CN111706559B - Quick stamping hydraulic system - Google Patents
Quick stamping hydraulic system Download PDFInfo
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- CN111706559B CN111706559B CN202010651251.1A CN202010651251A CN111706559B CN 111706559 B CN111706559 B CN 111706559B CN 202010651251 A CN202010651251 A CN 202010651251A CN 111706559 B CN111706559 B CN 111706559B
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- oil cylinder
- quick
- pressure
- oil
- energy accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
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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
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/857—Monitoring of fluid pressure systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Presses (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a quick stamping hydraulic system which comprises a power oil tank, a liquid charging valve, a main oil cylinder, a quick oil cylinder, a sliding block, a return oil cylinder, a supporting energy accumulator, a control energy accumulator, a quick control valve block, an auxiliary control valve, a main pump group, an auxiliary pump group, a pressure regulating valve group, a first pressure sensor for detecting the pressure of the main oil cylinder, a liquid charging oil tank and a second pressure sensor for detecting the pressure of the quick oil cylinder, wherein the main oil cylinder is arranged on the main oil cylinder; the main pump set is connected with the pressure regulating valve set through a pipeline, the pressure regulating valve set is connected with the main oil cylinder through a pipeline, the auxiliary pump set is connected with the control energy accumulator, the quick control valve block and the auxiliary control valve through pipelines, the quick control valve block is connected with the quick oil cylinder through a pipeline, the quick oil cylinder is connected with the sliding block, the support energy accumulator is connected with the return oil cylinder through a pipeline, the return oil cylinder is connected with the sliding block, the liquid filling oil tank is connected with the main oil cylinder through a liquid filling valve, and the main oil cylinder is connected with the sliding block.
Description
Technical Field
The invention belongs to the technical field of hydraulic presses for forming automobile covering parts, and particularly relates to a quick stamping hydraulic system.
Background
The hydraulic press is widely applied to the field of stamping, and a mechanical press is also applied, so that the hydraulic press cannot occupy most of the stamping machine market because the working beat of the hydraulic press is different from the working beat of the mechanical press.
The traditional hydraulic press system is driven by an oil pump to act no matter whether a sliding block moves downwards or returns, and the specific process is as follows: the oil pump drives oil to be injected into the oil cylinder, the oil entering the oil cylinder is continuously compressed, and the oil pressure rises, so that the sliding block is driven to act through the oil cylinder. In the process, the system needs to output signals through a PLC (programmable logic controller), the signals drive a pilot electromagnetic valve to act, the pilot electromagnetic valve drives a cartridge valve to act through control oil, the main oil way oil starts to move and compress after the cartridge valve acts, and the actions of the series of actions all need to be finished by consuming time. The reaction and action time of the hydraulic system is far longer than the mechanical transmission reaction and action time of the mechanical press. The beat of the hydraulic press is limited by the process control time and is far lower than the motion beat of the mechanical press. If the reaction and action time of the hydraulic system can be shortened, the beat of the hydraulic machine can be greatly improved, and the market competitiveness is greatly improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a rapid ram hydraulic system is provided. .
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a quick stamping hydraulic system comprises a power oil tank (1), a liquid charging valve (2), a main oil cylinder (3), a quick oil cylinder (4), a sliding block (5), a return oil cylinder (6), a support energy accumulator (7), a control energy accumulator (8), a quick control valve block (9), an auxiliary control valve (10), a main pump group (11), an auxiliary pump group (12), a pressure regulating valve group (13), a first pressure sensor (14) for detecting the pressure of the main cylinder, a liquid charging oil tank (15) and a second pressure sensor (16) for detecting the pressure of the quick oil cylinder; wherein:
the hydraulic control system is characterized in that a main pump set (11) is connected with a pressure regulating valve set (13) through a pipeline, the pressure regulating valve set (13) is connected with a main oil cylinder (3) through a pipeline, an auxiliary pump set (12) is connected with a control energy accumulator (8), a quick control valve block (9) and an auxiliary control valve (10) through pipelines, the quick control valve block (9) is connected with a quick oil cylinder (4) through a pipeline, the quick oil cylinder (4) is connected with a sliding block (5), a support energy accumulator (7) is connected with a return oil cylinder (6) through a pipeline, the return oil cylinder (6) is connected with the sliding block (5), a liquid filling oil tank (15) is connected with the main oil cylinder (3) through a liquid filling valve (2), and the main oil cylinder (3) is connected with the sliding block (5).
Furthermore, in the action of descending fast, high-pressure fluid passes through quick control valve piece (9) in control energy storage ware (8) and supplies fluid with quick hydro-cylinder (4), return stroke hydro-cylinder (6) fluid is passive to be saved into and supports energy storage ware (7), when the slider traveles to operating position fast, is supplied with the fluid of master cylinder (3) by main pump package (11) and pressurizes the master cylinder, and after the punching press was accomplished, the quick pressure release fluid of master cylinder, quick hydro-cylinder (4) under the controllable circumstances of flow, support energy storage ware (7) passive release fluid drive return stroke hydro-cylinder (6) return stroke.
The invention has the advantages and positive effects that:
by adopting the technical scheme, the invention does not adopt a transmission control mode and an oil hydraulic compression mode, shortens the action time of the descending and returning of the sliding block and achieves the purpose of improving the beat.
Description of the drawings:
FIG. 1 is a hydraulic schematic of the system of the present invention;
in fig. 1, a power oil tank; 2. a liquid filling valve 3, a main oil cylinder 4 and a quick oil cylinder; 5. a slider; 6. a return oil cylinder; 7. supporting an accumulator; 8. controlling the accumulator; 9. a fast control valve block; 10. an auxiliary control valve; 11. a main pump group; 12. an auxiliary pump group; 13. a pressure regulating valve group; 14. a first pressure sensor; 15. a liquid-filled oil tank; 16. a second pressure sensor.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the embodiments are illustrated in the following detailed description with reference to the accompanying drawings:
referring to fig. 1, a hydraulic system for rapid punching includes: the hydraulic control system comprises a power oil tank 1, a liquid charging valve 2, a main oil cylinder 3, a quick oil cylinder 4, a sliding block 5, a return oil cylinder 6, a support energy accumulator 7, a control energy accumulator 8, a quick control valve block 9, an auxiliary control valve 10, a main pump group 11, an auxiliary pump group 12, a pressure regulating valve group 13, a first pressure sensor 14 for detecting the pressure of the main oil cylinder 3, a liquid charging oil tank 15 and a second pressure sensor 16 for detecting the pressure of the quick oil cylinder 4.
The control energy accumulator 8, the quick control valve block 9, the auxiliary control valve 10, the main pump group 11, the auxiliary pump group 12 and the pressure regulating valve group 13 are all arranged above the power oil tank 1, the main pump group 11 is connected with the pressure regulating valve group 13 through a pipeline, the pressure regulating valve group 13 is connected with the main oil cylinder 3 through a pipeline, a pressure sensor 14 is arranged on the pipeline and used for detecting the pressure of the main cylinder, the auxiliary pump group 12 is connected with the control energy accumulator 8, the quick control valve block 9 and the auxiliary control valve 10 through a pipeline, the quick control valve block 9 is connected with the quick oil cylinder 4 through a pipeline, a pressure sensor 16 is arranged on the pipeline and used for detecting the pressure of the quick oil cylinder, the quick oil cylinder 4 is connected with the sliding block 5, the support energy accumulator 7 is connected with the return oil cylinder 6 through a pipeline, the return oil cylinder 6 is connected with the sliding block 5, the liquid filling oil tank 15 is arranged above the main oil cylinder 3 and is connected with the main oil cylinder 3 through the liquid filling valve 2, the main oil cylinder 3 is connected with the slide block 5.
In the fast descending action, high-pressure oil in the control energy accumulator 8 is used for supplying the oil to the fast oil cylinder 4 through the fast control valve block 9, the oil in the return oil cylinder 6 is passively stored in the support energy accumulator 7, when the sliding block rapidly runs to a working position, the main pump group 11 supplies oil to the main oil cylinder 3 for fast releasing, and the support energy accumulator 7 passively releases the oil to drive the return oil cylinder 6 to return.
Wherein: an auxiliary pump set 12 supplies oil, oil enters a control energy accumulator 8 and enters a quick oil cylinder 4 through a quick control valve block 9, the oil in a return oil cylinder 6 enters a support energy accumulator 7 under pressure, meanwhile, a main oil cylinder 3 quickly supplements the oil through a liquid charging valve 2, then the main pump set 11 pressurizes the main oil cylinder 3 downwards, a pressure adjusting valve group 13 and a pressure sensor 14 control pressurization pressure and quick pressure relief, the quick control valve block 9 controls the return of the quick oil cylinder 4, and the support energy accumulator 7 passively releases the oil to drive the return oil cylinder 6, so that the purpose of quick stamping of a hydraulic machine is achieved.
The working conditions of the rapid stamping hydraulic system are as follows:
before a hydraulic press system works, oil is supplied through an auxiliary pump group 12, oil is injected into a control energy accumulator 8, the pressure of the injected oil is matched with the type selection of the energy accumulator, whether the pressure reaches a set pressure is detected through a pressure sensor, the pressure of the support energy accumulator 7 is also increased by injecting the oil in advance, the injection pressure meets the requirement that a support sliding block and a die reach the initial position, when an equipment sliding block starts to act, a quick control valve block 9 controls and controls high-pressure oil in the energy accumulator 8 to quickly enter a quick oil cylinder 4, the pressure of the quick oil cylinder is greater than the supporting force of a return oil cylinder 6, the return oil cylinder 6 contracts and descends, the oil in the quick control valve block enters the support energy accumulator 7 under pressure, the support energy accumulator 7 starts to store energy, meanwhile, the main oil cylinder 3 quickly supplements the oil through a liquid filling valve 2, when the sliding block contacts with a load, a main pump group 11 starts to pressurize the main oil cylinder 3, the sliding block starts to pressurize and descend, the pressure of the sliding block rises continuously, the pressure regulating valve group 13 and the pressure sensor 14 are used for controlling the pressure of the sliding block, the pressure is released quickly after the pressure is released, the quick control valve block 9 controls the return stroke of the quick oil cylinder 4 by discharging oil to the oil tank 1 after the pressure is released, and the energy accumulator 7 is supported to release oil passively to drive the return oil cylinder 6, so that the purpose of quick stamping of the hydraulic machine is achieved, and the hydraulic press can be widely used for conventional hydraulic machine equipment.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (1)
1. A quick stamping hydraulic system is characterized by comprising a power oil tank (1), a liquid charging valve (2), a main oil cylinder (3), a quick oil cylinder (4), a sliding block (5), a return oil cylinder (6), a supporting energy accumulator (7), a control energy accumulator (8), a quick control valve block (9), an auxiliary control valve (10), a main pump group (11), an auxiliary pump group (12), a pressure regulating valve group (13), a first pressure sensor (14) for detecting the pressure of the main oil cylinder, a liquid charging oil tank (15) and a second pressure sensor (16) for detecting the pressure of the quick oil cylinder; wherein:
the main pump set (11) is connected with a pressure regulating valve set (13) through a pipeline, the pressure regulating valve set (13) is connected with a main oil cylinder (3) through a pipeline, the auxiliary pump set (12) is connected with a control energy accumulator (8), a quick control valve block (9) and an auxiliary control valve (10) through pipelines, the quick control valve block (9) is connected with a quick oil cylinder (4) through a pipeline, the quick oil cylinder (4) is connected with a sliding block (5), the support energy accumulator (7) is connected with a return oil cylinder (6) through a pipeline, the return oil cylinder (6) is connected with the sliding block (5), the liquid filling oil tank (15) is connected with the main oil cylinder (3) through a liquid filling valve (2), and the main oil cylinder (3) is connected with the sliding block (5);
before a hydraulic press system works, oil is supplied through an auxiliary pump group (12), oil is injected into a control energy accumulator (8) and a support energy accumulator (7), whether the oil pressure of the control energy accumulator (8) reaches a set pressure is detected through a pressure sensor, when a sliding block starts to act, a quick control valve block (9) controls high-pressure oil in the control energy accumulator (8) to quickly enter a quick oil cylinder (4), the pressure of the quick oil cylinder is larger than the supporting force of a return oil cylinder (6), the return oil cylinder (6) contracts and descends, the oil in the return oil cylinder (6) enters the support energy accumulator (7) under pressure, the support energy accumulator (7) starts to store energy, meanwhile, a main oil cylinder (3) quickly supplements the oil through a liquid filling valve (2), when the sliding block contacts a load, the main pump group (11) starts to pressurize the main oil cylinder (3), the sliding block starts to pressurize and descends, and the pressure of the sliding block continuously rises, the pressure regulating valve group (13) and the pressure sensor (14) are used for controlling the slider to pressurize, the slider begins to quickly release pressure after pressurization is completed, the quick control valve block (9) controls the return stroke of the quick oil cylinder (4) by discharging oil to the oil tank (1) after pressure release is completed, and the energy accumulator (7) is supported to passively release oil to drive the return oil cylinder (6) at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010651251.1A CN111706559B (en) | 2020-07-08 | 2020-07-08 | Quick stamping hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010651251.1A CN111706559B (en) | 2020-07-08 | 2020-07-08 | Quick stamping hydraulic system |
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| Publication Number | Publication Date |
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| CN111706559A CN111706559A (en) | 2020-09-25 |
| CN111706559B true CN111706559B (en) | 2022-03-15 |
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| CN202010651251.1A Active CN111706559B (en) | 2020-07-08 | 2020-07-08 | Quick stamping hydraulic system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664494B (en) * | 2020-12-04 | 2023-05-23 | 天津天锻航空科技有限公司 | Hydraulic control system of double-acting liquid-filled forming hydraulic press |
| CN114483680B (en) * | 2022-01-20 | 2024-01-05 | 佛山市玛盛机械科技有限公司 | Large-tonnage metal hot forging forming equipment with hydraulic energy storage function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205243974U (en) * | 2015-11-27 | 2016-05-18 | 南通锻压设备股份有限公司 | Suppress hydraulic press hydraulic system fast |
| CN105619875B (en) * | 2016-03-17 | 2017-04-12 | 南京宁锻重工机械制造有限公司 | High-speed hydraulic punching machine |
| CN207028305U (en) * | 2017-07-03 | 2018-02-23 | 江苏国力锻压机床有限公司 | A kind of hydraulic press of quick return |
| CN207026578U (en) * | 2017-08-16 | 2018-02-23 | 安徽哈科数控机床制造有限公司 | A kind of accumulation of energy return-stroke type hydraulic system of cutting machine |
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| CN111706559A (en) | 2020-09-25 |
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