CN112873986A - Hydraulic stretching pad with pre-accelerating function for press machine - Google Patents
Hydraulic stretching pad with pre-accelerating function for press machine Download PDFInfo
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- CN112873986A CN112873986A CN202110386079.6A CN202110386079A CN112873986A CN 112873986 A CN112873986 A CN 112873986A CN 202110386079 A CN202110386079 A CN 202110386079A CN 112873986 A CN112873986 A CN 112873986A
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- 238000006073 displacement reaction Methods 0.000 claims description 45
- 230000002457 bidirectional effect Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0052—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for fluid driven presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/166—Electrical control arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a hydraulic stretching pad of a press machine with a pre-accelerating function, which comprises a cross beam, a stand column, a slide block, an upper die, a lower die, a workbench, a press machine base, a stretching pad plate, a supporting pin, a blank holder, a press machine driving motor, a crankshaft, a connecting rod, a hydraulic circuit, a hydraulic cylinder, a hydraulic pad structure and a control device. The hydraulic stretching pad has a pre-accelerating function, and can realize the effect of inhibiting contact impact under the condition of not sacrificing the effective stretching stroke of a plate; the hydraulic cushion power generation mechanism can convert pressure energy stored under the high-pressure working condition of hydraulic oil into electric energy through the variable motor and the electric motor to feed back the electric energy to the power supply bus of the press machine, so that the circulation of energy flow between the press machine and the hydraulic cushion is realized, and the electric power resource is obviously saved.
Description
Technical Field
The invention relates to a hydraulic stretching pad with a pre-accelerating function for a press machine, and belongs to the technical field of mechanical industry of press machines.
Background
The drawing pad is a main functional component of the press, and the function of the drawing pad is to press the plate materials before the slide block moves downwards for forming and press the edges during the forming process so as to prevent the wrinkling caused by the too fast flowing of the materials during the forming of the plate materials. When the early press machine is used for forming large-scale covering parts of plates, a double-action press machine is generally adopted, an outer slide block is used for pressing edges, and an inner slide block is used for stretching. With the technical development of large-tonnage drawing pads, the edge pressing function of the outer slide block of the press machine is gradually replaced by the drawing pad, and the structural form of the drawing pad is gradually developed into various forms such as a pneumatic drawing pad, an electric drawing pad, a hydraulic drawing pad and the like. The pure gas air cushion has the compressible characteristic of gas, and the gas in the cylinder body has larger pressure fluctuation when being pressed, so that the blank pressing force of a workpiece is unstable, uneven ripples exist on the surface of a stamping forming plate, and the cylinder body of the large-tonnage air cushion has a limited installation space due to an overlarge diameter, so that the blank pressing force is also limited to a certain extent. The electric stretching pad generally realizes the position control and the edge pressing force control of the stretching pad by driving a screw nut mechanism, a connecting rod mechanism and a gear rack mechanism through a motor, but the mechanical structure has high rigidity, the instant impact force of the upper die and the lower die contacting the plate is large, and the damage risk to the die and the stretching pad is high. The hydraulic stretching pad is connected with a hydraulic pump/motor through a motor to drive a hydraulic cylinder to reciprocate, so that the lifting of the stretching pad is realized, and the self flexibility of a hydraulic system effectively avoids the damage of the pure rigid mechanical structure of the electric servo pad to the mechanical structure caused by instant impact; the liquid medium self yieldability compares gas and needs little more, and in the course of the work, hydraulic cushion blank holder force is more stable, can effectively improve product quality. The hydraulic stretching pad described in patent document 1 (No. CN 101175585B) "die cushion device of press machine" and patent document 2 (No. CN 102215996B) "cushion device for press machine" achieves the effect of suppressing the contact impact force by switching to the force control mode to operate the servo motor or the proportional valve in advance when suppressing the contact impact force, but this control mode has a disadvantage that the force control mode has already entered the stage of stretch forming of the sheet material, and the suppression of the impact force in this stage sacrifices the effective stretch stroke of the sheet material, affecting the final forming quality of the sheet material. And contact impact is not always disadvantageous, and the desired blank hold force can be quickly obtained by utilizing the contact impact force to a certain extent outside the non-working stroke range.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hydraulic stretching pad with a pre-accelerating function for a press machine aiming at the defects in the prior art.
In order to solve the technical problem, the invention provides a hydraulic stretching pad of a press machine with a pre-accelerating function, which comprises a cross beam, upright posts, a sliding block, an upper die, a lower die, a workbench, a press machine base, a stretching base plate, a supporting pin, a blank holder, a press machine driving motor, a crankshaft, a connecting rod, a hydraulic circuit, a hydraulic cylinder, a hydraulic pad structure and a control device, wherein the press machine base is fixedly arranged on a foundation, two upright posts are vertically arranged on two sides of the press machine base, the cross beam is arranged at the top ends of the two upright posts, the sliding block is arranged between the two upright posts and is guided by the upright posts, and the workbench is arranged on the upper top; the inside of the cross beam is powered by a motor and drives a crankshaft to rotate, and the encoder is arranged on the motor; the upper end of the connecting rod is arranged on the crankshaft, and the lower end of the connecting rod is connected with the sliding block and drives the sliding block to move up and down linearly; the upper die is arranged on the bottom surface of the sliding block, and the lower die is arranged on the workbench; the blank holder is supported between the upper die and the lower die by a support pin, the lower end of the support pin is supported by a stretching base plate, the lower bottom surface of the stretching base plate is connected with a hydraulic cylinder and drives the hydraulic cylinder to move up and down by a hydraulic circuit, and a plate to be formed is placed on the blank holder to wait for punching.
The hydraulic cushion structure comprises a tensile cushion plate, a hydraulic cylinder, a displacement sensor, a one-way valve, an energy accumulator, an overflow valve, a bidirectional variable pump/variable motor, a hydraulic cushion motor, a pressure sensor, a variable pump displacement detector, a two-position two-way directional valve, a fixed displacement pump/motor and an oil tank, wherein the displacement sensor is arranged in an inner cavity of the hydraulic cylinder and used for detecting the displacement of a piston, and the one-way valve is arranged between the low-pressure side of an upper cavity of the hydraulic cylinder and the high-pressure side of a lower cavity of the hydraulic cylinder and used for realizing the quick return of; the energy accumulator is used as an oil storage device of the whole hydraulic system to play a role in quickly supplementing oil; the overflow valve is used for preventing equipment from being damaged when the system pressure is abnormal; the pressure sensor is used for monitoring the high-pressure side pressure of the hydraulic cylinder; one outlet of the bidirectional variable pump/variable motor is connected with the high-pressure side of the lower cavity of the hydraulic cylinder, and the other outlet of the bidirectional variable pump/variable motor is connected with the low-pressure side of the upper cavity of the hydraulic cylinder; the hydraulic cushion motor is connected with the rotating shaft of the bidirectional variable pump/variable motor.
The control device is composed of a press machine controller and a press machine motor driving module which jointly form an energy module of the stamping equipment; the hydraulic cushion pressure/position controller receives a rotating speed signal of a driving motor of a press machine, calculates the signal in the hydraulic cushion pressure/position controller and converts the signal into a slide block displacement and speed signal, receives a displacement signal of a piston of a displacement detector in a hydraulic cylinder, calculates the signal in the hydraulic cushion pressure/position controller and converts the signal into a hydraulic cylinder speed signal, receives a high-pressure side pressure sensor signal of the hydraulic cylinder and receives a variable pump displacement adjusting signal of a variable pump displacement detector; and adjusting the displacement of a variable pump motor according to the command sent by the hydraulic cushion pressure/position controller, the signal detected by the encoder and the signal detected by the pressure detector, so that the blank pressing force of the plate material is consistent with the blank pressing force instructed by the hydraulic cushion pressure/position controller.
The hydraulic cushion structure comprises a plurality of groups of hydraulic cylinders, the high-pressure sides of the upper cavities of the hydraulic cylinders share one hydraulic pipeline for connection, and the low-pressure sides of the lower cavities of the hydraulic cylinders share one hydraulic pipeline for connection, so that a larger plate blank pressing force is obtained.
The electric motor drives both the variable pump/variable motor and the bidirectional fixed displacement pump/fixed displacement motor.
Has the advantages that: the hydraulic stretching pad has a pre-accelerating function, and can realize the effect of inhibiting contact impact under the condition of not sacrificing the effective stretching stroke of a plate; the hydraulic cushion power generation mechanism can convert pressure energy stored under the high-pressure working condition of hydraulic oil into electric energy through the variable motor and the electric motor to feed back the electric energy to the power supply bus of the press machine, so that the circulation of energy flow between the press machine and the hydraulic cushion is realized, and the electric power resource is obviously saved.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a partial enlarged view of the first embodiment of the present invention;
FIG. 3 is a schematic view of a control device according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a third embodiment of the present invention;
in the figure: 101 cross beam, 102 upright post, 103 slide block, 104 upper die, 105 lower die, 106 workbench, 107 press base, 201 stretching pad plate, 202 supporting pin, 203 blank holder, 301 press driving motor, 302 driving motor encoder, 303 crankshaft, 304 connecting rod, 400 hydraulic circuit, 401 hydraulic cylinder, 401a hydraulic cylinder upper chamber low pressure side, 401b hydraulic cylinder lower chamber high pressure side, 402 displacement detector, 403 one-way valve, 404 accumulator, 405 overflow valve, 406 bidirectional variable pump/variable motor, 407 hydraulic pad motor, 408 pressure detector, 409 variable pump displacement detector, 410 two-position two-way directional valve, 411 fixed displacement pump/motor, 412 oil tank, 500 stamping device energy module, 501 rectifying unit, 502 alternating current and direct current conversion device, 503 hydraulic pad motor driving module, 504 hydraulic pad pressure/position controller.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the invention provides a hydraulic stretching pad of a press with a pre-accelerating function, which comprises a cross beam 101, columns 102, a slide block 103, an upper die 104, a lower die 105, a workbench 106, a press base 107, a stretching pad plate 201, a supporting pin 202, a blank holder 203, a press driving motor 301, a driving motor encoder 302, a crankshaft 303, a connecting rod 304, a hydraulic circuit 400, a hydraulic cylinder 401, a hydraulic pad structure and a control device, wherein the press base 107 is fixedly installed on a foundation, the two columns 102 are vertically installed on two sides of the press base 107, the cross beam 101 is installed at the top ends of the two columns 102, the slide block 103 is installed between the two columns 102 and is guided by the columns 102, and the workbench 106 is installed on the upper top surface of the press base 107; the inside of the cross beam 101 is powered by a press machine driving motor 301 and drives a crankshaft 303 to rotate, and a driving motor encoder 302 is arranged on the press machine driving motor 301 and used for detecting the rotating speed of the motor; the upper end of the connecting rod 304 is arranged on the crankshaft 303, and the lower end of the connecting rod 304 is connected with the sliding block 103 and drives the sliding block 103 to move up and down linearly; an upper die 104 is arranged on the bottom surface of the slide block 103, and a lower die 105 is arranged on a workbench 106; the blank holder 203 is supported between the upper die 104 and the lower die 105 by a support pin 202, the lower end of the support pin 202 is supported by a stretching backing plate 201, the lower bottom surface of the stretching backing plate 201 is connected with a hydraulic cylinder 401, the hydraulic cylinder 401 is driven by a hydraulic circuit 400 to move up and down, and a plate material to be formed is placed on the blank holder 203 and waits for punching.
As shown in fig. 2, the hydraulic pad structure includes a tensile pad 201, a hydraulic cylinder 401, a displacement sensor 402, a check valve 403, an accumulator 404, an overflow valve 405, a bidirectional variable pump/variable motor 406, a hydraulic pad motor 407, a pressure sensor 408, a variable pump displacement detector 409, a two-position two-way directional valve 410, a fixed displacement pump/motor 411 and an oil tank 412, wherein the displacement sensor 402 is installed in an inner cavity of the hydraulic cylinder 401 and is used for detecting the displacement of a piston, and the check valve 403 is installed between a low-pressure side 401a of an upper cavity of the hydraulic cylinder and a high-pressure side 401b of a lower cavity of the hydraulic cylinder and is used for realizing the quick return of the hydraulic cylinder 401; the accumulator 404 serves as an oil storage device of the whole hydraulic system to achieve the function of quickly supplementing oil; the relief valve 405 is used to prevent equipment damage when the system pressure is abnormal; the pressure sensor 408 is used for monitoring the high-pressure side pressure of the hydraulic cylinder; one outlet of the bidirectional variable pump/variable motor 406 is connected with the high-pressure side 401b of the lower cavity of the hydraulic cylinder, and the other outlet is connected with the low-pressure side 401a of the upper cavity of the hydraulic cylinder; the hydraulic pad motor 407 is connected to the rotating shaft of the bidirectional variable pump/variable motor 406.
As shown in fig. 3, the control device is composed of a press machine controller and a press machine motor driving module which together form a stamping device energy module 500; the device comprises a hydraulic cushion pressure/position controller 504, a hydraulic cushion motor driving module 503, an alternating current-direct current conversion device 502 and a rectification unit 501, wherein the hydraulic cushion pressure/position controller 504 receives a rotating speed signal of a press machine driving motor 302, calculates the signal in the hydraulic cushion pressure/position controller 504 and converts the signal into a slide displacement and speed signal; receiving the displacement signal from the piston of the in-cylinder displacement detector 402 and converting the signal into a cylinder velocity signal after calculating the signal in the pad pressure/position controller 504; receiving a signal from a cylinder high side pressure sensor 408; receiving a variable pump displacement adjusting signal of a variable pump displacement detector 409; the displacement of the variable displacement pump motor is adjusted according to the command from the pad pressure/position controller 504, the signal detected by the encoder, and the signal detected by the pressure detector, so that the blank holder force of the sheet material is consistent with the blank holder force commanded by the pad pressure/position controller.
The working process is as follows: the slider 103 descends from a slider starting point (270mm), the hydraulic cushion pressure/position controller 504 receives data of the driving motor encoder 302 to monitor the displacement and speed of the slider in real time, when the slider reaches about 200mm, the hydraulic cushion controller 504 issues a command to enable the hydraulic cushion motor 407 to rotate and simultaneously adjust the flow of the bidirectional variable pump/variable motor 406 to enable hydraulic oil to rapidly enter the lower pressure side 401a of the upper cavity of the hydraulic cylinder 401, the piston of the hydraulic cylinder descends in an accelerated manner, the hydraulic cushion pressure/position controller 504 sets the speed difference between the slider and the hydraulic cushion in advance, the descending speed of the hydraulic cylinder 401 is guaranteed to be always smaller than the speed of the slider, and the speed difference command is cancelled until the sheet material contact point is reached; the hydraulic cushion is accelerated to descend in advance before the plate contact point, the speed difference between the hydraulic cushion and the sliding block is reduced, the amplitude of the contact impact force is effectively reduced, and the blank holder driven by the upper hydraulic cushion is chased and contacted with the hydraulic cushion in advance before the plate contact point, so that the high-pressure side pressure of the 401 hydraulic cylinder is slowly raised in advance to play a role in pre-building pressure; when the pressure reaches a plate contact point, the hydraulic cushion control mode is switched to a force control mode, the hydraulic cushion follows the slide block to move downwards, the hydraulic cushion pressure/position controller 504 obtains a pressure detector 408 signal in real time and compares the signal with a set blank pressing force, the real-time adjustment of the blank pressing force is realized by adjusting the flow of the bidirectional variable pump/variable motor 406, at the moment, the high-pressure-side hydraulic oil drives the variable motor and overcomes the torque output by the hydraulic cushion motor 407, the hydraulic cushion motor 407 is in a power generation state, the electric energy is fed back to a press machine bus through the hydraulic cushion motor driving module 503 and the alternating current-direct current conversion device 502, the press machine-hydraulic cushion energy networking is realized, the fed-back electric energy can be used for the punching or hydraulic cushion work of the press machine; the pressure of the press machine needs to be maintained for about 2 seconds to prevent the plate from rebounding and deforming, and the motor stops locking at the moment to keep the pressure of the lower cavity of the hydraulic cylinder; the slider is moved upwards for about 3 seconds, the hydraulic pad control mode is switched to the position control mode for about 4 seconds, the motor is reversely rotated to enable hydraulic oil to enter the lower cavity of the hydraulic cylinder, and the hydraulic pad is lifted to the starting point of the hydraulic pad to wait for the next work cycle.
Example 2
As shown in fig. 4, compared to embodiment 1, the hydraulic pad structure is provided with a plurality of sets of hydraulic cylinders 401 and 401 'supporting tension pads, the upper chamber high pressure sides 401a and 401 a' of the hydraulic cylinders 401 and 401 'share a hydraulic line for connection, and the lower chamber low pressure sides 401b and 401 b' of the hydraulic cylinders share a hydraulic line for connection; the sectional area of the hydraulic cylinders can be increased by using a plurality of groups of hydraulic cylinders so as to obtain larger blank holder force.
Example 3
As shown in fig. 5, the pad motor 407 drives the bidirectional variable pump/variable motor 406 and the bidirectional fixed displacement pump/fixed displacement motor 411 at the same time, as compared with embodiment 1. The bidirectional constant delivery pump/constant delivery motor 411 is used for increasing the flow entering the upper cavity 401a of the hydraulic cylinder at the pre-acceleration stage of the hydraulic cylinder 401, increasing the pre-acceleration speed and reducing the contact impact force; the variable motor and the quantitative motor drive the electric motor to rotate together in the stage that the hydraulic cushion moves along with the sliding block, so that the generated energy is increased.
The above-described embodiments of the invention are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (5)
1. The utility model provides a tensile pad of press hydraulic pressure with accelerate function in advance which characterized in that: the hydraulic press comprises a cross beam (101), upright columns (102), a sliding block (103), an upper die (104), a lower die (105), a workbench (106), a press machine base (107), a drawing base plate (201), a supporting pin (202), a blank holder (203), a press machine driving motor (301), a driving motor encoder (302), a crankshaft (303), a connecting rod (304), a hydraulic circuit (400), a hydraulic cylinder (401), a hydraulic pad structure and a control device, wherein the press machine base (107) is fixedly installed on a foundation, the two upright columns (102) are vertically installed on two sides of the press machine base (107), the cross beam (101) is installed at the top ends of the two upright columns (102), the sliding block (103) is installed between the two upright columns (102) and is guided by the upright columns (102), and the workbench (106) is installed on the upper top surface of the press machine base (; the inside of the cross beam (101) is powered by a press machine driving motor (301) and drives a crankshaft (303) to rotate, and a driving motor encoder (302) is arranged on the press machine driving motor (301); the upper end of the connecting rod (304) is arranged on the crankshaft (303), and the lower end of the connecting rod (304) is connected with the sliding block (103) and drives the sliding block (103) to move linearly up and down; the upper die (104) is arranged on the bottom surface of the sliding block (103), and the lower die (105) is arranged on the workbench (106); the blank holder (203) is supported between the upper die (104) and the lower die (105) by the supporting pin (202), the lower end of the supporting pin (202) is supported by the stretching base plate (201), the lower bottom surface of the stretching base plate (201) is connected with the hydraulic cylinder (401) and the hydraulic cylinder (401) is driven by the hydraulic circuit (400) to move up and down, and a plate to be formed is placed on the blank holder (203) to wait for stamping.
2. The hydraulic stretching pad of a press with a pre-acceleration function as claimed in claim 1, wherein: the hydraulic cushion structure comprises a tensile cushion plate (201), a hydraulic cylinder (401), a displacement sensor (402), a one-way valve (403), an energy accumulator (404), an overflow valve (405), a bidirectional variable pump/variable motor (406), a hydraulic cushion motor (407), a pressure sensor (408), a variable pump displacement detector (409), a two-position two-way directional valve (410), a fixed displacement pump/motor (411) and an oil tank (412), wherein the displacement sensor (402) is installed in an inner cavity of the hydraulic cylinder (401) and used for detecting the displacement of a piston, and the one-way valve (403) is installed between a low-pressure side (401a) of an upper cavity of the hydraulic cylinder and a high-pressure side (401b) of a lower cavity of the hydraulic cylinder and used for realizing the quick return of the hydraulic cylinder (401); the energy accumulator (404) is used as an oil storage device of the whole hydraulic system to play a role in quickly supplementing oil; the overflow valve (405) is used for preventing equipment from being damaged when the system pressure is abnormal; the pressure sensor (408) is used for monitoring the high-pressure side pressure of the hydraulic cylinder; one outlet of the bidirectional variable pump/variable motor (406) is connected with the high-pressure side (401b) of the lower cavity of the hydraulic cylinder, and the other outlet of the bidirectional variable pump/variable motor is connected with the low-pressure side (401a) of the upper cavity of the hydraulic cylinder; the hydraulic cushion motor (407) is connected to the rotating shaft of the bidirectional variable pump/variable motor (406).
3. The hydraulic stretching pad of a press with a pre-acceleration function as claimed in claim 1, wherein: the control device is characterized in that a press machine controller and a press machine motor driving module jointly form a stamping equipment energy module (500); the device comprises a hydraulic cushion pressure/position controller (504), a hydraulic cushion motor driving module (503), an alternating current-direct current conversion device (502) and a rectification unit (501), wherein the hydraulic cushion pressure/position controller (504) receives a rotating speed signal of a press machine driving motor (302), calculates the signal in the hydraulic cushion pressure/position controller (504) and converts the signal into a slider displacement and speed signal, receives a displacement signal of a piston of a displacement detector (402) in a hydraulic cylinder, calculates the signal in the hydraulic cushion pressure/position controller (504) and converts the signal into a hydraulic cylinder speed signal, receives a signal of a high-pressure side pressure sensor (408) of the hydraulic cylinder and receives a variable pump displacement adjusting signal of a variable pump displacement detector (409); the displacement of the variable displacement pump motor is adjusted according to the command from the hydraulic pad pressure/position controller (504), the signal detected by the encoder and the signal detected by the pressure detector, so that the blank holder force of the sheet material is consistent with the blank holder force commanded by the hydraulic pad pressure/position controller.
4. The hydraulic stretching pad of a press with a pre-acceleration function as claimed in claim 1, 2 or 3, wherein: the hydraulic cushion structure is provided with a plurality of groups of hydraulic cylinders (401) and (401 '), the upper cavity high-pressure sides (401a) and (401 a') of the hydraulic cylinders (401) and (401 ') share one hydraulic pipeline for connection, and the lower cavity low-pressure sides (401b) and (401 b') of the hydraulic cylinders share one hydraulic pipeline for connection, so that a larger plate blank pressing force is obtained.
5. The hydraulic stretching pad of a press with a pre-accelerating function as claimed in claim 2, wherein: the electric motor (407) drives both a variable pump/variable motor (406) and a bidirectional fixed displacement pump/fixed displacement motor (411).
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| CN202110386079.6A CN112873986B (en) | 2021-04-12 | 2021-04-12 | Hydraulic stretching pad of press with pre-acceleration function |
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| CN202110386079.6A CN112873986B (en) | 2021-04-12 | 2021-04-12 | Hydraulic stretching pad of press with pre-acceleration function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505438A (en) * | 2022-04-02 | 2022-05-17 | 太原理工大学 | A high-power electro-hydraulic control press system |
| CN114515783A (en) * | 2022-03-03 | 2022-05-20 | 济南二机床集团有限公司 | Servo stretching pad with energy feedback for gear and rack transmission |
| CN115163618A (en) * | 2022-02-22 | 2022-10-11 | 华侨大学 | Rotary driving device based on electro-hydraulic compound drive |
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| CN215620223U (en) * | 2021-04-12 | 2022-01-25 | 济南二机床集团有限公司 | Hydraulic stretching pad with pre-accelerating function for press machine |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115163618A (en) * | 2022-02-22 | 2022-10-11 | 华侨大学 | Rotary driving device based on electro-hydraulic compound drive |
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| CN112873986B (en) | 2024-08-06 |
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