CN117023434A - Identification method, storage medium and processor for engineering machinery overspeed fault - Google Patents
Identification method, storage medium and processor for engineering machinery overspeed fault Download PDFInfo
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- CN117023434A CN117023434A CN202310779261.7A CN202310779261A CN117023434A CN 117023434 A CN117023434 A CN 117023434A CN 202310779261 A CN202310779261 A CN 202310779261A CN 117023434 A CN117023434 A CN 117023434A
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- 238000010276 construction Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 description 15
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/01—Winches, capstans or pivots
- B66D2700/0183—Details, e.g. winch drums, cooling, bearings, mounting, base structures, cable guiding or attachment of the cable to the drum
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- Control Of Electric Motors In General (AREA)
Abstract
The embodiment of the application provides an identification method, a storage medium and a processor for overspeed faults of engineering machinery. The method comprises the following steps: acquiring an action command sent by a user aiming at a hoisting mechanism according to a preset frequency, and controlling a frequency converter to operate according to the action command so as to sequentially drive a motor, a speed reducer and a winding drum to operate; acquiring the current output frequency of a frequency converter and the first current rotating speed of a winding drum; acquiring a first operation parameter of a motor and a second operation parameter of a speed reducer; determining an overspeed threshold value of the winding drum under the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient; and under the condition that the first current rotating speed is larger than the overspeed threshold value, determining that the engineering machinery has overspeed faults. Through the technical scheme, the corresponding overspeed threshold value can be determined according to the current output frequency of the frequency converter, whether overspeed faults occur in engineering machinery can be timely identified through the overspeed threshold value, so that safety measures can be timely taken, and the accident occurrence risk is reduced.
Description
Technical Field
The application relates to the field of engineering machinery fault diagnosis, in particular to an identification method for engineering machinery overspeed faults, a storage medium, a processor and engineering machinery.
Background
The hoisting mechanism is an important operation mechanism in the crane, and the hoisting mechanism and the boom pitching mechanism of the large crane are provided with an overspeed protection system in order to avoid serious safety accidents under the condition of failure of a transmission chain. At present, the mode of arranging a mechanical code disc on a winding drum, arranging an inductive switch on a fixed part such as an underframe or a bearing seat and the like is generally adopted in the industry, when the winding drum runs, the inductive switch transmits a sensed on-off signal to an overspeed protection relay, and the overspeed protection relay calculates the actual running rotating speed of the winding drum according to the on-off signal and compares the actual running rotating speed with a certain rotating speed threshold value preset in the overspeed protection relay, so that whether overspeed faults occur in the winding drum is judged.
However, if the hoisting mechanism starts to overspeed during low-speed operation, after a period of time, the overspeed fault of the hoisting can be identified when the overspeed is continuously increased and exceeds the rotation speed threshold value. Namely, whether the winch mechanism has overspeed faults or not is difficult to identify in time by the mode, so that corresponding safety measures cannot be taken in time, the safety of the winch mechanism is low during operation, and safety accidents are easy to occur.
Disclosure of Invention
The embodiment of the application aims to provide an identification method for engineering machinery overspeed faults, a storage medium, a processor and engineering machinery.
In order to achieve the above object, a first aspect of the present application provides a method for identifying an overspeed fault of an engineering machine, the engineering machine including a frequency converter and a hoisting mechanism, the hoisting mechanism including a motor, a speed reducer and a reel, the motor being connected to the frequency converter and the speed reducer, the reel being connected to the speed reducer, comprising:
acquiring an action command sent by a user aiming at a hoisting mechanism according to a preset frequency, and controlling a frequency converter to operate according to the action command so as to sequentially drive a motor, a speed reducer and a winding drum to operate;
acquiring the current output frequency of a frequency converter and the first current rotating speed of a winding drum;
acquiring a first operation parameter of a motor and a second operation parameter of a speed reducer;
determining an overspeed threshold value of the winding drum under the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient;
and under the condition that the first current rotating speed is larger than the overspeed threshold value, determining that the engineering machinery has overspeed faults.
In an embodiment of the present application, the first operation parameter includes a rated rotation speed of the motor and a fundamental frequency of the motor, the second operation parameter includes a speed reducer speed ratio, and determining an overspeed threshold value of the winding drum at the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient includes: determining the product between the rated rotation speed of the motor and the current output frequency as a first coefficient; determining the product between the fundamental frequency of the motor and the speed ratio of the speed reducer as a second coefficient; determining a first ratio between the first coefficient and the second coefficient; and determining an overspeed threshold value according to the first ratio and a preset coefficient.
In an embodiment of the present application, the overspeed threshold value is determined by the formula (1):
P＝k×n 0 ×f b0 / (f 0 ×i) (1)
wherein P is overspeed threshold, k is preset coefficient, n 0 Refers to the rated rotation speed f of the motor b0 Refers to the current output frequency, f 0 The motor fundamental frequency is referred to, and i is referred to as speed reducer speed ratio.
In an embodiment of the present application, the hoisting mechanism further includes a high-speed shaft rotation speed sensor, the high-speed shaft rotation speed sensor is mounted on the motor, and the method further includes: collecting a second current rotating speed of the motor through a high-speed shaft rotating speed sensor; determining a second ratio between a second current rotational speed and a speed ratio of the speed reducer; and under the condition that the first current rotating speed is equal to the second ratio and the second ratio is equal to the first ratio, determining that the engineering machinery normally operates.
In the embodiment of the application, the engineering machine further comprises an alarm device, and the method further comprises the following steps: after the overspeed fault of the engineering machinery is determined, the hoisting mechanism is controlled to stop running, and an alarm notification is sent to an alarm device so as to send an alarm prompt through the alarm device.
In an embodiment of the present application, sending an alarm notification to an alarm device to send an alarm prompt through the alarm device includes: determining a rotational speed difference between the current rotational speed and an overspeed threshold; determining a rotating speed interval in which the rotating speed difference value is positioned; determining the overspeed grade of the engineering machinery according to the rotating speed interval; and sending an alarm notification corresponding to the overspeed grade to an alarm device so as to send an alarm prompt.
In an embodiment of the present application, the winding mechanism further includes a low-speed shaft rotation speed sensor, the low-speed shaft rotation speed sensor is mechanically connected with the winding drum, and the obtaining the first current rotation speed of the winding drum includes: the first current rotational speed of the spool is obtained by a low speed shaft rotational speed sensor.
A second aspect of the application provides a machine-readable storage medium having stored thereon instructions that, when executed by a processor, cause the processor to be configured to perform the above-described method for identifying an overspeed fault of a work machine.
A third aspect of the application provides a processor configured to perform the above-described method for identifying an overspeed fault of a construction machine.
A fourth aspect of the present application provides a construction machine, comprising:
a frequency converter;
the hoisting mechanism comprises a motor, a speed reducer, a winding drum, a high-speed shaft rotating speed sensor and a low-speed shaft rotating speed sensor, wherein the motor is provided with the high-speed shaft rotating speed sensor and is respectively connected with the frequency converter and the speed reducer, the speed reducer is connected with the winding drum, and the winding drum is mechanically connected with the low-speed shaft rotating speed sensor;
the alarm device is used for receiving the alarm notification and sending an alarm prompt; and
the processor described above.
Through the technical scheme, when the action command is obtained once, the corresponding overspeed threshold value can be determined according to the current output frequency of the frequency converter, and whether overspeed faults occur in engineering machinery can be timely identified through the overspeed threshold value, so that corresponding safety measures can be timely taken, the operation safety of a hoisting mechanism is ensured, and the accident risk is greatly reduced.
Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. In the drawings:
FIG. 1 schematically illustrates a flow diagram of a method for identifying an overspeed fault of a construction machine according to an embodiment of the present application;
FIG. 2 schematically illustrates a flow chart of a method for identifying an overspeed fault of a work machine according to another embodiment of the present application;
FIG. 3 schematically illustrates a flow chart of a method for determining an overspeed fault component of a work machine in accordance with an embodiment of the present application;
FIG. 4 schematically illustrates a flow chart of a method for determining an overspeed failure component of a work machine, according to another embodiment of the present application;
FIG. 5 schematically illustrates a schematic view of a work machine according to an embodiment of the present disclosure;
fig. 6 schematically shows an internal structural view of a computer device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the detailed description described herein is merely for illustrating and explaining the embodiments of the present application, and is not intended to limit the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 schematically shows a flow chart of a method for identifying an overspeed fault of a construction machine according to an embodiment of the present application. As shown in fig. 1, in an embodiment of the present application, there is provided a method for identifying an overspeed fault of an engineering machine, the engineering machine including a frequency converter and a winding mechanism, the winding mechanism including a motor, a speed reducer, and a winding drum, the motor being connected to the frequency converter and the speed reducer, the winding drum being connected to the speed reducer, the method comprising the steps of:
Step 101, acquiring an action instruction aiming at a winding mechanism sent by a user according to a preset frequency, and controlling a frequency converter to operate according to the action instruction so as to sequentially drive a motor, a speed reducer and a winding drum to operate.
Step 102, obtaining the current output frequency of the frequency converter and the first current rotating speed of the winding drum.
Step 103, obtaining a first operation parameter of the motor and a second operation parameter of the speed reducer.
Step 104, determining an overspeed threshold value of the winding drum at the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and the preset coefficient.
And step 105, determining that the engineering machinery has overspeed faults under the condition that the first current rotating speed is larger than the overspeed threshold value.
The work machine is equipment capable of performing a machine construction operation. For example, the work machine may be a crane. The engineering machinery comprises a frequency converter and a hoisting mechanism. The winding mechanism comprises a motor, a speed reducer and a winding drum. The motor is connected with the frequency converter and the speed reducer respectively, and the speed reducer is connected with the winding drum. The motor can be used for driving the speed reducer to operate, so that the winding drum is driven to operate.
When an overspeed fault of the construction machine is identified, a user may send an action command for the hoisting mechanism to the processor. The processor may obtain the action instruction according to a preset frequency. The preset frequency can be customized according to actual conditions. If it is required to more timely identify whether the engineering machine has an overspeed fault, the preset frequency can be set smaller, for example, 1s. The processor can control the operation of the frequency converter according to the action instruction so as to drive the motor, the speed reducer and the winding drum to operate in sequence. The frequency converter may feed back its current output frequency to the processor when running. The first current rotational speed of the spool may also be fed back to the processor during operation.
The processor may obtain a current output frequency of the frequency converter and a first current rotational speed of the spool. The processor may obtain a first operating parameter of the motor and a second operating parameter of the speed reducer. The processor may then determine an overspeed threshold value for the spool at the current output frequency based on the first operating parameter, the second operating parameter, the current output frequency, and the preset coefficient. The processor may then compare the overspeed threshold value to the first current rotational speed. If the first current rotation speed is greater than the overspeed threshold value, the processor can determine that the engineering machinery has overspeed faults.
According to the technical scheme, the action instruction which is sent by a user and aims at the hoisting mechanism is obtained according to the preset frequency, and the frequency converter is controlled to operate according to the action instruction so as to drive the motor, the speed reducer and the winding drum to operate in sequence; acquiring the current output frequency of a frequency converter and the first current rotating speed of a winding drum; acquiring a first operation parameter of a motor and a second operation parameter of a speed reducer; determining an overspeed threshold value of the winding drum under the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient; under the condition that the first current rotating speed is larger than the overspeed threshold value, the overspeed fault of the engineering machinery is determined, and when an action command is obtained once, the corresponding overspeed threshold value can be determined according to the current output frequency of the frequency converter, and whether the overspeed fault of the engineering machinery occurs or not can be timely identified through the overspeed threshold value, so that corresponding safety measures can be timely taken, the operation safety of the hoisting mechanism is ensured, and the accident occurrence risk is greatly reduced.
In one embodiment, the first operating parameter includes a rated rotational speed of the motor and a fundamental frequency of the motor, the second operating parameter includes a speed reducer ratio, and determining an overspeed threshold value of the spool at the current output frequency based on the first operating parameter, the second operating parameter, the current output frequency, and the preset coefficient includes: determining the product between the rated rotation speed of the motor and the current output frequency as a first coefficient; determining the product between the fundamental frequency of the motor and the speed ratio of the speed reducer as a second coefficient; determining a first ratio between the first coefficient and the second coefficient; and determining an overspeed threshold value according to the first ratio and a preset coefficient.
The first operating parameter includes a motor rated speed and a motor fundamental frequency. The second operating parameter includes a speed reducer ratio. The processor may determine a product between the rated rotational speed of the motor and the current output frequency as a first coefficient and a product between the fundamental frequency of the motor and the speed ratio of the speed reducer as a second coefficient. The processor may then determine a first ratio between the first coefficient and the second coefficient. The processor may then determine an overspeed threshold value for the spool at the current output frequency based on the first ratio and the preset factor.
In one embodiment, the overspeed threshold is determined by equation (1):
P＝k×n 0 ×f b0 / (f 0 ×i) (1)
Wherein P is overspeed threshold, k is preset coefficient, n 0 Refers to the rated rotation speed f of the motor b0 Refers to the current output frequency, f 0 The motor fundamental frequency is referred to, and i is referred to as speed reducer speed ratio. The value of the preset coefficient k can be customized according to actual conditions. For example, k may be any number between 1.25 and 1.4.
In one embodiment, the hoisting mechanism further comprises a high speed shaft rotational speed sensor mounted on the motor, the method further comprising: collecting a second current rotating speed of the motor through a high-speed shaft rotating speed sensor; determining a second ratio between a second current rotational speed and a speed ratio of the speed reducer; and under the condition that the first current rotating speed is equal to the second ratio and the second ratio is equal to the first ratio, determining that the engineering machinery normally operates.
The hoisting mechanism also comprises a high-speed shaft rotating speed sensor. The high-speed shaft rotation speed sensor is arranged on the motor. The high speed shaft rotational speed sensor may be used to detect rotational speed when the motor is running. The processor may collect a second current rotational speed of the motor via the high speed shaft rotational speed sensor. The processor may determine a second ratio between the second current rotational speed and the speed ratio of the speed reducer. And under the condition that the first current rotating speed is equal to the second ratio and the second ratio is equal to the first ratio, the processor can determine that the engineering machinery normally operates. That is, no overspeed failure occurs in the construction machine at this time.
In one embodiment, the work machine further comprises an alarm device, the method further comprising: after the overspeed fault of the engineering machinery is determined, the hoisting mechanism is controlled to stop running, and an alarm notification is sent to an alarm device so as to send an alarm prompt through the alarm device.
The construction machine further comprises an alarm device. The alarm device can be equipment with an alarm prompt function. For example, the alarm device may be an audible and visual alarm, a voice alarm, or the like. The audible and visual alarm can be an LED warning lamp, and the voice alarm can be a loudspeaker, an alarm bell and the like. After determining that the engineering machinery has overspeed fault, the processor can control the hoisting mechanism to stop running and can send an alarm notification to the alarm device so as to send an alarm prompt through the alarm device. If the alarm device is an LED warning lamp, the alarm prompt can flash as the warning lamp and send out a voice prompt for stopping operation. If the alarm device is a loudspeaker, the alarm prompt can be a voice prompt for stopping operation.
In one embodiment, sending an alarm notification to an alarm device to issue an alarm alert by the alarm device comprises: determining a rotational speed difference between the current rotational speed and an overspeed threshold; determining a rotating speed interval in which the rotating speed difference value is positioned; determining the overspeed grade of the engineering machinery according to the rotating speed interval; and sending an alarm notification corresponding to the overspeed grade to an alarm device so as to send an alarm prompt.
The processor may determine a rotational speed difference between the current rotational speed and the overspeed threshold value, and may determine a rotational speed interval in which the rotational speed difference is located. The processor may then determine an overspeed grade of the work machine based on the speed interval. The processor may then send an alarm notification corresponding to the overspeed grade to the alarm device to issue an alarm prompt. For example, the rotation speed section may include a first section, a second section, and a third section. Wherein the upper limit of the first section is smaller than the lower limit of the second section, and the upper limit of the second section is smaller than the lower limit of the third section. If the rotational speed interval is the first interval, the overspeed grade of the construction machine can be determined to be the first grade. If the rotational speed interval is the second interval, the overspeed grade of the construction machine can be determined to be the second grade. If the rotation speed interval is the third interval, the overspeed grade of the construction machine can be determined to be the third grade. Wherein the first level is less than the second level, and the second level is less than the third level. If the overspeed grade is the third grade, the frequency of the alarm prompt can be set smaller, so that a user can hear more alarm prompts in a short time.
In one embodiment, the hoisting mechanism further comprises a low speed shaft rotational speed sensor mechanically coupled to the spool, the obtaining the first current rotational speed of the spool comprising: the first current rotational speed of the spool is obtained by a low speed shaft rotational speed sensor.
The hoisting mechanism further comprises a low-speed shaft rotation speed sensor. The low-speed shaft rotation speed sensor is mechanically connected with the winding drum. The low speed shaft rotational speed sensor may be used to detect rotational speed of the spool during operation. The processor may obtain a first current rotational speed of the spool via the low speed shaft rotational speed sensor. Because the low-speed shaft rotating speed sensor is mechanically connected with the winding drum, the phenomenon that signal acquisition is not timely caused by improper installation distance or loosening of the low-speed shaft rotating speed sensor in the operation process of the winding drum can be avoided, and therefore accuracy of identifying overspeed faults of engineering machinery is improved.
In one embodiment, the hoisting mechanism may further comprise a limiter and a coupling. The limiter is mechanically connected with the winding drum and the low-speed shaft rotating speed sensor respectively. The stopper may be connected to the end of the spool support shaft. If the winding drum is fixed with a gear, the winding drum can be driven to rotate by being meshed with the gear arranged on the input shaft of the limiter, so that the winding drum can run. The coupling is connected with the motor and the speed reducer respectively.
In one embodiment, as shown in FIG. 2, another flow diagram of a method for identifying an overspeed fault of a work machine is provided.
The engineering machinery comprises a frequency converter, a motor, a coupler, a speed reducer output and a rotary drum. The motor is equipped with a high speed shaft speed sensor and the spool is equipped with a low speed shaft speed sensor. When the overspeed fault of the engineering machinery is identified, the controller can send a control signal to the frequency converter, and the frequency converter can operate according to the control signal, so that the motor, the coupler, the speed reducer, the output of the speed reducer and the winding drum are sequentially driven to operate. The frequency converter may feed back its output frequency to the controller during operation. When the motor is in operation, the high-speed shaft rotating speed sensor can feed back the detected rotating speed of the motor to the controller. When the winding drum is in operation, the low-speed shaft rotating speed sensor can feed back the detected winding drum rotating speed to the controller. The controller can establish a dynamic rotating speed threshold corresponding to the instruction running speed according to the rotating speed of the winding drum, the rotating speed of the motor and the output frequency of the frequency converter, so that whether the engineering machinery fails or not can be timely identified.
Specifically, in one embodiment, the processor may be at a frequency f z And acquiring an instruction and sending the instruction to the frequency converter. The frequency converter can respond to the instruction to output the frequency f b0 And the frequency f b0 And feeding back to the processor. The processor may be based on kXn 0 ×f b0 /(f 0 X i) determining the corresponding dynamic rotational speed threshold of the spool. The frequency converter outputs a frequency f in response to the instruction b0 When the motor is operated to the rotation speed n 1 And the speed reducer can drive the winding drum to rotate. At this time, the low-speed shaft rotation speed sensor can detect the actual rotation speed n of the winding drum 2 And the actual rotation speed n of the winding drum 2 And feeding back to the processor. If the processor determines n 2 ＝n 1 /i＝n 0 ×f b0 /(f 0 X i), the engineering machinery normally operates, and overspeed faults do not occur. If the processor determines n 2 >k×n 0 ×f b0 /(f 0 X i), the engineering machine fails in overspeed. Wherein i refers to the speed reducer speed ratio of the speed reducer, n 0 The motor rated rotation speed is referred to, k is referred to as a drum overspeed threshold coefficient, and the value of the motor overspeed threshold coefficient can be customized according to actual conditions. For example, k may be any number from 1.25 to 1.4.
Through the technical scheme, when the action command is obtained once, the corresponding overspeed threshold value can be determined according to the current output frequency of the frequency converter, and whether overspeed faults occur in engineering machinery can be timely identified through the overspeed threshold value, so that corresponding safety measures can be timely taken, the operation safety of a hoisting mechanism is ensured, and the accident risk is greatly reduced. And the low-speed shaft rotating speed sensor is mechanically connected with the winding drum, so that the phenomenon that signal acquisition is not timely caused by improper installation distance or loosening of the low-speed shaft rotating speed sensor in the operation process of the winding drum can be avoided, and the accuracy of identifying overspeed faults of engineering machinery is improved. In addition, the overspeed grade of the engineering machinery can be determined, and corresponding alarm notices are sent according to different overspeed grades, so that corresponding alarm prompts are sent, and the operation safety of a hoisting mechanism is further ensured.
In one embodiment, a storage medium is provided having a program stored thereon, which when executed by a processor, implements the above-described method for identifying an overspeed fault of a work machine.
In one embodiment, a processor is provided for running a program, where the program executes the above-described method for identifying an overspeed fault of a work machine when running.
In one embodiment, there is provided a work machine including:
a frequency converter;
the hoisting mechanism comprises a motor, a speed reducer, a winding drum, a high-speed shaft rotating speed sensor and a low-speed shaft rotating speed sensor, wherein the motor is provided with the high-speed shaft rotating speed sensor and is respectively connected with the frequency converter and the speed reducer, the speed reducer is connected with the winding drum, and the winding drum is mechanically connected with the low-speed shaft rotating speed sensor;
the alarm device is used for receiving the alarm notification and sending an alarm prompt; and
the processor described above.
The work machine is equipment capable of performing a machine construction operation. For example, the work machine may be a crane. The engineering machinery comprises a frequency converter, a hoisting mechanism, an alarm device and a processor. The hoisting mechanism comprises a motor, a speed reducer, a winding drum, a high-speed shaft rotating speed sensor and a low-speed shaft rotating speed sensor. The motor is provided with a high-speed shaft rotation speed sensor. The high speed shaft rotational speed sensor may be used to detect rotational speed when the motor is running. The motor is connected with the frequency converter and the speed reducer respectively, the speed reducer is connected with the winding drum, and the winding drum is mechanically connected with the low-speed shaft rotating speed sensor. The low speed shaft rotational speed sensor may be used to detect rotational speed of the spool during operation. The motor can be used for driving the speed reducer to operate, so that the winding drum is driven to operate. The alarm device may be used to receive alarm notifications and issue alarm prompts. The alarm device can be a device with an alarm prompt function. For example, the alarm device may be an audible and visual alarm, a voice alarm, or the like. The audible and visual alarm can be an LED warning lamp, and the voice alarm can be a loudspeaker, an alarm bell and the like.
FIGS. 1-2 are flow diagrams of a method for identifying an overspeed fault of a work machine in one embodiment. It should be understood that, although the steps in the flowcharts of fig. 1-2 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-2 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or phases are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
In one embodiment, after an overspeed fault of the work machine is identified, a faulty component that causes the overspeed fault of the work machine may be further determined. Specifically, as shown in fig. 3, a method for determining an overspeed fault section of an engineering machine is provided, the engineering machine includes a frequency converter and a hoisting mechanism, the hoisting mechanism includes a motor, a speed reducer and a winding drum, the frequency converter is connected with the motor, the speed reducer is connected with the motor and the winding drum respectively, and the method includes the following steps:
Step 301, under the condition that the engineering machinery has overspeed fault, acquiring the current output frequency of the frequency converter and the operation parameters of the motor.
Step 302, determining a preset rotating speed of the motor at the current output frequency according to the operation parameter of the motor and the current output frequency under the condition that the current output frequency is located in the preset interval.
Step 303, obtaining the current rotation speed of the motor, and detecting whether the motor fails according to the preset rotation speed and the current rotation speed to obtain a failure detection result of the motor.
And step 304, determining a fault component which causes overspeed fault of the engineering machinery according to the fault detection result of the motor.
Under the condition that the overspeed fault of the engineering machinery is determined, the processor can acquire the current output frequency of the frequency converter and the operation parameters of the motor. The processor may then determine the interval in which the current output frequency is located. And under the condition that the current output frequency is in the preset interval, the processor can determine the preset rotating speed of the motor under the current output frequency according to the operation parameters of the motor and the current output frequency of the frequency converter. The processor can acquire the current rotating speed of the motor, and can detect whether the motor fails according to the preset rotating speed and the current rotating speed so as to obtain a failure detection result of the motor. The motor fault detection result comprises that the motor breaks down and the motor does not break down. The processor may then determine, based on the motor fault detection, the faulty component that caused the engineering machine to fail at overspeed. Specifically, the faulty component may also be a component that causes an overspeed fault in the hoisting mechanism.
In one embodiment, the method further comprises: acquiring preset frequency of a user sending an action instruction aiming at a hoisting mechanism; determining a first allowable coefficient and a second allowable coefficient of the frequency converter, wherein the first allowable coefficient is larger than the second allowable coefficient; and taking the products of the first allowable coefficient and the second allowable coefficient and the preset frequency as an upper limit value and a lower limit value of a preset interval respectively to determine the preset interval.
The processor may acquire a preset frequency at which the user transmits an action command for the hoisting mechanism. The preset frequency can be customized according to actual conditions. The processor may determine a first allowable coefficient and a second allowable coefficient of the frequency converter. The first allowable coefficient refers to an allowable coefficient of an upper limit value of the output of the frequency converter. The second allowable coefficient is an allowable coefficient of the lower limit value of the output of the frequency converter. The first allowable coefficient is greater than the second allowable coefficient. The processor may then determine a product of the first allowable coefficient and the predetermined frequency, and take the product as an upper limit value of the predetermined interval. The processor may determine a product of the second allowable coefficient and the preset frequency, and take the product as a lower limit value of the preset interval. After the upper limit value and the lower limit value of the preset interval are determined, the preset interval can be determined. For example, if the frequency is preset Is f z The first allowable coefficient is k 1 The second allowable coefficient is k 2 The preset interval is [ k ] 2 ×f z ，k 1 ×f z ]。
In one embodiment, the operating parameters include a rated rotational speed and a fundamental frequency of the motor, and determining the preset rotational speed of the motor at the current output frequency based on the operating parameters and the current output frequency of the motor includes: determining a ratio between a current output frequency and a fundamental frequency of the motor; the product between the ratio and the rated rotational speed of the motor is determined as a preset rotational speed.
The operating parameters include the rated rotational speed and fundamental frequency of the motor. In determining the preset rotational speed of the motor at the current output frequency, the processor may determine a ratio between the current output frequency and the fundamental frequency of the motor and determine a product between the ratio and the rated rotational speed of the motor. The processor may then determine the product as a preset rotational speed of the motor at the current output frequency. For example, if the rated rotational speed of the motor is n 0 The fundamental frequency of the motor is f 0 The current output frequency is f b0 The preset rotating speed of the motor is n 0 ×f b0 / 0 。
In one embodiment, detecting whether the motor fails according to the preset rotation speed and the current rotation speed to obtain a failure detection result of the motor includes: under the condition that the current rotating speed is equal to the preset rotating speed, determining that the fault detection result of the motor is that no fault occurs; and under the condition that the current rotating speed is not equal to the preset rotating speed, determining that the fault detection result of the motor is fault.
After determining the preset rotational speed of the motor at the current output frequency, the processor may compare the preset rotational speed with the current rotational speed of the motor. If the current rotating speed is equal to the preset rotating speed, the processor can determine that the fault detection result of the motor is that no fault occurs. If the current rotating speed is not equal to the preset rotating speed, the processor can determine that the fault detection result of the motor is that the motor is in fault.
In one embodiment, the engineering machine further includes a coupling connected to the motor and the speed reducer, and determining, according to a failure detection result of the motor, a failure component that causes an overspeed failure of the engineering machine includes: under the condition that the fault detection result of the motor is that no fault occurs, determining that the fault component is a speed reducer or a coupler; and under the condition that the fault detection result of the motor is that the motor is faulty, determining that the faulty component is the motor.
The construction machine further comprises a coupling. The coupling is connected with the motor and the speed reducer respectively. In the case that the failure detection result of the motor is that no failure occurs, the processor may determine that the failed component is a speed reducer or a coupling. In the case that the failure detection result of the motor is that a failure occurs, the processor may determine that the failed component is the motor.
In one embodiment, the hoisting mechanism further comprises a foundation brake, the engineering machine further comprises a low speed shaft brake device, the foundation brake is connected with the motor and the speed reducer respectively, the low speed shaft brake device is connected with the winding drum, and the method further comprises: under the condition that the fault part is determined to be a speed reducer or a coupler, closing a main brake and a low-speed shaft braking device so as to perform overspeed protection; in case it is determined that the faulty component is an electric motor, the foundation brake is controlled to be closed for overspeed protection.
The work machine further includes a low speed shaft brake. The hoisting mechanism further comprises a foundation brake. The main brake is respectively connected with the motor and the speed reducer. The low-speed shaft brake is connected with the winding drum. In the event that the faulty component is determined to be a speed reducer or coupling, the processor may control the foundation brake and the low shaft brake to close for overspeed protection. Specifically, overspeed protection may be performed on a hoisting mechanism of the construction machine. In the event that the faulty component is determined to be an electric motor, the processor may control the foundation brake to close for overspeed protection. Specifically, the overspeed protection may be performed on the hoisting mechanism of the construction machine.
In one embodiment, the hoisting mechanism further comprises a foundation brake connected to the motor and the speed reducer, respectively, the method further comprising: under the condition that the current output frequency is not in a preset interval, determining a fault component which causes overspeed fault of the engineering machinery as a frequency converter; the foundation brake is controlled to close for overspeed protection.
The hoisting mechanism further comprises a main brake, and the main brake is respectively connected with the motor and the speed reducer. And under the condition that the current output frequency is not in the preset interval, the processor can determine that the fault component which causes overspeed fault of the engineering machinery is a frequency converter. Specifically, the processor may determine that the fault component that caused the overspeed fault of the hoisting mechanism is a frequency converter. After this, the processor may further control the foundation brake to close for overspeed protection in order to secure the operation of the working machine. Specifically, overspeed protection can be performed on a hoisting mechanism of the engineering machinery.
In one embodiment, as shown in FIG. 4, a flow chart of another method for determining an overspeed fault component of a work machine is provided.
The controller can acquire the instruction frequency f z And acquiring the preset frequency of the action instruction of the hoisting mechanism, which is sent by the user. Then, if the controller determines the output frequency f of the frequency converter within the set time b0 Not satisfy k 2 ×f z ≤f b0 ≤k 1 ×f z The component causing the overspeed fault can be determined to be the fault of the frequency converter, the fault of the frequency converter can be reported, and the closing of the main brake is controlled, so that overspeed protection is realized. Wherein k is 1 The allowable coefficient k is output for the upper limit value of the frequency converter 2 And outputting a lower limit allowable coefficient for the frequency converter. If the controller determines the output frequency f of the frequency converter b0 Satisfy k 2 ×f z ≤f b0 ≤k 1 ×f z The controller can acquire the rotating speed n fed back by the motor encoder in a set time 1 . If n 1 ＝n 0 ×f b0 / 0 The controller may determine that the component causing the overspeed failure is a mechanical component failure such as a coupling or a speed reducer and control the low speed shaft brake system and the foundation brake to be closed. Wherein n is 0 For the rated rotational speed of the motor, f 0 Is the fundamental frequency of the motor. If n 1 ≠n 0 ×f b0 / 0 The controller can determine that the component causing the overspeed fault is a motor and can report the motor fault and control the closing of the foundation brake, thereby realizing overspeed protection.
Through the technical scheme, the fault component which causes overspeed fault of the engineering machinery can be timely determined, so that the engineering machinery is timely repaired and maintained, the maintenance cost of the engineering machinery is reduced, and the operation efficiency of the engineering machinery is further improved. And after the fault part is determined, braking measures can be timely adopted to perform overspeed protection, so that the operation safety of engineering machinery is ensured, and accidents are avoided.
In one embodiment, a storage medium having a program stored thereon that when executed by a processor implements the above-described method for determining an overspeed fault section of a work machine is provided.
In one embodiment, a processor is provided for running a program, wherein the program, when run, performs the above-described method for determining an overspeed failure component of a work machine.
In one embodiment, there is provided a work machine including:
a frequency converter;
the hoisting mechanism comprises a motor, a speed reducer, a coupler and a winding drum, the frequency converter is connected with the motor, the speed reducer is respectively connected with the motor and the winding drum, and the coupler is respectively connected with the motor and the speed reducer;
the main brake is respectively connected with the motor and the speed reducer;
the low-speed shaft braking device is connected with the winding drum; and
the processor described above.
The work machine is equipment capable of performing a machine construction operation. For example, the work machine may be a crane. The winding mechanism comprises a motor, a speed reducer, a coupler and a winding drum. The frequency converter is connected with the motor, the speed reducer is connected with the motor and the winding drum respectively, and the coupler is connected with the motor and the speed reducer respectively. The motor can be used for driving the speed reducer to operate, so that the coupler is driven to operate, and the winding drum is driven to operate. The main brake is respectively connected with the motor and the speed reducer. The low-speed shaft brake is connected with the winding drum. The foundation brake and the low-speed shaft brake device can be used for overspeed protection of a hoisting mechanism of the engineering machinery.
3-4 are flow diagrams of a method for determining an overspeed fault component of a work machine in one embodiment. It should be understood that, although the steps in the flowcharts of fig. 3-4 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 3-4 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
In one embodiment, as shown in FIG. 5, a schematic diagram of another work machine is provided.
The engineering machinery comprises a motor, a main brake, a speed reducer, a bottom frame, a winding drum, a low-speed shaft rotating speed sensor and a low-speed shaft braking system. The main brake is respectively connected with the motor and the speed reducer. The speed reducer is connected with an underframe and a winding drum. The winding drum is connected with a low-speed shaft braking system and a low-speed shaft rotating speed sensor. When the motor receives a signal to start running, the main brake is opened, so that the speed reducer is driven to run, and the winding drum is further driven to run. After identifying an overspeed failure of the work machine, the work machine may be overspeed protected by the foundation brake and the low speed shaft brake system. Specifically, the main brake can be controlled to be closed, and the low-speed shaft brake system can be controlled to be closed, so that the operation safety of the engineering machinery is ensured.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 6. The computer device includes a processor a01, a network interface a02, a memory (not shown) and a database (not shown) connected by a system bus. Wherein the processor a01 of the computer device is adapted to provide computing and control capabilities. The memory of the computer device includes internal memory a03 and nonvolatile storage medium a04. The nonvolatile storage medium a04 stores an operating system B01, a computer program B02, and a database (not shown in the figure). The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a04. The database of the computer device is used for storing data such as overspeed threshold values of the winding drum at the current output frequency. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program B02, when executed by the processor a01, implements a method for identifying an overspeed fault of a construction machine.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the program: acquiring an action command sent by a user aiming at a hoisting mechanism according to a preset frequency, and controlling a frequency converter to operate according to the action command so as to sequentially drive a motor, a speed reducer and a winding drum to operate; acquiring the current output frequency of a frequency converter and the first current rotating speed of a winding drum; acquiring a first operation parameter of a motor and a second operation parameter of a speed reducer; determining an overspeed threshold value of the winding drum under the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient; and under the condition that the first current rotating speed is larger than the overspeed threshold value, determining that the engineering machinery has overspeed faults.
In one embodiment, the first operating parameter includes a rated rotational speed of the motor and a fundamental frequency of the motor, the second operating parameter includes a speed reducer ratio, and determining an overspeed threshold value of the spool at the current output frequency based on the first operating parameter, the second operating parameter, the current output frequency, and the preset coefficient includes: determining the product between the rated rotation speed of the motor and the current output frequency as a first coefficient; determining the product between the fundamental frequency of the motor and the speed ratio of the speed reducer as a second coefficient; determining a first ratio between the first coefficient and the second coefficient; and determining an overspeed threshold value according to the first ratio and a preset coefficient.
In one embodiment, the overspeed threshold is determined by equation (1):
P＝k×n 0 ×f b0 / (f 0 ×i) (1)
wherein P is overspeed threshold, k is preset coefficient, n 0 Refers to the rated rotation speed f of the motor e0 Refers to the current output frequency, f 0 The motor fundamental frequency is referred to, and i is referred to as speed reducer speed ratio.
In one embodiment, the hoisting mechanism further comprises a high speed shaft rotational speed sensor mounted on the motor, the method further comprising: collecting a second current rotating speed of the motor through a high-speed shaft rotating speed sensor; determining a second ratio between a second current rotational speed and a speed ratio of the speed reducer; and under the condition that the first current rotating speed is equal to the second ratio and the second ratio is equal to the first ratio, determining that the engineering machinery normally operates.
In one embodiment, the work machine further comprises an alarm device, the method further comprising: after the overspeed fault of the engineering machinery is determined, the hoisting mechanism is controlled to stop running, and an alarm notification is sent to an alarm device so as to send an alarm prompt through the alarm device.
In one embodiment, sending an alarm notification to an alarm device to issue an alarm alert by the alarm device comprises: determining a rotational speed difference between the current rotational speed and an overspeed threshold; determining a rotating speed interval in which the rotating speed difference value is positioned; determining the overspeed grade of the engineering machinery according to the rotating speed interval; and sending an alarm notification corresponding to the overspeed grade to an alarm device so as to send an alarm prompt.
In one embodiment, the hoisting mechanism further comprises a low speed shaft rotational speed sensor mechanically coupled to the spool, the obtaining the first current rotational speed of the spool comprising: the first current rotational speed of the spool is obtained by a low speed shaft rotational speed sensor.
The application also provides a computer program product adapted to perform a program which, when executed on a data processing device, initiates the steps of an identification method for an overspeed fault of a construction machine.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The utility model provides a recognition method for engineering machine tool overspeed fault, its characterized in that, engineering machine tool includes converter and hoist mechanism, hoist mechanism includes motor, speed reducer and reel, the motor respectively with the converter with the speed reducer is connected, the reel with the speed reducer is connected, the method includes:
acquiring an action instruction aiming at the hoisting mechanism and sent by a user according to a preset frequency, and controlling the frequency converter to operate according to the action instruction so as to drive the motor, the speed reducer and the winding drum to operate in sequence;
acquiring the current output frequency of the frequency converter and the first current rotating speed of the winding drum;
acquiring a first operation parameter of the motor and a second operation parameter of the speed reducer;
determining an overspeed threshold value of the winding drum under the current output frequency according to the first operation parameter, the second operation parameter, the current output frequency and a preset coefficient;
And under the condition that the first current rotating speed is larger than the overspeed threshold value, determining that the engineering machinery has overspeed faults.
2. The method for identifying an overspeed fault of a construction machine of claim 1, wherein said first operating parameter includes a motor rated speed and a motor fundamental frequency, said second operating parameter includes a speed reducer ratio, and said determining an overspeed threshold value of said spool at said current output frequency based on said first operating parameter, said second operating parameter, said current output frequency, and a preset coefficient includes:
determining a product between the rated rotational speed of the motor and the current output frequency as a first coefficient;
determining a product between the fundamental frequency of the motor and the speed ratio of the speed reducer as a second coefficient;
determining a first ratio between the first coefficient and the second coefficient;
and determining the overspeed threshold according to the first ratio and the preset coefficient.
3. The identification method for an overspeed fault of a construction machine according to claim 2, characterized in that said overspeed threshold value is determined by the formula (1):
P＝k×n 0 ×f b0 / (f 0 ×i) (1)
wherein P is overspeed threshold, k is preset coefficient, n 0 Refers to the rated rotation speed f of the motor b0 Refers to the current output frequency, f 0 The motor fundamental frequency is referred to, and i is referred to as speed reducer speed ratio.
4. The method for identifying an overspeed fault of a construction machine of claim 2, wherein said hoisting mechanism further includes a high speed shaft rotational speed sensor mounted on said motor, said method further comprising:
collecting a second current rotating speed of the motor through the high-speed shaft rotating speed sensor;
determining a second ratio between the second current rotational speed and the speed reducer speed ratio;
and under the condition that the first current rotating speed is equal to the second ratio and the second ratio is equal to the first ratio, determining that the engineering machinery normally operates.
5. The method for identifying an overspeed fault of a construction machine of claim 1, wherein said construction machine further comprises an alarm device, said method further comprising:
after the overspeed fault of the engineering machinery is determined, the hoisting mechanism is controlled to stop running, and an alarm notification is sent to the alarm device so as to send an alarm prompt through the alarm device.
6. The method of claim 5, wherein the sending an alarm notification to the alarm device to send an alarm alert via the alarm device comprises:
Determining a rotational speed difference between the current rotational speed and the overspeed threshold;
determining a rotating speed interval in which the rotating speed difference value is positioned;
determining the overspeed grade of the engineering machinery according to the rotating speed interval;
and sending an alarm notification corresponding to the overspeed grade to the alarm device so as to send an alarm prompt.
7. The method for identifying an overspeed fault of a construction machine according to any one of claims 1 to 6, characterized in that said hoisting mechanism further comprises a low-speed shaft rotation speed sensor mechanically connected to said winding drum, said obtaining a first current rotation speed of said winding drum comprising:
and acquiring a first current rotating speed of the winding drum through the low-speed shaft rotating speed sensor.
8. A machine-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to be configured to perform the identification method for an engineering machine overspeed fault of any one of claims 1 to 7.
9. A processor configured to perform the identification method for an overspeed fault of a construction machine according to any one of claims 1 to 7.
10. A construction machine, comprising:
a frequency converter;
the hoisting mechanism comprises a motor, a speed reducer, a winding drum, a high-speed shaft rotating speed sensor and a low-speed shaft rotating speed sensor, wherein the motor is provided with the high-speed shaft rotating speed sensor, the motor is respectively connected with the frequency converter and the speed reducer, the speed reducer is connected with the winding drum, and the winding drum is mechanically connected with the low-speed shaft rotating speed sensor;
the alarm device is used for receiving the alarm notification and sending an alarm prompt; and
the processor of claim 9.
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| CN202310779261.7A CN117023434A (en) | 2023-06-28 | 2023-06-28 | Identification method, storage medium and processor for engineering machinery overspeed fault |
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