CN104454890B - Servo adjusting screw and machining method thereof - Google Patents
Servo adjusting screw and machining method thereof Download PDFInfo
- Publication number
- CN104454890B CN104454890B CN201410713125.9A CN201410713125A CN104454890B CN 104454890 B CN104454890 B CN 104454890B CN 201410713125 A CN201410713125 A CN 201410713125A CN 104454890 B CN104454890 B CN 104454890B
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- Prior art keywords
- dome
- circle
- adjusting screw
- rivet nut
- servo
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- 238000000034 method Methods 0.000 title claims description 8
- 238000003754 machining Methods 0.000 title description 8
- 238000012545 processing Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000011265 semifinished product Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 10
- 230000035515 penetration Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005121 nitriding Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 208000029278 non-syndromic brachydactyly of fingers Diseases 0.000 description 5
- 238000003672 processing method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
- F16B35/044—Specially-shaped ends
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Transmission Devices (AREA)
Abstract
A servo adjusting screw comprises a screw body. An external thread is arranged at the outer portion of the upper end of the screw body. An inner hexagon is arranged at the inner portion of the upper end of the screw body, a one-level supporting base circle and a two-level supporting base circle are arranged below the external thread, an upper positioning protruding circle is arranged between the one-level supporting base circle and the two-level supporting base circle, and an eccentric circle is arranged at the lower portion of the two-level supporting base circle. A lower positioning protruding circle is arranged at the bottom end of the screw body, and a three-level supporting base circle is arranged between the eccentric circle and the lower positioning protruding circle. In addition, the eccentric circle offsets relative to a rotation center formed by the upper positioning protruding circle and the lower positioning protruding circle. A feedback rod and a servo valve sleeve are centered relative to a servo cylinder and a control valve element in time through the eccentric circle, and therefore it is guaranteed that the servo cylinder is kept relatively still when the control valve element is under the normal state, and then the stability of the servo control system is achieved. The two ends of the screw body are positioned through short pins, and the quality of the screw body is effectively improved. Components of the screw body are assembled according to the set assembling gap and size, and the service life of the servo adjusting screw can be prolonged.
Description
Technical field
The present invention relates to servo-control system technical field, more particularly, to a kind of servo adjusting screw and its processing method.
Background technology
Servo valve directly affects the precision of whole control system as the core conversion element of servo-control system, its performance
And stability, adjusting screw is installed on servo valve body, for adjusting feedback rod and being installed on the servo valve at feedback rod bulb end
Set.But in running, feedback rod and servo valve pocket with respect to servoBcylinder and control the position of valve element to be in deviation state,
It cannot be guaranteed that controlling servoBcylinder under valve element normality to keep geo-stationary, thus affecting the stability of servo-control system；Simultaneously because
Rivet nut is longer, and easily deforms in heat treatment process, has a strong impact on the quality of rivet nut.Additionally, assembling in adjusting screw
Cheng Zhong, the fit-up gap between each assembly and size are also equal important, and fit-up gap is excessive, the noise producing during operation
Greatly, not only cause environmental pollution, and affect the transmission performance between each assembly；Equipment gap is too small, directly results in tune
Whole screw intraware damages.
Content of the invention
Technical problem solved by the invention is to provide a kind of servo adjusting screw and its processing method, above-mentioned to solve
Shortcoming in background technology.
Technical problem solved by the invention employs the following technical solutions to realize：
Servo adjusting screw, including rivet nut, rivet nut is provided with external screw thread outside upper end, connects fastening for loading valve body,
Upper end is internally provided with interior hexagonal, for rotating adjusting screw, and externally threaded lower section is provided with one level of support basic circle and two
Level supports basic circle, and supports in one level of support basic circle and two grades and be provided with top positioning dome between basic circle, two grades of support basic circles
Lower section is provided with the off-centre operation for installing feedback rod；Rivet nut bottom is provided with bottom positioning dome, and off-centre operation is fixed with bottom
It is provided with three-level between the dome of position and supports basic circle, basic circle is supported by setting, cooperation completes locating and machining；Additionally, off-centre operation phase
The centre of gyration becoming for top positioning dome and bottom positioning convexity is bias, and offset is 0.55～0.75mm；Pass through
Off-centre operation in time will be placed in the middle with respect to the position of servoBcylinder and control valve element to feedback rod and servo valve pocket, thus ensureing to control valve element
Under normality, servoBcylinder keeps geo-stationary.
In the present invention, it is additionally provided with interior hexagonal datum hole inside rivet nut upper end, interior hexagonal is on the basis of interior hexagonal datum hole
Punching press is made.
In the present invention, two grades support basic circle and the excircle dimension of one level of support basic circle to be less than the cylindrical of top positioning dome
Size, top positioning dome is that cooperation positioning is cylindrical, functions as short finger setting.
In the present invention, three-level supports the excircle dimension of basic circle to be less than the excircle dimension that bottom positions dome, and bottom positions
Dome is that cooperation positioning is cylindrical, functions as short finger setting.
In the present invention, because rivet nut is longer, and easily deform in heat treatment process, for avoiding positioning, or produce
The inconvenience factor brought, therefore by the way of the short finger setting in two ends, the quality of rivet nut can be effectively improved.
In the present invention, this adjusting screw need to possess wear-resisting, the corrosion-resistant and characteristic such as impact resistance and toughness, and according to reality
Using needs, part-structure needs higher machining accuracy, top positions dome and bottom position dome dimensional accuracy be-
0.0035mm～-0.015mm, surface roughness is 0.8 μm；The dimensional accuracy of off-centre operation is -0.002mm～-0.012mm, table
Surface roughness is 0.8 μm, and remaining body structure surface is that machining requirements IT6 class precision requires.
Servo adjusting screw processing method, comprises the following steps that：
1) choose matrix material, quenched polishing bar selected by matrix material, processes all semi-finished product setting structures, using double
Power spindle automatic lathe is processed, and obtains adjusting screw base substrate；And in double dynamical main shaft automatic lathe, Production development is installed and takes out
Inspection detector, detects critical size, to ensure the machining accuracy produced in batches, effective control scrappage；And top positioning dome
Stay follow-up allowance for finish with bottom positioning dome, when making adjusting screw base substrate, the centre of gyration of semi-finished product bias basic circle
It is concentric with the centre of gyration that top positions dome, bottom positioning dome forms, external screw thread walks lower deviation, the reality of interior hexagonal datum hole
Border processing dimension is more than inscribed circle size 0.1mm of interior hexagonal, is easy to subsequently interior hexagonal punching, each design considerations of semi-finished product are homogeneous
Secondary property clamping processing obtains, and the relative positional accuracy between each key element is by lathe itself control accuracy；
2) in step 1) in hexagonal in punching on the adjusting screw base substrate that obtains, using external screw thread as positioning during punching
Support；
3) gripping step 1) the middle bottom positioning dome processed, processing semi-finished product bias basic circle acquisition off-centre operation, now partially
The centre of gyration of heart circle and the centre of gyration that top positions dome, bottom positioning dome forms are bias, obtain rivet nut；
4) to step 3) in obtain rivet nut carry out surface gas nitrogen treatment, grinding front surface hardness is not less than
600HV0.2, depth of penetration 0.2mm～0.3mm, depth of penetration must not exceed 0.3mm, it is to avoid local height hardening leads to adjust
Screw loses toughness, in gas nitriding before processing, external screw thread spraying protective layer is protected simultaneously, to avoid external screw thread by gas
Body nitrogenizes after-hardening, leads to screw thread edge to collapse broken；
5) to step 4) in the rivet nut that finishes of surface gas nitrogen treatment, top positioning dome machined thereon and bottom
Positioning dome carries out cylindricalo grinding polish, and top positioning dome and bottom positioning dome are disposable clamping grinding, and right
Off-centre operation carries out rubbing down, and after cylindricalo grinding and rubbing down, hardness is not less than 550HV0.2, and depth of penetration is not less than 0.15mm；
6) after step 5) in after grinding polish finishes, remove the protective layer being sprayed on external screw thread；
7) to step 6) in the rivet nut that finishes of polish and rubbing down flash removed is gone using heat energy mode；
8) to step 7) in go the rivet nut that flash removed finishes to be sampled detecting, sampling observation rate is not less than 5%, and sample detection is
Full inspection；
9) to step 8) in the qualified rivet nut of detection be carried out corrosion protection and go magnetic treatment.
10) to step 9) in be carried out rivet nut outward appearance detection that corrosion protection degaussing is disposed qualified after, encapsulation warehouse-in.
Beneficial effect：The present invention passes through off-centre operation and in time with respect to servoBcylinder and feedback rod and servo valve pocket is controlled valve element
Position placed in the middle, thus ensureing to control servoBcylinder under valve element normality to keep geo-stationary, with the stability of servo-control system；Nail
Body two ends, by the way of short finger setting, effectively improve the quality of rivet nut；Simultaneously according to set fit-up gap between rivet nut part
With size assembling, not only effectively reduce the noise producing when running, and the transmission performance of each assembly can be ensured, and then extend
The service life of servo adjusting screw.
Brief description
Fig. 1 is the front view of presently preferred embodiments of the present invention.
Fig. 2 is the top view of presently preferred embodiments of the present invention.
Fig. 3 is the upward view of presently preferred embodiments of the present invention.
Fig. 4 is presently preferred embodiments of the present invention servo adjusting screw base substrate front view.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
Referring to the servo adjusting screw of Fig. 1～Fig. 3, including in hexagonal datum hole 1, top positioning dome 2, three-level support basic circle
4th, 5, two grades of bottom positioning dome supports basic circle 6, one level of support basic circle 7, external screw thread 8, interior hexagonal 9 and off-centre operation 10.
In the present embodiment, it is provided with external screw thread 8 outside rivet nut upper end, connect fastening for loading valve body, in its upper end
Portion is provided with interior hexagonal datum hole 1 and interior hexagonal 9, and interior hexagonal datum hole 1 machines in turnery processing, and interior hexagonal 9 is in interior hexagonal
Punching press on the basis of datum hole 1 is made, and two grades support basic circle 6 and the excircle dimension setting of one level of support basic circle 7 to position less than top
Dome 2, top positioning dome 2 is that cooperation positioning is cylindrical, and the three-level of lower end supports basic circle 4 cylindrical setting size to be similarly less than bottom
Positioning dome 5, bottom positioning dome 5 is that cooperation positioning is cylindrical, because rivet nut is longer, and can deform in heat treatment process,
For avoiding positioning, and produce the factors bringing, therefore by the way of the short finger setting in two ends, i.e. two grades of support basic circle 6 Hes
One level of support basic circle 7 is less than short pin positioning top positioning dome 2, and three-level supports basic circle 4 to be less than short pin positioning bottom positioning
Dome 5, it is bias that off-centre operation 10 positions dome 2 and the centre of gyration of bottom positioning dome 5 formation with respect to top, and offset is
0.55～0.75mm, feedback rod is installed on off-centre operation 10, and external key rotates adjusting screw by interior hexagonal 9, thus passing through
Off-centre operation 10 adjusts the relative position of feedback rod.
In the present embodiment, this adjusting screw need to possess wear-resisting, the corrosion-resistant and characteristic such as impact resistance and toughness, and according to reality
Border needs higher machining accuracy using needs, part-structure, and top positions dome 2 and bottom positions the dimensional accuracy of dome 5
For -0.0035mm～-0.015mm；The dimensional accuracy of off-centre operation 10 is -0.002mm～-0.012mm；And the rough surface at three
Degree requires to be 0.8 μm, and remaining body structure surface is that machining requirements IT6 class precision requires.
Referring to the servo adjusting screw base substrate of Fig. 4, including in hexagonal datum hole 1, top positioning dome 2, semi-finished product bias base
Circle 3, three-level support basic circle 4,5, two grades of bottom positioning dome to support basic circle 6, one level of support basic circle 7 and external screw thread 8, processed
It is processed in strict accordance with servo adjusting screw base substrate schematic diagram in journey, comprise the following steps that：
1) choose matrix material, quenched polishing bar selected by matrix material, processes all semi-finished product setting structures, using double
Power spindle automatic lathe is processed, and obtains adjusting screw base substrate；And in double dynamical main shaft automatic lathe, Production development is installed and takes out
Inspection detector, detects critical size, to ensure the machining accuracy produced in batches, effective control scrappage；And top positioning dome 2
Position dome 5 with bottom and stay follow-up allowance for finish, when making adjusting screw base substrate, in the revolution of semi-finished product bias basic circle 3
The heart and the centre of gyration that top positions dome 2, bottom positioning dome 5 forms are concentric, and external screw thread 8 walks lower deviation, interior hexagonal base
The reality processing size in hole 1 is more than inscribed circle size 0.1mm of interior hexagonal 9, is easy to subsequently interior hexagonal 9 punching, semi-finished product respectively set
The all disposable clamping processing of meter key element obtains, and the relative positional accuracy between each key element is by lathe itself control accuracy；
2) in step 1) in hexagonal 9 in punching on the adjusting screw base substrate that obtains, using external screw thread 8 as positioning during punching
Support；
3) gripping step 1) the middle bottom positioning dome 5 processed, processing semi-finished product bias basic circle 3 acquisition off-centre operation 10, this
When the centre of gyration of off-centre operation 10 and top positions dome 2, to position the centre of gyration of dome 5 composition be bias for bottom, obtains rivet nut；
4) to step 3) in obtain rivet nut carry out surface gas nitrogen treatment, grinding front surface hardness is not less than
600HV0.2, depth of penetration 0.2mm～0.3mm, depth of penetration must not exceed 0.3mm, it is to avoid local height hardening leads to adjust
Screw loses toughness, in gas nitriding before processing, external screw thread 8 is protected simultaneously, to avoid external screw thread 8 by after gas nitriding
Hardening, leads to screw thread edge to collapse broken；
5) to step 4) in the rivet nut that finishes of surface gas nitrogen treatment, top positioning dome 2 machined thereon and under
Portion's positioning dome 5 carries out cylindricalo grinding polish, and top positioning dome 2 and bottom positioning dome 5 are disposable clamping grinding,
And rubbing down is carried out to off-centre operation 10, after cylindricalo grinding and rubbing down, hardness is not less than 550HV0.2, and depth of penetration is not less than 0.15mm；
6) to step 5) in the rivet nut that finishes of polish and rubbing down flash removed is gone using heat energy mode；
7) to step 6) in go the rivet nut that flash removed finishes to be sampled detecting, sampling observation rate is not less than 5%, and sample detection is
Full inspection；
8) to step 7) in the qualified rivet nut of detection be carried out corrosion protection and go magnetic treatment；
9) to step 8) in be carried out rivet nut outward appearance detection that corrosion protection degaussing is disposed qualified after, encapsulation warehouse-in.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.The technology of the industry
, it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally for personnel
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and its
Equivalent thereof.
Claims (7)
1. servo adjusting screw, including rivet nut it is characterised in that being provided with external screw thread outside rivet nut upper end, setting inside upper end
Have interior hexagonal, and externally threaded lower section be provided with one level of support basic circle and two grades support basic circles, and one level of support basic circle with
It is provided with top positioning dome, two grades support the bias being provided with below basic circles for installing feedback rod between two grades of support basic circles
Circle；Rivet nut bottom is provided with bottom positioning dome, and is provided with three-level support basic circle between off-centre operation and bottom positioning dome；This
Outward, off-centre operation positions the centre of gyration that convexity becomes as bias to position dome and bottom with respect to top, and offset is 0.55
～0.75mm.
2. servo adjusting screw according to claim 1 is it is characterised in that be additionally provided with interior hexagonal base inside rivet nut upper end
Hole.
3. servo adjusting screw according to claim 1 is it is characterised in that two grades support basic circle and one level of support basic circle
Excircle dimension is less than the excircle dimension that top positions dome.
4. servo adjusting screw according to claim 1 is it is characterised in that three-level supports the excircle dimension of basic circle to be less than down
Portion positions the excircle dimension of dome.
5. servo adjusting screw according to claim 1 is it is characterised in that top positions dome and bottom positions dome
Dimensional accuracy is -0.0035mm～-0.015mm, and surface roughness is 0.8 μm.
6. servo adjusting screw according to claim 1 is it is characterised in that the dimensional accuracy of off-centre operation is -0.002mm
～-0.012mm, surface roughness is 0.8 μm.
7. the servo adjusting screw according to any one of claim 1～6 is it is characterised in that the processing of servo adjusting screw
Method comprises the following steps that：
1) choose matrix material, quenched polishing bar selected by matrix material, processes all semi-finished product setting structures, using double dynamical
Main shaft automatic lathe is processed, and obtains adjusting screw base substrate；And Production development sampling observation inspection is installed in double dynamical main shaft automatic lathe
Survey instrument；And top positioning dome and bottom positioning dome stay follow-up allowance for finish, when making adjusting screw base substrate, semi-finished product
The centre of gyration of eccentric basic circle and the centre of gyration that top positions dome, bottom positioning dome forms are concentric, and external screw thread is gone down
Deviation, the reality processing size of interior hexagonal datum hole is more than inscribed circle size 0.1mm of interior hexagonal；
2) in step 1) in hexagonal in punching on the adjusting screw base substrate that obtains, supported using external screw thread as positioning during punching；
3) gripping step 1) the middle two grades of support basic circles processed, processing semi-finished product bias basic circle acquisition off-centre operation, now off-centre operation
The centre of gyration and top position dome, bottom position dome composition the centre of gyration be bias, obtain rivet nut；
4) to step 3) in obtain rivet nut carry out surface gas nitrogen treatment, grinding front surface hardness is not less than 600HV0.2,
Depth of penetration 0.2mm～0.3mm, depth of penetration must not exceed 0.3mm, in gas nitriding before processing, external screw thread is sprayed simultaneously and protects
Sheath is protected, it is to avoid screw thread is hardened；
5) to step 4) in the rivet nut that finishes of surface gas nitrogen treatment, top positioning dome machined thereon and bottom positioning
Dome carries out cylindricalo grinding polish, and top positioning dome and bottom positioning dome are disposable clamping grinding, and to bias
Circle carries out rubbing down, and after cylindricalo grinding and rubbing down, hardness is not less than 550HV0.2, and depth of penetration is not less than 0.15mm；
6) after step 5) in after grinding polish finishes, remove the protective layer being sprayed on external screw thread；
7) to step 6) in the rivet nut that finishes of polish and rubbing down flash removed is gone using heat energy mode；
8) to step 7) in go the rivet nut that flash removed finishes to be sampled detecting, sampling observation rate is not less than 5%, and sample detection is complete
Inspection；
9) to step 8) in the qualified rivet nut of detection be carried out corrosion protection and go magnetic treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410713125.9A CN104454890B (en) | 2014-11-29 | 2014-11-29 | Servo adjusting screw and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410713125.9A CN104454890B (en) | 2014-11-29 | 2014-11-29 | Servo adjusting screw and machining method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454890A CN104454890A (en) | 2015-03-25 |
| CN104454890B true CN104454890B (en) | 2017-02-22 |
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|---|---|---|---|
| CN201410713125.9A Expired - Fee Related CN104454890B (en) | 2014-11-29 | 2014-11-29 | Servo adjusting screw and machining method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999232A (en) * | 2015-07-31 | 2015-10-28 | 梧州奥卡光学仪器有限公司 | Machining method for adjusting screw |
| CN110355535B (en) * | 2019-07-31 | 2020-07-21 | 重庆源阔机械有限公司 | Production process of engine bracket mounting bolt |
| CN113458314B (en) * | 2021-07-23 | 2024-06-25 | 合肥百恒设备模具有限公司 | Rivet mistake proofing leak protection installation device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29720625U1 (en) * | 1996-12-16 | 1998-02-12 | Macrifin S.P.A., Mailand/Milano | Control valve with pressure value display |
| CN2926619Y (en) * | 2006-03-02 | 2007-07-25 | 上海诺玛液压系统有限公司 | Electrohydraulic servo valve |
| CN201714730U (en) * | 2010-07-09 | 2011-01-19 | 无锡威孚精密机械制造有限责任公司 | Mechanical servo control valve |
| CN103982479A (en) * | 2013-12-17 | 2014-08-13 | 焦让 | Plug-in type pneumatic high-speed differential switch valve |
| CN204253550U (en) * | 2014-11-29 | 2015-04-08 | 南京萨伯工业设计研究院有限公司 | servo adjustment screw |
-
2014
- 2014-11-29 CN CN201410713125.9A patent/CN104454890B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29720625U1 (en) * | 1996-12-16 | 1998-02-12 | Macrifin S.P.A., Mailand/Milano | Control valve with pressure value display |
| CN2926619Y (en) * | 2006-03-02 | 2007-07-25 | 上海诺玛液压系统有限公司 | Electrohydraulic servo valve |
| CN201714730U (en) * | 2010-07-09 | 2011-01-19 | 无锡威孚精密机械制造有限责任公司 | Mechanical servo control valve |
| CN103982479A (en) * | 2013-12-17 | 2014-08-13 | 焦让 | Plug-in type pneumatic high-speed differential switch valve |
| CN204253550U (en) * | 2014-11-29 | 2015-04-08 | 南京萨伯工业设计研究院有限公司 | servo adjustment screw |
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| Publication number | Publication date |
|---|---|
| CN104454890A (en) | 2015-03-25 |
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