CN109916288B - Differential transformer type linear displacement sensor - Google Patents
Differential transformer type linear displacement sensor Download PDFInfo
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- CN109916288B CN109916288B CN201910282973.1A CN201910282973A CN109916288B CN 109916288 B CN109916288 B CN 109916288B CN 201910282973 A CN201910282973 A CN 201910282973A CN 109916288 B CN109916288 B CN 109916288B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 25
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
The invention discloses a differential transformer type linear displacement sensor, which comprises a base, wherein the base comprises a flange, a rod body coaxially connected with the flange is arranged on the flange, an inner hole penetrating through the rod body is formed in the flange, and an armature assembly is coaxially sleeved in the inner hole; the zero-position gasket and the pipe body are sequentially sleeved on the rod body, the shell is coaxially sleeved on the pipe body, the shielding gasket and the two framework components are sequentially arranged in the shell, the two framework components are separated and positioned by a limiting sleeve, the gasket, the end cover and the fastening piece are sequentially sleeved at one end of the pipe body, which is away from the flange, the gasket is tightly attached to the framework component, the fastening piece is in threaded connection with the tail end of the rod body and is used for fixing the position of the end cover, the framework component is connected with a wire, and the wire is led out through a wire outlet hole formed in the shell. The invention realizes the miniaturization requirement, simultaneously reduces the influence of the armature on the valve core to the minimum, has small debugging workload, improves the working efficiency, has strong practicability and is worthy of popularization.
Description
Technical Field
The invention belongs to the technical field of detection equipment, and particularly relates to a differential transformer type linear displacement sensor.
Background
At present, displacement sensors are arranged on electro-hydraulic servo valves and used for measuring valve core displacement and providing parameters for system fault diagnosis and prevention, but the traditional dual-redundancy displacement sensors are limited in installation position due to the fact that parallel structures are adopted, and meanwhile, due to the fact that the structures of fixed coils are adopted, debugging processes are complex, and labor cost and economic cost are increased.
The displacement sensor of the partial dual-redundancy differential transformer adopts a series structure, but the structure is a fixed ring structure, namely the sensor body is fixed, and in the early assembly and debugging process, the consistency of the zero position of the valve core and the zero position of the sensor output needs to be realized by adjusting the position of the armature relative to the valve core, but the valve body is internally provided with high-pressure, and repeated disassembly and pressurization are needed. Moreover, the electro-hydraulic servo valve has abrasion on a valve core after a period of working, zero offset can be caused, the electro-hydraulic servo valve is disassembled again for adjustment during zero correction, and meanwhile, the electro-hydraulic servo valve is required to be processed in an ultra-clean factory due to high requirement on the assembly and debugging environment of the electro-hydraulic servo valve, so that the electro-hydraulic servo valve is required to be returned to the factory for processing, and the maintenance workload is huge.
Disclosure of Invention
In view of the above, the present invention provides a differential transformer type linear displacement sensor to solve the shortcomings of the prior art.
The technical scheme of the invention is as follows:
the differential transformer type linear displacement sensor comprises a base, wherein the base comprises a flange, a rod body coaxially connected with the flange is arranged on the flange, an inner hole penetrating through the rod body is formed in the flange, and an armature assembly connected with a valve core of an external electro-hydraulic servo valve is coaxially sleeved in the inner hole; the novel high-strength steel wire rope is characterized in that a zero-position gasket and a tube body are sequentially sleeved on the rod body, a shell is coaxially sleeved on the tube body, a shielding gasket and two framework components are sequentially arranged in the shell, the two framework components are separated and positioned by a limiting sleeve, one end of the tube body deviating from a flange is further sequentially sleeved with a gasket, an end cover and a fastening piece, the gasket is tightly attached to the framework components, the fastening piece is in threaded connection with the tail end of the rod body and is used for fixing the position of the end cover, a wire is connected to the framework components, and the wire is led out through a wire outlet hole formed in the shell.
Preferably, the periphery of the skeleton assembly is provided with a shielding shell.
Preferably, the tightening member is a fixing nut.
Preferably, the skeleton assembly comprises a skeleton, a winding made of enameled wires is wound on the skeleton, the inlet and outlet ends of the winding are respectively connected with a high-temperature wire, and a high-temperature adhesive tape is wound on the periphery of the winding.
Preferably, two outgoing line shells are symmetrically arranged on the shell, the outgoing line shells are fixedly connected with the shell respectively, and the outgoing line shells are aligned with the outgoing line holes.
Preferably, the armature assembly comprises an armature connecting shaft, the two ends of the armature connecting shaft are sequentially sleeved and fixed with armatures, an armature gasket is arranged between the armatures and the armature connecting shaft, and one end of one armature is sleeved and fixed with a valve core of an external electrohydraulic servo valve.
Preferably, insulating glue is poured between the framework component and the end cover and in the two outgoing line shells.
Preferably, casting glue is poured between the two framework components.
Compared with the prior art, the differential transformer type linear displacement sensor provided by the invention has the advantages that the diameter size of the sensor is reduced by 50% due to the adoption of a serial structure and only one armature connecting shaft, meanwhile, two armatures are connected together through the armature connecting shaft, and two groups of coils are connected in series, so that dual-redundancy displacement measurement is realized, and meanwhile, the length size of the sensor is increased by 20% compared with that of a single Yu Du sensor by adopting a tower winding process. On the premise of meeting the unchanged technical indexes, the serial dual-redundancy structure is adopted, so that the mounting area of the sensor is reduced, the structural size and the mass (rotational inertia) of the armature are reduced, the miniaturization requirement is realized, and the influence of the armature on the valve core is minimized. The invention adopts the moving coil structure, reduces the workload of debugging and installation, and can be installed and used on various electrohydraulic servo valves. The moving coil type structure divides the sensor into two bodies, when the sensor is installed on the servo valve, the armature and the valve core are fixed together, the high pressure inside the servo valve is isolated through the installation base, the zero position of the valve core and the adjustment of the zero position of the sensor output can be realized through adjusting the relative positions of the sensor and the installation base, the repeated disassembly of the valve body structure and the pollution of the valve body brought about are avoided, the debugging workload is greatly reduced, and meanwhile, the zero offset brought about by the abrasion of the valve core can be timely processed on the working site, the economic cost caused by time waste is reduced, the working efficiency is improved, the practicability is high, and the valve is worth popularizing.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is a left side view of the overall structure of the present invention;
FIG. 3 is a rear elevational view of the overall structure of the present invention;
FIG. 4 is a top view of the overall structure of the present invention;
FIG. 5 is a schematic structural view of a skeleton assembly of the present invention;
fig. 6 is a schematic structural view of an armature assembly of the present invention;
FIG. 7 is a front view of the structure of the base of the present invention;
fig. 8 is a left side view of the structure of the base of the present invention.
Reference numerals:
1. an end cap; 2. a housing; 3. a shield case; 4. a skeleton assembly; 41. a teflon heat-shrinkable tube; 42. a skeleton; 43. a high temperature wire; 44. a polytetrafluoroethylene tube; 45. enamelled wires; 46. high temperature adhesive tape; 5. a base; 51. a rod body; 52. a flange; 53. an inner bore; 6. zero position gaskets; 7. a shielding gasket; 8. slotted cylinder head screw; 9. a small flat pad; 10. a spring pad; 11. a wire outlet housing; 12. a limit sleeve; 13. an armature assembly; 131. an armature; 132. armature shims; 133. an armature connecting shaft; 14. a conduit; 15. a gasket; 16. and (5) fixing a nut.
Detailed Description
The present invention provides a differential transformer type linear displacement sensor, and the present invention will be described with reference to the schematic structural diagrams of fig. 1 to 8.
Example 1:
as shown in fig. 1 to 4, a differential transformer type linear displacement sensor comprises a base 5, as shown in fig. 7 to 8, wherein the base 5 comprises a flange 52, a rod body 51 coaxially connected with the flange 52 is arranged on the flange 52, an inner hole 53 penetrating through the rod body 51 is formed in the flange 52, and an armature assembly 13 connected with a valve core of an external electrohydraulic servo valve is coaxially sleeved in the inner hole 53; the zero-position gasket 6 and the pipe body 14 are sequentially sleeved on the pipe body 51, the shell 2 is coaxially sleeved on the pipe body 14, the shielding gasket 7 and the two framework components 4 are sequentially arranged in the shell 2, the two framework components 4 are separated and positioned by the limiting sleeve 12, one end of the pipe body 14 deviating from the flange 52 is further sequentially sleeved with the gasket 15, the end cover 1 and the fastening piece, the gasket 15 is tightly attached to the framework components 4, the fastening piece is in threaded connection with the tail end of the pipe body 51 and is used for fixing the position of the end cover 1, a wire is connected to the framework components 4, and the wire is led out through a wire outlet hole formed in the shell 2.
As a further optimization on the basis of the above, the outer periphery of the skeleton assembly 4 is provided with a shield shell 3.
As a further optimization on the basis of the above, the tightening piece is a fixing nut 16.
As a further optimization based on the above, as shown in fig. 5, the skeleton assembly 4 comprises a skeleton 42, a winding made of enameled wires 45 is wound on the skeleton 42, the wire inlet and outlet ends of the winding are respectively connected with a high-temperature wire 43, and a high-temperature adhesive tape 46 is wound on the periphery of the winding.
As a further optimization based on the above, two wire outlet shells 11 are symmetrically arranged on the shell 2, the wire outlet shells 11 are fixedly connected with the shell 2 respectively, and the wire outlet shells 11 are aligned with the wire outlet holes.
As a further optimization based on the above, as shown in fig. 6, the armature assembly 13 includes an armature connecting shaft 133, two ends of the armature connecting shaft 133 are sequentially sleeved with and fixed to the armature 131, an armature gasket 132 is disposed between the armature 131 and the armature connecting shaft 133, and one end of one armature 131 is sleeved and fixed with a valve core of an external electrohydraulic servo valve.
As a further optimization on the basis, insulating glue, in particular 906-type insulating pouring sealant, is poured between the framework component 4 and the end cover 1 and in the two wire outlet shells 11.
Wherein, the insulating glue is poured through the pouring opening 1.
As a further optimization on the basis of the above, the casting glue, in particular the CH-311 casting glue, is poured between the two skeleton members 4.
Wherein, slotted cylinder head screw 8, small flat pad 9 and spring pad 10 are used for assisting the fixed end cover 1.
Wherein, two skeleton subassembly 4 all are the suit on the body of rod 51, are provided with spacing sleeve 12 in the middle, and spacing sleeve 12 also is the suit on the body of rod 51, mainly used separates two skeleton subassemblies 4, carries out spacingly to two skeleton subassemblies 4 simultaneously.
The space formed by the limit sleeve 12, the two skeleton assemblies 4 and the shell 2 is filled with casting glue through the filling port 2.
The invention provides a differential transformer type linear displacement sensor, wherein an armature assembly 13 in the sensor is connected with a valve core of an external electrohydraulic servo valve, the movement of the armature assembly is synchronous with the valve core of the external electrohydraulic servo valve, and when the position of the valve core of the external electrohydraulic servo valve is changed, the position of the armature assembly 13 is also synchronously changed.
The armature assembly 13 includes two armatures 131 connected through an armature connecting shaft 133, and in the early assembly and debugging process, the positions of the armature assembly 13 need to be adjusted to achieve the consistency of the zero position of the valve core and the zero position of the sensor output, that is, the positions of the armature assembly 13 need to be adjusted to enable the geometric center positions of the two armatures 131 to be respectively consistent with the geometric center positions of the skeleton assembly 4 corresponding to the positions of the two armatures.
When the electrohydraulic servo valve works for a period of time, the valve core is worn, at the moment, the geometric center positions of the two armatures 131 cannot be respectively consistent with the geometric center positions of the skeleton assemblies 4 corresponding to the positions of the two armatures, so that zero offset is caused, and zero correction is needed at the moment, namely, the base 5 of the electrohydraulic servo valve is detached, and the relative positions of the armature assemblies 13 are adjusted by adopting means of adding gaskets between the armatures 131 and the valve core, so that the geometric center positions of the two armatures 131 are respectively consistent with the geometric center positions of the skeleton assemblies 4 corresponding to the positions of the two armatures 131.
The shell of the invention is internally provided with two components with transformer structures, each component comprises a framework component 4, two windings wound on the framework component 4, an internal armature and other structures to form a linear displacement sensor, the phases of the output of the two windings wound on the framework component 4 are opposite, the components with the two transformer structures are separated by a limit sleeve 12 and respectively and independently work, when one of the components fails, the other component can be used for continuing to work, and the reliability of the system is improved as a whole.
When the position of the armature assembly 13 can ensure the consistency of the zero position of the valve core and the zero position of the output of the sensor, the linear displacement sensors of the two transformer structures can work independently and normally.
In the working state of the linear displacement sensor of the transformer structure, when the geometric center position of the armature 131 is consistent with the geometric center position of the skeleton assembly 4 corresponding to the position of the armature, the output zero of the sensor is zero, and when the geometric center position of the armature 131 is inconsistent with the geometric center position of the skeleton assembly 4 corresponding to the position of the armature, the output of the sensor is the difference value of the outputs of the left and right independent windings.
The differential transformer type linear displacement sensor provided by the invention adopts a serial structure, only one armature connecting shaft is adopted to reduce the diameter size of the sensor by 50%, meanwhile, two armatures are connected together through the armature connecting shaft, two groups of coils are connected in series, dual-redundancy displacement measurement is realized, and meanwhile, a tower-type winding process is adopted to increase the length size of the sensor by 20% compared with that of a single Yu Du sensor.
On the premise of meeting the unchanged technical indexes, the serial dual-redundancy structure is adopted, so that the mounting area of the sensor is reduced, the structural size, the mass and the rotational inertia of the armature are reduced, the miniaturization requirement is realized, and the influence of the armature on the valve core is minimized.
The invention adopts the moving coil structure, reduces the workload of debugging and installation, and can be installed and used on various electrohydraulic servo valves. The moving coil type structure divides the sensor into two bodies, when the sensor is installed on the servo valve, the armature and the valve core are fixed together, the high pressure inside the servo valve is isolated through the installation base, the adjustment of the zero position of the valve core and the zero position of the output of the sensor can be realized through adjusting the relative positions of the sensor and the installation base, the repeated disassembly of the valve body structure and the pollution of the valve body brought by the valve body are avoided, the debugging workload is greatly reduced, and meanwhile, the zero offset brought by the abrasion of the valve core can be timely processed on a working site, the economic cost caused by time waste is reduced, the working efficiency is improved, the practicability is strong, and the valve is worth popularizing.
The foregoing disclosure is merely illustrative of preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations within the scope of the present invention will be within the scope of those skilled in the art.
Claims (5)
1. The differential transformer type linear displacement sensor is characterized by comprising a base (5), wherein the base (5) comprises a flange (52), a rod body (51) coaxially connected with the flange (52) is arranged on the flange (52), an inner hole (53) penetrating through the rod body (51) is formed in the flange (52), and an armature assembly (13) connected with a valve core of an external electrohydraulic servo valve is coaxially sleeved in the inner hole (53); the zero-position gasket (6) and the pipe body (14) are sequentially sleeved on the rod body (51), the shell (2) is coaxially sleeved on the pipe body (14), the shielding gasket (7) and the two framework components (4) are sequentially arranged in the shell (2), the two framework components (4) are separated and positioned by the limiting sleeve (12), one end of the pipe body (14) deviating from the flange (52) is further sequentially sleeved with the gasket (15), the end cover (1) and the fastening piece, the gasket (15) is tightly attached to the framework components (4), the fastening piece is in threaded connection with the tail end of the rod body (51) and is used for fixing the position of the end cover (1), and a wire is connected to the framework components (4) and is led out through a wire outlet hole formed in the shell (2); the periphery of the framework component (4) is provided with a shielding shell (3); the framework component (4) comprises a framework (42), a winding made of enameled wires (45) is wound on the framework (42), the inlet and outlet ends of the winding are respectively connected with a high-temperature wire (43), and a high-temperature adhesive tape (46) is wound on the periphery of the winding; the armature assembly (13) comprises an armature connecting shaft (133), two ends of the armature connecting shaft (133) are sequentially sleeved and fixed with armatures (131), an armature gasket (132) is arranged between the armatures (131) and the armature connecting shaft (133), and one end of one armature (131) is sleeved and fixed with a valve core of an electro-hydraulic servo valve arranged outside.
2. A differential transformer type linear displacement sensor according to claim 1, wherein the tightening member is a fixing nut (16).
3. A differential transformer type linear displacement transducer according to claim 2, wherein two wire outlet housings (11) are symmetrically arranged on the housing (2), the wire outlet housings (11) are fixedly connected with the housing (2) respectively, and the wire outlet housings (11) are aligned with wire outlet holes.
4. A differential transformer type linear displacement sensor according to claim 1, wherein insulating glue is filled between the skeleton assembly (4) and the end caps (1) and in the two outgoing line housings (11).
5. A differential transformer type linear displacement sensor according to claim 1, wherein casting glue is poured between the two frame members (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910282973.1A CN109916288B (en) | 2019-04-10 | 2019-04-10 | Differential transformer type linear displacement sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910282973.1A CN109916288B (en) | 2019-04-10 | 2019-04-10 | Differential transformer type linear displacement sensor |
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| Publication Number | Publication Date |
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| CN109916288A CN109916288A (en) | 2019-06-21 |
| CN109916288B true CN109916288B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910282973.1A Active CN109916288B (en) | 2019-04-10 | 2019-04-10 | Differential transformer type linear displacement sensor |
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|---|---|---|---|---|
| JP2002090106A (en) * | 2000-09-18 | 2002-03-27 | Nippon Soken Inc | Differential transformer type displacement sensor |
| KR20040055747A (en) * | 2004-05-14 | 2004-06-26 | 전계록 | LVDT using double coil type |
| CN102175128A (en) * | 2011-01-24 | 2011-09-07 | 西安旭彤电子科技有限公司 | Differential transformer type line displacement sensor and manufacture and use methods thereof |
| CN203552896U (en) * | 2013-09-17 | 2014-04-16 | 精量电子（深圳）有限公司 | Linear variable differential transducer |
| CN203614901U (en) * | 2013-12-04 | 2014-05-28 | 中国航空工业第六一八研究所 | Connecting structure of iron core and valve element of electro-hydraulic servo valve displacement sensor |
| CN203690083U (en) * | 2014-01-10 | 2014-07-02 | 上海华银电器有限公司 | Solenoid type differential transformer for elevator load weighing device |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| CN107910171A (en) * | 2013-09-17 | 2018-04-13 | 精量电子（深圳）有限公司 | Linear variable difference transformer |
| CN108286932A (en) * | 2018-02-28 | 2018-07-17 | 陕西驰诺电子科技有限公司 | A kind of high-precision two-part differential transformer displacement sensor |
| CN209588968U (en) * | 2019-04-10 | 2019-11-05 | 西安西灵传感技术有限公司 | A kind of differential transformer type linear movement pick-up |
-
2019
- 2019-04-10 CN CN201910282973.1A patent/CN109916288B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090106A (en) * | 2000-09-18 | 2002-03-27 | Nippon Soken Inc | Differential transformer type displacement sensor |
| KR20040055747A (en) * | 2004-05-14 | 2004-06-26 | 전계록 | LVDT using double coil type |
| CN102175128A (en) * | 2011-01-24 | 2011-09-07 | 西安旭彤电子科技有限公司 | Differential transformer type line displacement sensor and manufacture and use methods thereof |
| CN203552896U (en) * | 2013-09-17 | 2014-04-16 | 精量电子（深圳）有限公司 | Linear variable differential transducer |
| CN107910171A (en) * | 2013-09-17 | 2018-04-13 | 精量电子（深圳）有限公司 | Linear variable difference transformer |
| CN203614901U (en) * | 2013-12-04 | 2014-05-28 | 中国航空工业第六一八研究所 | Connecting structure of iron core and valve element of electro-hydraulic servo valve displacement sensor |
| CN203690083U (en) * | 2014-01-10 | 2014-07-02 | 上海华银电器有限公司 | Solenoid type differential transformer for elevator load weighing device |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| CN108286932A (en) * | 2018-02-28 | 2018-07-17 | 陕西驰诺电子科技有限公司 | A kind of high-precision two-part differential transformer displacement sensor |
| CN209588968U (en) * | 2019-04-10 | 2019-11-05 | 西安西灵传感技术有限公司 | A kind of differential transformer type linear movement pick-up |
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