CN203784007U - Single piston rod symmetric digital servo hydraulic cylinder - Google Patents
Single piston rod symmetric digital servo hydraulic cylinder Download PDFInfo
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- CN203784007U CN203784007U CN201420163336.5U CN201420163336U CN203784007U CN 203784007 U CN203784007 U CN 203784007U CN 201420163336 U CN201420163336 U CN 201420163336U CN 203784007 U CN203784007 U CN 203784007U
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Abstract
The utility model relates to a single piston rod symmetric digital servo hydraulic cylinder and belongs to the technical field of digital hydraulics. The utility model aims to solve the problems of an electro hydraulic servo system that the control is inaccurate, the gain is difficult to regulate, the systematic dynamic characteristics are not symmetric when a symmetric valve controls an unsymmetric hydraulic cylinder to move and reverse. A valve core of a sliding valve of the single piston rod symmetric digital servo hydraulic cylinder is driven and controlled by a first motor, a feedback screw sleeve of the sliding sleeve is controlled by a second motor, a hydraulic cylinder displacement signal is fed back to a host control system by a hysteresis telescopic displacement sensor, and is fed back to a driver corresponding to the second motor by the host control system, the second motor is controlled to operate by the driver, and closed loop digital control on the displacement of the hydraulic cylinder is realized through control on relative movement of the feedback screw sleeve and the valve core. Two action areas of the single piston rod digital servo hydraulic cylinder are equal, the working space is small, the structure is simple, two-way control can be realized, the stability is good, and the hydraulic cylinder is applicable to the situations where the hydraulic cylinder adopts a long stroke, and the requirement on control performance is higher.
Description
Technical field
The utility model relates to Hydraulic servo technology, relates in particular to the magnetic hysteresis telescopic displacement sensor oil hydraulic cylinder that a kind of single rod active area is equal, belongs to digital hydraulic technical field.
Background technique
Oil hydraulic cylinder be by the pressure energy of hydraulic oil change into mechanical energy in order to realize the executive component of straight reciprocating motion, traditional oil hydraulic cylinder is generally by electrohydraulic servo system or electro-hydraulic proportional system control, can accurately control physical quantitys such as the displacement of hydraulic system, speed, power though have, but can not realize directly digital control, need to pass through D/A-Mo/analog-to-digital conversion apparatus, to a certain degree limit its application area.Existing pulse hydraulic oil cylinder or digital cylinder are directly driven and controlled servovalve by stepper motor, are equipped with internal mechanical feedback, can realize Direct Digital signal (pulse) and control, and can reach the position control accuracy of 0.01mm.But because internal mechanical feedback mechanism exists manufacturing difficulty, installation precision requires high, easily break down and keep in repair the problems such as trouble, especially after oil cylinder stroke increases, the problems referred to above are more obvious, and this has limited the stroke of this class oil hydraulic cylinder to a certain extent.And in actual applications, also exist the gain of commutation vibration, low speed jerking motion, control loop to be difficult to the problems such as adjustment.Existing symmetrical hydraulic cylinder is generally two rods, and two active areas of the oil hydraulic cylinder of single rod are unequal, are asymmetrical cylinder.Single rod asymmetrical cylinder has with respect to two rod symmetrical hydraulic cylinders that working space is little, advantages of simple structure and simple, has obtained application more widely, but has also existed many drawbacks.As hydraulic cylinder electrohydraulic servo-system realized to when commutation motion Symmetrical Valve control list rod is non-, easily there is the phenomenons such as cavitation erosion and superpressure in oil hydraulic cylinder two chambeies, simultaneously oil hydraulic cylinder two cavity areas do not wait while causing forward and reverse motion hydraulic system rigidity not etc., cause system dynamic characteristic asymmetric, particularly speed characteristics are asymmetric, equate if system need to reach forward and reverse maximum speed of motion, increased the demand of system to flow, thereby increased volume and the cost of hydraulic power.For solving the asymmetric problem of dynamic characteristic, need to adopt complicated self-adaptation control method to carry out on line real time control, to realize the control of system highi degree of accuracy, another kind method is the single rod asymmetrical cylinder coupling Asymmetry Valve according to different structure size, because Asymmetry Valve belongs to nonstandard product, need customization, so expensive, and the different Asymmetry Valve of single rod asymmetrical cylinder needs of different area ratio, interchangeability is very poor.Although there are not the problems referred to above in two rod symmetrical hydraulic cylinders, in some special occasions, owing to being subject to the restriction of bulk, as the field such as flight simulator, road simulation system but cannot be used.
Model utility content
For the problem of above-mentioned existence, the utility model provides a kind of single rod digital servo cylinder, has long stroke, high stability, and single rod, oil hydraulic cylinder two active areas equate to have magnetic hysteresis telescopic displacement sensor and carry out the feature of digital feedback.In order to achieve the above object, the utility model is taked following technological scheme:
A kind of single rod symmetrical figure servo hydraulic cylinder is by manifold block, manifold block vertical supporting plate, manifold block cross-brace plate, the first motor, the second motor, guiding valve, oil hydraulic cylinder, magnetic hysteresis telescopic displacement sensor composition.The piston rod inside of described oil hydraulic cylinder is provided with inner piston rod, and inner piston rod is fixedly connected with cylinder bottom, and inner piston rod and piston rod are the Spielpassung of sealing.The outer wall of the cylinder bottom of oil hydraulic cylinder is provided with magnetic hysteresis telescopic displacement sensor, magnetic hysteresis telescopic displacement sensor is threaded with the cylinder bottom of oil hydraulic cylinder, the measuring staff of magnetic hysteresis telescopic displacement sensor is positioned at the below of piston rod, and the magnet ring of magnetic hysteresis telescopic displacement sensor is fixedly set on piston.The top of oil hydraulic cylinder is provided with manifold block, manifold block is positioned at cylinder bottom one end of oil hydraulic cylinder, one end of manifold block is fixedly connected with the cylinder bottom of oil hydraulic cylinder by bolt, the other end is fixedly connected with manifold block cross-brace plate by bolt, the lower end of manifold block cross-brace plate is arranged with manifold block vertical supporting plate, and manifold block vertical supporting plate is fixedly connected with manifold block cross-brace plate by bolt.Above manifold block, be provided with guiding valve, the valve body of guiding valve is fixedly connected with manifold block bolt, and in one end of the spool of guiding valve, cover has feedback swivel nut, and feedback swivel nut is threaded with spool, the outer surface of feedback swivel nut is fixed by two bearings in valve body, is provided with dottle pin in the middle of two bearings.Be arranged with the first motor and the second motor at the two ends of guiding valve valve body, the motor shaft of the first motor is connected with one end of spool by shaft coupling, and the motor shaft of the second motor is inserted into one end of feedback swivel nut, and is fixedly connected with feedback swivel nut by Cock screw.In the cylinder cap of oil hydraulic cylinder, be provided with oil circuit hole, cylinder cap top is provided with the first pipe joint, the first cored screw spinning is in the first pipe joint, its lower end is inserted in the oil circuit hole of cylinder cap, in the valve body of guiding valve, be provided with oil circuit hole, valve body top is provided with the second pipe joint, and the second cored screw spinning is in the second pipe joint, and its lower end is inserted in the oil circuit hole of valve body.One end of oil pipe C is connected with the first pipe joint, and the other end is connected with manifold block, and one end of oil pipe A is connected with manifold block, and the other end is connected with the right end cap of guiding valve, and oil pipe B one end is connected with manifold block, and the other end is connected with the second pipe joint.By piston rod, a chamber that inner piston rod forms is communicated with outside oil circuit through P mouth, by cylinder barrel, and cylinder cap, piston, piston rod is communicated with outside oil circuit through O mouth with the b chamber that the measuring staff of magnetic hysteresis telescopic displacement sensor forms.Two acting surface I faces of oil hydraulic cylinder are equal with II face area.
Owing to adopting above technological scheme, feedback fraction of the present utility model is that the magnet ring of magnetic hysteresis telescopic displacement sensor is fixedly set on piston, the displacement that magnetic hysteresis telescopic displacement sensor measurement goes out oil hydraulic cylinder, the Displacement Feedback signal that the second motor detects according to magnetic hysteresis telescopic displacement sensor is controlled the motion of feedback swivel nut, the first Electric Machine Control spool motion, by the control to feedback swivel nut and the two relative movement of spool, realize the closed-loop digital control to oil hydraulic cylinder displacement.Adopt this displacement transducer digital signal feedback, compared with mechanical internal feedback structure, have control accuracy high, vibrate littlely, stability is better, and is more suitable in the occasion of the oil hydraulic cylinder of long stroke work.In addition, the utility model adopts the symmetrical hydraulic cylinder of single rod, belongs to Symmetrical Valve control asymmetric cylinder, compared with Symmetrical Valve control asymmetrical cylinder, has system control accuracy high, and dynamic characteristic is better.Single rod symmetrical figure servo hydraulic cylinder of the present utility model because its working space is little, simple structure, the feature such as can two-wayly control, in hydraulic system application very extensive, be particularly useful for the use occasion that limited space, control performance are had relatively high expectations.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the side view of Fig. 1.
Fig. 3 is motor and spool valve combinations structural representation.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described further:
As Fig. 1, Fig. 2, shown in Fig. 3
Single rod symmetrical figure servo hydraulic cylinder is by manifold block 1, manifold block vertical supporting plate 34, manifold block cross-brace plate 33, the first motors 2, the second motor 18, guiding valve, oil hydraulic cylinder, magnetic hysteresis telescopic displacement sensor 30, the first pipe joint 23, the first cored screw 22, the second pipe joint 9, the second cored screws 10 form.The first motor 2 and the second motor 18 can adopt actuating motor or stepper motor.
Oil hydraulic cylinder is by cylinder barrel 21, piston 28, inner piston rod 26, piston rod 25, cylinder cap 24, cylinder bottom 31 forms, be provided with cylinder bottom 31 at the right-hand member of cylinder barrel 21, cylinder bottom 31 is fixedly connected with cylinder barrel 21 by bolt, be provided with cylinder cap 24 on cylinder barrel 21 left sides, cylinder cap 24 is fixedly connected with cylinder barrel 21 by bolt, between cylinder cap 24 and cylinder bottom 31, be provided with piston 28, being slidably matched for sealing between piston 28 and cylinder barrel 21, in cylinder barrel 21, be provided with piston rod 25, the right-hand member of piston rod 25 is processed with outside thread, be inserted into the hole of piston 28, and be connected with piston 28 screw-thread fit, the left end of piston rod 25 passes from the center hole of cylinder cap 24, piston rod 25 inside are provided with inner piston rod 26, inner piston rod 26 is fixedly connected with cylinder bottom 31, inner piston rod 26 and the Spielpassung of piston rod 25 for sealing.Oil hydraulic cylinder be by the pressure energy of hydraulic oil change into mechanical energy in order to realize the executive component of straight reciprocating motion.
The outer wall of the cylinder bottom 31 of oil hydraulic cylinder is provided with magnetic hysteresis telescopic displacement sensor 30, magnetic hysteresis telescopic displacement sensor 30 is threaded with the cylinder bottom 31 of oil hydraulic cylinder, the measuring staff 27 of magnetic hysteresis telescopic displacement sensor 30 is positioned at the below of piston rod 25, and the magnet ring 29 of magnetic hysteresis telescopic displacement sensor 30 is fixedly set on piston 28.The effect of magnetic hysteresis telescopic displacement sensor 30 is to detect the displacement amount that the piston rod of oil hydraulic cylinder 25 moves, and feeds back to upper control system, the corresponding driver of upper control system control the second motor 18, the running of driver control the second motor 18.
The top of oil hydraulic cylinder is provided with manifold block 1, manifold block 1 is positioned at cylinder bottom 31 one end of oil hydraulic cylinder, one end of manifold block 1 is fixedly connected with the cylinder bottom 31 of oil hydraulic cylinder by bolt, the other end is fixedly connected with manifold block cross-brace plate 33 by bolt, the lower end of manifold block cross-brace plate 33 is arranged with manifold block vertical supporting plate 34, and manifold block vertical supporting plate 34 is fixedly connected with manifold block cross-brace plate 33 by bolt.The effect of manifold block cross-brace plate 34 and vertical supporting plate 33 is to support manifold block 1.
Guiding valve is by valve body 8, valve pocket 11, valve rod 13, spool 7, left end cap 17, right end cap 3, shaft coupling 4, bearing 14, dottle pin 15, gear pad 12, setting sleeve 6, restraint cover 5, feedback swivel nut 16 forms, guiding valve is positioned at the top of oil-way integrated block 1, the valve body 8 of guiding valve is fixedly connected with oil-way integrated block 1, two ends at valve body 8 are arranged with end cap, be fixedly connected with valve body 8 by bolt respectively, right end cap 3 inside are provided with shaft coupling 4, in valve body 8, be provided with spool 7, one end of spool 7 is threaded with shaft coupling 4, in valve body 8, be provided with feedback swivel nut 16, be positioned at left end cap 17 one end, one end of spool 7 is processed with outside thread, be screwed in the internal thread of right-hand member of feedback swivel nut 16, the outer surface of feedback swivel nut 16 is fixing by two bearings 14, between two bearings 14, be provided with dottle pin 15, be provided with valve rod 13 at the outer surface of spool 7, spool 7 right-hand member multidiameter shaft places are provided with setting sleeve 6, valve rod 13 cover that is positioned 6 is fixed on spool 7, valve rod 13 is fixedly connected with spool 7 by Cock screw, the outer surface of valve rod 13 is provided with valve pocket 11, be provided with restraint cover 5 at the right-hand member of valve pocket 11, valve pocket 11 right-hand members are fixed on the inside of valve body 8 by restraint cover 5, valve pocket 11 and the middle gear pad 12 that is provided with of bearing 14, valve rod 13 can move axially with spool 7 in valve pocket 11.Guiding valve plays signal conversion and power amplification in Hydrauservo System, it is the straight-line displacement that the angular displacement of the first motor 2 is accurately converted to oil hydraulic cylinder, opening degree according to the valve rod 13 of guiding valve in valve pocket 11, can control flow velocity and the active force of oil hydraulic cylinder, it is very large on the service behaviour impact of system.
Be arranged with the first motor 2 and the second motor 18 at the two ends of guiding valve valve body 8, the first motor 2 is connected with valve body 8 by right end cap 3 use screws, its motor shaft is connected with one end of spool 7 by shaft coupling 4, the second motor 18 is connected with valve body 8 by left end cap 17 use screws, its motor shaft is inserted into one end of feedback swivel nut 16, and is fixedly connected with feedback swivel nut 16 by Cock screw.The spool 7 that the first motor 2 is controlled guiding valve moves, and the feedback swivel nut 16 that the second motor 18 is controlled guiding valve moves.
In the cylinder cap 24 of oil hydraulic cylinder, be provided with oil circuit hole, cylinder cap 24 tops are provided with the first pipe joint 23, the first cored screw 22 spinnings are in the first pipe joint 23, its lower end is inserted in the oil circuit hole of cylinder cap 24, in the valve body 8 of guiding valve, be provided with oil circuit hole, valve body 8 tops are provided with the second pipe joint 9, the second cored screw 10 spinnings in the second pipe joint 9, and its lower end is inserted in the oil circuit hole of valve body 8.The middle device of the cylinder cap 24 that is mainly used for connected pipes and valve body 8 or oil pipe and oil hydraulic cylinder of pipe joint and cored screw.
One end of oil pipe C20 is connected with the first pipe joint 23, the other end is connected with oil-way integrated block 1, and one end oil-way integrated block 1 of oil pipe A19 connects, and the other end is connected with the right end cap 17 of guiding valve, oil pipe B32 one end is connected with oil-way integrated block 1, and the other end is connected with the second pipe joint 9.The effect transmission hydraulic oil of oil pipe, and prevent that hydraulic oil from being polluted.
By piston rod 25, a chamber that inner piston rod 26 forms is communicated with outside oil circuit through P mouth, by cylinder barrel 21, and cylinder cap 24, piston 28, the b chamber that piston rod 24 forms with the measuring staff 27 of magnetic hysteresis telescopic displacement sensor 30 is communicated with outside oil circuit through O mouth.
The circular area of two acting surface I faces of oil hydraulic cylinder and the annulus area of II face equate.
The spool 7 of guiding valve drives control by the first motor 2, the feedback swivel nut 16 of guiding valve drives control by the second motor 18, and oil hydraulic cylinder displacement signal is fed back to upper control system by magnetic hysteresis telescopic displacement sensor 30, be transferred to and the corresponding driver of the second motor 18 through upper control system again, driver drives the second motor 18 turns round, by the control with spool 7 the two relative movement to feedback swivel nut 16, realize the closed-loop digital control to oil hydraulic cylinder displacement.
The working principle of single rod symmetrical figure servo hydraulic cylinder of the present utility model is: oil hydraulic cylinder of the present utility model is single rod, i.e. piston rod 25.Two acting surface I faces of oil hydraulic cylinder and the area of II face are designed to equate, i.e. asymmetric cylinder.When work, the corresponding driver of upper control system control the first motor 2, driver control the first motor 2 turns round, the first motor 2 produces angular displacement, because spool 7 is connected with the motor shaft of the first motor 2 by shaft coupling 4, therefore the first motor 2 is with movable valve plug 7 to produce angular displacement, the left end of spool 7 is processed with outside thread, be screwed in the internal thread of right-hand member of feedback swivel nut 16, in the time that spool 7 rotates, because feedback swivel nut 16 is fixing by two bearings 14, can not move axially, the left end that feeds back again swivel nut 16 is connected with the second motor 18 by Cock screw, now the second motor 18 is not started working, therefore feedback swivel nut 16 can not rotate, to force spool 7 to move axially, spool 7 is with ovable valve stem 13 to produce axial displacement, open entering of valve, drainback passage, pressure oil through the opening of valve pocket 11 through the corresponding hole of manifold block 1, flow into a chamber from the P mouth of the cylinder bottom 31 of oil hydraulic cylinder, oil pressure promotes piston 28, piston 28 drives piston rod 25 to do straight-line displacement, the hydraulic oil in b chamber is discharged through O hole, magnetic hysteresis telescopic displacement sensor 30 in cylinder barrel 21 detects the shift length of piston rod 25, displacement signal is fed back to upper control system, upper control system is transferred to and the corresponding driver of the second motor 18 by signal processing again, driver is according to the displacement signal of input, controlling the second motor 18 works, the second motor 18 drives feedback swivel nut 16 to rotatablely move, sense of rotation is identical with spool 7 directions, make spool 7 slowly cycle original positions, in the time that spool 7 returns to original position, valve rod 13 close into, oil outlet, oil hydraulic cylinder stop motion, the direction of the motion of whole piston rod 25, speed and displacement are by upper control system and actuating motor or step motor control, realize the to-and-fro motion of single rod symmetrical figure servo hydraulic cylinder.
Claims (3)
1. a single rod symmetrical figure servo hydraulic cylinder, comprise motor, guiding valve, oil hydraulic cylinder, it is characterized in that: piston rod (25) inside of described oil hydraulic cylinder is provided with inner piston rod (26), inner piston rod (26) is fixedly connected with cylinder bottom (31), inner piston rod (26) and the Spielpassung of piston rod (25) for sealing, the outer wall of the cylinder bottom (31) of oil hydraulic cylinder is provided with magnetic hysteresis telescopic displacement sensor (30), magnetic hysteresis telescopic displacement sensor (30) is threaded with the cylinder bottom (31) of oil hydraulic cylinder, the measuring staff (27) of magnetic hysteresis telescopic displacement sensor (30) is positioned at the below of piston rod (25), the magnet ring (29) of magnetic hysteresis telescopic displacement sensor (30) is fixedly set on piston (28), the top of oil hydraulic cylinder is provided with manifold block (1), manifold block (1) is positioned at cylinder bottom (31) one end of oil hydraulic cylinder, one end of manifold block (1) is fixedly connected with the cylinder bottom (31) of oil hydraulic cylinder by bolt, the other end is fixedly connected with manifold block cross-brace plate (33) by bolt, be arranged with manifold block vertical supporting plate (34) in the lower end of manifold block cross-brace plate (33), manifold block vertical supporting plate (34) is fixedly connected with manifold block cross-brace plate (33) by bolt, top at manifold block (1) is provided with guiding valve, the valve body (8) of guiding valve is fixedly connected with manifold block (1) bolt, in one end of the spool (7) of guiding valve, cover has feedback swivel nut (16), feedback swivel nut (16) is threaded with spool (7), the outer surface of feedback swivel nut (16) is fixing by two bearings (14) in valve body, in the middle of two bearings (14), be provided with dottle pin (15), be arranged with the first motor (2) and the second motor (18) at the two ends of guiding valve valve body (8), the motor shaft of the first motor (2) is connected with one end of spool (7) by shaft coupling (4), the motor shaft of the second motor (18) is inserted into one end of feedback swivel nut (16), and be fixedly connected with feedback swivel nut (16) by Cock screw, in the cylinder cap (24) of oil hydraulic cylinder, be provided with oil circuit hole, cylinder cap (24) top is provided with the first pipe joint (23), the first cored screw (22) spinning is in the first pipe joint (23), its lower end is inserted in the oil circuit hole of cylinder cap (24), in the valve body (8) of guiding valve, be provided with oil circuit hole, valve body (8) top is provided with the second pipe joint (9), the second cored screw (10) spinning is in the second pipe joint (9), its lower end is inserted in the oil circuit hole of valve body (8), one end of oil pipe C (20) is connected with the first pipe joint (23), the other end is connected with manifold block (1), one end of oil pipe A (19) is connected with manifold block (1), the other end is connected with the right end cap (17) of guiding valve, oil pipe B (32) one end is connected with manifold block (1), the other end is connected with the second pipe joint (9).
2. the single rod symmetrical figure of one according to claim 1 servo hydraulic cylinder, it is characterized in that: by piston rod (25), the a chamber that inner piston rod (26) forms is communicated with outside oil circuit through P mouth, by cylinder barrel (21), cylinder cap (24), piston (28), (the b chamber that the measuring staff (27) of (30) forms is communicated with outside oil circuit through O mouth piston rod (25) with magnetic hysteresis telescopic displacement sensor.
3. the single rod symmetrical figure of one according to claim 1 servo hydraulic cylinder, is characterized in that: two acting surface I faces of oil hydraulic cylinder are equal with II face area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420163336.5U CN203784007U (en) | 2014-04-04 | 2014-04-04 | Single piston rod symmetric digital servo hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420163336.5U CN203784007U (en) | 2014-04-04 | 2014-04-04 | Single piston rod symmetric digital servo hydraulic cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN203784007U true CN203784007U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420163336.5U Expired - Fee Related CN203784007U (en) | 2014-04-04 | 2014-04-04 | Single piston rod symmetric digital servo hydraulic cylinder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438560A (en) * | 2016-10-30 | 2017-02-22 | 马鞍山市裕华机械制造有限公司 | Novel digital bending machine oil cylinder |
| CN108331799A (en) * | 2018-04-12 | 2018-07-27 | 辽宁工程技术大学 | A kind of machine feedback formula single pole symmetrical figure fluid cylinder |
| CN109781045A (en) * | 2019-01-28 | 2019-05-21 | 江阴众和电力仪表有限公司 | A kind of LPS Linear displacement transducer probing shell and its processing technology |
| CN110439876A (en) * | 2019-09-04 | 2019-11-12 | 辽宁工程技术大学 | A kind of Numeric hydraulic cylinder suitable for rocker arm body |
| CN111043099A (en) * | 2019-11-27 | 2020-04-21 | 北京航空航天大学 | Symmetrical digital hydraulic cylinder |
-
2014
- 2014-04-04 CN CN201420163336.5U patent/CN203784007U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438560A (en) * | 2016-10-30 | 2017-02-22 | 马鞍山市裕华机械制造有限公司 | Novel digital bending machine oil cylinder |
| CN108331799A (en) * | 2018-04-12 | 2018-07-27 | 辽宁工程技术大学 | A kind of machine feedback formula single pole symmetrical figure fluid cylinder |
| CN109781045A (en) * | 2019-01-28 | 2019-05-21 | 江阴众和电力仪表有限公司 | A kind of LPS Linear displacement transducer probing shell and its processing technology |
| CN110439876A (en) * | 2019-09-04 | 2019-11-12 | 辽宁工程技术大学 | A kind of Numeric hydraulic cylinder suitable for rocker arm body |
| CN110439876B (en) * | 2019-09-04 | 2024-05-17 | 辽宁工程技术大学 | Digital hydraulic cylinder suitable for rocker arm mechanism |
| CN111043099A (en) * | 2019-11-27 | 2020-04-21 | 北京航空航天大学 | Symmetrical digital hydraulic cylinder |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20210404 |