CN104289080A - Control method for preventing dampening adsorption type twin tower drying device - Google Patents
Control method for preventing dampening adsorption type twin tower drying device Download PDFInfo
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Abstract
The invention provides a control method for preventing dampening an adsorption type twin tower drying device. The drying device is provided with two drying towers that realize mutual switch of the working state through cooperation of an electromagnetic valve and a reversing valve. When the drying device is in an out-of-service state or work interval state, the air outlets of the reversing valve connected to the two drying towers are sealed so as to isolate the two drying towers from the atmosphere, thereby preventing dampening the drying towers. Compared with the background art, the biggest characteristic of the invention lies in that: a third working state is added on the basis of only two working states (drying and regeneration) of the current adsorption type twin tower drying device, i.e. when the device is out-of-service or the work interval time is long, the device is in a sealed state, the outside wet air is isolated, and dampening of an adsorbent is prevented, thus avoiding aggravating the dryer load due to dampening of the adsorbent.
Description
Technical field
The present invention relates to a kind of control method preventing absorption type double tower drying device from making moist, belong to rail vehicle wind regime technical field of drying.
Background technology
Containing higher moisture, oil content and mechanical admixture etc. in the compressed air that air compressor machine exports, the phenomenon such as railway vehicle braking system can be caused to produce corrosion, blocking, condensate water if do not remove, freeze, thus cause train braking fault.Therefore, compressed air has to pass through dry filter, just can reach train braking air quality requirements.In order to realize uninterrupted air feed to downstream gas equipment, nearly all absorbed type drying device is all designed to Double-Tower Structure, dry and regeneration need be carried out simultaneously, namely one of them tower is when carrying out adsorption operations, another tower carries out regenerative operation to adsorbent simultaneously, and after certain hour, double tower operating mode automatically switches.
In current published absorption type double tower drying device pneumatic control circuit, many employing multiple intake valve, air bleeding valve, realize above-mentioned functions.As shown in Figure 1: compression humid air enters left side drying tower A by intake valve a and carries out adsorption dry, major part dry gas is by outer air feed after pneumatic operated valve e, fraction regeneration gas (≤18%) enters drying tower B by choke valve g and carries out desorption and regeneration, and eventually through air bleeding valve d, waste gas is discharged air, in figure, b is intake valve, and c is air bleeding valve.
Usually, this absorption type double tower drying device all only has two states (the dry B tower regeneration of A tower, or the dry A tower regeneration of B tower).When device does not work for a long time, be in the air bleeding valve d of regeneration under the effect of pilot pressure, all the time opening is in, regenerator B is caused to expose for a long time in atmosphere, and be communicated with adsorption tower A eventually through choke valve g, cause the adsorbent in two drying towers to make moist, suction is even rotten excessively, so that drying tower drying property declines, need after each startup optimization repeatedly to purge drying tower for a long time, could allow drier activity recovery gradually.Consequence is, directly increases the live load of drier, causes device premature failure, and delivery air degradation causes great risk to car brakeing.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the above-mentioned shortcoming of prior art, provides a kind of absorption type double tower drying device, its integration mode is simple, working service is convenient.
In order to solve above technical problem, the control method preventing absorption type double tower drying device from making moist provided by the invention, described drying device is had two and is coordinated the drying tower realizing mutual switch operating state by magnetic valve with reversal valve, when drying device is in off working state or operation range state, the exhaust outlet of the reversal valve be connected with two drying towers is closed, make two drying towers and atmospheric isolation, thus prevent drying tower from making moist.
In order to solve above technical problem, the present invention further improves and is:
1, described magnetic valve is 3 position-5 way pilot solenoid valve, and it has an air inlet, two gas outlets, and two scavenge ports be communicated with air; Described reversal valve is 3 position-5 way guide air operated reversing valve, it has an air inlet be connected with compressed air source, two gas outlets be connected with two drying tower air inlets respectively, two pilot pressure input ports be connected with magnetic valve gas outlet, and two scavenge ports be communicated with air; When drying device is in off working state or operation range state, the coil losing electricity of magnetic valve, the gas outlet of magnetic valve communicates with scavenge port, the pilot pressure input port decompression of reversal valve, close the scavenge port of reversal valve, thus guarantee between drying tower and air isolated.
2, the gas outlet of two drying towers connects the air inlet of minimum pressure valve and magnetic valve respectively after check valve, and the separated air flue by being equipped with choke valve between the gas outlet of described two drying towers is connected.
3, described reversal valve comprises valve body, be arranged at two valve modules of valve body, each valve module all has slidably piston, pilot pressure input port and is arranged at the air inlet interconnected on valve body, gas outlet, scavenge port, the first end of piston is provided with template and stage clip, the pilot pressure chamber of sealing is formed between described template and pilot pressure input port, second end of piston is provided with spool, when stage clip is in release conditions, the lateral surface of spool closes scavenge port, is path between air inlet and gas outlet; When stage clip is in compressive state, the medial surface of spool closes the gas circuit between air inlet and gas outlet, is path between gas outlet and scavenge port.
4, two valve modules share an air inlet be arranged on valve body, in described valve body, there is chamber, this chamber has the air inlet be communicated with two valve module air inlets and two gas outlets be communicated with scavenge port with the gas outlet of two valve modules respectively, and the gas outlet of chamber forms a triplate line with corresponding valve module gas outlet and scavenge port; When the stage clip of a certain side valve assembly is in release conditions, be path between the gas outlet of the corresponding side of chamber and the gas outlet of this valve module, now, the air inlet of this side valve assembly is communicated with gas outlet; When the stage clip of a certain side valve assembly is in compressive state, the gas outlet of the corresponding side of chamber is closed, and now, is path between the gas outlet of this side valve assembly and scavenge port.
5, described chamber offers two groups of through holes holding spool and pass, and the through hole near spool one end is the gas outlet of chamber, and the through-hole wall away from spool is embedded with the sealing ring be wrapped on piston, for cutting off chamber and pilot pressure chamber.
6, described magnetic valve has two and is respectively used to control left side and the coil of right side gas circuit, when two coils must not electricity time, the air inlet of magnetic valve is in closed state, and scavenge port is connected with gas outlet; The pressure obtaining the input of electric and air inlet when a lateral coil is greater than self pilot pressure, then the air inlet of this side of magnetic valve and gas outlet conducting, and this side scavenge port closedown; It is electric that magnetic valve can only have a lateral coil to obtain, two coils can not simultaneously electric.
7, during drying device work, electromagnetic valve coil obtains the pilot pressure mouth output pilot pressure of gas outlet to reversal valve of electric side, reversal valve air inlet is communicated with the gas outlet of this side, thus to corresponding side drying tower input compressed-air, carries out drying process; A dried compressed air part sends into reservoir, and a part to be oppositely blown into after opposite side drying tower through the scavenge port of reversal valve opposite side discharged to air, makes opposite side drying tower be in reproduced state.
8, by switching solenoid valve coil dead electricity, the switching between two drying tower duties can be realized.
It should be noted that, the minimum pilot pressure that should be greater than magnetic valve self by pressure of minimum pressure valve, also should be greater than the pilot pressure of reversal valve simultaneously.That is internal system pressure set up after, before gas pressure increases to by minimum pressure valve, in system pressure should be greater than magnetic valve pilot pressure and opposing stage clip tension force and by the template jack-up of valve module.
The present invention is on the basis of absorption type double tower drying device absorption and regeneration two kinds of duties, increase the third duty, namely device do not work or the operation range time is longer time, device is in closed state, isolate extraneous humid air, prevent adsorbent from making moist, increase the weight of drier load to avoid adsorbent to make moist.
The third duty is realized by a special reversal valve and magnetic valve combination.Reversal valve is the 3 position-5 way pilot-operated type pneumatic operated valve of a uniqueness, and two gas outlets of reversal valve are connected with the air inlet of two drying towers in left and right respectively.Two scavenge ports of initial position reversal valve are all in closed condition.Magnetic valve is 3 position-5 way guide electromagnetic valve, and magnetic valve two gas outlets are connected with two pilot pressure mouths of reversal valve respectively.Two scavenge ports of initial position magnetic valve are in opening.During work: it is electric that two coils of magnetic valve only have side to obtain all the time, meet after switching pressure, export a road to reversal valve and control air pressure, reversal valve side scavenge port is opened, cause the drying tower of this side to be in reproduced state, and the drying tower of opposite side is in adsorbed state.During shutdown, two equal dead electricity of coil of magnetic valve, the first guide cavity air pressure of reversal valve by the off-load of magnetic valve scavenge port, and then restPoses.Because compressor does not work, loop stuffiness, like this, two air-path interfaces just equal and isolated from atmosphere that drying tower is external, stop device busy interval, or transported, deposited the intrusion of extraneous humid air in process for a long time, prevent adsorbent from becoming damp and rotten.
Control method of the present invention is simple, is convenient to Realization of Product, is suitable for the post processing of modern railway transportation air.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is existing absorption type double tower drying device pneumatic control circuit schematic diagram.
Fig. 2 is the present embodiment absorption type double tower drying device structural representation.
Fig. 3 is the integrated air board structural representation of the present embodiment absorption type double tower drying device.
Fig. 4 is the reversal valve outline drawing of the present embodiment absorption type double tower drying device.
Fig. 5 is the reversal valve internal structure schematic diagram (the first state) of the present embodiment absorption type double tower drying device.
Fig. 6 is the reversal valve using state schematic diagram (the second state) of the present embodiment absorption type double tower drying device.
Fig. 7 is the reversal valve using state schematic diagram (third state) of the present embodiment absorption type double tower drying device.
Fig. 8 is the schematic diagram of gas circuit of the present embodiment absorption type double tower drying device.
Under number in the figure schematic diagram:
1-reversal valve, 2-muffler, 3-piston, 4-pilot pressure input port, 5-air inlet, 6-gas outlet, 7-scavenge port, 8-template, 9-stage clip, 10-pilot pressure chamber, 11-spool, 12-chamber, 13-first drying tower, 14-second drying tower, 15-magnetic valve, 16-first check valve, 17-second check valve, 18-test splice, 19-minimum pressure valve, 20-choke valve, 21-pressure sensor, 22-integrated air board, 23-electric controller, 24-first pressure indicator, 25-second pressure indicator, 26-humidity indicator, 27-temperature switch, 28-heater.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
As Fig. 2, be the present embodiment control method institute control object---absorption type double tower drying device, composition comprises: the first drying tower 13, second drying tower 14, magnetic valve 15, reversal valve 1, integrated air board 22, electric controller 23.
As shown in Figure 2 and Figure 3, integrated air board is fixed with the first drying tower 13, second drying tower 14, magnetic valve 15, reversal valve 1, electric controller 23, first check valve 16,17-second check valve 17, choke valve 20, minimum pressure valve 19, test splice 18, first pressure indicator 24, second pressure indicator 25, humidity indicator 26.
Wherein, magnetic valve 15, test splice 18 are connected with electric controller 23.
In the present embodiment, magnetic valve 15 is preced with VR61Z711A type 3 position-5 way guide electromagnetic valve for selecting promise, it has an air inlet be connected with two drying tower gas outlets, two for exporting the gas outlet (working hole) of pilot pressure, and two scavenge ports be communicated with air.When must not electricity time, the air inlet of magnetic valve 15 is closed, and scavenge port is connected with gas outlet; Self pilot pressure is greater than, then the air inlet on right side and gas outlet conducting when left side coil obtains pressure that is electric and input, and scavenge port closedown, left side gas circuit remains unchanged.Right side coil obtains electrically trend and left side, and to obtain electric situation contrary.It should be noted that, it is electric that this magnetic valve can only have a lateral coil to obtain, two coils can not simultaneously electric.
As shown in Figure 4, Figure 5, in this example, reversal valve is 3 position-5 way guide air operated reversing valve, and the scavenge port of reversal valve 1 is provided with for the pressure sensor 21 of checkout gear duty and the muffler 2 for eliminating exhaust noise; Reversal valve being also provided with the temperature switch 27 and heater 28 that are connected with electric controller, freezing for preventing low temperature.
The control method that the embodiment of the present invention prevents absorption type double tower drying device from making moist, this drying device is had two and is coordinated the drying tower realizing mutual switch operating state by magnetic valve with reversal valve, when drying device is in off working state or operation range state, the exhaust outlet of the reversal valve be connected with two drying towers is closed, make two drying towers and atmospheric isolation, thus prevent drying tower from making moist.
As shown in Figure 5, in valve body, be provided with the valve module that two structures are identical, be described for left hand valve assembly below.
Left hand valve assembly has slidably piston 3, pilot pressure input port 4 and is arranged at the air inlet 5 interconnected on valve body, gas outlet 6, scavenge port 7.In this example, two valve modules share an air inlet 5 be arranged on valve body.This reversal valve is a 5 way valve.As shown in Figure 5, still for left hand valve assembly, the first end of piston 3 is provided with template 8 and stage clip 9, stage clip 9 two ends prop up the first end outer wall of valve body and piston 3 respectively, and stage clip 9 provides pretightning force, when not stressing, the low-end trim that piston 3 is positioned at, is shown in left hand valve assembly in Fig. 5, Fig. 7.Form the pilot pressure chamber 10 of sealing between template 8 and pilot pressure input port 4, pilot pressure chamber 10 accepts controlled pressure gas, above can push away the elastic force that template 8 overcomes stage clip 9, thus drives piston 3 to move upward, and sees Fig. 6 left hand valve assembly.Second end of piston 3 is provided with spool 11, and when stage clip 9 is in release conditions, the lateral surface of spool 11 closes scavenge port 7, is path between air inlet 5 and gas outlet 6.As shown in Figure 5, the gas now entering reversal valve blows out from 2 gas outlets of valve body respectively through path.As shown in Figure 6, when stage clip place 9 is in compressive state, the medial surface of spool 11 closes the pipeline between air inlet 5 and gas outlet 6, and be path between gas outlet 6 and scavenge port 7, the pipeline connecting air inlet and gas outlet in two valve modules is interconnected.
As shown in Figure 5, in the present embodiment, there is in valve body chamber 12, this chamber 12 has the air inlet be communicated with two valve module air inlets and two gas outlets be communicated with scavenge port with the gas outlet of two valve modules respectively, and the gas outlet of chamber 12 forms a triplate line with corresponding valve module gas outlet and scavenge port.When the stage clip of a certain side valve assembly is in release conditions, be path between the gas outlet of the corresponding side of chamber and the gas outlet of this valve module, now the air inlet of this valve module is communicated with gas outlet; When the stage clip of a certain valve module is in compressive state, the gas outlet of the corresponding side of chamber is closed, and is now path between the gas outlet of this valve module and scavenge port.As illustrated in figs. 5-7, chamber 12 offers two groups of through holes holding spool and pass, and the through hole near spool one end is the gas outlet of chamber, and the through-hole wall away from spool is embedded with the sealing ring be wrapped on piston, for cutting off chamber and pilot pressure chamber.
In order to ensure the sealing of spool close port, can in each valve module, the lateral surface of spool embeds the ring-shaped rubber adapted with valve module scavenge port; The medial surface of spool is embedded with the ring-shaped rubber that gas outlet corresponding to chamber adapts.Also can in each valve module, the inner side of scavenge port is provided with ring-shaped rubber; The arranged outside of chamber exit has ring-shaped rubber.Utilize ring-shaped rubber to have certain flexible feature, make to reach good air-tightness between spool and valve port and between spool and chamber exit.
Below in conjunction with Fig. 8, the control procedure of this double tower drying device is described.
During original state, compressor does not work, and two coils of magnetic valve 15 all must not electricity, state that magnetic valve 15 is in " in let out ".Now, the gas outlet of magnetic valve 15 is connected with scavenge port, thus the pilot pressure chamber of two valve modules is connected with air, without pressure in the pilot pressure chamber making two valve modules, the scavenge port of two valve modules is closed, conducting between the air inlet of reversal valve 1 and two gas outlets.Reversal valve state is shown in Fig. 4.This state is original state, two valve module scavenge ports of reversal valve are all in closed condition, so, two air-path interfaces just equal and isolated from atmosphere that drying device is external, stopped device in transport, deposit or the intrusion of extraneous humid air in the batch process that works, prevent adsorbent from becoming damp and rotten.
After air compressor machine starts, device is started working, to reversal valve air inlet conveying compressed air.After the high pressure wet air of supply enters reversal valve 1 from double-tower dryer inlet channel P1, two, left and right drying tower is inflated simultaneously, due to the pressure accumulation non-return effect of minimum pressure valve 19, preferentially sets up intrasystem control atmospheric pressure.
During first cycle, the right side coil of magnetic valve 15 obtains electric, and on the right side of magnetic valve 15, gas outlet and right side scavenge port still keep being communicated with, and guarantees pilot pressure chamber not pressurising on the right side of reversal valve 1; When pressure in system exceedes the pilot pressure of magnetic valve 15, the gas outlet conducting on magnetic valve 15 air inlet and right side, right side scavenge port is closed; Gas outlet on the right side of magnetic valve 15, to the pilot pressure input port pressurising of reversal valve 1 right hand valve assembly, makes the action of reversal valve 1 right hand valve assembly, makes gas outlet and scavenge port conducting on the right side of reversal valve.The gas entering reversal valve leads to the first drier 13 from the gas outlet blowout of left hand valve assembly and carries out drying, and now left side drying tower is as " adsorption tower ".First drying tower 13 give vent to anger a part after the first check valve 16, minimum pressure valve 19 to cylinder air feed, simultaneously provide pilot pressure to magnetic valve 15; Another part is oppositely blown into the second drying tower 14 via choke valve 20, scavenge port and the gas outlet of the right hand valve assembly be now connected with the second drying tower 14 communicate with air, the reverse like this gases at high pressure be blown into expand under reduced pressure atmosphere, drier in from top to down purge column, and the humid air taken away in drier, discharge eventually through after muffler 2 noise reduction process, thus realize the desorption and regeneration to the second drying tower 14.Now, right side drying tower is " regenerator ".Reversal valve state is shown in Fig. 6.
When after work a period of time, enter second cycle.Magnetic valve carries out the switching of pilot pressure gas, and right side coil losing electricity, and left side coil obtains electric, and original " drying tower " is converted to " regenerator ", and original " regenerator " is converted to " drying tower ".Gas circuit trend is contrary, is not described in detail in this example.Reversal valve state is shown in Fig. 7.
So, first cycle and second cycle alternate cycles, go round and begin again, and can ensure the normal work of double-tower dryer.
When air compressor machine is shut down, magnetic valve two equal dead electricity of coil, the first guide cavity air pressure of reversal valve by the off-load of magnetic valve scavenge port, and then is in original state, that is two scavenge ports are all closed.Because compressor does not work, loop stuffiness, like this, two air-path interfaces just equal and isolated from atmosphere that drier is external, stop device busy interval, or transported, deposited the intrusion of extraneous humid air in process for a long time, prevent adsorbent from becoming damp and rotten.
Said process, can by being arranged on the pressure indicator Real Time Observation of gas path plate.Namely, when a tower pressurising is dry, the valve rod of pressure indicator is extrapolated rapidly outstanding, and once drying tower is transformed into reproduced state, the valve rod of pressure indicator can reset rapidly under spring force.
When the deterioration of device generation drier or regeneration fault, can Real-time Obtaining by humidity indicator.Namely, when drying device output gas humidity is higher, the discolour silica gel be filled in humidity indicator can change color gradually, and prompting operator should check control system and device in time.
In addition, be accurate measurements double tower switching condition, gathered the force value of reversal valve scavenge port by pressure sensor, then send into electric controller Treatment Analysis, external output status signal.Once the force value gathered does not change in setting cycle, be namely judged as fault-signal.
Therefore, double tower drying device of the present invention has the function of malfunction monitoring.By the pressure change of monitoring regeneration scavenge port, grasp whole operating performance of plant in real time, once break down, feed back to main system in time, substantially increase the reliability of product.
Visible, compact conformation of the present invention, form primarily of 5 mutual independently assemblies, each assembly can be changed in real time, independently, is convenient to maintenance management.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (9)
1. the control method preventing absorption type double tower drying device from making moist, described drying device is had two and is coordinated the drying tower realizing mutual switch operating state by magnetic valve with reversal valve, when drying device is in off working state or operation range state, the exhaust outlet of the reversal valve be connected with two drying towers is closed, make two drying towers and atmospheric isolation, thus prevent drying tower from making moist.
2. the control method preventing absorption type double tower drying device from making moist according to claim 1, it is characterized in that: described magnetic valve is 3 position-5 way pilot solenoid valve, it has an air inlet, two gas outlets, and two scavenge ports be communicated with air; Described reversal valve is 3 position-5 way guide air operated reversing valve, it has an air inlet be connected with compressed air source, two gas outlets be connected with two drying tower air inlets respectively, two pilot pressure input ports be connected with magnetic valve gas outlet, and two scavenge ports be communicated with air; When drying device is in off working state or operation range state, the coil losing electricity of magnetic valve, the gas outlet of magnetic valve communicates with scavenge port, the pilot pressure input port decompression of reversal valve, close the scavenge port of reversal valve, thus guarantee between drying tower and air isolated.
3. the control method preventing absorption type double tower drying device from making moist according to claim 2, it is characterized in that: the gas outlet of two drying towers connects the air inlet of minimum pressure valve and magnetic valve respectively after check valve, the separated air flue by being equipped with choke valve between the gas outlet of described two drying towers is connected.
4. the control method preventing absorption type double tower drying device from making moist according to claim 3, it is characterized in that: described reversal valve comprises valve body, be arranged at two valve modules of valve body, each valve module all has slidably piston, pilot pressure input port, and the air inlet interconnected be arranged on valve body, gas outlet, scavenge port, the first end of piston is provided with template and stage clip, the pilot pressure chamber of sealing is formed between described template and pilot pressure input port, second end of piston is provided with spool, when stage clip is in release conditions, the lateral surface of spool closes scavenge port, it is path between air inlet and gas outlet, when stage clip is in compressive state, the medial surface of spool closes the gas circuit between air inlet and gas outlet, is path between gas outlet and scavenge port.
5. the control method preventing absorption type double tower drying device from making moist according to claim 4, it is characterized in that: two valve modules share an air inlet be arranged on valve body, in described valve body, there is chamber, this chamber has the air inlet be communicated with two valve module air inlets and two gas outlets be communicated with scavenge port with the gas outlet of two valve modules respectively, and the gas outlet of chamber forms a triplate line with corresponding valve module gas outlet and scavenge port; When the stage clip of a certain side valve assembly is in release conditions, be path between the gas outlet of the corresponding side of chamber and the gas outlet of this valve module, now, the air inlet of this side valve assembly is communicated with gas outlet; When the stage clip of a certain side valve assembly is in compressive state, the gas outlet of the corresponding side of chamber is closed, and now, is path between the gas outlet of this side valve assembly and scavenge port.
6. the control method preventing absorption type double tower drying device from making moist according to claim 5, it is characterized in that: described chamber offers two groups of through holes holding spool and pass, through hole near spool one end is the gas outlet of chamber, through-hole wall away from spool is embedded with the sealing ring be wrapped on piston, for cutting off chamber and pilot pressure chamber.
7. the control method preventing absorption type double tower drying device from making moist according to any one of claim 1-6, it is characterized in that: described magnetic valve has the coil that two are respectively used to control left side and right side gas circuit, when two coils must not electricity time, the air inlet of magnetic valve is in closed state, and scavenge port is connected with gas outlet; The pressure obtaining the input of electric and air inlet when a lateral coil is greater than self pilot pressure, then the air inlet of this side of magnetic valve and gas outlet conducting, and this side scavenge port closedown; It is electric that magnetic valve can only have a lateral coil to obtain, two coils can not simultaneously electric.
8. the control method preventing absorption type double tower drying device from making moist according to claim 7, it is characterized in that: during drying device work, electromagnetic valve coil obtains the pilot pressure mouth output pilot pressure of gas outlet to reversal valve of electric side, reversal valve air inlet is communicated with the gas outlet of this side, thus to corresponding side drying tower input compressed-air, carry out drying process; A dried compressed air part sends into reservoir, and a part to be oppositely blown into after opposite side drying tower through the scavenge port of reversal valve opposite side discharged to air, makes opposite side drying tower be in reproduced state.
9. the control method preventing absorption type double tower drying device from making moist according to claim 8, is characterized in that: by switching solenoid valve coil dead electricity, the switching between two drying tower duties can be realized.
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Address after: 211800 Nanjing Road, Pukou District, Jiangsu, No. 10 Patentee after: Nanjing Zhongche town Haitai Brake Equipment Co Ltd Address before: 211800 Nanjing Road, Pukou District, Jiangsu, No. 10 Patentee before: Nanjing Puzhen Haitai Brake Equipment Co., Ltd. |