CN114545856B - Mechanical self-resetting air pressure detection control device and control method - Google Patents
Mechanical self-resetting air pressure detection control device and control method Download PDFInfo
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- CN114545856B CN114545856B CN202210146304.3A CN202210146304A CN114545856B CN 114545856 B CN114545856 B CN 114545856B CN 202210146304 A CN202210146304 A CN 202210146304A CN 114545856 B CN114545856 B CN 114545856B
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- 238000000034 method Methods 0.000 title claims abstract description 19
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- 230000001105 regulatory effect Effects 0.000 claims description 38
- 230000008602 contraction Effects 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000004308 accommodation Effects 0.000 claims description 3
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- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000009792 diffusion process Methods 0.000 abstract description 5
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/14—Plc safety
- G05B2219/14036—Detection of fault in processor
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Abstract
The invention discloses a mechanical self-resetting air pressure detection control device and a control method, which relate to the technical field of air pressure transmission and have the technical scheme that: the system also comprises a processor and a PLC controller; the side wall of the air pressure main pipe is communicated with an adjusting cylinder, an adjusting plug is movably connected in the adjusting cylinder in a sealing mode, and the adjusting cylinder is provided with a driving piece for driving the adjusting plug to move along the axis direction of the adjusting cylinder; an air pressure sensor is arranged in the air pressure main pipe and/or the adjusting cylinder; the output end of the air pressure sensor is connected with the input end of the processor, the output end of the processor is connected with the input end of the PLC, and the output end of the PLC is connected with the input end of the driving piece; the processor is electrically connected with the air source device. The invention keeps the air pressure in the air pressure main pipe in a relatively stable state in a compressed air or diffusion air mode, does not need to frequently adjust the air source device, effectively ensures the stability of the whole system, and reduces the frequency of air pressure detection.
Description
Technical Field
The invention relates to the technical field of pneumatic transmission, in particular to a mechanical self-resetting pneumatic detection control device and a control method.
Background
Pneumatic transmission uses compressed gas as working medium, and utilizes the pressure of gas to transfer power or information. The system for transmitting power is characterized in that compressed gas is transmitted to a pneumatic executing element through a pipeline and a control valve, and the pressure energy of the compressed gas is converted into mechanical energy to do work; the system for transmitting information uses pneumatic logic element or jet element to realize logic operation, which is also called pneumatic control system.
With the high-precision manufacturing and the high-speed development of the power electronics industry, higher precision requirements are being put on control systems suitable for pneumatic transmission. The air pressure transmission has partial air pressure loss in the use process, and the air pressure transmission is unlikely to have absolute sealing, especially the sealing performance of the sealing structure is reduced to a certain extent along with long-time use, so that the air pressure transmission precision is gradually reduced, the air pressure of the air pressure transmission control system is required to be detected frequently, and the problems of high detection frequency, time and labor waste and the like exist. Therefore, in the prior art, it is considered to compensate the air pressure loss in the air pressure transmission process by detecting the air pressure in the air pressure main pipe in real time and performing feedback control on the working state of the air source device according to the detection result.
However, the air pressure loss in the air pressure transmission process is continuously generated in real time, and the working state of the air source device is feedback controlled according to the detection result, so that the adjusting frequency of the air source device is too high, the service life of the air source device is seriously reduced, and the stability of the whole system is also influenced. Therefore, how to study and design a mechanical self-resetting air pressure detection control device and a control method capable of overcoming the defects are the problems which need to be solved at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a mechanical self-resetting air pressure detection control device and a control method, which can adaptively adjust the capacity and the volume in an air pressure main pipe according to the detection result by using a mechanical piston structure, keep the air pressure in the air pressure main pipe in a relatively stable state in a compressed air or diffusion air mode, and effectively ensure the stability of the whole system without frequent adjustment of an air source device in the whole operation process, and reduce the frequency of air pressure detection.
The technical aim of the invention is realized by the following technical scheme:
in a first aspect, a mechanical self-resetting air pressure detection control device is provided, which comprises an air pressure main pipe and an air source device, and further comprises a processor and a PLC controller;
the side wall of the air pressure main pipe is communicated with an adjusting cylinder, an adjusting plug is movably connected in the adjusting cylinder in a sealing mode, and the adjusting cylinder is provided with a driving piece for driving the adjusting plug to move along the axis direction of the adjusting cylinder;
an air pressure sensor is arranged in the air pressure main pipe and/or the adjusting cylinder;
the output end of the air pressure sensor is connected with the input end of the processor, the output end of the processor is connected with the input end of the PLC, and the output end of the PLC is connected with the input end of the driving piece;
the processor is electrically connected with the air source device.
Further, the driving piece is a driving air cylinder, and an output shaft of the driving air cylinder is fixedly connected with the end part of the adjusting plug.
Further, the driving piece is a driving motor;
the output shaft of the driving motor is connected with a connector, at least one limiting protrusion is arranged around the connector, and the limiting protrusion is distributed along the axis direction of the output shaft of the driving motor;
the end part of the adjusting plug is provided with a sliding cavity for placing the connector, the sliding cavity is arranged along the axial direction of the adjusting plug, the axial length of the sliding cavity is greater than that of the connector, and the inner wall of the sliding cavity is provided with a limiting groove for the limiting protrusion to slide;
the outer wall of the adjusting plug is provided with a spiral bulge, and the inner wall of the adjusting cylinder is provided with a spiral groove which is in spiral fit with the spiral bulge.
Further, a stop valve positioned between the adjusting plug and the air pressure main pipe is arranged in the adjusting cylinder and is connected with the PLC;
the PLC controller is provided with an on-off switch, and the PLC controller responds to an on-off signal triggered by the on-off switch to control the stop valve to be opened and closed.
In a second aspect, there is provided a mechanical self-resetting air pressure detection control method for the mechanical self-resetting air pressure detection control device as described in any one of the first aspects, comprising the steps of:
acquiring air pressure data of an air pressure main pipe in a standard time period by an air pressure sensor, and establishing an air pressure real-time curve;
obtaining an air pressure change curve according to the difference between the air pressure real-time curve and a standard pressure value determined by the working state of an air source device;
dividing the standard time period into time units which are continuously distributed, and analyzing the air pressure variation of each time unit according to an air pressure variation curve;
the air pressure variable quantity is converted into the expansion quantity of the adjusting plug, and the adjusting plug is controlled to move along the axis direction of the adjusting cylinder according to the expansion quantity, so that the real-time air pressure in the air pressure main pipe is regulated and controlled to a standard pressure value.
Further, the calculation formula for converting the air pressure variation into the expansion and contraction amount of the adjusting plug specifically includes:
wherein, l represents the expansion and contraction amount of the regulating plug along the axial direction, if the expansion and contraction amount is negative, the regulating plug moves towards the air pressure main pipe to compress the air, and if the expansion and contraction amount is positive, the regulating plug moves away from the air pressure main pipe to diffuse the air; Δp represents the air pressure variation of the time unit, and is calculated by the difference between the air pressure value at the end time of the time unit and the starting time; v (V) 0 Representing the accommodation volume of the air pressure main pipe and the adjusting cylinder before the corresponding time unit is adjusted and controlled; p (P) 1 Representing a standard pressure value; s represents the inner cross-sectional area of the regulating cylinder in cm 2 。
Further, the control method further includes comparing, by the processor, the air pressure variation of the current time unit with a reference amount of a preset value:
if the air pressure variation is larger than or equal to the reference quantity, directly converting the air pressure variation into the expansion quantity;
if the air pressure variation is smaller than the reference quantity, adding the air pressure variation of the current time unit and the air pressure variation of the next time unit to be used as the air pressure variation of the next time unit participating in regulation and control until the overlapped air pressure variation is larger than or equal to the reference quantity, and converting the overlapped air pressure variation into the telescopic quantity.
Further, the control method further includes:
counting the total expansion and contraction amount of the regulating plug by the processor, and transmitting feedback signals to the air source device and the PLC controller by the processor when the total expansion and contraction amount exceeds the regulating limit of the regulating plug and the regulating cylinder;
the PLC controller responds to the feedback signal and then controls the reset of the regulating plug;
and after the air source device responds to the feedback signal, the real-time air pressure in the air pressure main pipe is regulated to reach the standard pressure value after the reset of the regulating plug is completed.
Further, the control method further comprises;
counting the regulation frequency of the regulating plug in a first preset period through a processor;
if the regulation frequency is greater than or equal to the upper limit frequency, the processor outputs a detection maintenance signal.
Further, the control method further comprises;
counting the regulation frequency of the regulating plug in a second preset period through a processor;
and if the regulation frequency is smaller than the lower limit frequency, the processor outputs a regulation fault signal.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the mechanical self-resetting air pressure detection control device provided by the invention, the capacity and the volume in the air pressure main pipe can be adaptively adjusted according to the detection result by using the mechanical piston structure, the air pressure in the air pressure main pipe is kept in a relatively stable state in a compressed gas or diffusion gas mode, the air source device is not required to be frequently adjusted in the whole operation process, the stability of the whole system is effectively ensured, and meanwhile, the frequency of air pressure detection is reduced;
2. according to the invention, the limit protrusion is matched with the limit groove, so that the relative circumferential rotation between the connector and the adjusting plug is limited, and the adjusting plug can stretch along the axial direction of the adjusting cylinder under the matching of the spiral protrusion and the spiral groove; in addition, the spiral bulge is matched with the spiral groove, so that the condition that the adjusting plug automatically moves under the atmospheric pressure in the air pressure main pipe can be effectively prevented, and the sealing performance between the adjusting plug and the adjusting cylinder can be effectively enhanced;
3. according to the invention, the processor is used for comparing and analyzing the air pressure variation of the current time unit with the reference quantity of the preset value, so that the regulation frequency of the regulating plug can be effectively reduced;
4. the invention can also carry out feedback control on the working state of the air source device according to the regulation and control condition of the regulating plug, and simultaneously carry out reset control on the regulating plug, thereby effectively ensuring that the air pressure detection regulation and control device can be recycled;
5. the invention also analyzes the regulation frequency of the regulating plug, can realize automatic detection, maintenance and early warning under the condition of larger regulation frequency, and can realize automatic detection and early warning of failure faults of the regulating device under the condition of lower or zero regulation frequency.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure in an embodiment of the present invention;
fig. 2 is a schematic diagram of the operation of an embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
101. a pneumatic main pipe; 102. a stop valve; 103. an adjustment cylinder; 104. a driving member; 105. an adjusting plug; 106. a spiral groove; 107. spiral bulges; 108. a connector; 109. a limit protrusion; 110. a limit groove; 201. an air pressure sensor; 202. a processor; 203. a PLC controller; 204. and an air source device.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Examples: as shown in fig. 1 and 2, the mechanical self-resetting air pressure detection control device comprises an air pressure main pipe 101 and an air source device 204, and further comprises a processor 202 and a PLC controller 203. The side wall of the air pressure main pipe 101 is communicated with an adjusting cylinder 103, an adjusting plug 105 is movably connected in a sealing mode inside the adjusting cylinder 103, and the adjusting cylinder 103 is provided with a driving piece 104 for driving the adjusting plug 105 to move along the axial direction of the adjusting cylinder 103. The air pressure sensor 201 is installed inside the adjustment cylinder 103. An output end of the air pressure sensor 201 is connected with an input end of the processor 202, an output end of the processor 202 is connected with an input end of the PLC controller 203, and an output end of the PLC controller 203 is connected with an input end of the driving piece 104. The processor 202 is electrically connected to the air source device 204.
According to the invention, the capacity and the volume of the inside of the air pressure main pipe 101 can be adaptively adjusted according to the detection result by using the mechanical piston structure, the air pressure in the air pressure main pipe 101 is kept in a relatively stable state in a compressed gas or diffusion gas mode, the air source device 204 is not required to be frequently adjusted in the whole operation process, the stability of the whole system is effectively ensured, and the frequency of air pressure detection is reduced.
It should be noted that, the air pressure sensor 201 may be one installed in the air pressure main pipe 101 or the adjusting cylinder 103, or two air pressure sensors may be installed in the air pressure main pipe 101 and the adjusting cylinder 103, respectively, and the average value of the two air pressure sensors 201 is used as a detection value, so as to reduce the error caused by the airflow.
In this embodiment, the driving member 104 is a driving motor, so that the driving motor can realize the regulation and control in different directions by forward and reverse rotation; the output shaft of the driving motor is connected with a connector 108, a plurality of limiting protrusions 109 are arranged around the connector 108, and the limiting protrusions 109 are distributed along the axis direction of the output shaft of the driving motor; the end part of the adjusting plug 105 is provided with a sliding cavity for placing the connector 108, the sliding cavity is arranged along the axial direction of the adjusting plug 105, the axial length of the sliding cavity is larger than that of the connector 108, and the inner wall of the sliding cavity is provided with a limiting groove 110 for the limiting protrusion 109 to slide; the outer wall of the adjusting plug 105 is provided with a screw protrusion 107, and the inner wall of the adjusting cylinder 103 is provided with a screw groove 106 screw-fitted with the screw protrusion 107. The invention limits the relative circumferential rotation between the connector 108 and the adjusting plug 105 by the cooperation of the limit protrusion 109 and the limit groove 110, and the adjusting plug 105 can stretch along the axial direction of the adjusting cylinder 103 by the cooperation of the spiral protrusion 107 and the spiral groove 106; in addition, the spiral protrusion 107 is matched with the spiral groove 106, so that the condition that the adjusting plug 105 automatically moves under the atmospheric pressure in the air pressure main pipe 101 can be effectively prevented, and the sealing performance between the adjusting plug 105 and the adjusting cylinder 103 can be effectively enhanced.
As another alternative embodiment, the driving member 104 is a driving cylinder, and an output shaft of the driving cylinder is fixedly connected to an end of the adjusting plug 105. The driving manner between the driving member 104 and the adjustment plug 105 may be replaced with another driving manner capable of achieving axial driving, and is not limited herein.
In the embodiment, a stop valve 102 is arranged inside the adjusting cylinder 103 and positioned between the adjusting plug 105 and the air pressure main pipe 101, and the stop valve 102 is connected with a PLC 203; the PLC controller 203 is provided with an on-off switch, and the PLC controller 203 responds to an on-off signal triggered by the on-off switch to control the stop valve 102 to be opened or closed. When the internal devices of the adjusting cylinder 103 need to be overhauled, the sealing and the separation of the adjusting cylinder 103 can be completed by operating the on-off switch.
As shown in fig. 2, the control method of the mechanical self-resetting air pressure detection control device comprises the following steps:
s1: acquiring air pressure data of the air pressure main pipe 101 in a standard time period by an air pressure sensor 201, and establishing an air pressure real-time curve;
s2: obtaining an air pressure change curve according to the difference between the air pressure real-time curve and a standard pressure value determined by the working state of the air source device 204;
s3: dividing the standard time period into time units which are continuously distributed, and analyzing the air pressure variation of each time unit according to an air pressure variation curve;
s4: the air pressure change amount is converted into the expansion and contraction amount of the adjusting plug 105, and the adjusting plug 105 is controlled to move along the axial direction of the adjusting cylinder 103 according to the expansion and contraction amount, so that the real-time air pressure in the air pressure main pipe 101 is regulated and controlled to a standard pressure value.
It should be noted that, the processor 202 may be replaced by another host computer, an intelligent terminal, a server, etc. with an operation processing capability, so as to implement remote transmission of data by using a communication module.
In the present embodiment, the calculation formula for converting the air pressure variation amount into the expansion and contraction amount of the adjustment plug 105 is specifically:
where l represents the expansion and contraction amount of the adjustment plug 105 in the axial direction, and if negative, the adjustment plug moves toward the gas pressure main pipe 101 to compress the gas, and if positive, the adjustment plug moves away from the gas pressure main pipe 101 to diffuse the gas; Δp represents the air pressure variation of the time unit, and is calculated by the difference between the air pressure value at the end time of the time unit and the starting time; v (V) 0 Representing the volume of accommodation of the pneumatic main tube 101 and the regulating cylinder 103 before regulation of the corresponding time units; p (P) 1 Representing a standard pressure value; s represents the inner cross-sectional area of the adjustment cylinder 103Units of cm 2 。
It should be noted that the above formula may be changed without considering the volume change of the adjusting cylinder 103 itself, or may be changed with further consideration of the influence of the spiral groove 106 on the volume, and the above method may be adjusted according to the requirement.
In addition, the present invention also compares the air pressure variation of the current time unit with a reference value of a preset value through the processor 202: if the air pressure variation is larger than or equal to the reference quantity, directly converting the air pressure variation into the expansion quantity; if the air pressure variation is smaller than the reference amount, the air pressure variation of the current time unit and the air pressure variation of the next time unit are added to be used as the air pressure variation of the next time unit participating in regulation and control until the overlapped air pressure variation is larger than or equal to the reference amount, and the overlapped air pressure variation is converted into the telescopic amount, so that the regulation and control frequency of the regulating plug 105 can be effectively reduced.
In addition, the total expansion and contraction amount of the regulating plug 105 is counted by the processor 202, and when the total expansion and contraction amount exceeds the regulating limit of the regulating plug 105 and the regulating cylinder 103, the processor 202 simultaneously transmits feedback signals to the air source device 204 and the PLC 203; the PLC 203 responds to the feedback signal to control the reset of the regulating plug 105; the air source device 204 responds to the feedback signal, and adjusts the real-time air pressure in the air pressure main pipe 101 until the air pressure reaches the standard pressure value after the reset of the adjusting plug 105 is completed, thereby effectively ensuring that the air pressure detection adjusting device can be recycled,
the invention also counts the regulation frequency of the regulating plug 105 in a first preset period through the processor 202; if the regulation frequency is greater than or equal to the upper limit frequency, the processor 202 outputs a detection maintenance signal, which can realize automatic detection maintenance early warning under the condition of larger regulation frequency,
finally, the invention also counts the regulation frequency of the regulating plug 105 in a second preset period through the processor 202; if the regulation frequency is smaller than the lower limit frequency, the processor 202 outputs a regulation fault signal, so that the automatic detection and early warning of the failure fault of the adjusting device can be realized under the condition that the regulation frequency is lower or zero.
It should be noted that the first preset period and the second preset period may be the same or different, and the size distribution therebetween is not limited herein.
Working principle: according to the invention, the capacity and the volume of the inside of the air pressure main pipe 101 can be adaptively adjusted according to the detection result by using the mechanical piston structure, the air pressure in the air pressure main pipe 101 is kept in a relatively stable state in a compressed gas or diffusion gas mode, the air source device 204 is not required to be frequently adjusted in the whole operation process, the stability of the whole system is effectively ensured, and the frequency of air pressure detection is reduced.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The mechanical self-resetting air pressure detection control device comprises an air pressure main pipe (101) and an air source device (204), and is characterized by further comprising a processor (202) and a PLC (programmable logic controller) 203;
the side wall of the air pressure main pipe (101) is communicated with an adjusting cylinder (103), an adjusting plug (105) is movably connected in the adjusting cylinder (103) in a sealing mode, and the adjusting cylinder (103) is provided with a driving piece (104) for driving the adjusting plug (105) to move along the axial direction of the adjusting cylinder (103);
an air pressure sensor (201) is arranged in the air pressure main pipe (101) and/or the adjusting cylinder (103);
the output end of the air pressure sensor (201) is connected with the input end of the processor (202), the output end of the processor (202) is connected with the input end of the PLC (203), and the output end of the PLC (203) is connected with the input end of the driving piece (104);
the processor (202) is electrically connected with the air source device (204);
the driving piece (104) is a driving motor;
the output shaft of the driving motor is connected with a connector (108), at least one limiting protrusion (109) is arranged around the connector (108), and the limiting protrusion (109) is distributed along the axis direction of the output shaft of the driving motor;
the end part of the adjusting plug (105) is provided with a sliding cavity for placing the connector (108), the sliding cavity is arranged along the axial direction of the adjusting plug (105), the axial length of the sliding cavity is greater than that of the connector (108), and the inner wall of the sliding cavity is provided with a limiting groove (110) for sliding of the limiting protrusion (109);
the outer wall of the adjusting plug (105) is provided with a spiral bulge (107), and the inner wall of the adjusting cylinder (103) is provided with a spiral groove (106) in spiral fit with the spiral bulge (107);
the control method of the device comprises the following steps:
acquiring air pressure data of an air pressure main pipe (101) in a standard time period through an air pressure sensor (201), and establishing an air pressure real-time curve;
obtaining an air pressure change curve according to the difference between the air pressure real-time curve and a standard pressure value determined by the working state of the air source device (204);
dividing the standard time period into time units which are continuously distributed, and analyzing the air pressure variation of each time unit according to an air pressure variation curve;
the air pressure change quantity is converted into the expansion quantity of the adjusting plug (105), and the adjusting plug (105) is controlled to move along the axial direction of the adjusting cylinder (103) according to the expansion quantity, so that the real-time air pressure in the air pressure main pipe (101) is regulated and controlled to a standard pressure value.
2. The mechanical self-resetting air pressure detection control device according to claim 1, wherein a stop valve (102) positioned between an adjusting plug (105) and an air pressure main pipe (101) is arranged in the adjusting cylinder (103), and the stop valve (102) is connected with a PLC (203);
the PLC (203) is provided with an on-off switch, and the PLC (203) responds to an on-off signal triggered by the on-off switch to control the stop valve (102) to be opened or closed.
3. The mechanical self-resetting air pressure detection control device according to claim 1, wherein the calculation formula for converting the air pressure variation into the expansion and contraction amount of the adjusting plug (105) is specifically as follows:
wherein l represents the expansion and contraction amount of the adjusting plug (105) along the axial direction, and if the expansion and contraction amount is negative, the adjusting plug moves towards the air pressure main pipe (101) to compress the air, and if the expansion and contraction amount is positive, the adjusting plug moves away from the air pressure main pipe (101) to diffuse the air; Δp represents the air pressure variation of the time unit, and is calculated by the difference between the air pressure value at the end time of the time unit and the starting time; v (V) 0 Representing the accommodation volume of the air pressure main pipe (101) and the adjusting cylinder (103) before the adjustment of the corresponding time units; p (P) 1 Representing a standard pressure value; s represents the inner cross-sectional area of the regulating cylinder (103), in cm 2 。
4. The mechanical self-resetting air pressure detection and control device as recited in claim 1, further comprising comparing, by the processor (202), the air pressure variation of the current time unit with a reference value of a preset value:
if the air pressure variation is larger than or equal to the reference quantity, directly converting the air pressure variation into the expansion quantity;
if the air pressure variation is smaller than the reference quantity, adding the air pressure variation of the current time unit and the air pressure variation of the next time unit to be used as the air pressure variation of the next time unit participating in regulation and control until the overlapped air pressure variation is larger than or equal to the reference quantity, and converting the overlapped air pressure variation into the telescopic quantity.
5. The mechanical self-resetting air pressure detection and control device as recited in claim 1, further comprising:
counting the total expansion and contraction amount of the regulating plug (105) through the processor (202), and simultaneously transmitting a feedback signal to the air source device (204) and the PLC (203) by the processor (202) when the total expansion and contraction amount exceeds the regulating limit of the regulating plug (105) and the regulating cylinder (103);
the PLC (203) responds to the feedback signal and then controls the reset of the regulating plug (105);
and the air source device (204) responds to the feedback signal, and adjusts the real-time air pressure in the air pressure main pipe (101) until the air pressure reaches a standard pressure value after the reset of the adjusting plug (105) is completed.
6. The mechanical self-resetting barometric pressure sensing control device of claim 1, further comprising;
counting, by a processor (202), a regulation frequency of the regulating plug (105) within a first preset period;
if the regulation frequency is greater than or equal to the upper limit frequency, the processor (202) outputs a detection maintenance signal.
7. The mechanical self-resetting barometric pressure sensing control device of claim 1, further comprising;
counting, by the processor (202), a regulation frequency of the regulating plug (105) in a second preset period;
if the regulation frequency is less than the lower limit frequency, the processor (202) outputs a regulation fault signal.
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| CN202210146304.3A CN114545856B (en) | 2022-02-17 | 2022-02-17 | Mechanical self-resetting air pressure detection control device and control method |
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| CN202210146304.3A CN114545856B (en) | 2022-02-17 | 2022-02-17 | Mechanical self-resetting air pressure detection control device and control method |
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|---|---|---|---|---|
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