CN111059123A - Bolt structure capable of measuring pressure and intensity of pressure in real time - Google Patents
Bolt structure capable of measuring pressure and intensity of pressure in real time Download PDFInfo
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- CN111059123A CN111059123A CN201911105419.2A CN201911105419A CN111059123A CN 111059123 A CN111059123 A CN 111059123A CN 201911105419 A CN201911105419 A CN 201911105419A CN 111059123 A CN111059123 A CN 111059123A
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- 238000005259 measurement Methods 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
- G01L1/2293—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges of the semi-conductor type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Computer Networks & Wireless Communication (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a bolt structure capable of measuring pressure and pressure intensity in real time, which comprises a force measuring bolt, a pressure measuring module, a wireless transmission module, a singlechip module and a data display module, wherein the force measuring bolt is connected with the pressure measuring module; the force measuring bolt comprises a bolt head and a bolt rod part, wherein the bolt head and the bolt rod part are provided with a through wire through hole, and a plurality of patch grooves are axially arranged on the bolt rod part at intervals; the pressure measurement module comprises a head force measurement unit and a rod force measurement unit, the head force measurement unit comprises a gasket, a miniature force sensor array is arranged on the gasket, the rod force measurement unit comprises a plurality of strain gauges, and the strain gauges are arranged in the patch grooves. According to the invention, the head part of the bolt adopts the micro force sensor array, the rod part of the bolt adopts the patch groove and is internally provided with the strain gauge bridge, and the rest parts of the rod part of the bolt except the patch groove adopt the fastening threads, so that the two parts are effectively combined, and the functions of connection and force measurement are realized, thus the accuracy of force measurement can be ensured, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of electromechanical engineering, and particularly relates to a bolt structure capable of measuring pressure and intensity of pressure in real time.
Background
The bolt (or screw) group connection is one of the most common connection modes in the assembly of electromechanical products such as instruments and meters, and for pressure measurement after the electromechanical products are assembled and applied, the stress influence of the bolt head part can be easily ignored when a traditional resistance strain test method is adopted to attach a strain gauge to the bolt screw, or a special force measuring instrument is used for measuring force, so that the energy and material resources are increased.
Pressure measurement during instrument assembly is becoming more and more common in the digital era of networks today. At present, the pressure in bolt connection is not directly measured, and the pretightening force born by the bolt and the acting force between devices can reflect the assembly quality and reliability of the whole device, so that the pretightening force and the pressure of a connecting instrument born by the bolt are very necessary to be measured by the bolt. Particularly, the real-time monitoring of the pressure applied to a certain part in the application occasions of bridges, aviation, mechanical engineering and the like is related to the production efficiency, the service life of instruments and the normal operation of devices, and even is closely related to safety. For example, each iron lock, bridge column and railing of the bridge are connected by bolts, and if the stress value measured by a certain force measuring bolt exceeds the limit value, an alarm is given, so that safety accidents can be prevented.
Disclosure of Invention
The present invention is directed to a bolt structure capable of measuring pressure and pressure in real time, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a bolt structure capable of measuring pressure and pressure in real time comprises a force measuring bolt, a pressure measuring module, a wireless transmission module, a single chip microcomputer module and a data display module, wherein the pressure measuring module is arranged on the force measuring bolt and is electrically connected with the wireless transmission module, the wireless transmission module is electrically connected with the single chip microcomputer module, and the single chip microcomputer module is electrically connected with the data display module;
the force measuring bolt is a countersunk bolt and comprises a bolt head and a bolt rod part, wherein the bolt head and the bolt rod part are provided with a through wire through hole, a plurality of patch grooves are axially arranged on the bolt rod part at intervals, and the patch grooves are communicated with the wire through hole;
the pressure measurement module comprises a head force measurement unit and a rod force measurement unit, the head force measurement unit comprises a gasket, the gasket is arranged by being attached to the head of a bolt, the rod of the bolt penetrates through the gasket, a micro force sensor array is arranged on the gasket, the rod force measurement unit comprises a plurality of strain gauges, and the strain gauges are arranged in a patch groove;
the wireless transmission module comprises a wireless gateway and a wire, wherein the wire penetrates through the wire through hole and is connected with the wireless gateway, the micro force sensor array and the strain gauge.
Preferably, the micro force sensor array is formed by arranging a plurality of micro force sensors into three circles, and comprises twenty-eight micro force sensors which are four, eight and sixteen respectively from inside to outside.
Preferably, the miniature force sensor can be a piezoelectric type or a pneumatic type force sensor.
Preferably, the head force measuring unit further comprises a first protective washer and a second protective washer, and the first protective washer and the second protective washer are respectively arranged on two sides of the gasket.
Preferably, the strain gauge is made of semiconductor materials, the number of the patch grooves is five, each ring comprises eight grooves which are uniformly distributed, and the strain gauge is arranged in each groove.
Preferably, the single chip microcomputer module comprises a single chip microcomputer and an A/D converter;
the single chip microcomputer can carry out weighted average algorithm processing on the micro force sensor array to judge whether the stress is uniform or not, and if the stress is not uniform, the average value is worked out through the weighted algorithm to reduce errors;
the differential output signal generated by the strain gauge can be transmitted to an amplifier, and the amplified analog signal is converted into a digital signal through an A/D converter.
Preferably, the data display module comprises a liquid crystal display, a numerical value setting button and an alarm;
the liquid crystal display is used for displaying the pressure value and the pressure value output by the singlechip;
the numerical value setting button is used for setting a safety limit value which can be borne by a device where the force measuring bolt is located by a user according to an actual situation;
the alarm gives an alarm when the numerical value measured by the force measuring bolt is greater than the safety value set by a user.
Preferably, a method for measuring pressure and pressure in real time by using a bolt structure according to any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: three circles of micro force sensor arrays are distributed on the gasket, and the coefficient ratio from inside to outside is k1、k2、k3The numerical value of each circle of measurement is processed by the single chip microcomputer to obtain a weighted average value and multiplied by respective coefficients to obtain a final force measurement result;
step two: when the strain gauge attached in the patch groove is stressed, the bridge is unbalanced, a differential pressure signal is output, and a designed bridge circuit automatically compensates the temperature in the process;
step three: the lead transmits the signals measured by the micro force sensor array and the differential pressure signals generated by the strain gauge to the wireless node, and the signals are transmitted to the singlechip through the wireless gateway for receiving, processing and outputting;
step four: the operational amplifier amplifies the original signal received by the singlechip to an electric signal which can be identified by the data acquisition card;
step five: the A/D converter converts the amplified electric signals collected by the data acquisition card into digital signals;
step six: the single chip microcomputer outputs the pressure value and the pressure value calculated by the internal algorithm to a liquid crystal display, and compares a safety value set by a user with a force measuring bolt measured value in real time;
step seven: the output value of the single chip microcomputer is visually displayed, and the condition that the output value exceeds a set value is alarmed in real time, so that a user is reminded of stopping operation in time.
Has the advantages that:
(1) according to the bolt structure capable of measuring pressure and pressure intensity in real time, the pressure value is obtained through the micro force sensor array attached to the gasket, and the gasket is matched with the protection gasket up and down, so that the condition of inaccurate result caused by friction and vibration in the operation process can be avoided, and the pressure intensity can be conveniently measured in any occasion.
(2) According to the bolt structure capable of measuring pressure and intensity in real time, the head of the bolt adopts the micro force sensor array, the rod of the bolt adopts the patch groove and is internally provided with the strain gauge bridge, and the rest parts of the rod of the bolt except the patch groove adopt the fastening threads, so that the bolt structure and the strain gauge bridge are effectively combined, and have the functions of connection and force measurement, so that the accuracy of force measurement can be ensured, and the cost can be also ensured.
(3) According to the bolt structure capable of measuring pressure and intensity in real time, the wireless node is adopted to transmit the differential pressure signal, and the situation that the assembly is complex due to the connection of the conducting wires can be avoided.
(4) According to the bolt structure capable of measuring pressure and pressure in real time, the safety value is set through the button, when the pressure value measured in real time is larger than or equal to the safety value, the alarm immediately gives an alarm, and the equipment is stopped from continuously running through the single chip microcomputer and the wireless gateway, so that equipment can be protected and a security worker can be reminded.
(5) According to the bolt structure capable of measuring pressure and intensity in real time, the force measuring bolt and the gasket are all kits meeting production matching standards, so that the bolt structure not only meets the assembly requirements, but also can play a role in measuring force, other force measuring instruments are not required to be additionally arranged, and the using process is simplified.
Drawings
Fig. 1 is a block diagram illustrating an overall structure of a bolt structure capable of measuring pressure and intensity in real time according to the present invention.
Fig. 2 is an overall assembly view of a bolt structure capable of measuring pressure and pressure in real time according to the present invention.
Fig. 3 is a partial structural view of a bolt structure capable of measuring pressure and pressure in real time according to the present invention.
FIG. 4 is a design diagram of an array of micro force sensors on a spacer with a bolt structure capable of measuring pressure and intensity in real time according to the present invention.
Fig. 5 is a partial patch design diagram of a strain gauge on a bolt shank of a bolt structure capable of measuring pressure and pressure in real time according to the present invention.
FIG. 6 is a circuit diagram of a strain gauge bridge with a bolt structure capable of measuring pressure and pressure in real time according to the present invention.
FIG. 7 is a schematic diagram of the connection between a wireless node of a bolt structure and a single chip microcomputer, wherein the wireless node can measure pressure and intensity in real time.
Fig. 8 is a schematic diagram of a numerical display and an alarm of a bolt structure capable of measuring pressure and intensity in real time according to the present invention.
Fig. 9 is a control flow chart of a bolt structure capable of measuring pressure and pressure in real time according to the present invention.
In the figure: 1-a force-measuring bolt, 11-a bolt head, 12-a bolt shank, 13-a wire through hole, 14-a patch groove, 2-a pressure-measuring module, 21-a head force-measuring cell, 211-a gasket, 212-a micro-force sensor array, 213-a first protective washer, 214-a second protective washer, 22-a shank force-measuring cell, 221-a strain gage;
r1, R2, R3, and R4 form a wheatstone bridge, R5, R6, and NPN Q1 form a temperature compensation system, Vi is an external supply voltage, and Vo is a bridge output voltage.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1-9, a bolt structure capable of measuring pressure and pressure in real time, which has both connection and force measurement functions, includes a force measurement bolt 1, a pressure measurement module 2, a wireless transmission module, a single chip module and a data display module, wherein the pressure measurement module 2 is disposed on the force measurement bolt 1, the pressure measurement module 2 is electrically connected with the wireless transmission module, the wireless transmission module is electrically connected with the single chip module, and the single chip module is electrically connected with the data display module;
the force measuring bolt 1 is a countersunk bolt and comprises a bolt head 11 and a bolt rod part 12, the bolt head 11 and the bolt rod part 12 are provided with a through wire through hole 13, a plurality of patch grooves 14 are axially arranged on the bolt rod part 12 at intervals, and the patch grooves 14 are communicated with the wire through hole 13;
the pressure measurement module 2 comprises a head force measurement unit 21 and a rod force measurement unit 22, the head force measurement unit 21 comprises a gasket 211, the gasket 211 is arranged to be attached to the head 11 of the bolt, the rod 12 of the bolt penetrates through the gasket 211, a micro force sensor array 212 is arranged on the gasket 211, the rod force measurement unit 22 comprises a plurality of strain gauges 221, and the strain gauges 221 are arranged in a patch groove 14;
the wireless transmission module comprises a wireless gateway and a wire, the wire penetrates through the wire through hole 13, and the wire is connected with the wireless gateway, the micro force sensor array 212 and the strain gauge 221.
The micro force sensor array 212 is formed by arranging a plurality of micro force sensors into three circles, and comprises twenty-eight micro force sensors, namely four, eight and sixteen micro force sensors from inside to outside.
The miniature force sensor can be a piezoelectric type or a pneumatic type force sensor.
The head force measuring unit 21 further comprises a first protection washer 213 and a second protection washer 214, wherein the first protection washer 213 and the second protection washer 214 are respectively arranged on two sides of the pad 211 and are used for protecting the micro force sensor array 212 and the lead wire attached to the pad 211 and avoiding damage caused by external force.
The strain gauge 221 is made of semiconductor materials, the number of the patch grooves 14 is five, each circle of the patch grooves comprises eight grooves which are uniformly distributed, and the strain gauge 221 is arranged in each groove.
The single chip microcomputer module comprises a single chip microcomputer and an A/D converter;
the single chip microcomputer can carry out weighted average algorithm processing on the micro force sensor array 212 to judge whether the stress is uniform, and if the stress is not uniform, the average value is calculated through the weighted algorithm to reduce errors;
the differential output signal generated by the strain gauge 221 may be transmitted to an amplifier, and the amplified analog signal may be converted to a digital signal by an a/D converter.
The data display module comprises a liquid crystal display, a numerical value setting button and an alarm;
the liquid crystal display is used for displaying the pressure value and the pressure value output by the singlechip;
the numerical value setting button is used for setting a safety limit value which can be borne by a device where the force measuring bolt 1 is located by a user according to an actual situation;
the alarm gives an alarm when the numerical value measured by the force measuring bolt 1 is greater than the safety value set by a user.
A method for measuring pressure and pressure in real time by using a bolt structure according to any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: three circles of micro force sensor arrays 212 are distributed on the pad 211, and the coefficient ratios from inside to outside are respectively k1、k2、k3The value of each circle of measurement is processed by the single chip to obtain a weighted average value and multiplied by respective coefficient to obtain the maximum valueFinal force measurement results;
step two: when the strain gauge 221 attached in the patch groove 14 is stressed, the bridge is unbalanced, a differential pressure signal is output, and a designed bridge circuit automatically compensates temperature in the process;
step three: the signal measured by the micro force sensor array 212 and the differential pressure signal generated by the strain gauge 221 are transmitted to the wireless node through the wire, and are transmitted to the single chip microcomputer through the wireless gateway for receiving, processing and outputting;
step four: the operational amplifier amplifies the original signal received by the singlechip to an electric signal which can be identified by the data acquisition card;
step five: the A/D converter converts the amplified electric signals collected by the data acquisition card into digital signals;
step six: the single chip microcomputer outputs the pressure value and the pressure value calculated by the internal algorithm to a liquid crystal display, and compares a safety value set by a user with a measured value of the force measuring bolt 1 in real time;
step seven: the output value of the single chip microcomputer is visually displayed, and the condition that the output value exceeds a set value is alarmed in real time, so that a user is reminded of stopping operation in time.
The method mainly comprises the following four steps:
the first step is as follows: acquiring a pressure signal:
the pressure signal of the bolt device for measuring pressure and pressure comes from two parts: one part is the pressure measured by the micro force sensor array 212 attached to the gasket 211 matched with the bolt head 11; the other part is that the bolt rod part 12 is attached with a voltage difference generated by the resistance change of the strain gauge 221 in the groove 14. The bolt is used for assembling the instrument, and the gasket 211 and the bolt are matched to be capable of clamping the device and measuring the pressure in real time. The signals measured by the micro force sensor array 212 are directly transmitted to the single chip microcomputer through a wire, and are processed by an internal algorithm of the single chip microcomputer to carry out weighted average calculation; the strain gauge 221 attached in the patch groove 14 forms a bridge with a temperature compensation function, and when the external applies pressure to the part where the bolt is located, the strain gauge 221 causes the bridge to be unbalanced due to resistance change, so that a differential output signal is generated.
The second step is that: the wireless node transmits signals:
and the differential signals generated by the strain gauge 221 in the patch groove 14 of the bolt rod part 12 are transmitted to the singlechip through the wireless gateway.
The third step: amplifying and processing signals:
the analog signals transmitted to the wireless gateway by the wireless nodes are too weak to be directly converted into digital signals, and the digital signals need to be amplified by an amplifying circuit and then converted into the digital signals by an A/D converter. The single chip microcomputer firstly carries out weighted average processing on each circle of force measuring sensor, and then calculates the final total stress average value of the bolt head 11 according to each circle of coefficient; secondly, processing a differential pressure signal generated by the strain gauge 221 at the bolt rod part 12; and finally, the singlechip obtains a pressure value through an internal pressure conversion algorithm, and compares the set safety value with the measured value in real time.
The fourth step: displaying and alarming signals:
the single chip microcomputer transmits the processed digital signals and the calculation results to the liquid crystal display screen for displaying, and when the measured value is detected to be greater than the safety value, the single chip microcomputer immediately responds to interruption, cuts off the power supply and gives an alarm.
According to the bolt structure capable of measuring pressure and pressure intensity in real time, the pressure value is obtained through the micro force sensor array 212 attached to the gasket 211, and the gasket 211 is matched with the protective gaskets up and down, so that the condition that the result is inaccurate due to friction and vibration in the operation process can be avoided, and the pressure intensity can be conveniently measured in any occasion.
According to the bolt structure capable of measuring pressure and pressure in real time, the bolt head 11 adopts the micro force sensor array 212, the bolt rod 12 adopts the patch groove 14 to be internally provided with the strain gauge bridge, and the rest part of the bolt rod 12 except the patch groove 14 adopts the fastening threads, so that the two parts are effectively combined, the accuracy of force measurement can be ensured, and the cost can be also ensured.
According to the bolt structure capable of measuring pressure and intensity in real time, the wireless node is adopted to transmit the differential pressure signal, and the situation that the assembly is complex due to the connection of the conducting wires can be avoided.
According to the bolt structure capable of measuring pressure and pressure in real time, the safety value is set through the button, when the pressure value measured in real time is larger than or equal to the safety value, the alarm immediately gives an alarm, and the equipment is stopped from continuously running through the single chip microcomputer and the wireless gateway, so that equipment can be protected and a security worker can be reminded.
According to the bolt structure capable of measuring pressure and intensity in real time, the force measuring bolt 1 and the gasket 211 are all kits meeting production matching standards, so that the bolt structure not only meets the assembly requirements, but also can play a role in measuring force, other force measuring instruments are not required to be additionally arranged, and the using process is simplified.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the above-described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the invention, without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a can real-time measurement pressure and pressure's bolt structure which characterized in that:
the pressure measuring device comprises a force measuring bolt (1), a pressure measuring module (2), a wireless transmission module, a single chip microcomputer module and a data display module, wherein the pressure measuring module (2) is arranged on the force measuring bolt (1), the pressure measuring module (2) is electrically connected with the wireless transmission module, the wireless transmission module is electrically connected with the single chip microcomputer module, and the single chip microcomputer module is electrically connected with the data display module;
the force measuring bolt (1) is a countersunk bolt and comprises a bolt head (11) and a bolt rod part (12), the bolt head (11) and the bolt rod part (12) are provided with a through wire through hole (13), a plurality of patch grooves (14) are axially arranged on the bolt rod part (12) at intervals, and the patch grooves (14) are communicated with the wire through hole (13);
the pressure measurement module (2) comprises a head force measurement unit (21) and a rod force measurement unit (22), the head force measurement unit (21) comprises a gasket (211), the gasket (211) is arranged by being attached to the head part (11), the bolt rod part (12) penetrates through the gasket (211), a micro force sensor array (212) is arranged on the gasket (211), the rod force measurement unit (22) comprises a plurality of strain gauges (221), and the strain gauges (221) are arranged in a patch groove (14);
the wireless transmission module comprises a wireless gateway and a lead, wherein the lead penetrates through the lead through hole (13), and the lead is connected with the wireless gateway, the micro force sensor array (212) and the strain gauge (221).
2. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the micro force sensor array (212) is formed by arranging a plurality of micro force sensors into three circles, and comprises twenty-eight micro force sensors which are four, eight and sixteen respectively from inside to outside.
3. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the miniature force sensor can be a piezoelectric type or a pneumatic type force sensor.
4. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the head force measuring unit (21) further comprises a first protective washer (213) and a second protective washer (214), wherein the first protective washer (213) and the second protective washer (214) are respectively arranged on two sides of the gasket (211).
5. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the strain gauge is characterized in that the strain gauge (221) is made of semiconductor materials, the number of the patch grooves (14) is five, each ring comprises eight grooves which are uniformly distributed, and the strain gauge (221) is arranged in each groove.
6. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the single chip microcomputer module comprises a single chip microcomputer and an A/D converter;
the single chip microcomputer can carry out weighted average algorithm processing on the micro force sensor array (212) to judge whether the stress is uniform, and if the stress is not uniform, the average value is calculated through the weighted algorithm to reduce errors;
the differential output signal generated by the strain gauge (221) can be transmitted to an amplifier, and the amplified analog signal is converted into a digital signal through an A/D converter.
7. The bolt structure capable of measuring pressure and pressure in real time according to claim 1, wherein:
the data display module comprises a liquid crystal display, a numerical value setting button and an alarm;
the liquid crystal display is used for displaying the pressure value and the pressure value output by the singlechip;
the numerical value setting button is used for setting a safety limit value which can be borne by a device where the force measuring bolt (1) is located by a user according to an actual situation;
the alarm gives an alarm when the numerical value measured by the force measuring bolt (1) is greater than the safety value set by a user.
8. A method for measuring pressure and pressure in real time by using a bolt structure according to any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: three circles of micro force sensor arrays (212) are distributed on the gasket (211), and the coefficient ratios from inside to outside are respectively k1、k2、k3The numerical value of each circle of measurement is processed by the single chip microcomputer to obtain a weighted average value and multiplied by respective coefficients to obtain a final force measurement result;
step two: when the strain gauge (221) attached in the patch groove (14) is stressed, the bridge is unbalanced, a differential pressure signal is output, and a designed bridge circuit automatically compensates temperature in the process;
step three: signals measured by the micro force sensor array (212) and differential pressure signals generated by the strain gauge (221) are transmitted to a wireless node through a wire, and are transmitted to the single chip microcomputer through a wireless gateway to be received, processed and output;
step four: the operational amplifier amplifies the original signal received by the singlechip to an electric signal which can be identified by the data acquisition card;
step five: the A/D converter converts the amplified electric signals collected by the data acquisition card into digital signals;
step six: the single chip microcomputer outputs the pressure value and the pressure value calculated by the internal algorithm to a liquid crystal display, and compares a safety value set by a user with a measurement value of the force measuring bolt (1) in real time;
step seven: the output value of the single chip microcomputer is visually displayed, and the condition that the output value exceeds a set value is alarmed in real time, so that a user is reminded of stopping operation in time.
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| CN201911105419.2A CN111059123A (en) | 2019-11-13 | 2019-11-13 | Bolt structure capable of measuring pressure and intensity of pressure in real time |
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| CN201911105419.2A CN111059123A (en) | 2019-11-13 | 2019-11-13 | Bolt structure capable of measuring pressure and intensity of pressure in real time |
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| CN111693199A (en) * | 2020-05-05 | 2020-09-22 | 南昌大学 | Bolt, measuring system and measuring method for accurately measuring pressure in real time |
| CN112360860A (en) * | 2020-11-06 | 2021-02-12 | 南昌大学 | Threaded hole structure capable of accurately measuring threaded connection state in real time |
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