as high temperature resistant, wear-resisting and corrosion-resistant of the obdurability of metallic material, workability etc. and stupalith be combined, improve the advantages such as corrosion resistance, wear resistance of piston rod surface, and the generation of unharmful substance and more help environmental protection.
The original built-in device for detecting distance of travel that adopts of oil hydraulic cylinder 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 is 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.In view of above factor, the application area of this mangneto formula Linear displacement transducer is also comparatively limited.Another 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 by 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.
Ceramic cylinder rod is to process groove on the piston rod matrix with the built-in device for detecting distance of travel of incremental, adopt the sensor that produces the train pulse signal that piston rod is carried out stroke detection, this is a kind of built-in device for detecting distance of travel that is used in combination with ceramic cylinder rod, its concrete grammar is equidistant in piston rod surface processing earlier, groove with certain depth, then at its surperficial ceramic coated material, its principle is: because the piston rod matrix is 45# steel or alloyed steel, it has magnetic conductivity, and the stupalith of surface spraying is nonmetallic material, no magnetic conductivity, when sensor by the height differ groove the time, the air gap that produces just has size, the size of air gap just causes the size of magnetic resistance, and the size of magnetic resistance just causes the power in magnetic field, and sensor is by power that detects magnetic field and the power that converts electric current to, output pulse signal, sensor just can detect the spacing of groove on the piston rod matrix, and the groove on the piston rod matrix is equidistant, so just can convert the stroke of piston rod to.This built-in device for detecting distance of travel is integrated on the ceramic cylinder rod, directly detects the displacement of piston rod, need not change, so also there is not cumulative error, so its detection is not subjected to travel limits, arbitrary distance of run all can detect, and its testing precision can reach 1mm; Because its compact structure, volume are little, only need directly be installed on the lower end cap of oil hydraulic cylinder in addition, do not need other device in the oil hydraulic cylinder outside, so its maintenance be very convenient.The shortcoming of the built-in device for detecting distance of travel of incremental is if the landing of system cut-off state lower piston rod, and the stroke of its landing will be left in the basket.
Publication number is a kind of absolute position detection method that is used for stroke sensing cylinder of CN 1201118A, the variation that is based on the increment type pulse of fixed intervals obtains traveled distance, the notion that does not have any coding, on basis based on equidistant groove, the correction groove that increases different spacing under fixed intervals comes the absolute position of calibration current location, reaches the purpose of eliminating integrating error.Because the principle that adopts still is the two-way phase difference is that the signals of 90 degree are measured moving displacement and movement direction, so the displacement that can't the checkout system power down produces during power on again of this technology.
Summary of the invention
In order to overcome the built-in device for detecting distance of travel of incremental in the landing of system cut-off state lower piston rod, the stroke of its landing is with uncared-for deficiency, the present invention will encode the establishment recognition technology combine with Modern Manufacturing Technology, under the ceramic cylinder rod manufacturing technology, structure linear type is position encoded, by the array-type sensor recognition coding, obtain sensor accurate position information on ceramic bar, fundamentally abandoned detecting method based on step-by-step counting.It will possess ceramic cylinder rod all advantages with the built-in device for detecting distance of travel of incremental, evade the shortcoming of ceramic cylinder rod with the built-in device for detecting distance of travel of incremental simultaneously again.At first be the structure of coding: as coding, the most frequently used absolute type coding is the annular coding, in a circumference, construct different code channels with constant spacing, many roads groove code channel is from the inside to the outside arranged on the absolute encoder optical code disk, the per pass groove is successively with 2 lines, 4 lines, 8 lines, the such layout of 16 lines, like this, each position at encoder, read the logical, dark of per pass groove by n light eye, obtaining one group of 2 unique scale coding that change to 2 n-1 power from 2 zero degree side is Gray code, and this just is called n position absolute encoder.But but can't simply the annular coding be flattened and become the straight-line code that can be used on the straight-bar.
The technical solution used in the present invention is: a kind of absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod, comprise the detection segment on the piston rod and read the sensor of distinguishing mark and area code mark with district's mark and area code mark, detection segment on the described piston rod comprises the magnetic conductivity matrix and covers the stupalith of matrix surface, district mark and area code mark are by clocklike groove and bulge loop constitute on the detection segment that is arranged on piston rod, described sensor is close to piston rod surface or is kept small distance at interval, sensor is an active magnetic detection type, mark off corresponding tooth position according to the area code coding in the area code mark in section, corresponding codes position in the area code coding is represented in each tooth position; Mark off the tooth position of 9 adjacent 2mm in the area code label range in the section, width between each tooth position is 2mm, and 9 tooth positions can be represented corresponding codes position in 9 area code codings respectively, and what the tooth existence was arranged on the tooth position is 0, anodontia existence be 1, the district's mark in the section is the wide bulge loop of 6mm that is; Described sensor comprises a plurality of multi-joint dress sensors, sensor retaining ring and sensor groups pedestal, be arranged with several sensor units in the multi-joint dress sensor, spacing is 8mm between each sensor unit, multi-joint dress sensor is fixed on the sensor groups pedestal by the sensor retaining ring, adjacent multi-joint dress sensor staggers each other at vertical direction, and multi-joint dress sensor distributes according to vertical direction spacing 1mm; The sensor groups pedestal is identical with the radian of piston rod.Because be magnetic detecting initiatively, the distance between the sensor unit is restricted, can not be very approaching, can't realize point-blank that just closely-spaced sensor arranges.For addressing this problem, design a kind of multi-joint dress array-type sensor of equidistant, large-spacing.Sensor comprises a plurality of multi-joint dress sensors, sensor retaining ring and sensor groups pedestal, be arranged with several sensor units in the multi-joint dress sensor, multi-joint dress sensor is fixed on the sensor groups pedestal by the sensor retaining ring, adjacent multi-joint dress sensor staggers each other at vertical direction, and the sensor groups pedestal is identical with the radian of piston rod.
Further, described sensor is equipped with housing outward, and housing is fixed on the end of piston rod oil cylinder, and the holddown spring that is arranged between housing and the sensor is pressed on sensor on the piston rod.
The method of utilizing the aforesaid absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod to carry out stroke detection, at first the piston rod detection segment is divided into a plurality of continuous sections along axial direction, in each section inside one group echo is set, this group echo can and convert one group of unique encoding to by sensor identification, utilize sensor to read the coding of each mark of current location, then by to sensor acquisition to the coding identification of decoding learn the position offset of sensor section of living in and the relative section of living in of sensor, the position offset of sensor section combined sensor of living in section of living in relatively can be drawn the current absolute position of sensor.This method is a kind of technology of using the straight-line code detection position with reference to the relevant technologies proposition of rotary coding and bar code.Use the coding of different length according to the using scope of different length.Use this cryptoprinciple.When 16 of code lengths.Precision mm level, the detection length that coding can cover reach nearly 3000 meters.Can on any object, make straight-line code on this coding theory by encoding law, by ultrasound, ccd, the magnetic induction array reads present encoding numerical value, thereby judges residing straight line absolute position on object at present.
Further, a group echo that is provided with in described each section comprises district's mark and area code mark, district's mark and corresponding area code mark thereof can and convert unique area code coding that encode in one group of district and a group reflects when proparea mark section of living in by sensor identification to, adjacent area code mark separates by district's mark, and the district in each section is labeled as unified specification and equidistant setting; Be specially by the coding that sensor the is read process that identification obtains the residing absolute position of sensor of decoding:
A, from the coding that sensor reads, identify district coding;
The coding of B, the coding that will distinguish the coding back and coding front, district calculates and generates the area code coding, determines to belong to which section when the proparea mark thus;
C, be coded in position in the coding that sensor reads, calculate sensor relatively when the shift offset of proparea mark according to the district;
The shift offset that D, basis are worked as the proparea mark relatively when the residing section combined sensor of proparea mark obtains the current absolute position of sensor.
The invention has the beneficial effects as follows: this absolute stroke detection technical guarantee the slip of piston rod during power down can not impact reading of position, there are not integrating error, digitizing detects, digital quantity transmits, the high Allowance Design of system, because utilized the power of efficient deformation on a large scale of spring, sensor unit is close on the ceramic cylinder rod, requirement for machining and assembly error has dropped to mm level level, simultaneously in service in system, guarantee that sensor array and piston rod relative position are stable.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the scheme of installation of sensor of the present invention on ceramic cylinder rod.
Fig. 2 is the structural representation of the positive apparent time of sensor of the present invention.
Fig. 3 is the structural representation of sensor of the present invention when overlooking.
Fig. 4 be on the ceramic cylinder rod of the present invention the structural representation of detection segment.
Fig. 5 is the plane outspread drawing of sensor of the present invention.
Among the figure: 1. piston rod, 11. 1 districts, 12. 2 districts, 13. 3 districts, 2. sensor, 21. multi-joint dress sensors, 22. sensor retaining rings, 23. sensor groups pedestals, 24. sensor units, 3. district's mark, 4. area code mark, 5. housing, 6. holddown spring, 7. double wedge.
Embodiment
A kind of absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod shown in Fig. 1,2,3 and 4 comprises detection segment and the sensor 2 that reads the coded message on the detection segment on the piston rod 1.Detection segment is divided into a plurality of continuous sections along axial direction, one group echo all is set in each section, this group echo can and convert one group of unique encoding to by sensor 2 identifications, this group echo comprises district's mark 3 and area code mark 4, district's mark 3 and accordingly that group area code mark 4 can and convert district's coding to and one group of representative is encoded when unique area code of proparea mark 3 sections of living in by sensor 2 identifications, adjacent area code mark 4 separates by district's mark 3, and district's mark 3 of each section is unified specification and equidistant the setting.Detection segment on the piston rod 1 is made of the stupalith of magnetic conductivity matrix and matrix surface, and district's mark 3 and area code mark 4 are made of the groove and the bulge loop that are arranged on the piston rod detection segment.Sensor 2 is an active magnetic detection type.The piston rod matrix is 45# steel or alloyed steel, it has magnetic conductivity, and the stupalith of surface spraying is nonmetallic material, no magnetic conductivity, when sensor 2 during by groove and bulge loop, the air gap of generation just has size, and the size of air gap just causes the size of magnetic resistance, the size of magnetic resistance just causes the power in magnetic field, and sensor 2 converts the respective coding signal to by the power that detects magnetic field.
Shown in Fig. 2 and 3, initiatively the sensor 2 of magnetic detecting comprises a plurality of multi-joint dress sensors 21, sensor retaining ring 22 and sensor groups pedestal 23, be arranged with several sensor units 24 in the multi-joint dress sensor 21, multi-joint dress sensor 21 is fixed on the sensor groups pedestal 23 by sensor retaining ring 22, as shown in Figure 5, adjacent multi-joint dress sensor 21 staggers each other at vertical direction.Sensor groups pedestal 23 is identical with the radian of piston rod 1.As shown in Figure 1, outside the sensor 2 housing 5 is installed, housing 5 is fixed on the end of piston rod oil cylinder, and the holddown spring 6 that is arranged between housing 5 and the sensor 2 is pressed on sensor 2 on the piston rod 1.
Classify the absolute type stroke detecting method that example is used in combination with ceramic cylinder rod as with the sensor array that eight six multi pack linearities are arranged.As shown in Figure 5, six sensor units 24 are arranged in the multi-joint dress sensor 21, spacing is 8mm between each sensor unit 24.Eight multi-joint dress sensors 21 are distributed according to vertical direction spacing 1mm.The array of Gou Chenging is equivalent to a sensor groups of being arranged by 48 sensor unit 24 straight lines like this, and the sensor unit 24 in the sensor groups is 1mm at interval, and detection range is 47mm.In the present embodiment, the length of each section is 44mm all on the piston rod 1, and the detection range of sensor is 47mm, is used to judge sensor 2 residing sections so sensor 2 always can obtain enough codings.
The coding rule of the area code coding in the section is the binary sequence coding, certainly the coding rule of area code coding does not limit to present embodiment, as long as guaranteeing to decode by the coding that sensor 2 is collected, this coding rule can learn that mark 3 sections of living in this purpose in district's can realize, can be applied in this detecting method after the identification.According to the binary sequence coding rule, a district 11, two districts 12, three districts 13, four districts, five districts so ... the area code coding of area code mark 4 after by sensor 2 identification and conversion be 000000001,000000010,000000011,000000100,000000101 respectively just ...Mark off the tooth position of 9 adjacent 2mm in area code mark 4 scopes in section for this reason, width between each tooth position is 2mm, 9 tooth positions can be represented corresponding codes position in 9 area code codings respectively, what the tooth existence was arranged on the tooth position is 0, anodontia existence be 1, a series of double wedges 7 of arranging according to the area code coding in area code mark 4 scopes have just formed well-regulated groove and the bulge loop that constitutes area code mark 4.The area code in one district 11 is encoded to 000000001, in area code mark 4 scopes in the section, does not exist except last tooth position has double wedge 7 so, all has double wedge 7 to exist on other the tooth position; The area code in two districts 12 is encoded to 000000010, does not have double wedge 7 to exist so on the penult tooth position in the area code mark in the section 4; The area code in three districts 13 is encoded to 000000011, does not all have double wedge 7 to exist so on last two the tooth positions in the area code mark in the section 4.Because the spacing of sensor unit 24 is 1mm, and the width of double wedge 7 is 2mm, just guaranteed whether to have on each tooth position double wedge 7 to be detected by at least one sensor unit 24.District's mark 3 in the section is the wide bulge loops of 6mm that are.
A kind of absolute type stroke detecting method that is used in combination with ceramic cylinder rod, the above-mentioned absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod make can draw the current absolute position of sensor 2 in this way.This method is at first utilized each mark of sensor 2 read sensors 2 present positions, learn the position offset of sensor 2 sections of living in and sensor 2 relative sections of living in by the coding that sensor 2 the is collected identification of decoding then, the position offset of sensor 2 section combined sensors 2 of living in section of living in relatively can be drawn the current absolute position of sensor 2.
Thereby be specially by the coding that sensor 2 the is collected process that identification obtains sensor 2 residing absolute positions of decoding in this method:
A, from the coding that sensor 2 reads, identify district coding;
Read the value of current 48 sensor units 24, because district's mark 3 is the bulge loop of 6mm width, having at least 5 adjacent sensors unit 24 to obtain the value of reading so in the sensor 2 is 1, searching this is 1 several sensor units 24 continuously, and these sensor unit 24 resulting codings are distinguished coding exactly.
The coding of B, the coding that will distinguish the coding back and coding front, district calculates and generates the area code coding, determines to belong to which section when proparea mark 3 thus.
Read the high coding of district's coding 3 one sides and the low level coding of opposite side, high coding and the computing of low level coding are connected the area code coding that obtains when proparea mark 3 section positions of living in.With Xiang Yi district 11 directions is the right side, and Xiang San district 13 directions are a left side.The 3 right-hand end unit of encoding from the district that determines begin to the right up to sensor 2 afterbodys, and that reads is the high coding section, and the 3 left end unit of encoding from the district that determines begin left up to sensor 2 heads, and that reads is the low level coding section.For example when sensor 2 is between the 11 He Er districts 12, a district, sensor 2 left sides are in two districts 12, the right is in the district 11, the coding read of sensor 2 right-hand components is exactly the high coding section so, the coding that left-hand component obtains be exactly the low level coding section, the computing of two sections codings is connected the area code coding that obtains the place section afterwards, and promptly current district's mark 3 is in two districts 12.This linking computing is to differ 1 according to the coding of the binary system area code in the adjacent sections.
C, be coded in position in the coding that sensor 2 reads, calculate sensor 2 relatively when the shift offset of proparea mark 3 according to the district;
With sensor 2 leftmost sensor units 24 is position reference, for example: the rightest sensor unit 24 is numbered 1, the most left sensor unit 24 is numbered 48, serial number, district's coding that district's mark 3 is reflected appears at 15-21 sensor unit 24, side-play amount is 15-1=14 so, because spacing is 1mm, side-play amount is exactly 14mm so.
D, according to obtaining the current absolute position of sensor 2 when the shift offset of proparea mark 3 relatively when the residing section combined sensors 2 of proparea mark 3.
According to above-mentioned example, obtained district's mark 3 in two districts 12, the side-play amount of the rightmost relatively sensor unit 24 of district's mark 3 is 14mm.The length of each section is 44mm, and sensor unit 24 positions as benchmark are 1*44mm-14mm=30mm so, can learn the absolute position that sensor 2 is current like this.
Claims (4)
1. absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod, comprise the detection segment on the piston rod (1) and read the sensor (2) of distinguishing mark (3) and area code mark (4) with district's mark (3) and area code mark (4), detection segment on the described piston rod (1) comprises the magnetic conductivity matrix and covers the stupalith of matrix surface, district mark (3) and area code mark (4) are by clocklike groove and bulge loop formation on the detection segment that is arranged on piston rod (1), described sensor (2) is close to piston rod surface or is kept small distance at interval, sensor (2) is an active magnetic detection type, it is characterized in that: mark off corresponding tooth position according to the area code coding in the area code mark (4) in section, corresponding codes position in the area code coding is represented in each tooth position; Mark off the tooth position of 9 adjacent 2mm in area code mark (4) scope in the section, width between each tooth position is 2mm, 9 tooth positions can be represented corresponding codes position in 9 area code codings respectively, what the tooth existence was arranged on the tooth position is 0, anodontia existence be 1, the district's mark (3) in the section is the wide bulge loop of 6mm that is; Described sensor (2) comprises a plurality of multi-joint dress sensors (21), sensor retaining ring (22) and sensor groups pedestal (23), be arranged with several sensor units (24) in the multi-joint dress sensor (21), spacing is 8mm between each sensor unit (24), multi-joint dress sensor (21) is fixed on the sensor groups pedestal (23) by sensor retaining ring (22), adjacent multi-joint dress sensor 21 staggers each other at vertical direction, and multi-joint dress sensor (21) distributes according to vertical direction spacing 1mm; Sensor groups pedestal (23) is identical with the radian of piston rod (1).
2. the absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod according to claim 1, it is characterized in that: the outer housing (5) that is equipped with of described sensor (2), housing (5) is fixed on the end of piston rod oil cylinder, and the holddown spring (6) that is arranged between housing (5) and the sensor (2) is pressed on sensor (2) on the piston rod (1).
3. the method for utilizing the absolute type device for detecting distance of travel that is used in combination with ceramic cylinder rod as claimed in claim 1 or 2 to carry out stroke detection, it is characterized in that: at first piston rod (1) detection segment is divided into a plurality of continuous sections along axial direction, one group echo all is set in each section, one group of unique encoding be discerned and be converted to this group echo can by sensor (2), utilize sensor (2) to read the coding of each mark of current location, learn the position offset of sensor (2) section of living in and the relative section of living in of sensor (2) by the coding that sensor (2) the is collected identification of decoding then, the position offset of sensor (2) section combined sensor of living in (2) section of living in relatively can be drawn the current absolute position of sensor (2).
4. the method for stroke detection according to claim 3, it is characterized in that: a group echo that is provided with in described each section comprises district's mark (3) and area code mark (4), one group of district's coding and one group of unique area code coding that reflects when proparea mark (3) section of living in be discerned and be converted to district's mark (3) and corresponding area code mark (4) thereof can by sensor (2), adjacent area code mark (4) separates by district's mark (3), and the district's mark (3) in each section is unified specification and equidistant the setting; Be specially by the coding that sensor (2) the is read process that identification obtains the residing absolute position of sensor (2) of decoding:
A, from the coding that sensor (2) reads, identify district coding;
The coding of B, the coding that will distinguish the coding back and coding front, district calculates and generates the area code coding, determines to belong to which section when proparea mark (3) thus;
C, be coded in position in the coding that sensor (2) reads, calculate sensor (2) relatively when the shift offset of proparea mark (3) according to the district;
The shift offset that D, basis are worked as proparea mark (3) relatively when the residing section combined sensor of proparea mark (3) (2) obtains the current absolute position of sensor (2).
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| CN2008100248425A CN101280796B (en) | 2008-05-07 | 2008-05-07 | Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use |
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| CN2008100248425A CN101280796B (en) | 2008-05-07 | 2008-05-07 | Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use |
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| CN101280796B true CN101280796B (en) | 2011-09-14 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141059B (en) * | 2011-03-29 | 2013-07-24 | 江苏武进液压启闭机有限公司 | Method for detecting absolute displacement of ceramic piston rod |
| CN102141060B (en) * | 2011-03-29 | 2013-07-24 | 江苏武进液压启闭机有限公司 | Device for detecting absolute displacement of ceramic piston rod |
| 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 |
| CN103114980B (en) * | 2012-06-27 | 2014-11-19 | 中联重科股份有限公司 | Pumping stroke control method of double-cylinder pump and pumping device |
| CN103134454A (en) * | 2013-02-01 | 2013-06-05 | 中联重科股份有限公司 | Position detection method, device and system of rubbish compressor and pushing head |
| CN106197242A (en) * | 2016-08-31 | 2016-12-07 | 江苏武进液压启闭机有限公司 | Absolute stroke detection structure based on piston rod |
| GB2554655B (en) | 2016-09-30 | 2019-10-02 | Caterpillar Inc | A hydraulic actuator arrangement |
| CN107906077A (en) * | 2017-12-15 | 2018-04-13 | 武汉静磁栅机电制造有限公司 | A kind of absolute type ceramic cylinder rod displacement sensor and its measuring method |
| CN110926319A (en) * | 2019-11-14 | 2020-03-27 | 江苏武进液压启闭机有限公司 | Piston rod or damping part positioning device and positioning method based on one-dimensional code |
| CN110926320A (en) * | 2019-11-20 | 2020-03-27 | 常州武宏机械科技有限公司 | Measuring and positioning device and method based on one-dimensional code |
| CN113670344B (en) * | 2021-08-04 | 2024-04-26 | 固高科技股份有限公司 | Encoding and decoding method, encoding and decoding device and encoder of angle encoder |
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| US6922158B2 (en) * | 2001-04-23 | 2005-07-26 | Bosch Rexroth Ag | Hydraulic cylinder with a measuring system for determining the absolute position of the piston rod relative to a reference point |
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| US3956973A (en) * | 1972-07-11 | 1976-05-18 | Basic Aluminum Castings Company | Die casting machine with piston positioning control |
| US6922158B2 (en) * | 2001-04-23 | 2005-07-26 | Bosch Rexroth Ag | Hydraulic cylinder with a measuring system for determining the absolute position of the piston rod relative to a reference point |
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