CN103821148B - Closed continuous quadratic adds water wet shotcreting system - Google Patents

Closed continuous quadratic adds water wet shotcreting system Download PDF

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Publication number
CN103821148B
CN103821148B CN201410064227.2A CN201410064227A CN103821148B CN 103821148 B CN103821148 B CN 103821148B CN 201410064227 A CN201410064227 A CN 201410064227A CN 103821148 B CN103821148 B CN 103821148B
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China
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water
accelerating agent
liquid accelerating
screw rod
shower nozzle
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Expired - Fee Related
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CN201410064227.2A
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CN103821148A (en
Inventor
张露晨
李树忱
李术才
徐咸辉
马腾飞
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Shandong University
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Shandong University
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Abstract

The invention discloses a kind of closed continuous quadratic to add water wet shotcreting system, comprise injection apparatus, screw rod feeding device, liquid accelerating agent feed system, shower nozzle mixing arrangement and skeleton symbol manipulator.The feeding mouth of injection apparatus and the outlet of screw rod feeding device, injection apparatus also exports with shower nozzle mixing arrangement and is connected, and the entrance of described shower nozzle mixing arrangement connects the mixture of water and liquid accelerating agent.Liquid accelerating agent is supplied by liquid accelerating agent feedway, and the output of liquid accelerating agent feedway connects an input of a three-way device, and another input of three-way device connects water under high pressure; The output of three-way device connects the input of shower nozzle mixing arrangement, and is provided with water valve on its connecting line.The present invention is mainly short of for the application of current wet-spray technique, a kind of Novel wet pressure spray process of proposition, on the basis of original tide spray, reaches the effect of wet shot, controllable, reduces the springback capacity in sprayed construction and Dust Capacity.

Description

Closed continuous quadratic adds water wet shotcreting system
Technical field
The present invention relates to a kind of shotcrete technology system, be specifically related to a kind of novel closed continuous quadratic and add water wet shotcreting system, be mainly used in the sprayed mortar in geotechnical engineering, slope project and underground construction.
Background technology
Concrete-spraying technology is widely used in the support reinforcement of various country rock tunnel and side slope.At present, the method that two kinds are prepared sprayed mortar is mainly contained, i.e. dry shotcreting and wet shotcreting.Dry shotcreting is that dry mix (cement, aggregate and powder accelerator) is delivered to nozzle place by spraying machine under compressed air drives, and is injected into by spray plane after adding water.Wet shotcreting is then by wet mix (cement, aggregate and water), and the mode sent by pumping or wind by spraying machine is delivered to after nozzle mixes with liquid accelerating agent and is ejected into by spray plane.
Dry shotcreting is applied comparatively extensive at home and abroad.Its major advantage is that equipment is simple, and type is small and exquisite, and transport and conveniently moving, compound fed distance is long, and powder accelerator can add before entering spraying machine.But also there is many intrinsic defects: 1. its work plane Dust Capacity and springback capacity are all comparatively large, and work under bad environment, has pulse phenomenon during material spray and the uniformity is poor; 2. actual water ash mass ratio not easily accurately controls, and affects the quality of sprayed mortar; 3. production efficiency is low.
Wet shotcreting major advantage is that springback capacity is low, and efficiency of construction is high, and inlet zone Dust Capacity is little, and homogeneity is good.Equally, it also has many weak points: 1. wet shotcreting construction technology is than dry shotcreting complex process, and material require with use, and requires very high to the match ratio of material, workability and pumping; 2. for bad adaptability that is moist or water bearing ground; 3. to the region construction being difficult to pass in and out, because machinery is huger, use very inconvenient, the engineering shortcoming flexibility less to use amount; 4. the easy plugging of wet shotcreting, clear very inconvenient.
In practice of construction operation, water and mix independent delivery is required owing to spraying spraying machine itself, mix at shower nozzle place, then eject, in high-speed motion, common dry spraying machine sprinkler design is simple, the abundant mixing of water material cannot be ensured, cause dust large, the poor jeting effect such as resilience is high, and the severe contamination operating environment of constructor.
The mixing of water and mix whether abundant, the jeting effect of the directly dry spray of impact, determines the size of Dust Capacity and the height of springback capacity.In existing dry spraying machine facility, the design for shower nozzle is too simple, cannot meet the well-mixed requirement of water material.
Summary of the invention
For above prior art, for overcoming the deficiency of above-mentioned technology, the invention provides a kind of closed continuous quadratic to add water wet shotcreting system, secondary can be realized add water, on the basis of original tide spray, reach the effect of wet shot, the springback capacity of effective reduction sprayed mortar and Dust Capacity, improve operating environment, reduce engineering time and cost, equipment is flexible simultaneously, easy construction, be easy to operation, be mainly applicable to the sprayed mortar in all kinds of chambers such as traffic tunnel, water conservancy tunnel, civil air defense constructions and installations, mine working and underground construction.
The present invention is achieved by the following technical solutions:
A kind of closed continuous quadratic adds water wet shotcreting system, comprise injection apparatus, screw rod feeding device, shower nozzle mixing arrangement, the feeding mouth of described injection apparatus and the outlet of screw rod feeding device, the outlet of described injection apparatus is connected with shower nozzle mixing arrangement entrance, and the entrance of described shower nozzle mixing arrangement is for inputting the mixture of water and liquid accelerating agent.
Described liquid accelerating agent is supplied by liquid accelerating agent feed system, and the output of liquid accelerating agent feed system connects an input of a three-way device, and another input of three-way device connects water under high pressure; The output of three-way device connects the input of shower nozzle mixing arrangement, and is provided with water valve on its connecting line.
Described water under high pressure is communicated to screw rod feeding device by a water pump.
The shower nozzle of described shower nozzle mixing arrangement is by a robot support.
Described injection apparatus adopts sprayed mortar watering jet eductor, carries out encapsulation process to it, reduces the other dust of machine.
Described screw rod feeding device, its screw rod is total closed type, and in screw rod feeding process, pre-add part water, concrete tide material first time is added water, and concrete moisture content reaches 40% ~ 60%, mix is better mixed with water, reduction dust.
Described liquid accelerating agent feed system, can add liquid accelerating agent in high-pressure water pipe, and accurately controls the addition of liquid accelerating agent, improves the performance of sprayed mortar each side.
Described shower nozzle mixing arrangement, comprises the water material mixing portion, two rooms mixing portion and the nozzle segment that are communicated with successively.
Described water material mixing portion comprises two pipelines, water ring, water cavity, rubber pad, two drot gfasplng scale valves, two described drot gfasplng scale valves are located on a pipeline respectively separately, the outlet of two pipelines is all communicated with same water cavity, and be provided with a water ring at the Exit Road of the pipeline led to aqueous phase, rubber pad is positioned at water cavity wall, play the effect of buffering, avoid concrete mixture to cause too large wearing and tearing to water cavity wall.
Drot gfasplng scale valve is used for controlling inflow accurately, thus reaches the effect controlling water/binder ratio, and by water ring, current can separate type mix in water cavity with mix, thus reach good water material mixed effect;
Described two rooms mixing portion comprises two rooms rubber tube, in the rubber tube of two rooms, form two rooms hybrid chamber, described two rooms rubber tube inwall is irregularly shaped, and it is by dual unexpected variable-diameter effect, cause cavity internal pressure to change, thus water material is fully mixed further;
Described nozzle segment comprises the jet pipe of lengthening, extends the water of high-speed motion and the time of contact of mix, ensures the full and uniform mixing of water material.
Described water material mixing portion, two rooms hybrid chamber part and nozzle segment, be all connected by standard thread interface, is convenient to maintenance and accessory.
The water ring interface of described water material mixing portion is that surrounding stays round-meshed metal ring, and current are entered in water cavity by circular hole.
The rubber pad of described water material mixing portion is the sealing in order to ensure water cavity, prevents High-Pressure Water from revealing.
Described water material mixing portion and nozzle segment are lightweight magnadure material, light and durable.
Described pair of room rubber tube structure is formed in one design, ensures the sealing of two rooms hybrid chamber, and ensures passing through smoothly of water material, avoids producing plugging.
Described nozzle segment comprises a hybrid chamber, ensures the fully mixing further of water material.
Described manipulator is a kind of movable supporting frame, can by shower nozzle pillar, flexible rotating, reduces labour.
Described liquid accelerating agent feedway, comprises liquid accelerating agent charging basket, trolley and screw type quantitative pump, and wherein, be provided with the support holding liquid accelerating agent charging basket above trolley, liquid accelerating agent charging basket is shelved on support; Screw type quantitative pump is fixed on trolley, is positioned at below liquid accelerating agent charging basket, screw type quantitative pump by motor, be located at the manual frequency modulator on motor and the screw rod that is connected with motor forms, screw rod end is provided with discharging opening, is provided with charging aperture in the middle part of screw rod; Be provided with conveying pipeline bottom liquid accelerating agent charging basket, the conveying pipeline other end is connected with charging aperture, and conveying pipeline is provided with the control valve that can control liquid accelerating agent flow.
Described liquid accelerating agent charging basket is marked with scale, clearly can see the reserves of liquid accelerating agent; Draw a conveying pipeline bottom it, and be installed on control valve, to control the flow of liquid accelerating agent, liquid accelerating agent is flowed in screw pump uniformly.Liquid accelerating agent charging basket can be designed as uncovered, is furnished with bung, can repeat to add liquid accelerating agent, in construction, bung can prevent accelerating admixture contaminated.
Described trolley is a kind of running gear, and be device conventional in prior art, liquid accelerating agent charging basket and screw type quantitative pump are effectively combined as a whole by it, and can promote walking, make the supply of liquid accelerating agent become an independently structure.
Described screw type quantitative pump is a kind of weigh feeder, for device conventional in prior art, it accurately can control the addition of liquid accelerating agent: be always divided into ten apertures, 20 revolutions are had under ten apertures, the flow often turned is fixing, by regulating its revolution, the addition of liquid accelerating agent effectively can be controlled.
Liquid accelerating agent feedway of the present invention, during use, discharging opening is connected with high-pressure water pipe, operating principle is: liquid accelerating agent flows out from liquid accelerating agent charging basket, regulate its flow through control valve, enter the charging aperture of screw type quantitative pump, provide pumping pressure by motor, through screw rod, by discharging opening force feed in high-pressure water pipe, thus complete the supply of liquid accelerating agent.
The course of work of the present invention is as follows:
Tide spice, by screw rod feeding device, in feeding process, carries out stirring and adds water in advance, being delivered in spraying machine.Liquid accelerating agent joins in high-pressure water pipe by feed system, and mix and water, liquid accelerating agent converge in shower nozzle mixing arrangement, are together injected into by spray plane.
The present invention compared with prior art, has following outstanding advantages:
(1) closed continuous quadratic of the present invention adds water wet shotcreting system, liquid accelerating agent is applied in damp spray technique, and can carries out adding water for twice, effectively reduce springback capacity and the Dust Capacity of sprayed mortar in construction, improve sprayed mortar quality, reduce labour hour and cost.
(2) screw rod feeding device, adopts total sealing device, in concrete feeding process, carries out prehydration to compound, concrete is fully mixed with water, avoid the generation of dust.
(3) liquid accelerating agent feed system, accurately can control the addition of liquid accelerating agent, ensure that the performance of sprayed mortar, as time of setting, intensity, durability etc.
(4) shower nozzle mixing arrangement adopts vortex principle, and concrete mix is fully mixed with water, liquid accelerating agent, improves sprayed mortar quality, reduces dust and resilience when spraying.During use, current are by the accurate control of drot gfasplng scale valve, and via the water pipe of both sides, under the effect of porous water ring, discrete type enters in water cavity, and mix tentatively mixes; And then enter two rooms hybrid chamber, by the reducing effectiveness of sudden change, change cavity internal pressure, thus water material is mixed further; Hybrid chamber again via nozzle place completes last mixing, and by lengthening jet pipe, extend the time of contact of water material, ensure the full and uniform mixing of water material, thus greatly reduce dust, reduce springback capacity, thus improve ejection efficiency and jeting effect, ensure that construction operation personnel's is healthy.
(5) liquid accelerating agent feedway of the present invention, makes liquid accelerating agent be successfully applied in techmque, and the use of liquid accelerating agent greatly reduces springback capacity and Dust Capacity, improves working environment, decreases construction cost.The use of screw type quantitative pump, effectively can control the addition of liquid accelerating agent: the performance of addition on sprayed mortar each side of accelerating admixture has larger impact, as before final setting time, front later strength, adhesion strength, creeping property etc.What this device made liquid accelerating agent is added to an independently system, and can conveniently transport; Meanwhile, volume is little, does not take too many space.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the longitudinal plane structure schematic diagram of new type nozzle of the present invention;
Fig. 3 is liquid accelerating agent feed system schematic diagram.
In figure, 1, damp spice; 2, screw rod feeding device; 3, spraying machine; 4, water under high pressure; 5, quantity of water metering meter; 6, liquid accelerating agent feedway; 7, three-way device; 8, concrete mix; 9, the mixture of water and liquid accelerating agent; 10, shower nozzle mixing arrangement; 11, water valve; 10-1. drot gfasplng scale valve, 10-2. water pipe, 10-3. water ring, 10-4. two rooms hybrid chamber, 10-5. two rooms rubber tube, 10-6. jet pipe; 6-1. liquid accelerating agent charging basket, 6-2. small handcart, 6-3. screw type quantitative pump, 6-4. control valve, 6-5. conveying pipeline.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, a kind of closed continuous quadratic adds water wet shotcreting system, comprises injection apparatus, screw rod feeding device 2, liquid accelerating agent feed system, shower nozzle mixing arrangement 10 and skeleton symbol manipulator.The feeding mouth of described injection apparatus and the outlet of screw rod feeding device, described injection apparatus also exports with shower nozzle mixing arrangement and is connected, and the entrance of described shower nozzle mixing arrangement connects the mixture of water and liquid accelerating agent.
Liquid accelerating agent is supplied by liquid accelerating agent feed system, and the output of liquid accelerating agent feed system connects an input of a three-way device 7, and another input of three-way device 7 connects water under high pressure; The output of three-way device connects the input of shower nozzle mixing arrangement, and is provided with water valve 11 on its connecting line.
Water under high pressure 4 is communicated to screw rod feeding device by a quantity of water metering meter 5.
The shower nozzle of shower nozzle mixing arrangement 10 is by a robot support.
Injection apparatus adopts sprayed mortar watering jet eductor, carries out encapsulation process to it, reduces the other dust of machine.
Described screw rod feeding device, its screw rod is total closed type, and in screw rod feeding process, pre-add part water, concrete tide material first time is added water, and concrete moisture content reaches 40% ~ 60%, mix is better mixed with water, reduction dust.
This technique uses damp spice 1, adds in screw rod feeding device by damp spice 1, along with helical screw agitator enters in spraying machine, is delivered in shower nozzle mixing arrangement via pressure-air.High-pressure water pipe is divided into two-way, and a road supply screw rod carries out concrete mix and adds water for the first time, and another road adds, by manipulator control at shower nozzle place; Liquid accelerating agent feed system, the addition of energy accurate quantification accelerating admixture, by the pumping installations of self, liquid accelerating agent is pressed in the high-pressure water pipe at shower nozzle place, after liquid accelerating agent and water mix, one coexists in shower nozzle mixing arrangement mixes with mix, via skeleton symbol manipulator, is injected into by spray plane.
Tide spice 1 to add water feeder 2 via screw rod, and in feeding process, carry out stirrings and add water for the first time, amount of water is 40% ~ 60% of whole concrete water requirement, whole screw rod feeding device, for sealed, does not produce dust, then be transported in spraying machine 3, spraying machine is vacuum tightness pumped type.Water under high pressure 4 is divided into two-way, and the first via is integrated together via quantity of water metering meter 5 and the screw rod feeder 2 that adds water, and the second tunnel is directly connected with shower nozzle mixing arrangement 10, regulates amount of water by water valve 11.Liquid accelerating agent feedway 6 is connected with high-pressure water pipe by three-way device 7, liquid accelerating agent is pumped in water under high pressure 4, define the mixture 9 of liquid accelerating agent and water, the concrete mix 8 of the water containing 40% ~ 60% together enters in shower nozzle mixing arrangement 10 with the mixture 9 of liquid accelerating agent and water, is together injected into by spray plane.
As shown in Figure 2, a kind of Novel dry spraying machine multiple mixing cavate ejecting device for dry sprayed concrete construction operation, comprises water material mixing portion I, two rooms mixing portion II and nozzle segment III.
Wherein, water material mixing portion I comprises water pipe 10-2, water ring 10-3, water cavity, rubber pad, drot gfasplng scale valve 10-1, two described drot gfasplng scale valves are located on a pipeline respectively separately, the outlet of two pipelines is all communicated with same water cavity, and be provided with a water ring at the Exit Road of the pipeline led to aqueous phase, rubber pad is positioned at water cavity wall, plays the effect of buffering, avoids concrete mixture to cause too large wearing and tearing to water cavity wall.Drot gfasplng scale valve 10-1 is used for controlling inflow accurately, thus reaches the effect controlling water/binder ratio, and by water ring, current can separate type mix in water cavity with mix, thus reach good water material mixed effect.
Two rooms mixing portion II comprises two room rubber tube 10-5 and two room hybrid chamber 10-4, by dual unexpected variable-diameter effect, causes cavity internal pressure to change, thus water material is fully mixed further.
Nozzle segment III comprises the jet pipe 10-6 of lengthening, extends the water of high-speed motion and the time of contact of mix, ensures the full and uniform mixing of water material.
Water material mixing portion, two rooms hybrid chamber part and nozzle segment, be all connected by standard thread interface, is convenient to maintenance and accessory.
The water ring interface of water material mixing portion is that surrounding stays round-meshed metal ring, and current are entered in water cavity by circular hole.The rubber pad of water material mixing portion is the sealing in order to ensure water cavity, prevents High-Pressure Water from revealing.
Water material mixing portion and nozzle segment are lightweight magnadure material, light and durable.
Two rooms rubber tube structure is formed in one design, ensures the sealing of two rooms hybrid chamber, and ensures passing through smoothly of water material, avoids producing plugging.Nozzle segment comprises a hybrid chamber, ensures the fully mixing further of water material.
As shown in Figure 3, liquid accelerating agent feedway, comprise liquid accelerating agent charging basket 6-1, trolley 6-2 and screw type quantitative pump 6-3, wherein, be provided with the support holding liquid accelerating agent charging basket above trolley, liquid accelerating agent charging basket is shelved on support; Screw type quantitative pump is fixed on trolley, is positioned at below liquid accelerating agent charging basket, screw type quantitative pump by motor, be located at the manual frequency modulator on motor and the screw rod that is connected with motor forms, screw rod end is provided with discharging opening, is provided with charging aperture in the middle part of screw rod; Be provided with conveying pipeline 6-4 bottom liquid accelerating agent charging basket, the conveying pipeline 6-4 other end is connected with charging aperture, and conveying pipeline is provided with the control valve 6-5 that can control liquid accelerating agent flow.
Liquid accelerating agent charging basket is marked with scale, clearly can see the reserves of liquid accelerating agent; Draw a conveying pipeline bottom it, and be installed on control valve, to control the flow of liquid accelerating agent, liquid accelerating agent is flowed in screw pump uniformly.Liquid accelerating agent charging basket can be designed as uncovered, is furnished with bung, can repeat to add liquid accelerating agent, in construction, bung can prevent accelerating admixture contaminated.
Trolley is a kind of running gear, and be device conventional in prior art, liquid accelerating agent charging basket and screw type quantitative pump are effectively combined as a whole by it, and can promote walking, make the supply of liquid accelerating agent become an independently structure.
Screw type quantitative pump is a kind of weigh feeder, for device conventional in prior art, it accurately can control the addition of liquid accelerating agent: be always divided into ten apertures, 20 revolutions are had under ten apertures, the flow often turned is fixing, by regulating its revolution, the addition of liquid accelerating agent effectively can be controlled.
Liquid accelerating agent feedway, during use, discharging opening is connected with high-pressure water pipe, operating principle is: liquid accelerating agent flows out from liquid accelerating agent charging basket, regulate its flow through control valve, enter the charging aperture of screw type quantitative pump, provide pumping pressure by motor, through screw rod, by discharging opening force feed in high-pressure water pipe, thus complete the supply of liquid accelerating agent.

Claims (7)

1. a closed continuous quadratic adds water wet shotcreting system, it is characterized in that: comprise injection apparatus, screw rod feeding device, shower nozzle mixing arrangement, the feeding mouth of described injection apparatus and the outlet of screw rod feeding device, the outlet of described injection apparatus is connected with shower nozzle mixing arrangement entrance, and the entrance of described shower nozzle mixing arrangement is for inputting the mixture of water and liquid accelerating agent;
This system uses damp spice, is added by damp spice in screw rod feeding device, along with helical screw agitator enters in spraying machine,
Described screw rod feeding device, its screw rod is total closed type, and in screw rod feeding process, pre-add partial high pressure water, makes concrete tide material first time add water, mix is better mixed with water;
Described water under high pressure is communicated to screw rod feeding device by a water pump; Described water under high pressure is divided into two-way, and the first via is integrated together via quantity of water metering meter and described screw rod feeding device, and the second tunnel is directly connected with described shower nozzle mixing arrangement, regulates amount of water by water valve;
Described concrete tide material first time, when adding water, described concrete moisture content reached 40% ~ 60%, and mix is better mixed with water, reduces dust;
Described shower nozzle mixing arrangement, comprises the water material mixing portion, two rooms mixing portion and the nozzle segment that are communicated with successively.
2. closed continuous quadratic as claimed in claim 1 adds water wet shotcreting system, it is characterized in that: described liquid accelerating agent is supplied by liquid accelerating agent feedway, and the output of liquid accelerating agent feedway connects an input of a three-way device, another input of three-way device connects water under high pressure; The output of three-way device connects the input of shower nozzle mixing arrangement, and is provided with water valve on its connecting line.
3. closed continuous quadratic as claimed in claim 2 adds water wet shotcreting system, it is characterized in that: described liquid accelerating agent feedway, comprise liquid accelerating agent charging basket, trolley and screw type quantitative pump, wherein, be provided with the support holding liquid accelerating agent charging basket above trolley, liquid accelerating agent charging basket is shelved on support; Screw type quantitative pump is fixed on trolley, is positioned at below liquid accelerating agent charging basket, screw type quantitative pump by motor, be located at the manual frequency modulator on motor and the screw rod that is connected with motor forms, screw rod end is provided with discharging opening, is provided with charging aperture in the middle part of screw rod; Be provided with conveying pipeline bottom liquid accelerating agent charging basket, the conveying pipeline other end is connected with charging aperture, and conveying pipeline is provided with the control valve that can control liquid accelerating agent flow.
4. closed continuous quadratic as claimed in claim 3 adds water wet shotcreting system, it is characterized in that: described liquid accelerating agent charging basket is marked with scale, clearly can see the reserves of liquid accelerating agent; Draw a conveying pipeline bottom it, and be installed on control valve, to control the flow of liquid accelerating agent, liquid accelerating agent is flowed in screw pump uniformly; Liquid accelerating agent charging basket is uncovered, is furnished with bung, can repeat to add liquid accelerating agent, in construction, bung can prevent accelerating admixture contaminated.
5. closed continuous quadratic as claimed in claim 1 adds water wet shotcreting system, it is characterized in that: the shower nozzle of described shower nozzle mixing arrangement is by a robot support, and described manipulator is a kind of traversing carriage, can by shower nozzle pillar, flexible rotating, reduces labour.
6. closed continuous quadratic as claimed in claim 1 adds water wet shotcreting system, it is characterized in that: described water material mixing portion comprises two pipelines, water ring, water cavity, rubber pad, two drot gfasplng scale valves, two described drot gfasplng scale valves are located on a pipeline respectively separately, the outlet of two pipelines is all communicated with same water cavity, and be provided with a water ring at the Exit Road of the pipeline led to aqueous phase, rubber pad is positioned on water cavity wall, play the effect of buffering, avoid concrete mixture to cause too large wearing and tearing to water cavity wall; Drot gfasplng scale valve is used for controlling inflow accurately, thus reaches the effect controlling water/binder ratio, and by water ring, water flow energy separate type mixes in water cavity with mix, thus reaches good water material mixed effect.
7. closed continuous quadratic as claimed in claim 1 adds water wet shotcreting system, it is characterized in that: described two rooms mixing portion comprises two rooms rubber tube, two rooms hybrid chamber is formed in the rubber tube of two rooms, described two rooms rubber tube inwall is irregularly shaped, it is by unexpected variable-diameter effect, cause cavity internal pressure to change, thus water material is fully mixed further.
CN201410064227.2A 2014-02-25 2014-02-25 Closed continuous quadratic adds water wet shotcreting system Expired - Fee Related CN103821148B (en)

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