Method for identifying overspeed failure of working machine, storage medium and processor

Abstract

The embodiment of the application provides a kind of for the identification method of engineering machinery overspeed failure, storage medium and processor.The method comprises the following steps: in the process of controlling winch mechanism to accelerate operation or deceleration operation, the current frequency of motor is acquired, and the current rotating speed of drum is acquired;Determine the operating time required for motor operation to current frequency;According to current frequency and operating time, determine the first current slope coefficient when motor accelerates operation or deceleration operation;According to current rotating speed, motor parameter of motor and operating time, determine the second current slope coefficient when motor accelerates operation or deceleration operation;Determine whether winch mechanism overspeed failure occurs according to the first current slope coefficient and the second current slope coefficient, can judge the overspeed failure of winch mechanism in the process of motor acceleration operation or deceleration operation, promptly determine whether winch mechanism overspeed failure occurs, ensure the safety of engineering machinery operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering machinery fault diagnosis, in particular to a method for identifying an overspeed fault of engineering machinery, a storage medium, a processor and engineering machinery. BACKGROUND

[0002] The hoisting mechanism is an important operating mechanism in the crane. In order to avoid major safety accidents caused by the failure of the transmission chain, the overspeed protection system is configured for the hoisting mechanism and the luffing mechanism of the large crane. At present, the industry usually adopts the method of arranging a mechanical code disc on the drum and arranging an inductive switch on the fixed components such as the chassis or the bearing seat. When the drum is running, the inductive switch transmits the on-off signal sensed to the overspeed protection relay. The overspeed protection relay calculates the actual running speed of the drum according to the on-off signal, and compares it with a certain speed threshold value preset in it, so as to judge whether the hoisting mechanism has an overspeed fault.

[0003] However, if the hoisting mechanism starts to overspeed at low speed, it will take a period of time before the overspeed speed continuously increases and exceeds the speed threshold value, and the hoisting mechanism can be identified as having an overspeed fault. That is, the above-mentioned method cannot timely identify whether the hoisting mechanism has an overspeed fault during the operation of the motor, so that the corresponding safety measures cannot be taken in time, and the safety of the hoisting mechanism during operation is low, and safety accidents are prone to occur. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a method for identifying an overspeed fault of engineering machinery, a storage medium, a processor and engineering machinery.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a method for identifying an overspeed fault of engineering machinery, the engineering machinery comprising a hoisting mechanism, the hoisting mechanism comprising a motor and a drum, the motor being connected with the drum, comprising:

[0006] In the process of controlling the hoisting mechanism to accelerate or decelerate, the current frequency of the motor and the current speed of the drum are obtained;

[0007] The running time required for the motor to run to the current frequency is determined;

[0008] The first current slope coefficient of the motor when accelerating or decelerating is determined according to the current frequency and the running time;

[0009] The second current slope coefficient of the motor when accelerating or decelerating is determined according to the current speed, the motor parameters of the motor and the running time;

[0010] Whether the hoisting mechanism has an overspeed fault is determined according to the first current slope coefficient and the second current slope coefficient.

[0011] In the embodiment of the present application, the first current slope coefficient of the motor during acceleration or deceleration is determined according to the current frequency and the running time, which includes: obtaining the initial frequency of the motor; determining the frequency difference between the initial frequency and the current frequency; determining the ratio between the frequency difference and the running time as the first current slope coefficient.

[0012] In the embodiment of the present application, the hoisting mechanism further includes a speed reducer, the speed reducer is connected with the motor and the drum respectively, the motor parameters include the pole pair number and the slip rate of the motor, and the second current slope coefficient of the motor during acceleration or deceleration is determined according to the current speed, the motor parameters of the motor and the running time, which includes: determining the speed difference between the initial speed and the current speed of the drum; obtaining the speed ratio of the speed reducer; and determining the second current slope coefficient according to the speed difference, the pole pair number, the speed ratio of the speed reducer, the running time and the slip rate.

[0013] In the embodiment of the present application, the second current slope coefficient is determined by formula (1):

[0014] F = | (n n -n c ) × p × i / ((60 × t) × (1-s%)) | (1)

[0015] Wherein, F refers to the second current slope coefficient, n n refers to the current speed of the drum, n c refers to the initial speed of the drum, p refers to the pole pair number of the motor, i refers to the speed ratio of the speed reducer, t refers to the running time, and s refers to the slip rate of the motor.

[0016] In the embodiment of the present application, the hoisting mechanism whether to occur overspeed failure is determined according to the first current slope coefficient and the second current slope coefficient, which includes: obtaining the preset slope coefficient of the motor during the execution of acceleration operation or deceleration operation; in the case that the first current slope coefficient is greater than the preset slope coefficient, it is determined that the motor and the drum both occur overspeed failure; in the case that the first current slope coefficient is equal to the preset slope coefficient and the second current slope coefficient is greater than the preset slope coefficient, it is determined that the motor does not occur overspeed failure and the drum occurs overspeed failure; in the case that the first current slope coefficient is equal to the preset slope coefficient and the second current slope coefficient is equal to the preset slope coefficient, it is determined that the motor and the drum both do not occur overspeed failure.

[0017] In the embodiment of the present application, the engineering machinery further includes a low-speed shaft braking device, the low-speed shaft braking device is connected with the drum, and the identification method further includes: in the case that the motor and the drum both occur overspeed failure, or the motor does not occur overspeed failure and the drum occurs overspeed failure, a braking instruction is sent to the low-speed shaft braking device to perform overspeed protection on the hoisting mechanism through the low-speed shaft braking device.

[0018] In the embodiment of the present application, the construction machine further comprises an alarm device, and the identification method further comprises: in the case that both the motor and the drum have an overspeed fault, or the motor does not have an overspeed fault and the drum has an overspeed fault, sending an alarm notification to the alarm device to issue an alarm prompt.

[0019] The second aspect of the present application provides a machine readable storage medium, the machine readable storage medium has instructions stored thereon, the instructions, when executed by a processor, cause the processor to be configured to perform the above-mentioned identification method for overspeed fault of construction machine.

[0020] The third aspect of the present application provides a processor configured to perform the above-mentioned identification method for overspeed fault of construction machine.

[0021] The fourth aspect of the present application provides a construction machine, comprising:

[0022] A hoisting mechanism, the hoisting mechanism comprising a motor and a drum, the motor being connected with the drum;

[0023] A speed reducer, the speed reducer being connected with the motor and the drum respectively;

[0024] A low-speed shaft braking device, the low-speed shaft braking device being connected with the drum;

[0025] An alarm device for receiving an alarm notification and issuing an alarm prompt; and

[0026] The above-mentioned processor.

[0027] Through the above technical solution, in the process of controlling the hoisting mechanism to accelerate or decelerate, the current frequency of the motor and the current rotating speed of the drum are obtained; the operating time required for the motor to operate to the current frequency is determined; the first current slope coefficient when the motor accelerates or decelerates is determined according to the current frequency and the operating time; the second current slope coefficient when the motor accelerates or decelerates is determined according to the current rotating speed, the motor parameters of the motor and the operating time; whether the hoisting mechanism has an overspeed fault is determined according to the first current slope coefficient and the second current slope coefficient, which can judge the overspeed fault of the hoisting mechanism in the process of accelerating or decelerating the motor, determine whether the hoisting mechanism has an overspeed fault in time, and ensure the safety of the operation of the construction machine.

[0028] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the drawings:

[0030] Figure 1 Fig. 1 schematically shows a flowchart of a method for identifying an overspeed failure of a construction machine according to an embodiment of the present application;

[0031] Figure 2 Fig. 2 schematically shows a diagram of a construction machine according to an embodiment of the present application;

[0032] Figure 3 Fig. 3 schematically shows an internal structure diagram of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the specific embodiments described herein are merely used to explain and illustrate the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0034] Figure 1 Fig. 1 schematically shows a flowchart of a method for identifying an overspeed failure of a construction machine according to an embodiment of the present application. As shown in Figure 1 In an embodiment of the present application, a method for identifying an overspeed failure of a construction machine is provided, including the following steps:

[0035] Step 101, during the process of controlling the hoisting mechanism to accelerate or decelerate, obtaining a current frequency of the motor and a current rotating speed of the drum.

[0036] Step 102, determining a running time required for the motor to run to the current frequency.

[0037] Step 103, determining a first current ramp coefficient of the motor when accelerating or decelerating according to the current frequency and the running time.

[0038] Step 104, determining a second current ramp coefficient of the motor when accelerating or decelerating according to the current rotating speed, motor parameters of the motor and the running time.

[0039] Step 105, determining whether the hoisting mechanism has an overspeed failure according to the first current ramp coefficient and the second current ramp coefficient.

[0040] The construction machine refers to a device capable of performing mechanical construction work. For example, the construction machine can be a crane. The construction machine includes a hoisting mechanism. The hoisting mechanism includes a motor and a drum. The motor is connected with the drum, and the motor can be used to drive the drum to run.

[0041] In the process of controlling the hoisting mechanism to accelerate or decelerate, the processor can obtain the current frequency of the motor and the current rotating speed of the drum. Specifically, a low-speed shaft rotating speed sensor can be installed on the drum, and the current rotating speed of the drum can be detected by the low-speed shaft rotating speed sensor and sent to the processor. The processor can determine the operating time required for the motor to operate to the current frequency. The operating time can also refer to the time required for the drum to operate from the initial rotating speed to the current rotating speed. For example, a timer can be installed in the engineering machinery or inside the motor or inside the drum. When the motor or the drum starts to operate, the timer can detect that the motor or the drum is running, at which time the timer starts to count. When the motor operates to the current frequency or the drum operates to the current rotating speed, the operating time required for the motor to operate to the current frequency or the drum to operate to the current rotating speed can be determined by the timer.

[0042] The processor can determine a first current ramp coefficient of the motor when the motor accelerates or decelerates according to the current frequency and the operating time. The processor can determine a second current ramp coefficient of the motor when the motor accelerates or decelerates according to the current rotating speed, the motor parameters of the motor, and the operating time. The motor parameters can include the number of pole pairs and the slip rate of the motor. After determining the first current ramp coefficient and the second current ramp coefficient, the processor can determine whether the hoisting mechanism has an overspeed failure according to the first current ramp coefficient and the second current ramp coefficient. Specifically, it can be determined whether the motor and the drum have an overspeed failure.

[0043] Through the above technical solution, in the process of controlling the hoisting mechanism to accelerate or decelerate, the current frequency of the motor and the current rotating speed of the drum are obtained, the operating time required for the motor to operate to the current frequency is determined, the first current ramp coefficient of the motor when the motor accelerates or decelerates is determined according to the current frequency and the operating time, the second current ramp coefficient of the motor when the motor accelerates or decelerates is determined according to the current rotating speed, the motor parameters of the motor, and the operating time, and whether the hoisting mechanism has an overspeed failure is determined according to the first current ramp coefficient and the second current ramp coefficient. The overspeed failure of the hoisting mechanism can be judged in the process of accelerating or decelerating the motor, and whether the hoisting mechanism has an overspeed failure can be determined in time to ensure the safety of the operation of the engineering machinery.

[0044] In one embodiment, determining the first current ramp coefficient of the motor when the motor accelerates or decelerates according to the current frequency and the operating time includes: obtaining an initial frequency of the motor; determining a frequency difference between the initial frequency and the current frequency; and determining the ratio between the frequency difference and the operating time as the first current ramp coefficient.

[0045] The processor can obtain an initial frequency of the motor, and can determine a frequency difference between the initial frequency and a current frequency. Then, the processor can determine a ratio between the frequency difference and the running time, and can determine the ratio as a first current ramp coefficient when the motor is accelerated or decelerated.

[0046] In one embodiment, the hoist mechanism further comprises a speed reducer connected with the motor and the drum respectively, the motor parameters comprise a pole pair number and a slip rate of the motor, and determining the second current ramp coefficient when the motor is accelerated or decelerated according to the current speed, the motor parameters of the motor and the running time comprises: determining a speed difference between an initial speed and a current speed of the drum; obtaining a speed ratio of the speed reducer; and determining the second current ramp coefficient according to the speed difference, the pole pair number, the speed ratio of the speed reducer, the running time and the slip rate.

[0047] The hoist mechanism further comprises a speed reducer connected with the motor and the drum respectively. The motor parameters comprise a pole pair number and a slip rate of the motor. The processor can determine a speed difference between an initial speed and a current speed of the drum. The processor can obtain a speed ratio of the speed reducer. Then, the processor can determine a second current ramp coefficient when the motor is accelerated or decelerated according to the speed difference, the speed ratio of the speed reducer, the pole pair number, the slip rate of the motor and a running time required for the motor to run to the current frequency.

[0048] In one embodiment, the second current ramp coefficient is determined by formula (1):

[0049] F = | (n n -n c ) × p × i / ((60 × t) × (1-s%)) | (1)

[0050] Wherein, F refers to the second current ramp coefficient, n n refers to the current speed of the drum, n c refers to the initial speed of the drum, p refers to the pole pair number of the motor, i refers to the speed ratio of the speed reducer, t refers to the running time, and s refers to the slip rate of the motor.

[0051] In one embodiment, determining whether the hoist mechanism has an overspeed failure according to the first current ramp coefficient and the second current ramp coefficient comprises: obtaining a preset ramp coefficient of the motor when performing the acceleration operation or the deceleration operation respectively; in a case where the first current ramp coefficient is greater than the preset ramp coefficient, determining that the motor and the drum both have the overspeed failure; in a case where the first current ramp coefficient is equal to the preset ramp coefficient and the second current ramp coefficient is greater than the preset ramp coefficient, determining that the motor does not have the overspeed failure and the drum has the overspeed failure; and in a case where the first current ramp coefficient is equal to the preset ramp coefficient and the second current ramp coefficient is equal to the preset ramp coefficient, determining that the motor and the drum both do not have the overspeed failure.

[0052] The processor can determine whether the hoisting mechanism has an overspeed failure according to the first current ramp coefficient and the second current ramp coefficient. Specifically, the processor can obtain a preset ramp coefficient of the motor when performing the acceleration operation or the deceleration operation. If the motor performs the acceleration operation, the obtained preset ramp coefficient can be an acceleration ramp coefficient, and if the motor performs the deceleration operation, the obtained preset ramp coefficient can be a deceleration ramp coefficient. Then, the processor can determine whether the hoisting mechanism has an overspeed failure according to the first current ramp coefficient, the second current ramp coefficient, and the preset ramp coefficient. If the first current ramp coefficient is greater than the preset ramp coefficient, the processor can determine that the motor and the drum both have an overspeed failure, i.e., the hoisting mechanism has an overspeed failure. If the first current ramp coefficient is equal to the preset ramp coefficient, and the second current ramp coefficient is greater than the preset ramp coefficient, the processor can determine that the motor does not have an overspeed failure, and the drum has an overspeed failure, i.e., the hoisting mechanism has an overspeed failure. If the first current ramp coefficient is equal to the preset ramp coefficient, and the second current ramp coefficient is equal to the preset ramp coefficient, the processor can determine that the motor and the drum both do not have an overspeed failure, i.e., the hoisting mechanism does not have an overspeed failure.

[0053] In one embodiment, the engineering machine further includes a low-speed shaft brake device connected with the drum, and the identification method further includes: in the case that it is determined that the motor and the drum both have an overspeed failure, or the motor does not have an overspeed failure and the drum has an overspeed failure, sending a brake instruction to the low-speed shaft brake device to protect the hoisting mechanism from overspeed by the low-speed shaft brake device.

[0054] The engineering machine further includes a low-speed shaft brake device connected with the drum, and the identification method further includes: in the case that it is determined that the motor and the drum both have an overspeed failure, or the motor does not have an overspeed failure and the drum has an overspeed failure, sending a brake instruction to the low-speed shaft brake device to protect the hoisting mechanism from overspeed by the low-speed shaft brake device.

[0055] In one embodiment, the engineering machine further includes an alarm device, and the identification method further includes: in the case that it is determined that the motor and the drum both have an overspeed failure, or the motor does not have an overspeed failure and the drum has an overspeed failure, sending an alarm notification to the alarm device to issue an alarm prompt.

[0056] The engineering machinery further comprises an alarm device. The alarm device can be a device with an alarm prompt function. For example, the alarm device can be an audible and visual alarm and a voice alarm. The audible and visual alarm can be an LED warning light, and the voice alarm can be a loudspeaker and a bell. When it is determined that the motor and the winding drum both have an overspeed failure, or the motor does not have an overspeed failure and the winding drum has an overspeed failure, the processor can send an alarm notification to the alarm device to issue an alarm prompt. If the alarm device is an LED warning light, the alarm prompt can be that the warning light flashes, and a voice prompt to stop running is issued. If the alarm device is a loudspeaker, the alarm prompt can be a voice prompt to stop running.

[0057] In one embodiment, if the initial running frequency of the motor is f c , the initial rotating speed of the winding drum is n c , the current running frequency of the motor is f n , the current rotating speed of the winding drum is n n , and if |(n n -n c )×p×i / ((60×t)×(1-s%))|=|(f n -f c ) / t|, it is determined that the hoisting mechanism does not have an overspeed failure, i.e., the motor and the winding drum both have an overspeed failure. Wherein, t refers to the time required for the motor to run from the initial running frequency to the current running frequency, or the time required for the winding drum to run from the initial rotating speed to the current rotating speed. p refers to the number of pole pairs of the motor, and s refers to the slip rate of the motor. If or , it is determined that the hoisting mechanism has an overspeed failure, specifically, the motor and the winding drum both have an overspeed failure. Wherein, refers to an acceleration ramp coefficient, refers to a deceleration ramp coefficient. If or , and or , it is determined that the hoisting mechanism has an overspeed failure, specifically, the motor does not have an overspeed failure, and the winding drum has an overspeed failure. If or , and or , it is determined that the hoisting mechanism does not have an overspeed failure, specifically, the motor and the winding drum both have an overspeed failure.

[0058] By the technical solution, the over-speed failure of the hoisting mechanism can be determined during acceleration or deceleration of the motor, and whether the over-speed failure of the hoisting mechanism occurs can be determined in time, so as to ensure the safety of the operation of the engineering machinery. Moreover, the over-speed protection can be performed in time by taking the braking measures, and the corresponding alarm notification can be sent, so as to ensure the safety of the operation of the engineering machinery and avoid accidents.

[0059] Figure 1 A flowchart of a method for identifying over-speed failure of engineering machinery in an embodiment is shown. It should be understood that, although the steps in the flowchart are shown in sequence according to the arrows, the steps are not necessarily executed in sequence according to the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other sequences. Moreover, Figure 1 the steps in the flowchart can include a plurality of sub-steps or a plurality of stages, and the sub-steps or the stages are not necessarily executed at the same time, but can be executed at different times. The execution sequence of the sub-steps or the stages is not necessarily sequential, but can be executed in rotation or alternation with at least a part of other steps or sub-steps or stages of other steps. Figure 1

[0060] In an embodiment, a storage medium is provided, and the storage medium stores a program which is executed by a processor to implement the method for identifying over-speed failure of engineering machinery.

[0061] In an embodiment, a processor is provided, and the processor is configured to run a program, wherein the program is executed to implement the method for identifying over-speed failure of engineering machinery.

[0062] In an embodiment, an engineering machinery is provided, and the engineering machinery comprises:

[0063] a hoisting mechanism, the hoisting mechanism comprising a motor and a winding drum, the motor being connected to the winding drum;

[0064] a speed reducer, the speed reducer being connected to the motor and the winding drum respectively;

[0065] a low-speed shaft braking device, the low-speed shaft braking device being connected to the winding drum;

[0066] an alarm device, configured to receive an alarm notification and send an alarm prompt; and

[0067] the processor described above.

[0068] ​Construction machinery refers to equipment capable of performing mechanical construction operations. For example, construction machinery can be a crane. Construction machinery includes a hoisting mechanism, a speed reducer, a low-speed shaft braking device, an alarm device, and a processor. The hoisting mechanism includes a motor and a drum, with the motor connected to the drum. The speed reducer is connected to both the motor and the drum. The motor drives the speed reducer, which in turn drives the drum. The low-speed shaft braking device, connected to the drum, provides overspeed protection for the hoisting mechanism. The alarm device receives alarm notifications and issues alarm prompts. The alarm device can be a device with alarm prompting functions. For example, the alarm device can be an audible and visual alarm or a voice alarm. An audible and visual alarm can be an LED warning light, and a voice alarm can be a horn or a siren.

[0069] In one embodiment, such as Figure 2 As shown, a schematic diagram of another type of engineering machinery is provided.

[0070] The construction machinery includes a motor, main brake, reducer, base frame, drum, low-speed shaft speed sensor, and low-speed shaft braking system. The main brake is connected to both the motor and reducer. The reducer is connected to the base frame and drum. The drum is connected to the low-speed shaft braking system and the low-speed shaft speed sensor. When the motor receives a signal and begins operation, the main brake opens, driving the reducer to run, which in turn drives the drum. Upon detecting an overspeed fault, overspeed protection can be provided through the main brake and low-speed shaft braking system. Specifically, the main brake can be closed, and the low-speed shaft braking system can be shut down to ensure the safe operation of the construction machinery.

[0071] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor A01, a network interface A02, memory (not shown), and a database (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The database stores data such as a first current ramp coefficient and a second current ramp coefficient. The network interface A02 communicates with external terminals via a network connection. When executed by the processor A01, the computer program B02 implements a method for identifying overspeed faults in engineering machinery.

[0072] Those skilled in the art can understand that Figure 3 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. A specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0073] The embodiment of the present application provides a device, the device comprising a processor, a memory and a program stored on the memory and executable on the processor, and the processor implements the following steps when executing the program: obtaining a current frequency of a motor and a current rotating speed of a drum during control of acceleration or deceleration of a hoisting mechanism; determining a running time required for the motor to run to the current frequency; determining a first current ramp coefficient of the motor during acceleration or deceleration of the motor according to the current frequency and the running time; determining a second current ramp coefficient of the motor during acceleration or deceleration of the motor according to the current rotating speed, motor parameters of the motor and the running time; and determining whether an overspeed fault occurs in the hoisting mechanism according to the first current ramp coefficient and the second current ramp coefficient.

[0074] In one embodiment, the determination of the first current ramp coefficient of the motor during acceleration or deceleration of the motor according to the current frequency and the running time comprises: obtaining an initial frequency of the motor; determining a frequency difference between the initial frequency and the current frequency; and determining a ratio between the frequency difference and the running time as the first current ramp coefficient.

[0075] In one embodiment, the hoisting mechanism further comprises a speed reducer connected with the motor and the drum respectively, the motor parameters comprise a pole pair number and a slip rate of the motor, and the determination of the second current ramp coefficient of the motor during acceleration or deceleration of the motor according to the current rotating speed, the motor parameters of the motor and the running time comprises: determining a rotating speed difference between an initial rotating speed of the drum and the current rotating speed of the drum; obtaining a speed ratio of the speed reducer; and determining the second current ramp coefficient according to the rotating speed difference, the pole pair number, the speed ratio of the speed reducer, the running time and the slip rate.

[0076] In one embodiment, the second current ramp coefficient is determined by formula (1):

[0077] F = | (n n -n c ) × p × i / ((60 × t) × (1-s %)) | (1)

[0078] Wherein, F refers to the second current ramp coefficient, n n refers to the current rotating speed of the drum, n c refers to the initial rotating speed of the drum, p refers to the pole pair number of the motor, i refers to the speed ratio of the speed reducer, t refers to the running time, and s refers to the slip rate of the motor.

[0079] In one embodiment, determining whether the hoisting mechanism has an overspeed failure according to the first current ramp coefficient and the second current ramp coefficient comprises: obtaining preset ramp coefficients of the motor when performing the acceleration operation or the deceleration operation, respectively; in a case where the first current ramp coefficient is greater than the preset ramp coefficient, determining that the motor and the drum both have the overspeed failure; in a case where the first current ramp coefficient is equal to the preset ramp coefficient and the second current ramp coefficient is greater than the preset ramp coefficient, determining that the motor does not have the overspeed failure and the drum has the overspeed failure; and in a case where the first current ramp coefficient is equal to the preset ramp coefficient and the second current ramp coefficient is equal to the preset ramp coefficient, determining that the motor and the drum both do not have the overspeed failure.

[0080] In one embodiment, the engineering machine further comprises a low-speed shaft brake device connected with the drum, and the identification method further comprises: in a case where it is determined that the motor and the drum both have the overspeed failure, or the motor does not have the overspeed failure and the drum has the overspeed failure, sending a brake instruction to the low-speed shaft brake device to perform overspeed protection on the hoisting mechanism by the low-speed shaft brake device.

[0081] In one embodiment, the engineering machine further comprises an alarm device, and the identification method further comprises: in a case where it is determined that the motor and the drum both have the overspeed failure, or the motor does not have the overspeed failure and the drum has the overspeed failure, sending an alarm notification to the alarm device to issue an alarm prompt.

[0082] The application also provides a computer program product adapted to execute the steps of the identification method for the overspeed failure of the engineering machine when executed on a data processing device.

[0083] Those skilled in the art will understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0084] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1one or more processes and / or blocks Figure 1 an apparatus with the functionality to achieve the specified function of a block or blocks.

[0085] These computer program instructions can 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 instructions which implement the Figure 1 one or more processes and / or blocks Figure 1 an apparatus with the functionality to achieve the specified function of a block or blocks.

[0086] These computer program instructions can 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 Figure 1 one or more processes and / or blocks Figure 1 an apparatus with the functionality to achieve the specified function of a block or blocks.

[0087] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0088] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the processor can execute instructions. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), or flash memory, for example. Memory is an example of computer readable media.

[0089] Computer readable media includes permanent and non-permanent, moveable and non- moveable media that can be implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media 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 programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disks (DVDs) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition provided herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0090] It should also be noted that the terms "comprising", "comprises" or other variations 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 can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0091] The above embodiments are only used to illustrate the present application, but not to limit it. Instead of the above, various modifications and changes can be made to the application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall into the scope of the claims of the application.

Claims

1. A method for identifying an overspeed failure of a working machine, characterized in that, The engineering machinery comprises a hoisting mechanism, the hoisting mechanism comprises a motor and a winding drum, the motor is connected with the winding drum, and the identification method comprises: During the control of the acceleration or deceleration of the hoisting mechanism, the current frequency of the motor and the current rotating speed of the winding drum are obtained; The operating time required for the motor to operate to the current frequency is determined; The first current slope coefficient of the motor during the acceleration or deceleration is determined according to the current frequency and the operating time; The second current slope coefficient of the motor during the acceleration or deceleration is determined according to the current rotating speed, the motor parameters of the motor and the operating time; Whether the hoisting mechanism has an overspeed fault is determined according to the first current slope coefficient and the second current slope coefficient.

2. A method for identifying an overspeed failure of a working machine according to claim 1, characterized in that, The first current slope coefficient of the motor during the acceleration or deceleration is determined according to the current frequency and the operating time, which comprises: The initial frequency of the motor is obtained; The frequency difference between the initial frequency and the current frequency is determined; The ratio between the frequency difference and the operating time is determined as the first current slope coefficient.

3. A method according to claim 1, c h a r a c t e r i z e d by, The hoisting mechanism further comprises a speed reducer, the speed reducer is connected with the motor and the winding drum respectively, the motor parameters comprise the number of pole pairs and the slip rate of the motor, and the second current slope coefficient of the motor during the acceleration or deceleration is determined according to the current rotating speed, the motor parameters of the motor and the operating time, which comprises: The rotating speed difference between the initial rotating speed of the winding drum and the current rotating speed is determined; The speed ratio of the speed reducer is obtained; The second current slope coefficient is determined according to the rotating speed difference, the number of pole pairs, the speed ratio of the speed reducer, the operating time and the slip rate.

4. A method according to claim 3, c h a r a c t e r i z e d by, The second current slope coefficient is determined by formula (1): F = | (n n -n c ) x p x i / ((60 x t) x (1 - s %)) | (1) where F is a second current ramping factor, n n is a current speed of the reel, n c is an initial speed of the reel, p is a pole pair number of the motor, i is a speed ratio of the speed reducer, t is a running time, and s is a slip rate of the motor.

5. A method according to claim 1, c h a r a c t e r i z e d by, Whether the hoisting mechanism has an overspeed fault is determined according to the first current slope coefficient and the second current slope coefficient, which comprises: The preset slope coefficient of the motor during the execution of the acceleration or deceleration work is obtained respectively; In the case that the first current slope coefficient is greater than the preset slope coefficient, it is determined that the motor and the winding drum both have an overspeed fault; In the case that the first current slope coefficient is equal to the preset slope coefficient, and the second current slope coefficient is greater than the preset slope coefficient, it is determined that the motor does not have an overspeed fault, and the winding drum has an overspeed fault; In the case that the first current slope coefficient is equal to the preset slope coefficient, and the second current slope coefficient is equal to the preset slope coefficient, it is determined that the motor and the winding drum both do not have an overspeed fault.

6. A method for identifying an overspeed failure of a working machine according to claim 5, characterized in that, The engineering machinery further comprises a low-speed shaft braking device, the low-speed shaft braking device is connected with the winding drum, and the identification method further comprises: In the case that the motor and the winding drum both have an overspeed fault, or the motor does not have an overspeed fault and the winding drum has an overspeed fault, a braking instruction is sent to the low-speed shaft braking device to protect the hoisting mechanism from overspeed by the low-speed shaft braking device.

7. A method according to claim 5, c h a r a c t e r i z e d by, The engineering machinery further comprises an alarm device, and the identification method further comprises: In a case where it is determined that both the motor and the drum have an overspeed fault, or the motor does not have an overspeed fault and the drum has an overspeed fault, an alarm notification is sent to the alarm device to issue an alarm prompt.

8. A machine-readable storage medium having stored thereon instructions, the instructions being executable by a machine to cause the machine to: The instructions, when executed by a processor, cause the processor to be configured to perform the method for identifying an overspeed fault of a working machine according to any one of claims 1 to 7.

9. A processor, comprising: The processor is configured to perform the method for identifying an overspeed fault of a working machine according to any one of claims 1 to 7.

10. A working machine, characterized in that Comprise: A hoisting mechanism, the hoisting mechanism comprising a motor and a drum, the motor being connected with the drum; A speed reducer, the speed reducer being connected with the motor and the drum respectively; A low-speed shaft braking device, the low-speed shaft braking device being connected with the drum; An alarm device for receiving an alarm notification and issuing an alarm prompt; and The processor according to claim 9.

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