CN103640942B - A kind of data correcting method of overload protector for elevators - Google Patents
A kind of data correcting method of overload protector for elevators Download PDFInfo
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- CN103640942B CN103640942B CN201310593473.2A CN201310593473A CN103640942B CN 103640942 B CN103640942 B CN 103640942B CN 201310593473 A CN201310593473 A CN 201310593473A CN 103640942 B CN103640942 B CN 103640942B
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000001012 protector Effects 0.000 title claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 5
- 230000037396 body weight Effects 0.000 claims description 4
- 230000000875 corresponding effect Effects 0.000 description 11
- 230000003292 diminished effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010010219 Compulsions Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
- B66B3/002—Indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/14—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads
- B66B5/145—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads electrical
Landscapes
- Indicating And Signalling Devices For Elevators (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention belongs to technical field of engineering machinery; be specially a kind of overload protector for elevators, comprise sensing bearing pin, filter circuit, A/D convertor circuit, central processing unit, the input of elevator running state, photoelectric coupling circuit, Control output circuit, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit.The present invention also provides the automatic calibrating method of this fender guard, sensing bearing pin method for diagnosing faults, avoid method, gain adjusting method, the barking method of overload protection misoperation in running, with ensure this fender guard normal, safe, precisely run.
Description
Technical field
The invention belongs to technical field of engineering machinery, be specially a kind of data correcting method of overload protector for elevators.
Background technology
State compulsion in 2008 requires that building ground building hoist must be configured with overload protection.Caused by the accident causation system overload operation against rules of current more than 80%, overload protection detects real-time load by sensing bearing pin, when load exceeds specified year 110%, by cutting off the operation of the prevention building hoist of output relay.It is the important leverage of building ground safety in production.
Before existing overload protection device uses at the scene, initial calibration work must be carried out.The object of calibration is the loaded load of the display cage that overload protection device can be prepared, generally calibration operation has following two processes: be first peeling process, when cage is unloaded, press the peeling key on overload protection panel, the acquisition of signal loop of fender guard is just set to AD signal ad0 at zero point the piezoelectric signal that sensor is now sent here, and makes displayed value be zero; Then for gain loads debug process, in the load of cage dress loading more than one ton, by input through keyboard actual load value NO1, the acquisition of signal loop of fender guard just arranges current load AD signal ad1 the piezoelectric signal that sensor is now sent here.Load due to bearing pin is stressed is good linear relation with output piezoelectric signal, by the AD signal ad1 of actual load value NO1 that keyboard inputs and correspondence thereof, zero point AD signal ad0, the corresponding relation of AD signal ad that sensor sends here in real time and displayed value NO can be obtained: loading factor K=NO1/ (ad1-ad0), NO=K* (ad-ad0).Different loaded load can produce corresponding sensing weight AD signal ad; overload protection device is by calculating real-time load displayed value NO to different AD signal; when displayed value NO exceedes 110% of elevator rated load value ED_NO, fender guard makes corresponding action.
In building-site investigation process, client generally reflect overload protection device weigh inaccurate, fault rate is high.Major part weight limitor is in faulty condition, and camp site does not know how to carry out breakdown judge to overload protection device.The output of overload protection device controls contact and is directly shorting out, and cannot open the effect of limit for tonnage protection.Through understanding overload protection device field activity situation in depth, find mainly to deposit problem in the following areas.
(1) bearing pin is after suffering frequent physical shock, and piezoelectric signal has the trend diminished.After the overload protection calibrated uses a period of time, piezoelectric signal has the trend diminished, and load displayed value is significantly less than actual loaded weight, causes weighing inaccurate.In elevator operational process, bearing pin frequently can be subject to physical shock, and due to the material behavior of bearing pin elastic body itself, along with the accumulation of this impact effect, piezoelectric signal has the trend diminished.
(2) sensing bearing pin damages comparatively general.Sensing bearing pin is in installation, use procedure, install due to cruelty and cause that bearing pin elastic body cannot recover, bearing pin cable is easily pounded disconnected by falling object from high altitude, add the reasons such as cable is aging, easily cause bearing pin to export piezoelectric signal to go wrong, signal magnitude arbitrarily fluctuates, and load data display is frequently beated.The supporting sensing bearing pin of current overload protection device, if there is fault, can only be determined, and general on-the-spot electrician has been difficult to by professional by the mode measuring bearing pin piezoelectric signal.
(3) system parameter is disorderly, and overload protection device cannot work.Get muddled owing to calculating the system parameters such as ad0, ad1, NO1, K of the display of real-time load, possible cause is after sensing bearing pin damages, and field staff thinks that overload protection device from new adjustment, and need load the data of meeting typing mistake in debug process.Even if now use sensing bearing pin working properly, also there will be the situation of load display mistake.
(4) overload in elevator operational process easy misoperation.Elevator adopts rack-and-gear mode to drive, and in operational process, the stressed jumping characteristic of bearing pin is larger, easily causes data to beat and causes load to show detection instability, even cause overload protection misoperation.In " misoperation " of elevator run duration overload protection device, the elevator causing common power frequency to drive directly is stopped; Cause the elevator of transducer drive in the unexpected ramp to stop of run duration or warning of breaking down.Therefore the protective effect of overload protection is preferably eliminated after normal startup.In this design, add operation specially determine entrance point, maintain former data in the elevator operation phase constant.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of data correcting method of overload protector for elevators is provided, guarantee that lifting function continues safety, correctly, accurately, stably works.
For realizing above-mentioned technical purpose, scheme provided by the invention is: a kind of overload protector for elevators, comprise sensing bearing pin, filter circuit, A/D convertor circuit, central processing unit, elevator running state inputs, photoelectric coupling circuit, Control output circuit, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit, described sensing bearing pin is arranged between the cage body of elevator and trolley frame, and sensing bearing pin connects the signal receiving end of central processing unit successively by filter circuit and A/D convertor circuit, described photoelectric coupling circuit connects the signal input part of central processing unit, the signal output part of described central processing unit connects Control output circuit respectively, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit.
The present invention also provides a kind of automatic calibrating method of overload protector for elevators, i.e. Zero-tracking, comprises the steps.
Step one, to zero load (i.e. zero point) the preset value ad0 of micro controller system typing safety.
Step 2, opens elevator no-load run, starts sensing bearing pin and gathers elevator real-time running data ad value.
Step 3, zero load (i.e. zero point) the preset value ad0 that the elevator real-time running data ad collected by sensing bearing pin is sent to micro controller system and typing compares, if ad is greater than ad0, does not then process ad0; If ad is less than ad0, and when ad0-ad is greater than the threshold value 50kg of setting, by ad assignment now to ad0, then complete zero load (i.e. zero point) tracing process.
The present invention also provides a kind of sensing bearing pin method for diagnosing faults of overload protector for elevators, comprises the steps.
Step one, to the fully loaded preset value ad of micro controller system typing safety
max.
Step 2, starting up's sensing bearing pin gathers elevator real-time running data ad value.
Step 3, elevator real-time running data ad and the ad that sensing bearing pin collects by micro controller system
maxcompare, if ad is less than or equal to ad
max, then judge that sensing bearing pin is normal, micro controller system is to group of four figures pipe real-time AD value display unit output signal, and group of four figures pipe real-time AD value display unit shows elevator real-time running data ad; If ad is greater than ad
max, then judge sensing bearing pin fault, micro controller system is to group of four figures pipe real-time AD value display unit output signal, and group of four figures pipe real-time AD value display unit shows failure code " EE1 ".
The present invention also provides a kind of method avoiding overload protection misoperation in operation of overload protector for elevators, comprises the steps.
Step one, to the preset value ad0 at zero point of micro controller system typing safety.
Step 2, starting up's sensing bearing pin gathers elevator real-time running data ad value.
Step 3, if elevator is in running state, does not then carry out real-time load value calculating, continues display elevator real-time running data ad; If elevator is in halted state, then calculate real-time load value NO by formula NO=K* (ad-ad0), wherein K is loading factor.
The present invention also provides a kind of data correcting method of overload protector for elevators, comprises gain adjusting method and barking method.
Gain adjusting method, comprises the steps.
Step one, loads more than 1 ton load, and micro controller system reads the AD value ad1 that weighs that sensing bearing pin collects.
Step 2, in conjunction with the gain load value NO1 now inputted, micro controller system calculates loading factor K by formula K=NO1/ (ad1-ad0).
Step 3, by the K value corresponding to K value and 1mv/v precision bearing pin, namely 200, compare, if K value is in ± 5% scope, then assignment is carried out to loading factor K and store; Otherwise abandon this data, and show failure code " EE2 " by three Digital sum pipe load display units.
Barking method, comprises the steps.
Step one, to the sampled data ad0 that the empty cage weight of micro controller system typing and elevator is corresponding.
Step 2, under elevator light condition, starting up's sensing bearing pin gathers elevator real-time weighing data ad value.
Step 3, micro controller system reads the unloaded corresponding value ad that weighs, and ad and sampled data ad0 value is compared, if ad value corresponding cage body weight ± 5% scope in, then allow this to operate and ad assignment stored to ad0, complete peeling process; Otherwise abandon this data, and show failure code " EE0 " by three Digital sum pipe load display units.
Beneficial effect of the present invention is: monitor in real time elevator, continue safety to make lifting function, correctly, accurately, stably work, and possess trouble diagnosing, self-correction, avoid the functions such as maloperation, and fault test is simple, professional need not be relied on to operate, and general on-the-spot electrician can be competent at the operation of fault test.
Accompanying drawing explanation
Fig. 1 is overload protector for elevators scheme of installation of the present invention.
Fig. 2 is overload protector for elevators structural representation of the present invention.
Fig. 3 is automatic tracing process flow diagram flow chart at zero point of the present invention.
Fig. 4 is that the real-time AD value of the present invention judges and flow for displaying figure.
Fig. 5 is Gain tuning process flow diagram flow chart of the present invention.
Fig. 6 is that the present invention removes the peel process flow diagram flow chart.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
The present embodiment provides a kind of overload protector for elevators, as depicted in figs. 1 and 2, comprise sensing bearing pin, filter circuit, A/D convertor circuit, central processing unit, elevator running state inputs, photoelectric coupling circuit, Control output circuit, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit, described sensing bearing pin is arranged between the cage body of elevator and trolley frame, and sensing bearing pin connects the signal receiving end of central processing unit successively by filter circuit and A/D convertor circuit, described photoelectric coupling circuit connects the signal input part of central processing unit, the signal output part of described central processing unit connects Control output circuit respectively, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit.
During above-mentioned overload protector for elevators work, sensing bearing pin exports piezoelectric signal, carries out A/D after filtering and be converted to digital signal after circuit.Central processing unit judges this AD signal, namely exports failure code as gone beyond the scope.As rationally entered next step real-time LOAD FOR link, before beginning LOAD FOR, central processing unit reads elevator operating state signal.As elevator be in standby in, namely carry out real-time LOAD FOR.As being in operation, current load is not calculated.Compare with rated load after obtaining real-time load, export sound and light alarm signal as real-time load exceeds rated load 80%; Elevator is stoped to enter running state as real-time payload overload rated load 110% exports control by relay.
The present embodiment also provides a kind of automatic calibrating method of overload protector for elevators, i.e. Zero-tracking, as shown in Figure 3, comprises the steps.
Step one, to zero load (i.e. zero point) the preset value ad0 of micro controller system typing safety.
Step 2, opens elevator no-load run, starts sensing bearing pin and gathers elevator real-time running data ad value.
Step 3, zero load (i.e. zero point) the preset value ad0 that the elevator real-time running data ad collected by sensing bearing pin is sent to micro controller system and typing compares, if ad is greater than ad0, does not then process ad0; If ad is less than ad0, and when ad0-ad is greater than the threshold value 50kg of setting, by ad assignment now to ad0, then complete zero load (i.e. zero point) tracing process.
Overcome sensing bearing pin after suffering frequent physical shock, piezoelectric signal has the trend diminished, and load displayed value is significantly less than actual loaded weight, causes inaccurate problem of weighing.After ensureing that the overload protection calibrated uses a period of time, even if piezoelectric signal has the trend diminished, still can weigh accurately.
The present embodiment also provides a kind of sensing bearing pin method for diagnosing faults of overload protector for elevators, as shown in Figure 4, comprises the steps.
Step one, to the fully loaded preset value ad of micro controller system typing safety
max.
Step 2, starting up's sensing bearing pin gathers elevator real-time running data ad value.
Step 3, elevator real-time running data ad and the ad that sensing bearing pin collects by micro controller system
maxcompare, if ad is less than or equal to ad
max, then judge that sensing bearing pin is normal, micro controller system is to group of four figures pipe real-time AD value display unit output signal, and group of four figures pipe real-time AD value display unit shows elevator real-time running data ad; If ad is greater than ad
max, then judge sensing bearing pin fault, micro controller system is to group of four figures pipe real-time AD value display unit output signal, and group of four figures pipe real-time AD value display unit shows failure code " EE1 ".
Ad now
maxcan be set as 3000, because cage body weight adds maximum load weight, 2.2 tons of sums are 4 tons, load the ad that 4 tons of load obtains
maxgenerally can not more than 3000.
Sensing bearing pin is in installation, use procedure, install due to cruelty and cause that sensing bearing pin elastic body cannot recover, sensing bearing pin cable is easily pounded disconnected by falling object from high altitude, add the reasons such as cable is aging, sensing bearing pin exports piezoelectric signal open circuit or instability, signal magnitude arbitrarily fluctuates, and load data display is frequently beated.The supporting sensing bearing pin of current overload protection device, if there is fault, generally can only rely on professional to be determined by the mode measuring sensing bearing pin piezoelectric signal, and this method achieves generic field electrician and also can detect simply, easily.
The present embodiment also provides a kind of method avoiding overload protection misoperation in operation of overload protector for elevators, comprises the steps.
Step one, to the preset value ad0 at zero point of micro controller system typing safety.
Step 2, starting up's sensing bearing pin gathers elevator real-time running data ad value.
Step 3, if elevator is in running state, does not then carry out real-time load value calculating, continues display elevator real-time running data ad; If elevator is in halted state, then calculate real-time load value NO by formula NO=K* (ad-ad0), wherein K is loading factor.
Elevator adopts rack-and-gear mode to drive, and in operational process, the stressed jumping characteristic of sensing bearing pin is larger, easily causes data to beat and causes load to show detection instability, even cause overload protection misoperation.In " misoperation " of elevator run duration overload protection device, the elevator causing common power frequency to drive directly is stopped, or cause the elevator of transducer drive in the unexpected ramp to stop of run duration or warning of breaking down.And this method well avoids " misoperation " of overload protection device, ensure the normal operation of elevator.
The present embodiment also provides a kind of data correcting method of overload protector for elevators, comprises gain adjusting method and barking method.
Gain adjusting method, as shown in Figure 5, comprises the steps.
Step one, loads more than 1 ton load, and micro controller system reads the AD value ad1 that weighs that sensing bearing pin collects.
Step 2, in conjunction with the gain load value NO1 now inputted, micro controller system calculates loading factor K by formula K=NO1/ (ad1-ad0).
Step 3, by the K value corresponding to K value and 1mv/v precision bearing pin, namely 200, compare, if K value is in ± 5% scope, then assignment is carried out to loading factor K and store; Otherwise abandon this data, and show failure code " EE2 " by three Digital sum pipe load display units.
Barking method, as shown in Figure 6, comprises the steps.
Step one, to the sampled data ad0 that the empty cage weight of micro controller system typing and elevator is corresponding.
Step 2, under elevator light condition, starting up's sensing bearing pin gathers elevator real-time weighing data ad value.
Step 3, micro controller system reads the unloaded corresponding value ad that weighs, and ad and sampled data ad0 value is compared, if ad value corresponding cage body weight ± 5% scope in, then allow this to operate and ad assignment stored to ad0, complete peeling process; Otherwise abandon this data, and show failure code " EE0 " by three Digital sum pipe load display units.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvement or distortion, these improve or distortion also should be considered as protection scope of the present invention.
Claims (1)
1. the data correcting method of an overload protector for elevators, its overload protector for elevators comprises sensing bearing pin, filter circuit, A/D convertor circuit, central processing unit, elevator running state inputs, photoelectric coupling circuit, Control output circuit, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit, described sensing bearing pin is arranged between the cage body of elevator and trolley frame, and sensing bearing pin connects the signal receiving end of central processing unit successively by filter circuit and A/D convertor circuit, described photoelectric coupling circuit connects the signal input part of central processing unit, the signal output part of described central processing unit connects Control output circuit respectively, acousto-optic warning unit, three Digital sum pipe load display units and group of four figures pipe real-time AD value display unit, comprise gain adjusting method and barking method,
1) gain adjusting method, comprises the steps:
Step one, loads more than 1 ton load, and micro controller system reads the AD value ad1 that weighs that sensing bearing pin collects;
Step 2, in conjunction with the gain load value NO1 now inputted, micro controller system calculates loading factor K by formula K=NO1/ (ad1-ad0);
Step 3, by the K value corresponding to K value and 1mv/v precision bearing pin, namely 200, compare, if K value is in ± 5% scope, then assignment is carried out to loading factor K and store; Otherwise abandon this data, and show failure code " EE2 " by three Digital sum pipe load display units;
2) barking method, comprises the steps:
Step one, to the sampled data ad0 that the empty cage weight of micro controller system typing and elevator is corresponding;
Step 2, under elevator light condition, starting up's sensing bearing pin gathers elevator real-time weighing data ad value;
Step 3, micro controller system reads the unloaded corresponding value ad that weighs, and ad and sampled data ad0 value is compared, if ad value corresponding cage body weight ± 5% scope in, then allow this to operate and ad assignment stored to ad0, complete peeling process; Otherwise abandon this data, and show failure code " EE0 " by three Digital sum pipe load display units.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593473.2A CN103640942B (en) | 2013-11-23 | 2013-11-23 | A kind of data correcting method of overload protector for elevators |
| CN201510775888.0A CN105329734A (en) | 2013-11-23 | 2013-11-23 | Sensing pin roll fault diagnosis method for lifter overload protective device |
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| CN201310593473.2A CN103640942B (en) | 2013-11-23 | 2013-11-23 | A kind of data correcting method of overload protector for elevators |
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| CN201510775888.0A Division CN105329734A (en) | 2013-11-23 | 2013-11-23 | Sensing pin roll fault diagnosis method for lifter overload protective device |
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| CN103640942A CN103640942A (en) | 2014-03-19 |
| CN103640942B true CN103640942B (en) | 2016-04-13 |
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| CN201510775888.0A Pending CN105329734A (en) | 2013-11-23 | 2013-11-23 | Sensing pin roll fault diagnosis method for lifter overload protective device |
| CN201310593473.2A Active CN103640942B (en) | 2013-11-23 | 2013-11-23 | A kind of data correcting method of overload protector for elevators |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6499092B2 (en) * | 2016-01-12 | 2019-04-10 | 株式会社日立ビルシステム | Elevator load detection adjustment device and elevator |
| JP6472393B2 (en) * | 2016-01-12 | 2019-02-20 | 株式会社日立ビルシステム | Elevator load detection adjustment device and elevator |
| CN110799447B (en) * | 2017-01-25 | 2021-03-16 | Jlg工业公司 | Pressure-based load sensing system |
| CN108534998B (en) * | 2017-03-03 | 2021-04-30 | 古德里奇公司 | Automatic testing of overload protection devices in rescue winches |
| JP6738304B2 (en) * | 2017-06-26 | 2020-08-12 | 株式会社日立ビルシステム | Elevator maintenance system and elevator maintenance method |
| CN112499416B (en) * | 2019-09-16 | 2023-03-21 | 湖南中联重科建筑起重机械有限责任公司 | Elevator control system, equipment and storage medium based on information feedback |
| CN113495519A (en) * | 2021-07-06 | 2021-10-12 | 长江三峡通航管理局 | Device, system and method for detecting thrust of mechanical hoist |
| CN114706289A (en) * | 2022-04-02 | 2022-07-05 | 三一重机有限公司 | Method, device, equipment, medium and work machine for controlling work machine |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103640942A (en) | 2014-03-19 |
| CN105329734A (en) | 2016-02-17 |
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Denomination of invention: A Data Correction Method for Overload Protection Device of Elevators Effective date of registration: 20230714 Granted publication date: 20160413 Pledgee: China Construction Bank Corporation Jingzhou Longshan Temple Sub-branch Pledgor: JOINHAND CONSTRUCTION MACHINERY Co.,Ltd. Registration number: Y2023980048462 |
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Granted publication date: 20160413 Pledgee: China Construction Bank Corporation Jingzhou Longshan Temple Sub-branch Pledgor: JOINHAND CONSTRUCTION MACHINERY Co.,Ltd. Registration number: Y2023980048462 |
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Denomination of invention: A data correction method for overload protection device of elevator Granted publication date: 20160413 Pledgee: China Construction Bank Corporation Jingzhou Longshan Temple Sub-branch Pledgor: JOINHAND CONSTRUCTION MACHINERY Co.,Ltd. Registration number: Y2024980030414 |