CN110609578A - Temperature protection method, device and system for mechanical equipment - Google Patents
Temperature protection method, device and system for mechanical equipment Download PDFInfo
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- CN110609578A CN110609578A CN201910897194.2A CN201910897194A CN110609578A CN 110609578 A CN110609578 A CN 110609578A CN 201910897194 A CN201910897194 A CN 201910897194A CN 110609578 A CN110609578 A CN 110609578A
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The application relates to a temperature protection method, a device and a system for mechanical equipment. The method comprises the following steps: acquiring a temperature signal sent by a temperature transmitter, and judging whether the temperature signal is within a preset temperature threshold range; if the temperature signal is within the temperature threshold range, calculating the absolute value of the temperature change rate based on the temperature signal at the current moment and the temperature signal at the previous moment; judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not; if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold, judging whether the temperature signal exceeds a preset temperature protection threshold; and if the temperature signal exceeds the temperature protection threshold value, sending a shutdown instruction to the mechanical equipment. According to the technical scheme, due to the fact that various judgment information is added, abnormal conditions such as disconnection or disconnection of the data transmission line of the temperature signal and temperature mutation can be fully considered, and equipment halt caused by the abnormal conditions can be reduced to a certain extent.
Description
Technical Field
The application relates to the technical field of automation, in particular to a temperature protection method, device and system for mechanical equipment.
Background
In industrial production, various mechanical devices are involved, and a production line comprises main machine devices such as kilns, mills and the like by taking the novel dry-process cement production as an example. When the mechanical equipment runs, the contained motor windings, bearings, sliding shoes, thrust shoes and other structures generate heat due to friction or other reasons. In order to protect the equipment from damage by the heat generated by itself, it is therefore necessary to monitor the real-time temperature of the structure in the equipment which is susceptible to heat generation, so as to shut down the equipment when the temperature exceeds a set value.
In the related art, the temperature signal can be transmitted to a control system for processing and protecting the equipment through a PT100 thermal resistor and a field transmitter which are installed on the equipment. However, in the prior art, the temperature protection of the device does not take into account various abnormal situations that may occur, such as loose of the connection terminal of the temperature protection device, disconnection or disconnection of the data line, etc., so that the abnormal situations may occur to cause abnormal shutdown of the device, thereby being unfavorable for normal production.
Disclosure of Invention
In order to solve the above problems, the present application provides a method, an apparatus, and a system for protecting a temperature of a mechanical device, so as to fully consider an abnormal situation of the temperature protection device when performing temperature protection on the mechanical device, thereby reducing a shutdown of the mechanical device caused by the abnormal situation to a certain extent.
The above object of the present application is achieved by the following technical solutions:
in a first aspect, an embodiment of the present application provides a method for protecting a temperature of a mechanical device, where the method includes:
acquiring a temperature signal sent by a temperature transmitter, and judging whether the temperature signal is within a preset temperature threshold range;
if the temperature signal is within the temperature threshold range, calculating an absolute value of a temperature change rate based on the temperature signal and the temperature signal at the previous moment;
judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not;
if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold, judging whether the temperature signal exceeds a preset temperature protection threshold;
and if the temperature signal exceeds the temperature protection threshold value, sending a shutdown instruction to mechanical equipment.
Optionally, the method further includes:
if the absolute value of the temperature change rate is larger than the temperature change rate threshold, starting timing, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold;
and restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches a preset delay time.
Optionally, the method further includes:
and if the temperature signal exceeds the temperature threshold range, sending a first alarm signal.
Optionally, the method further includes:
and if the absolute value of the temperature change rate is greater than the temperature change rate threshold value, sending a second alarm signal.
Optionally, the method further includes:
acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user;
starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction;
or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
In a second aspect, an embodiment of the present application further provides a temperature protection device for a mechanical device, where the device includes:
the temperature acquisition module is used for acquiring a temperature signal sent by the temperature transmitter and judging whether the temperature signal is within a preset temperature threshold range;
the calculation module is used for calculating the absolute value of the temperature change rate based on the temperature signal and the temperature signal at the previous moment if the temperature signal is within the temperature threshold range;
the first judgment module is used for judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not;
the second judgment module is used for judging whether the temperature signal exceeds a preset temperature protection threshold value or not if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold value;
and the sending module is used for sending a shutdown instruction to mechanical equipment if the temperature signal exceeds the temperature protection threshold value.
Optionally, the apparatus further comprises:
the temporary stopping module is used for starting timing if the absolute value of the temperature change rate is greater than the temperature change rate threshold value, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold value;
and the restarting module is used for restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches the preset delay time.
Optionally, the apparatus further comprises:
the second acquisition module is used for acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user;
the processing module is used for starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction; or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
In a third aspect, an embodiment of the present application further provides a temperature protection system for a mechanical device, where the system includes: the device comprises a control device, a temperature sensor and a temperature transmitter;
the control device comprises a memory and a processor connected with the memory; the memory is used for storing a program, and the program is at least used for executing the temperature protection method of the mechanical equipment; the processor is used for calling and executing the program stored in the memory;
the temperature sensor is used for acquiring temperature information of mechanical equipment;
and the temperature transmitter is used for converting the temperature information acquired by the temperature sensor into a temperature signal which can be identified by the control equipment.
Optionally, the system further includes: a time delay relay;
the time delay relay is used for storing time delay set by a user, and starting timing when the temperature signal is determined to be in the temperature threshold range until the timing time reaches the time delay, and sending a trigger signal to the control equipment so that the control equipment starts to judge whether the temperature signal exceeds a preset temperature protection threshold value again;
the program stored in the memory of the control device is also used for executing the temperature protection method of the mechanical device comprising the time delay processing step.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the technical scheme of the embodiment of the application, after the temperature transmitter acquires the temperature signal data of the mechanical equipment, before judging whether the temperature signal data exceeds the set temperature protection threshold value, firstly judging whether the temperature signal data is positioned in the acceptable normal temperature range of the control equipment, thereby judging whether the abnormal conditions such as disconnection or disconnection occur in the transmission process of the temperature signal data, then by judging whether the temperature change rate of the temperature signal data in unit time is within the normal temperature change rate range, so that it can be judged whether the temperature of the mechanical equipment has sudden change or not, that is, during temperature protection, by adding various judgment information, abnormal conditions such as disconnection or disconnection of a data transmission line and temperature mutation can be fully considered, and equipment halt caused by the abnormal conditions can be further reduced to a certain extent.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flow chart of a method for protecting a mechanical device from temperature according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a concept of a method for protecting a temperature of a mechanical device according to a second embodiment of the present disclosure;
fig. 3 is a schematic diagram of an analog quantity processing process of a temperature protection method for a mechanical device according to a second embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a temperature protection device of a mechanical apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a temperature protection system of a mechanical device according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Before explaining the technical solution of the present application in detail, a conventional temperature protection method for mechanical equipment and the problems thereof will be explained first.
In a conventional temperature protection method for mechanical equipment, a PT100 thermal resistor and a field transmitter mounted on the equipment can transmit a temperature signal to a control system for processing, and when the temperature signal exceeds a set normal range, the mechanical equipment is controlled to stop in time, so as to protect the equipment. However, during the operation of the device, various abnormal conditions may occur, for example, in the operation of the motor winding, the bearing, the shoe and other structures of the device, loosening of the connection terminal or wear-through of the primary element circuit may occur due to mechanical vibration, or a platinum resistance wire may be broken due to vibration due to the quality problem of the PT100 thermal resistor, and in addition, the data transmission line may be short-circuited or broken due to human or other accidents, and the above abnormal conditions may cause the temperature signal acquired by the control system not to be the actual temperature signal, further may cause the control system to make a misjudgment so as to abnormally stop the mechanical device, and are not favorable for the production work. In the prior art, the temperature protection of the equipment does not consider the abnormal condition, so that the normal and stable operation of mechanical equipment is not facilitated.
In view of the above problems existing in the field, if not solved, the temperature protection of the mechanical equipment cannot be effectively carried out, and further the production may be seriously affected. However, if the hardware is modified, the cost is high and the implementation workload is large, so that the scheme firstly provides a temperature protection method for the mechanical equipment from the software control mode of the temperature protection system.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a temperature protection method for a mechanical device according to an embodiment of the present disclosure. As shown in fig. 1, the method comprises the steps of:
s101: acquiring a temperature signal sent by a temperature transmitter, and judging whether the temperature signal is within a preset temperature threshold range;
specifically, since the control system generally needs to receive analog signals such as current or voltage, and the temperature measured by a conventional PT100 thermal resistance sensor is actually a resistance signal, the signal measured by the temperature sensor needs to be converted by a temperature transmitter before being sent to the control system for processing. The temperature transmitter is used as a secondary measuring element, obtains signals from a temperature measuring element (temperature sensor) to a transmitter module, and converts the signals into 4-20 mA current signals 0-5V/0-10V voltage signals which are in linear relation with temperature after the signals are processed by circuits such as voltage stabilizing filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection, so that a control system can analyze and process the signals. That is, the temperature signal in step S101 is not an actual temperature value, but may be a current value or a voltage value having a linear correspondence relationship with the temperature value, and the specific value of the current or the voltage depends on the type and the signal of the specific control device selected, for example, in this embodiment, the PLC controller of siemens S7-300 may be selected as the control device, and the temperature signal may be a current signal of 4 to 20 mA.
In addition, the preset temperature threshold range refers to the maximum range of the temperature signal which the control device should acquire when the temperature detection and the transmission process of the temperature signal are normal, and taking the PLC controller of siemens S7-300 as an example, the preset temperature threshold range refers to the temperature range corresponding to the current signal of 4-20 mA.
S102: if the temperature signal is within the temperature threshold range, calculating an absolute value of a temperature change rate based on the temperature signal and the temperature signal at the previous moment;
specifically, the method for calculating the absolute value of the temperature change rate may be: firstly, the difference is made between the current temperature signal and the temperature signal at the previous moment, the absolute value of the difference is taken, and then the time difference between the current moment and the previous moment is divided. Of course, the difference between the current temperature signal and the previous temperature signal may be directly divided by the time difference between the current time and the previous time, and finally the absolute value may be obtained. That is, the process of calculating the absolute value of the temperature change rate is not limited as long as the desired result can be obtained.
In addition, if the temperature signal exceeds the temperature threshold range, it can be determined that an accident occurs in the temperature detection or temperature signal transmission process, for example, a short circuit or an open circuit occurs in a data line, and at the moment, a first alarm signal can be sent out to prompt a user to check and eliminate the abnormal condition in time. The alarm signal may be a voice alarm signal or a light alarm signal, and may be implemented by an audible and visual alarm, for example.
Further, taking the temperature signal as a current signal actually, in general, if the temperature signal is smaller than the minimum value of the preset temperature threshold range (i.e., the current is too small), it may be determined that an open circuit occurs in the acquisition and transmission process of the temperature signal, for example, the data line is broken, whereas if the temperature signal is larger than the maximum value of the preset temperature threshold range (i.e., the current is too large), it may be determined that a short circuit occurs in the acquisition and transmission process of the temperature signal, for example, the insulation degree of the data cable is decreased. Thus, related maintenance personnel can conduct targeted investigation and repair.
S103: judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not;
specifically, when the device is operated, the temperature rise of the bearing, the slipper, the thrust shoe, the motor winding and other structures of the host device is a slow process, and finally the temperature rise can slowly reach the rated temperature rise (small fluctuation in a certain temperature range) in normal operation, that is, the normal temperature change rate (absolute value) should not exceed the set temperature change rate threshold, if the temperature change rate (absolute value) at a certain moment exceeds the temperature change rate threshold, it can be determined that abnormality occurs in the operation process of the device, that is, the temperature is suddenly changed, and at this time, a second alarm signal should be sent to the user. The second alarm signal can be set to be different from the first alarm signal (which is sent when the data signal exceeds the preset temperature threshold range), so that maintenance personnel can better check abnormal conditions.
Further, the method may further include: if the absolute value of the temperature change rate is larger than the temperature change rate threshold, starting timing, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold; and restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches a preset delay time.
That is, after the control device determines that the temperature change rate exceeds the set value, the control device may temporarily stop (i.e., delay) the temperature protection when a maintenance worker checks the temperature change rate, so as to avoid that the temperature signal is abnormal to cause the shutdown of the device and affect the production, but the delay time cannot be too long, otherwise, the temperature of the mechanical device is actually abnormal after the mechanical device is operated for a long time, and the device is damaged. After the delay time is over, the control equipment automatically protects the temperature of the mechanical equipment again.
S104: if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold, judging whether the temperature signal exceeds a preset temperature protection threshold;
s105: and if the temperature signal exceeds the temperature protection threshold value, sending a shutdown instruction to mechanical equipment.
That is to say, if the absolute value of the temperature change rate calculated by the temperature signal is not greater than the preset temperature change rate threshold and the temperature signal does not exceed the preset temperature protection threshold, it may be determined that the temperature of the mechanical device during operation is normal, and once the temperature signal exceeds the temperature protection threshold, it may be determined that the temperature of the mechanical device during operation is too high, and shutdown protection needs to be performed on the mechanical device.
In addition, because some abnormal conditions that cannot be automatically judged by a control system often occur in the operation process of mechanical equipment, and manual intervention is required, the method can further comprise the following steps: acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user; starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction; or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
That is to say, when the user finds that the equipment operates normally but the temperature signal is abnormal, the user can manually interrupt the temperature protection of the equipment and troubleshoot the unexpected situation, and at this time, the production equipment can continue to operate without the temperature protection, so that the production is not affected. After the incident is eliminated, the user can restart the temperature protection again.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the technical scheme of the embodiment of the application, after the temperature transmitter acquires the temperature signal data of the mechanical equipment, before judging whether the temperature signal data exceeds the set temperature protection threshold value, firstly judging whether the temperature signal data is positioned in the acceptable normal temperature range of the control equipment, thereby judging whether the abnormal conditions such as disconnection or disconnection occur in the transmission process of the temperature signal data, then by judging whether the temperature change rate of the temperature signal data in unit time is within the normal temperature change rate range, so that it can be judged whether the temperature of the mechanical equipment has sudden change or not, that is, during temperature protection, by adding various judgment information, abnormal conditions such as disconnection or disconnection of a data transmission line and temperature mutation can be fully considered, and equipment halt caused by the abnormal conditions can be further reduced to a certain extent.
In order to better explain the technical scheme of the present application, a detailed description will be given below of a specific implementation of the above scheme by using a specific example.
Example two
Referring to fig. 2 and fig. 3, fig. 2 is a schematic view of an idea of a temperature protection method for a mechanical device according to a second embodiment of the present disclosure, and fig. 3 is a schematic view of an analog processing procedure of the temperature protection method for a mechanical device according to the second embodiment of the present disclosure.
As shown in fig. 2, the user needs to first set a temperature change rate threshold for the control system, and after the mechanical device is powered on, after the temperature signal of the field host equipment is transmitted to a DCS (Distributed Control System) Control cabinet through a transmitter and a cable, an AI Input module in the DCS acquires a corresponding temperature signal, then whether the temperature signal has abnormal conditions such as disconnection or the like is judged according to an Analog value table built in the AI Input module (for example, a PLC Analog module of Siemens S7-300), if not, judging whether the temperature signal has sudden change or not based on a preset temperature change rate threshold value, when the temperature does not change suddenly, whether a protection signal is generated or not is judged based on a preset temperature protection threshold value, when the temperature suddenly changes, the time delay is triggered, and the temperature protection is not carried out temporarily in the time delay period and an alarm is given to prompt maintenance personnel to process.
As shown IN fig. 3, a user needs to set parameters such as "delay time", "disconnection determination condition", "temperature protection threshold", and "temperature change rate threshold" IN advance for a control system, and after the device is started, a determination process of whether a temperature has a sudden change is determined by calculating an absolute value of a temperature change rate, wherein a temperature signal input from a "PV" end is delayed by a "DEADT _ P" and then output from a "Q" end to a "SUB _ R" and an "ABS _ R", the SUB _ R is a mathematical operation function block representing a real subtraction, the ABS _ R is a mathematical operation function block representing an absolute value, an absolute value of a temperature change calculated by the "SUB _ R" and "ABS _ R" function block is output to a "DIV _ R", the DIV _ R is a mathematical operation function block representing a real division, and the temperature change rate du/dt is calculated according to the absolute value of the temperature change input from an IN1 end and the delay time input from an IN2 end, the IN1 end is a dividend, the IN2 end is a divisor, the calculated temperature change rate du/dt is compared with a preset temperature change rate threshold value by the CMP _ R, the CMP _ R is a mathematical operation function block with a large real number, if the temperature change rate du/dt is larger than the preset temperature change rate threshold value, the switching value is output to be 0, an alarm module alarms to prompt a user to perform exception handling, AND if the temperature change rate du/dt is smaller than or equal to the preset temperature change rate threshold value, the switching value is output to be 1.
Judging whether disconnection or disconnection occurs in the temperature signal transmission process or not according to whether the temperature signal meets a preset disconnection judgment condition or not, wherein the temperature signal is input into ' SUB _ R ' to be subtracted from a parameter value in the disconnection judgment condition, judgment is carried out according to the subtraction result, if the judgment result is disconnection, the ' SUB _ R ' outputs ' 0 ', so that an alarm module alarms to prompt a user to carry out exception handling, AND if the judgment result is no disconnection, the ' SUB _ R ' outputs ' 1 ' to an ' AND gate.
AND judging whether shutdown is needed due to abnormal temperature or not by judging whether the temperature signal exceeds a preset temperature protection threshold or not, wherein the temperature signal is input into the CMP _ R so as to be compared with the preset temperature protection threshold, AND when the temperature signal is greater than the preset temperature protection threshold, outputting '1' to the AND gate.
When all the inputs of the AND gate are 1, the output is 1, AND at the moment, a temperature protection signal is generated, namely, the equipment is stopped due to abnormal temperature.
It should be noted that the temperature signals in the field are processed according to the analog quantity after being connected to the PLC module.
In order to more fully introduce the technical solution of the present application, in correspondence to the temperature protection method for mechanical equipment provided in the foregoing embodiment of the present application, an embodiment of the present application further provides a temperature protection device for mechanical equipment.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a temperature protection device of a mechanical apparatus according to an embodiment of the present disclosure. As shown in fig. 4, the apparatus includes the following structure:
the first obtaining module 41 is configured to obtain a temperature signal sent by a temperature transmitter, and determine whether the temperature signal is within a preset temperature threshold range;
a calculating module 42, configured to calculate an absolute value of a temperature change rate based on the temperature signal and a temperature signal at a previous time if the temperature signal is within the temperature threshold range;
a first determining module 43, configured to determine whether an absolute value of the temperature change rate is greater than a preset temperature change rate threshold;
a second determining module 44, configured to determine whether the temperature signal exceeds a preset temperature protection threshold if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold;
and the sending module 45 is configured to send a shutdown instruction to the mechanical device if the temperature signal exceeds the temperature protection threshold.
Optionally, the apparatus further comprises:
the temporary stopping module is used for starting timing if the absolute value of the temperature change rate is greater than the temperature change rate threshold value, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold value;
and the restarting module is used for restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches the preset delay time.
Optionally, the apparatus further comprises:
the second acquisition module is used for acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user;
the processing module is used for starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction; or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
Specifically, the specific implementation manner of the function of each module may be implemented by referring to the content in the temperature protection method of the mechanical device, and will not be described in detail herein.
In order to more fully introduce the technical solution of the present application, in correspondence to the temperature protection method for mechanical equipment provided in the foregoing embodiment of the present application, an embodiment of the present application further provides a temperature protection system for mechanical equipment.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a temperature protection system of a mechanical device according to an embodiment of the present disclosure. As shown in fig. 5, the system includes: control device 53, temperature sensor 51 and temperature transmitter 52;
a control device 53 including a memory 531 and a processor 532 coupled to the memory 531; the memory 532 is used for storing a program for at least performing the temperature protection method of the mechanical apparatus described above; a processor 532 for calling and executing the program stored in the memory 531;
a temperature sensor 51 for acquiring temperature information of the mechanical device;
and a temperature transmitter 52 for converting the temperature information obtained by the temperature sensor 51 into a temperature signal recognizable by the control device 53.
Optionally, the system may further include: time-delay relay
The time delay relay is used for storing time delay set by a user, and starting timing when the temperature signal is determined to be in the temperature threshold range until the timing time reaches the time delay, and sending a trigger signal to the control equipment so that the control equipment starts to judge whether the temperature signal exceeds a preset temperature protection threshold value again;
the program stored in the memory 531 of the control device 53 is also used to execute the temperature protection method of the mechanical device including the delay processing step.
Specifically, please refer to the relevant contents in the temperature protection method for the mechanical device to realize the function of the program, which is not described in detail herein.
In addition, the control equipment is usually a PLC controller, so that in practical application, the program can be generated into a function block for the PLC controller to call, thereby facilitating the use of other equipment and providing high efficiency for programming of the whole production project.
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. A method of temperature protection of a mechanical device, comprising:
acquiring a temperature signal sent by a temperature transmitter, and judging whether the temperature signal is within a preset temperature threshold range;
if the temperature signal is within the temperature threshold range, calculating an absolute value of a temperature change rate based on the temperature signal and the temperature signal at the previous moment;
judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not;
if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold, judging whether the temperature signal exceeds a preset temperature protection threshold;
and if the temperature signal exceeds the temperature protection threshold value, sending a shutdown instruction to mechanical equipment.
2. The method of claim 1, further comprising:
if the absolute value of the temperature change rate is larger than the temperature change rate threshold, starting timing, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold;
and restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches a preset delay time.
3. The method of claim 1, further comprising:
and if the temperature signal exceeds the temperature threshold range, sending a first alarm signal.
4. The method of claim 1, further comprising:
and if the absolute value of the temperature change rate is greater than the temperature change rate threshold value, sending a second alarm signal.
5. The method of claim 1, further comprising:
acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user;
starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction;
or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
6. A temperature protection device for mechanical equipment, comprising:
the temperature acquisition module is used for acquiring a temperature signal sent by the temperature transmitter and judging whether the temperature signal is within a preset temperature threshold range;
the calculation module is used for calculating the absolute value of the temperature change rate based on the temperature signal and the temperature signal at the previous moment if the temperature signal is within the temperature threshold range;
the first judgment module is used for judging whether the absolute value of the temperature change rate is larger than a preset temperature change rate threshold value or not;
the second judgment module is used for judging whether the temperature signal exceeds a preset temperature protection threshold value or not if the absolute value of the temperature change rate is smaller than or equal to the temperature change rate threshold value;
and the sending module is used for sending a shutdown instruction to mechanical equipment if the temperature signal exceeds the temperature protection threshold value.
7. The apparatus of claim 6, further comprising:
the temporary stopping module is used for starting timing if the absolute value of the temperature change rate is greater than the temperature change rate threshold value, and temporarily stopping judging whether the temperature signal exceeds a preset temperature protection threshold value;
and the restarting module is used for restarting to judge whether the temperature signal exceeds a preset temperature protection threshold value or not until the timed time reaches the preset delay time.
8. The apparatus of claim 6, further comprising:
the second acquisition module is used for acquiring a starting temperature protection instruction or a stopping temperature protection instruction input by a user;
the processing module is used for starting to acquire a temperature signal sent by the temperature transmitter according to the temperature protection starting instruction; or stopping acquiring the temperature signal sent by the temperature transmitter according to the temperature protection stopping instruction.
9. A temperature protection system for a mechanical device, comprising: the device comprises a control device, a temperature sensor and a temperature transmitter;
the control device comprises a memory and a processor connected with the memory; the memory is used for storing a program for at least performing a method of temperature protection of a mechanical device according to claim 1; the processor is used for calling and executing the program stored in the memory;
the temperature sensor is used for acquiring temperature information of mechanical equipment;
and the temperature transmitter is used for converting the temperature information acquired by the temperature sensor into a temperature signal which can be identified by the control equipment.
10. The system of claim 9, further comprising: a time delay relay;
the time delay relay is used for storing time delay set by a user, and starting timing when the temperature signal is determined to be in the temperature threshold range until the timing time reaches the time delay, and sending a trigger signal to the control equipment so that the control equipment starts to judge whether the temperature signal exceeds a preset temperature protection threshold value again;
the program stored in the memory in the control device is also used to execute the method for temperature protection of a mechanical device according to claim 2.
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Application publication date: 20191224 |