CN204269674U - Pressurized strut class tests the speed rotation-preventing mechanism - Google Patents
Pressurized strut class tests the speed rotation-preventing mechanism Download PDFInfo
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- CN204269674U CN204269674U CN201420762034.XU CN201420762034U CN204269674U CN 204269674 U CN204269674 U CN 204269674U CN 201420762034 U CN201420762034 U CN 201420762034U CN 204269674 U CN204269674 U CN 204269674U
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Abstract
A kind of pressurized strut class disclosed in the utility model tests the speed rotation-preventing mechanism, and aim to provide a kind of installations, convenient disassembly, highly versatile, test data is reliable, the rotation-preventing mechanism that tests the speed that data alternative is strong.The utility model is achieved by following technical proposals: pressurized strut (9) head end is by the Large lining (17) in the large vertical rod of threaded post (1), tail end is connected in the U-shaped erection joint (16) of being stretched out by the second back up pad (14) level, piston rod movement end is by the large vertical rod nut (2) of threaded post, little vertical rod (5) is connected after packing ring (3) two-sided clamping, perpendicular to the massive plate (7) of lower end, little vertical rod (5) is by sensor core bar (10) connection bit displacement sensor (12), when pressurized strut series products tests the speed, piston rod is pushed out under hydraulic action, band dynamic sensor core bar synchronously moves forward, data acquisition system (DAS) (18) record change in displacement and corresponding time, calculate the speed index within the scope of pressurized strut piston rod arbitrary distance of run.
Description
Technical field
The utility model relates to and a kind ofly moves to hydraulic pressure the mechanism that cylinder tests the speed.The rotation-preventing mechanism that tests the speed that hydraulic pressure moves the speed index in the whole motion process of cylinder is measured after hydraulic pressure moves a voltage supply.
Background technology
At present, because pressurized strut series products quantity is many, installation site is various.No matter its version how, and the basic composition of pressurized strut is made up of parts such as cylindrical shell, piston, piston rod, end cap, sealing, inlet and outlet pipings substantially.The principle of work of pressurized strut is when cylindrical shell is fixed, if the defeated people's hydraulic fluid in the left chamber of cylinder, when fluid pressure is elevated to and is enough to overcome extraneous load, piston just starts to move right.If continuously supply fluid, then piston moves continuously with certain speed.The physical essence of pressurized strut work is: utilize fluid pressure to overcome load (comprising friction force), utilizes fluid flow to maintain movement velocity.Because the diameter of piston rod at dual-rod hydraulic cylinder two ends is normally equal, therefore left and right two chamber useful area are also equal.When the fluid identical with flow respectively to left and right two chamber input pressures, the thrust of the left and right both direction of hydraulic cylinder is equal with speed.Single-rod cylinder due to piston two ends useful area not etc., therefore when the pressure of oil suction chamber and oil back chamber is respectively P, Pz, when the flow inputting left and right two chambeies is all q, the thrust of left and right both direction and speed are different.If to chamber, the left and right two logical pressure oil simultaneously of single-rod cylinder, namely become differential connection, the single-rod cylinder doing differential connection is called differential hydro cylinder.During differential connection, little during the non-differential connection of thrust ratio of hydraulic cylinder, speed is than large during non-differential connection, and this connected mode is widely used in the hydraulic power slid platform of building-block machine and the rapid movement of other plant equipment.Hydraulic actuator on aircraft mainly contains single-acting formula and double-acting type two kinds of citation forms.The piston of single-acting formula pressurized strut to a direction motion, then can only be returned by spring action under hydraulic action.Pressure oil leads to hydraulic fluid port from the left side and enters, and oil pressure acts on the end face of piston, forces piston to move right; When the piston is moving, the air of the right spring chamber is discharged by breeder tube, spring pressurized; When the oil liquid pressure release of pressure acted on piston and when being less than the tension force of Compress Spring, spring is upheld and promoted piston and is moved to the left; Because moving to left of piston, left chamber fluid is extruded logical hydraulic fluid port, and air enters spring chamber by air hole simultaneously.The pressurized strut of double-acting type pressurized strut double-action type can utilize fluid push mechanism to move reciprocatingly.When high-voltage oil liquid enters people's pressurized strut from left side joint, the piston of band bar moves right under hydraulic action, and the fluid in the right chamber of pressurized strut then flows back to fuel tank from the right joint; If high-voltage oil liquid enters pressurized strut from the right joint, then the direction of motion of piston with rod is contrary to the above.Double-acting type pressurized strut mainly contains two-way single lever-type and two-way double rod type two kinds of forms.Two-way single lever-type pressurized strut also claims two-way unbalanced pressurized strut, piston the right and left is unequal by the useful area (i.e. effective working area) of hydraulic action, when oil liquid pressure is equal, the driving force that pressurized strut produces along both direction is also unequal.Useful area equally due to these pressurized strut piston two ends is different, and when pressurized strut two ends input flow rate is identical, piston back-and-forth movement speed is different, and the piston speed of stretching out is less than its retraction speed.The pressurized strut of two-way single pole pressurized strut single lever-type is usually used in the place needing different driving force in the two directions.As at landing-gear system, often adopt the pressurized strut of this kind of form.Undercarriage in process, due to gravity and aerodynamic effect, needs larger driving force when making in receipts in receipts; And in drop process, be gravitational force urges gear down, therefore do not need very large driving force, so undercarriage control pressurized strut often adopts two-way single lever-type pressurized strut.When undercarriage stowage, allow pressure oil lead to pressurized strut piston large area, ensure to receive rapidly upper undercarriage to obtain larger driving force.Gear down time, pressure oil is allowed to lead to pressurized strut piston small size, and current limiting check valve controlled pressure oil flow, to prevent, gear down speed is too quickly and speed is excessive and generation shock.Along with hydraulic user is to the raising of equipment requirement, device action reliability more and more causes the very big concern of user.For ensureing the order regular event of two or more actuator by regulation, system requirements can be realized by mechanical hook-up, logical circuit or the Hydraulic Elements such as hydraulic circuit hydraulic control cylinder and solenoid directional control valve, but this can make system become more complicated undoubtedly, reliability reduces, and cost increases.The major failure of pressurized strut has: piston rod movement is too slow, and speed is uneven or have interruption phenomenon; Steel ball lock and snap ring pin are unblanked, it is dumb to lock, and make out, pressure of locking exceedes regulation, lock not firm, even can not lock.(1) reason of motion bar bradykinesia motion bar bradykinesia, one is that the packoff of pressurized strut damages leakage of oil, makes to enter the fluid flow that pressurized strut promotes piston movement and reduces.As the cushion rubber on piston damages, the high-voltage oil liquid of working chamber can leak into inoperative chamber and go, and working pressure is reduced, and opposite pressure increases, and piston rod movement is slow.Two is outer tube inner wall, tapered piston and piston corrosion, or the layers of chrome on motion bar comes off, and the friction force that motion bar is moved increases, and also can accelerate the wearing and tearing of packoff, make motion bar bradykinesia.If outer tube inner wall local scratches or pressurized strut local friction increases, then piston rod movement speed can be made uneven or have interruption phenomenon; If it is improper to assemble, piston rod movement also can be caused slow.(2) unblank, dumb steel ball lock of locking is unblanked, it is dumb to lock, mainly due to pressurized strut poor sealing or piston friction power excessive, may be also because steel ball is dumb in the motion of steel ball hole, or the part movement such as tapered piston be dumb, even can not lock.(3) not firm steel ball lock of locking not firm, general reason of locking is: steel ball hole and locked groove wearing and tearing, wound, and makes the free gap of steel ball lock excessive.Because excesssive gap, when piston rod is by External Force Acting, steel ball lock bears very large bump stroke, easily automatic lock-off, even by bad for lock top.In addition, on steel ball lock, the nut of the tired or fixing spring of spring loosens, and spring tension is reduced, also can cause lock not firm.
Most of hydraulic pressure moved when cylinder is installed and all will consider left and right stationary problem, the speed index after needing to provide hydraulic pressure to move a voltage supply in whole motion process present stage, prevented from installing after hydraulic pressure moves cylinder occurring left and right asynchrony phenomenon.Carry out laser velocimeter because device-restrictive does not possess special speed measuring equipment, therefore the rotation-preventing mechanism that tests the speed that present stage uses mainly divides two kinds of structures:
One, utilize electrical secondmeter to measure the piston rod movement time, utilize its movement travel of kind of calliper, utilize mathematical formulae (movement travel ÷ run duration=movement velocity) indirectly to obtain movement velocity index.But electrical secondmeter need be energized and power-off, during test, motion initial point and end point are removed, therefore cannot Measurement accuracy piston rod whole section of movement velocity, can only go out average velocity with most of stroke indirect measuring of its motion.Such rotation-preventing mechanism that tests the speed utilizes spring copper sheet to be connected with pressurized strut series products afterbody, and after utilizing conduction copper rod length legislations stroke, when piston rod stroke moves to conductive segment, electrical secondmeter starts timing, and after throwing off conduction copper rod, electrical secondmeter stops timing.
Two, the movement travel of optical grating ruler measurement pressurized strut series products is relied on, drawn by PLC conputer controlled and move this apart from the time used, indirectly obtaining movement velocity index by mathematical formulae (movement travel ÷ run duration=movement velocity), the average movement velocity that this method of testing tests out more accurately reflects that hydraulic pressure moves the average velocity of a product in whole motion process.But for current section hydraulic move cylinder product requirement test first section and rear buffer portion movement velocity index then more difficult, cannot design parameter be set, even if mark provides body parameter on PLC, but hydraulic pressure moves after in cylinder motion process, starting point and terminal may offset, and test data accuracy will go wrong.The detection speed mechanism that this method of testing uses can not effectively prevent the piston rod occurred in pressurized strut series products motion process from rotating, be easy to affect test result after rotating if occur, need in test process manually to calibrate piston rod movement track, otherwise the friction force that guide piece produces will affect test result.
Summary of the invention
The utility model in order to overcome existing pressurized strut series products test the speed rotation-preventing mechanism test inaccurate, by operator's calibration affect large, guide piece friction force is large, affect the weak points such as test result, there is provided a kind of structure simple, installation, convenient disassembly, highly versatile, test data is reliable, and the alternative strong pressurized strut class of data tests the speed rotation-preventing mechanism.
The utility model solves the technical scheme that its technical matters adopts: a kind of pressurized strut class tests the speed rotation-preventing mechanism, comprises the motion rotation-preventing mechanism be positioned on pressurized strut piston rod, and is fixed on the common support plate in pressurized strut 9 initial and end portion.It is characterized in that: pressurized strut 9 head end is by the Large lining 17 in the large vertical rod 1 of threaded post, tail end is connected in the U-shaped erection joint 16 of being stretched out by the second back up pad 14 level, piston rod movement end is by large vertical rod 1 nut 2 of threaded post, little vertical rod 5 is connected after the two-sided clamping of packing ring 3, the massive plate 7 of vertical lower end, fixed cover 6 perforate that little vertical rod 5 connects firmly is parallel to piston rod, simultaneously by sensor core bar 10 connection bit displacement sensor 12, first back up pad 11 and the second back up pad 14 tail end connection data acquisition system 18 of displacement transducer 12 by being parallel to each other, be parallel to pressurized strut, when pressurized strut series products tests the speed, piston rod is pushed out under hydraulic action, under ball bearing roller set 8 guide effect under massive plate 7, to drive and sensor core bar 10 that motion rotation-preventing mechanism connects synchronously moves forward, displacement transducer 12 records change in displacement and corresponding time by data acquisition system (DAS) 18, calculates speed index within the scope of pressurized strut piston rod arbitrary distance of run by the displacement that gathers and time curve.
The utility model has following beneficial effect compared to prior art.
The utility model can be common to the various pressurized strut series products of size and to test the speed rotation-preventing mechanism, this pressurized strut series products tests the speed, and rotation-preventing mechanism is not only installed, convenient disassembly, measure accurately and reliably, amount of test data is large, do not affect by operator during test, and former pressurized strut series products special tooling can be common to carry out work of testing the speed, do not need to consider frock measurer separately again, accurately can test out the various speed data indexs in pressurized strut series products motion process.
Structure is simple, installation, convenient disassembly, only pressurized strut need be passed the first back up pad 11 and the second back up pad 14 when installing pressurized strut.Large for threaded post vertical rod 1 being connected through fixed cover 6 fixing with the massive plate 7 of band rolling bearing roller 8 after pressurized strut piston rod mounting hole, by rotating little vertical rod 5 adjustment height, fixing with packing ring 3, nut 2.
Highly versatile, carrys out the support needs of satisfied different pressurized strut series products by changing Large lining 17 and erection joint 16 for the difference of various pressurized strut physical dimension.
Do not affect by operator during test, during test, operator only need set the flow required when product tests the speed, after installing pressurized strut series products, open testing table to the voltage supply of pressurized strut series products, piston rod 4 can brought into motion rotation-preventing mechanism moving linearly under action of hydraulic force.Motion process carries out speed measuring and calculating by displacement transducer 12 writing times-displacement curve.Do not need operator to set movement travel in test process, motion starting point and terminal, without artifical influence factor in test process.
Test data is reliable and amount of test data is large, data are alternative strong, because test process does not affect by any human factor, only need be arranged on mechanism for testing by product after the flow required set up by testing table, starting characteristics test platform can complete product and test the speed, Gu test data reliability is higher.Because the motion of product total travel all drives displacement transducer 12 to gather by fixed cover 6 in test process, therefore all can carry out selections calculating by the time-displacement curve of testing software record to the speed index of product in whole motion process.Data acquisition amount is large, and data are complete, can choose one section of needs according to actual needs or a few segment data carries out recording, analyzing in motion process, and this turn improves the accuracy of test result to a certain extent.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is that the utility model pressurized strut class tests the speed the front view of rotation-preventing mechanism.
Fig. 2 is motion rotation-preventing mechanism enlarged diagram.
Fig. 3 Fig. 1 left end close-up schematic view.
Fig. 4 is Fig. 1 right-hand member close-up schematic view.
In figure: 1 large vertical rod, 2 nuts, 3 packing rings, 4 piston rods, 5 little vertical rods, 6 fixed covers, 7 massive plates, 8 rolling bearing rollers, 9 pressurized struts, 10 sensor core bars, 11 first back up pads, 12 displacement transducers, 13 geometrical clamps, 14 second back up pads, 15, nut, 16 erection joints, 17 linings, eighteen data acquisition system.
Embodiment
Consult Fig. 1-Fig. 2.In embodiment described below, the pressurized strut class rotation-preventing mechanism that tests the speed comprises: be positioned at the first back up pad 11 and the second back up pad 14 that pressurized strut is fixed in pressurized strut one end, and fixing motion rotation-preventing mechanism on the piston rod and data acquisition system (DAS), the motion rotation-preventing mechanism be positioned on pressurized strut piston rod, and be fixed on the common support plate in pressurized strut 9 initial and end portion.Wherein, rotation-preventing mechanism comprises, the body of rod is shaped with the large vertical rod of threaded post 1 of radial connection piston rod 4, is positioned at threaded post large vertical rod 1 lower end, vertically connect the little vertical rod 5 of massive plate 7 by rotating nut and connect firmly the fixed cover 6 in little vertical rod 5, and the traveling wheel mechanism be positioned at below massive plate 7, traveling wheel mechanism is made up of the ball bearing roller set 8 be positioned at below massive plate 7.Pressurized strut 9 head end is by the Large lining 17 in the large vertical rod 1 of threaded post, tail end is connected in the U-shaped erection joint 16 of being stretched out by the second back up pad 14 level, piston rod movement end is by large vertical rod 1 nut 2 of threaded post, little vertical rod 5 is connected after the two-sided clamping of packing ring 3, the massive plate 7 of vertical lower end, fixed cover 6 perforate that little vertical rod 5 connects firmly is parallel to piston rod, simultaneously by sensor core bar 10 connection bit displacement sensor 12, first back up pad 11 and the second back up pad 14 tail end connection data acquisition system 18 of displacement transducer 12 by being parallel to each other, be parallel to pressurized strut, when pressurized strut series products tests the speed, piston rod is pushed out under hydraulic action, under ball bearing roller set 8 guide effect under massive plate 7, to drive and sensor core bar 10 that motion rotation-preventing mechanism connects synchronously moves forward, displacement transducer 12 records change in displacement and corresponding time by data acquisition system (DAS) 18, calculates speed index within the scope of pressurized strut piston rod arbitrary distance of run by the displacement that gathers and time curve.
Be specially and consult Fig. 3, Fig. 4.Pressurized strut 9 cylindrical shell right-hand member stretches into erection joint 16U shape prong, is bolted, and erection joint 16 penetrates the second back up pad 14 mounting hole, is fixed by nut 15.Pressurized strut 9 cylindrical shell left end snaps in the first back up pad 11 mounting hole by lining 17, axial piston bar 4 in pressurized strut 9 is by the radial hole on motion rotation-preventing mechanism threaded post large vertical rod 1 body of rod, gripped by the nut 2 be positioned on radial hole upper and lower end face, packing ring 3, motion rotation-preventing mechanism and piston rod 4 are connected as a single entity.Piston rod 4 moves and to be stretched out in the lump by brought into motion rotation-preventing mechanism and retract.The little vertical rod 5 connected firmly in threaded post large vertical rod 1 lower end extends downward vertically and connects firmly on massive plate 7 plate body of corresponding walking roller.Massive plate 7 is adjusted by the rotating nut on little vertical rod 5 axle head with the discrepancy in elevation of platform plane, to ensure that 4 rolling bearing rollers 8 of walking roller on massive plate 7 contact with platform plane, formed a kinetic friction force little while can prevent piston rod in motion process from rotating the large plane of rolling.Deflection force is delivered on the massive plate 7 of below by two large and small vertical rods be parallel to each other when piston rod 4 rotates by motion rotation-preventing mechanism.The walking roller plane be made up of 4 rolling bearing rollers 8 below massive plate 7 effectively can overcome the deflection force of appearance, provides reacting force correction pressurized strut piston rod simultaneously and is delivered to turning moment on massive plate 7 by the little vertical rod 5 of threaded post large vertical rod 1 lower end.Displacement transducer 12 is by being fixed by geometrical clamp 13 after the mounting hole in the second back up pad 14 and the first back up pad 11.After completing, the sensor core bar 10 of axial connection bit displacement sensor 12 is connected by fixed cover 6 mounting hole that little vertical rod 5 connects firmly.Velocity test can be carried out to pressurized strut series products input hydraulic pressure after connection.In test process, displacement transducer core bar 10 under the drive of motion rotation-preventing mechanism with piston rod 4 synchronous shift, by the displacement transducer 12 of the second back up pad 14 mounting hole, data acquisition system (DAS) 18 through axially connecting records change in displacement and corresponding time used, data acquisition system (DAS) 18 is according to the moving displacement variable quantity recorded and time curve, utilize formula displacement ÷ time=speed, calculate the speed index within the scope of pressurized strut piston rod 4 arbitrary distance of run.
Claims (10)
1. a pressurized strut class tests the speed rotation-preventing mechanism, comprise the motion rotation-preventing mechanism be positioned on pressurized strut piston rod, and be fixed on pressurized strut head, the common support plate of afterbody, it is characterized in that: pressurized strut (9) head end is by the Large lining (17) in the large vertical rod of threaded post (1), tail end is connected in the U-shaped erection joint (16) of being stretched out by the second back up pad (14) level, piston rod movement end uses nut (2) by a large vertical rod of threaded post (1), little vertical rod (5) is connected after packing ring (3) two-sided clamping, perpendicular to the massive plate (7) of lower end, fixed cover (6) perforate that little vertical rod (5) connects firmly is parallel to piston rod (4), simultaneously by sensor core bar (10) connection bit displacement sensor (12), displacement transducer (12) is by the first back up pad (11) of being parallel to each other and the second back up pad (14) tail end connection data acquisition system (18), be parallel to pressurized strut, when pressurized strut series products tests the speed, piston rod is pushed out under hydraulic action, under ball bearing roller set (8) guide effect under massive plate (7), to drive and the sensor core bar (10) that connects of motion rotation-preventing mechanism synchronously moves forward, displacement transducer (12), by data acquisition system (DAS) (18) record change in displacement and corresponding time, calculates the speed index within the scope of pressurized strut piston rod arbitrary distance of run by the displacement that gathers and time curve.
2. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: rotation-preventing mechanism comprises, the body of rod is shaped with the large vertical rod of threaded post (1) of radial connection piston rod (4), is positioned at the large vertical rod of threaded post (1) lower end, vertically connect the little vertical rod (5) of massive plate (7) by rotating nut and connect firmly the fixed cover (6) in little vertical rod (5), and being positioned at the traveling wheel mechanism of massive plate (7) below.
3. pressurized strut class as claimed in claim 2 tests the speed rotation-preventing mechanism, it is characterized in that: traveling wheel mechanism is made up of the ball bearing roller set (8) being positioned at massive plate (7) below.
4. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: pressurized strut (9) cylindrical shell right-hand member stretches into erection joint (16) U-shaped prong, be bolted, erection joint (16) penetrates the second back up pad (14) mounting hole, is fixed by nut (15).
5. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: pressurized strut (9) cylindrical shell left end snaps in the first back up pad (11) mounting hole by lining (17), axial piston bar (4) in pressurized strut (9) is by the radial hole on the large vertical rod of threaded post (1) body of rod, gripped by the nut be positioned on radial hole upper and lower end face (2), packing ring (3), motion rotation-preventing mechanism and piston rod (4) are connected as a single entity.
6. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: massive plate (7) is adjusted by the rotating nut on little vertical rod (5) axle head with the discrepancy in elevation of platform plane, four rolling bearing rollers of the upper walking roller of massive plate (7) are contacted with platform plane, formed a kinetic friction force little while can prevent the large plane of rolling of piston rod rotation in motion process.
7. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: deflection force is delivered on below massive plate (7) by two large and small vertical rods be parallel to each other when piston rod (4) rotates by motion rotation-preventing mechanism.
8. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: the sensor core bar (10) of axial connection bit displacement sensor (12) is connected by fixed cover (6) mounting hole that little vertical rod (5) connects firmly.
9. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: displacement transducer (12) is by fixing by geometrical clamp (13) after the mounting hole in the second back up pad (14) and the first back up pad (11).
10. pressurized strut class as claimed in claim 1 tests the speed rotation-preventing mechanism, it is characterized in that: in test process, displacement transducer core bar (10) under the drive of motion rotation-preventing mechanism with piston rod (4) synchronous shift, by the displacement transducer (12) of the second back up pad (14) mounting hole, data acquisition system (DAS) (18) record change in displacement through axially connecting and corresponding time used, data acquisition system (DAS) (18) is according to the moving displacement variable quantity recorded and time curve, utilize formula displacement ÷ time=speed, calculate the speed index within the scope of pressurized strut piston rod (4) arbitrary distance of run.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104459189A (en) * | 2014-12-05 | 2015-03-25 | 四川凌峰航空液压机械有限公司 | Actuator cylinder piston rod travel speed measurement device |
| CN107179233A (en) * | 2017-05-16 | 2017-09-19 | 中国建筑股份有限公司 | A kind of multidirectional measurement erecting device of displacement transducer |
| CN110202527A (en) * | 2019-06-14 | 2019-09-06 | 南昌矿山机械有限公司 | Single-Cylinder Hydraulic Cone Crusher upper spider attaching/detaching apparatus and method |
| CN113879560A (en) * | 2021-11-13 | 2022-01-04 | 四川凌峰航空液压机械有限公司 | Method for measuring movable clearance of internal lock of airplane actuator cylinder |
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2014
- 2014-12-05 CN CN201420762034.XU patent/CN204269674U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104459189A (en) * | 2014-12-05 | 2015-03-25 | 四川凌峰航空液压机械有限公司 | Actuator cylinder piston rod travel speed measurement device |
| CN104459189B (en) * | 2014-12-05 | 2017-10-03 | 四川凌峰航空液压机械有限公司 | Pressurized strut piston rod arbitrary distance of run speed measuring device |
| CN107179233A (en) * | 2017-05-16 | 2017-09-19 | 中国建筑股份有限公司 | A kind of multidirectional measurement erecting device of displacement transducer |
| CN110202527A (en) * | 2019-06-14 | 2019-09-06 | 南昌矿山机械有限公司 | Single-Cylinder Hydraulic Cone Crusher upper spider attaching/detaching apparatus and method |
| CN110202527B (en) * | 2019-06-14 | 2023-06-16 | 南昌矿机集团股份有限公司 | Device and method for disassembling and assembling upper frame of single-cylinder hydraulic cone crusher |
| CN113879560A (en) * | 2021-11-13 | 2022-01-04 | 四川凌峰航空液压机械有限公司 | Method for measuring movable clearance of internal lock of airplane actuator cylinder |
| CN113879560B (en) * | 2021-11-13 | 2023-09-26 | 四川凌峰航空液压机械有限公司 | Method for measuring movable clearance of inner lock of aircraft actuating cylinder |
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