CN114087244B - Release-resisting oil circuit based on passive die opening working condition of press - Google Patents
Release-resisting oil circuit based on passive die opening working condition of press Download PDFInfo
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- CN114087244B CN114087244B CN202111363534.7A CN202111363534A CN114087244B CN 114087244 B CN114087244 B CN 114087244B CN 202111363534 A CN202111363534 A CN 202111363534A CN 114087244 B CN114087244 B CN 114087244B
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- 238000013016 damping Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 148
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 43
- 229910052757 nitrogen Inorganic materials 0.000 description 22
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
- F15B2013/004—Cartridge valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Presses (AREA)
Abstract
The invention relates to the field of oil way design of presses, in particular to a release-resistant oil way based on a passive mold opening working condition of a press, which comprises a main oil cylinder and an oil tank, wherein a first cartridge valve is connected between an upper cavity of the main oil cylinder and the oil tank, a pilot electromagnetic valve is connected between a control cavity of the first cartridge valve and the oil tank, a second cartridge valve is connected between an upper cavity of the main oil cylinder and a lower cavity of the main oil cylinder, and a hydraulic control reversing valve is connected between a control cavity of the second cartridge valve and the upper cavity of the main oil cylinder. The problem of sinking phenomenon has been solved to this scheme, realizes more stable, efficient die sinking.
Description
Technical Field
The invention relates to the field of oil circuit design of presses, in particular to a release-resisting oil circuit based on a passive die opening working condition of a press.
Background
The nitrogen cylinder is also called as a nitrogen spring, and has the advantages of small volume, pressure in an initial state, no need of pre-tightening, relatively gentle pressure change of the whole stroke and the like, so that the nitrogen cylinder gradually replaces the traditional elastic element and is widely applied to the design and manufacture of the die.
However, because the nitrogen cylinder has no end locking function, after the die is closed, the spring force of the nitrogen cylinder always acts on the upper die, and the following defects are caused when the die is opened according to the conventional oil way control: 1. if the pressure of the main oil cylinder is released too fast, the vibration of the upper die is aggravated, thereby affecting the quality of die opening. 2. If the pressure release of the main oil cylinder is slower, the production efficiency is affected. 3. If the oil way is controlled by a proportional valve with a large path, the cost of the whole control oil way is much higher. 4. The oil inlet timing of the lower cavity of the main oil cylinder is not well controlled, the phenomenon of impact vibration is caused to the piston of the main oil cylinder by the too early oil inlet of the lower cavity, the piston of the main oil cylinder moves upwards rapidly under the action of a spring force by the too late oil inlet of the lower cavity, and the phenomenon of sinking of downward movement can occur after the piston of the main oil cylinder moves upwards because the lower cavity is not filled with hydraulic oil in time.
Therefore, the control difficulty of the press in the die opening stage in the prior art is high, and a control oil way with higher efficiency and better cost performance is urgently needed to be designed.
Disclosure of Invention
The invention aims to provide a release-resisting oil way based on a passive die opening working condition of a press so as to solve the problem of sinking phenomenon pointed out by the background technology and realize more stable and efficient die opening.
In order to achieve the above purpose, the invention adopts the following technical scheme: a release-resistant oil way based on a press under a passive mold opening working condition comprises a main oil cylinder and an oil tank, wherein a first cartridge valve is connected between an upper cavity of the main oil cylinder and the oil tank, a pilot electromagnetic valve is connected between a control cavity of the first cartridge valve and the oil tank, a second cartridge valve is connected between an upper cavity of the main oil cylinder and a lower cavity of the main oil cylinder, and a hydraulic control reversing valve is connected between a control cavity of the second cartridge valve and the upper cavity of the main oil cylinder.
The principle and the advantages of the scheme are as follows: when the pressure release starts, the pilot electromagnetic valve is electrified, the pilot electromagnetic valve is opened, the pilot electromagnetic valve controls the hydraulic oil in the control cavity of the first cartridge valve to release, the first cartridge valve is opened, and the oil in the upper cavity of the main oil cylinder is released through the first cartridge valve. Then the hydraulic control reversing valve senses the pressure in the upper cavity of the main oil cylinder, when the oil pressure in the upper cavity of the main oil cylinder is reduced to the pressure set by the hydraulic control reversing valve, the hydraulic oil in the control cavity of the second cartridge valve is released, the second cartridge valve is opened, the oil in the upper cavity of the main oil cylinder is discharged into the lower cavity, the lower cavity of the main oil cylinder is subjected to fluid supplementing pre-tightening, and at the moment, the sliding block and the die connected to the main oil cylinder start to open the die upwards under the pushing of the nitrogen cylinder.
Therefore, when the technical scheme is adopted, the method has the following beneficial effects: 1. the pressure release and release loop adopts the first cartridge valve as a main control element, and can realize active intervention without a proportional valve, so that the cost of the whole control oil way is greatly reduced compared with the proportional valve. 2. Whether the first cartridge valve is opened or not is controlled by controlling the pilot electromagnetic valve, whether the upper cavity of the main oil cylinder is decompressed or not is further controlled, the pilot electromagnetic valve can be controlled through a program, manual control is not needed, and the operation is simple and convenient. 3. After the pressure of the upper cavity of the main oil cylinder is relieved to a certain extent, the lower cavity of the main oil cylinder is automatically supplemented with oil, so that the pre-compression of the lower cavity of the main oil cylinder can be realized, the sinking phenomenon is effectively prevented, and the whole die opening process is stable. 4. The hydraulic control reversing valve detects the pressure of the pressure relief of the upper cavity of the main oil cylinder, so that the upper cavity of the main oil cylinder is subjected to pressure relief first, and after the pressure relief reaches a certain pressure, the second cartridge valve is controlled to be opened, so that the lower cavity of the main oil cylinder is supplemented, the oil feeding timing of the lower cavity of the main oil cylinder is automatically controlled, the oil feeding timing of the lower cavity is better, and the phenomenon that the piston of the main oil cylinder is impacted and vibrated too early by the oil feeding of the lower cavity and the sinking phenomenon caused by the too late oil feeding of the lower cavity can not occur. 5. The hydraulic control reversing valve is used as an executing element for switching the state of the second cartridge valve, and the state of the second cartridge valve is switched more timely, smooth and stable.
Preferably, as an improvement, the pilot electromagnetic valve comprises a first pilot electromagnetic valve and a second pilot electromagnetic valve, wherein the first pilot electromagnetic valve is a three-position four-way pilot electromagnetic valve, the second pilot electromagnetic valve is a two-position four-way pilot electromagnetic valve, the first pilot electromagnetic valve is connected with the second pilot electromagnetic valve, the first pilot electromagnetic valve is connected with the oil tank, and the first pilot electromagnetic valve is connected with the control cavity of the first cartridge valve; the second pilot electromagnetic valve is connected with the control cavity of the first cartridge valve.
Before pressure relief, the second pilot electromagnetic valve is in an open state in a normal state, external oil enters the control cavity of the first cartridge valve through the second pilot electromagnetic valve, the oil pressure of the control cavity of the first cartridge valve is large, and the first cartridge valve is in a closed state. When the pressure release begins, one end of a first pilot electromagnetic valve is powered on, the first pilot electromagnetic valve is communicated, part of oil entering from a second pilot electromagnetic valve flows to the first pilot electromagnetic valve, then the oil enters into an oil tank, so that the oil entering from the second pilot electromagnetic valve can not completely enter into a control cavity of a first cartridge valve, the oil pressure in the control cavity of the first cartridge valve can be relatively reduced, the first cartridge valve is opened, the oil in the upper cavity of a main oil cylinder is subjected to pressure release once through the first cartridge valve, and the pressure release speed is relatively slow because the opening degree of the first cartridge valve is smaller at the moment. After the pressure release time delay is finished once, the second pilot electromagnetic valve is electrified, the other end of the first pilot electromagnetic valve is electrified, hydraulic oil on the second pilot electromagnetic valve cannot flow to the control cavity of the first cartridge valve, oil inlet of the control cavity of the first cartridge valve is cut off, meanwhile, the control cavity of the first cartridge valve is further opened by the first pilot electromagnetic valve, oil in the control cavity of the first cartridge valve is rapidly discharged from the first pilot electromagnetic valve, namely the opening of the first cartridge valve is further increased, and the pressure of the upper cavity of the main oil cylinder is rapidly reduced. Therefore, through this scheme setting up first guide solenoid valve and second guide solenoid valve, two guide solenoid valves cooperation use, can control the aperture of first cartridge valve, realize the multistage regulation of pressure release speed, realized that the pressure release is slow earlier then fast, avoid the pressure release just to start the vibration that the speed is faster and bring, the process of whole pressure release can be more stable.
Preferably, as an improvement, the hydraulic control reversing valve comprises a first hydraulic control reversing valve and a second hydraulic control reversing valve, the first hydraulic control reversing valve is connected with the upper cavity of the main oil cylinder, and the first hydraulic control reversing valve is connected with the control cavity of the first cartridge valve; the second hydraulic control reversing valve is connected with the control cavity of the second cartridge valve, and the second hydraulic control reversing valve is connected with the upper cavity of the main oil cylinder.
When the oil pressure of the upper cavity of the main oil cylinder is reduced to the set pressure of the second hydraulic control reversing valve, the second hydraulic control reversing valve controls the second cartridge valve to be opened, oil in the upper cavity of the main oil cylinder is discharged into the lower cavity of the main oil cylinder, the lower cavity of the main oil cylinder is subjected to fluid supplementing pre-tightening, and at the moment, the sliding block and the die on the main oil cylinder start to open the die upwards under the pushing of the nitrogen cylinder. With the further reduction of the pressure of the upper cavity of the main oil cylinder, when the oil pressure of the upper cavity of the main oil cylinder is reduced to the set pressure of the first hydraulic control reversing valve, the first hydraulic control valve controls the valve port of the first cartridge valve to be fully opened, the hydraulic control valve rapidly ascends under the action of the nitrogen cylinder, meanwhile, oil in the upper cavity of the main oil cylinder is continuously fed into the lower cavity of the main oil cylinder for pressure pre-tightening, the phenomenon of sinking when the output of the nitrogen cylinder is insufficient is prevented, and redundant oil flowing out of the upper cavity of the main oil cylinder is discharged into an oil tank. Therefore, through the scheme, the second hydraulic control reversing valve automatically controls the automatic opening of the second cartridge valve according to the oil pressure of the upper cavity of the main oil cylinder. The first hydraulic control reversing valve realizes the detection of oil pressure in the upper cavity of the main oil cylinder, and can control the first cartridge valve to be further and completely opened, so that the quick return stroke of the later stage of the oil cylinder is realized, and the die opening efficiency is improved.
Preferably, as a modification, a one-way throttle valve is connected between the second pilot electromagnetic valve and the control chamber of the first cartridge valve.
Preferably, as a modification, an adjustable fluid group c is connected between the second pilot solenoid valve and the first pilot solenoid valve.
Preferably, as an improvement, the oil inlet of the second pilot electromagnetic valve is connected with an adjustable damping a.
Preferably, as an improvement, the oil inlet of the second pilot electromagnetic valve is connected with a one-way valve. Thereby realizing unidirectional flow of oil.
Drawings
Fig. 1 is a schematic diagram of a release-retarding oil circuit based on a passive die-opening condition of a press.
Detailed Description
The following is a further detailed description of the embodiments:
Reference numerals in the drawings of the specification include: the hydraulic control device comprises a first cartridge valve 1, a first pilot electromagnetic valve 2, a second pilot electromagnetic valve 3, a first hydraulic control reversing valve 4, a second hydraulic control reversing valve 5, an adjustable damping a 6, a one-way valve 7, a one-way throttle valve 8, an adjustable liquid group c 9, a second cartridge valve 11, a main oil cylinder 12, an upper die 13, a base 14, a nitrogen cylinder 15 and a lower die 16.
An example is substantially as shown in figure 1: a release-resistant oil way based on a press under a passive mold opening working condition comprises a main oil cylinder 12 and an oil tank. A slide block is fixed on the bottom end of a piston rod of the main oil cylinder 12 through a bolt, an upper die 13 is arranged below the slide block, a base 14 is arranged below the main oil cylinder 12, a lower die 16 is arranged on the base 14, and a nitrogen cylinder 15 is arranged on the lower die 16. The main cylinder 12 is internally provided with a piston, a cavity above the piston is an upper cavity, and a cavity below the piston is a lower cavity. The upper cavity of the main oil cylinder 12 is connected with an oil tank, a first cartridge valve 1 is arranged between the upper cavity of the main oil cylinder 12 and the oil tank, the right end of the first cartridge valve 1 is a control cavity, a spring and a piston are arranged in the control cavity of the first cartridge valve 1, and the spring is connected between the right end of the control cavity of the first cartridge valve 1 and the right side surface of the piston. A pilot electromagnetic valve is connected between the right end of the control cavity of the first cartridge valve 1 and the oil tank, the pilot electromagnetic valve comprises a first pilot electromagnetic valve 2 and a second pilot electromagnetic valve 3, the first pilot electromagnetic valve 2 is a three-position four-way pilot electromagnetic valve, the second pilot electromagnetic valve 3 is a two-position four-way pilot electromagnetic valve, as shown in the figure, the first pilot electromagnetic valve 2 is connected with the second pilot electromagnetic valve 3, the first pilot electromagnetic valve 2 is connected with the oil tank, and the first pilot electromagnetic valve 2 is connected with the right end of the control cavity of the first cartridge valve 1; both ends of the first pilot electromagnetic valve 2 can be electrified to generate magnetism, and the two ends are a YV2a end and a YV2b end respectively. The second pilot electromagnetic valve 3 is connected with the right end of the control cavity of the first cartridge valve 1.A one-way throttle valve 8 is connected between the second pilot electromagnetic valve 3 and the right end of the control cavity of the first cartridge valve 1. An adjustable liquid group c 9 is connected between the second pilot electromagnetic valve 3 and the first pilot electromagnetic valve 2. An oil inlet of the second pilot electromagnetic valve 3 is connected with an adjustable damping a6 and a one-way valve 7.
A second cartridge valve 11 is connected between the upper cavity of the main oil cylinder 12 and the lower cavity of the main oil cylinder 12, the lower end of the second cartridge valve 11 is a control cavity, and a spring is arranged in the control cavity at the lower end of the second cartridge valve 11. A hydraulic control reversing valve is connected between the bottom of the control cavity of the second cartridge valve 11 and the upper cavity of the main cylinder 12. The hydraulic control reversing valve in the embodiment comprises a first hydraulic control reversing valve 4 and a second hydraulic control reversing valve 5, wherein the first hydraulic control reversing valve 4 is connected with an upper cavity of a main oil cylinder 12 (external control incoming oil on the first hydraulic control reversing valve 4 is oil in the upper cavity of the main oil cylinder 12 in the figure), the first hydraulic control reversing valve 4 is connected with a control cavity of a first cartridge valve 1, and specifically, an upward oil way of the first hydraulic control reversing valve 4 is connected in a left cavity of a piston of the control cavity of the first cartridge valve 1; the second hydraulic control reversing valve 5 is connected with a control cavity of the second cartridge valve 11, and the second hydraulic control reversing valve 5 is connected with an upper cavity of the main oil cylinder 12.
The specific implementation process is as follows: after the master cylinder 12 drives the upper die 13 to press down the workpiece, the nitrogen cylinder 15 is in a compressed state, the first hydraulic control reversing valve 4 and the second hydraulic control reversing valve 5 are both in spring positions, and at the moment, the first cartridge valve 1 and the second cartridge valve 11 are both in a closed state. The second pilot electromagnetic valve 3 is in an open state in a normal state, external oil sequentially enters a control cavity of the first cartridge valve 1 through the one-way valve 7, the adjustable damping a6, the second pilot electromagnetic valve 3 and the one-way throttle valve 8, oil pressure in the control cavity of the first cartridge valve 1 is large, and the first cartridge valve 1 is in a closed state.
And then opening the mold. Firstly, the YV2a of the first pilot electromagnetic valve 2 is electrified, the first pilot electromagnetic valve 2 is opened, external oil enters the first electromagnetic valve along the one-way valve 7, the adjustable damping a 6 and the second pilot electromagnetic valve 3 and leaks into an oil tank, at the moment, the oil quantity entering a control cavity of the first cartridge valve 1 is reduced, the oil pressure in the control cavity of the first cartridge valve 1 is relatively reduced, the first cartridge valve 1 starts to be opened, the oil in the upper cavity of the main oil cylinder 12 is subjected to pressure relief once along a C-D oil path through the first cartridge valve 1, and the pressure relief speed is relatively slow.
After the first pressure relief delay, the YV1 end of the second pilot electromagnetic valve 3 and the YV2b end of the first pilot electromagnetic valve 2 are powered on, at this time, the oil entering the second pilot electromagnetic valve 3 is cut off and cannot flow towards the one-way throttle valve 8, the oil entering the control cavity of the first cartridge valve 1 is cut off, meanwhile, the first pilot electromagnetic valve 2 is in an opened state, the oil in the control cavity of the first cartridge valve 1 is rapidly discharged from the first pilot electromagnetic valve 2 to an oil tank, the oil pressure in the control cavity of the first cartridge valve 1 is reduced, the opening degree of the first cartridge valve 1 is further increased, and the pressure in the upper cavity of the main oil cylinder 12 is rapidly reduced.
When the oil pressure of the upper cavity of the main oil cylinder 12 is reduced to the set pressure of the second hydraulic control reversing valve 5, the second hydraulic control reversing valve 5 controls the second cartridge valve 11 to be opened, which is a gradual process, part of the oil in the upper cavity of the main oil cylinder 12 is discharged into the lower cavity of the main oil cylinder 12 along the C-E oil path, the lower cavity of the main oil cylinder 12 is subjected to fluid supplementing pre-tightening, and at the moment, the sliding block and the upper die 13 on the main oil cylinder 12 start to open the die upwards under the pushing of the nitrogen cylinder 15.
Along with the further reduction of the pressure of the upper cavity of the main oil cylinder 12, the first hydraulic control reversing valve 4 senses the reduction of the pressure of the upper cavity of the main oil cylinder 12, the spring of the first hydraulic control reversing valve 4 is reset, the first hydraulic control reversing valve 4 is opened, external control incoming oil directly enters into the left cavity of the piston of the control cavity of the first cartridge valve 1 through the first hydraulic control reversing valve 4, so that the piston of the control cavity of the first cartridge valve is pushed to move rightwards, at the moment, the valve port of the first cartridge valve 1 is fully opened, and the quantity of the oil in the upper cavity of the main oil cylinder 12 entering into an oil tank through the first cartridge valve 1 is increased. Meanwhile, under the action of the nitrogen cylinder 15, the piston of the main oil cylinder 12 rapidly ascends, and part of oil in the upper cavity of the main oil cylinder 12 is supplemented into the lower cavity of the main oil cylinder 12 to perform pressure pre-tightening, so that sinking is prevented when the output force of the nitrogen cylinder 15 is insufficient, and redundant oil is discharged into an oil tank.
In this embodiment, the stress analysis and the correlation equation at each stage are as follows:
decompression initial time: p 1*A1+Mg+f>(F0+KX)+P2*A2 ①;
Ejection time of nitrogen cylinder: p 1*A1+Mg+f≤(F0+KX)+P1*A2 ②;
the complete ejection moment of the nitrogen cylinder: mg+f is less than or equal to F 0+P2*A2 ③;
fast return time: mg+f is less than or equal to P 2*A2 ④;
From ②, when When the nitrogen cylinder starts to move upwards, the pressure value is not only the set value of the second hydraulic control reversing valve;
As can be seen from ③, the process,
As can be seen from ④, the process,
To achieve a fast response from the end of die opening to the return stroke, the lower cavity pressure is required to be changed to P 2 ", and as shown by Δv=β×Δp×v0, the smaller Δp is, the faster the response is (Δp is the main cylinder lower cavity pressure change value, Δv is the pumping flow), so that the efficiency is the highest when the pressure is changed from P2 to P 2", i.e. the return stroke efficiency is the highest when the nitrogen cylinder is not completely ejected in place, because the lower cavity "pre-tightening pressure" of the main cylinder is relatively large.
Wherein: p1-master cylinder upper chamber pressure;
P2-master cylinder lower chamber pressure;
a1, the area of a master cylinder plug cavity;
a2-master cylinder rod cavity area;
v0-master cylinder rod chamber volume;
f0-initial load of nitrogen cylinder;
K is the load-position change coefficient of the nitrogen cylinder;
x-nitrogen cylinder displacement (compression positive);
m is motion mass, slide block and upper mould mass;
beta-volume compression coefficient of oil;
f-friction force;
According to the analysis, the control mode of multistage pressure relief and lower cavity pre-tightening is introduced, so that the execution efficiency of an oil way can be improved.
The foregoing is merely exemplary of the present application, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, and these should also be regarded as the protection scope of the present application, which does not affect the effect of the implementation of the present application and the practical applicability of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (5)
1. The utility model provides a hinder and release oil circuit based on press under passive die sinking operating mode, includes master cylinder and oil tank, its characterized in that: a first cartridge valve is connected between the upper cavity of the main oil cylinder and the oil tank, a control cavity of the first cartridge valve is connected with a pilot electromagnetic valve, a second cartridge valve is connected between the upper cavity of the main oil cylinder and the lower cavity of the main oil cylinder, and a hydraulic control reversing valve is connected between the control cavity of the second cartridge valve and the upper cavity of the main oil cylinder;
The pilot electromagnetic valve comprises a first pilot electromagnetic valve and a second pilot electromagnetic valve, the first pilot electromagnetic valve is a three-position four-way pilot electromagnetic valve, the second pilot electromagnetic valve is a two-position four-way pilot electromagnetic valve, the first pilot electromagnetic valve comprises a A, B, T, P oil port, the second pilot electromagnetic valve comprises a A, B, T, P oil port, an A oil port of the first pilot electromagnetic valve is connected with an A oil port of the second pilot electromagnetic valve, an oil port of the first pilot electromagnetic valve T is connected with an oil outlet of the oil tank and the first cartridge valve, and an oil port of the first pilot electromagnetic valve B is connected with a right side chamber of a piston of a control cavity of the first cartridge valve; the oil port of the second pilot electromagnetic valve A is connected with a cavity on the right side of a piston of a control cavity of the first cartridge valve;
The hydraulic control reversing valve comprises a first hydraulic control reversing valve and a second hydraulic control reversing valve, the first hydraulic control reversing valve comprises a A, B, T, P oil port, the second hydraulic control reversing valve comprises a A, B, T, P oil port, and the first hydraulic control reversing valve A oil port is connected with a left side cavity of a control cavity piston of the first cartridge valve; the oil port of the second hydraulic control reversing valve A is connected with the control cavity of the second cartridge valve, the oil port of the second hydraulic control reversing valve P is connected with the upper cavity of the main oil cylinder, and the control cavities of the first hydraulic control reversing valve and the second hydraulic control reversing valve are both connected with the oil port P of the second pilot electromagnetic valve.
2. The release-retarding oil circuit based on the press passive mold opening working condition according to claim 1, wherein the release-retarding oil circuit is characterized in that: a one-way throttle valve is connected between the A oil port of the second pilot electromagnetic valve and a chamber on the right side of a piston of a control chamber of the first cartridge valve.
3. The release-retarding oil circuit based on the press passive mold opening working condition according to claim 1, wherein the release-retarding oil circuit is characterized in that: an adjustable liquid group c is connected between the oil port A of the second pilot electromagnetic valve and the oil port A of the first pilot electromagnetic valve.
4. The release-retarding oil circuit based on the press passive mold opening working condition according to claim 1, wherein the release-retarding oil circuit is characterized in that: and an oil inlet of the second pilot electromagnetic valve is connected with an adjustable damping a.
5. The release-retarding oil circuit based on the press passive mold opening working condition according to claim 1, wherein the release-retarding oil circuit is characterized in that: and the oil inlet of the second pilot electromagnetic valve is connected with a one-way valve.
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| CN202111363534.7A CN114087244B (en) | 2021-11-17 | 2021-11-17 | Release-resisting oil circuit based on passive die opening working condition of press |
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| CN202111363534.7A CN114087244B (en) | 2021-11-17 | 2021-11-17 | Release-resisting oil circuit based on passive die opening working condition of press |
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| CN116517905B (en) * | 2023-06-19 | 2024-08-23 | 江苏汇智高端工程机械创新中心有限公司 | Electrohydraulic reversing valve for override of hydraulic control |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201170219Y (en) * | 2008-02-20 | 2008-12-24 | 山东法因数控机械股份有限公司 | Punched hole power hydraulic system of flat plate sinker drill compound machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4524582A (en) * | 1983-03-31 | 1985-06-25 | Cincinnati Incorporated | Control system for hydraulic presses |
| CN107893784B (en) * | 2017-12-13 | 2023-12-05 | 安徽天水液压机床科技有限公司 | Hydraulic system of multi-cylinder linkage hydraulic machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201170219Y (en) * | 2008-02-20 | 2008-12-24 | 山东法因数控机械股份有限公司 | Punched hole power hydraulic system of flat plate sinker drill compound machine |
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