CN110963415A - Hoisting machine and hoisting mechanism overspeed protection method, device and equipment thereof - Google Patents
Hoisting machine and hoisting mechanism overspeed protection method, device and equipment thereof Download PDFInfo
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- CN110963415A CN110963415A CN201911049404.9A CN201911049404A CN110963415A CN 110963415 A CN110963415 A CN 110963415A CN 201911049404 A CN201911049404 A CN 201911049404A CN 110963415 A CN110963415 A CN 110963415A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
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Abstract
The application discloses an overspeed protection method for a hoisting mechanism of a hoisting machine, which is applied to the hoisting machine, and comprises the following steps: acquiring a rotor electric frequency value of a hoisting motor of a hoisting mechanism; judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is the rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation; if the judgment result is yes, a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine is cut off, so that the hoisting motor is stopped. Therefore, when faults such as overspeed falling occur, the rotor electrical frequency value exceeds the preset overspeed frequency value, and when the rotor electrical frequency value exceeds the preset overspeed frequency value, the control coil loop of the main contactor of the main control loop of the hoisting machinery hoisting mechanism is cut off, so that the hoisting motor is stopped to avoid occurrence.
Description
Technical Field
The application relates to the technical field related to fault protection of hoisting machinery, in particular to hoisting machinery, and a hoisting mechanism overspeed protection method, device and equipment thereof.
Background
The hoisting mechanism of the hoisting machinery realizes the hoisting and descending of the load by the aid of a hoisting device and traction of a steel wire rope or a chain, and overspeed faults mainly occur in the descending process. In the descending process, the load has downward gravitational potential energy, the hoisting device provides mechanical torque with the upward direction but smaller than the gravitational potential energy of the load, and the slow descending of the load is realized. However, when the control device or mechanical part of the hoisting device fails, the hoisting device cannot continuously provide mechanical torque so that the load falls in an overspeed manner.
How to design a descending overspeed protection method which can be generally applied according to the current situation of the hoisting mechanism of the existing hoisting machinery is a problem to be solved urgently in the field of fault protection of the hoisting machinery.
Disclosure of Invention
The application aims to provide a hoisting machine and a hoisting mechanism overspeed protection method, device and equipment thereof, so as to solve the problem that how to design a descent overspeed protection method which can be generally applied according to the current situation of the hoisting mechanism of the existing hoisting machine in the related technology is urgently needed to be solved in the field of hoisting machine fault protection.
The purpose of the application is realized by the following technical scheme:
a hoisting mechanism overspeed protection method of a hoisting machine is applied to the hoisting machine. The overspeed protection method for the hoisting mechanism of the hoisting machinery comprises the following steps:
acquiring a rotor electric frequency value of a hoisting motor of a hoisting mechanism;
judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is a rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
and if so, cutting off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine so as to stop the hoisting motor.
Optionally, the hoisting machine includes: a frequency sensor;
the frequency sensor is used for detecting and outputting the rotor electric frequency value of the hoisting motor of the hoisting mechanism;
the method for acquiring the rotor electric frequency value of the hoisting motor of the hoisting mechanism comprises the following steps:
and acquiring the rotor electric frequency value output by the frequency sensor.
Optionally, the frequency sensor is installed on the winding side of the winding motor rotor.
Optionally, the determining whether the rotor electric frequency value exceeds a preset overspeed frequency value includes:
judging whether the rotor electric frequency value is 0 or not;
if the judgment result is yes, adding one to the number of the overspeed inflection points; wherein the initial value of the number of overspeed inflection points is 0;
when the number of times of the overspeed inflection points is singular, taking a negative value for the obtained rotor electric frequency value to obtain a first rotor electric frequency value;
judging whether the first rotor electric frequency value is smaller than the preset overspeed frequency value or not;
and if so, obtaining a judgment result that the rotor electric frequency value exceeds a preset overspeed frequency value.
Optionally, the method for calculating the preset overspeed frequency value includes:
subtracting a preset value from the rated overspeed frequency value of the preset multiple to obtain the preset overspeed frequency value; and subtracting the rotor electrical frequency value from the rotor electrical frequency value with the preset value being a preset multiple.
Optionally, the hoisting machine includes: a relay;
the relay control coil includes: a first end, a second end and a normally closed contact;
the first end is connected with a power supply; the second end is used for acquiring a control signal; the normally closed contact is connected into a control coil loop of a main contactor of a main control loop of the hoisting mechanism;
the control coil circuit for cutting off the main contactor of the main control circuit of the hoisting mechanism comprises:
and sending a control signal to the second end to control the relay to cut off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machinery.
A hoisting machine hoisting mechanism overspeed protection device is applied to hoisting machinery, and comprises:
the acquisition module is used for acquiring the rotor electric frequency value of the hoisting motor of the hoisting mechanism;
the judging module is used for judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is a rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
and the control module is used for cutting off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machinery if the judgment result is yes, so that the hoisting motor is stopped.
Optionally, the hoisting machine includes: a frequency sensor;
the frequency sensor is used for detecting and outputting the rotor electric frequency value of the hoisting motor of the hoisting mechanism;
the method for acquiring the rotor electric frequency value of the hoisting motor of the hoisting mechanism comprises the following steps:
and acquiring the rotor electric frequency value output by the frequency sensor.
Optionally, the frequency sensor is installed on the winding side of the winding motor rotor.
Optionally, the determining module is specifically configured to:
judging whether the rotor electric frequency value is 0 or not;
if the judgment result is yes, adding one to the number of the overspeed inflection points; wherein the initial value of the number of overspeed inflection points is 0;
when the number of times of the overspeed inflection points is singular, taking a negative value for the obtained rotor electric frequency value to obtain a first rotor electric frequency value;
judging whether the first rotor electric frequency value is smaller than the preset overspeed frequency value or not;
and if so, determining that the rotor electric frequency value exceeds a preset overspeed frequency.
Optionally, the method for calculating the preset overspeed frequency value includes:
subtracting a preset value from the rated overspeed frequency value of the preset multiple to obtain the preset overspeed frequency value; and subtracting the rotor electrical frequency value from the rotor electrical frequency value with the preset value being a preset multiple.
Optionally, a relay;
the relay control coil includes: a first end, a second end and a normally closed contact;
the first end is connected with a power supply; the second end is used for acquiring a control signal; the normally closed contact is connected into a control coil loop of a main contactor of a main control loop of the hoisting mechanism;
the control coil circuit for cutting off the main contactor of the main control circuit of the hoisting mechanism comprises:
and sending a control signal to the second end to control the relay to cut off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machinery.
A hoisting machine hoisting mechanism overspeed protection device is applied to hoisting machinery, and comprises: a processor, and a memory coupled to the processor;
the memory is used for storing a computer program;
the processor is configured to call and execute the computer program in the memory to perform a hoist overspeed protection method as provided herein.
Optionally, the method further includes: a frequency sensor, a relay and a button cell;
the processor and the memory are integrated to be a main control chip;
the main control chip is respectively connected with the frequency sensor and the relay;
the main control chip is provided with an input port, an RTC (real time clock), an output port, a power interface and a UART (universal asynchronous receiver transmitter);
the RTC is powered by the button battery, the power interface is used for externally connecting an isolation power supply which is rectified and accords with the voltage grade required by the main control chip, the input port is connected with the rotor electric frequency value output by the frequency sensor, and the output port is connected with the relay to output a control signal; the UART is used for connecting with a computer to perform data uploading and downloading communication.
A hoisting machine comprises a hoisting machine main body and the overspeed protection device of the hoisting mechanism of the hoisting machine.
This application adopts above technical scheme, has following beneficial effect:
the application provides an overspeed protection method for a hoisting mechanism of a hoisting machine, which comprises the following steps: firstly, acquiring a rotor electric frequency value of a hoisting motor of a hoisting mechanism; judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is the rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation; if the judgment result is yes, a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine is cut off, so that the hoisting motor is stopped. Therefore, when the rotor electric frequency value does not exceed the preset overspeed frequency value, the hoisting machine operates normally and operates at a descending speed not exceeding the preset multiple rated speed. When the rotor electrical frequency value exceeds the preset overspeed frequency value, the hoisting machinery drops at a speed exceeding the preset multiple rated drop speed, and because the preset multiple is the safety multiple specified in the safety regulation, the hoisting machinery may have faults such as overspeed drop when dropping at a speed exceeding the preset multiple rated drop speed. Through the scheme, the descending operation speed of the hoisting machinery can be always operated at the safe speed in the safety regulation, even if the hoisting machinery falls in an overspeed mode due to other reasons, the descending operation speed exceeds the safe-time rated descending operation speed in the safety regulation when the hoisting machinery falls in the overspeed mode, and the rotor electric frequency value exceeds the preset overspeed frequency value at the moment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for overspeed protection of a hoisting mechanism of a hoisting machine according to the present application.
Fig. 2 is a partial flowchart of a method for overspeed protection of a hoisting mechanism of a hoisting machine according to the present application.
Fig. 3 is a partial flow diagram of a hoisting mechanism overspeed protection device of a hoisting machine according to the present application.
Fig. 4 is a partial flow diagram of a hoist overspeed protection apparatus of a hoist according to the present application.
Fig. 5 is a partial flow diagram of another hoist overspeed protection apparatus of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
The hoisting mechanism of the hoisting machinery realizes the hoisting and descending of the load by the aid of a hoisting device and traction of a steel wire rope or a chain, and overspeed faults mainly occur in the descending process. In the descending process, the load has downward gravitational potential energy, the hoisting device provides mechanical torque with the upward direction but smaller than the gravitational potential energy of the load, and the slow descending of the load is realized. However, when the control device or mechanical part of the hoisting device fails, the hoisting device cannot continuously provide mechanical torque so that the load falls in an overspeed manner.
At present, three main methods for protecting the overspeed of a hoisting mechanism of a hoisting machine are provided: 1. the cam, the swing rod and the overspeed protection switch are arranged on the winding drum of the winding device, when the descending speed of the steel wire rope or the chain exceeds the set speed, the cam drives the swing rod to disconnect the overspeed switch, the power supply loop of the winding device is cut off, and overspeed protection is realized. The method has the defects that mechanical parts such as a cam swing rod and the like need to be additionally arranged on a winding drum of an original winding device of the hoisting machinery, the hoisting machinery is used as special equipment, a hoisting mechanism is very stable and mature in design and structure, and the mechanical parts additionally arranged on the original structure can reduce the stability of the hoisting mechanism and generate unpredictable danger. 2. The method has the advantages that speed measuring elements such as an encoder and the like are additionally arranged at the high-speed shaft end or the low-speed shaft end of the winding device, the original control system program needs to be changed, and the method cannot be directly applied to control systems such as a relay contactor and the like which cannot directly process pulse signals. 3. By additionally arranging the undercurrent relay at the power supply input end of the winding of the stator winding of the winding motor, when faults such as thyristor triggering failure and the like occur when the voltage regulation of the silicon controlled stator, the power supply of the silicon controlled and the power supply of the direct current unit are adopted, the current of the system can be reduced or zero, and the undercurrent relay acts to realize protection. Most of the existing hoisting mechanism control systems of hoisting machinery adopt a method for regulating the speed of a winding motor rotor by series resistance, and the method has narrow application range and no universality.
In order to solve the problems, the application provides a hoisting machine and a hoisting mechanism overspeed protection method, device and equipment thereof.
Examples
Referring to fig. 1, fig. 1 is a flow chart of a hoisting mechanism overspeed protection method of a hoisting machine according to the present application.
As shown in fig. 1, the overspeed protection method for a hoisting mechanism of a hoisting machine provided in this embodiment is applied to a hoisting machine, and the overspeed protection method for a hoisting mechanism of a hoisting machine includes:
s101, obtaining a rotor electric frequency value of a hoisting motor of a hoisting mechanism;
specifically, the hoisting machinery includes: a frequency sensor. The frequency sensor is an instrument for converting an input frequency into analog signals of dc current and voltage which are linearly output, and is an input member for acquiring analog quantities necessary for a power system, a remote control system, an automatic control system, and the like. The frequency sensor has wide application in the fields of electric power, light industry, chemical industry, textile, printing, machinery, metallurgy, telecommunication, traffic, automatic control, electronic computers and the like. The frequency sensor can accurately measure various frequencies such as low frequency, power frequency, high frequency and the like. The frequency sensor can acquire the rotor electrical frequency of the hoisting motor and convert the rotor electrical frequency into an analog quantity signal. Specifically, the analog signal may be a current type or a voltage type. In this application, frequency sensor is used for detecting and exporting hoisting mechanism hoist motor's rotor electric frequency value.
Specifically, the frequency sensor is arranged on the winding side of the winding motor rotor.
In step S101, obtaining a rotor electrical frequency value of a hoisting motor of a hoisting mechanism, specifically: and acquiring the rotor electric frequency value output by the frequency sensor.
S102, judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is the rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
it should be noted that, according to the current effective safety regulations (GB/T6067.1-2010) of hoisting machinery in China: the setting value of the overspeed switch depends on the performance of a control system and the rated descending speed, and is usually 1.25-1.4 times of the rated speed. In the scheme provided by the application, the preset multiple can be selected to be 1.25 times. Therefore, the rotor electric frequency value when the hoisting machinery runs at 1.25 times of the rated speed can be used as the preset overspeed frequency value, and the speed of the hoisting machinery can be guaranteed to run at 1.25 times of the rated speed as long as the rotor electric frequency value is guaranteed not to exceed the preset overspeed frequency value.
And S103, if the judgment result is yes, cutting off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine, so that the hoisting motor is stopped.
It should be noted that, when the control coil circuit of the main contactor of the main control circuit is disconnected based on the mechanical structure of the hoisting machine itself, the hoisting motor is stopped, that is: and stopping by a hoisting machine.
It should be noted that the hoisting machine includes: a relay;
the relay control coil includes: a first end, a second end and a normally closed contact;
the first end is connected with a power supply; the second end is used for acquiring a control signal; the normally closed contact is connected into a control coil loop of a main contactor of a main control loop of the hoisting mechanism;
in step S103: the control coil circuit of the main contactor of the main control circuit for cutting off the hoisting mechanism of the hoisting machinery comprises: and sending a control signal to the second end of the main contactor, and controlling a relay to cut off a control coil loop of the main contactor of a main control loop of the hoisting mechanism of the hoisting machinery. So set up, can be through control relay, whether the mechanical structure of control hoisting machinery self breaks off as the control coil return circuit of main control return circuit's main contactor. When the control coil loop of the main contactor is open, the hoisting machinery stops. Namely, the control relay controls the hoisting machinery to stop.
The application provides an overspeed protection method for a hoisting mechanism of a hoisting machine, which comprises the following steps: firstly, acquiring a rotor electric frequency value of a hoisting motor of a hoisting mechanism; judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is the rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation; if the judgment result is yes, a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine is cut off, so that the hoisting motor is stopped. Therefore, when the rotor electric frequency value does not exceed the preset overspeed frequency value, the hoisting machine operates normally and operates at a descending speed not exceeding the preset multiple rated speed. When the rotor electrical frequency value exceeds the preset overspeed frequency value, the hoisting machinery drops at a speed exceeding the preset multiple rated drop speed, and because the preset multiple is the safety multiple specified in the safety regulation, the hoisting machinery may have faults such as overspeed drop when dropping at a speed exceeding the preset multiple rated drop speed. Through the scheme, the descending operation speed of the hoisting machinery can be always operated at the safe speed in the safety regulation, even if the hoisting machinery falls in an overspeed mode due to other reasons, the descending operation speed exceeds the safe-time rated descending operation speed in the safety regulation when the hoisting machinery falls in the overspeed mode, and the rotor electric frequency value exceeds the preset overspeed frequency value at the moment.
In practical application, the specific calculation manner of the preset overspeed frequency value in step S102 is as follows:
according to the relation between the electrical frequency of the stator winding and the electrical frequency of the rotor winding of the motor, the following formula is shown:
frotating shaft＝S*fStator
Wherein: s represents the slip ratio of the motor、fStatorRepresenting the value of the stator electrical frequency, fRotating shaftRepresenting the rotor electrical frequency value.
The formula for calculating the motor speed is shown as follows:
wherein n represents the electron rotation speed, fStatorRepresenting the stator frequency, p representing the pole pair number, and S the motor slip.
The relationship between the rotational speed of the motor and the electrical frequency of the rotor obtained by integrating the above two equations is shown in the following equation,
the hoisting machinery hoisting mechanism motor uses power frequency voltage, fStatorGenerally 50Hz, and most speed regulating systems are non-variable frequency speed regulating systems. Recording the no-load rotor frequency of a hoisting motor as f'Rotating shaftAccording to the national current effective hoisting machinery safety regulation (GB/T6067.1-2010): the setting value of the overspeed switch depends on the performance of a control system and the rated descending speed, and is usually 1.25-1.4 times of the rated speed. On this basis, when the hoisting mechanism rotating speed is just 125% of the rated rotating speed, namely: in the present application, 1.25 times the rated descent speed is defined as the speed at which the descent overspeed occurs. At this time, the rotor frequency calculation equation is shown as follows, fRotating superRepresenting the rotor electrical frequency at which falling overspeed occurs, i.e.: the preset overspeed frequency value in this application.
fRotating super＝1.25*f'Rotating shaft-12.5
The value calculated by the above equation is generally a negative value, but this does not mean that the frequency is a negative value, but that the slip is a negative value. From the above, when the hoisting mechanism hangs the heavy object and continuously descends, the rotating speed is continuously increased, the slip ratio is continuously reduced, the rotor frequency is continuously reduced to the value of 0And then continues to increase. The value point of '0' of the rotor frequency is called as an overspeed inflection point, and the value point is less than f after the continuously increased frequency value is negativeRotating superDangerous overspeed occurs.
Fig. 2 is a partial flowchart of a method for overspeed protection of a hoisting mechanism of a hoisting machine according to the present application. Based on the above calculation manner, referring to fig. 2, determining whether the rotor electric frequency value exceeds a preset overspeed frequency value specifically includes:
s201, judging whether the rotor electric frequency value is 0;
s202, if the judgment result is yes, adding one to the number of overspeed inflection points; wherein the initial value of the number of overspeed inflection points is 0;
s203, when the number of times of the overspeed inflection point is singular, taking a negative value for the obtained rotor electric frequency value to obtain a first rotor electric frequency value;
s204, judging whether the first rotor electric frequency value is smaller than a preset overspeed frequency value;
s205, if the judgment result is yes, the rotor electric frequency value is considered to exceed the preset overspeed frequency value.
It should be noted that, in an actual application scenario, the rotor electrical frequency value may pass through 0 many times, so that the number of times of the overspeed inflection point on the rotor electrical frequency value is recorded, and it may be determined whether the rotor electrical frequency value should go to a positive value or take a negative value. For example: when the number of overspeed inflection points is 1, the rotor electric frequency value is shown to pass through 0, and the rotor electric frequency value is changed from a positive value to a negative value. When the number of overspeed inflection points is 2, the rotor electric frequency value crosses 2 times 0, and the rotor electric frequency value changes from a positive value to a negative value and then changes from the negative value to the positive value. When the number of times of the overspeed inflection point is 3, the rotor electric frequency value passes through 0 for 3 times, the rotor electric frequency value is changed from a positive value to a negative value, then is changed from the negative value to the positive value, and is changed from the positive value to the negative value again. In steps S201, S202, and S203, the positive and negative values of the rotor electrical frequency are determined based on the above principle. It should be noted that in practical applications, the overspeed inflection point does not occur multiple times.
After positive and negative values of the rotor electric frequency value are determined, whether the first rotor electric frequency value is smaller than a preset overspeed frequency value is judged; if the judgment result is yes, the judgment result that the rotor electric frequency value exceeds the preset overspeed frequency value is obtained.
Fig. 3 is a schematic structural diagram of an overspeed protection device for a hoisting mechanism of a hoisting machine according to the present application. The application provides a hoisting machinery hoisting mechanism overspeed protection device is applied to among the hoisting machinery. Referring to fig. 3, the overspeed protection device for hoisting mechanism of hoisting machinery comprises:
the obtaining module 301 is configured to obtain a rotor electrical frequency value of a hoisting motor of a hoisting mechanism;
a determining module 302, configured to determine whether the rotor electrical frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is the rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
and the control module 303 is configured to cut off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine if the judgment result is yes, so that the hoisting motor is stopped.
Fig. 4 is a schematic structural diagram of an overspeed protection device for a hoisting mechanism of a hoisting machine according to the present application. The application provides a hoisting machinery hoisting mechanism overspeed protection equipment is applied to among the hoisting machinery. Referring to fig. 4, the overspeed protection apparatus for a hoisting mechanism of a hoisting machine includes: a processor 401, and a memory 402 connected to the processor;
the memory 401 is used to store computer programs;
the processor 402 is configured to invoke and execute a computer program in a memory to perform the hoist overspeed protection method provided herein.
Fig. 5 is a schematic structural diagram of an overspeed protection device for a hoisting mechanism of a hoisting machine according to the present application. The application provides a hoisting machinery hoisting mechanism overspeed protection equipment is applied to among the hoisting machinery. Referring to fig. 5, the overspeed protection apparatus for a hoisting mechanism of a hoisting machine further includes: a frequency sensor 502, a relay 503 and a button cell 504;
the processor 402 and the memory 401 are integrally arranged as a main control chip 501;
the main control chip 501 is respectively connected with a frequency sensor 502 and a relay 503;
the main control chip 501 is provided with an input port, an RTC (real time clock), an output port, a power interface, and a UART (universal asynchronous receiver transmitter);
the RTC is powered by a button cell 504, a power supply interface is used for externally connecting an isolated power supply which is rectified and accords with the voltage grade required by the main control chip, an input port is connected with a rotor electric frequency value output by a frequency sensor 502, and an output port is connected with a relay 503 to output a control signal; the UART is used for connecting with a computer to perform data uploading and downloading communication.
The specific implementation of the overspeed protection device for a hoisting mechanism of a hoisting machine provided in the embodiment of the present application may refer to the implementation of the overspeed protection method for a hoisting mechanism of a hoisting machine in any of the above examples, and is not described herein again.
The application also provides hoisting machinery, including, hoisting machinery main part and the hoisting machinery hoisting mechanism overspeed protection equipment that this application provided.
For a specific implementation of the hoisting machine provided in the embodiment of the present application, reference may be made to the implementation manner of the overspeed protection method for a hoisting mechanism of the hoisting machine described in any of the above examples, and details are not described here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. The overspeed protection method for the hoisting mechanism of the hoisting machine is characterized by being applied to the hoisting machine and comprising the following steps:
acquiring a rotor electric frequency value of a hoisting motor of a hoisting mechanism;
judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is a rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
and if so, cutting off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machine so as to stop the hoisting motor.
2. A hoisting mechanism overspeed protection method of claim 1, wherein said hoisting mechanism comprises: a frequency sensor;
the frequency sensor is used for detecting and outputting the rotor electric frequency value of the hoisting motor of the hoisting mechanism;
the method for acquiring the rotor electric frequency value of the hoisting motor of the hoisting mechanism comprises the following steps:
and acquiring the rotor electric frequency value output by the frequency sensor.
3. The method of claim 2, wherein the frequency sensor is mounted on a winding side of a rotor of the hoisting motor.
4. The method for overspeed protection of a hoisting mechanism of a hoisting machine according to claim 1, wherein said determining whether the rotor electrical frequency value exceeds a preset overspeed frequency value comprises:
judging whether the rotor electric frequency value is 0 or not;
if the judgment result is yes, adding one to the number of the overspeed inflection points; wherein the initial value of the number of overspeed inflection points is 0;
when the number of times of the overspeed inflection points is singular, taking a negative value for the obtained rotor electric frequency value to obtain a first rotor electric frequency value;
judging whether the first rotor electric frequency value is smaller than the preset overspeed frequency value or not;
if the judgment result is yes, the rotor electric frequency value is considered to exceed the preset overspeed frequency value.
5. The hoisting mechanism overspeed protection method of claim 1, wherein the calculation of the preset overspeed frequency value comprises:
subtracting a preset value from the rated overspeed frequency value of the preset multiple to obtain the preset overspeed frequency value; and subtracting the rotor electrical frequency value from the rotor electrical frequency value with the preset value being a preset multiple.
6. A hoisting mechanism overspeed protection method of claim 1, wherein said hoisting mechanism comprises: a relay;
the relay control coil includes: a first end, a second end and a normally closed contact;
the first end is connected with a power supply; the second end is used for acquiring a control signal; the normally closed contact is connected into a control coil loop of a main contactor of a main control loop of the hoisting mechanism;
the control coil circuit for cutting off the main contactor of the main control circuit of the hoisting mechanism comprises:
and sending a control signal to the second end to control the relay to cut off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machinery.
7. A hoisting mechanism overspeed protection device of a hoisting machine is characterized by being applied to the hoisting machine, and comprises:
the acquisition module is used for acquiring the rotor electric frequency value of the hoisting motor of the hoisting mechanism;
the judging module is used for judging whether the rotor electric frequency value exceeds a preset overspeed frequency value; the preset overspeed frequency value is a rotor electric frequency value when the descending running speed of the hoisting mechanism is a preset multiple of rated descending running speed; wherein the preset multiple is a safety multiple specified in a safety regulation;
and the control module is used for cutting off a control coil loop of a main contactor of a main control loop of the hoisting mechanism of the hoisting machinery if the judgment result is yes, so that the hoisting motor is stopped.
8. A hoisting mechanism overspeed protection device of a hoisting machine is applied to the hoisting machine, and comprises: a processor, and a memory coupled to the processor;
the memory is used for storing a computer program;
the processor is configured to invoke and execute the computer program in the memory to perform a hoist overspeed protection method as recited in any one of claims 1-6.
9. The hoist overspeed protection device of claim 8, further comprising: a frequency sensor, a relay and a button cell;
the processor and the memory are integrated to be a main control chip;
the main control chip is respectively connected with the frequency sensor and the relay;
the main control chip is provided with an input port, an RTC (real time clock), an output port, a power interface and a UART (universal asynchronous receiver transmitter);
the RTC is powered by the button battery, the power interface is used for externally connecting an isolation power supply which is rectified and accords with the voltage grade required by the main control chip, the input port is connected with the rotor electric frequency value output by the frequency sensor, and the output port is connected with the relay to output a control signal; the UART is used for connecting with a computer to perform data uploading and downloading communication.
10. A hoisting machine comprising a hoisting machine body and a hoisting mechanism overspeed protection device of claim 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911049404.9A CN110963415A (en) | 2019-10-31 | 2019-10-31 | Hoisting machine and hoisting mechanism overspeed protection method, device and equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049404.9A CN110963415A (en) | 2019-10-31 | 2019-10-31 | Hoisting machine and hoisting mechanism overspeed protection method, device and equipment thereof |
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| CN110963415A true CN110963415A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN111634819A (en) * | 2020-06-19 | 2020-09-08 | 河南巨人起重机集团有限公司 | Crane overspeed protection method and system |
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