CN102941683A - Large-sized hydraulic machine pressure relief system - Google Patents
Large-sized hydraulic machine pressure relief system Download PDFInfo
- Publication number
- CN102941683A CN102941683A CN2012104638120A CN201210463812A CN102941683A CN 102941683 A CN102941683 A CN 102941683A CN 2012104638120 A CN2012104638120 A CN 2012104638120A CN 201210463812 A CN201210463812 A CN 201210463812A CN 102941683 A CN102941683 A CN 102941683A
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- Prior art keywords
- hydraulic cylinder
- main hydraulic
- valve
- pressure relief
- relief system
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Abstract
A large-sized hydraulic machine pressure relief system comprises a main hydraulic cylinder, a liquid charging valve, a liquid charging tank and an electromagnetic on-off valve, wherein the liquid charging valve is fixedly installed on the top of the main hydraulic cylinder, the liquid charging tank is connected with a piston cavity of the main hydraulic cylinder through the liquid charging valve, and the liquid charging tank is connected with the piston cavity of the main hydraulic cylinder through a pipeline for the electromagnetic on-off valve. The large-sized hydraulic machine pressure relief system can overcome the defect in the prior art that a pre-decompression valve core of the liquid charging valve can easily drop into a cylinder body of the main hydraulic cylinder to damage or seize the main hydraulic cylinder and has the advantage of reliability in work.
Description
Technical field
The present invention relates to hydraulic press, be specifically related to the pressure relief system of large hydraulic press, belong to the hydraulic press technical field.
Background technology
At present, the pressure relief system of large hydraulic press generally is by main hydraulic cylinder, prefill valve, and the topping up case forms, described prefill valve is fixed on the top of main hydraulic cylinder, the topping up case links to each other by prefill valve with the plunger shaft of main hydraulic cylinder, when hydraulic press is prepared backhaul at end-of-job, open in advance and let out in advance spool in the prefill valve, the pressure of main hydraulic cylinder epicoele is laid down at leisure, so that more steady during the hydraulic press backhaul, but, in the course of work of reality, because the initiation pressure of main hydraulic cylinder is generally larger, lets out in advance spool and bears larger compression shock in the moment of opening, and causes and lets out in advance coming off of spool, prefill valve can't be worked normally, also can be owing to pulling or stuck main hydraulic cylinder in the cylinder body of letting out in advance spool and fall into main hydraulic cylinder.
Summary of the invention
The object of the invention is to: for the existing defects of pressure relief system of existing large hydraulic press, the invention provides a kind of pressure relief system of novel large hydraulic press, overcome the existing existing defects of large hydraulic press pressure relief system.
The present invention realizes that the technical scheme that above-mentioned purpose adopts is: the pressure relief system of described large hydraulic press, it comprises: main hydraulic cylinder, prefill valve, topping up case, electromagnetism on-off valve, it is characterized in that: prefill valve is fixed on the top of main hydraulic cylinder, the topping up case links to each other by prefill valve with the plunger shaft of main hydraulic cylinder, and the topping up case links to each other with pipeline through the electromagnetism on-off valve with the plunger shaft of main hydraulic cylinder.
Beneficial effect: the present invention is because after adopting said method, when hydraulic press is prepared backhaul at end-of-job, the electromagnetism on-off valve is let out spool in advance prior to prefill valve, most pressure is laid down, guarantee that letting out in advance the suffered compression shock of spool reduces to minimum degree, so the present invention can overcome the spool of letting out in advance of prefill valve in the prior art and fall into easily in the cylinder body of main hydraulic cylinder and pull or the defective of stuck main hydraulic cylinder, has the advantage of reliable operation.
Description of drawings
Accompanying drawing is principle schematic of the present invention.
Shown in the figure: 1, main hydraulic cylinder; 2, prefill valve; 3, topping up case; 4, electromagnetism on-off valve.
The specific embodiment
The pressure relief system of large hydraulic press of the present invention, it comprises: main hydraulic cylinder (1), prefill valve (2), topping up case (3), electromagnetism on-off valve (4), it is characterized in that: prefill valve (2) is fixed on the top of main hydraulic cylinder (1), topping up case (3) links to each other by prefill valve (3) with the plunger shaft of main hydraulic cylinder (1), and topping up case (3) links to each other with pipeline through electromagnetism on-off valve (4) with the plunger shaft of main hydraulic cylinder (1).
Claims (1)
1. large hydraulic press pressure relief system, it is characterized in that: it comprises: main hydraulic cylinder (1), prefill valve (2), topping up case (3), electromagnetism on-off valve (4), it is characterized in that: prefill valve (2) is fixed on the top of main hydraulic cylinder (1), topping up case (3) links to each other by prefill valve (3) with the plunger shaft of main hydraulic cylinder (1), and topping up case (3) links to each other with pipeline through electromagnetism on-off valve (4) with the plunger shaft of main hydraulic cylinder (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN2012104638120A CN102941683A (en) | 2012-11-18 | 2012-11-18 | Large-sized hydraulic machine pressure relief system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN2012104638120A CN102941683A (en) | 2012-11-18 | 2012-11-18 | Large-sized hydraulic machine pressure relief system |
Publications (1)
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CN102941683A true CN102941683A (en) | 2013-02-27 |
Family
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Family Applications (1)
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CN2012104638120A Pending CN102941683A (en) | 2012-11-18 | 2012-11-18 | Large-sized hydraulic machine pressure relief system |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105478639A (en) * | 2014-09-16 | 2016-04-13 | 青岛德盛机械制造有限公司 | Thread roller and feeding control system thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3112393A1 (en) * | 1981-03-28 | 1982-10-14 | Hans 4240 Emmerich Feldhaus | Hydraulic press and its use in a method of manufacturing elements which are subjected to at least two different production operations |
TW201103743A (en) * | 2009-07-20 | 2011-02-01 | Index Automatic Technology Co Ltd | High-low pressure buffering system |
CN201960754U (en) * | 2010-12-21 | 2011-09-07 | 湖州机床厂有限公司 | Multi-cylinder conversion flexible control system for hydraulic machine |
CN202062696U (en) * | 2011-04-20 | 2011-12-07 | 徐州压力机械有限公司 | Pressure-releasing device for hydraulic-machine system |
CN102725135A (en) * | 2009-11-11 | 2012-10-10 | 贺尔碧格自动化技术控股股份有限公司 | Mechanical press |
-
2012
- 2012-11-18 CN CN2012104638120A patent/CN102941683A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3112393A1 (en) * | 1981-03-28 | 1982-10-14 | Hans 4240 Emmerich Feldhaus | Hydraulic press and its use in a method of manufacturing elements which are subjected to at least two different production operations |
TW201103743A (en) * | 2009-07-20 | 2011-02-01 | Index Automatic Technology Co Ltd | High-low pressure buffering system |
CN102725135A (en) * | 2009-11-11 | 2012-10-10 | 贺尔碧格自动化技术控股股份有限公司 | Mechanical press |
CN201960754U (en) * | 2010-12-21 | 2011-09-07 | 湖州机床厂有限公司 | Multi-cylinder conversion flexible control system for hydraulic machine |
CN202062696U (en) * | 2011-04-20 | 2011-12-07 | 徐州压力机械有限公司 | Pressure-releasing device for hydraulic-machine system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105478639A (en) * | 2014-09-16 | 2016-04-13 | 青岛德盛机械制造有限公司 | Thread roller and feeding control system thereof |
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Application publication date: 20130227 |