KR0130947B1 - Auto-welding apparatus for plastic pipe - Google Patents

Abstract

An automatic welding machine is composed of a body(10) that includes the sensor which detects the moving distance of the clamp moved by clamping a couple of pipes(5), a hydraulic equipment(20) which shifts the clamp, a pipe plane(40) and a heater(30) that heats both ends of the pipe, and a control device(50) which sets up the welding parameters such as temperature or pressure according to the surrounding temperature and the quality of material or thickness of the pipe automatically and then controls, directs, and records the welding process of the pipe according to the established parameters. And also, the control device is composed of a key input unit(52) for data input, a speaker(56) which transmits the progress of working process as a voice, also transmits an error cause and a correction demand in case of detecting an error, a LCD display unit(54) which displays the established parameters or errors, a printer(58) which outputs the result of welding, a modem(59) for directing the welding process from a remote place, and a welding process controlling division(60) which controls, directs, and detects the general progress of working process.

Description

Plastic Pipe Welding Machine

1 is a flow chart showing a general plastic pipe fusion process,

2A to 2D are schematic diagrams showing the configuration of a conventional manual welding device,

Figure 3 is a block diagram showing a plastic pipe automatic fusion apparatus according to the present invention.

4 is an external view showing the front surface of the control panel of the welding apparatus according to the present invention,

5 is an embodiment of the fusion process control apparatus shown in FIG.

FIG. 6 is a diagram showing the software structure of the apparatus shown in FIG.

7 is a graph showing the fusion cycle according to the present invention,

8 is an operation flowchart of the automatic plastic pipe welding device according to the present invention,

9 is a graph showing the variation of the general traction pressure,

10 is a graph showing the relationship between the thickness of a common pipe and the degree of heating.

The present invention relates to a plastic pipe welding machine for melting and connecting plastic pipes, and in particular, the parameters of the welding process automatically according to the ambient temperature of the working environment and the type (pipe, diameter, thickness, etc.) of the working environment. The present invention relates to a plastic pipe automatic welding device having a function of setting (temperature, pressure, time, etc.) and monitoring the progress of the welding process.

Recently, the demand for plastic pipes is increasing due to the increasing use of city gas and the pollution of water caused by steel pipes. Such plastic pipes are used as city gas pipes, transport pipes for various chemicals, drainage pipes, and the like. Fusion of these plastic pipes is called welding, and such a device is called a welding machine. In other words, welding refers to fusion in the molten state by fusing the base material itself, and is distinguished from general welding using other materials in that the base material is directly melt-bonded without using the other material. Such welding methods include socket welding, butt welding, saddle welding, and the like. Butt fusion is melting and joining the end surface of a pipe | tube, a heater is inserted between the both ends of a pipe, and the end surface is crimped and joined in a molten state.

1 is a flow chart showing a general fusion process.

Typical plastic pipe fusion process is a preparatory process (310) to clamp the pipe for connection and set the welding parameters (temperature, pressure, time, etc.) and then chamfer the connection portion, the pipe connection portion according to the welding conditions Pressurized melting process 320 heating the road and applying a predetermined pressure, heating maintaining process 330 to remove the pressure and heating for a predetermined time, heater removal process 340 for quickly removing the heater for connection after heating, the connection part Welding process to check the welding result by welding the crimping process 350 to squeeze and join the end faces of both pipes in the molten state, the cooling process 360 to cool the joined pipe gradually, and the connection part of the fused pipe. Process 370 is made. In these welding processes, the entire time from press melting to cooling is called a welding time, and the pressing time to cooling is called a joining time. In this fusion process, temperature, pressure, and time are referred to as the three elements (parameters) of the fusion splicing and are very important parameters for determining the quality of the fusion. Therefore, it is necessary to set these parameters according to the type of pipe and the welding environment.

2A to 2D are schematic diagrams showing the configuration of a conventional manual welding machine.

Figure 2a shows a body BODY 10 ', where 10'-1 represents a clamp, 10'-2 represents a cylinder, and 10'-4 represents a hydraulic plug.

Figure 2b shows a hydraulic press 20 ', 20'-1 is a manual regulator to adjust the pressure, 20'-2 is a switch for applying or breaking the hydraulic pressure, the hydraulic connecting line (20'-3) Apply hydraulic pressure to the clamp (10'-1) through. FIG. 2C shows heater 30 ', where 30'-1 represents a temperature controller and 30'-2 represents a hot plate. 2d shows a chamfer 40 ', where 40'-1 represents a drive motor and 40'-2 represents a rotating plate having a blade.

That is, in FIGS. 1 and 2a to 2d, the fusion process is performed by a conventional manual fusion device as follows. In the preparatory process 310, first, in a pair of pipes to be joined, one is tightly clamped by a fixed clamp 10'-1, and the other is connected to the cylinder 10'-2 along the shaft by hydraulic pressure. Tighten to clamp 10'-1 moving left and right. Then, insert the chamfering machine (40 ') with a blade into the connection part of the pipe, chamfer the connection part, and then wipe the inside and the outside with a cleaning agent to clean the connection part, and check the alignment by aligning the connection parts. do. After chamfering, open the clamp 10'-1 (move to the left), insert the heater 30 ', and manually adjust the temperature according to the welding table.

After the preparatory work 310 is finished, the clamp 10'-1 is advanced in the pressure melting process 320, and the connection part of the onion pipe is brought into close contact with the heater 30 'at a predetermined pressure to bead around the tube. Heat at a predetermined pressure and time in accordance with the welding table until) appears. Subsequently, in the heating and holding step 330, the pressure is removed and the heating is performed for a predetermined time according to the welding table. When the heating and holding step 330 is finished, the clamp 10'-1 is moved backwards, and the worker quickly removes the heater 30 '(heater removing step; 340). Thus, after removing the heater 30 ', a predetermined pressure is applied, and the clamp 10'-1 is advanced again to join the molten surface of the pipe (adhering step 350). After cooling for a predetermined time to cool the connection portion (cooling step; 360). When the cooling process 360 is completed and the joining of the pipe is completed, the joint is inspected to see if the joining is complete.

(Fusion state inspection process; 370).

Thus, the conventional manual welding machine has set the parameters manually by the operator by looking at the welding table, so welding is difficult according to the designated welding guide, and the quality is not uniform. There was a case. In order to solve this problem, an automatic fusion device has been developed and used, but only by setting parameters according to the diameter and type of the pipe, there is a problem in that it is not possible to accurately correct the deviation due to the difference in ambient temperature in the working environment. Accordingly, an object of the present invention is to provide an automatic fusion apparatus capable of automatically calibrating according to the ambient temperature of the working environment in order to solve the above problems, and instructing and recording the plastic pipe fusion work process according to the corrected parameters. It is.

In order to achieve the above object, the apparatus of the present invention is a plastic pipe ruler fusion apparatus for melting and joining a plastic pipe according to a reference value of a fusion parameter that is automatically set according to the material, thickness and diameter of the plastic pipe. A body for clamping the plastic pipe, transferring the plastic pipe with a predetermined hydraulic pressure, and sensing a transport distance to output a distance signal; Hydraulic device for generating a pressure in accordance with the hydraulic control signal to apply a predetermined pressure to the body and sensing the hydraulic pressure to output a hydraulic signal; A chamfering device for chamfering both ends of the plastic pipe according to a chamfering control signal and sensing an operation to output an operation signal; A heater for heating both ends of the plastic pipe to a predetermined temperature according to a temperature control signal and sensing a temperature to output a heater temperature signal; Automatically correcting the reference value of the set fusion parameter according to the ambient temperature, and inputting the heater temperature signal, the operation signal, the hydraulic signal and the distance signal to output the control signals according to the corrected reference value of the fusion parameter And a fusion process control device for controlling, instructing and recording the fusion process.

Next, the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing an automatic fusion apparatus according to the present invention.

The automatic welding device according to the present invention clamps a pair of pipes (5) for connection to the body (10) including a clamp to move according to the hydraulic pressure and the distance sensor for detecting the movement distance of the clamp, and clamp the predetermined pressure Hydraulic apparatus 20 for moving to the surface, Chamfer 40 for chamfering both ends of the pipe 5, Heater 30 for heating both ends of the pipe, Fusion parameters (temperature, pressure, time, etc.) ) Is automatically set according to the ambient temperature and the material, thickness, and diameter of the pipe, and the fusion process control device 50 controls, instructs, and records the fusion process of the pipe according to the set parameters. In addition, the fusion process control device 50 is a key input device 52 for setting the type (material, material, thickness, diameter) of the pipe or input data, and instructs the progress of the work process by voice and When the error is detected, a speaker 56 for informing the cause of the error and a request for correction, an LCD display 54 for instructing the work process progress or displaying a set parameter and informing the user of the error, and a printer for printing the fusion result (58), a modem (59) for controlling the fusion process at a remote location, the welding parameters are automatically set according to the type of pipe and the ambient temperature, and the heating temperature signal (SH) and the chamfering operation signal (SO) ), A fusion process control unit 60 for inputting the hydraulic signal SP, the distance signal SD and the head temperature signal SC to control, instruct and monitor the process progress.

Hydraulic apparatus 20 according to the present invention is provided with a micro-pressure control circuit of the hydraulic pump to be able to adjust the hydraulic pressure coming out of the hydraulic pump by an electrical signal to the specified pressure geared to the fusion process control unit 60 according to the pipe type Automatically adjust the pressure to achieve fusion. In other words, when hydraulic pressure is applied to the main valve, when a constant pressure is applied to the control valve, the piston is converted into an electric signal to operate the piston. This piston force is applied to the main valve via a spring and controls the input pressure.

In addition, the chamfer 40 according to the present invention is similar to the conventional chamfer, but the function for monitoring the performance of the chamfering process has been enhanced. That is, in general, workers often omit chamfering work intentionally or accidentally in the work site, in the present invention, the current sensor is inserted into the chamfering machine 40, the hydraulic change in the chamfering process and the distance chamfered pipe Accurately detect whether the chamfering process is performed. In addition, the heater 30 according to the present invention is provided with a temperature sensor to detect the temperature of the hot plate to control to maintain the set temperature accurately.

On the other hand, the device of the present invention is provided with a temperature sensor for sensing the ambient temperature to set the optimal fusion parameters according to the ambient temperature. That is, the heater temperature, the heating holding time, the heater removing time, the pressing time, and the cooling time set according to the type of pipe are automatically corrected according to the change of the ambient temperature. This is because the temperature of the pipe to be fused also changes depending on the ambient temperature, and if this is not taken into account, the fusion quality may be deteriorated. Therefore, if the ambient temperature is high, the avalanche time is set long, the heating holding time is set short, and if the ambient temperature is low, the heat loss is calculated and set in reverse.

In addition, the printer 58 is built in the fusion machine to output the result immediately after fusion so as to determine whether the welding is successful. That is, the conventional fusion machine is not equipped with a printer, and the welding result is output by connecting the printer separately using the connection connector. However, in the present invention, the fusion process control unit 60, the modem 59, the printer 58, and the key input are used. The device 52, the speaker 56, the LCD display 54, and the hydraulic device 20 are configured in one set to facilitate control and use.

In addition, looking at the method of calculating the heater temperature according to the pipe thickness, the temperature of the heater plate (hot plate) for heating the pipe when the plastic pipe is fused should not always be constant, the heating temperature should be adjusted according to the thickness of each pipe. The reason is that when the thickness is thick, the heating time is long. At this time, when the heater temperature is high, the pipe material is changed, so it is difficult to expect perfect results when welding. That is, in the related art, since a constant temperature is adopted regardless of the thickness of the pipe, bubbles are generated at the welded part (change in physical properties of the pipe), such as perfect welding. A graph showing the correlation between the pipe thickness and the heating temperature is shown in FIG. Referring to FIG. 10, the transverse side represents the thickness of the pipe and the vertical axis represents the heating temperature. And the correlation between the thickness (t) of the pipe and the heating temperature (h) is shown in the following equation.

On the other hand, in the preparation process for pipe welding, both surfaces of the pipe are trimmed with a surface cutter to remove foreign substances and align the alignment, which is very important in welding. In spite of the importance of this process, however, many workers have neglected or omitted it because it was cumbersome in some cases. Therefore, in the apparatus of the present invention, 1. A circuit for detecting a change in power according to a load of a motor is used, 2. A change in hydraulic pressure is detected, and 3. A pipe chamfering distance is calculated to determine the conditions 1,2,3. The chamfering work is considered to be performed only if it is satisfied at the same time, and if any condition is not satisfied, the welding result is treated as defective.

In addition, it has a monitor function to grasp the operation and status of equipment by using a telephone line at a long distance by using a modem.In case of an abnormality of equipment and when software change is needed, it is possible to use the telephone line without going to the A / S center. You can check the operating status of the equipment.

In addition, the body is equipped with a distance sensor that detects the moving distance of the clamped pipe to sense the chamfering distance when chamfering, to distinguish the inserted device by recognizing the thickness and heater thickness of the chamfering machine and to sense the distance to melt when forming the bead Allows you to calculate the height of the beads.

4 is an external view showing a control panel of the automatic welding device according to the present invention. In FIG. 4, '+' (SW1) and '-' (SW2) are switches for operating / stopping the chamfer 40, 'START' (SW4) are switches for opening and closing the clamp, and 'ENTER' (SW5) is a key for step selection.

5 is one embodiment of the fusion process control apparatus shown in FIG. In FIG. 5, the fusion process control unit 60 includes a central processing unit (CPU) 62, a system ROM 64, and a system connected via a control bus CB, a data bus DB, and an address bus AB. RAM 66, font ROM 68, power reset unit 70, timing generator 72, decoder 74, clock generator 76, LCD interface 78, input / output interface 80, A / D converter 82, voice synthesizer 84 and RS232C driver 86 are provided to modem 59, printer 58, speaker 56, key input device 52 and LCD 54. Input and output

That is, the heater temperature signal Sh from the temperature sensor of the heater 30, the hydraulic signal Sp from the hydraulic sensor of the hydraulic device 20, the chamfer operation signal So from the current sensor of the chamfer 40, external The ambient temperature signal Sc of the workplace and the distance signal So from the distance sensor of the body 10 are input from the exposed temperature sensor to A / D conversion to detect the operation state of the welding machine, and the heater control signal Ch The hydraulic device control signal Cp and the chamfering control signal Co are respectively output to control the operation of the heater 30, the hydraulic device 20, and the chamfering 40 according to the set parameters. In addition, the fusion process work is displayed on the LCD 54 to instruct the work, or the voice synthesizer 84 instructs the work to be spoken by the speaker 56. Therefore, even an inexperienced worker can easily perform the work as the apparatus of the present invention instructs.

6 is a diagram showing the structure of software executed in the apparatus of FIG. In FIG. 6, '610' inputs the material, thickness, diameter and ambient temperature of the pipe. In '620', the input data and the database contents of the data ROM 64-1 are combined and analyzed. Set the reference value for the fusion parameters (temperature, pressure, time) in. Such '610', '620', and '630' form an input unit.

In '640', it operates according to the reference value setting. That is, it controls the heater temperature, operates the oil pressure, monitors the operation of the chamfering machine, detects the change in the ambient temperature, and controls the operation of the welding machine according to the welding condition.

In 650, the reference value is compared with the actual operating pressure, time, temperature, etc., and in 660, the correction is made when the actual value is outside the allowable value. '640'. '650' and '660' form an execution part.

In '670', the time, temperature, and pressure during the operation of the fusion machine are recorded and compared with the reference value. In '680', the analysis results are stored. In '690', the voice data ROM 64-2 is stored according to the stored analysis results. Using the data, the data is used to direct the speaker to work, to request error correction, or to indicate the cause of the error. In addition, the LCD display device displays the job's instructions, analysis results, and the like, and prints the analysis results through a printer. '670', '680' and '690' form the analysis storage unit.

7 is a graph showing a welding cycle according to the present invention. In Fig. 7, the axis of rotation represents the passage of time t, and the axis of ordinate represents the pressure p. As shown in the graph, in the pressure melting time, the pressure is rapidly removed and then heated to a predetermined heating holding pressure Ph. After the heater is removed at the heater removal time, the connection part of the pipe is joined while rising to a predetermined pressure in the molten state by the crimping time. When the bonding is completed, the pressure is kept constant and cooled for a predetermined time. The total time required for the fusion cycle is called the fusion time, and the sum of the compression time and the cooling time is called the joining time. However, in performing the fusion process, the temperature, pressure and time should be set differently according to the ambient temperature and the type of pipe. Table 1 shows an example of the fusion parameters according to the present invention.

In the above Table 1, for example, if the thickness of the pipe is 10 mm, the bead height is 1.0 mm, and the heating holding time is between 70 and 120 seconds while maintaining the pressure at 0.02 N / mm or less. The heater removal time is about 5 to 6 seconds, the initial compression time is about 5 to 6 seconds, and the cooling time is about 6 to 10 minutes while maintaining the pressure at 0.15 N / mm 2 ± 0.01.

8 is an operation flowchart of the automatic fusion machine according to the present invention. In FIG. 8, in the initial parameter setting step 110, when the pipe outer diameter, the pipe thickness, the pipe material, the printing status, and the like are selected, the optimal fusion parameters are set by the built-in table. That is, the device according to the present invention detects the temperature of the work site and is automatically set according to the welding condition considering this, so that more perfect welding is possible than working according to the table based on 20'c as in the conventional manual method. Do. After the parameter setting is completed, a plurality of welding operations can be distinguished by inputting a work number and a welding number (120). When the job number input is complete, the operator is informed by LCD and / or speaker to clamp the pipe (130). The operator tightens the pipe for welding to the clamp as instructed. When the clamping is completed, the traction pressure is measured and used as data for numerical control (140). The change in the traction pressure is shown in FIG. Referring to FIG. 9, it can be seen that the abscissa represents the passage of time and the ordinate represents the pressure, which peaks at the pressure p1 at the time t1 just before the pipe moves, and drops to the traction pressure p2 as the pipe moves. In the present invention, it is possible to accurately measure the traction pressure at this time. The operator is then informed to the LCD and / or speaker to insert the chamfer (150). Then, when the operator removes the chamfering from the chamfering operation stage 170, by advancing the pipe visually inspect the alignment and clean state (190). If the chamfering test result is not good, repeat from step 150, and if it is good, insert the hot plate, and informs the operator with the LCD and / or speaker (200). When the operator inserts the hot plate, the temperature and pressure conditions are displayed (210), and the clamp is moved to the heater side at a predetermined pressure and melted under pressure (2200. After the pressure melting step is completed, the pressure is removed and the heating is maintained for a predetermined time ( 230) When the heating maintenance step is finished, remove the hotplate and inform the operator with the LCD and / or the loudspeaker 240. When the worker removes the hotplate, it is crimped during the bead generation time and bonded to create a bead (250). When the end of the compression is cooled for a predetermined time (260), when the cooling is complete, check the welding result (270). If the operator checks the welding result is good, depending on the printer setting state or ends immediately (280,290) If it is defective, take steps to repeat the process.

As described above, according to the present invention, it is possible to improve the welding quality by accurately setting the reference value of the welding parameter in consideration of the ambient temperature during the plastic pipe welding operation. Make it work. Therefore, even an inexperienced person can use the apparatus according to the present invention, thereby reducing labor costs.

Claims (6)

Plastic pipe that melts and joins plastic pipes according to the standard value of welding parameter automatically set according to material, thickness and diameter of plastic pipe An automatic welding device comprising: a body (BODY) for clamping a plastic pipe for the connection, transferring the plastic pipe with a predetermined hydraulic pressure, and sensing a transport distance to output a distance signal; Hydraulic device for generating a pressure in accordance with the hydraulic control signal to apply a predetermined pressure to the body and sensing the hydraulic pressure to output a hydraulic signal; A chamfering device for chamfering both ends of the plastic pipe according to a chamfering control signal and sensing an operation to output an operation signal; A heater for heating both ends of the plastic pipe to a predetermined temperature according to a temperature control signal and sensing a temperature to output a heater temperature signal; Automatically correcting the reference value of the set fusion parameter according to the ambient temperature, and inputting the heater temperature signal, the operation signal, the hydraulic signal and the distance signal to output the control signals according to the corrected reference value of the fusion parameter A plastic pipe automatic fusion device comprising a fusion process control device for controlling, directing and recording a fusion process. The apparatus of claim 1, wherein the automatic fusion device is further provided with a modem so as to change software or monitor operation at a remote location. The apparatus of claim 1, wherein the fusion process control device comprises a voice synthesizer to notify a work instruction of the fusion process and an error of the work through voice. The apparatus of claim 1, wherein the fusion process control device inputs an operation signal from the chamfering machine, detects a hydraulic change during chamfering operation, calculates chamfering distances according to the distance signal, and detects whether the chamfering process is performed. Automatic plastic pipe fusion device characterized in that. The apparatus of claim 1, wherein the fusion process control device automatically sets a reference value of the fusion parameter in consideration of the ambient temperature by executing a built-in software according to the operation of the key input device and the key input device. The heater, the hydraulic device, and the chamfering machine according to the reference value of the fusion parameter set by inputting the temperature signal, the hydraulic signal from the hydraulic sensor of the hydraulic device, the operation signal from the current sensor of the chamfering machine, and the distance signal from the distance sensor of the body. A fusion process control unit for controlling the operation of the fusion device, and outputting and storing the fusion device instruction and its operation result in text and voice, a speaker for transmitting the fusion operation instruction and result by voice, and displaying the fusion operation instruction and result in text. And a printer for printing the result of the welding process. Automatic welding device of plastic pipe A plastic pipe automatic fusion device comprising a hydraulic device, a heater, a body, and a chamfering machine for melting and joining both ends of a plastic pipe according to a reference value of a fusion parameter automatically set according to the material, thickness, and diameter of the plastic pipe. Located in, the temperature sensor for sensing the temperature of the heater to output a heater temperature signal; A hydraulic sensor located in the hydraulic device and configured to sense a hydraulic pressure to generate a hydraulic signal; A current sensor which is located in the chamfering machine and senses the chamfering operation current and outputs an operation signal; Located in the body, the distance sensor for sensing the transport distance of the pipe to output a distance signal; An ambient temperature sensor for detecting an ambient temperature of the workplace; And automatically correcting the reference value of the set fusion parameter according to the ambient temperature, and inputting the heater temperature signal, the hydraulic signal, the operation signal, and the distance signal according to the corrected reference value. And a fusion process control means for controlling the operation of the odor and outputting instructions and operation results of the fusion operation by text and voice.