WO2017032000A1

WO2017032000A1 - Apparatus and method for detecting hot-melt welder temperature of polyethylene pressure pipe

Info

Publication number: WO2017032000A1
Application number: PCT/CN2016/080100
Authority: WO
Inventors: 李仕平; 李茂东; 杨波; 陈志刚; 吴文栋; 李智; 林金梅; 王恋; 翟伟; 郑佩根; 涂欣
Original assignee: 广州特种承压设备检测研究院
Priority date: 2015-08-26
Filing date: 2016-04-25
Publication date: 2017-03-02
Also published as: CN105021313A; CN105021313B

Abstract

An apparatus and method for detecting the hot-melt welder temperature of a polyethylene pressure pipe. The apparatus for detecting the hot-melt welder temperature of a polyethylene pressure pipe comprises a bracket. The bracket comprises at least two support rods (100), wherein at least one support rod (100) or its extension cord intersects with another support rod (100) or its extension cord. At least one thermal probe (200) is provided on the support rod (100). The thermal probe (200) is in sliding connection with the support rod (100), and the sliding direction is the lengthwise direction of the support rod (100). The thermal probe (200) has a signal output terminal. At least two thermal probes (200) lie on the same side of the bracket. By sliding the thermal probe (200), the position of the thermal probe (200) can be adjusted to perform temperature detection at a specific position point on a heat-emitting face. Moreover, if adopting a single thermal probe (200) for repeated measurement, when the temperature rise obtained by the thermal probe (200) in a previous measurement cannot be dissipated and decreased timely, an error may arise in the next measurement of the thermal probe (200), whereas if adopting multiple thermal probes (200) to measure multiple points to be measured at the same time, such a measurement error can be eliminated, thereby improving the measurement accuracy.

Description

Polyethylene pressure pipe hot-melt welding machine temperature detecting device and method

Technical field

The invention belongs to the field of detection and measurement, and particularly relates to a temperature detecting device and method for a polyethylene pressure pipe hot-melt welding machine.

Background technique

The polyethylene pipe used for conveying gas is often hot-melt welded by a hot-melt welding machine. The quality of the welding is directly affected by the performance of the welding machine. It is necessary to test and test the performance of the hot-melt welding machine. Since the hot-melt welding machine is provided with a hot plate and is heated by hot plate heating, in the inspection and testing project of the hot-melt welding machine, the temperature uniformity and deviation of the hot plate as an important index have a direct influence on the welding effect. The general hot plate temperature uniformity detection uses a contact thermometer to measure the temperature of the heating surface of the hot plate. During the measurement, each point selected on the hot plate is sequentially measured using a contact temperature measuring instrument, and the data is sequentially recorded. This leads to more measurement times, easy to cause multiple or missed measurements, and can not measure the temperature of each point at the same time point, affecting the temperature distribution judgment at the same time, thus affecting the inspection conclusion of the hot plate.

Summary of the invention

Based on this, the present invention overcomes the defects of the prior art, and provides a polyethylene pressure pipe hot-melt welding machine temperature detecting device and method, which can simultaneously detect the temperature of a plurality of points on the hot plate, reduce the measurement workload, and reduce Small measurement error.

The specific plan is as follows:

A polyethylene pressure pipe hot-melt welding machine temperature detecting device comprises a bracket comprising at least two interconnected struts, wherein at least one strut or an extension thereof intersects another strut or an extension thereof, The struts are provided with at least one thermal probe, the thermal probe is slidably connected with the struts, and the sliding direction is the length direction of the struts, and the thermal probe has a signal output port, and at least two thermal probes are located on the same side of the struts.

A temperature detecting method includes: at least two thermal probes are located in the same environment, obtaining an ambient temperature value detected by at least two thermal probes, obtaining an average value of at least two of the ambient temperature values, Obtaining a deviation value between the ambient temperature values corresponding to the at least two thermal probes and the average value; at least two thermal probes are adjacent to one of the heating surfaces of the hot plate of the hot melt welding machine, and each of the thermal probes respectively corresponds to the heating surface At a point to be measured, a thermal probe is used to measure the corresponding point to be measured to obtain a test temperature value of each point to be measured; and the test temperature value of the point to be measured is added or subtracted from the deviation value of the corresponding heat probe as The final temperature value of the point to be measured.

In one embodiment, the bracket is further provided with a sleeve, the sleeve is slidably connected with the strut, and an elastic member is disposed in the sleeve, and one end of the elastic member and the sleeve are The bottom wall or side wall abuts and the other end interfaces with the thermal probe, the sleeve being provided with an opening for the thermal probe to enter and exit.

In one embodiment, a sub-frame is further included, one end of the sub-frame being detachably coupled to the bracket, and the other end of the sub-frame being remote from the bracket.

In one embodiment, the sub-frame includes at least two intersecting secondary rods, the first end of the secondary rod being remote from the bracket and being rotationally coupled to the first end of the other secondary rod, the secondary rod The second end is coupled to the bracket.

In one embodiment, the second end of the auxiliary rod is provided with a mounting hole, the opening of the mounting hole is located at a side of the auxiliary rod, the bracket is provided with a mounting recess, and near the mounting recess a rotating rod is provided, the first end of the rotating rod is rotatably connected with the bracket, and when the second end of the auxiliary rod extends into the mounting recess, the second end of the rotating rod extends into the seat Said inside the mounting hole.

In one of the embodiments, at least two of the struts are rotationally coupled and the axis of rotation is the intersection of the struts.

In one of the embodiments, at least two of the thermal probes are disposed on each of the struts.

In one of the embodiments, the middle portions of at least two of the struts intersect and are rotatably connected at the intersection.

In one embodiment, a multi-channel thermometer and computer are also included, the signal output port of the thermal probe being electrically coupled to the multi-channel thermometer, the multi-channel thermometer being electrically coupled to the computer.

The beneficial effects of the invention are:

The polyethylene pressure pipe hot-melt welding machine temperature detecting device comprises a bracket, and the bracket comprises at least two poles.

At least one strut or extension cord thereof intersects with another strut or an extension thereof, the strut being provided to There is one less heat probe, and each pole extends radially outward from the center with the intersection point. The heat probe can slide in the length direction of the pole, and the pole and the heat probe together form a temperature detecting network, and the sliding heat probe is passed through The position of the thermal probe can be adjusted to control the temperature of the point on the heating surface at a specific position; and the entire temperature detecting network has at least two thermal probes at the same time, each of which has a heat detecting surface, each heat The heat detecting surface of the probe is directed toward the same side of the bracket, and the temperature detecting device of the polyethylene pressure pipe hot-melt welding machine is placed against the heat generating surface to be detected, so that the heat detecting surface of each heat probe is simultaneously in contact with the heat generating surface, and simultaneously Detecting the temperature of at least two points, reducing the measurement workload, and improving the detection efficiency; in addition, if the measurement is repeated with a single thermal probe, the temperature rise obtained by the thermal probe cannot be reduced in time during the previous measurement, and the thermal probe will be next time. The measurement brings errors, and multiple thermal probes are used to measure multiple electrical measurements simultaneously, which can eliminate such measurement errors and improve Accuracy.

DRAWINGS

1 is a schematic view showing the use of a temperature detecting device for a polyethylene pressure pipe hot-melt welding machine according to an embodiment of the present invention;

2 is a schematic structural view of a temperature detecting device for a polyethylene pressure pipe hot-melt welding machine according to an embodiment of the present invention;

3 is a schematic structural view of a temperature detecting device for a polyethylene pressure pipe hot-melt welding machine according to an embodiment of the present invention;

Figure 4 is an enlarged view of A in Figure 3.

Description of the reference signs:

100, pole, 110, sleeve, 120, rotating rod, 200, thermal probe, 300, auxiliary rod, 310, mounting hole, 400, hot plate, 500, multi-channel thermometer, 600, computer.

detailed description

The present invention will be further described in detail below, but embodiments of the invention are not limited thereto.

As shown in Fig. 1, the hot melt welding machine has a hot plate 400 and a heating device. The heating device heats the hot plate 400. The hot plate 400 has a plate shape, and the two opposite plate faces are respectively two heat generating faces. When the hot-melt welding machine is subjected to thermal testing, the polyethylene pressure pipe hot-melt welding machine temperature detecting device comprises a bracket, a sub-frame, a heat probe 200, a multi-channel thermometer 500 and a computer 600. The bracket includes a plurality of struts 100. The struts 100 are provided with a thermal probe 200. The thermal detecting surface of the thermal probe 200 is closely attached to the heating surface for temperature detection, and the thermal probe 200 is connected to the computer 600 through the multi-channel thermometer 500. Temperature information The processing is performed by inputting the multi-channel thermometer 500 into the computer 600. The sub-frame includes a plurality of connected sub-bars 300 for the human hand grip. (The thermal probe 200 in the embodiment uses a thermocouple, but is not limited thereto, and other thermal detecting elements may also be used.)

As shown in FIG. 2, the bracket includes three intersecting struts 100, and the middle portions of the three struts 100 are rotatably connected, and each of the struts 100 is spaced apart by 60°, so that the three struts 100 constitute a circular shape. region. (Not limited thereto, the bracket may include one strut 100 or two strut 100 or three or more strut 100). Each struts 100 has two thermal probes 200 on each side of the point where they intersect with the other struts 100. Thus, each struts 100 is provided with four thermal probes 200, and a total of twelve brackets are provided on the struts 100. The thermal probe 200 can simultaneously perform temperature detection on twelve points on the heat generating surface.

As shown in FIGS. 3 and 4, the bracket is provided with a sleeve 110. The sleeve 110 is in one-to-one correspondence with the heat probe 200. The sleeve 110 is slidably connected with the strut 100, and the sliding direction is the length direction of the strut 100, and the sleeve is sleeved. The elastic member is disposed in the first embodiment. The elastic member is a spring, but is not limited thereto. One end of the elastic member is butted against the bottom wall or the side wall of the sleeve 110, and the other end is butted against the thermal probe 200. An opening heating probe 200 is provided for access.

As shown in Figures 1 and 3, each thermal probe 200 is located on the same side of the bracket, and the other side of the bracket is mounted with a sub-frame. The sub-frame includes at least two intersecting sub-bars 300, the second ends of the at least two sub-bars 300 intersect and are rotatably coupled to the other sub-bar 300, and the second end of the sub-bar 300 is coupled to the strut 100, The intersection between the auxiliary rods 300 is away from the bracket, so that the sub-frames form a triangle-like structure, so that the sub-frame structure is stable, and the hand holder can be held away from the heating surface to avoid burns. The auxiliary rod 300 is provided with a mounting hole 310. The opening of the mounting hole 310 is located at the side of the auxiliary rod 300. The supporting rod 100 is provided with a mounting recess, and a rotating rod 120 is disposed near the mounting recess. The first end of the rotating rod 120 is The bracket is rotatably coupled, and when the second end of the secondary rod 300 projects into the mounting recess, the second end of the rotating rod 120 extends into the mounting hole 310. When the second end of the auxiliary rod 300 is withdrawn from the mounting recess, the second end of the rotating rod 120 is disengaged from the mounting hole 310, and the sub-frame can be conveniently installed and removed from the bracket to facilitate the hot-melt welding of the entire polyethylene pressure pipe. Handling or storage of the machine temperature detecting device. Moreover, the sub-bar 300 of the sub-frame is rotatably connected with the sub-bar 300, and the sub-frame can be folded up during transportation or storage, and the space occupied is smaller.

Not limited to the embodiment, the bracket may further include an outer frame, and the outer frame is provided with an annular or partially annular slide rail, and at least one end of the support rod 100 is slidably mounted on the slide rail. Strut 100 and strut A rotational fit between the 100 and the rotational axis is the intersection of the strut 100. The bracket and the thermal probe 200 form a positioning mode similar to "polar coordinates". By adjusting the angle of the strut 100, the distance between the thermal probe 200 and the rotational axis, the position of the point to be measured on the heating surface is located, so that the thermal probe 200 It is possible to traverse all the points on the covered area by the struts 100. For the circular heating surface, temperature detection can be performed on any point on the heat generating surface, and the heat probe 200 can only be moved on a specific sliding path, which is convenient. operating.

When using a polyethylene pressure pipe hot-melt welder temperature detecting device for temperature detection, the temperature detecting method includes the following steps:

a. determining the position of the required measuring temperature point according to the radius of the hot-melt welding machine hot plate 400, and sliding the sleeve 110 on the branch according to the position, thereby adjusting the position of the thermal probe 200 to ensure that the thermal probe 200 can accurately correspond Selected measurement points.

b. Select the airless (wind speed <0.2m/s) environment, debug the multi-channel thermometer 500, the thermal probe 200 and the computer 600 to the normal use state, and place the thermal probe on the temperature detecting device of the polyethylene pressure pipe hot-melt welding machine. The plane is placed horizontally so that all the thermal probes 200 are at the same horizontal plane, reducing the error caused by the temperature difference in the height direction (the temperature rise tends to cause the air density to decrease, usually the upper air temperature is greater than the lower air temperature, causing the air temperature to be in the height direction There is a difference in the above; after the temperature value obtained by the thermal probe 200 in the computer 600 is stable, the ambient temperature values measured by all the thermal probes 200 are averaged, and then the ambient temperature value and the average value of each thermal probe 200 are calculated. The value of the deviation between.

c. Starting the welding machine, the welding machine indicates that the temperature of the hot plate 400 reaches the nominal temperature T; when the welding machine indicates that the temperature of the hot plate 400 reaches the nominal temperature T, the bracket is flatly attached to the heating surface to be detected, so that The thermal probe 200 can be closely attached to the temperature measuring point of the heat generating surface, and ensures that each heat probe 200 can stably contact the heat generating surface; at this time, the position between the heat probes 200 can be performed due to the elastic force of the elastic member. The fine adjustment makes it easy to adhere to the heat generating surface, and the elasticity of the elastic member presses the heat probe 200 on the heat generating surface to prevent the heat probe 200 from contacting the heat generating surface, and the benefit is improved.

d. After the temperature values obtained by the thermal probe 200 in the computer 600 are stabilized, the test temperature values detected by each thermal probe 200 are obtained, and the test temperature values of the thermal probes 200 are subtracted from the deviation values as the thermal probes 200. Final temperature value.

e. After the end of the detection of a heating surface of the hot plate 400, the polyethylene pressure pipe hot-melt welding machine temperature The degree detecting device is evacuated from the corresponding heat generating surface, and the heat probe 200 is placed in the air for more than or equal to 10 minutes, and then the temperature of the other heat generating surface of the hot plate 400 is detected to prevent the accuracy of the heat probe 200 from being affected by the original temperature.

f. After the two faces of the hot plate 400 are temperature-detected and recorded, the hot-melt welder is then turned off, and the detection process ends.

Due to the uncertainty of the thermal probe during manufacturing or use, the conventional thermal probe has a certain error range. For the thermocouple, the highest accuracy of the first-order thermocouple is ±1.5 °C. Moreover, since the evaluation standard of the hot plate inspection is ±5° C. which exceeds the number of the hot-melt welding machine, the measurement is performed in the temperature measurement of the different points by using different thermal probes, and the measurement in this embodiment is large. The method firstly measures the temperature of the thermal probe to the same environment, obtains an average value of the corresponding ambient temperature value, and obtains a deviation value between the ambient temperature value and the average value corresponding to each thermocouple, and the deviation value represents the measurement error of the thermal probe. Then, the heat probe is used to measure the heating surface of the hot plate, and the measured temperature value is obtained, and the deviation value is subtracted from each measured temperature value (according to the actual calculation, the deviation value may also be added) as the final temperature of the corresponding thermal probe. The value, the calculation method of subtracting (or adding) the deviation value corrects the measurement deviation of the thermal probe, and better eliminates the deviation between different thermocouples. Improve measurement accuracy. According to the need, it is also possible to determine whether the temperature measurement value of the thermal probe is available according to the deviation value of each thermal probe. If the deviation value of a thermal probe is too large, the data of the thermal probe may not be used, and the deviation value may be replaced excessively. The thermal probe is re-measured.

In addition, in the actual operation process, two heating surfaces of the hot plate 400 can be simultaneously detected by using two polyethylene pressure pipe hot-melt welding machine temperature detecting devices, so that the detection time can be shortened, and all temperature data are the same. The temperature data at the moment is more effective; if one temperature measuring device is used to measure the two heat generating surfaces in turn, the cost can be saved.

The sequence of operations in the above temperature detecting method can be adjusted according to actual needs. For example, all the data can be obtained by the detection and then poured into the computer for calculation.

The technical features of the above embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, It is considered to be the range described in this specification.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but It cannot be understood as a limitation on the scope of the invention patent. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A polyethylene pressure pipe hot-melt welding machine temperature detecting device, comprising: a bracket comprising at least two interconnected strut, at least one strut or an extension thereof and another strut or an extension thereof The line crosses, the struts are provided with at least one thermal probe, the thermal probe is slidably connected with the struts, and the sliding direction is the length direction of the struts, the thermal probe has a signal output port, and at least two thermal probes are located on the same side of the struts .
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to claim 1, wherein the bracket is further provided with a sleeve, and the sleeve is slidably connected with the strut, and the sleeve is inside An elastic member is disposed, one end of the elastic member abuts the bottom wall or the side wall of the sleeve, and the other end is abutted with the thermal probe, and the sleeve is provided with an opening for the thermal probe to enter and exit.
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to claim 1, further comprising a sub-frame, one end of the sub-frame being detachably connected to the bracket, and the other end of the sub-frame Keep away from the bracket.
A polyethylene pressure pipe hot-melt welder temperature detecting device according to claim 3, wherein said sub-frame comprises at least two intersecting sub-rods, said first end of said sub-rod being remote from said bracket and A first end of the other rod is rotatably coupled to the second end of the secondary rod.
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to claim 4, wherein the second end of the auxiliary rod is provided with a mounting hole, and the opening of the mounting hole is located at a side of the auxiliary rod, The bracket is provided with a mounting recess, and a rotating rod is arranged near the mounting recess, the first end of the rotating rod is rotatably connected with the bracket, and when the second end of the auxiliary rod extends into the mounting The second end of the rotating rod extends into the mounting hole when recessed.
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to claim 1, wherein at least two of said struts are rotationally fitted, and a rotational axis is an intersection of said struts.
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to any one of claims 1 to 6, wherein each of said strut is provided with at least two said thermal probes.
A polyethylene pressure pipe hot-melt welder temperature detecting device according to any one of claims 1 to 6, wherein at least two of said struts have a middle portion that intersects and is rotatably connected at the intersection.
The polyethylene pressure pipe hot-melt welding machine temperature detecting device according to any one of claims 1 to 6, The utility model is characterized in that it further comprises a multi-channel thermometer and a computer, the signal output port of the thermal probe is electrically connected to the multi-channel thermometer, and the multi-channel thermometer is electrically connected to the computer.
A temperature detecting method using the polyethylene pressure pipe hot-melt welding machine temperature detecting device according to any one of claims 1 to 9, characterized in that it comprises:

The at least two thermal probes are located in the same environment, and the ambient temperature values detected by the at least two thermal probes are obtained, and an average of at least two of the ambient temperature values is obtained, and the ambient temperature values corresponding to the at least two thermal probes are respectively obtained. The deviation between the average values;

At least two thermal probes are placed on one of the heating surfaces of the hot plate of the hot-melt welding machine, and each of the thermal probes respectively corresponds to a point to be measured on the heating surface, and the corresponding temperature of the to-be-measured point is measured by the thermal probe to obtain each The test temperature value of the point to be measured;

The test temperature value of the point to be measured is added or subtracted from the deviation value of the corresponding thermal probe as the final temperature value of the point to be measured.