阅读说明：本技术 机械设备的温度保护方法、装置和系统 (Temperature protection method, device and system for mechanical equipment ) 是由 翁松 于 2019-09-23 设计创作，主要内容包括：本申请涉及一种机械设备的温度保护方法、装置和系统。所述方法包括：获取温度变送器发送的温度信号,判断温度信号是否位于预设的温度阈值范围；若温度信号位于温度阈值范围,基于当前时刻的温度信号与前一时刻的温度信号计算温度变化率的绝对值；判断温度变化率的绝对值是否大于预设的温度变化率阈值；若温度变化率的绝对值小于或等于温度变化率阈值,判断温度信号是否超过预设的温度保护阈值；若温度信号超过温度保护阈值,向机械设备发送停机指令。本申请实施例提供的技术方案,通过增加多种判断信息,能够充分考虑温度信号的数据传输线路掉线或断线以及温度突变等异常情况,进而能够在一定程度上减少因异常情况引起的设备停机。(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.)

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.

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.

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.