CN103939427A - Double-acting servo pressure cylinder for press machine - Google Patents
Double-acting servo pressure cylinder for press machine Download PDFInfo
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- CN103939427A CN103939427A CN201410132293.9A CN201410132293A CN103939427A CN 103939427 A CN103939427 A CN 103939427A CN 201410132293 A CN201410132293 A CN 201410132293A CN 103939427 A CN103939427 A CN 103939427A
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Abstract
A double-acting servo pressure cylinder for a press machine comprises an idle stroke device and a working stroke device. The idle stroke device is designed inside an outer cylinder body. An idler stroke servo motor rotor and planetary roller lead screw nuts are designed together. The nuts drive an inner cylinder body through rollers to reciprocate mechanically inside an idle stroke motor. The working stroke device is designed inside the inner cylinder body. A planetary reduction gear, a planetary roller lead screw device, a pressure boost cavity and a stroke cavity are sequentially arranged on the inner cylinder body from top to bottom. Both an idle stroke and a working stroke are powered by a servo motor. According to the double-acting servo pressure cylinder for the press machine, the idle stroke and the working stroke are independently controlled, energy consumption is reduced, flexibility and control precision of the press machine are improved, and the design cost of the press machine is reduced.
Description
Technical field
The present invention relates to a kind of pressurized cylinder, relate in particular to two moving servo pressurized cylinders for a kind of press machine.
Background technique
Press machine is a kind of by blank is exerted pressure, and makes blank deformation reach the pressworking equipment of needs of expected design, can realize the multiple formation techniquies such as forging and stamping, punching press, cold-extruded, drawing, and its highly versatile, is widely used in all trades and professions.According to working principle, press machine can be divided into two kinds of hydraulic press and mechanical presss, common hydraulic press is by oil pump feed, working stage hydraulic oil is always in high pressure conditions, because hollow travel stage is non-loaded, high-voltage oil liquid will be by hydrovalve and hydraulic circuit off-load, and pressure loss is all converted into heat substantially, cause hydraulic fluid temperature to raise, cause oil liquid leakage and a large amount of energy loss.Compared to hydraulic press, there is not this problem of idle stroke waste energy in mechanical press, and no-load speed is generally very fast, but mechanical press its punching press curve after manufacturing and designing is generally fixed, there is the technique of particular/special requirement for some line of buckling of liquidating, often easily there is the problem such as fold and crackle in mechanical press, and the Design and manufacture cost of mechanical press is higher, is subject to the builder's tonnage of the limit mechanical press machine of mechanical structure generally can not accomplish very large.
Along with the development of Modern Manufacturing Technology, require press machine to there is high control accuracy and speed of response, retain heavy load characteristic simultaneously, traditional mechanical press and hydraulic press, owing to there are the problems referred to above, make its application be subject to certain limitation.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide two moving servo pressurized cylinders for a kind of press machine, reduce press machine energy consumption, reduce design cost, improve press machine universal performance and control accuracy.
In order to achieve the above object, the present invention is by the following technical solutions:
Two moving servo pressurized cylinders for a kind of press machine, main body mechanism is three beam four column types, main body mechanism comprises column 2, column 2 hollows, pull bar 6 runs through column 2, column 2 smooth outer surfaces, slide block 3 slides up and down on column 2, the locking nut 7 at pull bar 6 two ends is fixed on 4 root posts 2 between crossbeam 4 and base 1, and two moving servo pressurized cylinders 5 are bolted on crossbeam 4, and two moving servo pressurized cylinder 5 piston rods are connected with slide block 3.
Described two moving servo pressurized cylinder 5, determine quantity is installed according to actual nominal pressure, two moving servo pressurized cylinders 5 comprise idle motion device and working stroke device, idle motion device comprises outer cylinder body 528, staor winding 506, mover winding 507, rotor 509, outer roller 508, upper end cap 510, lower flange 529, staor winding 506 is fixed on outer cylinder body 528, mover winding 507 is fixed on rotor 509, rotor is connected with outer cylinder body 528 by tapered roller bearing at two ends Shang Xia 509, rotor 509 is tubular, inwall is processed with multiple thread, outer roller 508 outer wall work sheet head threads, sub 509 inwalls that can rotate do planetary rotation, outer roller 508 engages with inner cylinder body 502 outer wall threads simultaneously, drive inner cylinder body 502 to move up and down at hollow travel stage rotor 509, in the middle of being, upper end cap 510 and lower flange 529 have the slab of a circular opening, outer cylinder body 528 is sealed,
Working stroke device is placed in inner cylinder body 502 inside, inner cylinder body divides two sections, upper end diameter is less than lower end, be " protruding " font, AC servo motor 516 is fixed on upper flange plate 515, upper flange plate 515 is fixed on inner cylinder body 502 upper-end surfaces, AC servo motor 516 output shafts are connected with sun gear 517, sun gear 517 engages with planet wheel 519, planet wheel 519 engages with gear ring 518, gear ring 518 is fixed on speed reducer housing 514 inwalls by upper flange plate 515 and the interior shaft shoulder of speed reducer housing 514, speed reducer housing 514 is " U " type cylindrical member, upper end open, there is through hole lower end, speed reducer housing 514 upper ends are fixed on inner cylinder body 502 upper ends, speed reducer housing 514 outer walls and inner cylinder body 502 inwall laminatings, planet wheel 519 is connected with planet retainer 521 by bearing pin 520, bearing pin 520 runs through planet wheel 519 and planet retainer 521, between planet wheel 519 and bearing pin 520, there is sliding bearing, the little axle of leading screw 527 is connected with planet retainer 521, leading screw 527 centers, upper-end surface have spherical protuberances that sun gear 517 is withstood, leading screw 527 has three place's shaft shoulders from top to bottom, planet retainer 521 lower end surfaces and the shaft shoulder laminating of the first place, the first shaft shoulder bottom, place axial plane is processed with screw thread and feed screw nut 522 screws, screw thread lower shaft surface cover has a pair of symmetrical tapered roller bearing 512 of placing, between roller bearing 512 and feed screw nut 522, there is sleeve 523, tapered roller bearing 512 inner ring upper-end surfaces are limited, tapered roller bearing 512 inner ring lower end surfaces are by leading screw the second place shaft shoulder restriction, tapered roller bearing 512 outer rings are fixed on speed reducer housing 514 lower end through-hole walls, and there is bearing (ball) cover 513 that tapered roller bearing outer ring is fixed, all processing multiple threads of part under leading screw 527 the 3rd place's shaft shoulder, with be processed with single-threaded interior roller 526 and engage, there is little axle at interior roller 526 two ends, little axle embeds in roller rolling retainer 524, roller rolling retainer 524 is ring slab, on annulus, be processed with plural isometrical circular hole, cylindrical shape small piston 525 inwalls are processed with multiple thread and engage with interior roller 526, small piston 525 outer wall upper ends embed a pair of the first anti-rotation flat key 511, be arranged symmetrically with, on inner cylinder body 502 inwalls of answering in contrast, be processed with a paragraph key groove, small piston 525 upper ends are open, lower end seals by piston end cap 530, piston end cap 530 screws by screw thread with small piston 525, large piston 531 is placed in inner cylinder body 502 lower ends, the large piston 531 bonding annular lightweight materials 504 in upper-end surface, small piston 525 lower end surfaces, inner cylinder body 502 inwalls, large piston 531 upper-end surface composition booster cavity A, in booster cavity A, be full of fluid, large piston 531 outer wall upper ends embed the second anti-rotation flat key 503, corresponding inner cylinder body 502 inwalls are processed with keyway with it, spring 532 is enclosed within on large piston 531 piston shaft, lower end cap 501 is fixed on inner cylinder body 502 lower end surfaces, large piston 531 lower end surfaces and lower end cap 501 upper surface composition backhaul chamber B.
Described rotor 509 internal threads that engage with outer roller 508 and inner cylinder body 502 outside threads are multiple thread and thread profile is 90 ° of triangle threads, and outer roller 508 outside threads are single screw thread and for circular arc thread, three's hand of thread spiral is identical; Small piston 525 internal threads that engage with interior roller 526 and leading screw 527 outside threads are multiple thread and thread profile is triangle thread, and interior roller 526 outside threads are single screw thread and for circular arc thread, three's hand of thread spiral is identical; Suppose that outer roller 508 or interior roller 526 nominal diameters are d
r, the internal thread and the outside thread that are engaged with are respectively d
nand d
w, there is relation
and
be necessary for integer, outer roller 508 or interior roller 526 thread radius of arc are
Effective effect of the present invention is:
1, idle stroke and working stroke drive separately, on rotor, drive internal pressurization cylinder to carry out the to-and-fro motion of mechanical type idle stroke planetary roller screw mechanism design, compared with conventional cylinder, have improved speed of response and motion speed.The working stroke of punching press or forging workpiece adopts large motor to drive, and has planetary reduction gear and hydraulic boosting mechanism, and whole pressurized cylinder is compact to design, and master cylinder is that hydraulic coupling drives, and stroke is very little, and the hydraulic energy of every task waste is less.
2, two band independent power moving servo pressurized cylinders are reasonably combined, can meet the requirement of different size hydraulic press.Realize the design of modularization press, can form single cylinder, twin-tub, three cylinders, four cylinders, five cylinders, six cylinders etc.By the accurate control to actuating motor, adopt the numerical control system of advanced technology on market, can realize being easily synchronized with the movement of multi-cylinder, reduce design cost.
3, idle stroke and working stroke provide power by actuating motor, and punching press curve can be adjusted arbitrarily, have improved press machine flexibility and control accuracy.
4, there is booster body to improve bearing capacity.
Brief description of the drawings
Fig. 1 is press machine front elevation.
Fig. 2 is two moving servo pressurized cylinder front sectional elevations.
Fig. 3 is two moving servo pressurized cylinder top plan view.
Fig. 4 is thread engagement detailed drawing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
With reference to Fig. 1, two moving servo pressurized cylinders for a kind of press machine, main body mechanism is three beam four column types, and main body mechanism comprises column 2, column 2 hollows, pull bar 6 runs through column 2, column 2 smooth outer surfaces, slide block 3 slides up and down on column 2, and the locking nut 7 at pull bar 6 two ends is fixed on 4 root posts 2 between crossbeam 4 and base 1, two moving servo pressurized cylinders 5 are bolted on crossbeam 4, and two moving servo pressurized cylinder 5 piston rods are connected with slide block 3.
With reference to Fig. 2 and Fig. 3, described two moving servo pressurized cylinder 5, determine quantity is installed according to actual nominal pressure, two moving servo pressurized cylinders 5 comprise idle motion device and working stroke device, idle motion device comprises outer cylinder body 528, staor winding 506, mover winding 507, rotor 509, outer roller 508, upper end cap 510, lower flange 529, staor winding 506 is fixed on outer cylinder body 528, mover winding 507 is fixed on rotor 509, rotor is connected with outer cylinder body 528 by tapered roller bearing at two ends Shang Xia 509, rotor 509 is tubular, inwall is processed with multiple thread, outer roller 508 outer wall work sheet head threads, sub 509 inwalls that can rotate do planetary rotation, outer roller 508 engages with inner cylinder body 502 outer wall threads simultaneously, drive inner cylinder body 502 to move up and down at hollow travel stage rotor 509, in the middle of being, upper end cap 510 and lower flange 529 have the slab of a circular opening, outer cylinder body 528 is sealed,
Working stroke device is placed in inner cylinder body 502 inside, inner cylinder body divides two sections, upper end diameter is less than lower end, be " protruding " font, inner cylinder body 502 is planetary reduction gear from top to bottom successively, planetary roller screw device, booster cavity, backhaul chamber, AC servo motor 516 is bolted on upper flange plate 515, upper flange plate 515 is fixed by screws in inner cylinder body 502 upper-end surfaces, AC servo motor 516 output shafts connect with sun gear 517 by flat key, sun gear 517 engages with planet wheel 519, planet wheel 519 engages with gear ring 518, gear ring 518 is fixed on speed reducer housing 514 inwalls by upper flange plate 515 and the interior shaft shoulder of speed reducer housing 514, speed reducer housing 514 is " U " type cylindrical member, upper end open, there is through hole lower end, speed reducer housing 514 upper ends are bolted on inner cylinder body 502 upper ends, speed reducer housing 514 outer walls and inner cylinder body 502 inwall laminatings, planet wheel 519 is connected with planet retainer 521 by bearing pin 520, bearing pin 520 runs through planet wheel 519 and planet retainer 521, between planet wheel 519 and bearing pin 520, there is sliding bearing, the little axle of leading screw 527 is connected with planet retainer 521 by flat key, leading screw 527 centers, upper-end surface have spherical protuberances that sun gear 517 is withstood, leading screw 527 has three place's shaft shoulders from top to bottom, planet retainer 521 lower end surfaces and the shaft shoulder laminating of the first place, the first shaft shoulder bottom, place axial plane is processed with screw thread and feed screw nut 522 screws, screw thread lower shaft surface cover has a pair of symmetrical tapered roller bearing 512 of placing, between roller bearing 512 and feed screw nut 522, there is sleeve 523, tapered roller bearing 512 inner ring upper-end surfaces are limited, tapered roller bearing 512 inner ring lower end surfaces are by leading screw the second place shaft shoulder restriction, tapered roller bearing 512 outer rings are fixed on speed reducer housing 514 lower end through-hole walls, and there is bearing (ball) cover 513 that tapered roller bearing outer ring is fixed, all processing multiple threads of part under leading screw 527 the 3rd place's shaft shoulder, with be processed with single-threaded interior roller 526 and engage, there is little axle at interior roller 526 two ends, little axle embeds in roller rolling retainer 524, roller rolling retainer 524 is processed with multiple isometrical circular holes on ring slab annulus, cylindrical shape small piston 525 inwalls are processed with multiple thread and engage with interior roller 526, small piston 525 outer wall upper ends embed a pair of the first anti-rotation flat key 511, be arranged symmetrically with, on inner cylinder body 502 inwalls of answering in contrast, be processed with a paragraph key groove, small piston 525 upper ends are open, lower end seals by piston end cap 530, piston end cap 530 screws by screw thread with small piston 525, large piston 531 is placed in inner cylinder body 502 lower ends, large piston upper-end surface bonding certain thickness annular lightweight material 504, small piston 525 lower end surfaces, inner cylinder body 502 inwalls, large piston 531 upper-end surface composition booster cavity A, in booster cavity A, be full of fluid, large piston 531 outer wall upper ends embed the second anti-rotation flat key 503, corresponding inner cylinder body 502 inwalls are processed with keyway with it, spring 532 is enclosed within on large piston 531 piston shaft, lower end cap 501 is fixed by screws in inner cylinder body 502 lower end surfaces, large piston 531 lower end surfaces and lower end cap 501 upper surface composition backhaul chamber B.
With reference to Fig. 4, rotor 509 internal threads that engage with outer roller 508 and inner cylinder body 502 outside threads are multiple thread and thread profile is 90 ° of triangle threads (α angles), outer roller 508 outside threads are single screw thread and for circular arc thread, three's hand of thread spiral is identical; Small piston 525 internal threads that engage with interior roller 526 and leading screw 527 outside threads are multiple thread and thread profile is triangle thread, and interior roller 526 outside threads are single screw thread and for circular arc thread, three's hand of thread spiral is identical; Suppose that outer roller 508 or interior roller 526 nominal diameters are d
r, the internal thread and the outside thread that are engaged with are respectively d
nand d
w, there is relation
and
be necessary for integer, outer roller 508 or interior roller 526 thread radius of arc are
Working principle of the present invention is: hollow travel stage, rotor 509 starts to rotate under the electromagnetic force of mover winding 507, drive outer roller 508 to make planetary rotation, because rotor 509 and outer roller 508 axial freedoms are limited, piston 531 is connected and circumferentially can not rotates with slide block 3, has again the existence of anti-rotation flat key 503, the circumferential degrees of freedom of inner cylinder body 502 is limited, inner cylinder body 502 can only move up and down, and this motion stage is non-loaded, adopts small-power when design motor.The working stroke stage, AC servo motor 516 is by planetary reduction gear and planetary roller screw device, drive small piston 525 to move downward, owing to there being the restriction of the first anti-rotation flat key 511, small piston 525 can only move up and down and can not rotate, small piston 525 basal areas are less than large piston 531 top surface area, power on small piston 525 has obtained amplification be delivered to large piston 531 after the fluid in booster cavity A after, magnification factor is large piston 531 upper surfaces and the ratio of small piston 530 lower surface areas, large piston 531 piston rods promote slide block 3 and move downward, complete nominal working stroke.The return stage, AC servo motor 516 is reversed, drive small piston 525 to move upward, booster cavity A inner fluid pressure decreased, spring 532 in backhaul chamber promotes large piston 531 in compressive state and moves upward, rotor 509 reversions in idle motion device drive inner cylinder body 502 to move upward, and get back to initial position.
Claims (3)
1. two moving servo pressurized cylinders for press machine, it is characterized in that: main body mechanism is three beam four column types, main body mechanism comprises column (2), column (2) hollow, pull bar (6) runs through column (2), column (2) smooth outer surface, slide block (3) slides up and down on column (2), the locking nut (7) at pull bar (6) two ends is fixed on 4 root posts (2) between crossbeam (4) and base (1), it is upper that two moving servo pressurized cylinders (5) are bolted on crossbeam (4), and two moving servo pressurized cylinder (5) piston rods are connected with slide block (3).
2. two moving servo pressurized cylinders for a kind of press machine according to claim 1, it is characterized in that: described two moving servo pressurized cylinder (5), determine quantity is installed according to actual nominal pressure, two moving servo pressurized cylinders (5) comprise idle motion device and working stroke device, idle motion device comprises outer cylinder body (528), staor winding (506), mover winding (507), rotor (509), outer roller (508), upper end cap (510), lower flange (529), staor winding (506) is fixed on outer cylinder body (528), mover winding (507) is fixed on rotor (509), the upper and lower two ends of rotor (509) are connected with outer cylinder body (528) by tapered roller bearing, rotor (509) is tubular, inwall is processed with multiple thread, outer roller (508) outer wall work sheet head thread, son (509) inwall that can rotate does planetary rotation, outer roller (508) engages with inner cylinder body (502) outer wall thread simultaneously, drive inner cylinder body (502) to move up and down at hollow travel stage rotor (509), in the middle of being, upper end cap (510) and lower flange (529) have the slab of a circular opening, outer cylinder body (528) is sealed,
Working stroke device is placed in inner cylinder body (502) inside, inner cylinder body divides two sections, upper end diameter is less than lower end, be " protruding " font, AC servo motor (516) is fixed on upper flange plate (515), upper flange plate (515) is fixed on inner cylinder body (502) upper-end surface, AC servo motor (516) output shaft is connected with sun gear (517), sun gear (517) engages with planet wheel (519), planet wheel (519) engages with gear ring (518), gear ring (518) is fixed on speed reducer housing (514) inwall by upper flange plate (515) and the interior shaft shoulder of speed reducer housing (514), speed reducer housing (514) is " U " type cylindrical member, upper end open, there is through hole lower end, speed reducer housing (514) upper end is fixed on inner cylinder body (502) upper end, speed reducer housing (514) outer wall and the laminating of inner cylinder body (502) inwall, planet wheel (519) is connected with planet retainer (521) by bearing pin (520), bearing pin (520) runs through planet wheel (519) and planet retainer (521), between planet wheel (519) and bearing pin (520), there is sliding bearing, the little axle of leading screw (527) is connected with planet retainer (521), leading screw (527) center, upper-end surface has spherical protuberances that sun gear (517) is withstood, leading screw (527) has three place's shaft shoulders from top to bottom, planet retainer (521) lower end surface and the shaft shoulder laminating of the first place, the first shaft shoulder bottom, place axial plane is processed with screw thread and feed screw nut (522) screws, screw thread lower shaft surface cover has a pair of symmetrical tapered roller bearing (512) of placing, between roller bearing (512) and feed screw nut (522), there is sleeve (523), tapered roller bearing (512) inner ring upper-end surface is limited, tapered roller bearing (512) inner ring lower end surface is by leading screw the second place shaft shoulder restriction, tapered roller bearing (512) outer ring is fixed on the through-hole wall of speed reducer housing (514) lower end, and there is bearing (ball) cover (513) that tapered roller bearing outer ring is fixed, all processing multiple threads of part under leading screw (527) the 3rd place's shaft shoulder, with be processed with single-threaded interior roller (526) and engage, there is little axle at interior roller (526) two ends, little axle embeds in roller rolling retainer (524), roller rolling retainer (524) is ring slab, on annulus, be processed with plural isometrical circular hole, cylindrical shape small piston (525) inwall is processed with multiple thread and engages with interior roller (526), small piston (525) outer wall upper end embeds a pair of the first anti-rotation flat key (511), be arranged symmetrically with, on inner cylinder body (502) inwall of answering in contrast, be processed with a paragraph key groove, small piston (525) upper end is open, lower end is by piston end cap (530) sealing, piston end cap (530) screws by screw thread with small piston (525), large piston (531) is placed in inner cylinder body (502) lower end, large piston (531) the bonding annular lightweight material in upper-end surface (504), small piston (525) lower end surface, inner cylinder body (502) inwall, large piston (531) upper-end surface composition booster cavity A, in booster cavity A, be full of fluid, large piston (531) outer wall upper end embeds the second anti-rotation flat key (503), corresponding inner cylinder body (502) inwall is processed with keyway with it, spring (532) is enclosed within on large piston (531) piston shaft, lower end cap (501) is fixed on inner cylinder body (502) lower end surface, large piston (531) lower end surface and lower end cap (501) upper surface composition backhaul chamber B.
3. two moving servo pressurized cylinders for a kind of press machine according to claim 2, it is characterized in that: described rotor (509) internal thread engaging with outer roller (508) and inner cylinder body (502) outside thread are multiple thread and thread profile is 90 ° of triangle threads, outer roller (508) outside thread is single screw thread and for circular arc thread, three's hand of thread spiral is identical; Small piston (525) internal thread engaging with interior roller (526) and leading screw (527) outside thread is multiple thread and thread profile is triangle thread, interior roller (526) outside thread is single screw thread and for circular arc thread, three's hand of thread spiral is identical; Suppose that outer roller (508) or interior roller (526) nominal diameter are d
r, the internal thread and the outside thread that are engaged with are respectively d
nand d
w, there is relation
and
be necessary for integer, outer roller (508) or interior roller (526) thread radius of arc are
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132293.9A CN103939427B (en) | 2014-04-02 | 2014-04-02 | The two dynamic servo pressurized cylinder of a kind of press machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132293.9A CN103939427B (en) | 2014-04-02 | 2014-04-02 | The two dynamic servo pressurized cylinder of a kind of press machine |
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| Publication Number | Publication Date |
|---|---|
| CN103939427A true CN103939427A (en) | 2014-07-23 |
| CN103939427B CN103939427B (en) | 2016-01-20 |
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|---|---|---|---|
| CN201410132293.9A Expired - Fee Related CN103939427B (en) | 2014-04-02 | 2014-04-02 | The two dynamic servo pressurized cylinder of a kind of press machine |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454803A (en) * | 2014-10-30 | 2015-03-25 | 西安交通大学 | Mechanical and hydraulic composite energy-saving cylinder for long idle stroke and short pressure stroke |
| CN106523442A (en) * | 2016-11-10 | 2017-03-22 | 郑州磨料磨具磨削研究所有限公司 | Super-high-pressure spiral servo pressurizer |
| CN107152506A (en) * | 2017-06-06 | 2017-09-12 | 北京航空航天大学 | Pressure self-balancing formula electromechanical servo acting device under a kind of hyperbaric environment |
| CN107605825A (en) * | 2017-09-12 | 2018-01-19 | 江苏理工学院 | A kind of large hydraulic press crossbeam electrical servo levelling device |
| CN108644357A (en) * | 2018-07-06 | 2018-10-12 | 哈尔滨理工大学 | A kind of transmission device of experiment continuous internal mixer |
| CN109550399A (en) * | 2018-12-10 | 2019-04-02 | 中国矿业大学 | A kind of high throughput rotator type energy recycle device |
| CN109849398A (en) * | 2019-01-16 | 2019-06-07 | 陕西理工大学 | A kind of arbitrarily adjustable spiral servo press machine of screw pitch |
| CN112935046A (en) * | 2021-01-25 | 2021-06-11 | 东北林业大学 | Servo electronic press based on planet roller lead screw |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454803A (en) * | 2014-10-30 | 2015-03-25 | 西安交通大学 | Mechanical and hydraulic composite energy-saving cylinder for long idle stroke and short pressure stroke |
| CN106523442A (en) * | 2016-11-10 | 2017-03-22 | 郑州磨料磨具磨削研究所有限公司 | Super-high-pressure spiral servo pressurizer |
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| CN107605825A (en) * | 2017-09-12 | 2018-01-19 | 江苏理工学院 | A kind of large hydraulic press crossbeam electrical servo levelling device |
| CN107605825B (en) * | 2017-09-12 | 2019-02-15 | 江苏理工学院 | A kind of large hydraulic press crossbeam electrical servo levelling device |
| CN108644357A (en) * | 2018-07-06 | 2018-10-12 | 哈尔滨理工大学 | A kind of transmission device of experiment continuous internal mixer |
| CN109550399A (en) * | 2018-12-10 | 2019-04-02 | 中国矿业大学 | A kind of high throughput rotator type energy recycle device |
| CN109550399B (en) * | 2018-12-10 | 2023-09-19 | 中国矿业大学 | High-throughput rotor type energy recovery device |
| CN109849398A (en) * | 2019-01-16 | 2019-06-07 | 陕西理工大学 | A kind of arbitrarily adjustable spiral servo press machine of screw pitch |
| CN112935046A (en) * | 2021-01-25 | 2021-06-11 | 东北林业大学 | Servo electronic press based on planet roller lead screw |
| CN112935046B (en) * | 2021-01-25 | 2022-10-21 | 东北林业大学 | Servo electronic press based on planet roller lead screw |
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|---|---|
| CN103939427B (en) | 2016-01-20 |
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