CN105241551A - Temperature detection method of thermofusion welding machine - Google Patents
Temperature detection method of thermofusion welding machine Download PDFInfo
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- CN105241551A CN105241551A CN201510532543.2A CN201510532543A CN105241551A CN 105241551 A CN105241551 A CN 105241551A CN 201510532543 A CN201510532543 A CN 201510532543A CN 105241551 A CN105241551 A CN 105241551A
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Abstract
The invention relates to a temperature detection method of a thermofusion welding machine. The detection method comprises the steps that a) after the temperature of an indicating hot plate of the welding machine reaches a nominal temperature T, a heating surface at one side of the hot plate is shot in a thermal imagery manner to obtain a thermal image; b) a point of the highest temperature in the thermal image is selected as the high temperature feature point, and according to the position of the high temperature feature point in the thermal image, temperature measurement is carried out at a corresponding position in the heating surface to obtain the temperature TH of the high temperature point; or/and a point of the lowest temperature in the thermal image is selected as the low temperature feature point, and according to the position of the low temperature feature point in the thermal image, temperature measurement is carried out at a corresponding position in the heating surface to obtain the temperature TL of the low temperature point; and c) the temperature uniform feature of the hot plate of the welding machine is obtained according to the nominal temperature T, the temperature TH of the high temperature point or/and the temperature TL of the low temperature point. The practical temperature distribution state of the heating surface can be reflected, and the workload of measurement is reduced.
Description
Technical field
The invention belongs to measurement, detection field, be specifically related to a kind of hot-melt welding machine temperature checking method.
Background technology
Polyethylene pipe for delivery of fuel gas often adopts hot-melt welding machine to carry out sweat soldering, and the quality of welding is directly by the performance impact of welding machine, and the inspection work of hot-melt welding machine performance is very necessary.Because hot-melt welding machine is provided with hot plate, adopt hot plate heating to weld, in the inspection project of hot-melt welding machine, the temperature homogeneity of hot plate and deviation have direct impact as important index to welding effect.General hot plate temperature uniformity detecting method is, adopt homogeneity and the display deviation of contact type thermometric indicator measuring tempeature, carry out reconnaissance measurement in the both side surface of hot plate according to the equally distributed rule of geometric configuration, the quantity that every side is chosen be 12 (measurement point is as shown in Fig. 11 to 12) or be greater than 12.Temperature on hot plate is not only relevant with geometric configuration, and the point selected by general detection mode can not reflect the actual distribution situation of actual hot plate temperature, occurs deviation.
Summary of the invention
Based on this, the invention reside in the defect overcoming prior art, provide a kind of hot-melt welding machine temperature checking method, heating face high temperature dot temperature and low warm spot temperature survey accurately, and can reduce surveying work amount.
Concrete scheme is as follows:
A kind of hot-melt welding machine temperature checking method, testing process comprises step: after the temperature of a. welding machine instruction hot plate reaches nominal temperature T, hot plate is wherein carried out to thermal imaging and takes pictures in the heating face of side, obtains thermograph; B. choose point that in thermograph, temperature is the highest as high-temperature characteristic point, according to the position of high-temperature characteristic point in thermograph, on heating face, temperature survey is carried out in corresponding position, obtains high temperature dot temperature T
h; Or/and choosing the minimum point of temperature in thermograph is low temperature characteristics point, according to the position of low temperature characteristics point in thermograph, on heating face, temperature survey is carried out in corresponding position, obtains low warm spot temperature T
l; C. according to nominal temperature T, high temperature dot temperature T
h, obtain the homogeneous temperature characteristic of welding machine hot plate; Or/and, according to nominal temperature T, low temp. electric temperature T
l, obtain the homogeneous temperature characteristic of welding machine hot plate.
Wherein in an embodiment, at least twice thermal imaging is carried out to heating face and takes pictures, obtain at least two thermographs, choose described high-temperature characteristic point often opening in thermograph respectively, measure the high temperature dot temperature T that described in each, high-temperature characteristic point is corresponding respectively
h; Or/and, choose described low temperature characteristics point often opening in thermograph respectively, measure the low warm spot temperature T that low temperature characteristics point described in each is corresponding respectively
l.
Wherein in an embodiment, carry out that thermal imaging takes pictures for twice interval greater than or equal 5 minutes.
Wherein in an embodiment, if high-temperature characteristic point position selected on two thermographs overlaps, then it is described high-temperature characteristic point that the rest position of a thermograph wherein chooses the highest point of temperature; Or/and if low temperature characteristics point that two thermographs are chosen overlaps, then it is described low temperature characteristics point that the rest position of a thermograph wherein chooses the minimum point of temperature.
Wherein in an embodiment, when temperature survey is carried out in the relevant position on heating face, first measure the temperature of described low temperature characteristics point, then measure the temperature of described high-temperature characteristic point.
Wherein in an embodiment, in testing process, residing for heating face, the wind speed of environment is less than 0.2m/s.
Wherein in an embodiment, after the temperature of welding machine instruction hot plate reaches nominal temperature T, maintaining heat board status is more than or equal to 15 minutes, and then carries out detecting hot plate.
Wherein in an embodiment, described high-temperature characteristic point is at least two, chooses the highest point of temperature in turn as described high-temperature characteristic point; Or/and described low temperature characteristics point is at least two, choose the minimum point of temperature in thermograph in turn as described low temperature characteristics point.
Wherein in an embodiment, according to brightness shown in thermograph, choose the maximum point of brightness in thermograph as described high-temperature characteristic point, or/and, choose the minimum point of brightness in thermograph as described low temperature characteristics point.
Wherein in an embodiment, when each heating face, its all high temperature dot temperature T
h, low warm spot temperature T
lthe and when difference between nominal temperature T is less than or equal to 6 DEG C, and high temperature dot temperature T
h, low warm spot temperature T
ldifference between central maxima and minima is less than or equal to 8 DEG C, and all high temperature dot temperature T
hmean value, all low warm spot temperature T
lmean value and the deviation of nominal temperature T be all less than or equal to 4 DEG C, and all high temperature dot temperature T
hstandard deviation, all low warm spot temperature T
lstandard deviation when being less than or equal to 5 DEG C, the temperature homogeneity of hot-melt welding machine hot plate is qualified, otherwise its temperature homogeneity is defective.
Beneficial effect of the present invention is:
High-temperature characteristic point (or/and the low temperature characteristics point) position on heating face is obtained by thermograph, and then on heating face, temperature survey is carried out in corresponding position, obtains the peak temperature (or/and minimum point temperature) in heating face, what lost efficacy due to the distributional difference of hot plate heater block and use rear section heater block existence for a long time may wait various reasons, actual Temperature Distribution has certain uncertainty, and thermograph takes the actual temperature state of hot plate, can the actual distribution situation of reflect heat plate temperature, choose in high-temperature characteristic point (or/and low temperature characteristics point) according to thermograph, measured peak temperature (or/and minimum point temperature) can reflect the actual temperature distribution situation in heating face, ensure to carry out test and repair accurately and effectively to temperature homogeneity and deviation.
In addition, due to when general detection method chooses temperature measuring point according to the geometric configuration of hot plate all with division, there is certain blindness, so need to choose abundant measurement point, the error choosing sample is reduced with this, more owing to choosing measurement point, add the workload of measurement, too increase the workload of data record and process simultaneously.Detection method provided by the invention, can accurately choose point that on hot hair updo hot side, temperature is the highest and the minimum point of temperature carries out temperature survey, and the quantity of high-temperature characteristic point and low temperature characteristics point is few, can reduce surveying work amount.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of general hot-melt welding machine temperature checking method;
Fig. 2 is the thermal imaging schematic diagram in one of them heating face in the embodiment of the present invention.
Description of reference numerals:
100, generate heat face, and 210, high-temperature characteristic point, 220, low temperature characteristics point.
Embodiment
Below the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Consult Fig. 1, hot-melt welding machine has hot plate and heating arrangement, and heating arrangement heats hot plate, and hot plate is tabular, and two relative plate faces are respectively two heating faces 100.
As shown in Figure 2, hot-melt welding machine temperature detection process comprises the following steps:
A. start welding machine, treat that the temperature of welding machine instruction hot plate reaches nominal temperature T; After the temperature of welding machine instruction hot plate reaches nominal temperature T, maintaining heat board status is more than or equal to 15 minutes.
B. carry out twice thermal imaging to the heating face 100 of hot plate first side to take pictures, obtain two thermographs 300; Twice thermal imaging take pictures interval greater than or equal 5 minutes, due to distributional difference and the heat dissipation characteristics of welding machine heater block, heating face 100 temperature can change along with the time, interval is carried out second time thermal imaging after (or more than 5 minutes) in 5 minutes and is taken pictures, this temporal difference can be reflected, better the temperature distributing characteristic in reflection heating face 100.
C. wherein in a thermograph, refer to Fig. 2, choose brightness the highest 2 for high-temperature characteristic point 210, also brightness the highest 2 is chosen for high-temperature characteristic point 210 in another thermograph, so, choose four high-temperature characteristic points altogether, determine the physical location of high-temperature characteristic point 210 on heating face 100 according to thermograph 300, relevant position on heating face 100 is measured, and obtains four high temperature dot temperature T
h; Wherein in a thermograph A, choose brightness minimum 2 for low temperature characteristics point 220, brightness minimum 2 is chosen for low temperature characteristics point 220 in another thermograph A, so, choose four low temperature characteristics points 220 altogether, determine the physical location of low temperature characteristics point 220 on heating face 100 according to thermograph 300, the relevant position on heating face 100 is measured, and obtains four low warm spot temperature T
l;
Contact thermocouple can be adopted to carry out temperature survey, other contacts or contactless temperature survey mode also can be adopted to carry out temperature survey.When adopting contact thermocouple to carry out temperature survey, first measure low warm spot temperature T
l, high temperature dot temperature T
h, and give thermopair between twice measurement and dispel the heat the time fully, avoid thermopair to dispel the heat and not in time error is caused to temperature survey;
In this step, if high-temperature characteristic point 210 position chosen on two thermographs overlaps, the point rest position of a then thermograph wherein reselecting temperature the highest is high-temperature characteristic point 210, if the low temperature characteristics point 220 chosen on two thermographs overlaps, then the some rest position of a thermograph wherein reselecting temperature minimum is low temperature characteristics point 220;
But be not limited to the present embodiment, also can select single one high-temperature characteristic point 210, low temperature characteristics point 220 often opening on thermograph as required, also can choose plural high-temperature characteristic point 210, low temperature characteristics point 220.
D., after the heating face, wherein side 100 of hot plate being detected, repeat said process, another heating face of hot plate is detected.
E. according to nominal temperature T, high temperature dot temperature T
h, low warm spot temperature T
lobtain the homogeneous temperature characteristic of welding machine hot plate.When the face that generates heat for each, its all high temperature dot temperature T
h, low warm spot temperature T
lthe and when difference between nominal temperature T is less than or equal to 6 DEG C, and high temperature dot temperature T
h, low warm spot temperature T
ldifference between central maxima and minima is less than or equal to 8 DEG C, and all high temperature dot temperature T
hmean value, all low warm spot temperature T
lmean value and the deviation of nominal temperature T be all less than or equal to 4 DEG C, and all high temperature dot temperature T
hstandard deviation, all low warm spot temperature T
lstandard deviation when being less than or equal to 5 DEG C, the temperature homogeneity of hot-melt welding machine hot plate is qualified, otherwise its temperature homogeneity is defective.
In above-mentioned testing process, the correlation computations of the measurement of high temperature dot temperature and low warm spot temperature, the homogeneous temperature characteristic of hot plate can synchronously carry out or intersect carrying out, and is not limited to the sequence of steps in the present embodiment.
In above-mentioned testing process, residing for the heating face 100 of guarantee hot plate, the wind speed of environment is less than 0.2m/s.Reduce air flow the heat transfer effect caused as far as possible, reduce the impact of air flowing on the homogeneity of face 100 Temperature Distribution of generating heat.
The thermal imaging system adopted in the present embodiment carries out thermal imaging to the heating face of hot plate 100 and takes pictures, the brightness that the region that in the thermograph of its shooting, temperature is higher demonstrates is larger, the highest point of brightness is the point that temperature is the highest, be chosen for high-temperature characteristic point 210, the minimum point of brightness is the point that temperature is minimum, is chosen for low temperature characteristics point 220.But be limited to the present embodiment, other thermal imaging devices also can be adopted to carry out thermal imaging and take pictures, choose the highest point of temperature or the minimum point of temperature by color, colour temperature or other features.
In addition, due to when general detection method chooses temperature measuring point according to the geometric configuration of hot plate all with division, there is certain blindness, so need to choose abundant measurement point, the error choosing sample is reduced with this, more owing to choosing measurement point, add the workload of measurement, too increase the workload of data record and process simultaneously.Detection method provided by the invention, can accurately choose point that on hot hair updo hot side 100, temperature is the highest and the minimum point of temperature carries out temperature survey, and the quantity of high-temperature characteristic point 210 and low temperature characteristics point 220 is few, can reduce surveying work amount.
Each technical characteristic of above embodiment can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
Above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a hot-melt welding machine temperature checking method, is characterized in that, testing process comprises step:
A. after the temperature of welding machine instruction hot plate reaches nominal temperature T, hot plate is wherein carried out thermal imaging and taken pictures in the heating face of side, obtain thermograph;
B. choose point that in thermograph, temperature is the highest as high-temperature characteristic point, according to the position of high-temperature characteristic point in thermograph, on heating face, temperature survey is carried out in corresponding position, obtains high temperature dot temperature T
h;
Or/and choosing the minimum point of temperature in thermograph is low temperature characteristics point, according to the position of low temperature characteristics point in thermograph, on heating face, temperature survey is carried out in corresponding position, obtains low warm spot temperature T
l;
C. according to nominal temperature T, high temperature dot temperature T
h, obtain the homogeneous temperature characteristic of welding machine hot plate; Or/and, according to nominal temperature T, low temp. electric temperature T
l, obtain the homogeneous temperature characteristic of welding machine hot plate.
2. hot-melt welding machine temperature checking method according to claim 1, it is characterized in that, carry out at least twice thermal imaging to heating face to take pictures, obtain at least two thermographs, choose described high-temperature characteristic point often opening in thermograph respectively, measure the high temperature dot temperature T that described in each, high-temperature characteristic point is corresponding respectively
h;
Or/and, choose described low temperature characteristics point often opening in thermograph respectively, measure the low warm spot temperature T that low temperature characteristics point described in each is corresponding respectively
l.
3. hot-melt welding machine temperature checking method according to claim 2, is characterized in that, carry out that thermal imaging takes pictures for twice interval greater than or equal 5 minutes.
4. hot-melt welding machine temperature checking method according to claim 2, it is characterized in that, if high-temperature characteristic point position selected on two thermographs overlaps, then it is described high-temperature characteristic point that the rest position of a thermograph wherein chooses the highest point of temperature;
Or/and if low temperature characteristics point that two thermographs are chosen overlaps, then it is described low temperature characteristics point that the rest position of a thermograph wherein chooses the minimum point of temperature.
5. hot-melt welding machine temperature checking method according to claim 1, is characterized in that, when temperature survey is carried out in the relevant position on heating face, first measures the temperature of described low temperature characteristics point, then measures the temperature of described high-temperature characteristic point.
6. hot-melt welding machine temperature checking method according to claim 1, is characterized in that, in testing process, residing for heating face, the wind speed of environment is less than 0.2m/s.
7. hot-melt welding machine temperature checking method according to claim 1, it is characterized in that, after the temperature of welding machine instruction hot plate reaches nominal temperature T, maintaining heat board status is more than or equal to 15 minutes, and then hot plate is wherein carried out to thermal imaging and takes pictures in the heating face of side.
8., according to the arbitrary described hot-melt welding machine temperature checking method of claim 1 to 7, it is characterized in that, described high-temperature characteristic point is at least two, chooses the highest point of temperature in turn as described high-temperature characteristic point;
Or/and described low temperature characteristics point is at least two, choose the minimum point of temperature in thermograph in turn as described low temperature characteristics point.
9. according to the arbitrary described hot-melt welding machine temperature checking method of claim 1 to 7, it is characterized in that, according to brightness shown in thermograph, choose the maximum point of brightness in thermograph as described high-temperature characteristic point, or/and, choose the minimum point of brightness in thermograph as described low temperature characteristics point.
10., according to the arbitrary described hot-melt welding machine temperature checking method of claim 1 to 7, it is characterized in that, when each heating face, its all high temperature dot temperature T
h, low warm spot temperature T
lthe and when difference between nominal temperature T is less than or equal to 6 DEG C, and high temperature dot temperature T
h, low warm spot temperature T
ldifference between central maxima and minima is less than or equal to 8 DEG C, and all high temperature dot temperature T
hmean value, all low warm spot temperature T
lmean value and the deviation of nominal temperature T be all less than or equal to 4 DEG C, and all high temperature dot temperature T
hstandard deviation, all low warm spot temperature T
lstandard deviation when being less than or equal to 5 DEG C, the temperature homogeneity of hot-melt welding machine hot plate is qualified, otherwise its temperature homogeneity is defective.
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| CN201510532543.2A CN105241551A (en) | 2015-08-26 | 2015-08-26 | Temperature detection method of thermofusion welding machine |
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| CN201510532543.2A CN105241551A (en) | 2015-08-26 | 2015-08-26 | Temperature detection method of thermofusion welding machine |
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Cited By (2)
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| TWI644288B (en) * | 2018-02-08 | 2018-12-11 | 力成科技股份有限公司 | Detection method of hot plate surface |
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Application publication date: 20160113 |