KR20010047858A - Automatic welding device and method for controlling the same - Google Patents

Abstract

PURPOSE: An automatic welding apparatus and a method for controlling the same are provided to prevent an error generated in measuring pulling capacity by obtaining pulling capacity with measuring pressure change until regular distance, thereby increasing the reliability of a welding process. CONSTITUTION: An automatic welding apparatus includes a body part(110) having a clamp(111) clamping a fixed plastic pipe and a conveyance plastic pipe, a cylinder(112) conveying the conveyance plastic pipe to the fixed plastic pipe with predetermined oil pressure, and a distance measuring part(114) sensing the conveyed distance of the plastic pipe; a hydraulic apparatus applying predetermined pressure to the cylinder and having linear comparison characteristic of hydraulic pressure and time according to the quality of the plastic pipes; a chamfering element(130) chamfering both ends of the plastic pipes and having a chamfering blade(132) having predetermined angle from the center axis to the outside; a heating apparatus(140) heating both ends of the plastic pipe at the settled temperature band, and a compensation circuit(144) sensing the temperature for preventing overheat; and a welding control apparatus(100) controlling the operation of the hydraulic apparatus, the chamfering element, and the heating apparatus to melt and unite the plastic pipes in response to the preliminarily set welding parameter and a welding operation signal, storing the result, and checking the inferiority of a welding work process according to the signal outputted from the distance measuring part.

Description

Automatic welding device and method for controlling the same}

The present invention relates to an automatic fusion device for plastic pipes, and in particular, an automatic fusion device and its control capable of achieving the accuracy of the welding process by measuring the traction force value from the distance to the pressure when the traction force is measured and using this value in the fusion parameter. It is about a method.

Generally, plastic pipes are used for various purposes because they have no advantage of corrosion and have the advantages of being semi-permanent and low in material cost and construction cost unless they are artificially damaged. In addition, because of its flexibility, it is easy to pipe on any terrain, and there is no substance dissolving in the pipe itself, so it is mainly used for water pipes, gas pipes, sewer pipes, etc. Wide range of applications

However, in order to safely transport and store materials such as gases or chemicals, which are dangerous substances when installing plastic pipes, the joints of pipes must be firmly joined.

To this end, the joining of the plastic pipes is performed by directly fusion of the plastics themselves with heat without using other materials to join the pipes, which is called welding.

The welding method is divided into butt welding, socket welding and saddle welding. Among them, butt fusion is melting the end face of the pipe and joining it to each other.A heating device (for example, a heater) is inserted between the pipe pipes to melt the end faces and remove the hot plate, and then remove the pipes from both ends of the thermoplastic pipe. It is a technique of pressing and joining.

1 is a functional block diagram of a conventional automatic welding device for plastic pipes, the automatic welding device of the butt fusion method is a parameter input to the temperature, pressure, and time corresponding to the three elements of the welding is input to the welding machine The welding operation is automatically performed according to the welding parameters according to the instructions. Such a butt fusion type automatic welding device is described in Korean Patent Registration No. 130947.

Then, briefly explaining the configuration of the automatic welding device, the clamp 21 for clamping the plastic pipe, the cylinder 22 for transporting the plastic pipe with a predetermined hydraulic pressure, the distance measuring unit 24 for detecting the transport distance of the plastic pipe To apply a predetermined pressure to the cylinder (22), the chamfer (30) chamfering both ends of the plastic pipe, the heating device (40) for heating both ends of the plastic pipe, and the cylinder (22). Hydraulic device 50, and the chamfer 30, the heating device 40 and the hydraulic device 50 so that the plastic pipe is melted / bonded to each other in response to the set fusion parameter and the signal output from the distance measuring unit 24 It is composed of a fusion control device 10 for controlling the operation of the and stores the result.

Further, the automatic welding device includes a selection key input unit 12 for inputting a welding operation environment and a welding operation command, a liquid crystal display 13 for displaying a welding operation menu, a welding operation process, and a result thereof, and applying power to the system. The power switch 14 and the printer 16 for outputting the data of the fusion process, but is integrally mounted to the fusion control device (10).

2 is a circuit diagram of a hydraulic device of a conventional automatic welding device, referring to the conventional hydraulic device 50 is a tank 58 for storing a fluid, a hydraulic pump 57 for supplying the fluid of the tank, the cylinder 22 First and second solenoid valves 51 and 52 connected to the closing / opening ports (A and B) of the valves, respectively, to be turned on and off to feed the fluid back to the tank, and the closing and opening ports of the cylinders (A and B). Electronic proportional pressure controlled between the third and fourth solenoid valves 53 and 54 in three directions, the inlet of the third and fourth solenoid valves, and the A port / feedback line of the tank, respectively, to supply fluid to The electronic control valve 55, the valve 56 is connected in parallel with the electronic control valve 55 for manual pressure control.

Table 1 below shows the operation state of the valve and the pump of the conventional hydraulic device.

Cylinder status Pump First valve (51) Second valve (52) Third valve (53) Fourth valve (54) Electronic Control Valve (55) Opening ON ON OFF OFF ON OFF Closed ON OFF ON ON OFF OFF Pressure control ON OFF ON OFF OFF ON

Referring to this, in the conventional hydraulic device, when the fourth solenoid valve 54 is turned on during the opening operation of the cylinder, the third solenoid valve 53 is turned off to supply the fluid supplied from the hydraulic pump 57 to the cylinder B port. Will flow. At the same time, since the supply of fluid is blocked in the cylinder A port, return hydraulic pressure is generated, the first solenoid valve 51 is turned on, and the second solenoid valve 52 is turned off to feed back the fluid to the tank. On the other hand, in the cylinder closing operation, the hydraulic device 50 is turned on while the third solenoid valve 53 is turned on, and the fourth solenoid valve 54 is turned off to supply fluid supplied through the hydraulic pump 57 to cylinder A. FIG. The first solenoid valve 51 is turned off while the second solenoid valve 52 is turned on by the return hydraulic pressure generated at the cylinder B port. The first solenoid valve 51 is turned off to feed back fluid to the tank.

Thus, the conventional hydraulic device 50 turns off the solenoid control valve 55 during the opening / closing operation of the cylinder, but operates the solenoid control valve 55 at the set control pressure when controlling the closing operation of the cylinder at the set pressure. The fluid is supplied to the cylinder A port, and the second solenoid valve 52 is turned on by the return hydraulic pressure generated at the cylinder B port to feed back the fluid to the tank.

Figure 3 is a flow chart illustrating a fusion process of the conventional automatic welding device, referring to the fusion process is a preparatory work (S10), pressure melting (S11), heating maintenance (S12), heating device removal (S13), compression ( S14), cooling (S15), melting state check (S16), and so on in the order, the detailed working process is as follows. First, when the operator inputs the fusion working environment, the fusion operation command and the type of the plastic pipe to the key input unit 12, and clamps the plastic pipe to the clamp 21, the fusion control device 10 causes the cylinder of the hydraulic device 50 ( Adjust the hydraulic pressure in 22) to transfer the two plastic pipes to be joined to the welding position. Then, the traction force of the plastic pipe is measured and stored. The traction force is then calculated from the pressure magnitude over time.

Then, when the operator selects the chamfering button of the key input unit 12, the fusion control device 10 operates the chamfering 30 to perform the preparation work to chamfer both ends of the connection portion of the plastic pipe to a predetermined thickness do. When the chamfering operation is finished, the chamfer 30 is removed. After installing the heating device 40 heated to a predetermined temperature (for example, 210 ° C.) between the plastic pipes, the clamp is advanced, and the plastic pipe is brought into close contact with the heating device with traction and welding pressure (for example, 0.15 N / mm 2). A pressure melting operation is performed to heat the beads. Then, a heat holding operation is performed to depressurize the cylinder and keep the heating state for a predetermined time. When the heating is finished, the clamp is moved backwards and the heating device 40 is removed. Then, the pressure is immediately increased from 0 to the welding pressure, and both ends of the pipe in the molten state of the plastic pipe are pressed and fused. After the welded plastic pipe is cooled down while maintaining the welding pressure, and a welding state check operation for inspecting the joint portion of the plastic pipe is performed, the result of the welding operation is output.

In this fusion welding process, the role of the distance measuring unit 24 measures whether the chamfer 30 and the heating device 40 are installed by measuring the thickness (that is, the distance), and when the bead is generated, It is to measure whether the thickness is normal.

On the other hand, the fusion control device 10 adjusts the fusion parameters of temperature, pressure, and time according to the size of the plastic pipe and the measured traction force value, so that the fusion pressure required for the actual fusion process such as pressure melting, heating, pressing, and cooling processes To control the cylinder.

However, the conventional automatic welding device is preferable to operate on a flat surface or a workbench, but in most cases it is not the actual work site. In the case of fusion operation without installing automatic fusion device in flat area, it is difficult to obtain accurate traction value because the traction measurement of pressure change over time can be measured differently according to the slope of the work site.

In addition, since the heating device of the conventional automatic fusion device is mostly provided with only one sensor for detecting the temperature of the hot plate, if the welding operation proceeds to the wrong measurement value when the sensor malfunctions, it may cause a bead defect.

In addition, the hydraulic device of the conventional automatic welding device has a difficulty in controlling the opening and closing of the valve in the circuit according to the cylinder control conditions because the configuration of the hydraulic circuit is somewhat complicated.

In addition, in the case of the conventional automatic fusion device anyone can be easily operated except the authorized worker, the defect rate of the product is increased during the welding operation of the pipe, there was a problem such as equipment failure.

In addition, the conventional automatic welding device only has the function of outputting the result of the welding operation to the printer or the screen after the operation type, so that data on the processing of the operation cannot be obtained during the welding operation and no defects generated in the previous operation can be found. .

An object of the present invention is to measure the pipe conveying pressure to a certain distance when measuring the traction force in order to solve the problems of the prior art as described above can obtain the optimal traction value regardless of the place, the operator having a licensed ID card Only to operate the fusion device to provide an automatic fusion device that can reduce the cause of failure of the welding operation and equipment failure.

Another object of the present invention is to provide at least two sensors for detecting the temperature of the heating plate in the heating device to detect the temperature by operating the other sensor when any one of the temperature sensor malfunctions, so that the defect of the fusion operation due to the wrong temperature measurement is not disclosed. It is to provide an automatic fusion device that can prevent.

Still another object of the present invention is to provide an automatic fusion apparatus capable of controlling the opening and closing of the valve in the circuit according to the cylinder control condition by simply implementing the circuit configuration of the hydraulic device.

Another object of the present invention is to perform a selected operation from the welding operation menu to find and output the results of previous welding operation in the memory or to check a process in which a defect has occurred and to test the traction force, the operation of the machine, and the pressure adjustment to find the error. It is to provide a control method of the automatic welding device to be.

1 is a functional block diagram of a conventional automatic welding device for plastic pipes,

2 is a circuit diagram of a hydraulic apparatus of a conventional automatic welding device;

3 is a flow chart showing a fusion process of a conventional automatic welding device,

4 is a view showing an automatic welding device for plastic pipes according to the present invention,

Figures 5a and 5b is a view showing a cross-sectional view of the conventional chamfering section according to the present invention.

6 is a functional block diagram of an automatic welding device for plastic pipes according to the present invention;

7a and 7b are circuit diagrams showing an example of the hydraulic apparatus of the automatic welding device according to the present invention,

8 is a graph showing the pulling force measured in the automatic welding device according to the present invention,

9 is a graph showing the pressure change during the welding operation of the automatic welding device according to the present invention,

10a and 10b is a flow chart showing the operation of the automatic welding device for plastic pipes according to the present invention,

Fig. 11 is a menu block diagram for selecting a welding operation and its environment in the operation of the automatic welding device of the present invention.

Explanation of symbols on the main parts of the drawings

100: fusion control device 110: body

120: hydraulic device 130: chamfering machine

140: heating device

In order to achieve the above object, the present invention provides an automatic welding device for a plastic pipe that allows plastic pipes to be melted / bonded to each other, comprising: a clamp for clamping a fixed plastic pipe and a plastic pipe to be transported, and a predetermined hydraulic pressure transporting plastic pipe. A body having a cylinder for transferring to the fixed plastic pipe and a distance measuring unit for sensing a conveyed distance of the plastic pipe; A hydraulic apparatus for applying a predetermined pressure to a cylinder of the body, the fluid pressure and time having a linear proportional characteristic according to the material and thickness of the plastic pipe; Chamfering both ends of the plastic pipe, the chamfering edge of the chamfering plate has a predetermined angle outward from the central axis; A heating device including a compensation circuit for heating both ends of the pre-stick pipe in a set temperature band and sensing the temperature to prevent overheating; Control the operation of hydraulics, chamfers and heaters so that the plastic pipes are melted / bonded to each other in response to preset welding parameters and welding operation signals according to the plastic pipe thickness, and store the results and output them to signals output from the distance measuring unit. Therefore, it is characterized in that it comprises a fusion control device for checking the defect of the fusion operation process.

In order to achieve the above another object, the compensating circuit of the heating apparatus of the present invention includes at least two temperature sensors to detect the temperature of the hot plate, and forcibly releases the other temperature sensor in case of malfunction of one of the temperature sensors. Operation to output / correct the temperature signal sensed by the fusion control device.

In order to achieve the above another object, the hydraulic apparatus of the present invention is connected to a tank for storing a fluid, a hydraulic pump for supplying the fluid of the tank, and a closing / opening port of a cylinder, respectively, to supply the fluid back to the tank. And a third solenoid valve having a three-way valve for supplying fluid to a closed and open port of the cylinder, a second solenoid valve, an electronic proportional pressure controlled between an inlet of the third solenoid valve and a feedback line of the tank. Four solenoid valve, the fourth solenoid valve is connected in parallel with the fifth solenoid valve for manual pressure control.

According to another aspect of the present invention, there is provided a method of controlling an automatic fusion device for melting and bonding both ends of a plastic pipe, the method comprising: determining whether an ID card is inserted, and fusion operation when an authorized ID card is inserted. Outputting a menu and determining which job is selected from the menu, automatically changing the internal fusion parameters according to the size of the plastic pipe to be fused when the working environment is set in the welding job menu, and the size of the plastic pipe When the welding operation is set in the welding operation menu and the welding operation is set, determining whether the plastic pipe to be welded is mounted on the clamp, resetting the welding operation condition, and determining whether the temperature of the heating plate of the heating apparatus is the set temperature. And measuring the traction of the plastic pipe and storing the value. When the chamfer is mounted on the body, moving the plastic pipe to the chamfer, and when the chamfer operation command is applied, operating the chamfer at the pressure calculated according to the set welding parameters to chamfer both ends of the plastic pipe to a predetermined distance. And, if the chamfer is removed between the plastic pipes, judging the alignment of the pipes; if the temperature of the hot plate is at the set temperature and the heating device is mounted on the body, moving the plastic pipes to the heating device; and hydraulic pressure according to the set welding parameter. Adjusting the device to a heating pressure zone to melt the plastic pipe end, measuring the size of beads produced at the plastic pipe end with a distance measuring unit while maintaining the hydraulic pressure at the initial heating holding pressure, and heating between the plastic pipes When the device is removed, the hydraulics Pressing the plastic pipe at the positive welding pressure to bond the ends of the plastic pipe and measuring the size of the bonded beads, maintaining the hydraulic pressure at the welding pressure, cooling the bonded plastic pipe for a predetermined time, and Detecting position movement, and outputting and storing the welding operation process and the work result data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a view showing an automatic fusion device for plastic pipes according to the present invention, the automatic fusion device of the present invention, as in the conventional configuration, the body 110, the hydraulic device 120, the chamfering 130, the heating device ( 140, and a fusion control device 100.

The body 110 of the present invention is a clamp 111 for clamping the fixed plastic pipe and the plastic pipe to be transported, a cylinder 112 for transporting the transport plastic pipe to the fixed plastic pipe with a predetermined hydraulic pressure, fixing the plastic pipe to the clamp The bolt 113, the distance measuring unit 114 for detecting the transport distance of the plastic pipe.

The improved hydraulic apparatus (not shown) of the present invention is installed in the fusion control apparatus 100 and is connected to the body 110 by a hydraulic hose 126.

The improved chamfering machine 130 of the present invention includes a chamfering plate 131, a chamfering blade 132 having a predetermined angle with respect to the chamfering plate 131, and a motor 133 for rotating the chamfering plate 131. ), A wire 134 for applying power to the motor 133, and a handle 135.

The improved heating device 140 of the present invention controls the temperature to heat the hot plate 141 and the hot plate 141 in the set temperature band during the fusion operation, and the identification code from the heating device is the fusion control device 100. The control signal of the power supply and the fusion control device 100 to the control unit 142, the compensation circuit 144 for sensing the temperature of the hot plate and preventing overheating by detecting the temperature of the hot plate, and the handle 143 and the control unit 142. It consists of an electric wire 134 to apply.

Here, the compensation circuit 144 is provided with at least two or more temperature sensors to detect the temperature of the hot plate 141, forcibly releasing it in case of malfunction of any one of the temperature sensor and operating the other temperature sensor fusion control device By outputting / correcting the temperature signal sensed at 100, malfunction or failure of the sensor due to overheating of the hot plate is prevented in advance.

In addition, the automatic fusion apparatus of the present invention includes a card reader 101 for recognizing a card on which a password is recorded, a selection key input unit 102 for inputting a setting of a fusion operation environment and a fusion operation command, a fusion operation setting, and a fusion operation. A liquid crystal display 103 for displaying the working process and the result thereof, a power switch 104 for applying power to the system, an emergency switch 105 for stopping the operation when an error occurs during the welding process, and a fusion working process or the like The printer 106 outputs the result data and the bad data of the previous welding operation, and a modem (not shown) that receives the welding operation data through the remote computer 150 and monitors and corrects the welding operation process. In addition, together with the fusion control device 100 is configured as a system.

In addition, the fusion control apparatus 100 of the automatic fusion splicer of the present invention will be described in more detail later, but briefly when the ID card of the authorized operator is input from the card reader 101, the selection key input unit 102 Hydraulic device, chamfering machine 130 and heating device 140 so that the plastic pipes are melted / bonded with each other after the operator automatically sets the pipe thickness and the welding work environment and automatically changes the welding parameter and the process of the welding work process. Control the operation of the and stores the result, and determines the error / good of the fusion operation using the signal output from the distance measuring unit 114 of the body 110 during the fusion process.

5A and 5B are cross-sectional views of a conventional chamfering section and a chamfering section according to the present invention. Referring to this, the improved chamfering device of the present invention has a chamfering edge 132 with respect to the chamfering plate 131 has a predetermined angle, for example, an inclination angle of 5 °, while a conventional chamfering device has a chamfering edge with respect to the chamfering plate 31 It has an angle of 0 degrees at predetermined intervals. Accordingly, the present invention reduces the friction area between the plastic pipe cross section and the chamfering edge during the chamfering operation to reduce the load and allow the chamfered chip to be discharged in a constant direction outside the pipe to facilitate the removal of the chamfering chip after the end of the chamfering.

6 is a functional block diagram of the automatic welding device for plastic pipes according to the present invention, which is a detailed functional block diagram of the automatic welding device shown in FIG.

First, the automatic fusion device is composed of a card reader 101, a selection key input unit 102, a liquid crystal display 103, a printer 106, and a modem 107 as an input / output part of the fusion control apparatus 100. .

And, the fusion control apparatus 100 of the present invention is operated by receiving power by the power switch 104 and interrupts the operation when the emergency switch 105 is switched.

In addition, the automatic welding device of the present invention is provided with a GPS (Global Positioning System) receiver to search the location of the work site, and is provided with an uninterruptible power supply (UPS) 109, which is an uninterruptible power supply, when the power supply is abnormal Ensure a stable power supply to prevent errors in the operation.

In addition, the control device 100 of the automatic welding device of the present invention includes a memory 100a for storing data about the welding operation result, the welding operation environment, and the welding parameter, the card reading unit 101, and the selection key input unit 102. Or a corresponding fusion operation in accordance with an internal program in response to a signal input from the modem 107, displays the result of the operation or the setting of the fusion operation on the LCD screen 103, and displays the data of the fusion operation in the memory 100a. The microcomputer 100b stores and outputs the data to the microcomputer 100b.

7A and 7B are circuit diagrams showing an example of the hydraulic device of the automatic welding device according to the present invention, wherein the improved hydraulic device of the present invention has a linear proportionality of fluid pressure and time depending on the material and thickness of the plastic pipe.

As shown in FIG. 7A, the hydraulic apparatus 120 of the present invention includes a tank 127 for storing a fluid, a hydraulic pump 126 for supplying a fluid of the tank 127, and a closed / opening port A of a cylinder. First and second solenoid valves 121 and 122, respectively connected to B, for feeding back fluid back to the tank, and having a three-way valve for supplying fluid to the closing and opening ports A and B of the cylinder. A third solenoid valve 124 and a fourth solenoid valve 124 which are electronically proportional pressure controlled between an inlet of the third solenoid valve 123, an inlet of the third solenoid valve 123, and a feedback line of the tank 127. The parallel connection is composed of a fifth solenoid valve 125 for manual pressure control.

Table 2 below shows the valve and the pump operating state of the hydraulic device of Figure 7a.

Cylinder status Pump First valve 121 Second valve 122 Third valve 123 Fourth valve 124 Opening ON ON OFF ON ON Closed ON OFF ON OFF ON Pressure control ON OFF ON OFF Control ON

Referring to this, the hydraulic device is the third solenoid valve 123 and the fourth solenoid valve 124 is turned on during the opening operation of the cylinder to supply the fluid supplied through the hydraulic pump 126 to the cylinder B port do. At the same time, since the supply of fluid is blocked in the cylinder A port, return hydraulic pressure is generated, the first solenoid valve 121 is turned on, and the second solenoid valve 122 is turned off to feed back the fluid to the tank.

On the other hand, the hydraulic device is the third solenoid valve 123 is turned off when the cylinder close (close) operation, the fourth solenoid valve 124 is turned on to supply the fluid supplied through the hydraulic pump 126 to the cylinder A port The second solenoid valve 122 is turned on by the return hydraulic pressure generated at the cylinder B port to feed back the fluid back to the tank 127.

In addition, the hydraulic apparatus of the present invention is similar to the above-described cylinder closing operation when controlling the closing operation of the cylinder at the set pressure, but turns on the fourth solenoid valve 124 to the set control pressure.

And, the other hydraulic device 120 of the present invention, as shown in Figure 7b, between the tank 127 and the hydraulic pump 126, the closed / open port (A, B) of the cylinder and the hydraulic pump 126 A divert valve 123 'having a four-way valve for selectively supplying fluid to the ports A and B or feeding the fluid of the port back to the tank, and the fluid from the divert valve 123' It consists of an electronic control valve 124 'which is electronically proportional pressure-controlled between the on / off valve 121', the on / off valve 121 'and the direction change valve 123' supplied to.

Table 3 below shows the valve and the pump operating state of the hydraulic device shown in Figure 7b.

Cylinder status Pump ON / OFF VALVE (121 ') Directional Valve (123 ') Electronic control valve (124 ') Opening ON ON ON ON Closed ON ON OFF ON Pressure control ON ON OFF Control ON

In the hydraulic apparatus of FIG. 7B, the direction control valve 123 ′ is turned on while the electronic control valve 124 ′ is turned on during the opening operation of the cylinder to supply fluid supplied through the hydraulic pump 126 to the cylinder B port. do. At the same time, since the supply of fluid to the cylinder A port is blocked, return hydraulic pressure is generated and the fluid is fed back to the tank by the on / off valve 121 'in the on state via the directional valve 123'. .

On the other hand, in the hydraulic device, the direction control valve 123 'is turned off while the electronic control valve 124' is turned on when the cylinder is closed, thereby supplying the fluid supplied through the hydraulic pump 126 to the cylinder A port. And the fluid is transferred to the on / off valve 121 'through the turn-over valve 123' in the off state by the return hydraulic pressure generated at the cylinder B port, and the valve 121 'is in the on state. Feedback the fluid.

In addition, the hydraulic apparatus of the present invention operates similar to the above-described cylinder closing operation when controlling the closing operation of the cylinder at the set pressure, but turns on the electronic control valve 124 'to the set control pressure.

Therefore, as described above, the hydraulic apparatus according to the present invention leaves the fourth solenoid valve 124 of FIG. 7A or the valve 124 'of FIG. 7B, which is a set electronic control valve, turned on in the cylinder closing / opening operation, and the cylinder Is controlled by the pressure control method, the electronic control valve can be controlled in a linear proportional (pressure-time) method according to the material and thickness of the plastic pipe, so that the cylinder hydraulic pressure required for welding operation can be precisely controlled and the circuit configuration of the hydraulic device You can simply implement

Figure 8 is a graph showing the traction force measured in the automatic fusion apparatus according to the present invention, where the traction force Pe of the present invention is the pressure change over the distance (mm) and Pt is the maximum pressure at the moment the pipe is transported.

Referring to this, the fusion control device 100 of the present invention is the pressure when the pressure of the pipe to be transferred when measuring the traction force of the transport plastic pipe to the fixed plastic pipe (for example, just before both ends of the pipe to stick together) The frictional pressure is designated as the traction force value and used as the welding parameter (temperature, pressure, distance in the present invention).

9 is a graph showing the pressure change during the welding operation of the automatic welding device according to the present invention, the pressure (P) change of the hydraulic pressure with respect to the time (t) during the welding operation using a heating device. Referring to this, the pressure variation in the cylinder is pressurized melt interval (t _h) the pulling force (P _e) and is the sum of the pressure of the fusing pressure (P _f), heating and holding period (t _m) in the pulling force (P _e) and heated The holding pressure P _h is maintained at the combined pressure, the cylinder pressure is removed in the heater removal section t _{h '} , and the pressure is gradually increased in the compression section t _c1 and the traction force _Pe and the welding pressure P _f ) Is increased to the combined pressure and maintained at that pressure in the cooling section t _c2 .

Table 4 shows an example of the welding parameters that depend on the plastic pipe thickness during the gas pipe welding process according to the present invention.

Pipe thickness (mm) Initial bit generation width (mm), <P = 0.15N / mm2 + Traction force> Heating holding time (sec) <P = 0.001N / mm2 + Traction force> Heater removal time (sec) Cooling time (min) <P = 0.15N / mm2 + Traction force> 2 to 3.9 0.5 30 to 40 4 4 to 5 4.3 to 6.9 0.5 40 to 70 5 6-10 7.0 to 11.4 1.0 70-120 6 10 to 14

10A and 10B are flowcharts illustrating an operation process of an automatic welding device for plastic pipes according to the present invention.

The operation of the automatic fusion apparatus according to the present invention will be described with reference to the above-described drawings, and the operation process of the fusion apparatus will be described mainly based on the control routine of the microcomputer 100b in the fusion control apparatus 100.

First, when the operator completes the initial setting such as turning on the power switch and connecting the wire of the heating device and the chamfering machine and the hydraulic hose of the body to the fusion control device 100, the microcomputer 100b has a normal power source for fusion operation. Determine if it is authorized. If there is a problem with the power supply, the uninterruptible power supply 109 is operated to receive a stable power supply. (See S100 to S101)

When the power supply is normal, when the operator inserts the ID card into the card reader 101 of the fusion control device 100, the microcomputer 100b outputs a fusion operation menu to the liquid crystal display 103. Then, in response to the signal input from the selection key input unit 102, the microcomputer 100b determines which job the operator has selected from the fusion job menu. (See S102-S103)

If the fusion work environment is set in the fusion work menu, the microcomputer 100b receives the size of the plastic pipe to be fused from the operator, and the fusion parameters (material, temperature, pressure, and time) corresponding to the pipe pipe are set from the data set in the internal lookup table. Etc.) automatically. For example, if the thickness of the plastic pipe to be fused is 2 to 3.9 mm, the initial bead generation width is 0.5 mm, the heating holding time is 30 to 40 seconds, the heating device removal time is 4 seconds, and the cooling time is It takes 4 to 5 minutes.

When the fusion parameter setting is completed, a number of welding jobs can be distinguished by entering a job number and a welding number. (See S104 to S105)

When the operator installs the plastic pipe to be fused to the clamp 111 of the body 110, and selects the fusion operation from the fusion operation menu, the microcomputer (100b) to perform the fusion operation of the present invention according to the internal program. The welding operation menu includes a selection menu such as welding operation, cylinder position adjustment, welding operation environment setting, operation result print setting, welding machine test, and external computer connection. At this time, when the operator selects a menu other than the welding operation, the microcomputer 100b implements the operation of the menu by the internal program. (See S106 to S107)

Thus, the microcomputer 100b proceeds to the fusion operation process. First, the position of the cylinder is adjusted to maintain an interval at which the plastic pipe can be mounted, and it is determined whether the plastic pipe to be fused to the clamp is normally mounted. (See S108)

When the operator installs the plastic pipe in the clamp of the body, the microcomputer 100b is again subjected to the welding operation conditions (for example, welding sequence number, daily sequence number, sequence number, main pipe, division, field code display / material, outer diameter, temperature, and heating time). Fusion operation menu is outputted on the liquid crystal display 103 to reset the cooling time, pressure, and the like. Then, when a new fusion operation environment is set by the operator, the microcomputer 100b stores it again. (See S109)

Next, the microcomputer 100b determines whether the temperature of the hot plate of the heating device 140 is a set temperature (for example, 195 to 220 ° C). (See S110)

Then, the microcomputer 100b adjusts the hydraulic pressure of the cylinder through the hydraulic device 120 to move the clamp to a predetermined distance to measure the traction force of the pipe and store this value in the memory. (See S111)

Then, when the chamfer 130 is mounted on the body after moving the plastic pipe to the chamfer, the microcomputer (100b) detects the thickness of the chamfer between the pipes through the distance measuring unit 114 to the thickness of the chamfer Determine whether it is equal to the set value. (See S112 to S113)

Subsequently, when the operator inputs the chamfering operation through the selection key input unit 102, the chamfering operation command is applied to the microcomputer 100b. Thus, the microcomputer 100b operates the chamfer 130 at a pressure calculated according to the set welding parameter to chamfer both ends of the pipe to a predetermined distance (for example, 2 mm or more). (See S114)

After the chamfering operation is completed, the microcomputer 100b determines whether the end surface of the pipe is chamfered up to the set distance through the distance measuring unit 114, and returns to step 114 again or treats the defect as not being chamfered up to the set distance. (See S115)

The operator removes the chamfers between the pipes and removes the chamfering chips to determine the alignment (pipe thickness and void) of the plastic pipe. For example, the alignment state of the pipes is to close the ends of the pipes with the welding pressure to compare the alignment tolerances and the gaps of the pipes, and to reposition the pipes if they are in poor position. (See S116-S117)

If both pipes are within the set alignment range, the heater 130 is mounted to the body 110. Then, the microcomputer 100b moves the pipe to the heating device 130 by adjusting the hydraulic pressure of the cylinder, and detects the thickness of the hot plate of the heating device 130 between the pipes through the distance measuring unit 114 to detect the thickness of the hot plate. Determine whether the thickness of is equal to the set value. (See S118-S119)

When the thickness of the hot plate is equal to the set value, the microcomputer 100b adjusts the hydraulic device 120 to the heating pressure band, the pulling force plus the pressurizing pressure (for example, 0.15 N / mm 2) according to the set welding parameter to adjust the end of the pipe. Press melt. (See S120)

Next, the microcomputer 100b measures the bead size generated at the end of the pipe through the distance measuring unit 114 while maintaining the hydraulic device 120 at a traction force + -0.001 N / mm 2, which is a heating holding pressure. Then, a few seconds (for example, 10 seconds) before the end of the heating maintenance time, a buzzer sounds to notify the worker so that the heating device 130 can be quickly removed. (See S121)

Subsequently, when the heating device 130 is removed between the plastic pipes, the microcomputer 100b linearly increases the hydraulic device 120 to a predetermined welding pressure to compress the pipes to each other to join the ends of the plastic pipes. At this time, the plastic pipes are brought into contact with each other by the pulling force after the temporary stop before the welding pressure of the hydraulic device becomes the pulling force. The reason for this is to prevent a bad surface from occurring in the bead portion contacted by the feed speed when the pipe is pressed without pause. In addition, the beads are gradually melted at the connection portions of the plastic pipes bonded as described above, and the sizes of the beads that are melt-bonded to each other are measured through the distance measuring unit 114. (See S122 to S124)

Subsequently, the microcomputer 100b maintains the hydraulic apparatus 120 at the welding pressure to cool the joined plastic pipe for a predetermined time while keeping the cylinder at the welding pressure (traction force + 0.15 N / mm 2). And, while detecting the position movement of the pipe during the cooling time, the defect is detected whether the movement of the clamp is detected or the plastic pipe is pushed. (See S125 to S126)

Next, the microcomputer 100b stores the fusion operation process and the result data in the memory, and outputs the fusion operation process and the operation result data according to the print settings of the fusion operation already set. Then, the worker is informed that the fusion process is completed. (See S127)

On the other hand, in the operation of the fusion device of the present invention, when the operator selects the test or print setting in the fusion operation menu, the microcomputer 100b performs the fusion test or print setting mode. Here, a detailed implementation of the fusion machine test and print setting mode is shown in FIG. 11 below. (See S129 to S132)

11 is a menu block diagram for selecting a welding operation and its environment in the operation of the automatic welding device of the present invention, the fusion process of the present invention by the implementation of various functions of the automatic welding device as follows is convenient and optimal for operation Provide a fusion welding process.

Referring to FIG. 11, (a) the welding operation menu includes 1. welding operation and cylinder position adjustment, 2. welding operation environment setting, 3. operation result print setting, 4. welding machine test, and 5. external computer connection, etc. It consists of a menu.

And (b) fusion operation environment setting is 2-1. Changing fusion parameters, 2-2. Change work code (subject code / division code / site code, etc.), 2-3. Time change, and 2-4. It consists of a small selection menu such as screen brightness change (LCD screen brightness adjustment).

In addition, (c) print setting is 3-1. Print Operation Settings, 3-2. Job result selection output (from saved job results), 3-3. It consists of a small selection menu, such as a recent job error output. Here, the print operation setting, i.e., the output includes the fusion operation / after the type of fusion operation /, no output, external printing, and the like.

In addition, (d) fusion splicer test menu is 4-1. Instrument Operation Test, 4-2. Traction Measurement, 4-3. Pressure regulation test, 4-4. It consists of a small selection menu, such as a display of the current input status. Here, the instrument operation test confirms cylinder position marking and chamfering operation. The pressure regulation test then tests the pressure regulation of the hydraulic system (towing force + continuous pressure regulation / towing force + ON or OFF pressure / continuous pressure at set pressure, etc.). The current input status screen display function displays the power supply voltage, the current pressure, and the external temperature.

As described above, the automatic welding device of the present invention can overcome the error of traction measurement according to the position of the field work site, which may occur when measuring the traction force of the conventional time by measuring the traction force of the plastic pipe by the pipe pressure change up to a certain distance. This can greatly increase the reliability of the welding operation.

The heating apparatus of the automatic fusion apparatus of the present invention is provided with at least two sensors for detecting the temperature of the hot plate to operate the other sensor when one temperature sensor malfunctions to sense the temperature, thereby fusion operation (bead generation) ) Can be prevented in advance.

In addition, since the chamfering device of the automatic fusion splicer of the present invention has a predetermined angle with respect to the chamfering plate, most chamfering chips are discharged to the outside of the pipe while minimizing the load during chamfering so that the chamfering operation can be easily performed. Can be.

In addition, the automatic welding device of the present invention can control the hydraulic pressure of the cylinder even with a simple circuit configuration compared to the conventional hydraulic device can increase the production cost of the product.

In addition, the automatic fusion device of the present invention has the effect of reducing the defects of the welding operation and equipment failure due to the use of non-workers by operating the fusion device only by the operator having an authorized ID card using the ID card method. have.

In addition, the automatic fusion device of the present invention provides a variety of fusion operation menu for the convenience of the operator to add the self-test and print selection of the fusion device when setting the menu for the operation of the fusion operation and the operation processing in the memory By storing and managing, you can print out the results of previous fusion operations or check the details of the process where the failure (or error) has occurred.

Claims (12)

In the automatic welding device of plastic pipes to allow plastic pipes to be melted / bonded to each other, A body having a clamp for clamping the fixed plastic pipe and the plastic pipe to be transported, a cylinder for transporting the transport plastic pipe to the fixed plastic pipe with a predetermined hydraulic pressure, and a distance measuring unit for sensing a transport distance of the plastic pipe; A hydraulic device applying a predetermined pressure to the cylinder of the body, the fluid pressure and time having a linear proportional characteristic according to the material and thickness of the plastic pipe; Chamfering both ends of the plastic pipe, the chamfering edge of the chamfering plate has a predetermined angle outward from the central axis; A heating device including a compensation circuit for heating both ends of the pre-stick pipe in a set temperature band and sensing the temperature to prevent overheating; And Control the operation of the hydraulic device, the chamfer and the heating device so that the plastic pipes are melted / bonded to each other in response to a welding parameter and a welding operation signal preset according to the plastic pipe thickness, and store the result and from the distance measuring part. Automatic welding device characterized in that it comprises a fusion control device for checking the failure of the welding operation process in accordance with the output signal. The method of claim 1, wherein the compensation circuit of the heating device is provided with at least two or more temperature sensors to detect the temperature of the hot plate, forcibly canceling the malfunction of any one of the temperature sensor by operating the other temperature sensor Automatic fusion device characterized in that for outputting / correcting the temperature signal detected by the fusion control device. The automatic welding device according to claim 1, wherein the fusion control device designates a pressure when the pressure of the pipe to be transferred is set as a traction force value when measuring the traction force of the transfer plastic pipe with respect to the fixed plastic pipe. . According to claim 1, wherein the automatic welding device is A card reader for recognizing a card on which a password is recorded; A selection key input unit for inputting a setting of a welding operation environment and a welding operation command; A liquid crystal display for displaying a welding operation setting, a welding operation process, and a result thereof; A power switch for powering the system; Emergency switch to stop the operation in the event of an error in the welding process; A printer for outputting data of a fusion process or a result thereof and defect data of a previous fusion operation; A modem capable of receiving fusion operation data from the fusion control device through a remote computer and monitoring and modifying the welding operation process; Automatic welding device characterized in that it further comprises an uninterruptible power supply for supplying a stable power to prevent the error of the welding operation in the case of power failure. According to claim 1 and 4, wherein the fusion control device Memory for storing data on the welding operation result, the welding operation environment, and the welding parameter; And In response to a signal input from the card reader, a selection key input unit, or a modem, the corresponding welding operation is performed according to an internal program, and the result of the operation or the setting of the welding operation is displayed on the LCD screen, and the data of the welding operation is stored in the memory. Automatic fusion device characterized in that it comprises a microcomputer to store and output. The automatic welding device according to claim 1, wherein the automatic welding device further includes a GPS receiver to search for a location of the work site. The first and second solenoids of claim 1, wherein the hydraulic device is connected to a tank for storing the fluid, a hydraulic pump for supplying the fluid of the tank, and a closing / opening port of the cylinder to feed back the fluid back to the tank. A valve, a third solenoid valve having a three-way valve for supplying fluid to the closed and open ports of the cylinder, an electronic proportional pressure controlled fourth solenoid valve between the inlet of the third solenoid valve and the feedback line of the tank, And a fifth solenoid valve connected to the fourth solenoid valve in parallel for manual pressure control. 2. The hydraulic system of claim 1, wherein the hydraulic system comprises a tank for storing fluid, a hydraulic pump for supplying the fluid of the tank, selectively supplying fluid to the port or between the closed / opening port of the cylinder and the hydraulic pump A divert valve having a four-way valve for feeding back to the tank, an on / off valve for supplying fluid from the divert valve to the tank, and an electronic proportional pressure controlled between the on / off valve and the divert valve Automatic welding device characterized in that it comprises an electronic control valve. In the control method of the automatic welding device for melting and joining both ends of the plastic pipe, Determining whether an ID card is inserted; Outputting a fusion operation menu when the permitted ID card is inserted, and determining which operation is selected among them; Automatically changing the internal fusion parameters according to the size of the plastic pipe to be fused when the working environment is set in the fusion work menu; Determining whether the plastic pipe to be fused to the clamp is mounted when the size of the plastic pipe is input and the fusion operation is set in the fusion operation menu; Resetting the welding operation condition; Determining whether the temperature of the hot plate of the heating apparatus is a set temperature; Measuring a traction force of the plastic pipe and storing the value; Moving the plastic pipe to the chamfer when the chamfer is mounted to the body; Chamfering both ends of the plastic pipe to a predetermined distance by operating the chamfer at a pressure calculated according to the set welding parameter when the chamfering operation command is applied; Determining the alignment of the pipes when the chamfers are removed between the plastic pipes; Moving the plastic pipe to the heating device when the temperature of the hot plate is a set temperature and a heating device is mounted to the body; Melting the plastic pipe end by adjusting the hydraulic apparatus to a heating pressure zone according to the set welding parameter; Measuring the size of beads generated at the end of the plastic pipe through a distance measuring unit while maintaining the hydraulic pressure at an initial heating holding pressure; When the heating device is removed between the plastic pipes, the hydraulic device compresses the plastic pipe at a predetermined welding pressure to bond the ends of the plastic pipes to measure the size of the bonded beads; Maintaining the hydraulic pressure at the welding pressure, cooling the joined plastic pipe for a predetermined time and detecting a positional movement of the pipe during the cooling time; And And a step of outputting and storing the fusion operation process and the operation result data. 10. The method of claim 9, wherein when the plastic pipe is crimped, the plastic pipes are brought into contact with each other by a pulling force after a pause before the welding pressure of the hydraulic device becomes a pulling force. 10. The method of claim 9, wherein the welding operation menu comprises selection menus such as welding operation and cylinder position adjustment, welding operation environment setting, operation result print setting, welding machine test, and external computer connection. Method of controlling the automatic fusion apparatus characterized in that to implement the operation of the menu by. 12. The method of claim 9 and 11, wherein the fusion operation environment setting in the fusion operation selection menu is composed of a small selection menu such as fusion parameter change, operation code change, time change, and screen brightness change, The print setting includes a print operation setting for setting output among print, unprinted, and external prints during a fusion operation or after a fusion operation, a selective output for outputting a stored job result, an error output for outputting a recent job error, and the like. Consists of a selection menu, The welder test menu includes a device operation test for confirming cylinder position indication and chamfering operation, a traction measurement, a pressure test for testing pressure adjustment of the hydraulic system, and a screen display for displaying the current power supply, pressure, and external temperature. Method of controlling the automatic welding device, characterized in that consisting of a small selection menu.