CN103148046A - Alternating current servo direct-drive supercharged three-layer piston electrohydraulic cylinder and supercharging method - Google Patents

Alternating current servo direct-drive supercharged three-layer piston electrohydraulic cylinder and supercharging method Download PDF

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Publication number
CN103148046A
CN103148046A CN2013100806244A CN201310080624A CN103148046A CN 103148046 A CN103148046 A CN 103148046A CN 2013100806244 A CN2013100806244 A CN 2013100806244A CN 201310080624 A CN201310080624 A CN 201310080624A CN 103148046 A CN103148046 A CN 103148046A
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chamber
piston
layer
hydraulic
oil
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CN103148046B (en
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赵升吨
范淑琴
李靖祥
赵永强
徐凡
陈超
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention relates to an alternating current servo direct-drive supercharged three-layer piston electrohydraulic cylinder and a supercharging method. The hydraulic cylinder is not provided with a pump station, an oil tank, a complicated hydraulic pipeline and a hydraulic valve in the traditional hydraulic cylinder, is simple and compact in structure and low in failure rate; a displacement sensor is mounted at an output end of a piston rod, and a high-pressure oil chamber is internally provided with a pressure sensor, so that an alternating current servo motor can be controlled to realize closed-loop control of displacement and an output force; the alternating current servo motor directly drives a screw rod to drive pistons to make linear motion; the three layers of pistons are adopted to achieve a supercharging effect; hydraulic oil circulates in a hydraulic cylinder body; when the hydraulic cylinder operates, a working chamber can quickly response to charge and discharge liquid; and a structural form of the hydraulic cylinder can be changed according to different operating requirement.

Description

Three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo and boosting method
Technical field
The invention belongs to oil hydraulic cylinder manufacturing technology field, be specifically related to three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo and boosting method.
Background technique
Traditional oil hydraulic cylinder needs hydraulic power unit, fuel tank, several hydrovalves, hydraulic pipe line and automatical control system etc., complex structure, and floor space is large, and rate of fault is high; Electric cylinder be with electronic and with the modular product of leading screw integrated design, simple in structure, ouput force is little, does not also possess function of increasing pressure, the closed loop control that realize stipulating ouput force often needs to add loading formula pressure transducer.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the invention provides three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo and boosting method thereof, simple in structure, failure rate is low, if at piston rod output terminal installation position displacement sensor, and in high-voltage oil cavity the setting pressure sensor, can realize easily the closed loop control of displacement, ouput force by the control to AC servo motor; Alternating current servo motor direct drives leading screw and drives the piston linear motion, adopts three layers of pistons acquisition pressurized effect, and hydraulic oil circulates in hydraulic cylinder inside, has saved fuel tank, and active chamber is topping up and discharge opeing rapidly.
In order to achieve the above object, the technical solution used in the present invention is:
three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo, comprise the motor reducer 2 that connects on alternating current servomotor 1 and machine shaft, connect a small pulley 3 on the output shaft of motor reducer 2, small pulley 3 connects a large belt wheel 5 by toothed belt 4, large belt wheel 5 is coupled as one with ball screw 7 by two large round nuts 6, large belt wheel 5 drives ball screw 7 and rotates together, ball-screw nut 10 is housed on ball screw 7, ball-screw nut 10 is coupled as one with first layer piston 11 radial fit, the upper cover of piston rod of first layer piston 11 spring 12, the top and bottom of spring 12 respectively with first layer piston 11 and for the second time piston 13 contact, the piston rod radial fit of second layer piston 13 and first layer piston 11, communicate with atmosphere with cavity between second layer piston 13 at first layer piston 11, space between the upper-end surface of first layer piston 11 and cylinder body 18 is A chamber 9, formation B chamber 16 between the piston rod of first layer piston 11 and ball screw 7, be processed with small piston chamber 19 on the cylinder body 18 of second layer piston 13 belows, the cylinder body at 19 places, small piston chamber, the piston rod of first layer piston 11, formation C chamber 17 between second layer piston 13, there is the 3rd layer of piston 21 19 belows, small piston chamber, the piston rod of the 3rd layer of piston 21 can pass the cylinder bottom 30 with cylinder body 18 fixed connections, the external application of force when hydraulic cylinder works, the area of the 3rd layer of piston 21 is greater than the piston rod area of first layer piston 11, it is D chamber 20 between the 3rd layer of piston 21 and small piston chamber 19 place cylinder bodies, small piston chamber 19 has been communicated with C chamber 17 and D chamber 20, space between the 3rd layer of piston 21 and cylinder bottom 30 is E chamber 22, A chamber 9 during hydraulic cylinder works, B chamber 16, C chamber 17, D chamber 20, E chamber 22 and the small piston chamber 19 interior hydraulic oil that all have been full of,
Be connected with hydraulic pipe line 23 between E chamber 22 and A chamber 9, in the quick descending and pressurization stages at a slow speed of hydraulic cylinder piston, hydraulic oil in E chamber 22 is discharged to A chamber 9 and B chamber 16 by hydraulic pipe line 23, in the hydraulic cylinder piston backhaul stage, the hydraulic oil in A chamber 9 and B chamber 16 flow into 22 li, E chamber by hydraulic pipe line 23;
Back pressure valve 14 and one-way valve 15 are housed above cylinder body 18, the two ends of back pressure valve 14 connect respectively A chamber 9 and C chamber 17, in the quick descending stage of hydraulic cylinder piston, when A chamber 9 interior oil pressure when not enough, back pressure valve 14 is opened, and the hydraulic oil in C chamber 17 replenishes hydraulic oil in the elastic force effect of spring 12 to A chamber 9; In oil hydraulic cylinder pressurization stages at a slow speed, the stifled small piston of the piston rod of first layer piston 11 chamber 19, when first layer piston 11 was descending, back pressure valve 14 was opened, and the hydraulic oil in C chamber 17 flows into A chamber 9 and B chamber 16 by back pressure valve 14; The two ends of one-way valve 15 connect respectively A chamber 9 and C chamber 17, and in the hydraulic cylinder piston backhaul stage, one-way valve 15 is opened, C chamber 17 oil suction from A chamber 9.
Remove small pulley 3, toothed belt 4, large belt wheel 5 on the basis of said structure, the output shaft of motor reducer 2 connects by coupling 27 and ball screw 7, and during work, AC servo motor 1 directly drives ball screw 7 rotations by motor reducer 2, coupling 27.
In order to improve the bearing capacity of oil hydraulic cylinder, ball screw 7 and ball-screw nut 9 to be replaced with planetary roller screw 24, planetary roller screw nut 25 respectively, planetary roller screw nut 25 is by roller 26 and planetary roller screw 24 radial fit.
At the output terminal installation position of the piston rod of the 3rd layer of piston 21 displacement sensor, and at high-voltage oil cavity D chamber 20 interior setting pressure sensors, can realize easily the closed loop control of displacement, ouput force by the control to AC servo motor 1.
the boosting method of three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo, the quick descending stage of hydraulic cylinder piston, alternating current servomotor 1 forward, by small pulley 3, toothed belt 4 and large belt wheel 5 drive ball screw 7 rotations, the ball-screw nut 9 that ball screw 7 drives on it is descending, and then promotion first layer piston 11, spring 12, second layer piston 13 is descending, promote hydraulic oil in C chamber 17 and flow to D chamber 20, thereby it is descending fast with the speed identical with second layer piston 13 with first layer piston 11 to promote the 3rd layer of piston 21, at this moment, hydraulic oil in E chamber 22 flows into A chamber 9 and B chamber 16 by hydraulic pipe line 23, if A this moment chamber 9 interior oil pressure are still not enough, back pressure valve 14 is opened, hydraulic oil in C chamber 17 flow into A chamber 9 parts under the elastic force effect of spring 12, and the hydraulic oil of C chamber 17 interior remainders continues to promote the 3rd layer of piston 21 and moves downward, oil hydraulic cylinder is pressurization stages at a slow speed, this moment, first layer piston 11 piston rod just entered small piston chamber 19, blocked the path between C chamber 17 and D chamber 20, hydraulic oil between C chamber 17 and D chamber 20 circulates no longer mutually, when first layer piston 11 continues when descending, the hydraulic oil in C chamber 17 flows back in A chamber 9 and B chamber 16 by back pressure valve 14, hydraulic oil in small piston chamber 19 flows into D chamber 20, due to the area of the 3rd layer of piston 21 piston rod area greater than first layer piston 11, has very large pressure ratio, thereby D chamber 20 is high-voltage oil cavity, thereby realized reinforcement, the hydraulic oil in E chamber 22 also flows in A chamber 9 and B chamber 16 by hydraulic pipe line 23, and the piston rod of first layer piston 11 comes downwards to when filling up small piston chamber 19, and the 3rd layer of piston 21 arrives cylinder bottom and reach range, and hydraulic cylinder works finishes, the up backhaul stage of hydraulic cylinder piston, alternating current servomotor 1 counter-rotating, ball screw 7 rotates and makes ball-screw nut 9 up, ball-screw nut 9 drives first layer piston 11, second layer piston 13 is up, the volume in A chamber 9 and B chamber 16 reduces, hydraulic oil wherein flows into E chamber 22 by hydraulic pipe line 23, begin up until in leaving the stroke in small piston chamber 19 at the piston rod of first layer piston 11, one-way valve 15 is opened, hydraulic oil in A chamber 9 flows into C chamber 17 by one-way valve 15, when the piston rod of first layer piston 11 leaves small piston chamber 19 fully, C chamber 17 and D chamber 20 connections, the hydraulic oil in D chamber 20 flows into C chamber 17, the C cavity pressure increases, one-way valve 15 is closed, A chamber 9 replenishes hydraulic oil no longer for C chamber 17, continuing when up E chamber 22 continues from A chamber 9 oil suctions, it is up that the hydraulic oil in E chamber continues to promote the 3rd layer of piston 21, until it resets.
The present invention compared with prior art, save pumping plant in conventional cylinder, fuel tank, numerous and diverse hydraulic pipe line and hydrovalve, simple and compact for structure, failure rate is low, at piston rod output terminal installation position displacement sensor, and in high-voltage oil cavity the setting pressure sensor, can realize easily the closed loop control of displacement, ouput force by the control to AC servo motor; Alternating current servo motor direct drives leading screw and drives the piston linear motion, adopt three layers of piston to obtain pressurized effect, hydraulic oil circulates in hydraulic cylinder inside, can react rapidly topping up and discharge opeing when hydraulic cylinder works, and can its mode of structure of conversion according to different usage requirements.
Description of drawings
Fig. 1 is hydraulic cylinder structure schematic diagram of the present invention.
Fig. 2 is oil hydraulic cylinder the first improved structure schematic diagram of the present invention.
Fig. 3 is oil hydraulic cylinder the second improved structure schematic diagram of the present invention.
Fig. 4 is the third improved structure schematic diagram of oil hydraulic cylinder of the present invention.
Fig. 5 is oil hydraulic cylinder supercharging schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
as shown in Figure 1, three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo, comprise the motor reducer 2 that connects on alternating current servomotor 1 and machine shaft, connect a small pulley 3 on the output shaft of motor reducer 2, motor reducer 2 is fixedly connected with fuselage 28, small pulley 3 connects a large belt wheel 5 by toothed belt 4, large belt wheel 5 is coupled as one with ball screw 7 by two large round nuts 6, ball screw 7 is connected with bearing 8 radial fit, bearing 8 connects by screw with cylinder cap 29, the fuselage 28 of cylinder cap 29 and its top with and cylinder body 18 fixed connections of below, large belt wheel 5 drives ball screw 7 and rotates together, ball-screw nut 10 is housed on ball screw 7, ball-screw nut 10 is coupled as one with first layer piston 11 radial fit, the upper cover of piston rod of first layer piston 11 spring 12, the top and bottom of spring 12 respectively with first layer piston 11 and for the second time piston 13 contact, the piston rod radial fit of second layer piston 13 and first layer piston 11, communicate with atmosphere with cavity between second layer piston 13 at first layer piston 11, space between the upper-end surface of first layer piston 11 and cylinder body 18 is A chamber 9, formation B chamber 16 between the piston rod of first layer piston 11 and ball screw 7, be processed with small piston chamber 19 on the cylinder body 18 of second layer piston 13 belows, the cylinder body at 19 places, small piston chamber, the piston rod of first layer piston 11, formation C chamber 17 between second layer piston 13, there is the 3rd layer of piston 21 19 belows, small piston chamber, the piston rod of the 3rd layer of piston 21 can pass the cylinder bottom 30 with cylinder body 18 fixed connections, the external application of force when hydraulic cylinder works, the area of the 3rd layer of piston 21 is greater than the piston rod area of first layer piston 11, it is D chamber 20 between the 3rd layer of piston 21 and small piston chamber 19 place cylinder bodies, small piston chamber 19 has been communicated with C chamber 17 and D chamber 20, space between the 3rd layer of piston 21 and cylinder bottom 30 bottom surfaces is E chamber 22, A chamber 9 during hydraulic cylinder works, B chamber 16, C chamber 17, D chamber 20, E chamber 22 and the small piston chamber 19 interior hydraulic oil that all have been full of,
Be connected with hydraulic pipe line 23 between E chamber 22 and A chamber 9, in the quick descending and pressurization stages at a slow speed of hydraulic cylinder piston, hydraulic oil in E chamber 22 is discharged to A chamber 9 and B chamber 16 by hydraulic pipe line 23, in the hydraulic cylinder piston backhaul stage, the hydraulic oil in A chamber 9 and B chamber 16 flow into 22 li, E chamber by hydraulic pipe line 23;
Back pressure valve 14 and one-way valve 15 are housed above cylinder body 18, the two ends of back pressure valve 14 connect respectively A chamber 9 and C chamber 17, in the quick descending stage of hydraulic cylinder piston, when A chamber 9 interior oil pressure when not enough, back pressure valve 14 is opened, and the hydraulic oil in C chamber 17 replenishes hydraulic oil in the elastic force effect of spring 12 to A chamber 9; In oil hydraulic cylinder pressurization stages at a slow speed, the stifled small piston of the piston rod of first layer piston 11 chamber 19, when first layer piston 11 was descending, back pressure valve 14 was opened, and the hydraulic oil in C chamber 17 flows into A chamber 9 and B chamber 16 by back pressure valve 14; The two ends of one-way valve 15 connect respectively A chamber 9 and C chamber 17, and in the hydraulic cylinder piston backhaul stage, one-way valve 15 is opened, C chamber 17 oil suction from A chamber 9.
As shown in Figure 2, remove small pulley 3, toothed belt 4, large belt wheel 5 on the basis of said structure, the output shaft of motor reducer 2 connects by coupling 27 and ball screw 7, and during work, AC servo motor 1 directly drives ball screw 7 rotations by motor reducer 2, coupling 27.
As shown in Figure 3 and Figure 4, in order to improve the bearing capacity of oil hydraulic cylinder, ball screw 7 and ball-screw nut 9 are replaced with planetary roller screw 24, planetary roller screw nut 25 respectively, and planetary roller screw nut 25 is by roller 26 and planetary roller screw 24 radial fit.
At the output terminal installation position of the piston rod of the 3rd layer of piston 21 displacement sensor, and at high-voltage oil cavity D chamber 20 interior setting pressure sensors, can realize easily the closed loop control of displacement, ouput force by the control to AC servo motor 1.
as shown in Figure 5, the boosting method of three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of a kind of AC servo, wherein Fig. 5-1 is the original state of oil hydraulic cylinder, prepare the beginning quick descending stage of hydraulic cylinder piston, alternating current servomotor 1 forward, by small pulley 3, toothed belt 4 and large belt wheel 5 drive ball screw 7 rotations, the ball-screw nut 9 that ball screw 7 drives on it is descending, and then promotion first layer piston 11, spring 12, second layer piston 13 is descending, promote hydraulic oil in C chamber 17 and flow to D chamber 20, thereby it is descending fast with the speed identical with second layer piston 13 with first layer piston 11 to promote the 3rd layer of piston 21, at this moment, hydraulic oil in E chamber 22 flows into A chamber 9 and B chamber 16 by hydraulic pipe line 23, if A this moment chamber 9 interior oil pressure are still not enough, back pressure valve 14 is opened, hydraulic oil in C chamber 17 flow into A chamber 9 parts under the elastic force effect of spring 12, and the hydraulic oil of C chamber 17 interior remainders continues to promote the 3rd layer of piston 21 and moves downward.The piston rod that is depicted as first layer piston 11 as Fig. 5-2 has just entered small piston chamber 19, begin oil hydraulic cylinder pressurization stages at a slow speed this moment, the piston rod of first layer piston 11 has been blocked the path between C chamber 17 and D chamber 20, and the hydraulic oil between C chamber 17 and D chamber 20 circulates no longer mutually.when first layer piston 11 continues when descending, the hydraulic oil in C chamber 17 flows back in A chamber 9 and B chamber 16 by back pressure valve 14, hydraulic oil in small piston chamber 19 flows into D chamber 20, due to the area of the 3rd layer of piston 21 piston rod area greater than first layer piston 11, has very large pressure ratio, thereby D chamber 20 is high-voltage oil cavity, thereby realized reinforcement, the hydraulic oil in E chamber 22 also flows in A chamber 9 and B chamber 16 by hydraulic pipe line 23, Fig. 5-3 for oil hydraulic cylinder at a slow speed the piston rod of pressurization stages first layer piston 11 enter into the state of small piston chamber 19 1 segment distances, the piston rod of first layer piston 11 continues to come downwards to when filling up small piston chamber 19 afterwards, the 3rd layer of piston 21 arrives cylinder bottom and reaches range, Fig. 5-4 come downwards to state when filling up small piston chamber 19 for the piston rod of first layer piston 11, this moment, hydraulic cylinder works finished, the beginning up backhaul stage of hydraulic cylinder piston, alternating current servomotor 1 counter-rotating, ball screw 7 rotates and makes ball-screw nut 9 up, ball-screw nut 9 drives first layer piston 11, second layer piston 13 is up, the volume in A chamber 9 and B chamber 16 reduces, hydraulic oil wherein flows into E chamber 22 by hydraulic pipe line 23, begin up until in leaving the stroke in small piston chamber 19 at the piston rod of first layer piston 11, one-way valve 15 is opened, hydraulic oil in A chamber 9 flows into C chamber 17 by one-way valve 15.When the piston rod of first layer piston 11 leaves small piston chamber 19 fully, C chamber 17 and D chamber 20 connections, the hydraulic oil in D chamber 20 flows into C chamber 17, the C cavity pressure increases, one-way valve 15 is closed, and A chamber 9 replenishes hydraulic oil no longer for C chamber 17, continues when up E chamber 22 continuation from A chamber 9 oil suctions, it is up that the hydraulic oil in E chamber continues to promote the 3rd layer of piston 21, until it resets.State when when Fig. 5-5 are depicted as the hydraulic cylinder piston backhaul, the piston rod of first layer piston 11 has just left small piston chamber 19, the state after when Fig. 5-6 are depicted as the oil hydraulic cylinder backhaul, first layer piston 11 has resetted.
Working principle of the present invention is:
under the oil hydraulic cylinder original state, alternating current servomotor 1 forward, drive ball screw 7 or planetary roller screw 24 rotations, ball-screw nut 9 or planetary roller screw nut 25 are descending, and then promotion first layer piston 11, spring 12, second layer piston 13 is descending, promote hydraulic oil in C chamber 17 and flow to D chamber 20, thereby it is descending fast with the speed identical with second layer piston 13 with first layer piston 11 to promote the 3rd layer of piston 21, at this moment, hydraulic oil in E chamber 22 flows into A chamber 9 and B chamber 16 by hydraulic pipe line 23, if A this moment chamber 9 interior oil pressure are still not enough, back pressure valve 14 is opened, hydraulic oil in C chamber 17 flow into A chamber 12 parts under the elastic force effect of spring 12, and the hydraulic oil of C chamber 17 interior remainders continues to promote the 3rd layer of piston 21 and moves downward.Just begun pressurization stages at a slow speed when just entering small piston chamber 19 when the piston rod of first layer piston 11 comes downwards to, the hydraulic oil between stifled C this moment chamber 17 and D chamber 20 circulates no longer mutually.First stage piston first layer piston 11 continues when descending, the hydraulic oil in C chamber 17 flows back in A chamber 9 and B chamber 16 by back pressure valve 14, hydraulic oil in small piston chamber 19 flows into D chamber 20, due to the area of the 3rd layer of piston 21 piston rod area greater than first layer piston 11, have very large pressure ratio, thereby realized reinforcement; The hydraulic oil in E chamber 22 also flows in A chamber 9 and B chamber 16 by hydraulic pipe line 23, and the piston rod of first layer piston 11 comes downwards to when filling up small piston chamber 19, and the 3rd layer of piston 21 arrives cylinder bottom and reach range, and hydraulic cylinder works finishes.Then hydraulic cylinder piston begins the up stage of backhaul, alternating current servomotor 1 counter-rotating, ball screw 7 rotates and makes ball-screw nut 9 up, ball-screw nut 9 drives first layer piston 11, second layer piston 13 is up, the volume in A chamber 9 and B chamber 16 reduces, and hydraulic oil wherein flows into E chamber 22 by hydraulic pipe line 23, begins up until in leaving the stroke in small piston chamber 19 at the piston rod of first layer piston 11, one-way valve 15 is opened, and the hydraulic oil in A chamber 9 flows into C chamber 17 by one-way valve 15.When the piston rod of first layer piston 11 leaves small piston chamber 19 fully, C chamber 17 and D chamber 20 connections, the hydraulic oil in D chamber 20 flows into C chamber 17, the C cavity pressure increases, one-way valve 15 is closed, and A chamber 9 replenishes hydraulic oil no longer for C chamber 17, continues when up E chamber 22 continuation from A chamber 9 oil suctions, it is up that the hydraulic oil in E chamber continues to promote the 3rd layer of piston 21, until it resets.
In accompanying drawing: 1, alternating current servomotor; 2, motor reducer; 3, small pulley; 4, toothed belt; 5, large belt wheel; 6, large round nut; 7, ball screw; 8, bearing; 9, A chamber; 10, ball-screw nut; 11, first layer piston; 12, spring; 13, second layer piston; 14, back pressure valve; 15, one-way valve; 16, B chamber; 17, C chamber; 18, cylinder body; 19, small piston chamber; 20, D chamber; 21 the 3rd layers of piston; 22, E chamber; 23, hydraulic pipe line; 24, planetary roller screw; 25, planetary roller screw nut; 26, roller; 27, coupling; 28, fuselage; 29, cylinder cap; 30, cylinder bottom.

Claims (5)

1. three layers of piston electric hydaulic cylinder of the direct-drive supercharged formula of AC servo, it is characterized in that: comprise the motor reducer (2) that connects on alternating current servomotor (1) and machine shaft, connect a small pulley (3) on the output shaft of motor reducer (2), small pulley (3) connects a large belt wheel (5) by toothed belt (4), large belt wheel (5) is coupled as one by two large round nuts (6) and ball screw (7), large belt wheel (5) drives ball screw (7) and rotates together, ball-screw nut (10) is housed on ball screw (7), ball-screw nut (10) is coupled as one with first layer piston (11) radial fit, the upper cover of piston rod of first layer piston (11) spring (12), the top and bottom of spring (12) respectively with first layer piston (11) and for the second time piston (13) contact, the piston rod radial fit of second layer piston (13) and first layer piston (11), communicate with atmosphere with cavity between second layer piston (13) at first layer piston (11), space between the upper-end surface of first layer piston (11) and cylinder body (18) is A chamber (9), consist of B chamber (16) between the piston rod of first layer piston (11) and ball screw (7), be processed with small piston chamber (19) on the cylinder body (18) of second layer piston (13) below, the cylinder body at place, small piston chamber (19), the piston rod of first layer piston (11), consist of C chamber (17) between second layer piston (13), there is the 3rd layer of piston (21) below, small piston chamber (19), the piston rod of the 3rd layer of piston (21) can pass the cylinder bottom (30) with cylinder body (18) fixed connection, the external application of force when hydraulic cylinder works, the area of the 3rd layer of piston (21) is greater than the piston rod area of first layer piston (11), be D chamber (20) between the 3rd layer of piston (21) and place, small piston chamber (19) cylinder body, small piston chamber (19) has been communicated with C chamber (17) and D chamber (20), space between the 3rd layer of piston (21) and cylinder bottom (30) is E chamber (22), during hydraulic cylinder works A chamber (9), B chamber (16), C chamber (17), D chamber (20), all be full of hydraulic oil in E chamber (22) and small piston chamber (19),
Be connected with hydraulic pipe line (23) between E chamber (22) and A chamber (9), in the quick descending and pressurization stages at a slow speed of hydraulic cylinder piston, hydraulic oil in E chamber (22) is discharged to A chamber (9) and B chamber (16) by hydraulic pipe line (23), in the hydraulic cylinder piston backhaul stage, it is inner that the hydraulic oil in A chamber (9) and B chamber (16) flows into E chamber (22) by hydraulic pipe line (23);
Back pressure valve (14) and one-way valve (15) are housed in the top of cylinder body (18), the two ends of back pressure valve (14) connect respectively A chamber (9) and C chamber (17), in the quick descending stage of hydraulic cylinder piston, when oil pressure in A chamber (9) is not enough, back pressure valve (14) is opened, and the hydraulic oil in C chamber (17) replenishes hydraulic oil in the elastic force effect of spring (12) to A chamber (9); In oil hydraulic cylinder pressurization stages at a slow speed, the piston rod of first layer piston (11) blocks up small piston chamber (19), when first layer piston (11) was descending, back pressure valve (14) was opened, and the hydraulic oil in C chamber (17) flows into A chamber (9) and B chamber (16) by back pressure valve (14); The two ends of one-way valve (15) connect respectively A chamber (9) and C chamber (17), and in the hydraulic cylinder piston backhaul stage, one-way valve (15) is opened, C chamber (17) oil suction from A chamber (9).
2. oil hydraulic cylinder according to claim 1, it is characterized in that: remove small pulley (3), toothed belt (4), large belt wheel (5) on the basis of said structure, the output shaft of motor reducer (2) connects by coupling (27) and ball screw (7), and AC servo motor during work (1) directly drives ball screw (7) by motor reducer (2), coupling (27) and rotates.
3. according to claim 1 with 2 described oil hydraulic cylinders, it is characterized in that: in order to improve the bearing capacity of oil hydraulic cylinder, use respectively planetary roller screw (24), planetary roller screw nut (25) to replace ball screw (7) and ball-screw nut (9), planetary roller screw nut (25) is by roller (26) and planetary roller screw (24) radial fit.
4. oil hydraulic cylinder according to claim 1, it is characterized in that: at the output terminal installation position of the piston rod of the 3rd layer of piston (21) displacement sensor, and in high-voltage oil cavity D chamber (20) the setting pressure sensor, can realize easily the closed loop control of displacement, ouput force by the control to AC servo motor 1.
5. the boosting method of oil hydraulic cylinder according to claim 1, it is characterized in that, the quick descending stage of hydraulic cylinder piston, alternating current servomotor (1) forward, by small pulley (3), toothed belt (4) and large belt wheel (5) drive ball screw (7) rotation, the ball-screw nut (9) that ball screw (7) drives on it is descending, and then promotion first layer piston (11), spring (12), second layer piston (13) is descending, the hydraulic oil that promotes in C chamber (17) flows to D chamber (20), thereby it is descending fast with the speed identical with second layer piston (13) with first layer piston (11) to promote the 3rd layer of piston (21), at this moment, hydraulic oil in E chamber (22) flows into A chamber (9) and B chamber (16) by hydraulic pipe line (23), if the interior oil pressure in A chamber (9) this moment is still not enough, back pressure valve (14) is opened, hydraulic oil in C chamber (17) flows into A chamber (a 9) part under the elastic force effect of spring (12), and the hydraulic oil of the interior remainder in C chamber (17) continuation the 3rd layer of piston of promotion (21) moves downward, oil hydraulic cylinder is pressurization stages at a slow speed, the piston rod of first layer piston this moment (11) has just entered small piston chamber (19), blocked the path between C chamber (17) and D chamber (20), hydraulic oil between C chamber (17) and D chamber (20) circulates no longer mutually, when first layer piston (11) continues when descending, the hydraulic oil in C chamber (17) flows back in A chamber (9) and B chamber (16) by back pressure valve (14), hydraulic oil in small piston chamber (19) flows into D chamber (20), due to the area of the 3rd layer of piston (21) the piston rod area greater than first layer piston (11), has very large pressure ratio, thereby D chamber (20) is high-voltage oil cavity, thereby realized reinforcement, the hydraulic oil in E chamber (22) also flows in A chamber (9) and B chamber (16) by hydraulic pipe line (23), the piston rod of first layer piston (11) comes downwards to when filling up small piston chamber (19), the 3rd layer of piston (21) arrives cylinder bottom and reaches range, and hydraulic cylinder works finishes, the up backhaul stage of hydraulic cylinder piston, alternating current servomotor (1) counter-rotating, ball screw (7) rotates and makes ball-screw nut (9) up, ball-screw nut (9) drives first layer piston (11), second layer piston (13) is up, the volume in A chamber (9) and B chamber (16) reduces, hydraulic oil wherein flows into E chamber (22) by hydraulic pipe line (23), piston rod at first layer piston (11) begins up until in leaving the stroke in small piston chamber (19), one-way valve (15) is opened, hydraulic oil in A chamber (9) flows into C chamber (17) by one-way valve (15), when the piston rod of first layer piston (11) leaves small piston chamber (19) fully, C chamber (17) and D chamber (20) are communicated with, the hydraulic oil in D chamber (20) flows into C chamber (17), the C cavity pressure increases, one-way valve (15) is closed, A chamber (9) replenishes hydraulic oil no longer for C chamber (17), continuing when up E chamber (22) continues from A chamber (9) oil suction, it is up that the hydraulic oil in E chamber continues to promote the 3rd layer of piston (21), until it resets.
CN201310080624.4A 2013-03-14 2013-03-14 A kind of direct-drive supercharged formula of AC servo three layers of piston electrohydraulic cylinder and boosting method Expired - Fee Related CN103148046B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN103850994A (en) * 2014-03-06 2014-06-11 西安交通大学 Electric boosting hydraulic cylinder and boosting method thereof
CN104847714A (en) * 2015-04-20 2015-08-19 大连理工大学 Flow-pressure proportional converting device based on alternating-flow hydraulics
CN104863909A (en) * 2015-04-18 2015-08-26 浙江大学 Spring pressurization closed type hydraulic oil tank with volume, pressure and leakage detecting function
CN105443456A (en) * 2015-12-10 2016-03-30 惠州市超亿数控有限公司 Screw rod pressure cylinder
CN107457340A (en) * 2017-08-30 2017-12-12 兰州兰石集团有限公司 A kind of integrated hybrid drive-type twin-tub tandem supercharging hydraulic press
CN110454460A (en) * 2019-08-28 2019-11-15 邵玉强 A kind of Quick cylinder with function of increasing pressure

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Publication number Priority date Publication date Assignee Title
CN103850994A (en) * 2014-03-06 2014-06-11 西安交通大学 Electric boosting hydraulic cylinder and boosting method thereof
CN103850994B (en) * 2014-03-06 2016-02-24 西安交通大学 A kind of electronic supercharged hydraulic cylinder and boosting method thereof
CN104863909A (en) * 2015-04-18 2015-08-26 浙江大学 Spring pressurization closed type hydraulic oil tank with volume, pressure and leakage detecting function
CN104847714A (en) * 2015-04-20 2015-08-19 大连理工大学 Flow-pressure proportional converting device based on alternating-flow hydraulics
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CN107457340A (en) * 2017-08-30 2017-12-12 兰州兰石集团有限公司 A kind of integrated hybrid drive-type twin-tub tandem supercharging hydraulic press
CN110454460A (en) * 2019-08-28 2019-11-15 邵玉强 A kind of Quick cylinder with function of increasing pressure

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