CN103303834B - System and method for protecting rotating shaft of crane driving mechanism - Google Patents
System and method for protecting rotating shaft of crane driving mechanism Download PDFInfo
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- CN103303834B CN103303834B CN201210057974.4A CN201210057974A CN103303834B CN 103303834 B CN103303834 B CN 103303834B CN 201210057974 A CN201210057974 A CN 201210057974A CN 103303834 B CN103303834 B CN 103303834B
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Abstract
The invention relates to the field of hoisting machinery, and discloses a system and a method for protecting a rotating shaft of a crane driving mechanism. The system and the method for protecting the rotating shaft are different from a detection technology in the prior art that a motor and a winding drum need to be respectively provided with a position encoder, only a displacement measuring device needs to be installed on the winding drum, the rotation speed information of the motor is acquired from a servo drive of a servo motor, the rotation speed information of the motor is converted to the rotation speed of the rotating shaft of the winding drum, a theoretical traveling distance of the rotating shaft of the winding drum is obtained by integrating the rotation speed of the rotating shaft of the winding drum within a fixed period of time, the theoretical traveling distance is compared with the real traveling distance recorded by the displacement measuring device, when the difference between the theoretical traveling distance and the real traveling distance exceeds a preset warning value, a shaft broken accident can be determined, and a brake device is controlled to brake. The system and the method for protecting the rotating shaft of the crane driving mechanism have the advantages of low cost, high reliability and high detection accuracy and are applicable to a nuclear-grade device associated to the nuclear security.
Description
Technical field
The present invention relates to elevator machinery field, particularly relate to a kind of rotating shaft protection system and method for hoist drive mechanism.
Background technology
Atomic fuel handling storage system is responsible for the lifting of nuclear fuel assembly between nuclear station overhaul time, transhipment, wherein hoisting crane is its requisite implement, the breaking axis protection of driver train is needed in case there is breaking axis in the safety precaution of hoisting crane, breaking axis mainly refers to the rotor of high-speed cruising, axle weak link because of Crack Extension or overload plastic instability, axle is snapped or rotor fly escape major accident, once there is breaking axis directly will affect nuclear safety, therefore off-axis detection technique is in prevention atomic fuel accident, ensure that nuclear safety aspect plays a very important role.
As shown in Figure 1, the rotating shaft protection system that in prior art, hoist drive mechanism adopts is generally all installed a coder in the speed end (motor) of driver train and low speed end (reel), in driver train working process, speed end coder detects and obtains motor speed, low speed end coder detects and obtains drum speed, drum speed is compared divided by the ratio of motor speed and the fixed drive ratio of gear case, if this ratio and transmitting ratio gap exceed certain limit, namely be judged as having occurred breaking axis, control brake gear immediately to brake, to avoid occurring more serious accident.In prior art in actual application, there is following shortcomings:
1, cost is high, needs two cover coders to be arranged on driver train speed end and low speed end respectively in prior art;
2, poor reliability, because motor speed is very high, the probability that speed end coder damages is higher;
3, accuracy is lower, owing to being comparison rotating speed, affecting comparatively large, occur erroneous judgement sometimes by momentary status.
Broken shaft protection system of the prior art, owing to there is shortcomings, particularly can not be applicable to directly related with nuclear safety and have in the nuclear-related equipment of strict demand to level of security, therefore needs to develop a kind of more advanced off-axis detection technique.
Summary of the invention
The technical problem to be solved in the present invention is the reliability and the accuracy that improve breaking axis detection and protection, provides a kind of rotating shaft protection system and method for hoist drive mechanism.
The technical solution adopted for the present invention to solve the technical problems is:
The invention provides a kind of rotating shaft protection system of hoist drive mechanism, described hoist drive mechanism comprises servo-driver, by the servomotor that described servo-driver controls, by gear case and the reel of described driven by servomotor, the transmission of power that described servomotor provides by described gear case to described reel drives described spool turns, it is characterized in that, described rotating shaft protection system comprises and to be connected with described servo-driver communication and to be set with the controller of warning value C, the displacement measuring device be connected with described controller communication, and to be connected with described controller and to be controlled brake gear that described reel is braked by described controller, wherein,
Described controller obtains the velocity of rotation information of servomotor from described servo-driver, obtain the velocity of rotation of the rotating shaft of described reel according to the gear ratio calculation of this velocity of rotation information and described gear case, the theory of rotating shaft in a time gap t1 calculating described reel according to the velocity of rotation of the rotating shaft of described reel runs stroke A;
Institute's displacement measurement is for recording the stroke of the rotating shaft of described reel, and described controller gathers institute's displacement measurement device and exports the real-world operation stroke B of difference as the rotating shaft of described reel at the stroke of described time gap t1 start time and finish time;
Described controller more theoretical operation stroke A and real-world operation stroke B, when the absolute value delta of its difference departs from presetting described warning value C, there is accident in described controller judgment device, and control brake gear braking.
Particularly, described brake gear is arranged on described reel.
Particularly, institute's displacement measurement device is coder.
Particularly, described controller is Programmable Logic Controller.
Further, also comprise the indicator lamp that at least one controls by described controller, when there is breaking axis, this indicator lamp lighted by described controller.
Further, also comprise the siren horn controlled by described controller, when there is breaking axis, described controller controls this siren horn and to give the alarm sound.
The present invention also provides a kind of rotating shaft guard method of hoist drive mechanism; described hoist drive mechanism comprises servo-driver, by the servomotor of servo-driver control, the gear case of driven by servomotor and reel; the transmission of power that motor provides by gear case rotates to roll of tape movable reel; it is characterized in that, described method comprises the following steps:
S1: according to the velocity information of described servomotor and the transmitting ratio of described gear case, the theory that process obtains the rotating shaft of described reel in a time gap t1 runs stroke A;
S2: acquisition process is in start time of time gap t1 and finish time, and the difference of the rotating shaft run-length data of described reel, obtains the real-world operation stroke B of the rotating shaft of described time gap t1 inner drum;
S3: judge whether the theoretical absolute value running stroke A and real-world operation stroke B difference departs from presetting warning value C, if departed from, sends brake instruction, otherwise returns step S1.
Particularly, in described step S1, from described servo-driver, obtain the rotary speed information of described servomotor; And described rotary speed information is multiplied by the rotating shaft rotating speed that transmitting ratio obtains described reel, and in described time gap t1, integration is carried out to this rotating shaft rotating speed, the described theory obtaining the rotating shaft of described reel in time gap t1 runs stroke A.
Particularly, in described step S2, by the stroke of the rotating shaft of reel described in displacement measuring device record, calculate the difference of the rotating shaft run-length data of reel described in described time gap t1 start time and finish time, obtain in described time gap t1, the real-world operation stroke B of the rotating shaft of described reel.
Particularly, in described step S3, when the absolute value judging that described theory runs stroke A and real-world operation stroke B difference is greater than described warning value C, is judged as off-axis, sends brake instruction;
Further, also comprised before step S1: S0, presetting described time gap t1, described transmitting ratio and described warning value C.
Implement beneficial effect of the present invention: the rotating shaft protection system of hoist drive mechanism provided by the invention and method; only need at driver train low speed end installation position measuring system; eliminate the measurement mechanism that speed end is installed compared to existing technology; provide cost savings; improve equipment dependability; and owing to being the shift value in comparison a period of time interval; little by equipment transient effect; improve the accuracy rate that breaking axis detects; timely and accurately for weight-lifting equipment provides off-axis to protect, especially can be applicable in the core level equipment directly related with nuclear safety.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural schematic block diagram of prior art shaft protection system;
Fig. 2 is that embodiment of the present invention shaft protection system connects schematic block diagram;
Fig. 3 is square-wave waveform figure in PLC programmed method in the embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the rotating shaft guard method of hoist drive mechanism of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 2, the invention provides a kind of rotating shaft protection system of hoist drive mechanism, for providing detection and the protection of breaking axis for hoist drive mechanism, servomotor 2, the gear case 3 driven by servomotor 2 and reel 4 that described hoist drive mechanism comprises servo-driver 1, controls by servo-driver 1, the transmission of power that servomotor 2 provides by gear case 3 to reel 4 is with movable reel 4 to rotate; This rotating shaft protection system comprises the controller 5 and displacement measuring device 6 that are set with warning value C, controller is connected with displacement measuring device 6 and servo-driver 1 communication, and this rotating shaft protection system also comprises and to be connected with controller 5 and to be controlled the brake gear (not shown) of braking reel by controller 5;
Displacement measuring device 6 is for the run-length data (rotation displacement) of the rotating shaft of recording reel 4, and in the present embodiment, displacement measuring device 6 is arranged on the axle head of reel 4;
Controller 5 obtains the velocity of rotation information of servomotor 2 from servo-driver 1, to calculate according to this velocity of rotation information and the gear ratio calculation of gear case 3 obtains the velocity of rotation of the rotating shaft of reel 4, calculate the theory operation stroke A of rotating shaft in a time gap t1 of reel 4 according to the velocity of rotation of the rotating shaft of reel 4; Gather the output difference of displacement measuring device 6 in time gap t1 start time and finish time as the real-world operation stroke B of the rotating shaft of reel 4 simultaneously; The theory of the rotating shaft of reel 4 is run stroke A and real-world operation stroke B compare; when the absolute value delta that theory runs the difference of stroke A and real-world operation stroke B is greater than presetting warning value C; judge to think generation breaking axis; controller 5 controls brake gear braking, with proterctive equipment safety.
It should be noted that, aforesaid theory runs the calculating of stroke A and real-world operation stroke B and judgment mode has two kinds, those of ordinary skill in the art can select wherein any one:
Mode one, controller 5 obtain the rotational angular velocity ω of servomotor from servo-driver, the transmitting ratio n1 this angular velocity omega being multiplied by gear case 3 calculates the rotational angular velocity n1 ω of the rotating shaft of reel 4, carries out to the rotational angular velocity n1 ω of the rotating shaft of reel 4 the theory operation stroke A of rotating shaft in time gap t1 that integration obtains reel 4 in time gap t1; Measure the angle turned over of the rotating shaft of reel 4 from displacement measuring device 6, computing time interval t1 start time and finish time reel 4 the difference of angle that turns over of rotating shaft, using the real-world operation stroke B of this difference as reel rotating shaft; Relatively the theory of the rotating shaft of reel 4 runs stroke A and real-world operation stroke B, judge whether the theoretical absolute value running the difference of stroke A and real-world operation stroke B is greater than presetting warning value C, if be namely judged as occurring breaking axis, controller 5 controls brake gear braking.In this account form, transmitting ratio n1 refers to the ratio of the rotational angular velocity of the rotating shaft of reel 4 and the rotational angular velocity of servomotor, and theoretical operation stroke A and real-world operation stroke B refers to the angle turned in theory and in fact respectively of the rotating shaft at time gap t1 inner drum, corresponding warning value C is also an angle value.
Mode two, controller 5 obtain the rotational line speed v of servomotor from servo-driver, the transmitting ratio n2 this linear velocity v being multiplied by gear case 3 calculates the rotational line speed n2v of the rotating shaft of reel 4, carries out to the rotational line speed n2v of the rotating shaft of reel 4 the theory operation stroke A of rotating shaft in time gap t1 that integration obtains reel 4 in time gap t1; Measure the run-length data of the rotating shaft of reel 4 from displacement measuring device 6, computing time interval t1 start time and finish time reel 4 the difference of run-length data of rotating shaft, using the real-world operation stroke B of this difference as reel rotating shaft; Relatively the theory of the rotating shaft of reel 4 runs stroke A and real-world operation stroke B, judge whether the theoretical absolute value running the difference of stroke A and real-world operation stroke B is greater than presetting warning value C, if be namely judged as occurring breaking axis, controller 5 controls brake gear braking.In this account form, transmitting ratio n2 refers to the ratio of the rotational line speed of the rotating shaft of reel 4 and the rotational line speed of servomotor, the theoretical stroke A and real-world operation stroke B that runs refers in the theory of the rotating shaft of time gap t1 inner drum and the distance that turns in fact respectively, accordingly, warning value C is a distance value.
Preferably, in the present embodiment, controller 5 is connected with from displacement measuring device 6 and servo-driver 1 Information Monitoring with displacement measuring device 6 and servo-driver 1 communication by fieldbus, can certainly adopt other connection mode.
Preferably, in the present embodiment, brake gear is arranged on reel 4, and to brake in time in generation breaking axis, certain brake gear also can be arranged on other suitable position of hoist drive mechanism.
Preferably, also comprise at least one indicator lamp (not shown) in this rotating shaft protection system, the controlled device 5 of this indicator lamp controls, and for when there is breaking axis, this indicator lamp is lit or flashes to remind the operating personal of relevant device.
Preferably, also comprise siren horn (not shown) in this rotating shaft protection system, the control of the controlled device 5 of this siren horn, for when there is breaking axis, this siren horn gives the alarm sound to remind the operating personal of relevant device.
Preferably, use the coder can measuring displacement data as displacement measuring device 6 in this enforcement, the devices such as such as acceleration pick-up can certainly be used as displacement measuring device 6.
It should be noted that, coder comprises polytype and purposes, wherein some type can gather and export rotation displacement data, some type can gather and output speed data, in the present embodiment, the rotation displacement data (angle turned over or the distance turned over) of the rotating shaft of reel 4 that what coder that the rotating shaft of reel is installed exported is, and at contrast Fig. 1 in explanation of the prior art, what two coder exported is all rotary speed datas.
Preferably, Programmable Logic Controller selected by controller 5, the device of such as microprocessor and so on can certainly be selected as controller 5, in the present embodiment, the algorithm theory of computation below plogrammable-controller applications runs stroke A and real-world operation stroke B, and carry out judgement and the process of breaking axis, other suitable algorithm can certainly be applied and realize:
Adopt PLC programmed method to obtain one group of continuous print with 100ms(t1), 10ms is the square wave at interval, is namely that Fixed Time Interval t1 is set to 100ms, as shown in Figure 3;
Convert according to the rotational line speed v of servomotor 2 and the transmitting ratio n of gear case 3 and obtain the rotating shaft rotating speed nv of reel 4, in each 100ms interval (high level), perform the integration being function with the rotating shaft rotating speed nv of reel, the theory of rotating shaft in Fixed Time Interval (100ms) obtaining reel 4 runs stroke A; At positive rise, the falling edge of same 100ms square wave, the output valve of record coding device, both differences are the real-world operation stroke B of rotating shaft in Fixed Time Interval (100ms) of reel 4;
Between ensuing 10ms low period, stop computing, difference A being deducted B takes absolute value and obtains Δ, next judges whether to occur breaking axis according to Δ, and following two kinds of methods can be used to judge:
1, judge whether Δ is greater than presetting warning value C, if Δ is greater than C, then thinks and occurred breaking axis, Programmable Logic Controller controls brake gear immediately and brakes, proterctive equipment safety;
2, a warning ratio r can certainly be set, when Δ/A or Δ/B is greater than warning ratio r(as 1%) time, think and occurred breaking axis, Programmable Logic Controller controls brake gear immediately and brakes, proterctive equipment safety.
In above-mentioned algorithm, Fixed Time Interval t1 is set as 100ms; but it should be noted that; Fixed Time Interval t1 also can be set to other numerical value according to actual conditions; the length of certain t1 can not be long; long, the effect carrying out breaking axis judgement and protection in time can not be played; but the length of t1 can not be too short, if the counting accuracy that too short theory runs stroke A and real-world operation stroke B all can reduce, cause judging that breaking axis accuracy reduces.
For aforesaid the second account form in above-mentioned algorithm, can certainly adopt the first account form, in view of two kinds of account forms are substantially identical in step, it will not go into details.
The present invention also provides a kind of rotating shaft guard method of hoist drive mechanism; for providing detection and the protection of breaking axis for the driver train of hoisting crane; described driver train comprises servo-driver, by the servomotor of servo-driver control, the gear case of driven by servomotor and reel; the transmission of power that motor provides by gear case rotates to roll of tape movable reel; with reference to figure 4, described rotating shaft guard method comprises the steps:
Step S0, the parameter that the method needs to use is set, comprises the transmitting ratio n of setting-up time interval t1, driver train speed end and low speed end, warning value C;
Step S1, controller obtain the rotary speed information of servomotor from servo-driver, rotary speed information is multiplied by the rotating speed that transmitting ratio obtains the rotating shaft of reel, in Fixed Time Interval t1, carry out integration to the rotating speed of this rotating shaft, the theory obtaining the rotating shaft of time gap t1 inner drum runs stroke A;
Step S2, stroke (i.e. rotation displacement data) by the rotating shaft of displacement measuring device recording reel, calculate the difference of the stroke in time gap t1 start time and finish time reel rotating shaft, obtain in time gap t1, the real-world operation stroke B of reel rotating shaft;
Step S3, judge whether the theoretical absolute value running stroke A and real-world operation stroke B difference is greater than warning value C, if be greater than, be judged as occurring breaking axis, controller sends brake instruction to brake gear, control brake gear is braked, otherwise return step S1, with detecting whether there is breaking axis of continuing.
It should be noted that, above-mentioned theory runs the calculating of stroke A and real-world operation stroke B and judgment mode has two kinds, those of ordinary skill in the art can select wherein any one, be described below respectively:
Mode one, controller 5 obtain the rotational angular velocity ω of servomotor from servo-driver, the transmitting ratio n1 this angular velocity omega being multiplied by gear case 3 calculates the rotational angular velocity n1 ω of the rotating shaft of reel 4, carries out to the rotational angular velocity n1 ω of the rotating shaft of reel 4 the theory operation stroke A of rotating shaft in time gap t1 that integration obtains reel 4 in time gap t1; Measure the angle turned over of the rotating shaft of reel 4 from displacement measuring device 6, computing time interval t1 start time and finish time reel 4 the difference of angle that turns over of rotating shaft, using the real-world operation stroke B of this difference as reel rotating shaft; Relatively the theory of the rotating shaft of reel 4 runs stroke A and real-world operation stroke B, judge whether the theoretical absolute value running the difference of stroke A and real-world operation stroke B is greater than presetting warning value C, if be namely judged as occurring breaking axis, controller 5 controls brake gear braking.In this account form, transmitting ratio n1 refers to the ratio of the rotational angular velocity of the rotating shaft of reel 4 and the rotational angular velocity of servomotor, and theoretical operation stroke A and real-world operation stroke B refers to the angle turned in theory and in fact respectively of the rotating shaft at time gap t1 inner drum, corresponding warning value C is also an angle value.
Mode two, controller 5 obtain the rotational line speed v of servomotor from servo-driver, the transmitting ratio n2 this linear velocity v being multiplied by gear case 3 calculates the rotational line speed n2v of the rotating shaft of reel 4, carries out to the rotational line speed n2v of the rotating shaft of reel 4 the theory operation stroke A of rotating shaft in time gap t1 that integration obtains reel 4 in time gap t1; Measure the run-length data of the rotating shaft of reel 4 from displacement measuring device 6, computing time interval t1 start time and finish time reel 4 the difference of run-length data of rotating shaft, using the real-world operation stroke B of this difference as reel rotating shaft; Relatively the theory of the rotating shaft of reel 4 runs stroke A and real-world operation stroke B, judge whether the theoretical absolute value running the difference of stroke A and real-world operation stroke B is greater than presetting warning value C, if be namely judged as occurring breaking axis, controller 5 controls brake gear braking.In this account form, transmitting ratio n2 refers to the ratio of the rotational line speed of the rotating shaft of reel 4 and the rotational line speed of servomotor, the theoretical stroke A and real-world operation stroke B that runs refers to distance that is theoretical in the rotating shaft of time gap t1 inner drum and that turn in fact respectively, accordingly, warning value C is a distance value.
Hoist drive mechanism rotating shaft protection system provided by the invention and method; be applicable to as the driver train of various hoisting crane provides detection and the protection of breaking axis; and there is the advantage that cost is low, reliability is high, accuracy in detection is high; especially when being applied to the hoisting crane used in atomic fuel handling storage system; atomic fuel accident can be prevented further, improve nuclear safety.
The above embodiment only have expressed better embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the rotating shaft protection system of a hoist drive mechanism, described hoist drive mechanism comprises servo-driver (1), by the servomotor (2) that described servo-driver (1) controls, the gear case (3) driven by described servomotor (2) and reel (4), the transmission of power that described servomotor (2) provides by described gear case (3) to described reel (4) drives described reel (4) to rotate, it is characterized in that, described rotating shaft protection system comprises and to be connected with described servo-driver (1) communication and to be set with the controller (5) of warning value C, the displacement measuring device (6) be connected with described controller (5) communication, and to be connected with described controller (5) and to be controlled brake gear that described reel (4) is braked by described controller (5), wherein,
Described controller (5) obtains the velocity of rotation information of described servomotor (2) from described servo-driver (1), obtain the velocity of rotation of the rotating shaft of described reel (4) according to the gear ratio calculation of this velocity of rotation information and described gear case (3), the theory of rotating shaft in a time gap t1 calculating described reel (4) according to the velocity of rotation of the rotating shaft of described reel (4) runs stroke A;
Institute's displacement measurement device (6) is for recording the stroke of the rotating shaft of described reel (4), and described controller (5) gathers institute's displacement measurement device (6) and exports the real-world operation stroke B of difference as the rotating shaft of described reel (4) at the stroke of described time gap t1 start time and finish time;
The more described theory of described controller (5) runs stroke A and real-world operation stroke B, when the absolute value delta of its difference departs from presetting described warning value C, there is accident in described controller (5) judgment device, and controls brake gear braking.
2. the rotating shaft protection system of hoist drive mechanism according to claim 1, is characterized in that, described brake gear is arranged on described reel (4).
3. the rotating shaft protection system of hoist drive mechanism according to claim 1, is characterized in that, institute's displacement measurement device (6) is coder.
4. the rotating shaft protection system of hoist drive mechanism according to claim 1, is characterized in that, described controller (5) is Programmable Logic Controller.
5. the rotating shaft protection system of hoist drive mechanism according to claim 1; it is characterized in that; also comprise the indicator lamp that at least one controls by described controller (5), when there is breaking axis, this indicator lamp lighted by described controller (5).
6. the rotating shaft protection system of hoist drive mechanism according to claim 1; it is characterized in that; also comprise the siren horn controlled by described controller (5), when there is breaking axis, described controller (5) controls this siren horn and to give the alarm sound.
7. the rotating shaft guard method of a hoist drive mechanism; described hoist drive mechanism comprises servo-driver, by the servomotor of servo-driver control, the gear case of driven by servomotor and reel; the transmission of power that motor provides by gear case rotates to roll of tape movable reel; it is characterized in that, described method comprises the following steps:
S1: according to the velocity information of described servomotor and the transmitting ratio of described gear case, the theory that process obtains the rotating shaft of described reel in a time gap t1 runs stroke A;
S2: gather and process in start time of described time gap t1 and finish time, the difference of the rotating shaft run-length data of described reel, obtains the real-world operation stroke B of the rotating shaft of described time gap t1 inner drum;
S3: judge whether the theoretical absolute value running stroke A and real-world operation stroke B difference departs from presetting warning value C, if departed from, sends brake instruction, otherwise returns step S1.
8. rotating shaft guard method according to claim 7, is characterized in that, in described step S1, obtains the rotary speed information of described servomotor from described servo-driver; And described rotary speed information is multiplied by the rotating shaft rotating speed that transmitting ratio obtains described reel, and in described time gap t1, integration is carried out to this rotating shaft rotating speed, the described theory obtaining the rotating shaft of described reel in described time gap t1 runs stroke A.
9. rotating shaft guard method according to claim 8; it is characterized in that; in described step S2; by the stroke of the rotating shaft of reel described in displacement measuring device record; calculate the difference of the rotating shaft run-length data of reel described in described time gap t1 start time and finish time; obtain in described time gap t1, the real-world operation stroke B of the rotating shaft of described reel.
10. the rotating shaft guard method of the hoist drive mechanism according to any one of claim 7-9, it is characterized in that, in described step S3, when the absolute value judging that described theory runs stroke A and real-world operation stroke B difference is greater than described warning value C, be judged as off-axis, send brake instruction;
Also comprised before step S1: S0, presetting described time gap t1, described transmitting ratio and described warning value C.
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| CN201210057974.4A CN103303834B (en) | 2012-03-07 | 2012-03-07 | System and method for protecting rotating shaft of crane driving mechanism |
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| CN201210057974.4A CN103303834B (en) | 2012-03-07 | 2012-03-07 | System and method for protecting rotating shaft of crane driving mechanism |
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| CN103303834B true CN103303834B (en) | 2015-07-22 |
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| CN115417334B (en) * | 2022-08-05 | 2024-01-19 | 杭州大杰智能传动科技有限公司 | Broken shaft protection device and broken shaft protection method for tower crane |
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| CN201047803Y (en) * | 2007-05-18 | 2008-04-16 | 宝山钢铁股份有限公司 | Broken axis testing apparatus of universal axle |
| CN201901500U (en) * | 2010-11-24 | 2011-07-20 | 山东泰山天盾矿山机械有限公司 | Shaft breakage protective device for memorial archway type depth indicator of mine hoist |
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| CN103303834A (en) | 2013-09-18 |
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Address after: 518000 Guangdong province Futian District Shangbu Road West of the city of Shenzhen Shenzhen science and technology building 15 layer (1502-1504, 1506) Patentee after: CHINA NUCLEAR POWER TECHNOLOGY RESEARCH INSTITUTE Patentee after: China General Nuclear Power Corporation Address before: 518000 Guangdong, Futian District, Yitian Road, building A, block, building on the whole floor of A1301-1320 13 Patentee before: Zhongkehua Nuclear Power Technology Institute Co., Ltd. Patentee before: China Guangdong Nuclear Power Group Co., Ltd. |