CN113334789B - Position detection-based intelligent welding method for electric melting pipe fitting, storage medium and terminal - Google Patents
Position detection-based intelligent welding method for electric melting pipe fitting, storage medium and terminal Download PDFInfo
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- CN113334789B CN113334789B CN202110780244.6A CN202110780244A CN113334789B CN 113334789 B CN113334789 B CN 113334789B CN 202110780244 A CN202110780244 A CN 202110780244A CN 113334789 B CN113334789 B CN 113334789B
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- 238000003466 welding Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000002844 melting Methods 0.000 title claims abstract description 36
- 230000008018 melting Effects 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000003860 storage Methods 0.000 title claims abstract description 9
- 238000003780 insertion Methods 0.000 claims abstract description 24
- 230000037431 insertion Effects 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000005253 cladding Methods 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 7
- 230000004927 fusion Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/82—Testing the joint
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/82—Testing the joint
- B29C65/8269—Testing the joint by the use of electric or magnetic means
- B29C65/8276—Testing the joint by the use of electric or magnetic means by the use of electric means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
- B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
- B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/962—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process using proportional controllers, e.g. PID controllers [proportional–integral–derivative controllers]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Abstract
The invention relates to an intelligent welding method for an electric melting pipe fitting based on position detection, a storage medium and a terminal, comprising the following steps of: monitoring an actual relation curve between welding time and welding current in the welding process in real time, and comparing and analyzing the actual relation curve with a standard relation curve; an insertion position judging step: if the actual welding current is smaller than the standard current or is not within the error range of the standard current, the inserted pipe fitting is not inserted in place at the moment; and (3) detecting a blank position: calculating the total actual resistance R of the resistance wire at the moment Real world And combine R/N and R m and/N, calculating the clearance width of the inserted pipe fitting. According to the invention, the change of current is calculated through the change of temperature and resistance in the welding process of the resistance wire, so that the measurement of the resistance of the clearance width and the insertion depth is realized, the specific values of the clearance width and the insertion depth are calculated, whether the inserted pipe fitting is inserted in place is judged, and the welding quality and the service life of the pipe fitting are greatly improved.
Description
Technical Field
The invention relates to the technical field of electric melting pipe fitting welding, in particular to an intelligent electric melting pipe fitting welding method based on position detection, a storage medium and a terminal.
Background
When the polyethylene pipeline is connected by adopting electric fusion welding, the quality of the pipeline joint is easily influenced by environmental factors and human operation factors; in the welding process, two general pipes are generally inserted into two sides of the electric melting pipe, and then the electric melting pipe is welded by heating resistance wires on two sides of the electric melting pipe, so that the purpose of welding the electric melting pipe with the two general pipes is achieved. The electric melting pipe fitting is provided with resistance wires at a certain distance from two sides, the depth of the electric melting pipe fitting inserted into the electric melting pipe fitting is generally equal to the width of the resistance wires, and the welding quality and the service life of the electric melting pipe fitting can be influenced by too deep insertion or too shallow insertion; in order to prevent the insertion depth of the common pipe fitting from being too deep, the diameter of the section of the common electric melting pipe fitting, which is not provided with the resistance wire, is smaller than the diameter of the pipe fitting with the resistance wires arranged at the two sides; although the problem that the inserted pipe fitting is too deep can be prevented, the phenomenon that the inserted pipe fitting is too shallow or not in place and the electric melting pipe fitting is left blank cannot be prevented, so that the electric melting pipe fitting welder is heated unevenly, and therefore the welding quality is affected.
The existing intelligent welding method for the electric melting pipe fitting mainly utilizes an automatic control technology to monitor the electric melting welding process, and then controls the output of a welding machine power supply according to a specific welding control strategy, so that the temperature of the resistance wire of the electric melting pipe fitting is kept constant, and the parameter setting and the interference of human factors on the quality of the welding machine are eliminated; but it does not detect whether the inserted pipe is inserted in place during welding, which would affect the overall weld quality if not inserted in place. Therefore, how to monitor and judge whether the inserted pipe fitting is inserted in place or whether the inserted pipe fitting moves in the welding process is performed in the welding process, so that the improvement of the welding quality is an urgent problem to be solved at the present stage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an intelligent welding method for an electric melting pipe fitting based on position detection, a storage medium and a terminal, and solves the problem that whether an inserted pipe fitting is inserted in place or not cannot be detected by the existing welding method.
The aim of the invention is achieved by the following technical scheme: an intelligent welding method of an electrofusion pipe fitting based on position detection, the intelligent welding method comprises the following steps:
and a current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, and comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program to judge the magnitude relation between the real-time welding current and the standard current;
an insertion position judging step: if the actual welding current is smaller than the standard current or is not in the error range of the standard current, according to the rule that the resistance value of the resistance wire is increased along with the temperature increase of the resistance wire to cause the actual current to decrease, the fact that the inserted pipe fitting is not inserted in place at the moment is indicated to cause the heat of a section of resistance wire to be increased due to the fact that the heat is not in contact with the inserted pipe fitting to transfer and dissipate heat;
and (3) detecting a blank position: and calculating the total actual resistance R real of the resistance wire at the moment, calculating the clearance width of the inserted pipe fitting by combining R/N and Rm/N, and recording corresponding welding parameters and clearance width parameters.
Further, the intelligent welding method further includes a parameter setting step, before the current monitoring step, including:
setting N circles of resistance wires which are distributed at one end of the electric melting pipe fitting and have the distribution width of L, and further calculating to obtain the cladding width of each circle of resistance wires as L/N;
measuring the total resistance value of the resistance wire when the relation between the actual welding current and the standard current meets the requirement as R, and calculating to obtain the average resistance value of each circle of resistance wire as R/N;
the total resistance value of the resistance wire under the actual current condition of the welding circuit is measured to be R when no pipe fitting is inserted m Calculating to obtain the average resistance value R of each circle of resistance wires m /N。
Further, the binding of R/N and R m Calculating the clearance width of the inserted pipe fitting by N comprises:
setting the insertion depth to L 1 The clearance width is L 2 Wherein 0.ltoreq.L 1 ≤L，0≤L 2 L is less than or equal to L 1 +L 2 ＝L；
Calculating the number of resistance wires occupied when the insertion depth is L1 according to the cladding width of each circle of resistance wiresAnd calculating the resistance of the section as +.>
Calculating the clearance depth as L according to the cladding width of each circle of resistance wire 2 Number of resistance wire turns occupied at that timeAnd according to said R m N calculates the resistance of the segment as +.>
Simultaneous formula L 1 +L 2 =l sumSolving a binary one-time equation to obtain the value of the insertion depth L1 and the clearance width L 2 Is a value of (2).
Further, the magnitude relation between the actual welding current and the standard current is satisfied by real-time measurement, wherein the welding current is equal to the standard current or within an error range of the standard current.
Further, the intelligent welding method further comprises a step of preheating the electric melting pipe fitting according to the external environment temperature, wherein the step is arranged between the current monitoring step and the parameter setting step, and whether the step is executed is judged according to the collected external environment temperature.
Further, the intelligent welding method further comprises a welding ending step, wherein the step comprises automatically turning off the power supply after the standard welding time of the welding machine is controlled by a PID intelligent control algorithm when the relation between the measured actual current and the standard current meets the requirement.
Further, the step of preheating the electrofusion pipe fitting includes:
the welding machine collects the external environment temperature and compares the external environment temperature with the standard temperature range set by the welding machine;
if the external environment temperature is lower than the standard temperature range, the input standard welding time is increased;
if the external environment temperature is within the standard temperature range, the step of preheating the electric smelting pipe fitting is not executed;
if the ambient temperature is higher than the standard temperature range, the input standard welding time is reduced.
A storage medium having stored thereon a computer control program which when executed by a processor implements the steps of the position detection-based intelligent welding method for electric welding tubes.
A terminal comprising a processor and a memory; the memory is used for storing a computer control program; the processor is used for executing the computer control program stored in the memory so that the terminal executes the steps of the intelligent welding method for the electric welding tube based on the position detection.
The beneficial effects of the invention are as follows: according to the intelligent welding method, the storage medium and the terminal of the electric melting pipe fitting based on position detection, the change of current is calculated through the change of temperature and resistance in the welding process of the resistance wire, the measurement of the resistance of the clearance width and the insertion depth is realized, the specific values of the clearance width and the insertion depth are calculated, whether the inserted pipe fitting is inserted in place is judged, the problem that the welding quality and the service life of the pipe fitting are influenced due to the fact that the inserted pipe fitting is not in place is avoided, and the welding quality and the service life of the pipe fitting are greatly improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application. The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an embodiment of the invention relates to an intelligent welding method for an electrofusion pipe fitting based on position detection, which comprises the following steps:
parameter setting: setting N circles of resistance wires which are distributed at one end of the electric melting pipe fitting and have the distribution width of L, and further calculating to obtain the cladding width of each circle of resistance wires as L/N;
specifically, assuming that 50 circles of resistance wires with the same direct size are arranged at one end of the electric melting pipe fitting, and the arrangement width is 20cm, the cladding width of each circle of resistance wire can be calculated to be 4mm.
The total resistance value of the resistance wire when the relation between the actual current and the maximum output power is measured and the current meets the requirement is R, the average resistance value of each circle of resistance wire is calculated to be R/N, and the total resistance value R of the resistance wire can be regarded as being obtained by connecting N small resistors in series (each circle of resistance wire is regarded as an independent small resistor);
further, the relation between the actual welding current and the standard welding current meets the requirement, namely that the actual welding current is equal to the standard welding current in a welding procedure or the standard welding current is within an error range of the standard welding current, and the insertion depth of the inserted pipe fitting is just equal to the width of the resistance wire arranged on the electric melting pipe fitting, so that no blank phenomenon exists; assuming a maximum output power of the welder of 7.5kW, a voltage of 30V, and a current of 250A, then according to the formula p=i×u=i 2 R, when r=0.12Ω is obtained, R/n=0.0024Ω.
Measuring the total resistance value of the resistance wire under the actual current welding condition without inserting the pipe fitting as R m Calculating to obtain the average resistance value R of each circle of resistance wires m N. Assuming that the welder heats the resistance wire at maximum power without the inserted pipe, the actual current of the welder circuit is measured to be 10kW at this time, according to the formula pm=i 2 R m Obtaining R at this time m =0.16Ω, then R m /N＝0.0032Ω。
The preheating step of the electric melting pipe fitting comprises the following steps:
the welding machine collects the external environment temperature and compares the external environment temperature with the standard temperature range set by the welding machine;
if the external environment temperature is lower than the standard temperature range, the input standard welding time is increased; if the standard welding time is 100s in the welding procedure, the re-input welding time is increased to 120s;
if the external environment temperature is within the standard temperature range, the step of preheating the electric smelting pipe fitting is not executed;
if the external environment temperature is higher than the standard temperature range, reducing the input standard welding time; so that the re-input welding time is reduced to 80s.
Further, the standard temperature range of the welding machine is generally set to be 10-35 ℃, when the external environment temperature is lower than the standard temperature range, especially the lowest temperature outside the north can reach several tens of degrees below zero, if the electric melting pipe fitting is directly heated at the maximum output power at the moment, the inside of the electric melting pipe fitting is likely to be slightly burst; when the external environment temperature is higher than the standard temperature range, such as Hainan or Xinjiang, the highest daytime temperature can reach forty fifty degrees, and the fused pipe fitting itself can be softened relatively under the condition of the standard temperature range, and if the fused pipe fitting is heated at the normal maximum output power time, the condition of overheating can exist.
And a current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, and comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program to judge the magnitude relation between the real-time welding current and the standard current;
the thermal fusion welding machine is internally provided with a welding program, the welding program is preset with corresponding welding time (standard welding time) and constant welding voltage, for example, the welding set time (standard welding time) of a welding pipe is 100s, the resistance increases along with the increase of temperature in the whole welding process, the change curve of the current in the period from 0s to 100s is regular (namely, the standard relation curve under perfect welding), but if the welding pipe is not input in place, a section of resistance wire cannot transfer heat to the welding pipe in the welding process, so that the temperature rises too fast, the temperature which can be reached by 100s in advance is reached, for example, the temperature of the section of resistance wire can reach 100s in the period of 80s, the temperature of the section of resistance wire can continuously increase in the next 20s according to the actual welding time of the welding program, the resistance value of the section of resistance wire can continuously increase, the resistance value of the whole resistance wire can be further increased, and the current can decrease due to the constant voltage; thus, by monitoring the magnitude of the actual current versus the standard welding current at certain points in time or for a certain period of time, it is known whether the welded pipe is in place.
An insertion position judging step: if the actual welding current is smaller than the standard current or is not in the error range of the standard current, according to the rule that the resistance value of the resistance wire is increased along with the temperature increase of the resistance wire to cause the actual current to decrease, the fact that the inserted pipe fitting is not inserted in place at the moment is indicated to cause the heat of a section of resistance wire to be increased due to the fact that the heat is not in contact with the inserted pipe fitting to transfer and dissipate heat;
and (3) detecting a blank position: calculating the total actual resistance R real of the resistance wire at the moment, and combining R/N and R m And N, calculating the clearance width of the inserted pipe fitting, and recording corresponding welding parameters and the clearance width parameters. Assuming that the actual current of the welding circuit is measured at this time to be 8.5kW, then according to P Real world ＝I 2 R Real world Obtaining R at this time Real world =0.136 Ω, then R Real world /N＝0.00272Ω。
Further, the binding of R/N and R m Calculating the clearance width of the inserted pipe fitting by N comprises:
setting the insertion depth to L 1 The clearance width is L 2 Wherein 0.ltoreq.L 1 ≤L，0≤L 2 L is less than or equal to L 1 +L 2 ＝L＝20cm；
According to each ofThe fusion width of the ring resistance wire is calculated to be L 1 Number of resistance wire turns occupied at that timeAnd calculating the resistance of the section according to the R/N as
Calculating the clearance depth as L according to the cladding width of each circle of resistance wire 2 Number of resistance wire turns occupied at that timeAnd calculating the resistance of the section according to the Rm/N as
Simultaneous formula L 1 +L 2 =l sumSolving a binary one-time equation to obtain the insertion depth L 1 The value of (1) and the clearance width L 2 Is a value of (2); namely:
obtaining the insertion depth L 1 Leave-on width L =12 cm 2 The heat emitted by the 8cm insert, i.e. 50 turns of the resistive wire and 20 turns of the resistive wire, is not transferred without contact with the insert, resulting in a temperature rise of the 20 turns of the resistive wire.
And the welding ending step comprises the step of automatically turning off the power supply after the welding standard welding time of the welding machine is controlled by a PID intelligent control algorithm when the relation between the measured actual current and the standard current meets the requirement.
Further, the magnitude relation between the measured actual current and the standard welding current meets the requirement that the real-time measurement of the actual current of the welding machine is equal to or within the error range of the standard welding current of the welding machine.
Example 2
Another embodiment of the present invention includes a storage medium having stored thereon a computer control program which, when executed by a processor, implements the steps of a position detection-based intelligent welding method for electric welding tubes in embodiment 1 of the present invention.
Example 3
Yet another embodiment of the present invention encompasses a terminal comprising a processor and a memory; the memory is used for storing a computer control program; the processor is configured to execute the computer control program stored in the memory, so that the terminal executes the steps of the intelligent welding method for the electric welding tube based on position detection in embodiment 1 of the present invention.
According to the invention, the resistance of the clearance width and the insertion depth is measured through the change of the current calculated by the change of the temperature and the resistance in the welding process of the resistance wire, the specific values of the clearance width and the insertion depth are calculated, whether the insertion pipe fitting is inserted in place is judged, and the temperature rise of the number of rings of the resistance wires caused by the fact that the heat emitted by the number of rings of the resistance wires cannot be transmitted due to the fact that the heat is not contacted with the insertion pipe fitting can be accurately calculated.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. The intelligent welding method for the electric melting pipe fitting based on the position detection is characterized by comprising the following steps of: the intelligent welding method comprises the following steps:
and a current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, and comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program to judge the magnitude relation between the real-time welding current and the standard current;
an insertion position judging step: if the actual welding current is smaller than the standard current or is not in the error range of the standard current, according to the rule that the resistance value of the resistance wire is increased along with the temperature increase of the resistance wire to cause the actual current to decrease, the fact that the inserted pipe fitting is not inserted in place at the moment is indicated to cause the heat of a section of resistance wire to be increased due to the fact that the heat is not in contact with the inserted pipe fitting to transfer and dissipate heat;
and (3) detecting a blank position: calculating the total actual resistance R of the resistance wire at the moment Real world And combine R/N and R m N, calculating the clearance width of the inserted pipe fitting, and recording corresponding welding parameters and the clearance width parameters;
the intelligent welding method further includes a parameter setting step, prior to the current monitoring step, that includes:
setting N circles of resistance wires which are distributed at one end of the electric melting pipe fitting and have the distribution width of L, and further calculating to obtain the cladding width of each circle of resistance wires as L/N;
measuring the total resistance value of the resistance wire when the relation between the actual welding current and the standard current meets the requirement as R, and calculating to obtain the average resistance value of each circle of resistance wire as R/N;
the total resistance value of the resistance wire under the actual current condition of the welding circuit is measured to be R when no pipe fitting is inserted m Calculating to obtain the average resistance value R of each circle of resistance wires m /N；
The combination of R/N and R m Calculating the clearance width of the inserted pipe fitting by N comprises:
setting the insertion depth to L 1 And a clearance width of L 2 Wherein 0.ltoreq.L 1 ≤L，0≤L 2 L is less than or equal to L 1 +L 2 ＝L；
Calculating according to the cladding width of each circle of resistance wireInsertion depth L 1 Number of resistance wire turns occupied at that timeAnd calculating the resistance of the section as +.>
Calculating the clearance depth as L according to the cladding width of each circle of resistance wire 2 Number of resistance wire turns occupied at that timeAnd according to said R m N calculates the resistance of the segment as +.>
Simultaneous formula L 1 +L 2 =l sumSolving a binary one-time equation to obtain the insertion depth L 1 The value of (1) and the clearance width L 2 Is a value of (2).
2. The position detection-based intelligent welding method for electric melting pipe fittings, as set forth in claim 1, is characterized in that: the magnitude relation between the actual welding current and the standard current is satisfied by real-time measurement, wherein the real-time measurement comprises that the welding current is equal to the standard current or within an error range of the standard current.
3. The position detection-based intelligent welding method for electric melting pipe fittings, as set forth in claim 1, is characterized in that: the intelligent welding method further comprises a step of preheating the electric melting pipe fitting according to the external environment temperature, wherein the step is arranged between the current monitoring step and the parameter setting step, and whether the step is executed is judged according to the collected external environment temperature.
4. The position detection-based intelligent welding method for electric melting pipe fittings, as set forth in claim 3, characterized in that: the intelligent welding method further comprises a welding ending step, wherein the step comprises the step of automatically turning off the power supply after the standard welding time of the welding machine is controlled by a PID intelligent control algorithm when the relation between the measured actual current and the standard current meets the requirement.
5. The position detection-based intelligent welding method for electric melting pipe fittings, as set forth in claim 3, characterized in that: the step of preheating the electrofusion pipe fitting comprises the following steps:
the welding machine collects the external environment temperature and compares the external environment temperature with the standard temperature range set by the welding machine;
if the external environment temperature is lower than the standard temperature range, the input standard welding time is increased;
if the external environment temperature is within the standard temperature range, the step of preheating the electric smelting pipe fitting is not executed;
if the ambient temperature is higher than the standard temperature range, the input standard welding time is reduced.
6. A storage medium having stored thereon a computer control program, characterized in that: the computer control program when executed by a processor realizes the steps of the intelligent welding method for the electric welding pipe based on the position detection as set forth in any one of claims 1 to 5.
7. Terminal, its characterized in that: comprises a processor and a memory; the memory is used for storing a computer control program; the processor is configured to execute the computer control program stored in the memory, so that the terminal performs the steps of the intelligent welding method for the electric welding pipe based on the position detection according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110780244.6A CN113334789B (en) | 2021-07-09 | 2021-07-09 | Position detection-based intelligent welding method for electric melting pipe fitting, storage medium and terminal |
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| CN1142796A (en) * | 1993-12-15 | 1997-02-12 | 特殊工业株式会社 | Electrofusion fastening apparatus |
| CN109910317A (en) * | 2019-01-31 | 2019-06-21 | 浙江大学 | It is a kind of it is accurate control electric fusion welding during electric melting pipe fittings weldingvoltage method |
| CN110789133A (en) * | 2019-10-17 | 2020-02-14 | 浙江大学 | Melting zone control method based on real-time temperature field data of electric melting joint |
| CN113075944A (en) * | 2021-03-16 | 2021-07-06 | 中国计量大学 | Temperature control implementation method based on optimization of electric melting temperature characteristic of PE electric melting pipe fitting |
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| CN1142796A (en) * | 1993-12-15 | 1997-02-12 | 特殊工业株式会社 | Electrofusion fastening apparatus |
| CN109910317A (en) * | 2019-01-31 | 2019-06-21 | 浙江大学 | It is a kind of it is accurate control electric fusion welding during electric melting pipe fittings weldingvoltage method |
| CN110789133A (en) * | 2019-10-17 | 2020-02-14 | 浙江大学 | Melting zone control method based on real-time temperature field data of electric melting joint |
| CN113075944A (en) * | 2021-03-16 | 2021-07-06 | 中国计量大学 | Temperature control implementation method based on optimization of electric melting temperature characteristic of PE electric melting pipe fitting |
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| 聚乙烯管道电熔焊接接头承插不到位的检测分析;梁玉梅;谢宝坤;王彦启;;无损探伤(第04期) * |
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