CN101450762B - Monitoring apparatus for lifting machine - Google Patents
Monitoring apparatus for lifting machine Download PDFInfo
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- CN101450762B CN101450762B CN2007101788394A CN200710178839A CN101450762B CN 101450762 B CN101450762 B CN 101450762B CN 2007101788394 A CN2007101788394 A CN 2007101788394A CN 200710178839 A CN200710178839 A CN 200710178839A CN 101450762 B CN101450762 B CN 101450762B
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Abstract
The invention relates to a monitor for a hoisting machine, which comprises a rotary encoder for detecting displacement of the hoisting machine and outputting impulse signals corresponding to the displacement of the hoisting machine, a control unit for calculating speed of the hoisting machine by using the impulse signals received from the rotary encoder, and a mode selecting module for switching the control unit between a standard mode and an actual operational mode, wherein in the standard mode, the control unit records the calculated speed of the hoisting machine as standard speed, and in the actual operational mode, the control unit compares actual speed of the hoisting machine calculated at a preset position with the standard speed corresponding to the preset position, so that the control unit sends out stop signals to stop the hoisting machine when a difference value of the actual speed and the standard speed is larger than a first threshold value. The monitor has the advantages of simple structure, high precision and wide appliance range.
Description
Technical field
The present invention relates to a kind of monitor that is used for gig, especially relate to the monitor that is used for mining hoist.
Background technology
Gig is as the key equipment in the mine, is mainly used in lifting ore, personnel, material, causes casualties probably or equipment badly damaged, therefore, very high to the security requirement of gig in case have an accident.
In the prior art, the safety of gig is by the main protection function is set in the master control unit of gig.Yet if the main protection function of the master control unit of gig breaks down, gig is prone to accidents.Therefore, require security monitor to be set in addition except in the master control unit of gig, being provided with the main protection function.
For this reason, in the prior art, pit shaft switching regulator monitor, electromechanical monitor etc. the multiple security monitor that is used for gig have appearred, for example.
Pit shaft switching regulator monitor is provided with contact brush switch, travel switch, pit shaft Magnetic Induction switch etc., sends deceleration, parking, pulleying signal by these electric elementss, and the velocity curve that makes gig calculate according to theory thus moves.Yet because the work under bad environment of pitshaft causes the service life of switch short easily, fault is many, difficult in maintenance, check difficulty, switch breaks down and is not easy to find, therefore, in case when hypervelocity appearred in gig, the pit shaft switch can not in time send signal, causes the generation of accident.
The electromechanical monitor is because complicated in mechanical structure has the defective that self is difficult to overcome, and is difficult in maintenance, therefore protects precision lower, and particularly the making difficulty of braking section lobe plate causes cost increase and precision to be difficult to improve.
In addition, existing mine hoist safety monitor adopts the physical computing formula to obtain the protection velocity curve of gig in each stage.The problem that adopts physical equation computation speed (with respect to the position) curve to exist is the protection precision is low; major cause is the influence that gig actual speed curve is subjected to many factors; bigger with the gap that adopts theoretical formula to calculate; for example; though the stroke with gig is divided into each stage in theory, may there be very big error in the stage of a stroke of gig real-world operation with the theoretical stage of dividing.Therefore, with the standard of theoretical formula result calculated as the actual gig real-world operation of protection, the result amplifies protection domain, has reduced the protection precision.For example, when the actual speed of gig did not exceed the standard speed predetermined value, gig may be in dangerous running state, yet, this moment the monitor signal that may be safe from danger, thereby cause the generation of accident.
Summary of the invention
Purpose of the present invention is intended to one of solve the aforementioned problems in the prior at least.
To achieve these goals, embodiments of the invention propose a kind of simple in structure, precision height, the monitor that is used for gig applied widely.
The monitor that is used for gig according to the embodiment of the invention comprises rotary encoder, and this rotary encoder is used to detect displacement and the output and the cooresponding impulse singla of gig displaced phase of gig; Control unit, the impulse singla that this control unit utilization receives from described rotary encoder calculates the speed of gig; And mode selection module, this mode selection module is switch control unit between mode standard and real-world operation pattern, wherein under mode standard, described control unit is a standard speed with the speed record of the gig that calculates, under the real-world operation pattern, described control unit compares the gig that calculates in the actual speed in desired location and standard speed corresponding to described desired location, thus the difference of described actual speed and standard speed during above first threshold described control unit send danger signal so that stop gig.
Equipment according to the embodiment of the invention also has following additional technical feature:
The monitor that is used for gig according to the embodiment of the invention further comprises high speed counting module, this high speed counting module is used to calculate the quantity of the impulse singla of rotary encoder, and wherein said control unit utilizes the quantity of described impulse singla to calculate the speed of gig.
Under mode standard, described control unit calculates the standard speed of each position of gig in a stroke.
Described control unit is with the standard speed of each position of form record gig in a stroke of standard speed curve.
Described rotary encoder is installed on one of the reel of gig, the track adjusting wheel of gig and drive motor of gig.
The monitor that is used for gig according to the embodiment of the invention further comprises alarm unit, when the difference of described actual speed and standard speed during greater than second threshold value described control unit control described alarm unit and give the alarm, wherein second threshold value is less than first threshold.
Described control unit sends to the master control unit of gig with danger signal, so that the master control unit of gig stops to drive the drg that the drive motor of gig starts gig simultaneously.
Described control unit receives gig that master control unit the calculates speed in the desired location from the master control unit of gig, and described control unit compares the speed of gig in the desired location that actual speed and the master control unit of its gig that calculates in the desired location calculates, thus the difference of the speed that calculates at described actual speed and master control unit during above the 3rd threshold value described control unit send danger signal to master control unit.
The monitor that is used for gig according to the embodiment of the invention further comprises alarm unit, the difference of the speed that calculates at described actual speed and master control unit during greater than the 4th threshold value described control unit control alarm unit send warning, wherein the 4th threshold value is less than the 3rd threshold value.
The monitor that is used for gig according to the embodiment of the invention further comprises telltale, is used to show different work pictures.
Compared with prior art, the present invention has one of following advantage at least:
Gig monitor according to the embodiment of the invention; not only the velocity curve that theory is calculated is as the safety guard-safeguard standard of gig real-world operation; and the velocity curve (also can be called the pace of learning curve) that under mode standard gig is normally moved is as protecting standard; therefore monitor of the present invention is also referred to as intelligence learning type monitor; described monitor is simple in structure, and protection precision height does not have misoperation; life-span is long, is not easy to break down.
Can be independent of the master control unit of gig according to the gig monitor of the embodiment of the invention, the intellectuality of record Hoist Speed curve does not need the user's modification program.
In addition, according to the gig of the embodiment of the invention because with the velocity curve of the actual safe operation standard as protection, therefore, applicability is good, can easily be applied to the pit shaft and the gig of various conditions.
In addition; gig monitor according to the embodiment of the invention not only compares the actual speed of gig with the standard speed that writes down under mode standard; and position and/or the speed that the master control unit of the actual position of gig and/or speed and gig calculates compared, thereby has duplicate protection.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or other aspects of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the structural representation according to the monitor that is used for gig of the embodiment of the invention;
Fig. 2 is in the comparative view of the gig standard speed curve that writes down under the mode standard with the curve of the gig actual speed that calculates under the real-world operation pattern according to the monitor that is used for gig of the embodiment of the invention;
Fig. 3 is the comparative view of the curve of the theoretical gig standard speed curve that calculates and gig actual speed in traditional gig monitor;
Fig. 4 is the key frame according to the telltale of the monitor that is used for gig of the embodiment of the invention.
Fig. 5 is the warning picture of telltale;
Fig. 6 is that the parameter of telltale is set picture;
Fig. 7 is the gig operation picture of telltale;
Fig. 8 is the casualty data picture of telltale;
Fig. 9 is the learning data picture of telltale.
Figure 10 shows the diagram of circuit that standard speed and actual speed is compared according to the monitor of the embodiment of the invention;
Figure 11 shows the diagram of circuit that actual speed that the Hoist Speed that the master control unit of gig calculated according to the monitor of the embodiment of the invention and monitor calculate compares.
The specific embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish label is represented components identical.Be used to explain the present invention below by the embodiment that is described with reference to the drawings, described embodiment is exemplary, and can not be interpreted as limitation of the present invention.
Fig. 1 shows the structural representation according to the monitor of the embodiment of the invention.As shown in Figure 1, the monitor according to the embodiment of the invention comprises rotary encoder 1, control unit 4, mode selection module 3, high speed counting module 2, alarm unit 7 and telltale 8.
High speed counting module 2 is from rotary encoder 1 received pulse signal and calculate the quantity of impulse singla.Control unit 4 utilizes the speed that calculates gig from the quantity of the impulse singla of high speed counting module 2 receptions.Particularly, for example, by input controllers such as diameter with lifting drum 13, for example the pulsimeter of rotary encoder 1 generation is calculated the displacement (position) of gig operation, utilize displacement then and move the used time of described displacement, just can calculate the speed of each position of gig in a stroke.According to the installation site of rotary encoder 1 and the model of gig, for example, the displacement of each pulse representative is in 1 millimeter to 1 centimetre scope.
Mode selection module 3 is switch control unit 4 between mode standard and real-world operation pattern, and wherein under mode standard, control unit 4 is a standard speed with the speed record of the gig that calculates.For example, control unit 4 is switched under the mode standard, allow mine hoist safety move a stroke, be used as the standard speed of mine hoist safety operation under the speed record of control unit 4 with each position of gig in a stroke, the precision height of the standard speed that this calculates than theoretical formula.Certainly, be understandable that gig can move a plurality of strokes, control unit 4 is a standard speed with the speed record in the optimum stroke of gig in a plurality of strokes, thus, also can constantly revise as the standard speed of control benchmark.The further embodiment according to the present invention, control unit 4 is with the standard speed of each position of form record gig in a stroke of standard speed curve, as shown in Figure 2, certainly, also can be with the form record standard speed of learning data, as shown in Figure 9, Fig. 9 only shows a part of learning data.
Under the real-world operation pattern, control unit 4 compares the gig that calculates in the actual speed in desired location and standard speed corresponding to described desired location, when the difference of actual speed and standard speed surpasses first threshold, for example when actual speed was above standard speed 10% or 15%, control unit 4 sent danger signal so that stop gig.In other words, under the real-world operation pattern, gig operation under the study mode standard monitors, thus make mine hoist safety operation in the real-world operation.
Though having described control unit 4 above is standard speed with the speed record of each position of gig in a stroke under mode standard; be understandable that; the present invention can take different recording modes a different position of stroke according to gig; for example; bigger to gig in the speed record data volume of braking section, fully satisfy the requirement of protection precision.In addition, gig can be a standard speed with the speed record that promotes a plurality of pre-positions of loom in a stroke only, for example, the speed that only writes down accelerating sections and braking section is standard speed, thus, when real-world operation, control unit 4 can also provide precision higher standard speed at braking section when total travel provides standard speed.
As shown in Figure 2, control unit 4 will be that the standard speed curve (is the curve of standard speed and cooresponding position at the speed record of each position of a stroke of mine hoist safety operation under the mode standard, also can be called the pace of learning curve) S2, and the velocity curve of the stroke of gig real-world operation that control unit 4 calculates (being the curve of actual speed and cooresponding position) is S1, as seen from Figure 2, S1 can exceed S2 for example 10%.And S1 is in each stage of a stroke, for example on the section of creeping, accelerating sections, the high-speed cruising section, braking section and under in the section of creeping, very good with the matching degree of S2.
Comparatively speaking, as shown in Figure 3, S3 is the standard speed curve of gig in a stroke that is calculated by theoretical calculation formula, and S1 is the actual speed curve of gig in a stroke.As seen from Figure 3, S1 and S3 are relatively poor at the matching degree in each stage of a stroke, and therefore, control unit 4 may send maloperation.For example, when the difference of actual speed and standard speed surpassed threshold value, control unit 4 may not send danger signal, on the contrary, when the difference of actual speed and standard speed does not surpass threshold value, sent to control unit 4 possible errors danger signal.
Monitor according to the embodiment of the invention, not only have as the standard speed of speed in control each stage of gig in a stroke and to calculate by theory, and have and allow gig under mode standard, move a stroke safely earlier, control unit 4 is a standard speed with the speed record of a stroke of mine hoist safety operation, in the real-world operation afterwards, control unit 4 is monitored the speed of gig in each position with this standard speed, when actual speed is above standard the threshold value of speed regulation, control unit 4 just sends danger signal, so that stop the gig operation.Therefore, according to monitor of the present invention, can adapt to different gigs, the mistake monitoring can not appear in different pit shafts and different application scenarios, and precision height.
The further embodiment according to the present invention, monitor also comprises alarm unit 7, when the difference of the actual speed of gig and standard speed during greater than second threshold value, control unit 4 control alarm units 7 give the alarm, wherein second threshold value is less than first threshold, when for example actual speed was above standard speed 5%, alarm unit 7 sent warning.When actual speed further increases and when surpassing first threshold (actual speed be above standard speed 10%), control unit 4 sends danger signal, stops the gig operation.
The further embodiment according to the present invention, monitor also comprises telltale 8, telltale 8 is used for the different work picture of display monitor, and can be used as man machine interface.Shown in Fig. 4-9, show the different work picture of monitor, thereby make monitor operation and the monitoring more directly perceived.For example, as shown in Figure 6, operating personal can be imported by input of the key on the telltale and the relevant various parameters of gig operation, as drum diameter, and stroke height (bottom-to-top-height), the distance in each stage etc.Thus, monitor can easily be applicable to various gigs and application scenario.As shown in Figure 7, can be by the position and the speed of telltale practical work ground monitoring gig.Shown in 8, can work as when having an accident for another example, can monitor the position and the speed that have an accident intuitively.
The further embodiment according to the present invention, control unit 4 is the master control units 9 that danger signal sent to gig, the drive motor 10 that the master control unit 9 of gig stops to drive gig starts the drg 12 of gig simultaneously, thereby stops the operation of gig.
The further embodiment according to the present invention, control unit 4 also receives gig that master control units 9 the calculate speed in the desired location from the master control unit 9 of gig, and then, control unit 4 compares the speed of gig in the desired location that actual speed and the master control unit 9 of its gig that calculates in the desired location calculates, the difference of the speed that calculates when actual speed and master control unit 9 surpasses the 3rd threshold value when (for example actual speed surpasses the speed 10% that master control unit 9 calculates), control unit 4 sends danger signal to master control unit 9, the drive motor 10 that master control unit 9 stops to drive gig starts the drg 12 of gig simultaneously, thereby stops the operation of gig.Control unit 4 for example can link to each other with output module 5 by load module 6 with master control unit 9, and control unit 4 sends signal from master control unit 9 received signals and by output module 5 to master control unit 9 by load module 6.Be independent element though load module 6 and output module 5 has been shown among Fig. 1, be appreciated that output module 5 and load module 6 can be the part of control unit 4.In addition, the part that aforesaid high speed counting module 2 also can control unit 4.
The further embodiment according to the present invention, the difference of the speed that calculates at actual speed and master control unit 9 greater than the 4th threshold value (for example, actual speed surpasses the speed 5% that master control unit 9 calculates) time, control unit 4 control alarm units 7 send warning, and wherein the 4th threshold value is less than the 3rd threshold value.When actual speed further increases and surpass first threshold (speed 10% that actual speed calculates above master control unit 9), control unit 4 sends danger signal to master control unit 9, the drive motor 10 that the master control unit 9 of gig stops to drive gig starts the drg 12 of gig simultaneously, thereby stops the operation of gig.
Below with reference to the operating process of Figure 10 description according to the monitor of the embodiment of the invention.
As shown in figure 10, at first, by mode selection module 3 monitor is placed mode standard, under mode standard, allow stroke of mine hoist safety ground operation, control unit 4 is recorded as the standard speed curve with the velocity curve of a stroke of mine hoist safety operation.
Then, monitor is placed the real-world operation pattern, under the real-world operation pattern, control unit 4 calculates the actual speed of each positions of gig in a stroke, and compares with actual speed with corresponding to the standard speed of this position.When the difference of actual speed and standard speed surpasses second threshold value, for example, the actual speed speed 5% that is above standard, control unit 4 control alarm units 7 give the alarm, simultaneously, if the difference of actual speed and standard speed has surpassed the first threshold greater than second threshold value, the time speed speed 10% that is above standard for example, then control unit 4 is not only controlled alarm unit 7 and is sent warning, also send danger signal simultaneously to the master control unit 9 of gig, master control unit 9 stops to drive the drive motor 10 of gig, for example tripping operation, and start drg 12 braking gigs.
Figure 11 shows the flow process that gig position that control unit 4 calculates the actual position of gig and/or speed and master control unit 9 and/or speed compare, and the flow process shown in this flow process and Figure 10 is carried out simultaneously.
Except the operation shown in Figure 10, gig position and/or speed that control unit 4 also calculates the actual position of gig and/or speed and master control unit 9 compare.When the difference of gig position that actual position and/or speed and master control unit 9 calculate and/or speed surpasses the 4th threshold value, for example, actual position and/or speed surpass gig position and/or speed regulation three threshold values that master control unit 9 calculates, control unit 4 control alarm units 7 give the alarm, simultaneously, if the difference of the comparison of the Hoist Speed that actual speed and master control unit 9 calculate has surpassed the 3rd threshold value greater than the 4th threshold value, then control unit 4 is not only controlled alarm unit 7 and is sent warning, also send danger signal simultaneously to the master control unit 9 of gig, master control unit 9 stops to drive the drive motor 10 of gig, for example tripping operation, and start drg 12 braking gigs.Thereby for gig provides duplicate protection.
Gig monitor according to the embodiment of the invention; not only the velocity curve that theory is calculated is as the safety guard-safeguard standard of gig real-world operation; and the velocity curve that under mode standard gig is normally moved is as protecting standard; therefore monitor of the present invention is also referred to as intelligence learning type monitor; described monitor is simple in structure, and protection precision height does not have misoperation; life-span is long, is not easy to break down.Can be independent of the master control unit of gig according to the gig monitor of the embodiment of the invention, the intellectuality of record Hoist Speed curve does not need the user's modification program.According to the gig of the embodiment of the invention because with the velocity curve of the actual safe operation standard as protection, therefore, applicability is good, can easily be applied to the pit shaft and the gig of various conditions.In addition, the gig monitor according to the embodiment of the invention can provide dual monitoring and protection for gig.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can change that scope of the present invention is limited by claims and equivalent thereof to these embodiment.
Claims (10)
1. a monitor that is used for gig is characterized in that, comprising:
Rotary encoder, this rotary encoder are used to detect displacement and the output and the cooresponding impulse singla of gig displaced phase of gig;
Control unit, the impulse singla that this control unit utilization receives from described rotary encoder calculates the speed of gig; With
Mode selection module, this mode selection module is switch control unit between mode standard and real-world operation pattern, wherein under mode standard, described control unit is a standard speed with the speed record of the gig that calculates, under the real-world operation pattern, described control unit compares the gig that calculates in the actual speed in desired location and standard speed corresponding to described desired location, thus the difference of described actual speed and standard speed during above first threshold described control unit send danger signal so that stop gig.
2. the monitor that is used for gig according to claim 1, it is characterized in that, further comprise high speed counting module, this high speed counting module is used to calculate the quantity of the impulse singla of rotary encoder, and wherein said control unit utilizes the quantity of described impulse singla to calculate the speed of gig.
3. the monitor that is used for gig according to claim 1 is characterized in that, under mode standard, described control unit calculates the standard speed of each position of gig in a stroke.
4. the monitor that is used for gig according to claim 3 is characterized in that,
Described control unit is with the standard speed of each position of form record gig in a stroke of standard speed curve.
5. the monitor that is used for gig according to claim 1 is characterized in that, described rotary encoder is installed on one of the reel of gig, the track adjusting wheel of gig and drive motor of gig.
6. according to each described monitor that is used for gig among the claim 1-5, it is characterized in that, further comprise alarm unit, when the difference of described actual speed and standard speed during greater than second threshold value described control unit control described alarm unit and give the alarm, wherein second threshold value is less than first threshold.
7. the monitor that is used for gig according to claim 6, it is characterized in that, described control unit sends to the master control unit of gig with danger signal, so that the master control unit of gig stops to drive the drg that the drive motor of gig starts gig simultaneously.
8. the monitor that is used for gig according to claim 7 is characterized in that, described control unit receives gig that master control unit the calculates speed in the desired location from the master control unit of gig, and
Described control unit compares the speed of gig in the desired location that actual speed and the master control unit of its gig that calculates in the desired location calculates, thereby described control unit sends danger signal to master control unit when the difference of the speed that calculates at described actual speed and master control unit surpasses the 3rd threshold value.
9. the monitor that is used for gig according to claim 8, it is characterized in that, further comprise alarm unit, the difference of the speed that calculates at described actual speed and master control unit during greater than the 4th threshold value described control unit control alarm unit send warning, wherein the 4th threshold value is less than the 3rd threshold value.
10. according to claim 1 or the 8 described monitors that are used for gig, it is characterized in that, further comprise telltale, be used to show different work pictures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101788394A CN101450762B (en) | 2007-12-06 | 2007-12-06 | Monitoring apparatus for lifting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101788394A CN101450762B (en) | 2007-12-06 | 2007-12-06 | Monitoring apparatus for lifting machine |
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| CN101450762A CN101450762A (en) | 2009-06-10 |
| CN101450762B true CN101450762B (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101788394A Active CN101450762B (en) | 2007-12-06 | 2007-12-06 | Monitoring apparatus for lifting machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103204416B (en) * | 2012-01-12 | 2015-06-24 | 上海三菱电梯有限公司 | Wear detection device for elevator driving rope sheave |
| CN103204417B (en) * | 2012-01-12 | 2015-08-19 | 上海三菱电梯有限公司 | Elevator drive rope sheave wear detector and method of inspection |
| CN102905114B (en) * | 2012-10-16 | 2015-04-01 | 中煤第五建设有限公司第四十九工程处 | Mine hoisting machine room video monitoring device |
| CN103538982B (en) * | 2013-11-01 | 2016-02-24 | 苏州德奥电梯有限公司 | A kind of escalator monitoring device |
| CN103569163A (en) * | 2013-11-12 | 2014-02-12 | 中国神华能源股份有限公司 | Train state monitoring system and train state monitoring method |
| WO2015074958A1 (en) * | 2013-11-21 | 2015-05-28 | Inventio Ag | Method for operating a lift control system |
| CN104803243A (en) * | 2015-04-22 | 2015-07-29 | 中煤电气有限公司 | Controlling system for well building elevator |
| CN104787680A (en) * | 2015-04-29 | 2015-07-22 | 唐山重安环保科技有限公司 | Control device and control method for lifting height of crane |
| JP6398879B2 (en) * | 2015-06-09 | 2018-10-03 | 三菱電機ビルテクノサービス株式会社 | Elevator work status monitoring device and work status monitoring method |
| CN108809195A (en) * | 2018-07-06 | 2018-11-13 | 珠海格力电器股份有限公司 | System and method for testing accuracy of motor feedback signal |
| CN110104531B (en) * | 2019-05-21 | 2021-10-01 | 山东东山新驿煤矿有限公司 | Elevator control protection system and control method based on constant-deceleration hydraulic station |
| CN111003617B (en) * | 2019-12-19 | 2022-03-25 | 临沂矿业集团菏泽煤电有限公司 | Control system of lifter for coal mine and residue detection method |
| CN111302176A (en) * | 2020-03-20 | 2020-06-19 | 山东星斗智能设备有限公司 | Lifting device monitored control system for building |
| CN113415746A (en) * | 2021-06-29 | 2021-09-21 | 攀钢集团西昌钢钒有限公司 | Sliding tank detection method and sliding tank detection system |
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| CN85107528A (en) * | 1984-10-15 | 1986-05-10 | 三菱电机株式会社 | The location monitoring system of elevator |
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Inventor after: Bai Guanghui Inventor after: Ma Wenli Inventor after: Yang Li Inventor before: Bai Guanghui Inventor before: Ma Wenli |
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Free format text: CORRECT: INVENTOR; FROM: BAI GUANGHUI MA WENLI TO: BAI GUANGHUI MA WENLI YANG LI |