CN102393332B - Hydraulic control system of balance cylinders in hydrostatic test - Google Patents
Hydraulic control system of balance cylinders in hydrostatic test Download PDFInfo
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- CN102393332B CN102393332B CN201110254790.2A CN201110254790A CN102393332B CN 102393332 B CN102393332 B CN 102393332B CN 201110254790 A CN201110254790 A CN 201110254790A CN 102393332 B CN102393332 B CN 102393332B
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Abstract
The invention discloses a hydraulic control system of balance cylinders in a hydrostatic test. The hydraulic control system comprises an oil tank, an oil pump, a proportional overflow valve, a main switch, a branch switch and the balance cylinders, wherein an inlet and an outlet of the oil pump are respectively communicated with the oil tank and an inlet of the main switch; the inlet of the main switch is also communicated with the oil tank through the proportional overflow valve; the balance cylinders are communicated with an outlet of the branch switch in parallel; an inlet of the branch switch is communicated with an outlet of the main switch; the balance cylinders are also communicated with a one-way channel which can be used for pumping oil from the oil tank; the proportional overflow valve is in communication connection with two pressure sensors; a test end of one pressure sensor is communicated with the inside of a welded tube to be tested; and a test end of the other pressure sensor is communicated with the outlet of the main switch. According to the hydraulic control system disclosed by the invention, a plurality of balance cylinders are grouped; and any one or several groups are selected and used according to actual requirement, and thereby the action areas of the balance cylinders can be effectively reduced and pre-sealing forces of the balance cylinders are reduced. In the hydraulic control system, the proportional overflow valve is not needed to be replaced and the ascending speed of the pressure of the balance cylinders cannot be reduced; and the operation process is simpler, quicker, safer and more reliable.
Description
Technical field
The present invention relates to tubulation unit, relate in particular to the control system of carrying out hydraulic balance in hydrostatic testing machine.
Background technology
Hydrostatic test is uniquely in welded tube production critical examination operation can check weldquality, can check again the comprehensive inspection process of mother metal quality.By hydrostatic test, can effectively find existing crackle on welded tube welding seam and mother metal, hole, current interruption, burn, the defect such as lack of penetration.
As shown in Figure 1, when carrying out hydrostatic test, welded tube 1 one end seals 7 by end and is communicated with water-filling head 6, on this water-filling head 6, be respectively arranged with low-pressure water import 8 and water under high pressure import 9, the other end of welded tube 1 seals 7 by end and leans rear pressure head 3, and pressure head feeding cylinder 5 feedings after rear pressure head 3 another sides rely on, rely on compensating cylinder 2 to carry out equalized pressure, compensating cylinder 2 comprises four 21,22,23,24 altogether, and layout as shown in Figure 2.Wherein, water-filling head 6 is stiff end, and rear pressure head 3 is mobile terminal.After the interior water-filling of welded tube 1, rear pressure head 3 is produced to thrust, the another side of rear pressure head 3 relies on the ejection of compensating cylinder 2 to carry out the pressure of the interior water of balance welded tube 1 to rear pressure head.On rear pressure head 3 another sides, be also connected with for the rear pressure head feeding cylinder 5 that in welded tube 1, after ejection, pressure head 3 and welded tube 1 do not carry out feeding during water-filling, totally 2, this rear pressure head feeding cylinder 5, is symmetrical arranged.
On the surface of contact of welded tube 1 and rear pressure head 3, bearing the thrust F of welded tube 1 inner high voltage water
waterthrust F with compensating cylinder 2
oil(as shown by the arrows in Figure 1), as long as meet F
water=KF
oil, i.e. P
oil* S
cylinder=KP
water* S
pipe, just can realize the mobile equilibrium of profit pressure, realize the inclusion seal of water under high pressure.Wherein, K is safety coefficient, should guarantee that K is slightly larger than 1 during practical operation.
The hydrostatic testing machine course of work is: compensating cylinder 2 applies certain pretightning force, cushion rubber Welded Pipe 1 both ends of the surface after utilizing on pressure head 3 seal, in welded tube 1, be full of afterwards low-pressure water and by the Bas Discharged in pipe, pressurize certain hour again after supercharging, then off-load, completes welded tube 1 hydrostatic test.In general, welded tube 1 diameter is larger, and wall thickness is larger, and grade of steel is higher, and desired hydrostatic testing machine performance is also just higher.In order to adapt to higher test pressure, conventionally usage ratio surplus valve is realized pressure tracking and is controlled, and the high test pressures of this proportional pressure control valve is generally set as 315bar, and correspondingly dead band (being minimum pressure) is 8bar.
But, because this minimum pressure is excessive, at present when thin-wall slim pipe is carried out to the hydraulic testing, in pre-sealed process, even if select above-mentioned minimum pressure, the pre-sealed power producing by compensating cylinder 2 also can be by butt-end packing 7 conquassation, even welded tube 1 is bent, the hydraulic testing cannot be carried out.For avoiding the generation of the problems referred to above, just must reduce the pre-sealed power of compensating cylinder 2.
The technology of existing reduction compensating cylinder 2 pre-sealed power comprises:
1, select the little proportional pressure control valve of the highest set pressure value.Although this method can reduce the minimum pressure of proportional pressure control valve, thereby reduce the pre-sealed power of compensating cylinder 2, but in order to meet the demand of balance water under high pressure pressure simultaneously, reduction amplitude can not be too large, and must change proportional pressure control valve according to product specification when pressure testing, affect production efficiency, increase workload and easily fluid polluted.
2, select the little oil pump of discharge capacity.Due to the minimum pressure of proportional pressure control valve along with flow reduce can reduce, so adopt the little oil pump of discharge capacity can realize the effect that reduces compensating cylinder 2 pre-sealed power.But the shortcoming of this method is in oil, water pressure tracking balance process, because flow system flow reduces, compensating cylinder 2 rate of pressure rise reduce, easily produce the problem that oil pressure is less than hydraulic pressure, this just easily causes seal failure, and water under high pressure ejection, even leads to major accident.
Summary of the invention
For problems of the prior art, object of the present invention is for providing a kind of can not lowering efficiency to increase workload, can not affect sealing effectiveness and can effectively reduce the hydraulic control system of balance cylinders in hydrostatic test of the pre-sealed power of compensating cylinder.
For achieving the above object, technical scheme of the present invention is as follows:
, comprising:
Fuel tank, oil pump, proportional pressure control valve, master switch, switch-dividing and compensating cylinder;
Described oil pump entrance is with outlet respectively by fuel tank and described master switch entrance described in pipeline connection, and described master switch entrance is also communicated with fuel tank by described proportional pressure control valve;
Described compensating cylinder exports by the described switch-dividing of pipeline connection in parallel, and described switch-dividing entrance exports by the described master switch of pipeline connection in parallel, and described compensating cylinder is also communicated with and can from described fuel tank, extracts the half-duplex channel of fluid;
Described proportional pressure control valve communication connects two pressure transducers, and it is inner that one of them pressure transducer test lead is communicated with welded tube to be measured, and another pressure transducer test lead is communicated with described master switch outlet.
Further, described master switch and switch-dividing are solenoid valve.
Further, in described half-duplex channel, be communicated with and be provided with prefill valve.
Beneficial effect of the present invention is, the present invention divides into groups a plurality of compensating cylinders, choice for use is any one group or several groups according to actual needs, thereby can effectively reduce compensating cylinder active area, reduce the pre-sealed power of compensating cylinder, use the present invention need not change proportional pressure control valve, also can not reduce compensating cylinder rate of pressure rise, operating process is simple and fast, safe and reliable more.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Fig. 1 is welded tube trystate structural representation in hydrostatic test;
Fig. 2 be in Fig. 1 A to structural representation;
Fig. 3 is hydraulic control system of balance cylinders in hydrostatic test hydraulic principle schematic diagram of the present invention.
Embodiment
The exemplary embodiments that embodies feature & benefits of the present invention will describe in detail in the following description.Be understood that the present invention can have various variations on different embodiment, its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing be when the use that explain in itself, but not in order to limit the present invention.
In the present invention, welded tube 1 each structure when carrying out hydrostatic test is all identical with prior art, as shown in Figure 1, and in background technology, has been explained in detail, and does not repeat them here.Fig. 2 shows the distribution of each compensating cylinder 2 in the present embodiment, in the present embodiment, have 21,22,23 and 24, four compensating cylinders of four compensating cylinders 21,22,23,24 and form annular arrays, and centered by welded tube 1 axes extending line line.
As shown in Figure 3, the present invention includes fuel tank 11, oil pump 12, proportional pressure control valve 13, master switch 14, switch-dividing 15 and compensating cylinder 2.Wherein, in fuel tank 11, fill fluid, for each Hydraulic Elements provide fluid.Oil pump 12 is connected with motor 16, and under this motor 16 drives rotation work, oil pump 12 entrances are by pipeline connection fuel tank 11, oil pump 12 outlets are by pipeline connection master switch 14.In this path, be also communicated with and be provided with filtrator 10 and pollute signalling generator 19, filtrator 10, for filtering fluid, pollutes signalling generator 19 at oil contamination alarm, guarantees the cleanliness of system fluid.Master switch 14 is gone back passing ratio surplus valve 13 and is communicated with fuel tank 11.
Proportional pressure control valve 13 can be realized pressure proportional and control, and proportional pressure control valve 13 communications are connected with two pressure transducers 17,18, and one of them pressure transducer 17 test lead is communicated with welded tube to be measured 1 inside, the interior hydraulic pressure of test welded tube 1; Another pressure transducer 18 test leads are communicated with described master switch 14 outlets, test this outlet oil pressure.Proportional pressure control valve 13 passing ratios are controlled, and control above-mentioned oil pressure with above-mentioned water pressure lifting, and all the time a little more than this hydraulic pressure, guarantee the reliable of rear joint 3 sealings of welded tube 1.
In the present embodiment, four compensating cylinders 2 are divided into two groups: 21 and 22 1 groups, 23 and 24 1 groups, between every group (21,22 and 23,24), be arranged in parallel, two compensating cylinders (21 and 22 in every group, 23 and 24) between, be also arranged in parallel, piston rod 20 front ends of each compensating cylinder 2 are fixedly connected with rear pressure head 3.Two compensating cylinder 2 oil-ins in every group are all by 15 outlets of pipeline connection switch-dividing, and two switch-dividing 15 entrances export by the pipeline master switch 14 that is communicated with in parallel again, have just realized being arranged in parallel of four compensating cylinders 21,22,23,24.These four compensating cylinders, 21,22,23,24 groupings arrange, and each group is controlled respectively break-make by switch-dividing 15, according to actual needs one group of choice for use or two groups of compensating cylinders 2.The layout of every group of compensating cylinder 2 as shown in Figure 2, is and is symmetrical arranged, and axis of symmetry is the center line of welded tube 1.Switch-dividing 15 is the same with master switch 14, can adopt hand switch form, also can adopt motor operated switch, and in the present embodiment, this switch-dividing 15 adopts two-position two-way solenoid valve, adopts this solenoid valve controllability better, is also convenient to realize automatic control.
Compensating cylinder 2 entrances are also communicated with separately half-duplex channel 4, this half-duplex channel 4 can extract fluid from fuel tank 11, this half-duplex channel 4 arranges prefill valve 41 by connection and realizes, in this prefill valve 41, contain one-way valve structures, guarantee that fluid can only enter compensating cylinder 2 from this half-duplex channel 4, and can not oppositely flow out from this half-duplex channel 4.In the present embodiment, prefill valve 41 has two, and each prefill valve 41 is communicated with one group of (2) compensating cylinder 2, convenient grouping topping up.Prefill valve 41 is also communicated with auxiliary oil way, can by this auxiliary oil way, control the reverse unlatching of prefill valve, makes the anti-oil return case 11 that fills of compensating cylinder fluid when rollback.This auxiliary oil way can by with other oil circuits be communicated with realize, also can arrange separately.
Beneficial effect of the present invention is, the present invention is divided into two groups by four each and every one compensating cylinders 21,22,23,24, choice for use is any one group or two groups according to actual needs, thereby compensating cylinder 2 resultant action areas can be reduced to half, reduce the pre-sealed power of half compensating cylinder 2, use the present invention need not change proportional pressure control valve 13, also can not reduce compensating cylinder 2 rate of pressure rise, operating process is simple and fast, safe and reliable more.
When thin-wall long and thin welded tube 1 is carried out to the hydraulic testing, after rear pressure head feeding cylinder 5 stretches out and promotes, pressure head 3 advances, and compensating cylinder 2 is oil-filled fast by prefill valve 41, until welded tube 1 front end is run into water-filling head 6, rear pressure head feeding cylinder 5 internal pressures increase, and halt.Oil pump 12 is opened, in the two-position two-way solenoid valve 15 (being switch-dividing) of two-position three way magnetic valve 14 (being master switch) and control compensating cylinder 2, one obtains electric, in four compensating cylinders 21,22,23,24 any one group 21 and 22 or 23 and 24 by oil pump input pressure fluid, the minimum pressure Welded Pipe 1 of proportion of utilization surplus valve 13 is implemented pre-sealed simultaneously, at this moment pre-sealed power is the pressure area product of 2 times, i.e. 2P π D
2/ 4 (minimum pressure that wherein P is proportional pressure control valve, the piston diameters that D is compensating cylinder).Then in welded tube 1, fill low-pressure water, after water is full, open high pressure filling valve and open profit pressure equilibrium automatic tracking system simultaneously, until water under high pressure reaches the pressure of testing requirements, stop pressurization, after time pressurize in accordance with regulations, open water under high pressure unloader, compensating cylinder 2 is return, and completes hydrostatic test.
When high standard welded tube 1 is carried out to the hydraulic testing, after rear pressure head feeding cylinder 5 stretches out and promotes, pressure head 3 advances, and compensating cylinder 2 is oil-filled fast by prefill valve 4, until welded tube 1 front end is run into water-filling head 6, rear pressure head feeding cylinder 5 internal pressures increase, and halt.Oil pump 12 is opened, two-position three way magnetic valve 14 (being master switch) and two two-position two-way solenoid valves 15 (being switch-dividing) of controlling 4 compensating cylinders all electric, four compensating cylinders 21,22,23,24 are all worked, the minimum pressure Welded Pipe 1 of proportion of utilization surplus valve 13 is implemented pre-sealed simultaneously, at this moment pre-sealed power is the pressure area product of 4 times, i.e. 4P π D
2/ 4 (minimum pressure that wherein P is proportional pressure control valve, the piston diameters that D is compensating cylinder).Then in welded tube 1, fill low-pressure water, after water is full, open high pressure filling valve and open profit pressure equilibrium automatic tracking system simultaneously, until water under high pressure reaches the pressure of testing requirements, stop pressurization, after time pressurize in accordance with regulations, open water under high pressure unloader, compensating cylinder 2 is return, and completes the hydraulic testing.
Technical scheme of the present invention is disclosed as above by preferred embodiment.Those skilled in the art should recognize in the situation that do not depart from change and the retouching that scope and spirit of the present invention that the appended claim of the present invention discloses are done, within all belonging to the protection domain of claim of the present invention.
Claims (3)
1. a hydraulic control system of balance cylinders in hydrostatic test, is characterized in that, comprising:
Fuel tank, oil pump, proportional pressure control valve, master switch, two switch-dividings and four compensating cylinders;
Described oil pump entrance is with outlet respectively by fuel tank and described master switch entrance described in pipeline connection, and described master switch entrance is also communicated with fuel tank by described proportional pressure control valve;
Two of described four compensating cylinders are that a component is two groups, the pouring orifice of two compensating cylinders of every group of compensating cylinder exports by one of them switch-dividing of pipeline connection, described two switch-dividing entrances export by master switch described in pipeline connection, by one group of described switch-dividing choice for use or two groups of compensating cylinders, the piston rod front end of each compensating cylinder is fixedly connected with rear pressure head, and the pouring orifice of two compensating cylinders of described every group of compensating cylinder is also communicated with and can from described fuel tank, extracts the half-duplex channel of fluid;
Described proportional pressure control valve communication connects two pressure transducers, and one of them pressure transducer test lead is communicated with the welded tube to be measured inside of hydrostatic test, and another pressure transducer test lead is communicated with described master switch outlet.
2. hydraulic control system of balance cylinders in hydrostatic test as claimed in claim 1, is characterized in that, described master switch and switch-dividing are solenoid valve.
3. hydraulic control system of balance cylinders in hydrostatic test as claimed in claim 1, is characterized in that, in described half-duplex channel, is communicated with and is provided with prefill valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254790.2A CN102393332B (en) | 2011-08-31 | 2011-08-31 | Hydraulic control system of balance cylinders in hydrostatic test |
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|---|---|---|---|
| CN201110254790.2A CN102393332B (en) | 2011-08-31 | 2011-08-31 | Hydraulic control system of balance cylinders in hydrostatic test |
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| CN102393332A CN102393332A (en) | 2012-03-28 |
| CN102393332B true CN102393332B (en) | 2014-01-29 |
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| CN103062143B (en) * | 2012-12-31 | 2015-12-23 | 太原重工股份有限公司 | A kind of hydraulic control system and hydrostatic test steel pipe machine oil-water balance system |
| CN107065954A (en) * | 2017-06-19 | 2017-08-18 | 大连海事大学 | A kind of deepwater high-pressure analogue means |
Citations (4)
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|---|---|---|---|---|
| CN2196299Y (en) * | 1993-12-31 | 1995-05-03 | 抚顺机械厂 | Pressure tester |
| EP1447483A2 (en) * | 1996-06-11 | 2004-08-18 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive system |
| CN201376351Y (en) * | 2008-12-14 | 2010-01-06 | 天水锻压机床有限公司 | Large-tonnage hydraulic press normal position pressure following system |
| CN201828418U (en) * | 2010-09-29 | 2011-05-11 | 上海高压油泵厂有限公司 | Hydraulic test system for horizontal dual-cylinder hydraulic machine |
-
2011
- 2011-08-31 CN CN201110254790.2A patent/CN102393332B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2196299Y (en) * | 1993-12-31 | 1995-05-03 | 抚顺机械厂 | Pressure tester |
| EP1447483A2 (en) * | 1996-06-11 | 2004-08-18 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive system |
| CN201376351Y (en) * | 2008-12-14 | 2010-01-06 | 天水锻压机床有限公司 | Large-tonnage hydraulic press normal position pressure following system |
| CN201828418U (en) * | 2010-09-29 | 2011-05-11 | 上海高压油泵厂有限公司 | Hydraulic test system for horizontal dual-cylinder hydraulic machine |
Non-Patent Citations (2)
| Title |
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| 焊管水压试验增压补进水计算和高压水系统设计;陈英莲 等;《焊管》;20080131;第31卷(第1期);第57-60页 * |
| 陈英莲 等.焊管水压试验增压补进水计算和高压水系统设计.《焊管》.2008,第31卷(第1期), |
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