CN202732551U - Electro-hydraulic stepping cylinder - Google Patents
Electro-hydraulic stepping cylinder Download PDFInfo
- Publication number
- CN202732551U CN202732551U CN 201220338939 CN201220338939U CN202732551U CN 202732551 U CN202732551 U CN 202732551U CN 201220338939 CN201220338939 CN 201220338939 CN 201220338939 U CN201220338939 U CN 201220338939U CN 202732551 U CN202732551 U CN 202732551U
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- piston
- stepper motor
- servovalve
- ball screw
- cylinder
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Abstract
The utility model relates to an electro-hydraulic stepping cylinder for the oscillation technology of a continuous casting crystallizer. The electro-hydraulic stepping cylinder comprises a single-output rod hydraulic cylinder, a three-way bilateral throttling servo valve, a stepping motor, a stepping motor driver and an optical-electricity encoder, and is characterized in that the servo valve is installed on a piston of the hydraulic cylinder, the servo motor and a connection oil path of a rod cavity and a rodless cavity of the hydraulic cylinder are placed on the piston, a valve bush of the servo valve is fixed on the piston, a valve plug can only axially move through a bulge matched with a sliding groove in the piston, the stepping motor and the optical-electricity encoder are installed on a rear end cover of the hydraulic cylinder, a transmission gear pair of the stepping motor drives the valve plug of the servo valve through a ballscrew pair, the ballscrew pair can be installed outside or inside the hydraulic cylinder as required, and the optical-electricity encoder forms a motor closed-loop control circuit through a shaft gear of the encoder meshed with a transmission shaft gear. The electro-hydraulic stepping cylinder is compact in structure and small in volume; and the ballscrew pair is shortened in length, the performance is stable, the sealing performance is good, and abrasion is not easily caused.
Description
Technical field
The utility model relates to the hydraulics field, particularly a kind of electro-hydraulic stepping cylinder of continuous cast mold vibration usefulness.
Background technique
In the continuous-casting of steel billet production line, the rate of throwing the manufacturing efficiency of whole production line, and the application of Oscillation Technique of Mould has improved casting speed greatly, so mould vibration device must satisfy the relevant art requirement.In existing mould vibration device, the application of hydraulic system is increasingly extensive.The shortcomings such as cost is high because traditional servo valve-controlled cylinder system exists, rate of fault and maintenance cost height replace electric liquid stepping (numeral) cylinder device that it is lower by cost, contamination resistance is stronger.
The electric liquid step cylinder that uses at present is made of mechanical part, hydraulic part and feedback means, and wherein mechanical part comprises stepper motor and mechanical transmission mechanism thereof, and hydraulic part comprises asymmetric servo cylinder and servovalve, and feedback means comprises photoelectric encoder.The servovalve of this electric liquid step cylinder is installed in the outside of oil hydraulic cylinder, has following shortcoming: the one, and the oil hydraulic cylinder rear end cover structure is complicated, and needs the peripheral hardware oil pipe, makes the volume of oil hydraulic cylinder larger; The 2nd, the rotation of stepper motor is converted to the straight-line ball screw pair length of valve core of servo valve longer, stability requirement is higher, and the sealing difficulty is easy to wear.
The model utility content
The purpose of this utility model is improved for the shortcoming of above-mentioned prior art, provides that a kind of compact structure, volume are little, ball screw good airproof performance, nonabradable electric liquid step cylinder.
For achieving the above object, the electric liquid step cylinder that the utility model provides comprises asymmetric servo cylinder, servovalve, stepper motor, stepper motor driver and photoelectric encoder; It is characterized in that, described servovalve is the bilateral throttling type servovalve of threeway, this servovalve is installed on the piston of oil hydraulic cylinder, servovalve and oil hydraulic cylinder rod chamber, the connection oil circuit of rodless cavity places on the piston, the valve pocket of servovalve is fixed on the piston, projection is arranged on the spool, the chute that matches with this projection is arranged on the piston, stepper motor and photoelectric encoder are installed on the rear end cover of oil hydraulic cylinder, the stepper motor driving gear pair that is made of stepper motor shaftgear and shaft gear is by the spool of ball screw auxiliary driving servovalve, and the photoelectric encoder shaftgear is meshed with shaft gear.
The Placement of described ball screw pair and stepper motor driving gear pair has two kinds: a kind of is the external form of ball screw pair, the ball nut that is about to ball screw pair is fixedly connected with the shaft gear of stepper motor driving gear pair and is integral, ball screw is fixedly connected with drive link is concentric, and drive link is fixedly connected with spool; Another kind is the built-in form of ball screw pair, and namely the shaft gear of stepper motor driving gear pair is fixedly connected with the ball screw of ball screw pair by transmission shaft, and ball nut is fixedly connected with the spool of servovalve.
Compare with above-mentioned prior art, the utlity model has following advantage:
1, servovalve adopts built-in form, does not need external oil circuit, makes the electric liquid step cylinder compact overall structure, volume-diminished;
2, ball screw pair length obviously shortens, stable performance, and good airproof performance, not easy to wear, long service life.
Description of drawings
Fig. 1 is the structural drawing of the external electric liquid step cylinder of ball screw pair;
Fig. 2 is the structural drawing of the built-in electric liquid step cylinder of ball screw pair.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment 1
The present embodiment is the external electric liquid step cylinder of ball screw pair.As shown in Figure 1, this electric liquid step cylinder is comprised of asymmetric servo cylinder, servovalve, stepper motor 11, stepper motor driver 12 and photoelectric encoder 18; Wherein stepper motor and photoelectric encoder are installed on the rear end cover 8 of oil hydraulic cylinder by stepper motor supporting base 9 and photoelectric encoder supporting base 20 respectively.Stepper motor adopts five phase composite stepper motors, joins with stepper motor driver.Asymmetric servo cylinder is comprised of piston 28, seal sleeve of piston rod 1, piston rod guide sleeve 2, front cover 3, cylinder barrel 26, piston guide cover 4, inner sliding sleeve 5 and rear end cover 8; Circular inner hole is offered in center portion, rear end at piston vertically, and servovalve is installed in the hole.Servovalve adopts the bilateral throttling servovalve of threeway, the valve pocket 7 of servovalve is fixed on the inner hole wall of piston, there is projection spool 6 outsides, the chute that matches with this projection is arranged on the piston, can only endwisely slip and can not rotate along piston by projection and chute spool, by boring servovalve being set in the piston is connected with rodless cavity with the oil hydraulic cylinder rod chamber and is connected oil circuit, this connection oil circuit comprises the filler opening 27 that is opened on the cylinder barrel, oil duct and stop up 24 and return opening 25, the spool 6 of servovalve is fixedly connected with drive link 22, drive link passes through valve end cap 23, transmission shaft 16, be installed in ball screw 15 concentric being fixedly connected with of transmission shaft bearing 19 and ball screw pair on the oil hydraulic cylinder rear end cover 8, stepper motor shaftgear 10 and shaft gear 13 form the stepper motor driving gear pair, wherein shaft gear 13 is fixedly connected with the ball nut 14 of ball screw pair and is integral, drive ball nut and rotate together, drive the spool axial motion of servovalve by ball screw and drive link.Photoelectric encoder shaftgear 17 is meshed with shaft gear 13, in order to consist of the Closed-Loop Control of Stepping Motor loop.Offer leakage oil duct and oilhole 21 at the oil hydraulic cylinder rear end cover, in order to get rid of leakage of oil.
The working principle of this electric liquid step cylinder is, stepper motor drives ball nut by driving gear pair and rotates, ball nut drives ball screw and does axial motion together with drive link, drive link drives the spool axial motion, spool moves the servovalve valve port is changed, if valve port makes the oil hydraulic cylinder rodless cavity be communicated with rod chamber, then rodless cavity pressure raises, thereby the power that rodless cavity pressure oil is acted on the piston acts on power on the piston greater than rod chamber pressure oil, and piston is protruding.Because valve pocket is fixed on the piston, the drive valve pocket that stretches out of piston is closed the servovalve valve port, and when piston walked to new balance position, valve port was closed fully; In like manner, if the variation of valve port is connected oil hydraulic cylinder rodless cavity and oil back chamber, rodless cavity pressure drop then, thereby the power that rodless cavity pressure oil is acted on the piston acts on power on the piston less than rod chamber pressure oil, piston is retracted under this active force, because valve pocket is fixed on the piston, the retraction movement of piston drives valve pocket closes the servovalve valve port, when piston-retraction arrived new equilibrium position, valve port was closed fully.
For improving control accuracy, reduce losing the step of stepper motor, consist of the Closed-Loop Control of Stepping Motor loop by photoelectric encoder and stepper motor driver.Movement velocity and displacement that photoelectric encoder records piston rod by detecting the actual angle that turns over of shaft gear, vibrational waveform according to continuous cast mold different operating needs, work out corresponding program and be defeated by controllor for step-by-step motor, controllor for step-by-step motor is translated into the different positive or negative pulse signal of a series of frequencies to program and is defeated by stepper motor, the spool that is driven servovalve by stepper motor produces displacement with identical frequency and direction, the control hydraulic cylinder piston is made step motion on request, satisfies the requirement of continuous cast mold vibratory process.
Embodiment 2
The present embodiment is the built-in electric liquid step cylinder of ball screw pair.As shown in Figure 2, the ball screw pair of this electric liquid step cylinder is installed in oil hydraulic cylinder inside, simultaneously ball nut is rotated and become the ball screw rotation, its concrete structure is: the spool 11 of the ball nut 9 of ball screw pair ' by bolt and servovalve '. be fixedly connected with and be integral, ball screw 8 ' with transmission shaft 13 ' concentric being fixedly connected with, transmission shaft by be installed in oil hydraulic cylinder rear end cover 21 ' on transmission shaft bearing 14 ' with the shaft gear 18 of stepper motor driving gear pair ' be fixedly connected with.Shaft gear rotates by transmission shaft 13 ' drive ball screw, and ball screw moves axially by the spool that ball nut drives servovalve.Other structure of this electricity liquid oil hydraulic cylinder, comprise seal sleeve of piston rod 1 ', piston rod guide sleeve 2 ', front cover 3 ', cylinder barrel 4 ', piston 5 ', piston guide cover 6 ', inner sliding sleeve 7 ', valve pocket 10 ', valve end cap 12 ', stepper motor 15 ', stepper motor driver 16 ', stepper motor shaftgear 17 ', photoelectric encoder shaftgear 19 ', photoelectric encoder 20 ', leak oil duct and hydraulic fluid port 22 ', return opening 23 ', filler opening 24 ', stepper motor supporting base 25 ', photoelectric encoder supporting base 26 ' etc. all identical with embodiment 1.Working principle is also identical with embodiment 1.
Embodiment's 2 electric liquid step cylinders, because ball screw pair is installed in the inside of built-in valve core of servo valve, it is too little that built-in servovalve and piston can not be done, and is applicable to large-scale electric liquid step cylinder.
Embodiment's 1 electric liquid step cylinder, because ball screw pair is installed on the oil hydraulic cylinder rear end cover, the size of built-in servovalve and piston is unrestricted, but it is elongated to transmit the drive link of built-in valve core of servo valve motion, can not bear larger load, therefore it is applicable to the small electrical liquid step cylinder.
Claims (3)
1. an electric liquid step cylinder comprises asymmetric servo cylinder, servovalve, stepper motor (11), stepper motor driver (12) and photoelectric encoder (18); It is characterized in that, described servovalve is the bilateral throttling type servovalve of threeway, this servovalve is installed on the piston (28) of oil hydraulic cylinder, servovalve and oil hydraulic cylinder rod chamber, the connection oil circuit (24 of rodless cavity, 25,27) place on the piston, the valve pocket of servovalve (7) is fixed on the piston, spool has projection on (6), the chute that matches with this projection is arranged on the piston, stepper motor and photoelectric encoder are installed on the rear end cover (8) of oil hydraulic cylinder, passed through the spool of ball screw auxiliary driving servovalve by the stepper motor driving gear pair of stepper motor shaftgear (10) and shaft gear (13) formation, photoelectric encoder shaftgear (17) is meshed with shaft gear (13).
2. electric liquid step cylinder according to claim 1, it is characterized in that, described ball screw pair with the Placement of stepper motor driving gear pair is: the ball nut of ball screw pair (14) is fixedly connected with the shaft gear (13) of stepper motor driving gear pair and is integral, ball screw (15) and concentric being fixedly connected with of drive link (22), drive link is fixedly connected with spool.
3. electric liquid step cylinder according to claim 1, it is characterized in that, described ball screw pair with the Placement of stepper motor driving gear pair is: the shaft gear of stepper motor driving gear pair (18 ') is fixedly connected with the ball screw (8 ') of ball screw pair by transmission shaft (13 '), and ball nut (9 ') is fixedly connected with the spool (11 ') of servovalve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338939 CN202732551U (en) | 2012-07-12 | 2012-07-12 | Electro-hydraulic stepping cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220338939 CN202732551U (en) | 2012-07-12 | 2012-07-12 | Electro-hydraulic stepping cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202732551U true CN202732551U (en) | 2013-02-13 |
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ID=47658253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220338939 Expired - Fee Related CN202732551U (en) | 2012-07-12 | 2012-07-12 | Electro-hydraulic stepping cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN202732551U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727094A (en) * | 2014-01-26 | 2014-04-16 | 重庆市巴山液压附件厂有限公司 | Electro-hydraulic servo numerical control push rod device |
| CN107701526A (en) * | 2016-08-09 | 2018-02-16 | 玛珂系统分析和开发有限公司 | Pressure converter |
| CN108757183A (en) * | 2018-06-29 | 2018-11-06 | 江苏金陵智造研究院有限公司 | A kind of novel turbojet engine fuel regulator valve |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
| CN109848379A (en) * | 2019-02-26 | 2019-06-07 | 中煤科工集团上海有限公司 | A kind of mold oscillation oil cylinder |
| CN110195729A (en) * | 2019-05-27 | 2019-09-03 | 辽宁工程技术大学 | A kind of built-in digital fluid cylinder of spool |
| CN112112864A (en) * | 2020-10-12 | 2020-12-22 | 辽宁工程技术大学 | Load pressure control type digital fluid cylinder |
-
2012
- 2012-07-12 CN CN 201220338939 patent/CN202732551U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727094A (en) * | 2014-01-26 | 2014-04-16 | 重庆市巴山液压附件厂有限公司 | Electro-hydraulic servo numerical control push rod device |
| CN107701526A (en) * | 2016-08-09 | 2018-02-16 | 玛珂系统分析和开发有限公司 | Pressure converter |
| CN108757183A (en) * | 2018-06-29 | 2018-11-06 | 江苏金陵智造研究院有限公司 | A kind of novel turbojet engine fuel regulator valve |
| CN109848379A (en) * | 2019-02-26 | 2019-06-07 | 中煤科工集团上海有限公司 | A kind of mold oscillation oil cylinder |
| CN109848379B (en) * | 2019-02-26 | 2024-04-30 | 中煤科工集团上海有限公司 | Crystallizer vibrating cylinder |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
| CN110195729A (en) * | 2019-05-27 | 2019-09-03 | 辽宁工程技术大学 | A kind of built-in digital fluid cylinder of spool |
| CN112112864A (en) * | 2020-10-12 | 2020-12-22 | 辽宁工程技术大学 | Load pressure control type digital fluid cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20170712 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |