CN210146209U - Vibration monitoring and controlling device for vertical mill equipment - Google Patents
Vibration monitoring and controlling device for vertical mill equipment Download PDFInfo
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- CN210146209U CN210146209U CN201920746725.3U CN201920746725U CN210146209U CN 210146209 U CN210146209 U CN 210146209U CN 201920746725 U CN201920746725 U CN 201920746725U CN 210146209 U CN210146209 U CN 210146209U
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Abstract
The utility model belongs to the technical field of immediately, concretely relates to vibration monitoring control device for immediately grinding equipment. The utility model discloses aim at solving the relatively poor, the less problem of early warning situation of monitoring comprehensiveness of the monitoring mode of current vertical mill equipment. The utility model discloses a vibration monitoring control device can acquire the vibration signal who immediately grinds body and drive arrangement of equipment of founding to can report to the police or even make drive arrangement bring to rest when the vibration state that judges this monitoring position through the vibration signal of every monitoring position appears unusually. The vibration state of the vertical mill body is monitored on the basis of real-time monitoring and autonomous protection control of the vibration state of the vertical mill body, so that corresponding protection is performed when the driving device vibrates abnormally and tends to cause severe vibration of the vertical mill body. The staff is not required to operate and control constantly, and the labor cost is reduced. The comprehensive monitoring of the opposite grinding equipment is guaranteed, and the protection effect of the opposite grinding equipment is improved.
Description
Technical Field
The utility model belongs to the technical field of immediately, concretely relates to vibration monitoring control device for immediately grinding equipment.
Background
The vertical mill is a grinding device integrating fine crushing, drying, grinding, powder selecting and conveying, and is widely applied to grinding and superfine grinding of various solid materials in the industries of cement, building materials, electric power, metallurgy, chemical industry, non-metal ores and the like. The vertical mill device generally comprises a vertical mill body for performing milling work and a driving system for providing a power source for the vertical mill body, wherein the stable operation of the vertical mill body is the basis for the safe operation of the vertical mill device. Regarding the common fault type of the existing vertical mill body, the main fault causes that the vibration state of the vertical mill body is too violent, so that the mechanical performance of the vertical mill body is reduced, even the vertical mill body is damaged, and the like, so that the whole vertical mill equipment cannot normally operate.
At present, aiming at the problems, the mode of monitoring the vibration state of the vertical mill body is generally adopted to prevent the vertical mill body from entering a violent vibration state. The monitoring method has the disadvantage that on one hand, a worker can take corresponding measures when the vertical mill body vibrates abnormally only by checking the vibration state of the vertical mill body constantly. On the other hand, the monitoring mode is difficult to find the vibration condition of the power source of the vertical mill equipment, and is difficult to give early warning for the abnormal vibration condition of the vertical mill body caused by the abnormal vibration of the power source, so that the monitoring comprehensiveness is poor.
Accordingly, there is a need in the art for a new vibration monitoring and control device for a vertical mill apparatus that addresses the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems in the prior art, i.e. to solve the problems of poor monitoring comprehensiveness and less early warning situations of the monitoring mode of the existing vertical mill equipment, the utility model provides a vibration monitoring and controlling device for the vertical mill equipment, the vertical mill equipment comprises a vertical mill body and a driving device connected with the vertical mill body, the vibration monitoring and controlling device comprises a signal acquisition module and a control module connected with the signal acquisition module, the signal acquisition module comprises a first vibration sensor, the first vibration sensor is connected with the vertical mill body so as to detect the vibration signal of the vertical mill body, the control module can judge whether the vibration state of the vertical mill body is abnormal or not according to the vibration signal detected by the first vibration sensor and stop the driving device when the vibration of the vertical mill body is abnormal, the signal acquisition module further comprises a second vibration sensor connected with the driving device, and the second vibration sensor is used for detecting a vibration signal of the driving device and sending the detected signal to the control module so that the control module can control the driving device to stop running when the driving device vibrates abnormally.
In a preferred technical solution of the above vibration monitoring and controlling device, the signal acquisition module further includes a signal input unit connected to the first vibration sensor and the second vibration sensor, and the signal input unit can input the vibration signals acquired by the first vibration sensor and the second vibration sensor to the control module.
In an optimal technical scheme of the vibration monitoring and controlling device, the driving device is a motor driving device, the motor driving device includes a driving end connected to the vertical mill body and a non-driving end opposite to the driving end, and the two second vibration sensors are respectively disposed on the driving end and the non-driving end.
In a preferred technical solution of the above vibration monitoring and controlling apparatus, the signal input unit is an analog signal input unit, the vibration monitoring and controlling apparatus further includes an analog signal output unit, and the control module is connected to the driving apparatus through the analog signal output unit.
In a preferred technical solution of the above vibration monitoring and controlling device, the vibration monitoring and controlling device further includes a circuit amplifier connected to the analog signal input unit, an analog-to-digital converter connected to the circuit amplifier, and a digital-to-analog converter connected to the analog signal output unit, and the analog-to-digital converter and the digital-to-analog converter are further connected to the control module, respectively.
In the preferable technical solution of the vibration monitoring and controlling device, the vibration monitoring and controlling device further includes a parameter setting module connected to the control module, the control module includes a storage unit, and the storage unit can store historical monitoring data and preset parameters written in by the parameter setting module.
In a preferred technical solution of the above vibration monitoring and controlling apparatus, the control module is a CPU module.
In the preferred technical solution of the vibration monitoring and controlling device, the parameter setting module is an input key or a touch device; or the parameter setting module is communication equipment in communication connection with the control module.
In the preferable technical scheme of the vibration monitoring and controlling device, the vibration monitoring and controlling device further comprises an external monitoring module connected with the control module, and the external monitoring module can display the vibration states of the vertical mill body and the driving device.
In the preferable technical scheme of the vibration monitoring and controlling device, the vibration monitoring and controlling device further comprises an alarm module connected with the control module, and the control module can also make the alarm module give an alarm at the initial stage of abnormal vibration of the vertical mill body and/or the driving device.
The technical personnel that can understand in the field can understand, the utility model discloses a vibration monitoring control device for standing mill equipment can acquire the vibration signal who stands mill body and drive arrangement to can judge through vibration signal and stand mill body and/or drive arrangement's vibration state makes drive arrangement stall when appearing unusually, thereby makes and stands mill equipment stall, avoids standing mill body or drive arrangement to damage. Through above-mentioned device, not only can realize the vibration state's of opposition mill body real-time supervision and autonomic protection control, can also monitor to the vibration state of the drive arrangement that the drive founds the mill body operation to corresponding safeguard measure is taken in this drive arrangement vibration anomaly, when having the tendency that leads to the violent vibration of founding the mill body automatically. Both need not the staff and control constantly, reduced the human labor cost, guaranteed the comprehensive control of opposition mill equipment again, promoted the protective effect of opposition mill equipment.
Further, drive arrangement is motor drive arrangement, this motor drive arrangement include with found the drive end that the mill body links to each other and with the opposite non-drive end of drive end, be provided with a second vibration sensor on drive end and the non-drive end respectively to vibration monitoring control device can monitor the vibration state of a plurality of positions of motor drive arrangement, precision and sensitivity when having improved monitoring drive arrangement's whole vibration state, further promoted vibration monitoring control device's barrier propterty.
Preferably, the utility model discloses a vibration monitoring control device still includes the parameter setting module that links to each other with control module, and above-mentioned control module includes the memory cell, and this memory cell can save the parameter setting module and write in predetermine the parameter to the staff can modify vibration monitoring control device's settlement parameter, adjustment vibration monitoring control device's regulation and control standard through the parameter setting module, makes vibration monitoring control device can more match with the actual operational environment who founds grinding equipment, and the protecting effect is better.
Preferably, the utility model discloses a vibration monitoring control device still includes the outside monitoring module who links to each other with control module for the staff can look up in real time through outside monitoring module and immediately grind body and drive arrangement's vibration state.
Preferably, the utility model discloses a vibration monitoring control device still includes the alarm module who links to each other with control module, and control module can also make alarm module report to the police at the unusual initial stage of mill body and/or drive arrangement vibration to remind the staff in advance to found the mill equipment strong unusual vibration condition can appear, make the staff can reserve the judgement to the trouble of the probably appearing of mill equipment, reserve the time of inspection and timely correction for the staff.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The attached drawings are as follows:
fig. 1 is a schematic working diagram of the vibration monitoring and controlling device of the present invention;
fig. 2 is a schematic structural diagram of the device main body of the vibration monitoring and controlling device of the present invention.
In the drawings: 1. vertically grinding the body; 2. a motor drive device; 3. a vibration monitoring control device; 31. a device main body; 311. an analog signal input unit; 312. a circuit amplifier; 313. an analog-to-digital converter; 314. a CPU module; 3141. a storage unit; 315. a digital-to-analog converter; 316. an analog signal output unit; 317. an alarm module; 318. an operation key input; 319. an input end of a touch device; 32. a first vibration sensor; 33. a second vibration sensor.
Detailed Description
It is to be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring first to fig. 1, fig. 1 is a schematic diagram of the vibration monitoring and controlling apparatus according to the present invention. As shown in fig. 1, the vertical mill device includes two parts, namely a vertical mill body 1 and a driving device, wherein the vertical mill body 1 is a mechanism whole body for transporting and grinding materials, for example, the vertical mill body 1 includes a housing, a vertical mill support, a transmission mechanism, a grinding disc, a grinding roller, a feeding structure, a conveying structure, and the like. The driving device is connected with the grinding disc so as to provide power for the vertical mill body 1 and drive the vertical mill body 1 to operate. Further, the driving device is a motor driving device 2, the transmission mechanism of the vertical mill body 1 at least comprises a speed reducer, and the motor driving device 2 is connected to the grinding disc through the speed reducer.
The technical scheme of the utility model is explained by combining the vertical mill equipment.
The utility model discloses a control module that is used for standing vibration monitoring control device of grinding equipment to include signal acquisition module and links to each other with signal acquisition module. The signal acquisition module comprises a first vibration sensor 32 connected with the vertical mill body 1 and a second vibration sensor 33 connected with the motor driving device 2, so that the first vibration sensor 32 and the second vibration sensor 33 can respectively acquire vibration signals of the vertical mill body 1 and the motor driving device 2 when the vertical mill device runs. After the first vibration sensor 32 and the second vibration sensor 33 send the vibration signals to the control module, the control module can judge whether the vibration states of the vertical mill body 1 and the motor driving device 2 are abnormal according to the vibration signals acquired by the first vibration sensor 32 and the second vibration sensor 33, and stop the motor driving device 2 when any one of the vertical mill body 1 and the motor driving device 2 vibrates abnormally, so that the vertical mill equipment stops running, and the vertical mill body 1 or the motor driving device 2 is prevented from being damaged due to violent vibration. The monitoring of the potential vibration source of the opposite mill body 1, namely the motor driving device 2 is increased, the monitoring positions of the vertical mill device are increased, and the protection effect of the opposite mill device is improved.
The vibration signal of the vertical mill body 1 acquired by the first vibration sensor 32 represents a signal representing a vibration state of the entire vertical mill body 1. When actual operation, the vibration state of each position of grinding body 1 immediately may have the difference, then can acquire immediately and grind the vibration signal that the most violent position of the back condition was sharply shone or appeared vibrating in the most easy appearance on body 1, so that make the utility model discloses a vibration monitoring and control device's protective scope has covered immediately and has ground body 1 wholly in other words. Of course, the first vibration sensor 32 can also acquire the portion of the vertical mill body 1 with the highest vibration monitoring requirement, so as to acquire a vibration signal according to the actual protection requirement of the vertical mill device.
In view of the above, it can be understood by those skilled in the art that, since the purpose of operation of the vertical mill body 1 and the motor driving device 2 is different, and the vibration situation of different parts of the same monitored object is also different, the label for judging whether the vibration signal is abnormal or not is different for the vibration signals acquired at different positions, and those skilled in the art can set the judgment criterion according to the actual signal acquisition scheme. The utility model discloses an in the embodiment, then need set for different judgement standards respectively to vertical mill body 1 and motor drive 2. For example, different upper limit values are set for the amplitude and the number of vibrations per unit time of the vibration signal at different locations, and when the amplitude and the number of vibrations per unit time of the vibration signal exceed the corresponding upper limit values, it is determined that the location is vibrating abnormally.
In the case of monitoring the vertical mill body 1 and the motor drive device 2 at the same time, specifically, the signal acquisition module further includes a signal input unit connected to the first vibration sensor 32 and the second vibration sensor 33. The signal input unit is connected with the control module so as to input vibration signals of the vertical mill body 1 and the motor driving device 2 into the control module.
Further, the motor drive device 2 includes a drive end (i.e., an end close to the torque output shaft) connected to the vertical mill body and a non-drive end (i.e., an end far from the torque output shaft) opposite to the drive end. The number of the second vibration sensors 33 is two, and one second vibration sensor 33 is provided on each of the driving end and the non-driving end, so that the vibration states of the driving end and the non-driving end of the motor drive device 2 can be simultaneously monitored. Through the arrangement, as long as any one of the vertical mill body 1, the driving end and the non-driving end is abnormal in vibration, the control module can control the motor driving device 2 to stop running, and the protection standard of the vertical mill equipment is further improved.
It should be noted that although the above embodiment is described in conjunction with the three vibration signal acquisition positions of the vertical mill body 1, the driving end and the non-driving end, this is not limitative. The number and the specific position of the acquisition positions of the vibration signals are not limited to the above examples. In addition, when the kind of the motor drive device 2 is changed, if the motor drive device 2 is a hydraulic drive device, the vibration monitoring portion of the drive device can be adjusted appropriately. The change of the monitoring position does not exceed the principle and the protection scope of the utility model.
Referring to fig. 2 and continuing to refer to fig. 1, fig. 2 is a schematic structural diagram of a device body of the vibration monitoring and controlling device of the present invention. As shown in fig. 1 and 2, the signal input unit is an analog signal input unit 311. The utility model discloses a vibration monitoring control device still includes the circuit amplifier 312 that links to each other with analog signal input unit 311, the analog-to-digital converter 313 that links to each other with circuit amplifier 312, analog signal output unit 316 and the digital-to-analog converter 315 that links to each other with analog signal output unit 316. The analog-to-digital converter 313 and the digital-to-analog converter 315 are also connected to the control module, respectively. The control module is connected to the control section of the motor drive device 2 through an analog signal output unit 316. In the operating state, the first vibration sensor 32 and the second vibration sensor 33 respectively collect vibration signals of the driving end and the non-driving end of the vertical mill body 1 and the motor driving device 2. The analog signal input unit 311 transmits the collected vibration signal to the circuit amplifier 312, so that the vibration signal can be amplified and converted into an analog signal by analog-to-digital conversion and then transmitted to the control module. The control module judges whether each vibration signal is abnormal according to a preset vibration signal judgment standard, sends a switching value signal of the motor driving device 2 when any vibration signal is abnormal, converts the switching value signal into an analog signal through a digital-to-analog converter, and transmits the analog signal to a driving part of the motor driving device 2 through the analog signal output unit 316, so that the motor driving device 2 is controlled to stop running.
Further, the control module is a CPU module 314. The CPU module 314 further includes a storage unit 3141 to store data related to the above-described determination criterion. Meanwhile, the storage unit 3141 may also store historical monitoring data, so that a worker can know the normal state of vibration during operation of the vertical mill equipment, and the worker can make a reasonable optimization scheme for monitoring work or improving work of the vertical mill equipment through the historical monitoring data.
Furthermore, the analog signal input unit 311, the circuit amplifier 312, the analog-to-digital converter 313, the CPU module 314, the storage unit 3141, the digital-to-analog converter 315, and the analog signal output unit 316 are all integrated on a circuit board to form the device main body 31 of the vibration monitoring and controlling device, so as to improve the installation convenience and the maintenance convenience of the vibration monitoring and controlling device.
In the above embodiment, the structural composition of the apparatus main body 31 is not limited, and for example, the analog signal or the switching value signal between the analog signal input unit 311, the control module, and the analog signal output unit 316 may be transmitted by a communication method. For example, the analog signal input unit 311, the control module, and the analog signal output unit 316 are respectively provided with an RS485/RS232 interface for transmitting signals in Profibus and Modbus communication, or the analog signal input unit 311, the control module, and the analog signal output unit 316 are respectively provided with an ethernet interface for transmitting signals in Modbus TCP/IP and Profinet TCP/IP communication. That is, whether direct transmission or indirect transmission through a communication device or a signal transmission element, a signal transmission scheme may be provided as long as the signal transmission scheme can satisfy the signal transmission requirements among the analog signal input unit 311, the control module, the analog signal output unit 316, and the control portion of the motor drive apparatus 2.
Preferably, the utility model discloses a vibration monitoring control device still includes the parameter setting module (not shown in the figure) that links to each other with CPU module 314, and the staff can write in storage unit 3141 with the relevant parameter of predetermineeing of judgement standard through this parameter setting module to the staff can adjust vibration monitoring control device's protection standard at any time according to the equipment behavior of reality.
As a specific embodiment, the parameter setting module is an input key (e.g. a keyboard or a plurality of operation keys connected to the CPU module 314). In this case, the utility model discloses a vibration monitoring control device can also dispose the display screen that can show the parameter information of typing to the staff can be through the mode setting of typing the data and predetermine the parameter.
As an alternative embodiment, the parameter setting module is a touch device, such as a touch display screen or a touch projection screen, so that the worker can input the preset parameters by touch.
As yet another alternative, the parameter setting module is a communication device capable of being connected to the CPU module 314 in a communication manner, and the operator inputs preset parameters through the communication device.
Preferably, the utility model discloses a vibration monitoring control device still includes the outside monitoring module (not shown in the figure) that links to each other with CPU module 314, and this outside monitoring module can show the vibration state who founds mill body 1 and motor drive 2's drive end and non-drive end, if found the vibration curve of each monitoring position during the operation of mill equipment, the staff of being convenient for looks up at any time and founds the whole vibration state of mill equipment.
The utility model discloses an among the preferred embodiment, above-mentioned vibration monitoring control device still includes the alarm module who links to each other with CPU module 314, and CPU module 314 can also make alarm module report to the police in the arbitrary initial stage that appears unusually vibrating in the drive end of grinding body 1, motor drive 2 and the non-drive end immediately to remind the staff to counter the mill equipment to overhaul through the mode of trouble early warning.
Specifically, the "initial stage of the abnormal vibration" refers to a period immediately after the vibration of the vertical mill body 1 and the motor drive device 2 starts to exceed an expected standard. For example, an upper limit preset parameter and a lower limit preset parameter of a determination criterion of the abnormal vibration are set, and once a parameter of a vibration signal at any one of the driving end and the non-driving end of the vertical mill body 1 and the motor driving device 2 rises to the lower limit preset parameter, an alarm is started. If the parameter of the vibration signal at the vibration abnormal position continues to rise to the upper limit preset parameter, the motor drive device 2 is turned off.
To sum up, the utility model discloses a vibration monitoring control device can acquire the vibration signal who immediately grinds body 1 and motor drive 2's drive end and non-drive end to can report to the police or even make motor drive 2 stall when the vibration state that judges this monitoring position through the vibration signal of every monitoring position appears unusually, thereby immediately grind body 1 or motor drive 2 and can in time break away from violent vibration state, reduced and immediately ground body 1 and motor drive 2's fault rate.
So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims (10)
1. A vibration monitoring and controlling device for vertical mill equipment comprises a vertical mill body and a driving device connected with the vertical mill body, the vibration monitoring and controlling device comprises a signal acquisition module and a control module connected with the signal acquisition module, the signal acquisition module comprises a first vibration sensor, the first vibration sensor is connected with the vertical mill body so as to detect a vibration signal of the vertical mill body, the control module can judge whether the vibration state of the vertical mill body is abnormal or not according to the vibration signal detected by the first vibration sensor and stop the driving device when the vibration of the vertical mill body is abnormal,
the signal acquisition module is characterized by further comprising a second vibration sensor connected with the driving device, wherein the second vibration sensor is used for detecting a vibration signal of the driving device and sending the detected signal to the control module so that the control module can control the driving device to stop running when the driving device vibrates abnormally.
2. The vibration monitoring and controlling device according to claim 1, wherein the signal acquisition module further comprises a signal input unit connected to the first vibration sensor and the second vibration sensor,
the signal input unit can input the vibration signals collected by the first vibration sensor and the second vibration sensor to the control module.
3. The vibration monitoring and controlling device according to claim 2, wherein the driving device is a motor driving device, the motor driving device includes a driving end connected to the vertical mill body and a non-driving end opposite to the driving end, and the two second vibration sensors are respectively disposed on the driving end and the non-driving end.
4. The vibration monitoring and control device according to claim 2, wherein the signal input unit is an analog signal input unit, the vibration monitoring and control device further comprises an analog signal output unit, and the control module is connected to the driving device through the analog signal output unit.
5. The vibration monitoring and control device according to claim 4, further comprising a circuit amplifier connected to the analog signal input unit, an analog-to-digital converter connected to the circuit amplifier, and a digital-to-analog converter connected to the analog signal output unit, wherein the analog-to-digital converter and the digital-to-analog converter are further connected to the control module respectively.
6. The vibration monitoring and controlling device according to claim 2, further comprising a parameter setting module connected to the control module, wherein the control module comprises a storage unit capable of storing historical monitoring data and preset parameters written by the parameter setting module.
7. The vibration monitoring and control device of claim 6, wherein the control module is a CPU module.
8. The vibration monitoring and controlling device according to claim 6, wherein the parameter setting module is an input key or a touch device; or
The parameter setting module is communication equipment in communication connection with the control module.
9. The vibration monitoring and controlling device as claimed in claim 2, further comprising an external monitoring module connected to the control module, wherein the external monitoring module is capable of displaying the vibration states of the vertical mill body and the driving device.
10. The vibration monitoring and control device according to any one of claims 1 to 9, further comprising an alarm module connected to the control module, wherein the control module is further capable of alarming the alarm module at the beginning of abnormal vibration of the vertical mill body and/or the driving device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920746725.3U CN210146209U (en) | 2019-05-22 | 2019-05-22 | Vibration monitoring and controlling device for vertical mill equipment |
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| CN201920746725.3U CN210146209U (en) | 2019-05-22 | 2019-05-22 | Vibration monitoring and controlling device for vertical mill equipment |
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Cited By (3)
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| CN113988202A (en) * | 2021-11-04 | 2022-01-28 | 季华实验室 | Mechanical arm abnormal vibration detection method based on deep learning |
| CN113996409A (en) * | 2021-10-21 | 2022-02-01 | 山东鑫海矿业技术装备股份有限公司 | Remote control method and equipment of vortex crusher based on equipment state |
| CN115090378A (en) * | 2022-08-26 | 2022-09-23 | 启东市春晨机械有限公司 | Abnormal vibration monitoring and early warning method for hammer head rotor of metal crusher |
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2019
- 2019-05-22 CN CN201920746725.3U patent/CN210146209U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113996409A (en) * | 2021-10-21 | 2022-02-01 | 山东鑫海矿业技术装备股份有限公司 | Remote control method and equipment of vortex crusher based on equipment state |
| CN113988202A (en) * | 2021-11-04 | 2022-01-28 | 季华实验室 | Mechanical arm abnormal vibration detection method based on deep learning |
| CN115090378A (en) * | 2022-08-26 | 2022-09-23 | 启东市春晨机械有限公司 | Abnormal vibration monitoring and early warning method for hammer head rotor of metal crusher |
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Effective date of registration: 20220523 Address after: 100000 room 1201, Ganjiakou building, No. 17, Sanlihe Road, Haidian District, Beijing Patentee after: Sinoma overseas technology development Co.,Ltd. Address before: 100037 12 / F, Ganjiakou building, 17 Sanlihe Road, Haidian District, Beijing Patentee before: SINOMA OVERSEAS DEVELOPMENT CO.,LTD. |