CN105057432B - Hydraulic extension cushion with planetary roller screw driven by alternating-current servo synchronous motor - Google Patents

Hydraulic extension cushion with planetary roller screw driven by alternating-current servo synchronous motor Download PDF

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Publication number
CN105057432B
CN105057432B CN201510548911.2A CN201510548911A CN105057432B CN 105057432 B CN105057432 B CN 105057432B CN 201510548911 A CN201510548911 A CN 201510548911A CN 105057432 B CN105057432 B CN 105057432B
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China
Prior art keywords
cylinder
piston
servo synchronous
synchronous motor
valve core
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Expired - Fee Related
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CN201510548911.2A
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Chinese (zh)
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CN105057432A (en
Inventor
赵升吨
王泽阳
范淑琴
李靖祥
钟玮
王威
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN201510548911.2A priority Critical patent/CN105057432B/en
Publication of CN105057432A publication Critical patent/CN105057432A/en
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Publication of CN105057432B publication Critical patent/CN105057432B/en
Expired - Fee Related legal-status Critical Current
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Abstract

Disclosed is a hydraulic extension cushion with a planetary roller screw driven by an alternating-current servo synchronous motor. A pneumatic control valve core structure of a core mechanism controlling blank holding force is replaced by a valve core structure driven by the alternating-current servo synchronous motor, and the valve core structure is higher in accuracy and responding speed; the structure is simple and compact, and the failure rate is low; the valve core structure design has a buffering capacity, the problem of too large blank holding force at the initial moment of stamping can be solved, and meanwhile, a main valve core is protected against damage. A pressure sensor is arranged in a piston cavity, and the alternating-current servo synchronous motor can be adjusted conveniently according to instantaneous pressure conditions, accordingly valve core displacement is controlled accurately, accurate control over the blank holding force is achieved, and the whole forms a closed loop system. The alternating-current servo synchronous motor drives a screw to rotate through deceleration, then the rotation is converted into the linear motion of the valve core through a planetary roller pair, the alternating-current servo synchronous motor is used for controlling the displacement of the valve core in a closed-loop mode, and accordingly accurate blank holding force adjustment can be achieved.

Description

A kind of hydraulic tensioning pad of AC servo synchronous machine drives planetary roller screw
Technical field
The invention belongs to forcing press stretching pad technical field is and in particular to a kind of AC servo synchronous machine drives planet rolls The hydraulic tensioning pad of post leading screw.
Background technology
On producing when carrying out deep drawing of sheet operation, often need to push down the edge of work, prevent wrinkling.On baby press Standing have spring or rubber flange fixing installation, and the pressure-pad-force that this flange fixing installation is provided can not be too big and unadjustable;Big In the drawing of type or depth, then frequently with air cushion or hydropneumatic cushion.Traditional hydropneumatic cushion is hydraulic cylinder as supporting pad, hydraulic cylinder The work valve rod that the turnover of interior hydraulic oil is controlled by air pressure determines.Control the piston in cylinder using air slide valve, thus controlling The motion of the work valve rod that system is connected with piston, completes the opening and closing of service valve, and then controls liquid in hydraulic working cylinder Being filled with and discharging of force feed, pads displacement and the control of pressure-pad-force to realize stretching.The complex structure of this hydropneumatic cushion, manufactures work Work amount is big.And the valve rod being controlled by air pressure is difficult to its position of precise control it is impossible to the control valve openings of sizes of quantitation, also just not The size of pressure-pad-force can be accurately controlled.
Content of the invention
In order to overcome above-mentioned existing technical disadvantages, object of the present invention is to provide a kind of AC servo synchronous motor Drive the hydraulic tensioning pad of planetary roller screw, structure is simple, and fault rate is low, the position control of work valve rod is accurate.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of hydraulic tensioning pad of AC servo synchronous machine drives planetary roller screw, including four being arranged symmetrically two-by-two Individual AC servo synchronous motor 1, the output shaft of AC servo synchronous motor 1 passes through planetary reduction gear with planetary lead-screw 8 one end even Connect, planetary lead-screw 8 is connected with planet nut 12, planet nut 12 is fixedly connected and is simultaneously attached to first set with push rod 16 lower end In cylinder 17, the shell 19-8 lower end of push rod 16 upper end and valve core structure 19 is fixed, outside the first sleeve 17 lower end and planetary reduction gear Shell 7 is fixedly connected, and the first sleeve 17 upper end is fixedly connected with base 21, the first sleeve 17 has external oil circuit interface 18 and connects Hydraulic circuit, base 21 is arranged symmetrically in around lower mould 30 two-by-two, and is fixed on workbench 29, and valve seat 20 is fixed on In groove in the middle of base 21, have through hole in the middle of valve seat 20, through hole upper end is connected with the inner chamber of lower cylinder body 22, lower end and first set The inner chamber of cylinder 17 connects, and the shell 19-8 upper end cooperation with valve core structure 19, and lower cylinder body 22 lower end is fixed on base 21, under Cylinder body 22 upper end is provided with bumper 24, and lower cylinder body 22 outer wall is cased with upper cylinder body 25, and the lower end of upper cylinder body 25 is fixed with limiting block Block 23, the upper end of upper cylinder body 25 is provided with the second end cap 27 and supporting pad 28, is provided with pressure sensing in the second end cap 27 side wall Device 26, in upper cylinder body 25 inner chamber that the inductive connector of pressure sensor 26 extend into, during work, lower cylinder body 22 and upper cylinder body 25 It is filled with hydraulic oil in inner chamber.
Described valve core structure 19 includes main valve plug 19-1, and main valve plug 19-1 lower end is connected with upper piston 19-3, and by big spiral shell Female 19-6 is fixed, upper piston 19-3 and lower piston 19-9 by be separated into inside shell 19-8 epicoele 19-2, lumen 19-5, under Chamber 19-7, equipped with ladder choke valve 19-4 and check valve 19-10 on upper piston 19-3, when upper piston 19-3 is descending hydraulic oil from Lumen 19-5 flows back to epicoele 19-2 through ladder choke valve 19-4, and when upper piston 19-3 backhaul is up, hydraulic oil is from epicoele 19-2 warp Lumen 19-5 is back to by check valve 19-10;Compressed air suits in cavity of resorption 19-7, when lower piston 19-9 is descending, compression Cavity of resorption gas, completes to recover initial position by gas tension when lower piston 19-9 backhaul, shell 19-8 upper end is fixed with Flange 19-11, shell 19-8 outer wall is cased with spring 19-12, and spring 19-12 upper end withstands on main valve plug 19-1, and lower end withstands on and pushes away On bar 16.
The size of pressure-pad-force is determined by the openings of sizes between main valve plug 19-1 and valve seat 20, according to punching course to pressure-pad-force The requirement of curve, thus drawing the pressure curve of hydraulic oil in upper cylinder body 25, and then obtains the displacement curve of main valve plug 19-1, from And obtain the working curve of AC servo synchronous motor 1, immediately detect the pressure in upper cylinder body 25 via pressure sensor 26, lead to Cross the closed loop that pressure-pad-force in the displacement to main valve plug 19-1 and punching course is realized in the control to AC servo synchronous motor 1 Control.
Remove lower cylinder body 22, positive stop 23, bumper 24, upper cylinder body 25, the second end cap on the basis of said structure 27, the lower end of piston 33 and piston rod 36 is coupled to be integrally mounted in piston cylinder 32, piston cylinder 32 lower end is fixed on base On 21, its upper end is provided with the 3rd end cap 35, and the through hole in the middle of the located sleeve 38 of piston rod 36 is protruding, on piston rod 36 End is fixed with support base 37, and abutment sleeve 38 is fixed in the through hole in the middle of the 3rd end cap 35, and the 3rd end cap 35 has pore 34 connection air.
The invention has the benefit that
Compared with prior art, control pressure-pad-force core institution by gas control valve core structure be substituted for precision higher and response The synchronous 1 motor-driven valve core structure 19 of the faster AC servo of speed, simple and compact for structure, fault rate is low.Valve core structure 19 Design has buffer capacity, can solve the problems, such as that punching press initial time pressure-pad-force is excessive, protect valve core structure 19 simultaneously Main valve plug 19-1 be not damaged by.Pressure sensor 26 is installed in upper cylinder body 25, you can easily according to instant pressure condition Adjusting AC servo synchronous motor 1, thus completing the precise control of main valve plug 19-1 displacement, and then realizing the accurate of pressure-pad-force Control, be monolithically fabricated a closed-loop system;AC servo synchronous motor 1 drives planetary lead-screw 8 to rotate through planetary reduction gear, Ran Houjing Cross the linear motion that planetary roller pair is converted into main valve plug 19-1, using AC servo synchronous motor 1 closed-loop control main valve plug 19- 1 displacement, can achieve that accurate pressure-pad-force is adjusted.
Brief description
Fig. 1 is the front view of hydraulic tensioning pad general structure of the present invention.
Fig. 2 is the side view of hydraulic tensioning pad general structure of the present invention.
Fig. 3 is the front view of hydraulic tensioning pad single structure of the present invention.
Fig. 4 is the enlarged diagram in a region in Fig. 3 of the present invention.
Fig. 5 is the schematic diagram of valve core structure 19 in Fig. 3 of the present invention.
Fig. 6 is a kind of schematic diagram of improved structure of hydraulic tensioning pad of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to the present invention.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of hydraulic tensioning of AC servo synchronous machine drives planetary roller screw Pad, including four AC servo synchronous motors 1 being arranged symmetrically two-by-two, AC servo synchronous motor 1 is through end flanges 3 and planet Speed reducer housing 7 is fixedly connected, and the output shaft of AC servo synchronous motor 1 is bonded with sun gear 2, the circumferential cloth of sun gear 2 It is equipped with three planetary gears 4, planetary gear 4 is arranged on pinion frame 6, and planetary gear 4 is engaged with ring gear 5, and ring gear 5 is by end face Flange 3 is fixed in planetary reduction gear shell 7, pinion frame 6 and the bonded guarantee synchronous axial system in planetary lead-screw 8 one end, OK Astral fiber thick stick 8 is arranged on the bearing block in planetary reduction gear shell 7 through thrust bearing 9, and the axial direction of thrust bearing 9 is fixed The first end cap 10 in planet speed reducer housing 7 constrains, and planetary lead-screw 8 is connected with planet nut 12 by planetary roller 11, Planetary roller 11 is arranged between first planet roller stand 13 and the second planetary roller frame 14, and the end face of planet nut 12 is fixed with Back-up ring 15, planet nut 12 upper end is fixedly connected with push rod 16 lower end and is simultaneously attached in the first sleeve 17, planet nut 12 Outer wall is embedded with anti-rotation flat key 39, and corresponding first sleeve 17 inwall is machined with keyway, push rod 16 upper end and valve core structure 19 shell 19-8 lower end is fixed, and the first sleeve 17 lower end is fixedly connected with planetary reduction gear shell 7, the first sleeve 17 upper end with Base 21 is fixedly connected, and the first sleeve 17 has external oil circuit interface 18 and connects hydraulic circuit, by external oil circuit interface 18 Realize the oil-feed of hydraulic tensioning pad and fuel-displaced, base 21 is arranged symmetrically in around lower mould 30 two-by-two, and lower mould 30 is fixing On workbench 29, valve seat 20 is fixed in the groove in the middle of base 21, has through hole, through hole upper end and lower cylinder body in the middle of valve seat 20 The inner chamber UNICOM of 22 inner chamber UNICOM, lower end and the first sleeve 17, and the shell 19-8 upper end cooperation with valve core structure 19, lower cylinder Body 22 lower end is fixed on base 21, and lower cylinder body 22 upper end is provided with bumper 24, and lower cylinder body 22 outer wall is cased with upper cylinder body 25, on The lower end of cylinder body 25 is fixed with positive stop 23, and constitutes spacing, the upper end peace of upper cylinder body 25 with the bossing of lower cylinder body 22 Equipped with the second end cap 27 and supporting pad 28, the second end cap 27 is fixedly connected with supporting pad 28, is provided with the second end cap 27 side wall Pressure sensor 26, in upper cylinder body 25 inner chamber that the inductive connector of pressure sensor 26 extend into, during work, lower cylinder body 22 and upper It is filled with hydraulic oil in the inner chamber of cylinder body 25.
As shown in figure 5, described valve core structure 19 includes main valve plug 19-1, main valve plug 19-1 lower end is with upper piston 19-3 even Connect, and be fixed by big nut 19-6, upper piston 19-3 and lower piston 19-9 by be separated into inside shell 19-8 epicoele 19-2, Lumen 19-5, cavity of resorption 19-7, equipped with ladder choke valve 19-4 and check valve 19-10 on upper piston 19-3, when under upper piston 19-3 During row, hydraulic oil flows back to epicoele 19-2 from lumen 19-5 through ladder choke valve 19-4, the hydraulic oil when upper piston 19-3 backhaul is up It is back to lumen 19-5 from epicoele 19-2 via check valve 19-10;Compressed air suits in cavity of resorption 19-7, lower piston 19-9 is descending When, compress cavity of resorption gas, complete to recover initial position, shell 19-8 by gas tension when lower piston 19-9 backhaul Upper end is fixed with flange 19-11, and shell 19-8 outer wall is cased with spring 19-12, and spring 19-12 upper end withstands on main valve plug 19-1, Lower end withstands on push rod 16.
The size of pressure-pad-force is determined by the openings of sizes between main valve plug 19-1 and valve seat 20, according to punching course to pressure-pad-force The requirement of curve, thus drawing the pressure curve of hydraulic oil in upper cylinder body 25, and then obtains the displacement curve of main valve plug 19-1, from And obtain the working curve of AC servo synchronous motor 1, immediately detect the pressure in upper cylinder body 25 via pressure sensor 26, lead to Cross the closed loop that pressure-pad-force in the displacement to main valve plug 19-1 and punching course is realized in the control to AC servo synchronous motor 1 Control.
As shown in fig. 6, removing lower cylinder body 22, positive stop 23, bumper 24, upper cylinder body on the basis of said structure 25th, the second end cap 27, the lower end of piston 33 and piston rod 36 is coupled to be integrally mounted in piston cylinder 32, piston cylinder 32 lower end It is fixed on base 21, its upper end is provided with the 3rd end cap 35, the through hole in the middle of the located sleeve 38 of piston rod 36 is protruding, Piston rod 36 upper end is fixed with support base 37, and abutment sleeve 38 is fixed in the through hole in the middle of the 3rd end cap 35, the 3rd end cap 35 On have pore 34 connect air.
The operation principle of the present invention is:
In the hydraulic tensioning pad Job readiness stage, AC servo synchronous motor 1 rotates forward, by sun gear 2, planetary gear 4 and row Gear rack 6 drives planetary lead-screw 8 to rotate, and planetary lead-screw 8 drives planetary roller 11 thereon to rotate, due to planet nut 12 Circumferential direction is limited by anti-rotation flat key 39, and planet nut 12 and planetary roller 11 will move down simultaneously, drives and planet nut The push rod 16 of 12 connections is descending, and then drive valve core structure 19 is descending, and the main valve plug 19-1 of valve core structure 19 is separated with valve seat 20, Valve is opened, and hydraulic oil is entered by external oil circuit interface 18, through the through hole in the middle of valve seat 20 to oil-filled in lower cylinder body 22, this When, upper cylinder body 25 is up, until positive stop 23 reaches restraining position, then AC servo synchronous motor 1 inverts, and valve element is tied The main valve plug 19-1 of structure 19 is pushed in valve seat 20, now, is filled with hydraulic oil, hydraulic tensioning in upper cylinder body 25 and lower cylinder body 22 Pad is in holding state, then sheet material to be punched is placed on supporting pad 14, completes the Job readiness stage of hydraulic tensioning pad.
Hydraulic tensioning pad working stage, when the web contact that mold 31 is descending and is placed on supporting pad 14, instantaneous product Raw high pressure makes the hydraulic oil pressure in upper cylinder body 25 and lower cylinder body 22 raise, under the main valve plug 19-1 of valve core structure 19 is forced OK, drive that upper piston 19-3 in valve core structure 19 and lower piston 19-9 is descending, hydraulic oil is therefrom when upper piston 19-3 is descending Chamber 19-5 flows back to epicoele 19-2 through ladder choke valve 19-4, and to slowing down, main valve plug 19-1 is descending to play a role.Cavity of resorption 19-7 Interior compressed air suits, when lower piston 19-9 is descending, compresses cavity of resorption gas, and to slowing down, main valve plug 19-1 is descending to be played necessarily Effect.Additionally, spring 19-12 is to slowing down, and main valve plug 19-1 is descending to also function to certain effect.Three works in coordination with the work serving buffering With, it is to avoid main valve plug 19-1 is because being produced damage by larger instantaneous impact.Meanwhile, because oil pressure liter in chamber Height, the oil pressure that pressure sensor 26 detects in upper cylinder body 25 raises, and fuel injection pressure signal is fed back in processor and exchange is watched Take synchronous motor 1 and send signal, AC servo synchronous motor 1 rotates forward so that main valve plug 19-1 is descending, main valve plug 19-1 and valve seat Separate between 20, the hydraulic oil in upper cylinder body 25 flow back in fuel tank via external oil circuit interface 18, now upper cylinder body 25 with Mold 31 is descending, completes punching course.Then mold 31 is up returns to initial position, and main valve plug 19-1 is together with upper piston 19-3 and lower piston 19-9 returns to initial position under the restoring force of spring 19-12, prepares for punching press next time.

Claims (4)

1. a kind of hydraulic tensioning pad of AC servo synchronous machine drives planetary roller screw, including four be arranged symmetrically two-by-two AC servo synchronous motor (1) it is characterised in that: the output shaft of AC servo synchronous motor (1) pass through planetary reduction gear and row Astral fiber thick stick (8) one end connects, and planetary lead-screw (8) is connected with planet nut (12), and planet nut (12) is solid with push rod (16) lower end Surely connect and be simultaneously attached in the first sleeve (17), push rod (16) upper end is solid with shell (19-8) lower end of valve core structure (19) Fixed, the first sleeve (17) lower end is fixedly connected with planetary reduction gear shell (7), and the first sleeve (17) upper end is fixing with base (21) Connect, the first sleeve (17) has external oil circuit interface (18) and connects hydraulic circuit, base (21) is arranged symmetrically in down two-by-two Around mould (30), and it is fixed on workbench (29), valve seat (20) is fixed in the groove in the middle of base (21), valve seat (20) have through hole in the middle of, through hole upper end is connected with the inner chamber of lower cylinder body (22), and lower end is connected with the inner chamber of the first sleeve (17), And coordinate with shell (19-8) upper end of valve core structure (19), lower cylinder body (22) lower end is fixed on base (21), lower cylinder body (22) upper end is provided with bumper (24), and lower cylinder body (22) outer wall is cased with upper cylinder body (25), and the lower end of upper cylinder body (25) is fixed with Positive stop (23), the upper end of upper cylinder body (25) is provided with the second end cap (27) and supporting pad (28), the second end cap (27) side wall Pressure sensor (26) is inside installed, the inductive connector of pressure sensor (26) extend in upper cylinder body (25) inner chamber, during work, It is filled with hydraulic oil in the inner chamber of lower cylinder body (22) and upper cylinder body (25).
2. the hydraulic tensioning pad of a kind of AC servo synchronous machine drives planetary roller screw according to claim 1, its It is characterised by: described valve core structure (19) includes main valve plug (19-1), main valve plug (19-1) lower end is connected with upper piston (19-3), And be fixed by big nut (19-6), upper piston (19-3) and lower piston (19-9) are separated into epicoele by inside shell (19-8) (19-2), lumen (19-5), cavity of resorption (19-7), equipped with ladder choke valve (19-4) and check valve (19- on upper piston (19-3) 10), when upper piston (19-3) is descending, hydraulic oil flows back to epicoele (19-2) from lumen (19-5) through ladder choke valve (19-4), when When upper piston (19-3) backhaul is up, hydraulic oil is back to lumen (19-5) from epicoele (19-2) via check valve (19-10);Under The interior compressed air suits in chamber (19-7), when lower piston (19-9) is descending, compresses cavity of resorption gas, lower piston (19-9) backhaul When complete to recover initial position by gas tension, shell (19-8) upper end is fixed with flange (19-11), and shell (19-8) is outward Wall is cased with spring (19-12), and spring (19-12) upper end withstands on main valve plug (19-1), and lower end withstands on push rod (16).
3. the hydraulic tensioning pad of a kind of AC servo synchronous machine drives planetary roller screw according to claim 2, its It is characterised by: the size of pressure-pad-force is determined by the openings of sizes between main valve plug (19-1) and valve seat (20), according to punching course pair The requirement of flanging force curve, thus drawing the pressure curve of the interior hydraulic oil of upper cylinder body (25), and then obtains main valve plug (19-1) Displacement curve, thus obtaining the working curve of AC servo synchronous motor (1), detects upper cylinder half immediately via pressure sensor (26) Pressure in body (25), by the control of AC servo synchronous motor (1) is realized the displacement to main valve plug (19-1) and The closed-loop control of pressure-pad-force in punching course.
4. the hydraulic tensioning pad of a kind of AC servo synchronous machine drives planetary roller screw according to claim 1, its Be characterised by: remove on the basis of said structure lower cylinder body (22), positive stop (23), bumper (24), upper cylinder body (25), Second end cap (27), the lower end of piston (33) and piston rod (36) is coupled to be integrally mounted in piston cylinder (32), piston cylinder (32) lower end is fixed on base (21), and its upper end is provided with the 3rd end cap (35), in the located sleeve of piston rod (36) (38) Between through hole protruding, piston rod (36) upper end is fixed with support base (37), and abutment sleeve (38) is fixed on the 3rd end cap (35), in the through hole in the middle of, the 3rd end cap (35) has pore (34) and connects air.
CN201510548911.2A 2015-08-31 2015-08-31 Hydraulic extension cushion with planetary roller screw driven by alternating-current servo synchronous motor Expired - Fee Related CN105057432B (en)

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CN201510548911.2A CN105057432B (en) 2015-08-31 2015-08-31 Hydraulic extension cushion with planetary roller screw driven by alternating-current servo synchronous motor

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CN201510548911.2A CN105057432B (en) 2015-08-31 2015-08-31 Hydraulic extension cushion with planetary roller screw driven by alternating-current servo synchronous motor

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017117595A1 (en) * 2017-08-03 2019-02-07 Voith Patent Gmbh METHOD FOR CONTROLLING THE OUTPUT PRESSURE OF A HYDRAULIC DRIVE SYSTEM, USE OF THE METHOD AND HYDRAULIC DRIVE SYSTEM
CN108869677B (en) * 2018-08-15 2020-04-21 北京中航惠通自动化技术有限公司 Electric push rod with built-in planetary ball screw

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CN103586321A (en) * 2013-10-16 2014-02-19 西安交通大学 Supercharged electric servo deep-drawing cushion

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EP1882534A1 (en) * 2005-05-16 2008-01-30 Aida Engineering, Ltd. Die cushion device for press machine
EP2104578B1 (en) * 2006-11-30 2010-04-28 Müller Weingarten AG Die cushion device comprising a modular hybrid drive unit
CN102632124A (en) * 2012-04-11 2012-08-15 济南二机床集团有限公司 Electro-servo stretching pad
CN103586321A (en) * 2013-10-16 2014-02-19 西安交通大学 Supercharged electric servo deep-drawing cushion

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