CN113334789A - Electric melting pipe fitting intelligent welding method based on position detection, storage medium and terminal - Google Patents
Electric melting pipe fitting intelligent welding method based on position detection, storage medium and terminal Download PDFInfo
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- CN113334789A CN113334789A CN202110780244.6A CN202110780244A CN113334789A CN 113334789 A CN113334789 A CN 113334789A CN 202110780244 A CN202110780244 A CN 202110780244A CN 113334789 A CN113334789 A CN 113334789A
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- 238000003466 welding Methods 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000002844 melting Methods 0.000 title claims abstract description 34
- 230000008018 melting Effects 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000003860 storage Methods 0.000 title claims abstract description 9
- 238000003780 insertion Methods 0.000 claims abstract description 26
- 230000037431 insertion Effects 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims description 12
- 238000005253 cladding Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 244000241872 Lycium chinense Species 0.000 description 2
- 235000015468 Lycium chinense Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 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
- 239000012943 hotmelt Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention relates to an intelligent electric melting pipe welding method based on position detection, a storage medium and a terminal, comprising the following current monitoring steps: 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 in 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 momentFruit of Chinese wolfberryAnd in combination with R/N and Rmand/N calculating the clearance width of the inserted pipe fitting. The invention is further measured by the temperature and resistance change in the resistance wire welding processThe change of the current is calculated, the resistance of the reserved space width and the insertion depth is measured, the specific values of the reserved space width and the insertion depth are calculated, whether the inserted pipe fitting is inserted in place or not 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 electric melting pipe fitting intelligent welding method based on position detection, a storage medium and a terminal.
Background
When the polyethylene pipelines are connected by adopting electric fusion welding, the quality of the pipeline joint is easily influenced by environmental factors and manual operation factors; generally, two common pipe fittings are inserted into two sides of an electric melting pipe fitting in the welding process, and then the electric melting pipe fitting is subjected to heating cladding through resistance wires on the two sides of the electric melting pipe fitting, so that the purpose of welding the two common pipe fittings is achieved. Resistance wires are arranged in the electric melting pipe fitting only in a distance from two sides, the depth of the electric melting pipe fitting inserted into the electric melting pipe fitting is 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 or too shallow insertion; in order to prevent the depth of the general pipe fittings from being inserted too deep, the diameter of the section of the general electric melting pipe fittings which is not provided with the resistance wires is smaller than the diameter of the pipe fittings which are provided with the resistance wires at the two sides; although the problem that the inserted pipe fitting is inserted too deeply 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 empty can not be prevented, so that the electric melting pipe fitting welding machine is heated unevenly, and the welding quality is influenced.
The existing intelligent welding method for the electric melting pipe fittings mainly utilizes an automatic control technology to monitor the electric melting welding process and then controls the output of a power supply of a welding machine according to a specific welding control strategy, so that the temperature of a resistance wire of the electric melting pipe fittings is kept constant, and the interference of parameter setting and human factors on the quality of the welding machine is eliminated; it does not detect whether the inserted pipe is inserted in place during the welding process and if not, the overall welding quality is affected. Therefore, how to monitor and judge whether the inserted pipe is inserted in place or whether the inserted pipe moves in the welding process is a problem which needs to be solved urgently at the present stage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an intelligent electric melting pipe welding method based on position detection, a storage medium and a terminal, and solves the problem that the existing welding method cannot detect whether an inserted pipe is inserted in place or not and has a blank phenomenon.
The purpose of the invention is realized by the following technical scheme: an intelligent electric melting pipe fitting welding method based on position detection comprises the following steps:
a current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program, and judging the size 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 not within 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 rise of the resistance wire to cause the actual current to be reduced, the fact that the inserted pipe fitting is not inserted into the position at the moment is explained, so that the temperature of the resistance wire is increased because the heat of a section of resistance wire is not contacted with the inserted pipe fitting to transfer heat dissipation;
and (3) detecting a blank position: calculating the total actual resistance R of the resistance wire at the momentFruit of Chinese wolfberryAnd in combination with R/N and Rmand/N, calculating the clearance width of the inserted pipe fitting, and recording corresponding welding parameters and the clearance width parameters.
Further, the intelligent welding method further comprises a parameter setting step before the current monitoring step, which comprises:
setting one end of the electric melting pipe fitting to be provided with N circles of resistance wires and the arrangement width to be L, and further calculating to obtain the cladding width of each circle of resistance wire to be L/N;
measuring the total resistance value of the resistance wire when the magnitude relation between the actual welding current and the standard current meets the requirement, and calculating to obtain the average resistance value of each circle of resistance wire at the moment as R/N;
measuring non-insertion tubeThe total resistance value of the resistance wire under the actual current condition of the welding circuit is RmAnd calculating to obtain the average resistance value of each resistance wire circle at the moment as Rm/N。
Further, the combination of R/N and Rmthe/N calculation of the clearance width of the inserted pipe comprises the following steps:
setting the insertion depth to L1The width of the space is L2Wherein, 0 is less than or equal to L1≤L，0≤L2Not more than L, and L1+L2＝L；
Calculating the insertion depth to be L according to the cladding width of each circle of resistance wire1Number of resistance wire turns occupied
And calculating the resistance of the segment as
Calculating the depth of the space to be L according to the cladding width of each circle of resistance wire2Number of resistance wire turns occupied
And according to said RmCalculating the resistance of the segment as
Simultaneous formula L1+L2L and
solving a linear equation of two elements to obtain the insertion depth L1Value of (d), margin width L2The value of (c).
Further, if the actual welding current is smaller than the standard current or is not within the error range of the standard current in the insertion position judging step, the problem of contact between the welding circuit and the resistance wire is shown.
Further, the requirement that the relation between the measured actual welding current and the standard current meets the requirement comprises that the real-time measured welding current is equal to the standard current or within the error range of the standard current.
Further, the intelligent welding method further comprises the 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 or not is judged according to the acquired external environment temperature.
Further, the intelligent welding method also comprises a welding ending step, wherein the welding ending step comprises the step of automatically turning off a power supply after the standard welding time of the welding machine is controlled through a PID intelligent control algorithm when the magnitude relation between the measured actual current and the standard current meets the requirement.
Further, the step of preheating the electrofused pipe fitting includes:
the welding machine collects the external environment temperature and compares the external environment temperature with a 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 melting pipe fitting is not executed;
and if the external environment temperature is higher than the standard temperature range, reducing the input standard welding time.
A storage medium having stored thereon a computer control program, which when executed by a processor, performs the steps of the method for intelligent position detection based welding of electrofusion 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 as to enable the terminal to execute the steps of the intelligent electric fusion welding pipe welding method based on the position detection.
The invention has the beneficial effects that: the utility model provides an electric smelting pipe fitting intelligence welding method, storage medium and terminal based on position detection, through the change of resistance wire welding in-process temperature and resistance and then calculate the change of electric current, realize keeping somewhere empty width and the resistance of depth of insertion and measure, and then calculate and keep somewhere empty width and the concrete value of depth of insertion, judge whether insert the pipe fitting and insert target in place, avoided because of inserting not target in place and influence the problem of welding quality and pipe fitting life, greatly improved the welding quality and the life of pipe fitting.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, 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 claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection 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 present invention relates to an intelligent welding method for electrofusion pipe fittings based on position detection, where the intelligent welding method includes:
parameter setting step: setting one end of the electric melting pipe fitting to be provided with N circles of resistance wires and the arrangement width to be L, and further calculating to obtain the cladding width of each circle of resistance wire to be L/N;
specifically, assuming that 50 circles of resistance wires with the same size are directly distributed at one end of the electric melting pipe fitting, and the distribution width is 20cm, the cladding width of each circle of resistance wire can be calculated to be 4 mm.
The total resistance value of the resistance wire when the current magnitude relation between the actual current and the maximum output power meets the requirement is measured to be R, the average resistance value of each circle of resistance wire at the moment is obtained by calculation to be R/N, and the total structure R of the resistance wire can be regarded as that the resistance wire is obtained by connecting N small resistors in series (each circle of resistance wire is regarded as an independent small resistor);
furthermore, the relation between the actual welding current and the standard welding current meets the requirement, namely the actual welding current is equal to the standard welding current in the welding procedure or the relation meets the requirement within the error range of the standard welding current, at the moment, the insertion depth of the inserted pipe fitting is just equal to the width of the resistance wire distributed on the electric melting pipe fitting, and the empty phenomenon does not exist; assuming that the maximum output power of the welding machine is 7.5kW, the voltage is 30V and the current is 250A, the formula P is I × U is I2When R is obtained, R/N is 0.0024 Ω when R is 0.12 Ω.
Measuring the total resistance of resistance wire in actual welding current condition without inserting pipe fitting as RmAnd calculating to obtain the average resistance value of each resistance wire circle at the moment as Rmand/N. Assuming that the welder heats the resistance wire with the maximum power when no pipe is inserted, the actual current of the welder circuit is 10kW, measured at the moment, according to the formula Pm＝I2RmAt this time, R is obtainedm0.16 Ω, then Rm/N＝0.0032Ω。
Preheating the electric melting pipe fittings, which specifically comprises the following steps:
the welding machine collects the external environment temperature and compares the external environment temperature with a 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 in the welding program is 100s, the newly input welding time is increased to 120 s;
if the external environment temperature is within the standard temperature range, the step of preheating the electric melting pipe fitting is not executed;
if the external environment temperature is higher than the standard temperature range, reducing the input standard welding time; the re-input welding time is reduced to 80s in this case.
Furthermore, 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 external temperature in the north can reach minus dozens of degrees, and if the electric melting pipe fitting is directly heated at the maximum output power, slight bursting of the interior of the electric melting pipe fitting can be possibly caused; when the external environment temperature is higher than the standard temperature range, such as Hainan or Xinjiang, the maximum temperature of the electric smelting pipe fitting in the daytime can reach four or fifty degrees, the electric smelting pipe fitting per se can be softened relatively under the condition of the standard temperature range, and if the electric smelting pipe fitting is heated at the normal maximum output power time, the electric smelting pipe fitting can be overheated.
A current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program, and judging the size relation between the real-time welding current and the standard current;
the hot-melt 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 welded pipe is 100s, the resistance is increased along with the rise of the temperature in the whole welding process, the change curve of the current in the time from 0s to 100s is regular (namely a standard relation curve under perfect welding), if the welded pipe is not input in place, a section of resistance wire cannot transfer heat to the welded pipe in the welding process to cause too fast temperature rise, the temperature which can be reached by the original 100s is reached in advance, for example, the temperature of the section of resistance wire reaches 100s possibly in 80s, and the actual welding time is still 100s according to the welding program, the temperature of the section of resistance wire in the next 20s will continue to rise, the resistance value of the resistance wire is continuously increased, so that the resistance value of the whole resistance wire is increased, and the current is reduced due to the increase of the resistance because the voltage is constant; therefore, whether the welding pipe is inserted in place or not can be known by monitoring the magnitude relation between the actual current and the standard welding current at certain time points or within certain time periods.
An insertion position judging step: if the actual welding current is smaller than the standard current or not within 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 rise of the resistance wire to cause the actual current to be reduced, the fact that the inserted pipe fitting is not inserted into the position at the moment is explained, so that the temperature of the resistance wire is increased because the heat of a section of resistance wire is not contacted with the inserted pipe fitting to transfer heat dissipation;
and (3) detecting a blank position: calculating the total actual resistance R of the resistance wire at the momentFruit of Chinese wolfberryAnd in combination with R/N and Rmand/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 measured at this time was 8.5kW, according to PFruit of Chinese wolfberry＝I2RFruit of Chinese wolfberryAt this time, R is obtainedFruit of Chinese wolfberry0.136 Ω, then RFruit of Chinese wolfberry/N＝0.00272Ω
Further, the combination of R/N and Rmthe/N calculation of the clearance width of the inserted pipe comprises the following steps:
setting the insertion depth to L1The width of the space is L2Wherein, 0 is less than or equal to L1≤L，0≤L2Not more than L, and L1+L2＝L＝20cm；
Calculating the insertion depth to be L according to the cladding width of each circle of resistance wire1Number of resistance wire turns occupied
And calculating the resistance of the segment as
Calculating the depth of the space to be L according to the cladding width of each circle of resistance wire2Number of resistance wire turns occupied
And according to said RmCalculating the resistance of the segment as
Simultaneous formula L1+L2L and
solving a linear equation of two elements to obtain the insertion depth L1Value of (d), margin width L2A value of (d); namely:
determining the depth of insertion L112cm, leaving a space width L2When the inserted pipe fitting is 8cm, that is, 8cm is not inserted in place, namely, heat generated by 50 circles of resistance wires and 20 circles of resistance wires cannot be transferred because the resistance wires are not in contact with the inserted pipe fitting, and the temperature of the 20 circles of resistance wires is increased.
And a welding finishing step, which comprises automatically turning off the power supply after controlling the welding standard welding time of the welding machine by a PID intelligent control algorithm when the magnitude relation between the measured actual current and the standard current meets the requirement.
Further, if the actual welding current is smaller than the standard current or is not within the error range of the standard current in the insertion position judging step, the problem of contact between the welding circuit and the resistance wire is shown.
Further, the requirement that the magnitude relation between the measured actual current and the standard welding current meets the requirement comprises that the actual current of the welder is measured in real time to be equal to or within the error range of the standard welding current of the welder.
Example 2
Another embodiment of the present invention includes a storage medium having a computer control program stored thereon, which when executed by a processor, implements the steps of a position detection-based intelligent welding method for electrofusion pipes 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 electrofusion tubes based on position detection in embodiment 1 of the present invention.
According to the invention, the resistance of the blank 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, so that the specific values of the blank width and the insertion depth are calculated, whether the inserted pipe fitting is inserted in place or not is judged, and the temperature rise of the resistance wire can be caused by the fact that the heat emitted by the resistance wire can not be transferred because the resistance wire is not in contact with the inserted pipe fitting.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The intelligent welding method of the electric melting pipe fittings based on the position detection is characterized in that: the intelligent welding method comprises the following steps:
a current monitoring step: monitoring an actual relation curve between welding time and welding current in the welding process in real time, comparing and analyzing the actual relation curve with a standard relation curve between standard welding time and standard current in a preset welding program, and judging the size 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 not within 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 rise of the resistance wire to cause the actual current to be reduced, the fact that the inserted pipe fitting is not inserted into the position at the moment is explained, so that the temperature of the resistance wire is increased because the heat of a section of resistance wire is not contacted with the inserted pipe fitting to transfer heat dissipation;
and (3) detecting a blank position: calculating the total actual resistance R of the resistance wire at the momentFruit of Chinese wolfberryAnd in combination with R/N and Rmand/N, calculating the clearance width of the inserted pipe fitting, and recording corresponding welding parameters and the clearance width parameters.
2. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 1, wherein: the intelligent welding method further comprises a parameter setting step before the current monitoring step, which comprises:
setting one end of the electric melting pipe fitting to be provided with N circles of resistance wires and the arrangement width to be L, and further calculating to obtain the cladding width of each circle of resistance wire to be L/N;
measuring the total resistance value of the resistance wire when the magnitude relation between the actual welding current and the standard current meets the requirement, and calculating to obtain the average resistance value of each circle of resistance wire at the moment as R/N;
measuring the total resistance of resistance wire in the actual current condition of welding circuit when no pipe is inserted as RmAnd calculating to obtain the average resistance value of each resistance wire circle at the moment as Rm/N。
3. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 2, characterized in that: the combination of R/N and Rmthe/N calculation of the clearance width of the inserted pipe comprises the following steps:
setting the insertion depth to L1The width of the space is L2Wherein, 0 is less than or equal to L1≤L，0≤L2Not more than L, and L1+L2＝L；
Calculating the insertion depth to be L according to the cladding width of each circle of resistance wire1Number of resistance wire turns occupied
And calculating the resistance of the segment as
Calculating the depth of the space to be L according to the cladding width of each circle of resistance wire2Number of resistance wire turns occupied
And according to said RmCalculating the resistance of the segment as
Simultaneous formula L1+L2L and
solving a linear equation of two elements to obtain the insertion depth L1Value of (d), margin width L2The value of (c).
4. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 1, wherein: and in the step of judging the insertion position, if the actual welding current is smaller than the standard current or not in the error range of the standard current, the problem of contact between the welding circuit and the resistance wire is shown.
5. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 2, characterized in that: the requirement that the relation between the measured actual welding current and the standard current meets the requirement comprises that the real-time measured welding current is equal to the standard current or within the error range of the standard current.
6. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 2, characterized in that: the intelligent welding method further comprises the 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 or not is judged according to the acquired external environment temperature.
7. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 6, characterized in that: the intelligent welding method also comprises a welding finishing step, which comprises the step of automatically turning off the power supply after controlling the welding standard welding time of the welding machine through a PID intelligent control algorithm when the magnitude relation between the measured actual current and the standard current meets the requirement.
8. The intelligent electric smelting pipe welding method based on position detection as claimed in claim 6, characterized in that: the step of preheating the electrofusion pipe fitting comprises:
the welding machine collects the external environment temperature and compares the external environment temperature with a 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 melting pipe fitting is not executed;
and if the external environment temperature is higher than the standard temperature range, reducing the input standard welding time.
9. A storage medium having a computer control program stored thereon, characterized in that: the computer control program when executed by a processor implements the steps of the intelligent electrofusion tube welding method based on position detection of any one of claims 1-8.
10. A terminal, 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 to cause the terminal to perform the steps of the position detection-based intelligent electric fusion welding pipe welding method according to any one of claims 1 to 8.
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| CN113878880A (en) * | 2021-09-14 | 2022-01-04 | 浙江大学 | Intelligent electric melting welding temperature control method and device |
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