CN1120490A - A method of automatically controlling the fusion process between thermoplastic articles - Google Patents
A method of automatically controlling the fusion process between thermoplastic articles Download PDFInfo
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- CN1120490A CN1120490A CN 94116323 CN94116323A CN1120490A CN 1120490 A CN1120490 A CN 1120490A CN 94116323 CN94116323 CN 94116323 CN 94116323 A CN94116323 A CN 94116323A CN 1120490 A CN1120490 A CN 1120490A
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Abstract
The auto-control method for hot fusion of thermoplastic resin objects includes several stages: Responding to start signal a current is supplied to resistor for fusing the opposite resn surfaces together. When power raises to a given value, the electric characteristics of resistor are calculated while the specific heat is calculated by on-off control. Based on the electric characteristics and specific heat, power is increased step-by-step and on-off is further controlled until their change coefficients is equal to or less than given values. Finally, power is not supplied when the specific heat is equal to or less than a predefined value.
Description
The present invention relates to a kind of method of automatic control the fusion process between thermoplastic articles.
So-called electric smelting splice grafting head (electro-fusion joint) (hereinafter referred to as ' EF joint ') can and be used for an object fixed with another object and has been connected.The example of those objects made from thermoplastic resin comprises water pipe, drainpipe and gas pipe.Each EF joint comprises a housing and is embedded in wherein heating electric wire that this housing also is to make with suitable thermoplastic resin.Electric current supply heating electric wire, be used for to thermoplastic joint and pipe heating and make their partial meltings, thereby make them be linked to be an integral body mutually.
The electric smelting hop controller of prior art (below be called ' EF controller ') has some to be suitable for control mode to the heating line powered.Those control modes relevant with the type of EF joint are stored in the storage device of EF controller.For controlling the electrical power of alloying process automatically, will select only control mode for use at used EF joint.
Yet aspect the resistance and temperature coefficient of heating electric wire (being resistor), the electrical characteristics of the EF joint of different manufacturers are mutually different.An EF controller can only be complementary with one type EF joint, and therefore, the pipeliner is subjected to economic loss owing to being equipped with complete various EF joint.
Therefore, an object of the present invention is the method that provides a kind of automatic control alloying process to the various thermoplastic pipes in all types and every type and joint.
Here the method that provides comprises following step: the initial signal that (1) begins in response to the indication alloying process, the electric current supply resistor, this resistor as thermoplastic resin relatively and the heater that fuses together of the superficial layer that closely contacts mutually, when electrical power is increased to predetermined level, the electrical characteristics of calculated resistance device, also, calculate the specific heat of resin by resistor being done on-off control; (2) in some stages in succession, increase electrical power step by step, and according to the electrical characteristics and the specific heat that in step (1), have recorded, and detect the change in electrical characteristics coefficient in each stage, and resistor is done further on-off control, detect the variation coefficient of specific heat in each stage; And (3) are last, when the variation coefficient of the specific heat that records in step (2) reaches or during less than a predetermined value, just stops to increase electrical power, but still continue on-off control, when specific heat itself is equal to or less than a predetermined value, just stop to supply with electrical power.
Step (3) can change like this, when from the on-off of described step (3) control beginning after after a while, just stop to supply with electrical power, here, be to be used in the specific heat of combustion that records in the step (2) to calculate during this period of time.
According to the present invention,, will determine an optimizing level for the electrical power of heating and partial melting resin object according to the electrical characteristics of the resistor that in alloying process, records and the physical property of resin.Like this, with comprising that the object that any kind of resin is done can successfully and exactly fuse together.
In the following some embodiments of the present invention that there is shown:
Fig. 1 is the control chart that the alloying process that in an embodiment thermoplastic articles is fused together is controlled automatically;
Fig. 2 is the EF joint among the embodiment and the front perspective view of EF controller;
Fig. 3 is the profile of EF joint pipe box part;
Fig. 4 is the profile of another kind of EF joint;
Fig. 5 is the front view of fusible belt; And
Fig. 6 is the front view of another kind of fusible belt.
EF joint that is shown in Fig. 2 and EF controller are used as the embodiment of control thermoplastic articles alloying process automatically, and control its alloying process by the control chart that is shown in Fig. 1.T shape EF joint 1 has three pipe box parts 3, and the end of thermoplastic resin pipe 2 will be coupled together regularly in these parts.The protruding pair of end portions terminal pin 4 of end face from each pipe box part.The EF controller of briefly representing with cross reference number 5 has a built-in CPU (being central processing unit) who is used for controlling automatically alloying process.The control electric wire 7 that is stretched out by controller has a joint 6 and end leads pin 4 close-fittings at its end.The cable 9 of being drawn by controller has one in order to insert the plug 8 of supply socket at its free end.Controller 5 further comprises firing switch 10, shutdown switch 11 and indicator 12.
Can be fixed on separately pipe box part 3 to pipe 2.Each pipe box 3 of EF joint 1 has the inner surface that has embedded independent heating electric wire 13 within it.As shown in Figure 3, the resistor of having mentioned as the front, every heating electric wire 13 are to be made of the heart yearn and the covering of answering with the thermoplastic material identical with EF joint 1.Heating electric wire 13 is bent, form the end of U-shaped and extend the pin of pair of parallel from this end.The lead 13 of bending is coiled, be embedded within the inner surface of pipe box part 3, and make the free end of pin be fixed in end leads pin 4.
Two joints 6 of EF controller 5 and end leads pin 4 close-fittings separately.
When work, the plug 8 of EF controller 5 is inserted supply socket, and the end of pipe 2 is inserted the pipe box part 3 of EF joint 1.After joint 6 is connected to the end leads pin 4 that is stretched out by pipe box part 3, just switch starting 10 EF joint 1 is come into effect the automatic control of alloying process.
As shown in Figure 1, after starting button 10 is connected, just there is an initial signal to deliver to CPU, with the beginning control procedure.Saying more in detail, is exactly the power supply of certain initial intensity heating electric wire 13, makes its temperature be begun to rise by environment temperature T1.CPU continuously detects voltage and current (i.e. ampere) and timing.
First step of autocontrol method is as described below.Arrived in electrical power on any of predetermined level, come the variation coefficient of calculated resistance as electrical characteristics.Then, in one given period, by the regular time interval, continuation is done on-off control to the heating electric wire, thereby (that is, proportional-integral-differential proportional-inte-gral-differential) calculates the specific heat of determining relevant resin by for example so-called PID.In this stage, the resistance coefficient relevant with temperature of heating electric wire and the specific heat of resin will be estimated roughly.In described embodiment, the on-off of heating electric wire has been carried out three times, (more accurate saying because system exists some to postpone, is lower than between the temperature of T3 slightly in the temperature of an a little higher than T2 and the another) lifting repeatedly between T2 and T3 thus of the temperature of described lead.From Fig. 1 as seen, such make-break operation is to begin when the temperature of electric wire 13 rises to T2, and this temperature is enough low, and resin can not melt.(reference marks P1, Δ I1 and Δ T1-Δ T5 represent a peak value, difference and each peak between this highs and lows of electrical power respectively and are connected to time interval between thereafter the minimum point.)
Second step of autocontrol method is as described below.Here, according to specific heat that has recorded in a first step and changes in resistance coefficient, in some stages in succession, improve the electrical power of supplying with the heating electric wire step by step.In this step, the variation coefficient of further calculated resistance in each stage.In each stage,, also make the variation coefficient of specific heat by the heating electric wire is further implemented make-break operation.Thereby the heating electric wire that obtains the in a first step resistance coefficient relevant with temperature and the rough estimated value of resin specific heat judged, see whether they are accurate.If be judged as inaccurately, then these values can be proofreaied and correct in this step.In this step, will set up an only heating condition for resin.In described embodiment, electrical power has been raise four times and reached more and more higher level, and in each stage, carried out make-break operation one time.More detailed saying, the temperature of heating electric wire 13 rises to T4 from T2, then reduces to T5.Then, the control temperature rises to T6 from T5 once more, and temporarily reduces to T7 subsequently.Temperature further rises to T8 from T7 and reduces to T9 again, then rises to T10 and reduces to T11 again.Converge on target temperature T10 more at last.Last stage, that is, the quadravalence section in this example is important for definite only heating condition.Some situations are like this arranged, and they need five stages or more multistage situation as long as a phase I just is enough to set up only heating condition in the alloying process for this purpose yet also have.Preferably incite somebody to action the maximum number in lifting stage repeatedly, for example, be restricted to 10.Power supply is supplied with when in the end a stage (i.e. the 10th stage) finishes and is stopped, and sends warning.In any case the described power supply that increases heating electric wire 13 off and on is effective for preventing that resin is heated to for the temperature that can cause its thermal metamorphism.(symbol P2-P5, Δ I2-Δ I4, and each the expression electrical power among the Δ T6-Δ T8 is in the difference between the difference between the adjacent maximum, a maximum and the next minimum of a value and the time interval between the adjacent minimum of a value.)
The 3rd step of this method is as described below.When the variation coefficient (more precisely say, be meant its inverse in the present invention) of the specific heat that records just in time reaches or becomes littler than predetermined value, just stop to increase the power that provides in second step.On-off control will continue, and when specific heat itself reaches or become littler than predetermined value, just stop to supply with electrical power.In described embodiment, when the power that increases gradually was heated to optimum temperature T10 to electric wire 13, the specific heat variation coefficient will be less than predetermined value.After this, stop to increase power and on-off will continue a period of time and is in its optimum value T10 place with the temperature that keeps heating electric wire 13.In such one operation that reaches balance, when resin temperature trend electric wire temperature, it will be gradually little observing electronic rate difference in one week at make-break operation.The specific heat that this means the resin that is heated by electric wire 13 reduces gradually towards almost nil direction, shows that resin is in fusing.The essential surface portion of resin object will melt by this way, and the power supply supply will be cut off to finish alloying process.
Can change the 3rd step like this,, after after a while, just stop to provide electrical power, and be to be used in the specific heat of combustion that records in second step to calculate during this period of time from on-off control.
Fig. 4 is the profile of EF joint 1a that can use the another kind of type of this method.Generally speaking this joint 1a is a pipe box shape as one, and it has two relative ends to hold the end of the pipe 2a that will be connected in it.Heating electric wire 13a in this situation is such, and it melts the end of electric two tubes simultaneously, to become as a whole with this joint.Electric wire 13a is that helical form is embedded in the bare wire among the joint 1a, it zone line around must be rarer and at end regions around must be closeer.End by the side of joint 1a outwardly directed end leads pin 4a and electric wire 13a joins.The joint 6 same and end leads pin 4a close-fittings of EF controller 5, and electrical power also provides as described above in an identical manner.
Fig. 5 illustrates the fusible belt of being done by thermoplastic resin 14.This belt is by preceding basic unit and the back 15a of basic unit and 15b, and two heating electric wires 16 that are clipped between two-layer constitute.Electric wire 16 crosses belt circuitously and extends in its whole length.In use, take the suitable belt of a segment length, two terminals of the electric wire 16 that stretches out from cutting length one end are connected to each other electric from very long belt.Then this section belt that is cut attached to or otherwise be fixed on the part of thermoplastic articles or those parts that will fuse together on.And cut place, length other end at belt, and making two other terminal of electric wire 16 and joint 6 close-fittings of EF controller 5, for realizing alloying process, then to be encouraged controller.This belt 14 is useful for the thermoplastic articles that any portion within it of fusion does not embed the heating electric wire, and can be used for any surface configuration of described object.In a special applications, for being provided, large-sized solid impervious thin slice comes topped underground dump pit, can adopt several such belts 14, the parallel edges of individual thermoplastic resin thin slice with given width along them fused together.The big thin slice of opening like this can prevent effectively that various harmful substances from penetrating earth.Even owing to the varied length marked change that makes fusible belt 14 of shape and size of described individual sheets, still can be successfully and the autocontrol method that provides here is provided exactly.
Fig. 6 illustrates another kind of fusible belt 14a.This belt comprises the carbon fiber preform as basic unit 17.Be attached to or be fixed on vertical limit of basic unit as a pair of electric wire 18 of negative electrode and anode.The joint 6 that the terminal of electric wire 18 is connected to EF controller 5 is to heat basic unit 17.Also can get the mode identical, promptly melt the mode of basic unit, use this belt 14a with described first kind of belt 14.
In general, the invention provides a kind of method of automatic control alloying process, according to The electrical characteristics of the electric wire that in alloying process, records simultaneously and the physical property of resin, for The electric wire that heating and partial melting resin object are used is set up best condition of work. Like this, With comprising that the object that any type of resin is made can both successfully and exactly fuse together.
In the method that proposes, no longer need to have embedded in the EF joint various electricity here Resistance, it is detected earlier any booster resistor with type under the clear and definite joint. This Sample, producing now the EF joint just can be more economical, and the EF controller connects for it The structure of head also can be simple.
Moreover, once be the negative factor that causes lack of fusion, in prior art Nowadays the shortcoming that has changeable gap between EF joint and the pipe has not existed yet, because In the process of fusion, measure the specific heat of resin, thereby any slit or gap will be no longer not have The mode of method precognition produces injurious effects to alloying process.
Claims (2)
1. a method of controlling the thermoplastic articles alloying process automatically is characterized in that this method comprises the steps:
(1) initial signal that begins in response to the indication alloying process, the electric current supply resistor, this resistor is as the heater that the relatively also mutual closely superficial layer of contact of thermoplastic resin is fused together, when electrical power is increased to predetermined level, the electrical characteristics of calculated resistance device, and, calculate the specific heat of resin by resistor being done on-off control;
(2) in some stages in succession, increase electrical power step by step, and according to the electrical characteristics and the specific heat that in step (1), have recorded, and detect the change in electrical characteristics coefficient in each stage, and resistor is done further on-off control, and detect the variation coefficient of specific heat in per stage; And
(3) last, when the variation coefficient of the specific heat that records reaches or during less than a predetermined value, just stops to increase electrical power, but still continue on-off control, when specific heat itself is equal to or less than a predetermined value, stop to supply with electrical power in step (2).
2. automatic method of control thermoplastic articles alloying process, this method comprises the steps:
(1) initial signal that begins in response to the indication alloying process, the electric current supply resistor, this resistor is as the heater that the relatively also mutual closely superficial layer of contact of thermoplastic resin is fused together, when electrical power is increased to predetermined level, the electrical characteristics of calculated resistance device, and, calculate the specific heat of resin by resistor being done on-off control;
(2) in some stages in succession, increase electrical power step by step, and according to the electrical characteristics and the specific heat that in step (1), have recorded, and detect the change in electrical characteristics coefficient in each stage, and resistor is done further on-off control, and on each grade, detect the variation coefficient of specific heat; And
(3) last, when the variation coefficient of the specific heat that records in step (2) reaches or during less than a predetermined value, just stop to increase electrical power, but still continue on-off and control, up to from the on-off of this step (3) control beginning after after a while, just stop to supply with electrical power, and be to be used in the specific heat of combustion that records in the step (2) to calculate during this period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94116323A CN1057958C (en) | 1994-10-11 | 1994-10-11 | A method of automatically controlling the fusion process between thermoplastic articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94116323A CN1057958C (en) | 1994-10-11 | 1994-10-11 | A method of automatically controlling the fusion process between thermoplastic articles |
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| Publication Number | Publication Date |
|---|---|
| CN1120490A true CN1120490A (en) | 1996-04-17 |
| CN1057958C CN1057958C (en) | 2000-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94116323A Expired - Fee Related CN1057958C (en) | 1994-10-11 | 1994-10-11 | A method of automatically controlling the fusion process between thermoplastic articles |
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| Country | Link |
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| CN (1) | CN1057958C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773950A (en) * | 2016-05-16 | 2016-07-20 | 富通住电特种光缆（天津）有限公司 | Insulating system of optical cable extruding machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4746545A (en) * | 1985-12-16 | 1988-05-24 | Acumeter Laboratories, Inc. | Fluid coating and web-handling method and apparatus particularly adapted for low-tension and/or unevenly thick webs |
| US4684789A (en) * | 1986-04-17 | 1987-08-04 | Central Plastics Company | Thermoplastic fitting electric welding method and apparatus |
| DE3810795C2 (en) * | 1988-03-30 | 1994-04-21 | Huerner Gmbh | Electric welding machine for automatic welding of heating coil fittings |
-
1994
- 1994-10-11 CN CN94116323A patent/CN1057958C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773950A (en) * | 2016-05-16 | 2016-07-20 | 富通住电特种光缆（天津）有限公司 | Insulating system of optical cable extruding machine |
| CN105773950B (en) * | 2016-05-16 | 2018-02-16 | 富通住电特种光缆（天津）有限公司 | Optical cable extruding machine heat-insulation system |
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| Publication number | Publication date |
|---|---|
| CN1057958C (en) | 2000-11-01 |
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