CN102141059A - Method for detecting absolute displacement of ceramic piston rod - Google Patents
Method for detecting absolute displacement of ceramic piston rod Download PDFInfo
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- CN102141059A CN102141059A CN2011100767927A CN201110076792A CN102141059A CN 102141059 A CN102141059 A CN 102141059A CN 2011100767927 A CN2011100767927 A CN 2011100767927A CN 201110076792 A CN201110076792 A CN 201110076792A CN 102141059 A CN102141059 A CN 102141059A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000003754 machining Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The invention relates to the technical field of stroke detection, in particular to a method for detecting absolute displacement of a ceramic piston rod. The method comprises the following steps of: processing at least two sets of thread grooves on the surface of a piston rod substrate, wherein a thread pitch value of one set of thread groove of which the thread pitch is minimum is taken as a reference value, and the pitch values of other thread grooves are set in the range of the number which is two times the reference value; in the interval from the starting point of each set of thread groove to the part where the at least two sets of the thread grooves are superposed again, detecting the space values of at least one group of thread rings at the piston rod position corresponding to a linear array sensor by using the linear array sensor which is static relative to the piston rod, wherein the space value of the thread rings is that of adjacent thread rings in the group of the thread rings, so that the current absolute position of the linear array sensor at the ceramic piston rod can be obtained uniquely. Compared with the conventional related technical scheme, the method for detecting the absolute displacement of the ceramic piston rod has the advantages of simple and convenient implementation process, easy maintenance, extremely small influence on equipment, large detection threshold value, and high accuracy.
Description
Technical field
The present invention relates to the stroke detection technical field, refer in particular to a kind of detecting method of ceramic cylinder rod absolute displacement.
Background technique
The built-in stroke detecting method that present oil hydraulic cylinder is adopted roughly has following several: a kind of is to adopt mangneto formula Linear displacement transducer, detect 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; In addition, it must and can only be installed on oil hydraulic cylinder loam cake napex, 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 kind is to adopt 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 that method adopted, and 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 is time-consuming.Also having a kind of method is to adopt the built-in device for detecting distance of travel of incremental, 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, the size of magnetic resistance just causes the power in magnetic field, sensor is by power that detects magnetic field and the power that converts electric current to, and 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 method is compared the technical very big progress that had with preceding two kinds of methods, but have following shortcoming: the fluting processing to the piston rod matrix must be used special device, bite to the piston rod matrix is bigger, intensity to piston rod exerts an influence, piston rod matrix surface groove is more, increased the consumption of ceramic spraying material more deeply, and influences the adhesion of ceramic coating.
Summary of the invention
The technical problem to be solved in the present invention is: disclose a kind of detecting method of ceramic cylinder rod absolute displacement, this detecting method is compared advantage with existing related art scheme and is, implementation process is easy, easy care, minimum to equipment influence, testing precision is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of detecting method of ceramic cylinder rod absolute displacement, ceramic cylinder rod is formed by the ceramic coated layer of piston rod surface, detecting method is as follows: at piston rod matrix surface processing at least two thread die cutting grooves, with the pitch value of a thread die cutting groove of pitch minimum wherein as reference value, the pitch value of other thread grooves is within the twice number range of reference value, from the starting point of each thread die cutting groove to the interval that each thread die cutting groove overlaps once more, the utilization line array sensor static with respect to piston rod detects at least one group of fillet of screw distance values from current its pairing piston rod position, fillet of screw distance values promptly should be organized the distance values of adjacent thread circle in the fillet of screw, thereby obtain uniquely line array sensor current on piston rod residing absolute position, also just obtained the absolute displacement value of piston rod.Detection side's ratio juris of this ceramic cylinder rod absolute displacement is: at piston rod surface, identical each the thread die cutting groove of machining starting point from starting point in this section zone that overlaps once more, the fillet of screw of each thread die cutting groove on each circle distance to each other is a unique particular value, line array sensor can detect one group of fillet of screw distance values at least, the unit interval and the resolution that cooperate sensor, to accurately detect sensor current on ceramic cylinder rod residing absolute position, thereby also just obtained the absolute displacement value of ceramic cylinder rod.
Say that further described line array sensor has been used ultrasonic phased array probe.The present accessible characteristic of ultrasonic phased array probe: frequency of okperation 1Mhz～7.5Mhz (can reach 10Mhz), piezoelectric material mostly is composite material, the employing organic polymer piezoelectric material that also has, size can reach 0.8mm*0.8mm or littler, piezoelectric unit number 16-256, at present common is Unit 16,32,64 and 128, and the piezoelectric unit minimum interval can reach 0.1mm.
The invention has the beneficial effects as follows: the detecting method of this ceramic cylinder rod absolute displacement is compared with existing related art scheme, have that implementation process is easy, easy care, minimum to the equipment influence, detect the big advantage of high precision of thresholding.Specifically, the thread groove on the piston rod is processed as conventional processing, adopts engine lathe just can finish, and need not to use automation equipment to handle; Sensor is easy for installation; Thread groove processing reduces more to the bite of piston rod surface than the ceramic cylinder rod that adopts the built-in device for detecting distance of travel of incremental, this just helps improving the adhesion of piston rod surface ceramic layer greatly, save the consumption of ceramic spraying material simultaneously, therefore thread groove processing is also minimum to the influence of piston rod intensity less owing to bite; For choosing of thread groove pitch on the piston rod, the combination of thread groove pitch is suitable can easily to mark the length numerical value that covers present hydraulic applications all length scope, and guarantees to cooperate with the effective of sensor; Sensor is selected ultrasonic phased array probe for use, cooperates its unit interval and resolution, and system can reach more than the 1mm the testing precision of ceramic cylinder rod absolute displacement.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the scheme implementation diagram of the detecting method of ceramic cylinder rod absolute displacement of the present invention.
Fig. 2 is the detection sign picture of the detecting method of ceramic cylinder rod absolute displacement of the present invention.
Among the figure: 1. piston rod 2. thread grooves 3. line array sensors
Embodiment
A kind of detecting method of ceramic cylinder rod absolute displacement, ceramic cylinder rod is formed by the ceramic coated layer in piston rod 1 surface, detecting method is as follows: at the identical thread groove 2 of piston rod 1 matrix surface processing at least two cover starting points, with the pitch value of a thread die cutting groove 2 of pitch minimum wherein as reference value, the pitch value of other thread grooves 2 is within the twice number range of reference value, from the starting point of each thread die cutting groove 2 to the interval that each thread die cutting groove 2 overlaps once more, utilization goes out at least one group of fillet of screw distance values with respect to piston rod 1 static line array sensor 3 from current its pairing piston rod 1 position probing, fillet of screw distance values promptly should be organized the distance values of adjacent thread circle in the fillet of screw, thereby obtain uniquely line array sensor 3 current on piston rod 1 residing absolute position, also just obtained the absolute displacement value of piston rod 1.Line array sensor 3 has been used ultrasonic phased array probe, the present accessible characteristic of ultrasonic phased array probe: frequency of okperation 1Mhz～7.5Mhz (can reach 10Mhz), piezoelectric material mostly is composite material, the employing organic polymer piezoelectric material that also has, size can reach 0.8mm*0.8mm or littler, piezoelectric unit number 16-256, at present common is Unit 16,32,64 and 128, and the piezoelectric unit minimum interval can reach 0.1mm.
Detection side's ratio juris of this ceramic cylinder rod absolute displacement is: at piston rod surface, identical each the thread die cutting groove of machining starting point from starting point in this section zone that overlaps once more, the fillet of screw each other the spacing of each thread die cutting groove on each circle is a unique particular value, line array sensor can detect one group of fillet of screw distance values at least, the unit interval and the resolution that cooperate sensor, to accurately detect sensor current on ceramic cylinder rod residing absolute position, thereby also just obtained the absolute displacement value of ceramic cylinder rod.
If at the identical thread groove 2 of piston rod 1 surface Machining, two cover starting points, the pitch of two thread die cutting grooves 2 is taken as 50mm and 51mm respectively, but this two thread die cuttings groove 2 length of mark on ceramic cylinder rod is 2550mm so, i.e. the least common multiple of two thread die cutting grooves, 2 pitch.
If at the identical thread groove 2 of piston rod 1 surface Machining, three cover starting points, the pitch of three thread die cutting grooves 2 is taken as 50mm, 51mm, 53mm successively, select this three thread die cuttings groove 2, then but the length of mark is 135150mm on ceramic cylinder rod, and this numerical value has covered all length scope of present hydraulic applications.
Provide a test example below in conjunction with diagram (Fig. 2).
Referring to Fig. 2, piston rod 1 surface Machining two thread die cutting grooves 2, pitch is represented with A, B in scheming respectively, A=51mm, B=50mm, thread groove 2 groove widths are 2mm, line array sensor 3 left side first modules are sensor reference position point.The space D that predicts of current distance sensor reference position point is 9.76mm, wherein 0.76mm is that sensor axis does not overlap with thread groove 2 machining starting points and caused, deduct groove width 2mm again, obtain two fillet of screw spacing d=7mm, because of two thread groove pitch differences are 1mm, sensor is now near the 7th road fillet of screw of piston rod as can be known.Sensor reference position point is that the distance of nearest one fillet of screw of the thread groove of B is P from pitch, and then can obtaining sensor reference position point, to be in current piston rod position be the 7*B+P place.
Claims (2)
1. the detecting method of a ceramic cylinder rod absolute displacement, ceramic cylinder rod is formed by the ceramic coated layer in piston rod (1) surface, it is characterized in that method is: at piston rod (1) matrix surface processing at least two thread die cutting grooves (2), with the pitch value of a thread die cutting groove (2) of pitch minimum wherein as reference value, the pitch value of other thread grooves (2) is within the twice number range of reference value, the utilization line array sensor (3) static with respect to piston rod (1) goes out at least one group of fillet of screw distance values from current its pairing piston rod (1) position probing, fillet of screw distance values promptly should be organized the distance values of adjacent thread circle in the fillet of screw, thereby it is current in the last residing absolute position of piston rod (1) to obtain line array sensor (3) uniquely, has also just obtained the absolute displacement value of piston rod (1).
2. the detecting method of ceramic cylinder rod absolute displacement according to claim 1 is characterized in that: described line array sensor (3) has been used ultrasonic phased array probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110076792 CN102141059B (en) | 2011-03-29 | 2011-03-29 | Method for detecting absolute displacement of ceramic piston rod |
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| CN 201110076792 CN102141059B (en) | 2011-03-29 | 2011-03-29 | Method for detecting absolute displacement of ceramic piston rod |
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| CN102141059B CN102141059B (en) | 2013-07-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579180A (en) * | 1983-05-18 | 1986-04-01 | Hawera Probst Gmbh And Co. | Drilling bit |
| US5800524A (en) * | 1994-12-16 | 1998-09-01 | Bard Galway Limited | Prosthesis with spiral stitching element |
| CN101280796A (en) * | 2008-05-07 | 2008-10-08 | 江苏武进液压启闭机有限公司 | Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use |
| CN101852884A (en) * | 2010-07-01 | 2010-10-06 | 华中科技大学 | A double helix metal wire grid circular polarizer |
-
2011
- 2011-03-29 CN CN 201110076792 patent/CN102141059B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579180A (en) * | 1983-05-18 | 1986-04-01 | Hawera Probst Gmbh And Co. | Drilling bit |
| US5800524A (en) * | 1994-12-16 | 1998-09-01 | Bard Galway Limited | Prosthesis with spiral stitching element |
| CN101280796A (en) * | 2008-05-07 | 2008-10-08 | 江苏武进液压启闭机有限公司 | Absolute type stroke detecting method and apparatus combing with ceramic cylinder rod to use |
| CN101852884A (en) * | 2010-07-01 | 2010-10-06 | 华中科技大学 | A double helix metal wire grid circular polarizer |
Non-Patent Citations (1)
| Title |
|---|
| 周亮等: "基于CCD线阵的航空液压附件位移测量装置", 《电子测量技术》 * |
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Inventor after: Lv Weidong Inventor after: Liu Qingsong Inventor after: Wu Guodong Inventor after: Gao Jiyuan Inventor after: Zhu Qinyu Inventor after: Peng Zhekai Inventor after: Wang Shuangyun Inventor before: Wu Guodong Inventor before: Gao Jiyuan Inventor before: Zhu Qinyu Inventor before: Peng Zhekai Inventor before: Wang Shuangyun |
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Free format text: CORRECT: INVENTOR; FROM: WU GUODONG GAO JIYUAN ZHU QINYU PENG ZHEKAI WANG SHUANGYUN TO: LV WEIDONG LIU QINGSONG WU GUODONG GAO JIYUAN ZHU QINYU PENG ZHEKAI WANG SHUANGYUN |
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Denomination of invention: Detection method for absolute displacement of ceramic piston rod Effective date of registration: 20231213 Granted publication date: 20130724 Pledgee: Industrial and Commercial Bank of China Changzhou New Area Branch Pledgor: Jiangsu Wujin Hydraulic Hoist Co.,Ltd. Registration number: Y2023980070791 |
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