CN106115220B - Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake - Google Patents
Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake Download PDFInfo
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- CN106115220B CN106115220B CN201610677022.0A CN201610677022A CN106115220B CN 106115220 B CN106115220 B CN 106115220B CN 201610677022 A CN201610677022 A CN 201610677022A CN 106115220 B CN106115220 B CN 106115220B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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Abstract
The invention belongs to Engineering Control technical field, there is provided control system is selected in sand washing more than a kind of lake river polluted bed mud processing automatic sensing speed governing.In the present invention, by using including induction installation, control system is selected in sand washing more than the lake river polluted bed mud processing automatic sensing speed governing of RHVC and control device, so that induction installation sensing puies forward the interior sand material height of sand hopper, and corresponding induced signal is fed back to control device, control device is adjusted the running speed of elevator to preset value according to actuated signal control RHVC, and then realize the running speed that elevator is automatically adjusted according to sand doses, so that it keeps matching in real time with the disposal ability of sand washer, and it ensure that the stabilization of system operation, and be not in spill, phenomena such as unbalanced, fluctuation of service be present so as to solve existing remaining sand washing system, and easily occur spilling and the problem of unbalanced phenomena.
Description
Technical field
The invention belongs to Engineering Control technical field, more particularly to a kind of lake river polluted bed mud processing automatic sensing to adjust
Control system is selected in sand washing more than speed.
Background technology
At present, the sand that sand washing choosing will mainly be extracted by elevator from riverbed sludge more than existing riverbed sludge processing
Material is transported to progress washed-out sand processing in sand washer.However, due to existing riverbed sludge processing more than sand washing system can not be automatic
Judge and adjust the running speed of elevator, cause the feeding amount size of elevator indefinite, in turn result in remaining sand washing system production
Small when big during amount, system operation is unstable, and phenomena such as occur and spill, be unbalanced.
In summary, there is fluctuation of service and easily occur spilling and unbalanced phenomena in existing remaining sand washing system
Problem.
The content of the invention
It is an object of the invention to provide a kind of lake river polluted bed mud processing automatic sensing speed governing more than sand washing selected control system
System, it is intended to solve existing remaining sand washing system and fluctuation of service be present and easily occur spilling to ask with unbalanced phenomena
Topic.
The present invention is achieved in that sand washing selected control system more than a kind of lake river polluted bed mud processing automatic sensing speed governing
System, more than the lake river polluted bed mud processing automatic sensing speed governing sand washing select control system to be used for the operating speed for adjusting elevator
Degree, more than the lake river polluted bed mud processing automatic sensing speed governing sand washing select control system to include：Induction installation, frequency control
Device and control device；
The induction installation includes the first induction installation and the second induction installation, and first induction installation is arranged on described
The first height and position for carrying sand hopper of elevator, second induction installation are arranged on second height and position for carrying sand hopper,
The induction installation is used to sense the sand material height put forward in sand hopper, and feeds back corresponding induced signal to the control dress
Put；Control device RHVC according to the actuated signal control adjusts the running speed of the elevator
To preset value；Wherein, first height and position is less than second height and position.
In the present invention, it is dirty by using the lake creek including induction installation, RHVC and control device
Control system is selected in sand washing more than dye sludge handling automatic sensing speed governing so that and induction installation sensing puies forward the sand material height in sand hopper, and
Corresponding induced signal is fed back to control device, and control device is according to actuated signal control RHVC by the fortune of elevator
Rotary speed is adjusted to preset value, and then realizes the running speed that elevator is automatically adjusted according to sand doses, so that itself and sand washer
Disposal ability keep matching in real time, and ensure that the stabilization of system operation, and be not in phenomena such as spilling, be unbalanced,
So as to solve the problems, such as that existing remaining sand washing system has fluctuation of service and easily occurs spilling and unbalanced phenomena.
Brief description of the drawings
Fig. 1 is that the lake river polluted bed mud that one embodiment of the invention is provided handles sand washing selected control more than automatic sensing speed governing
The modular structure schematic diagram of system processed.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It is described in detail below in conjunction with realization of the specific accompanying drawing to the present invention：
Fig. 1 shows that the lake river polluted bed mud that one embodiment of the invention is provided handles sand washing more than automatic sensing speed governing
The modular structure of control system 10 is selected, for convenience of description, the part related to the embodiment of the present invention is illustrate only, is described in detail such as
Under：
Sand washing selects control system 10 to be used for more than the lake river polluted bed mud processing automatic sensing speed governing that the present embodiment provides
Adjust the running speed of elevator (not shown).As shown in figure 1, the lake river polluted bed mud processing that the present embodiment provides
Sand washing selects control system 10 to include induction installation 100, RHVC 102 and control device 101 more than automatic sensing speed governing.
Wherein, induction installation 100 includes the first induction installation 100a and the second induction installation 100b, the first induction installation
100a is arranged on the first height and position for carrying sand hopper of elevator, and the second induction installation 100b is arranged on the second height for carrying sand hopper
Position, induction installation 100 senses the sand material height put forward in sand hopper, and feeds back corresponding induced signal to control device 101；Control
Device 101 is adjusted the running speed of elevator to preset value according to actuated signal control RHVC 102；Wherein,
One height and position is less than the second height and position；It should be noted that in the present embodiment, the first height and position and the second height position
Putting can need to be configured according to user.
Specifically, when carrying the sand material in sand hopper and highly reaching the first height and position, the first induction installation 100a feedbacks the
One induced signal to control device 101, control device 101 will lifting according to the first actuated signal control RHVC 102
The running speed of machine is reduced to the first preset value.
For example, the first height and position refers to carrying sand hopper half height and position, the second height and position refers to carrying sand
Struggle against 2/3rds height and positions；And when carry the sand material in sand hopper highly reach put forward sand hopper half position height when, first sense
Answer device 100a to sense sand material height and position, and feed back the first induction information to control device 101, control device 101 and receive
The first control information is generated according to first induction information during the first induction information of the first induction installation 100a feedbacks, and should
First control information is sent to RHVC 102, so that the RHVC 102 will carry according to first control information
The running speed of the machine of liter is adjusted to the first preset value, and first preset value can be actually needed according to user to be configured, and
First preset value is less than the initial value of elevator, i.e., the sand material height and position that ought be carried in sand hopper is high positioned at sand hopper half is put forward
When spending position, the initial operation speed when running speed of elevator is started working less than elevator.
It is worth noting that, in the present embodiment, after elevator is operated with the running speed of the first preset value, if
The sand material in sand hopper is carried highly without before reaching the second height and position, elevator keeps the running speed of the first preset value.
Further, when carrying the sand material in sand hopper and highly reaching the second height and position, the second induction installation feedback second
Induced signal is to control device, and control device is according to the second actuated signal control RHVC by the running speed of elevator
It is reduced to the second preset value；Wherein, the second preset value is less than the first preset value.
For example, working as the sand discharge position put forward in sand hopper reaches 2/3rds height and positions for carrying sand hopper, that is, carry sand material in sand hopper
Height reach the second height and position when, now the second induction installation 100b sense sand material height and position, and feed back second sensing
Information is to control device 101, according to this when control device 101 receives the second induction information of the second induction installation 100b feedbacks
Second induction information generates the second control information, and second control information is sent to RHVC 102, so that the change
Frequency modulation speed variator 102 is adjusted the running speed of elevator to the second preset value according to second control information, and this is second default
Value can be actually needed according to user and be configured, and second preset value is less than the first preset value, i.e., ought carry in sand hopper
Sand expects that the running speed of elevator is less than the running speed after preceding Primary regulation up to when carrying 2/3rds height and position of sand hopper,
The sand material height and position that running speed after the preceding Primary regulation refers to carrying in sand hopper, which reaches, carries sand hopper half height position
The running speed of elevator when putting.
It is worth noting that, in the present embodiment, after elevator is operated with the running speed of the second preset value, if
The sand material carried in sand hopper is highly not below before the second height and position, and elevator keeps the running speed of the second preset value.
Further, when carrying the sand material in sand hopper and highly falling after rise to the second height and position, the second induction installation 100b is anti-
Presenting the 3rd induced signal to control device 101, control device 101 will according to the 3rd actuated signal control RHVC 102
The running speed of elevator is promoted to the first preset value.
For example, fallen after rise when put forward sand discharge position in sand hopper from higher than 2/3rds height and positions for carrying sand hopper to carrying sand hopper
2/3rds height and positions, that is, when carrying the sand material in sand hopper and highly falling after rise to the second height and position, now the second induction installation
100b senses sand material height and position, and feeds back the 3rd induction information to control device 101, control device 101 and receive the second sense
The 3rd control information is generated according to the 3rd induction information during three induction information for answering device 100b to feed back, and the 3rd is controlled
Information processed is sent to RHVC 102 so that the RHVC 102 according to the 3rd control information by elevator
Running speed is promoted to the first preset value, i.e., when putting forward the sand material position in sand hopper when 2/3rds height and position of sand hopper is carried, is lifted
The running speed of machine is higher than the running speed after preceding Primary regulation, and the running speed after the preceding Primary regulation refers to carrying in sand hopper
Sand material height and position be higher than the running speed of elevator when carrying 2/3rds height and position of sand hopper, that is to say, that this is preceding once
Running speed after regulation refers to the second preset value.
Further, when carrying the sand material in sand hopper and highly falling after rise to the first height and position, the first induction installation 100a is anti-
Presenting the 4th induced signal to control device 101, control device 101 will according to the 4th actuated signal control RHVC 102
The running speed of elevator is promoted to initial value.
For example, fallen after rise when put forward sand discharge position in sand hopper from higher than the half height and position for carrying sand hopper to carrying sand hopper
Half height and position, that is, when carrying the sand material in sand hopper and highly falling after rise to the first height and position, now the first induction installation
100a senses sand material height and position, and feeds back the 4th induction information to control device 101, control device 101 and receive the first sense
The 4th control information is generated according to the 4th induction information during four induction information for answering device 100a to feed back, and the 4th is controlled
Information processed is sent to RHVC 102 so that the RHVC 102 according to the 4th control information by elevator
Running speed is promoted to initial value, i.e., when carry the sand material in sand hopper highly positioned at carry sand hopper half height and position when, lifting
The running speed of machine is higher than the running speed after preceding Primary regulation, and the running speed after the preceding Primary regulation refers to carrying in sand hopper
Sand material height and position be higher than the running speed of elevator when carrying sand hopper half height and position, that is to say, that this is preceding once
Running speed after regulation refers to the first preset value.
It should be noted that in the present embodiment, the sense that the first induction installation 100a and the second induction installation 100b are sent
Induction signal is analog signalses, and control device 101 can be generated directly after receiving the analog signalses according to the analog signalses
Corresponding control signal, generated accordingly according to digital quantity signal after the analog signalses can also be converted to digital quantity signal
Control signal.
Further, as a preferred embodiment of the invention, induction installation 100 is infrared sensing switch.When sensing fills
When to put 100 be infrared sensing switch, because infrared sensing switch is that different induction informations is exported according to the intensity of infrared light
, therefore, when carrying the sand material in sand hopper and highly reaching first position height, positioned at the first infrared induction of first position height
The infrared part that infrared transmitting tube in switch is sent is absorbed by sand material, infrared in the first infrared sensing switch so as to cause
The infra-red intensity that reception pipe receives reduces, and the infra-red intensity received with infrared receiving tube reduces, and infrared receiving tube is outside
Feedback-induced information, i.e. the first infrared sensing switch can feed back the first induced signal to control device 101.
In addition, when carrying the sand material in sand hopper and highly reaching second place height, second positioned at second place height is red
The infrared part that infrared transmitting tube in outer inductive switch is sent is absorbed by sand material, so as to cause in the second infrared sensing switch
Infrared receiving tube receive infra-red intensity reduce, with infrared receiving tube receive infra-red intensity reduce, infrared receiver
Outside feedback-induced information is managed, i.e. the second infrared sensing switch can feed back the second induced signal to control device 101.
Further, when carrying the sand material in sand hopper and highly falling after rise to the second height and position, due to the stop of no sand material,
The infrared ray that infrared transmitting tube in the second infrared sensing switch of second place height is sent is most of by infrared receiver
Pipe receives, and then the infra-red intensity enhancing that infrared receiving tube is received, the infra-red intensity received with infrared receiving tube
Enhancing, the outside feedback-induced information of infrared receiving tube, i.e. the second infrared sensing switch can feed back the 3rd sensing to control device 101
Signal；It should be noted that when carrying the sand material in sand hopper and highly falling after rise to the first height and position, the first infrared sensing switch
Operation principle is highly fallen after rise to the operation principle phase of the second infrared sensing switch during the second height and position with carrying the sand material in sand hopper
Together, therefore, here is omitted.
Further, as a preferred embodiment of the invention, induction installation 100 is photoelectric sensor switch.When sensing fills
When to put 100 be photoelectric sensor switch, because photoelectric sensor switch is that the optical signal of sensing is converted into electric signal, and then further according to
Electric signal feeds back corresponding induced signal, therefore, when carrying the sand material in sand hopper and highly reaching first position height, positioned at first
The light intensity of the first photoelectric sensor switch sensing of position height reduces, and now, the first photoelectric sensor switch can be by sensing
Light intensity is converted to the first electric signal, and according to the outside induced signal of feedback-induced first of first electric signal, i.e. the first light
Inductance inductive switch can feed back the first induced signal to control device 101.
In addition, when carrying the sand material in sand hopper and highly reaching second place height, positioned at the second light of second place height
The light intensity of electric induction inductive switching reduces, and now, the second photoelectric sensor switch can be converted to the light intensity of sensing the
Two electric signals, and can be to control according to the outside induced signal of feedback-induced second of second electric signal, i.e. the second photoelectric sensor switch
Device 101 processed feeds back the second induced signal.
Further, when carrying the sand material in sand hopper and highly falling after rise to the second height and position, due to the stop of no sand material,
The light intensity enhancing sensed positioned at the second photoelectric sensor switch of second place height, now, the second photoelectric sensor switch can
The light intensity of sensing is converted into the 3rd electric signal, and according to the outside induced signal of feedback-induced the 3rd of the 3rd electric signal,
That is the second photoelectric sensor switch can feed back the 3rd induced signal to control device 101；It should be noted that work as the sand carried in sand hopper
When material height is fallen after rise to the first height and position, the operation principle of the first photoelectric sensor switch highly falls after rise with the sand material carried in sand hopper
Operation principle to the second photoelectric sensor switch during the second height and position is identical, and therefore, here is omitted.
In addition, as a preferred embodiment of the invention, induction installation 100 can also be capacitance-sensitive switch.Work as sensing
When device 100 is capacitance-sensitive switch, its operation principle is identical with existing capacitive sensing operation principle, therefore, herein no longer
Repeat.
Further, as a preferred embodiment of the invention, RHVC 102 is frequency converter.Wherein, the frequency conversion
Device mainly controls the running speed of the ac motor in elevator by changing motor working power Frequency Patterns.Specifically
, the frequency converter include by rectification unit (AC-DC), filter unit, inversion unit (direct current become exchange), brake unit,
Driver element, detection unit and microprocessing unit etc. form.Switching tube cut-offs to adjust out-put supply frequency converter close to the inner portion
Voltage and frequency, and being actually needed to provide the supply voltage required for it according to motor, and then save, speed governing
Purpose.
Further, as a preferred embodiment of the invention, control device 101 is programmable logic controller (PLC), and this can
Programmed logic controller include but is not limited to field programmable gate array (Field-Programmable Gate Array,
FPGA) processor, arm processor or single-chip microcomputer；It should be noted that in the present embodiment, the programmable logic controller (PLC)
It is arranged in the automatic control system that remaining sand washing is chosen.
In the present invention, by using the lake for including induction installation 100, RHVC 102 and control device 101
Control system 10 is selected in sand washing more than pool river polluted bed mud processing automatic sensing speed governing so that the sensing of induction installation 100 is carried in sand hopper
Sand material height, and feed back corresponding induced signal to control device 101, control device 101 is according to actuated signal control frequency conversion
Arrangements for speed regulation 102 adjust the running speed of elevator to preset value, and then realize and automatically adjust elevator according to sand doses
Running speed, so that it keeps matching in real time with the disposal ability of sand washer, and the stabilization of system operation is ensure that, and will not
Appearance phenomena such as spilling, be unbalanced, fluctuation of service so as to solve existing remaining sand washing system be present and easily spread
The problem of leakage and unbalanced phenomena.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. control system is selected in sand washing more than a kind of lake river polluted bed mud processing automatic sensing speed governing, it is characterised in that the lake
Sand washing selects control system to be used for the running speed for adjusting elevator, the lake more than pool river polluted bed mud processing automatic sensing speed governing
Sand washing selects control system to include more than pool river polluted bed mud processing automatic sensing speed governing：Induction installation, RHVC and
Control device；
The induction installation includes the first induction installation and the second induction installation, and first induction installation is arranged on the lifting
The first height and position for carrying sand hopper of machine, second induction installation is arranged on second height and position for carrying sand hopper, described
The sand material height in sand hopper is put forward described in induction installation sensing, and feeds back corresponding induced signal to the control device；The control
Device processed RHVC according to the actuated signal control adjusts the running speed of the elevator to preset value；
Wherein, first height and position is less than second height and position.
2. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 1, its
It is characterised by, when the sand material carried in sand hopper highly reaches first height and position, the first induction installation feedback
To the control device, control device frequency control according to first actuated signal control fills first induced signal
Put and the running speed of the elevator is reduced to the first preset value.
3. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 2, its
It is characterised by, when the sand material carried in sand hopper highly reaches second height and position, the second induction installation feedback
To the control device, control device frequency control according to second actuated signal control fills second induced signal
Put and the running speed of the elevator is reduced to the second preset value；Wherein, second preset value is default less than described first
Value.
4. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 3, its
It is characterised by, when the sand material carried in sand hopper is highly fallen after rise to second height and position, second induction installation is anti-
The 3rd induced signal is presented to the control device, control device frequency control according to the 3rd actuated signal control
The running speed of the elevator is promoted to first preset value by device.
5. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 4, its
It is characterised by, when the sand material carried in sand hopper is highly fallen after rise to first height and position, first induction installation is anti-
The 4th induced signal is presented to the control device, control device frequency control according to the 4th actuated signal control
The running speed of the elevator is promoted to initial value by device.
6. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 1, its
It is characterised by, the induction installation is infrared sensing switch.
7. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 1, its
It is characterised by, the induction installation is photoelectric sensor switch.
8. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 1, its
It is characterised by, the RHVC is frequency converter.
9. control system is selected in sand washing more than lake river polluted bed mud processing automatic sensing speed governing according to claim 1, its
It is characterised by, the control device is programmable logic controller (PLC).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610677022.0A CN106115220B (en) | 2016-08-16 | 2016-08-16 | Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake |
| PCT/CN2017/084956 WO2018032825A1 (en) | 2016-08-16 | 2017-05-18 | Automatically-sensing speed-adjusting residual sand washing control system for treatment of polluted sediment in river, lake, or estuary |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610677022.0A CN106115220B (en) | 2016-08-16 | 2016-08-16 | Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106115220A CN106115220A (en) | 2016-11-16 |
| CN106115220B true CN106115220B (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610677022.0A Active CN106115220B (en) | 2016-08-16 | 2016-08-16 | Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106115220B (en) |
| WO (1) | WO2018032825A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106115220B (en) * | 2016-08-16 | 2018-03-16 | 中电建水环境治理技术有限公司 | Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake |
| CN107262270B (en) * | 2017-06-13 | 2019-05-21 | 厦门市建筑科学研究院集团股份有限公司 | A kind of automatic control system purifying sea sand |
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| CN102226874A (en) * | 2011-04-08 | 2011-10-26 | 中交第三航务工程局有限公司 | Measuring subsystem for sand supply and control method |
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| CN105643810A (en) * | 2016-03-21 | 2016-06-08 | 江苏新鹏重型机电制造有限公司 | Dry-mixed mortar production line |
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| KR20040015395A (en) * | 2002-08-12 | 2004-02-19 | 현대자동차주식회사 | A sand mixing device |
| EP2001596A4 (en) * | 2006-03-20 | 2014-02-19 | Parkson Corp | Method and apparatus for washing sand |
| CN203316245U (en) * | 2013-06-26 | 2013-12-04 | 刘雄心 | Continuous flow multiple-type sand washing device |
| CN203944462U (en) * | 2014-06-06 | 2014-11-19 | 泉州德科达机械制造有限公司 | Sea sand zero pollution purifying system |
| CN106115220B (en) * | 2016-08-16 | 2018-03-16 | 中电建水环境治理技术有限公司 | Control system is selected in sand washing more than the river polluted bed mud processing automatic sensing speed governing of lake |
-
2016
- 2016-08-16 CN CN201610677022.0A patent/CN106115220B/en active Active
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2017
- 2017-05-18 WO PCT/CN2017/084956 patent/WO2018032825A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226874A (en) * | 2011-04-08 | 2011-10-26 | 中交第三航务工程局有限公司 | Measuring subsystem for sand supply and control method |
| CN103162306A (en) * | 2011-12-14 | 2013-06-19 | 佛山市国保节能环保技术有限公司 | Coal powder long-range conveying and combustion system |
| CN203566858U (en) * | 2013-11-20 | 2014-04-30 | 中联重科物料输送设备有限公司 | Aggregate feeding system and dry mix mortar station |
| CN105643810A (en) * | 2016-03-21 | 2016-06-08 | 江苏新鹏重型机电制造有限公司 | Dry-mixed mortar production line |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018032825A1 (en) | 2018-02-22 |
| CN106115220A (en) | 2016-11-16 |
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Address after: 518000, Guangdong, Baoan District, Xin'an Xin'an Street 1003 Shenzhen Road, No. six financial port C block Patentee after: China Power Construction Ecological Environment Group Co., Ltd Address before: 518000, Guangdong, Baoan District, Xin'an Xin'an Street 1003 Shenzhen Road, No. six financial port C block Patentee before: The electric environment control technology Co Ltd Jianshui |
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