CN205101299U - Numerical control hydraulic pressure sheet material tubulation make -up machine hydraulic system - Google Patents
Numerical control hydraulic pressure sheet material tubulation make -up machine hydraulic system Download PDFInfo
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Abstract
The utility model discloses a numerical control hydraulic pressure sheet material tubulation make -up machine hydraulic system belongs to bender hydraulic system field. The oil inlet of this system's petroleum company of the people's republic of china pump passes through the pipeline to be connected with the oil tank, and the oil -out of oil pump passes through the oil inlet of tube coupling filter, and the oil -out of filter is organized through pressure control valve and is connected with the oil tank, tribit four way solenoid valve's the oil -out of P mouth and filter link to each other, a antilinear electromagnetism check valve is connected with the cavity of resorption of hydro -cylinder, the B mouth is connected with the epicoele of hydro -cylinder, the T mouth connects to the oil tank, your four way solenoid valve's the oil -out of P mouth and filter link to each other, the T mouth connects to the oil tank, the A mouth links to each other with the control port of hydraulically controlled check valve, the B mouth seals, the oil inlet of hydraulically controlled check valve connect to the oil tank, the oil -out is connected with the epicoele of hydro -cylinder. The utility model discloses the hydraulic component integrated level is high, compact structure, and synchronous precision is high, and with low costs, reliable and stable, and the anti unbalance loading of bender can the reinforce.
Description
Technical field
The utility model belongs to hydraulic control system of bender, more particularly, relates to a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system.
Background technique
Bender comprises support, worktable and clamping panel, and worktable is placed on support, and worktable is made up of base and pressing plate, base is connected with clamping panel by hinge, base is made up of seat shell, coil and cover plate, and coil is placed in the depression of a shell, and recessed top is covered with cover plate.During use by wire to coil electricity, after energising, gravitation is produced to pressing plate, thus realizes clamping to thin plate between pressing plate and base.Owing to have employed electromagnetic force clamping, make pressing plate can make various workpieces requirement, and can process having the workpiece of sidewall.
In actual use, often two independent numerical-control hydraulic sheet metal tubulation forming machines are bound up, be greater than bender separate unit bender width to the length of bending plate material to process, to this overlength plate of bending, it requires that two benders can synchronous coordination work.In order to meet above-mentioned requirements, to bender hydraulic system, there is very high requirement, its can complete fast under, work enters, pressurize, the working procedure such as to return to, also to ensure that two benders have high synchronization accuracy, require high to bender offset load resistance.
In prior art, the hydraulic system of a lot of bender simply can only reach work and enter and backhaul function, structure is comparatively simple, if China Patent Publication No. is CN102518613A, publication date is the patent documentation on June 27th, 2012, disclose a kind of bender hydraulic system, it comprises oil pump, fuel tank, three position four-way directional control valve, and liquid-filling valve is connected between fuel tank and cylinder upper cavity oil; The oil outlet of oil pump is through two-way plug-in valve connected tank; The P mouth of three position four-way directional control valve connects the oil outlet of oil pump, and B mouth connects oil cylinder cavity of resorption through the first solenoid directional control valve; B mouth also connects the control mouth of liquid-filling valve; The A mouth of three position four-way directional control valve connects cylinder upper cavity oil through throttling one-way valve; B mouth also connects oil cylinder cavity of resorption through the second solenoid directional control valve, throttle valve.
And for example China Patent Publication No. is CN103334971A, publication date is the patent documentation on October 2nd, 2013, disclose a kind of electric-hydraulic proportion numerical control bender hydraulic control system, it is communicated with No. second liquid-filling valve with number one liquid-filling valve respectively by the working hole of two-position four-way solenoid directional control valve, the working hole of three-position four-way electromagnetic directional valve is communicated with one end of damper, the working hole of three-position four-way electromagnetic directional valve is communicated with the oil outlet of sutaining valve, the oil outlet of electromagnet cut off valve is communicated with the filler opening of No. second one-way valve, number one liquid-filling valve is communicated with the plug chamber of No. second oil cylinder with number one oil cylinder respectively with the oil outlet of No. second liquid-filling valve, number one liquid-filling valve is communicated with fuel tank respectively with the filler opening of No. second liquid-filling valve.Program structure is comparatively simple, adoption rate cartridge valve, and external form volume is little, and working stability is reliable, without revealing, working efficiency is high, reduces equipment manufacturing cost, level of integration is high, the pressure of computer controlled system, is widely used in computer control numerical control bender hydraulic control system.
The hydraulic system of above-mentioned two kinds of benders, equal can realize fast under, work enters, release, backhaul four process, but they are relatively weak in system pressure maintaining performance, two connect numerical-control hydraulic sheet metal tubulation forming machines on complete machine synchronous synergetic ability and offset load resistance more weak, the stability of a system is not high, is further improved.
Summary of the invention
The problem that 1, will solve
The problem comparatively simple for existing bender hydraulic system controlling functions, offset load resistance is poor and the stability of a system is low, the utility model provides a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system, in this system, hydraulic element level of integration is high, compact structure, on bender install and pipe arrangement very convenient, offset load resistance is strong, and synchronization accuracy is high, and cost is low, power density ratio is high; This system can complete fast under, the process such as work enters, release and backhaul, complete function, and reliable and stable, and, highly versatile convenient to oil cylinder speeds control.
2, technological scheme
For solving the problem, the utility model adopts following technological scheme.
A kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system, comprise fuel tank, oil pump, filter, three position four-way electromagnetic valve, electromagnetism one-way valve, oil cylinder, Pilot operated check valve, two-position four-way solenoid valve and pressure controlled valve group, the filler opening of described oil pump is connected with fuel tank by pipeline, the oil outlet of oil pump connects the filler opening of filter by pipeline, the oil outlet of filter is connected with fuel tank through pressure controlled valve group; The P mouth of described three position four-way electromagnetic valve is connected with the oil outlet of filter, and A mouth is connected with the cavity of resorption of oil cylinder through electromagnetism one-way valve, and B mouth is connected with the epicoele of oil cylinder, and T mouth is connected to fuel tank; The P mouth of described two-position four-way solenoid valve is connected with the oil outlet of filter, and T mouth is connected to fuel tank, and A mouth is connected with the control port of Pilot operated check valve, and B mouth is closed; The filler opening of described Pilot operated check valve is connected to fuel tank, and oil outlet is connected with the epicoele of oil cylinder.
Further, described filter is the filter of band bypass valve.
Further, also comprise differential pressure switch, described pressure reduction quick closing valve is connected in parallel on the two ends of filter.
Further, described pressure controlled valve group comprises two-way plug-in valve, safety valve and proportional pressure valve; The filler opening of described two-way plug-in valve is connected with the oil outlet of filter, and the oil outlet of two-way plug-in valve is connected to fuel tank, and the control port of two-way plug-in valve is connected with fuel tank through proportional pressure valve; Described safety valve is connected in parallel on the two ends of proportional pressure valve.
Further, also comprise back pressure valve, described back pressure valve is connected in parallel on the two ends of electromagnetism one-way valve.
Further, also comprise relief valve, described relief valve is connected between the cavity of resorption of oil cylinder and fuel tank.
3, beneficial effect
Compared to prior art, the beneficial effects of the utility model are:
(1) a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present utility model, three position four-way electromagnetic valve adoption rate servovalve, the controllable openings of proportion of utilization servovalve controls oil cylinder speed, fluid in cylinder upper cavity oil (rodless cavity) can be passed in and out in fuel tank fast by Pilot operated check valve, therefore this hydraulic system oil cylinder speeds control convenience, highly versatile;
(2) a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present utility model, filter with bypass valve ensures the turbidity test of system fluid on the one hand, when filter blocks, bypass valve is opened and is ensured that oil-way system normally runs on the other hand, the differential pressure switch in parallel with filter sends alarm signal simultaneously, prompting needs more renew cartridge, prevents fluid conditions worsen;
(3) a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present utility model, the proportional pressure valve of pressure controlled valve group can regulate the working pressure of whole system, and safety valve setting pressure is greater than proportional pressure valve, ensures whole hydraulic system safety;
(4) a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present utility model, three position four-way electromagnetic valve, Pilot operated check valve, and electromagnetism one-way valve coordinates back pressure valve, realize oil cylinder fast under, work enters, pressurize and the process such as to return to, control accuracy is high, stability is strong, meanwhile, the relief valve between oil cylinder cavity of resorption and oil cylinder prevents oil cylinder cavity of resorption overpressure, ensures the Security of cylinder efficient;
(5) a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present utility model, the two-way plug-in valve of pressure controlled valve group, proportional pressure valve and safety valve and two-position four-way solenoid valve are integrated on a valve block, three position four-way electromagnetic valve, electromagnetism one-way valve, back pressure valve, relief valve and Pilot operated check valve are integrated on another valve block, whole system compact structure, pipeline is easy for installation, simplify system, reduce manufacture cost.
Accompanying drawing explanation
Fig. 1 is the hydraulic system principle figure of model utility;
Fig. 2 is the working state figure of each hydraulic element of the utility model;
In figure: 1, oil pump; 2, filter; 3, three position four-way electromagnetic valve; 4, electromagnetism one-way valve; 5, oil cylinder; 6, Pilot operated check valve; 7, two-position four-way solenoid valve; 8, two-way plug-in valve; 9, safety valve; 10, proportional pressure valve; 11, back pressure valve; 12, relief valve.
Embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system of the present embodiment, comprises fuel tank, oil pump 1, filter 2, differential pressure switch, three position four-way electromagnetic valve 3, electromagnetism one-way valve 4, oil cylinder 5, Pilot operated check valve 6, two-position four-way solenoid valve 7, back pressure valve 11, relief valve 12 and pressure controlled valve group.
Wherein, the filler opening of described oil pump 1 is connected with fuel tank by pipeline, and the oil outlet of oil pump 1 connects the filler opening of filter 2 by pipeline, in the present embodiment, this filter 2 is the filter of band bypass valve, pressure reduction quick closing valve is simultaneously connected in parallel on the two ends of filter 2, excessive in the liquid resistance of filter 2, when two ends pressure reduction is excessive, its bypass valve is opened, guarantee system fuel feeding is normal, and differential pressure switch sends alarm signal, reminds operator to change the filter core of filter 2 in time.
The P mouth of described three position four-way electromagnetic valve 3 is connected with the oil outlet of filter 2, and A mouth is connected through the cavity of resorption of electromagnetism one-way valve 4 with oil cylinder 5, and B mouth is connected with the epicoele of oil cylinder 5, and T mouth is connected to fuel tank.In the present embodiment, three position four-way electromagnetic valve 3 is electro-hydraulic proportion reversing valve, can by changing the input current of electromagnet, not only can change the working solution flow direction of valve, and the size that can control valve port realizes Flow-rate adjustment, namely there is commutation, there is again the complex function of throttling, greatly improve the control action of whole oil-way system.The P mouth of described two-position four-way solenoid valve 7 is connected with the oil outlet of filter 2, and T mouth is connected to fuel tank, and A mouth is connected with the control port of Pilot operated check valve 6, and B mouth is closed.The filler opening of described Pilot operated check valve 6 is connected to fuel tank, and oil outlet is connected with the epicoele of oil cylinder 5.When fast lower operation, Pilot operated check valve 6 forward is opened, and the fluid in fuel tank sucks the epicoele of oil cylinder 5, carries out supplementing of fluid; When returning to operation, Pilot operated check valve 6 is oppositely opened under oil circuit control effect, and the epicoele of oil cylinder 5 flows back to fuel tank, ensures oil cylinder 5 draining fast.In the present embodiment, described back pressure valve 11 is connected in parallel on the two ends of electromagnetism one-way valve 4, realizes the pressurize operation of system; Between the cavity of resorption that relief valve 12 is connected on oil cylinder 5 and fuel tank, the oil pressure relief larger than back pressure valve 11 10% of its setting, prevents the oil pressure of oil cylinder 5 cavity of resorption too high, ensures the stability that oil cylinder 5 works and Security.
Described pressure controlled valve group comprises two-way plug-in valve 8, safety valve 9 and proportional pressure valve 10, the filler opening of described two-way plug-in valve 8 is connected with the oil outlet of filter 2, the oil outlet of two-way plug-in valve 8 is connected to fuel tank, the control port of two-way plug-in valve 8 is connected with fuel tank through proportional pressure valve 10, described safety valve 9 is connected in parallel on the two ends of proportional pressure valve 10, proportional pressure valve 10 is used for the pressure of regulator solution pressing system, to meet the requirement of bending power, and the maximum pressure of safety valve 9 restriction system.
In the present embodiment, three position four-way electromagnetic valve 3 and filter 2, pipeline between two-position four-way solenoid valve 7 and filter 2 are respectively connected to an one-way valve, facilitate installation and the maintenance of hydraulic module.Also be connected to pressure gauge at the oil outlet of filter 2, the pressure condition of system can be understood at any time.
In the present embodiment, on three position four-way electromagnetic valve 3, two ends electromagnet represents with SPRO1 and SP01 respectively, and the electromagnet of electromagnetism one-way valve 4 is expressed as SO1, and the electromagnet of two-position four-way solenoid valve 7 represents with SO3, and the electromagnet of proportional pressure valve 10 is expressed as SPO3.Below the working procedure of system is described in detail.
1. under fast: the SPO3 voltage of proportional pressure valve 10 is at 20%-30%, the SO3 dead electricity of two-position four-way solenoid valve 7, the SPRO1 of three position four-way electromagnetic valve 3 obtains electric, the SO1 of electromagnetism one-way valve 4 obtains electric, fluid sucks the epicoele of oil cylinder 5 by Pilot operated check valve 6, and pressure oil enters the epicoele of oil cylinder 5 through three position four-way electromagnetic valve 3 in addition, and the fluid of oil cylinder 5 cavity of resorption gets back to fuel tank through electromagnetism one-way valve 4, three position four-way electromagnetic valve 3, the piston of oil cylinder 5 stretches out, and realizes fast lower operation.Speed under fast obtains by regulating the valve port opening of three position four-way electromagnetic valve 3.
2. work is entered: the SPO3 of proportional pressure valve 10 obtains electric, the SO3 dead electricity of two-position four-way solenoid valve 7, the SPRO1 of three position four-way electromagnetic valve 3 obtains electric, the SO1 dead electricity of electromagnetism one-way valve 4, fluid enters the epicoele of oil cylinder 5 through three position four-way electromagnetic valve 3, the fluid of oil cylinder 5 cavity of resorption is through back pressure valve 11 and three position four-way electromagnetic valve 3 oil sump tank, and the piston rod of oil cylinder 5 slowly stretches out, and the working pressure of oil cylinder 5 cavity of resorption is set by back pressure valve 11.Relief valve 12 prevents the oil pressure of oil cylinder 5 cavity of resorption too high, obtains different work speeds by regulating the valve port opening of three position four-way electromagnetic valve 3.
3. pressurize: when oil cylinder 5 arrives after bottom dead center, three position four-way electromagnetic valve 3 must not be electric, makes it remain on meta, thus cut off the path in the upper and lower chamber of oil cylinder 5, and the piston rod of oil cylinder 5 stays lower dead point position.
4. release: after bender pressurize terminates, the SPO3 of proportional pressure valve 10 obtains and electricly still keeps pressure, the SPO1 of three position four-way electromagnetic valve 3 is obtained certain voltage, three position four-way electromagnetic valve 3 trace is opened, the piston rod of oil cylinder 5 can be slowly up, Top Runby can adjust by regulating numerical control system parameter, and the unloading process time used is by decompression rate setting parameter.
5. return to: the SO3 of two-position four-way solenoid valve 7 obtains electric, the SPO1 of three position four-way electromagnetic valve 3 obtains electric, the SO1 dead electricity of electromagnetism one-way valve 4, Pilot operated check valve 6 is oppositely opened under the effect of control oil, pressure oil arrives oil cylinder 5 cavity of resorption through three position four-way electromagnetic valve 3, electromagnetism one-way valve 4, the fluid of oil cylinder 5 epicoele gets back to fuel tank through Pilot operated check valve 6, completes and returns to operation.Opening speed is also by regulating the valve port opening of three position four-way electromagnetic valve 3 to obtain.
In above-mentioned working procedure, the working state of each hydraulic element as shown in Figure 2.
Hydraulic element level of integration of the present utility model is high, compact structure, bender is installed and pipe arrangement very convenient, offset load resistance is strong, and cost is low, power density ratio is high; This system stability is reliable, highly versatile convenient to oil cylinder speeds control.
Schematically above be described the utility model and mode of execution thereof, this description does not have restricted, and also just one of the mode of execution of the present utility model shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the utility model and creating aim, design the mode of structure similar to this technological scheme and embodiment without creationary, protection domain of the present utility model all should be belonged to.
Claims (6)
1. a numerical-control hydraulic sheet metal tubulation molding machine hydraulic system, comprise fuel tank, oil pump (1), filter (2), three position four-way electromagnetic valve (3), electromagnetism one-way valve (4), oil cylinder (5), Pilot operated check valve (6), two-position four-way solenoid valve (7) and pressure controlled valve group, it is characterized in that: the filler opening of described oil pump (1) is connected with fuel tank by pipeline, the oil outlet of oil pump (1) connects the filler opening of filter (2) by pipeline, the oil outlet of filter (2) is connected with fuel tank through pressure controlled valve group; The P mouth of described three position four-way electromagnetic valve (3) is connected with the oil outlet of filter (2), A mouth is connected through the cavity of resorption of electromagnetism one-way valve (4) with oil cylinder (5), B mouth is connected with the epicoele of oil cylinder (5), and T mouth is connected to fuel tank; The P mouth of described two-position four-way solenoid valve (7) is connected with the oil outlet of filter (2), and T mouth is connected to fuel tank, and A mouth is connected with the control port of Pilot operated check valve (6), and B mouth is closed; The filler opening of described Pilot operated check valve (6) is connected to fuel tank, and oil outlet is connected with the epicoele of oil cylinder (5).
2. a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system according to claim 1, is characterized in that: described filter (2) is the filter of band bypass valve.
3. a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system according to claim 2, it is characterized in that: also comprise differential pressure switch, described differential pressure switch is connected in parallel on the two ends of filter (2).
4. a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system according to claim 1, is characterized in that: described pressure controlled valve group comprises two-way plug-in valve (8), safety valve (9) and proportional pressure valve (10); The filler opening of described two-way plug-in valve (8) is connected with the oil outlet of filter (2), the oil outlet of two-way plug-in valve (8) is connected to fuel tank, and the control port of two-way plug-in valve (8) is connected with fuel tank through proportional pressure valve (10); Described safety valve (9) is connected in parallel on the two ends of proportional pressure valve (10).
5. a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system according to claim 1, is characterized in that: also comprise back pressure valve (11), and described back pressure valve (11) is connected in parallel on the two ends of electromagnetism one-way valve (4).
6. a kind of numerical-control hydraulic sheet metal tubulation molding machine hydraulic system according to claim 5, is characterized in that: also comprise relief valve (12), between the cavity of resorption that described relief valve (12) is connected on oil cylinder (5) and fuel tank.
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| CN201520881810.2U CN205101299U (en) | 2015-11-03 | 2015-11-03 | Numerical control hydraulic pressure sheet material tubulation make -up machine hydraulic system |
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| CN105642710A (en) * | 2016-04-18 | 2016-06-08 | 江苏久日数控机床有限公司 | Servo dual-pump-control numerical control bending machine |
| CN105782154A (en) * | 2016-05-27 | 2016-07-20 | 桥弘数控科技（上海）有限公司 | Hydraulic machining machine, hydraulic system thereof and control method of hydraulic system |
| CN105909575A (en) * | 2016-06-28 | 2016-08-31 | 安徽东海机床制造有限公司 | Bending method of efficient bending machine |
| CN107745020A (en) * | 2017-11-16 | 2018-03-02 | 安徽德系重工科技有限公司 | A kind of hydraulic system of four-roller ripple veneer reeling machine |
| CN108626205A (en) * | 2018-04-13 | 2018-10-09 | 安徽天水液压机床科技有限公司 | A kind of multi-machine parallel connection numerical-control hydraulic sheet metal tubulation molding machine hydraulic system |
| CN109367094A (en) * | 2018-11-27 | 2019-02-22 | 安徽东海机床制造有限公司 | A kind of large-tonnage portal frame type hydraulic press |
| CN109654090A (en) * | 2019-01-04 | 2019-04-19 | 安徽天水液压机床科技有限公司 | A kind of application method of multi-machine parallel connection numerical-control hydraulic sheet metal tubulation molding machine |
| CN111207121A (en) * | 2020-02-27 | 2020-05-29 | 桥弘数控科技（上海）有限公司 | Servo hydraulic device and servo hydraulic bending machine |
| CN111503072A (en) * | 2020-04-10 | 2020-08-07 | 安徽东海机床制造有限公司 | Efficient numerical control bending machine hydraulic system and control method thereof |
| CN111608968A (en) * | 2020-06-02 | 2020-09-01 | 南京工程学院 | Electro-hydraulic proportional position synchronous control system for bending machine |
| CN113757201A (en) * | 2021-10-18 | 2021-12-07 | 山东泰丰智能控制股份有限公司 | Intelligent control hydraulic system |
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| CN105642710A (en) * | 2016-04-18 | 2016-06-08 | 江苏久日数控机床有限公司 | Servo dual-pump-control numerical control bending machine |
| CN105782154A (en) * | 2016-05-27 | 2016-07-20 | 桥弘数控科技（上海）有限公司 | Hydraulic machining machine, hydraulic system thereof and control method of hydraulic system |
| CN105909575A (en) * | 2016-06-28 | 2016-08-31 | 安徽东海机床制造有限公司 | Bending method of efficient bending machine |
| WO2018001388A1 (en) * | 2016-06-28 | 2018-01-04 | 安徽东海机床制造有限公司 | High-efficiency bending machine bending method |
| CN107745020B (en) * | 2017-11-16 | 2023-08-01 | 安徽德系重工科技有限公司 | Hydraulic system of four-roller corrugated plate bending machine |
| CN107745020A (en) * | 2017-11-16 | 2018-03-02 | 安徽德系重工科技有限公司 | A kind of hydraulic system of four-roller ripple veneer reeling machine |
| CN108626205A (en) * | 2018-04-13 | 2018-10-09 | 安徽天水液压机床科技有限公司 | A kind of multi-machine parallel connection numerical-control hydraulic sheet metal tubulation molding machine hydraulic system |
| CN109367094A (en) * | 2018-11-27 | 2019-02-22 | 安徽东海机床制造有限公司 | A kind of large-tonnage portal frame type hydraulic press |
| CN109367094B (en) * | 2018-11-27 | 2024-03-01 | 安徽东海机床制造有限公司 | Large-tonnage portal frame type oil press |
| CN109654090A (en) * | 2019-01-04 | 2019-04-19 | 安徽天水液压机床科技有限公司 | A kind of application method of multi-machine parallel connection numerical-control hydraulic sheet metal tubulation molding machine |
| CN111207121A (en) * | 2020-02-27 | 2020-05-29 | 桥弘数控科技（上海）有限公司 | Servo hydraulic device and servo hydraulic bending machine |
| CN111503072A (en) * | 2020-04-10 | 2020-08-07 | 安徽东海机床制造有限公司 | Efficient numerical control bending machine hydraulic system and control method thereof |
| CN111608968A (en) * | 2020-06-02 | 2020-09-01 | 南京工程学院 | Electro-hydraulic proportional position synchronous control system for bending machine |
| CN111608968B (en) * | 2020-06-02 | 2022-05-17 | 南京工程学院 | Electro-hydraulic proportional position synchronous control system for bending machine |
| CN113757201A (en) * | 2021-10-18 | 2021-12-07 | 山东泰丰智能控制股份有限公司 | Intelligent control hydraulic system |
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