CN201376351Y - Large-tonnage hydraulic press normal position pressure following system - Google Patents
Large-tonnage hydraulic press normal position pressure following system Download PDFInfo
- Publication number
- CN201376351Y CN201376351Y CN200820230092U CN200820230092U CN201376351Y CN 201376351 Y CN201376351 Y CN 201376351Y CN 200820230092 U CN200820230092 U CN 200820230092U CN 200820230092 U CN200820230092 U CN 200820230092U CN 201376351 Y CN201376351 Y CN 201376351Y
- Authority
- CN
- China
- Prior art keywords
- pressure
- oil
- relief valve
- valve
- pressure sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a large-tonnage hydraulic press normal position pressure following system, comprising a main oil cylinder oil inlet pipeline, a proportional relief valve and a safe valve. The main oil cylinder oil inlet pipeline consists of a high pressure oil filter and a one-way valve. The proportional relief valve and the safe valve are respectively connected with the main oil cylinder oil inlet pipeline. The oil inlet of the main oil cylinder is provided with an oil pressure sensor. The high-pressure water inlet of a steel pipe is provided with a water pressure sensor. The utility model is characterized in that the electromagnetic relief valve with small oil return resistance is connected in parallel beside the proportional relief valve. The oil pressure sensor, the water pressure sensor, the electromagnetic relief valve and the proportional relief valve are electrically connected with a programmable controller PLC and an open loop control loop is formed. The utility model reduces the initial pressure decompression of the dead zone return pressure of the proportional relief valve on the main coil cylinder and solves the problem that when the large-tonnage hydraulic press is applied to a small-sized thin-wall steel pipe, the steel pipe is bent and an end water sealing ring is cut off in the prior art. The utility model saves the cost, reduces the times of changing the sealing ring and improves the production efficiency.
Description
Technical field
The utility model belongs to the capital equipment control system of tubulation industry, is specifically related to a kind of hydraulic pressure system for tracking to the initial water shutoff hydraulic pressure of large-tonnage steel pipe hydrostatic testing machine.
Background technology
Steel pipe hydraulic press in the past since large straight-line joint submerged arc welding tube comes out, has required more and more higher to the tonnage and the test pressure of hydraulic press all in 2500 tons.Expansion along with tubulation industry production scope (φ 406mm～φ 1422mm), the tonnage and the test pressure of hydraulic press master cylinder have also been strengthened, but the large-tonnage hydraulic press shows deficiency in the pressure testing process of small dimension thin-wall steel tube, master cylinder has just begun monitoring to be followed the tracks of, the blind area return pressure (1MPa) of its percentage of import overflow valve acts on master cylinder (159 tons of strength), make tested compressed steel pipe body otherwise be bent, the seal water-sealing circle of steel tube head is cut off, the water pressure test can't be carried out, and this sealing ring cost that is used for steel pipe hydraulic pressure is high, change once also that the utmost point is not easy, seriously restricted production efficiency.
Summary of the invention
The purpose of this utility model is to provide a kind of and not only had been applicable to the small dimension thin-walled, but also can satisfy the large-tonnage hydraulic press original position pressure follow system of the big specification thick walled steel tube water pressure test.
To achieve these goals, the technical scheme taked of the utility model is:
A kind of large-tonnage hydraulic press original position pressure follow system, comprise the master cylinder in-line of forming by high-pressure filter and check valve, and proportional pressure control valve in parallel with the master cylinder in-line respectively and safety valve, the oil-in of master cylinder is provided with the oil pressure pressure sensor, the water under high pressure import department of steel pipe is provided with the hydraulic pressure pressure sensor, it is characterized in that: described proportional pressure control valve next door electromagnetic relief valve that the oil return resistance is very little in parallel, described oil pressure pressure sensor, the hydraulic pressure pressure sensor, electromagnetic relief valve and proportional pressure control valve all are electrically connected with Programmable Logic Controller PLC, constitute an open loop control loop.
The oil inlet end of described electromagnetic relief valve is connected between the high-pressure filter and check valve in the in-line, and its oil revolving end is connected with fuel tank.
When described electromagnetic relief valve was 1MPa when the oil return blind area of proportional pressure control valve force value, its return pressure value was 0.3MPa.
The above-mentioned large-tonnage hydraulic press original position pressure follow system that the utility model provides, because electromagnetic relief valve that the oil return resistance is very little in parallel on proportional pressure control valve next door, the blind area return pressure of proportional pressure control valve can be acted on the initial pressure off-load reduction of master cylinder, make the initial pressure of master cylinder be not enough to the seal water-sealing circle of steel pipe and termination thereof is caused damage, thereby solved when the large-tonnage hydraulic press is used for the small dimension thin-wall steel tube in the prior art, the steel pipe that occurs is bent and the cut problem of termination seal water-sealing circle, greatly provide cost savings, and reduced the number of times of changing sealing ring, improved production efficiency.
Description of drawings
Fig. 1 is a hydraulic principle schematic diagram of the present utility model
Among the figure: the 1-high-pressure filter; The 2-check valve; The 3-electromagnetic relief valve; The 4-high-pressure filter; The 5-proportional pressure control valve; The 6-safety valve; 7-oil pressure pressure sensor; 8-hydraulic pressure pressure sensor; The 9-master cylinder; The 10-side cylinder; The 11-water under high pressure; The 12-low-pressure water; The 13-fuel tank; The 14-steel pipe; 15-seal water-sealing circle.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further elaborated:
As shown in Figure 1, in the large-tonnage hydraulic press original position pressure follow system embodiment that the utility model provides, comprise the in-line of the master cylinder of forming by oil pump, high-pressure filter 1 and the check valve 2 of motor M 1 drive 9; And proportional pressure control valve 5 and safety valve 6 in parallel with the in-line of master cylinder 9 respectively, wherein proportional pressure control valve 5 serial connection high-pressure filters 4; The oil-in of master cylinder 9 is provided with oil pressure pressure sensor 7, and the import department of the water under high pressure 11 of steel pipe is provided with hydraulic pressure pressure sensor 8; Hydraulic pressure pressure sensor 8 is set with the hydraulic pressure value of following in advance; For avoiding the too high initial pressure (1MPa) of master cylinder 9, the body of steel pipe 14, the seal water-sealing circle 15 of steel tube head are caused damage, so in the parallel connection of the next door of proportional pressure control valve 5 electromagnetic relief valve 3 of an oil return resistance very little (0.3MPa), the oil inlet end that is about to electromagnetic relief valve 3 is connected between in-line mesohigh oil filter 1 and the check valve 2, and its oil revolving end takes back fuel tank 13.
When side cylinder 101,102 drives the tested compressed steel pipe 14 of master cylinder 9 first pretensions, high and low setting-out 11,12 begins to inject steel pipe 14, this moment, proportional pressure control valve 5 and oil pressure pressure sensor 7 began to monitor the detected value of hydraulic pressure pressure sensor 8, but because electromagnetic relief valve 3 is not charged all the time, just 0.3MPa is arrived in the 1MPa oil pressure off-load of proportional pressure control valve 5, this just makes the initial pressure of master cylinder be not enough to steel pipe 14 and termination seal water-sealing circle 15 are caused damage.After the water in the steel pipe 14 is filled with, water under high pressure 11 begins pressurization, when hydraulic pressure pressure sensor 8 detects hydraulic pressure and reaches predefined a certain value (hydraulic pressure is followed a little), feed back to Programmable Logic Controller PLC, at this moment, electromagnetic relief valve 3 is charged, and oil pressure moment of master cylinder 9 is raised to 1MPa by 0.3MPa, but be full of the water under high pressure that reaches certain pressure in the invar pipe 14, so the oil pressure that master cylinder 9 produces can be not again the seal water-sealing circle 15 of steel pipe 14 and termination thereof is caused damage.When hydraulic pressure continues to rise, oil pressure pressure sensor 7 is followed the tracks of the signal that hydraulic pressure pressure sensor 8 feeds back among the Programmable Logic Controller PLC, Programmable Logic Controller PLC provides voltage signal for proportional pressure control valve 5, proportional pressure control valve 5 is by the coefficient supercharging of setting thereupon, oil pressure and hydraulic pressure are alternately risen, finish the water pressure test of steel pipe.
Above-described only is preferred embodiment of the present utility model.Should be understood that for the person of ordinary skill of the art, under technology enlightenment provided by the utility model, can also make other equivalent modifications and improvement, also should be considered as protection domain of the present utility model.
Claims (2)
1. large-tonnage hydraulic press original position pressure follow system, comprise the master cylinder in-line of forming by high-pressure filter and check valve, and proportional pressure control valve in parallel with the master cylinder in-line respectively and safety valve, the oil-in of master cylinder is provided with the oil pressure pressure sensor, the water under high pressure import department of steel pipe is provided with the hydraulic pressure pressure sensor, it is characterized in that: described proportional pressure control valve next door electromagnetic relief valve in parallel, described oil pressure pressure sensor, the hydraulic pressure pressure sensor, electromagnetic relief valve and proportional pressure control valve all are electrically connected with Programmable Logic Controller PLC, constitute an open loop control loop.
2. large-tonnage hydraulic press original position pressure follow according to claim 1 system, the oil inlet end that it is characterized in that described electromagnetic relief valve is connected between the high-pressure filter and check valve in the in-line, and its oil revolving end is connected with fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820230092U CN201376351Y (en) | 2008-12-14 | 2008-12-14 | Large-tonnage hydraulic press normal position pressure following system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820230092U CN201376351Y (en) | 2008-12-14 | 2008-12-14 | Large-tonnage hydraulic press normal position pressure following system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201376351Y true CN201376351Y (en) | 2010-01-06 |
Family
ID=41516449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820230092U Expired - Fee Related CN201376351Y (en) | 2008-12-14 | 2008-12-14 | Large-tonnage hydraulic press normal position pressure following system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201376351Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393332A (en) * | 2011-08-31 | 2012-03-28 | 太原重工股份有限公司 | Hydraulic control system of balance cylinders in hydrostatic test |
| CN106734497A (en) * | 2017-02-24 | 2017-05-31 | 中国重型机械研究院股份公司 | A kind of automatic following balances pressure endless drive and application process |
-
2008
- 2008-12-14 CN CN200820230092U patent/CN201376351Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393332A (en) * | 2011-08-31 | 2012-03-28 | 太原重工股份有限公司 | Hydraulic control system of balance cylinders in hydrostatic test |
| CN102393332B (en) * | 2011-08-31 | 2014-01-29 | 太原重工股份有限公司 | Hydraulic control system of balance cylinders in hydrostatic test |
| CN106734497A (en) * | 2017-02-24 | 2017-05-31 | 中国重型机械研究院股份公司 | A kind of automatic following balances pressure endless drive and application process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201442827U (en) | Ultra-thin hydraulic lifter hydraulic system | |
| CN108222983A (en) | A kind of column boost-up circuit of hydraulic support | |
| CN111272414A (en) | High-pressure valve life test device | |
| CN201376351Y (en) | Large-tonnage hydraulic press normal position pressure following system | |
| CN202028627U (en) | Three-way pipe extrusion molding device | |
| CN108638568B (en) | Energy-saving hydraulic cushion control system for hydraulic machine | |
| CN208024377U (en) | A kind of column boost-up circuit of hydraulic support | |
| CN104865132A (en) | Internal-pulling type ultrahigh-pressure hydraulic pressure testing machine for large-diameter steel pipe and hydraulic system of hydraulic pressure testing machine | |
| CN104961194A (en) | Reverse osmosis desalination system energy recovery and recycle device and use method thereof | |
| CN2879169Y (en) | New pressure testing device | |
| CN205992179U (en) | A kind of supertension pressure testing system | |
| CN101514948A (en) | Quick pressurization system for steel pipe hydrostatic tester | |
| CN205721408U (en) | Pressure-air demolition set tele-control system | |
| CN103867507B (en) | A kind of device of the tested hydraulic system offer load being oil cylinder for outfan | |
| CN205298094U (en) | Automatic continuous single -shot booster | |
| CN204556177U (en) | Gas cylinder steam mixing pressure testing machine | |
| CN204420563U (en) | Gas-pressed equipment | |
| CN201632927U (en) | Leak-tightness device on horizontal type steel ball flashing machine | |
| CN213870487U (en) | Long-time pressurizer of hydraulic press | |
| CN203809385U (en) | Device for providing loads for tested hydraulic system with oil cylinder as output end | |
| CN203809418U (en) | Hydraulic oil cylinder testing system | |
| CN202117558U (en) | Closed hydraulic system of gear rack drilling machine | |
| CN201136302Y (en) | Constant pressure compensating mechanism for oil press | |
| CN107355453B (en) | Rubbish compressor hydraulic system with fault detection and fault detection method | |
| CN217976790U (en) | Hydraulic system of diffusion welding equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20101214 |