CN2315528Y - Inductive metal plate thickness measurer - Google Patents
Inductive metal plate thickness measurer Download PDFInfo
- Publication number
- CN2315528Y CN2315528Y CN 98203130 CN98203130U CN2315528Y CN 2315528 Y CN2315528 Y CN 2315528Y CN 98203130 CN98203130 CN 98203130 CN 98203130 U CN98203130 U CN 98203130U CN 2315528 Y CN2315528 Y CN 2315528Y
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- China
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- head
- voltage comparator
- output
- amplifier
- plate thickness
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to a measurer which comprises a thickness gauge, and a measuring head that is composed of an emitting head and a receiving head. The thickness gauge is composed of a machine case, a power supply, a high-frequency oscillator, a power amplifier, a measurement amplifier, a voltage comparator and a switching value follower. Both of the emitting head and the receiving head are composed of a casing, coils in the casing and thermistors, wherein, the coils are connected in series with the thermistors. The output terminal of the high frequency oscillator is connected with the emitting head through a power amplifier, the output terminal of the emitting head is coupled to the receiving head, the output of the receiving head is connected to the input terminal of the voltage comparator through the measurement amplifier, and the output terminal of the voltage comparator drives the switching value follower. The utility model has the advantages of low cost, large measuring range and high measuring precision.
Description
The utility model relates to a kind of instrument that detects plate thickness or position, belongs to the electronic measuring instrument field.
On the feed mechanism of equipment such as sheet metal printing machine, coating machine, automatic punching machine,, need to detect the thickness of sheet metal for preventing two open or many plates enter machine.At present many measurement means such as electromagnetic induction detect sheet metal with X ray, nuclear radiation, and this quasi-instrument generally includes thicknessmeter, by emitting head with receive the gauge head that head is formed.Though the measuring accuracy of X ray, nuclear radiation thicknessmeter is high, equipment cost is also higher.The measurement range of present existing electromagnetic induction thicknessmeter is less, and thickness measuring is 25mm only, and emitting head and the distance that receives between the head only are 40mm.
In view of above-mentioned, the purpose of this utility model just provides the plate thickness measuring instrument that a kind of cost is low, measurement range is big, measuring accuracy is high.
For achieving the above object, the utility model adopts following design proposal:
Induction type plate thickness measuring instrument comprises thicknessmeter, by emitting head with receive the gauge head that head is formed, it is characterized in that: thicknessmeter is made of cabinet, power supply, high frequency oscillator, power amplifier, measuring amplifier, voltage comparator, switching value follower; Emitting head and reception head constitute by coil in shell, the shell and thermistor, coil and thermistor series connection; The output of high frequency oscillator inserts emitting head through power amplifier, and the reception head is coupled in the output of emitting head, and the output that receives head connects the input of voltage comparator, the output driving switch amount follower of voltage comparator through measuring amplifier.
In concrete implementing measure of the present utility model:
Described high frequency oscillator is by operational amplifier, the in-phase input end that is connected on this operational amplifier and the resistance between the ground, the inverting input that is connected on this operational amplifier and the electric capacity between the ground, is connected on the output terminal of this operational amplifier and two degree of depth negative feedback oscillatory circuits that feedback resistance constituted between two input ends respectively.
Described coil is the duolateral air core coil.
Described switching value follower is made of light emitting diode and relay series connection, and the output of described measuring amplifier connects the inverting input of described voltage comparator, and the in-phase input end of described voltage comparator connects comparative voltage.
The utlity model has following advantage:
1. because high frequency oscillator adopts degree of depth negative feedback oscillatory circuit, so electric performance stablity, circuit is simple, frequency stability can reach 0.01%;
2. because coil adopts universal winding, and distributed capacitance is little, makes launching circuit and receiving loop work in the forced oscillation state,,, improved stability so lowered electromagnetic field parameter shift when factors such as temperature cause parameter shift greatly away from tuning-points;
3. owing to seal in thermistor, its characteristic is a negative temperature coefficient, makes its parameter select to be complementary with coil copper resistance temperature coefficient, but the all-in resistance in the compensate for variations in ambient temperature fluctuation range change, cooperate with the heading advantage, can make the signal stabilization degree reach 0.1% order of magnitude;
4. because it is simple in structure, so cost is minimized;
5. owing to adopted power amplifier and measuring amplifier, so measurement range is big, the spacing maximum of its emitting head and reception head can reach 2m, and the thickness of the sheet metal that detects can reach 250mm.
Below in conjunction with drawings and Examples the utility model is elaborated.
Fig. 1 is circuit theory diagrams of the present utility model.
The utility model comprises thicknessmeter, by emitting head with receive the gauge head that head is formed.Thicknessmeter is made of cabinet, power supply, high frequency oscillator, power amplifier, measuring amplifier, voltage comparator, switching value follower; Emitting head and reception head constitute by coil in shell, the shell and thermistor, coil and thermistor series connection.The output of high frequency oscillator inserts emitting head through power amplifier, and the reception head is coupled in the output of emitting head, and the output that receives head connects the input of voltage comparator, the output driving switch amount follower of voltage comparator through measuring amplifier.
See also Fig. 1.Transformer B1, rectifier bridge D7～D10, integrated regulator IC5～IC6, filter capacitor C7～C10 form the positive-negative power circuit.High frequency oscillator is by operational amplifier IC1, the in-phase input end that is connected on IC1 and the resistance R between the ground 3, the inverting input that is connected on IC1 and the capacitor C between the ground 1, is connected on the output terminal of IC1 and the degree of depth negative feedback oscillatory circuit that two feedback resistances R1 and R2 between two input ends are constituted respectively, wherein: C1 adopts polycarbonate electric capacity, R1～R3 is the low-temperature coefficient precision resistance, and they can make oscillation frequency stability reach 0.01%.Power amplifier is by two transistor Ts 1 and T2 and connect and constitute, and is connected to diode D1 and D2 between their collection-emitter-base bandgap grading respectively.The coil L1 and the thermistor RT1 series loop that are contained in the emitting head shell constitute emitting head, be contained in the coil L2 and the thermistor RT2 series loop that receive in the shell and constitute the reception head, coil L1 and L2 are the duolateral air core coil, emitting head is identical with the structure that receives head, but the parameter of both coils and thermistor is different.Adopting the purpose of air core coil is to reduce distributed capacitance, makes launching circuit and receiving loop work in the forced oscillation state, and away from tuning-points, the electromagnetic field parameter shift in the time of can lowering factor such as temperature and cause parameter shift improves stability; Adopting the purpose of thermistor is that its characteristic is a negative temperature coefficient, selects its parameter and coil copper resistance temperature coefficient to be complementary, but the variation of the all-in resistance in the compensate for variations in ambient temperature fluctuation range makes signal stabilization.Measuring amplifier is made up of operational amplifier IC2, resistance R 4～R7, capacitor C 2～C3, diode D3～D4.Voltage comparator is made up of operational amplifier IC3, resistance R 8 and R10～R11, capacitor C 4, potentiometer W1, and the in-phase input end of IC3 connects comparative voltage, and this comparative voltage is given through resistance R 10 and potentiometer W1 by positive-negative power.The switching value follower is made of LED 1 and relay J 1 series connection.
Wherein: the output of IC1 connects the base stage of two transistor T 1～T2 in the power amplifier in the high frequency oscillator, the output of power amplifier connects emitting head through plug CH1, the reception head is coupled in the output of emitting head, the output that receives head connects the inverting input of IC2 in the measuring amplifier through plug CH1, the output of IC2 connects the inverting input of IC3 in the voltage comparator, the output driving switch amount follower of voltage comparator.
Narrate the principle of work of this instrument below.
High frequency oscillator produces stable waveform, after amplifying, power amplifier sends into emitting head again, in the coil of emitting head, generate an electromagnetic field, this electromagnetic field produces eddy current in the sheet metal that passes between emitting head and the reception head, this eddy current causes energy loss on the one hand, produce counter magnetic field on the one hand, make a reception signal that is received weaken with the thickness increase of sheet metal, after the signal that receives head amplified again with the comparative voltage of characterizing metal plate thickness set-point relatively, determine by result relatively whether machine needs to stop.
When the thickness that passes the sheet metal between emitting head and the reception head exceeds given thickness, receive a signal that is added to the voltage comparator inverting input and be weaker than comparative voltage, so comparer output high level, light LED1, and J1 is got, J1 get electric after, its contact is immediately with machine outage brake, the accident that prevents takes place.
For metal sheet, because its energy loss that causes and counter magnetic field are all smaller, so be difficult for measuring.Can strengthen the capacity of capacitor C 1 this moment, and the oscillation frequency of high frequency oscillator is increased thereupon, so just can strengthen energy loss and counter magnetic field that metal sheet causes.
When plate thickness increased, energy loss that it causes and counter magnetic field also can strengthen.Since the electromagnetic field that air core coil produces a little less than, therefore in order to improve measuring accuracy, need the electromagnetic field of corresponding increasing emitting head emission, at this moment can in coil, insert NX-100 FERRITE CORE (being applicable to slab) or MXD-200 FERRITE CORE (being applicable to special heavy plate).
If the voltage comparator in the empty frame among the figure is added, constitute the two-way voltage comparator, the bound that then can carry out hickness of metal plate detects: the road comparer has signal output and when setting out on a journey no-output, shows thickness of slab under the upper limit, on the lower limit instantly, belongs to normal; When the two-way comparer all has signal output, represent the super upper limit; When the equal no signal of two-way comparer is exported, represent super lower limit.
This instrument can have following three kinds of purposes:
1. be used for the continuous thickness measuring of sheet metal and monitor control;
2. be used for preventing on the production line two opening, many plates stick together and enter feeder simultaneously, guarantee that veneer wood is transported to station;
3. cooperate with the high temperature gauge head, it is thick to can be used for the hot-rolling mill automatic control panel.
When being used for above-mentioned the 1st, 3 purposes, must be at the input end shunt voltage current converter of voltage comparator, the level of measuring amplifier output is converted into 4～20mA current signal, and after adjusting, the physics range of this current signal representative is plate thickness.
This instrument can replace measurement means such as X ray, nuclear radiation and detect sheet metal, and measuring accuracy reaches the level equal with it.
Claims (5)
1. induction type plate thickness measuring instrument comprises thicknessmeter, by emitting head with receive the gauge head that head is formed, and it is characterized in that:
Described thicknessmeter is made of cabinet, power supply, high frequency oscillator, power amplifier, measuring amplifier, voltage comparator, switching value follower;
Described emitting head and reception head constitute by coil in shell, the shell and thermistor, coil and thermistor series connection;
The output of high frequency oscillator inserts emitting head through power amplifier, and the reception head is coupled in the output of emitting head, and the output that receives head connects the input of voltage comparator, the output driving switch amount follower of voltage comparator through measuring amplifier.
2. induction type plate thickness measuring instrument as claimed in claim 1 is characterized in that: described high frequency oscillator is by operational amplifier, is connected on this computing and puts in-phase input end and the resistance between the ground, the inverting input that is connected on this operational amplifier and the electric capacity between the ground of device too, be connected on the output terminal of this operational amplifier and two degree of depth negative feedback oscillatory circuits that feedback resistance constituted between two input ends respectively.
3. induction type plate thickness measuring instrument as claimed in claim 1 is characterized in that: described coil is the duolateral air core coil.
4. induction type plate thickness measuring instrument as claimed in claim 1, it is characterized in that: described switching value follower is made of light emitting diode and relay series connection, the output of described measuring amplifier connects the inverting input of described voltage comparator, and the in-phase input end of described voltage comparator connects comparative voltage.
5. induction type plate thickness measuring instrument as claimed in claim 4 is characterized in that: the input end shunt voltage current converter of described voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98203130 CN2315528Y (en) | 1998-04-03 | 1998-04-03 | Inductive metal plate thickness measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98203130 CN2315528Y (en) | 1998-04-03 | 1998-04-03 | Inductive metal plate thickness measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2315528Y true CN2315528Y (en) | 1999-04-21 |
Family
ID=33960024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98203130 Expired - Fee Related CN2315528Y (en) | 1998-04-03 | 1998-04-03 | Inductive metal plate thickness measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2315528Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376047A (en) * | 2012-04-16 | 2013-10-30 | 安华高科技通用Ip(新加坡)公司 | Apparatus and method for measuring thickness of printed circuit board |
| CN103615968B (en) * | 2013-12-02 | 2017-01-18 | 北京金自天正智能控制股份有限公司 | Method for improving stability of cold rolling inductance type centering detector |
-
1998
- 1998-04-03 CN CN 98203130 patent/CN2315528Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376047A (en) * | 2012-04-16 | 2013-10-30 | 安华高科技通用Ip(新加坡)公司 | Apparatus and method for measuring thickness of printed circuit board |
| CN103615968B (en) * | 2013-12-02 | 2017-01-18 | 北京金自天正智能控制股份有限公司 | Method for improving stability of cold rolling inductance type centering detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |