JPH0157659B2 - - Google Patents

Abstract

PURPOSE:To easily perform socket welding of stable quality all the time by controlling displaying, sounding, and necessary clamping through the timers of each process for socket-welding of thermoplastic resin tubes. CONSTITUTION:A heater is pressingly contacted with the end inner face of a tubular coupler and the end outer face of tubes by the moving of one clamper for heating. Upon the contact of the heater, a start switch 25 turns ON and the timer 33 of a controller 32 is actuated. At the same time, a display lamp 38 flickers to display a heating and holding process, and before a given time for time-up of the timer 33, an intermittent sound is generated by a buzzer 41 to notify the ending of the process. The display lamp 38 is turned off as the process is ended, a continuous sound is generated by a buzzer 42 for a fixed period of time to notify a heater removal process. If the heater is not removed out during the period, the welding process of the tubes and the coupler is interrupted by the clamp responding to the demagnetization of the solenoid 30. Even for the following welding and cooling processes, stable, high-quality socket welding can be performed by easy operation in the same manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a socket welding machine for socket welding a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe joint.

In conventional socket fusion machines, a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe fitting are supported on the same axis, and the outer surface of the tube end and the inner surface of the pipe fitting are pressed against a heater to maintain a constant pressure. After heating and melting for a period of time, the ends of the tubes are inserted into pipe fittings and fused together. Factors that affect the socket fusing performance of such a socket fusing machine include the heating temperature by the heater, the pressing force, and the working time of the heating holding step, the heater removal step, the pressure bonding step, and the cooling step. However, conventionally, operations are performed while measuring the working time of each process using a wristwatch or the like. Therefore, the working time of each step may vary depending on the operator, or the welding procedure itself may be incorrect. Particularly when it takes time to remove the heater, sufficient fusion performance cannot be obtained. Therefore, if the joint is not inspected after the welding operation is completed, there is a risk that the welded state may remain poor.

The purpose of the present invention is to solve the above-mentioned technical problems,
To provide a socket fusion machine that can always obtain good fusion performance.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cutaway perspective view of an embodiment of the present invention. The end of a tube 1 made of thermoplastic synthetic resin, such as polyethylene, is clamped with a clamp member 2, and a pipe fitting 3 made of thermoplastic synthetic resin, such as polyethylene, is clamped with a clamp member 4. The clamp member 2 includes a pair of guide rods 6 provided on a base 5 parallel to the axes of the pipe 1 and the pipe fitting 3.
It is movable along 7.

The clamp member 2 is pivoted by a pin (not shown) parallel to the axis of the tube 1 and can be opened and closed upward.
On the opposite side to the pin with respect to the axis of the tube 1, the end of the locking piece 9 is pivotally supported by a pin 8 parallel to the axis of the tube 1. By threading the lock bolt 10 screwed onto the end of the lock piece 9 opposite to the pin 8 toward the locking protrusion 11, the pipe 1
is integrally clamped to the clamp member 2.

The clamp member 4 is pivoted by a pin (not shown) parallel to the axis of the pipe joint 3 and can be opened and closed upward. On the opposite side to the pin with respect to the axis of the pipe joint 3, the end of the lock piece 13 is pivotally supported by a pin 12 parallel to the axis of the pipe joint 3. This lock piece 13
A knob 14 is provided at the end opposite to the pin 12, and by rotating the knob 14, the locking collar 15 comes into contact with the locking protrusion 16, and the pipe fitting 3 is moved to the clamp member 4. It is integrally clamped to.

The clamp members 2 and 4 include the pipe 1 and the pipe fitting 3.
A handle 1 protrudes outward in both directions perpendicular to the axis of the
7 and 18 are provided respectively, and by gripping these handles 17 and 18, respectively, the clamp members 2 and 4 can be moved toward and away from each other.

When clamping the pipe 1 and the pipe fitting 3 with the clamp members 2 and 4, a depth gauge 20 as shown in FIG. 2 is prepared. This depth gauge 20 has a fitting hole 2 into which the end of the tube 1 is fitted.
1 and a fitting groove 22 into which the end of the pipe joint 3 is fitted are formed on mutually opposite end surfaces 23 and 24, respectively, so as to have the same axis. The depth h1 of the fitting hole 21 from the end surface 23 is set to a predetermined amount of protrusion of the tube 1 from the clamp member 2. Further, the depth h2 of the fitting groove 22 from the end surface 24 is set to a predetermined amount of protrusion of the pipe fitting 3 from the clamp member 4. Therefore, both end surfaces 23 and 24 of this depth gauge 20 are brought into contact with the clamp members 2 and 4, respectively, and the ends of the pipe 1 and the pipe fitting 3 are fitted into the fitting hole 21 and the fitting groove 22, respectively. By clamping the pipe 1 and the pipe fitting 3, the amount of protrusion from the respective clamp members 2 and 4 is always kept constant.

One of the clamp members 2 and 4, for example, the clamp member 4, has a start switch 2 connected to the other clamp member 2, as shown in a simplified manner in FIG.
5 is provided. This start switch 25 is
A protrusion 2 that contacts the heater 26 and is electrically conductive, and that protrudes from the clamp member 2 as shown in FIG.
Even if it comes into contact with 7, it will conduct. The amount of protrusion of the start switch 25 is selected so that the heater 26 comes into contact with the heater 26 when the heater 26 is inserted a specified amount into the pipe 1 and the fitting 3, and the amount of protrusion of the protrusion 27 is selected so that the amount of protrusion of the protrusion 27 corresponds to that of the pipe 1. The end portion is selected so as to come into contact with the start switch 25 when the end portion is inserted a specified amount into the pipe joint 3. Note that the start switch 25 is provided with a heat insulating material 28 in order to prevent the heat from the heater 26 from being transmitted as much as possible when the start switch 25 comes into contact with the heater 26.

Referring again to FIG. 1, the base 5 is provided with a locking mechanism 29. This lock mechanism 29 includes a solenoid 30 fixed to the base 5 and a plunger 31 driven by the solenoid 30. The solenoid 34 is provided near the center of the guide rod 6 to extend and retract the plunger 31 in a direction perpendicular to the axis of the guide rod 6, and the plunger 31 is pulled toward the guide rod 6 by a spring (not shown). Forced. Therefore, solenoid 30
In the state in which the plunger 31 is demagnetized, the plunger 31 is driven close to the guide rod 6, and in this state, the movement of the clamp member 2 to approach the clamp member 4 is prevented, as shown in simplified form in FIG. . Note that when the solenoid 30 is energized, the plunger 31 is drawn into the solenoid 30, allowing the clamp member 2 to move closer to the clamp member 4.

FIG. 6 is a block diagram showing a control circuit including start switch 25 and solenoid 30.
When the start switch 25 is turned on, a start signal is given to the control means 32. Control means 32
is equipped with a timer 33 that starts operating in response to input of the start signal. The control means 32 drives the solenoid 30 via the drive circuit 34 according to a predetermined procedure, and lights up the first, second, and third indicator lights 38, 39, and 40 via the drive circuit 35. Furthermore, the first and second buzzers 41 and 42 are driven to sound via the drive circuits 36 and 37.

The operation will be explained with reference to FIG. In FIG. 7, the first to third indicator lights 38 to 40 and the first and second buzzers 41 and 42 indicate a lighting and sounding state at a high level, and the solenoid 30 indicates an excited state at a high level. When performing the fusion work, the amount of protrusion of the pipe 1 and the pipe fitting 3 from the clamp members 2 and 4 is determined to a specified value by using the depth gauge 20 (see Fig. 2) described above. In this state, the clamp members 2 and 4 are used to clamp each member. Next, when a power source (not shown) is turned on, the solenoid 30 is energized. Therefore, the clamp member 2 is allowed to move close to the clamp member 4. In addition, the lower part of FIG. 7 shows displacement stroke patterns and pressing force patterns of the clamp member 2 corresponding to each process.

When performing the fusion work, the heater 26 is placed between the clamp members 2 and 4 as shown in FIG. move it. As a result, the outer surface of the end of the tube 1 and the inner surface of the pipe joint 3 are brought into pressure contact with the heater 26 and heated. At this time, when the heater 26 comes into contact with the start switch 25, a start signal is given from the start switch 25 to the control means 32, the timer 33 starts operating, and a first display is displayed to indicate that it is a heating holding process. Light 38 lights up. The first set time T1 of this heating holding step is, for example, a size 50A.
For pipes and fittings it is determined to be 20 seconds.

At a predetermined time T', for example, 5 seconds before the end of the heating holding process, the first buzzer 41 is sounded intermittently to notify that the next process is the heater removal process. Further, when the heating and holding step is completed, the first indicator light 38 is turned off and the second buzzer 42 is driven to continuously sound. This allows you to know that it is the heater removal process. Second set time for this heater removal process
T2 is set to 5 seconds, for example.

In the heater removal process, the clamp member 2 is separated from the clamp member 4 and the heater 26 is removed. This causes the start switch 25 to shut off.

The next step after the heater removal process is a crimping process, and when the second set time T2 of the heater removal process has elapsed, the second indicator light 39 is turned on to indicate that the crimping process is in progress. In this crimping process, the clamp member 2
is again moved toward the clamp member 4, and the pipe 1 is inserted into the pipe joint 3 by a specified amount and crimped. At the same time, the start switch 25 becomes conductive again and a start signal is applied to the control means 32. For example, the third set time T3 of this crimping process is
Selected in 30 seconds.

A predetermined time from the time when the crimping process ends
For example, 5 seconds before T'', the first buzzer 41 sounds intermittently to warn that the next step is the cooling step.

When the crimping process is completed, the third indicator light 40 lights up to indicate that it is the cooling process. During this cooling process, take your hands off the handles 17 and 18, and
And the mutual pressing force of the pipe fittings 3 is set to zero. The fourth set time T4 of such a crimping process is, for example,
Defined at 180 seconds.

When the cooling process is completed, the second buzzer 42 is sounded again to notify that the fusion work has been completed. Then, the clamping state of the pipe 1 and the pipe joint 3 by the clamp members 2 and 4 is released, thereby completing a series of welding operations.

In addition, the second set time is required for removing the heater 26.
When more than T2 is spent, i.e.
If the start signal from the start switch 25 is not input again to the control means 32 before the second set time T2 elapses, the solenoid 30 is demagnetized as shown by the broken line. Therefore, the plunger 31 protrudes and prevents the clamp member 2 from moving closer to the clamp member 4. By that,
Deterioration of fusing performance due to the long time it takes to remove the heater is prevented.

As described above, according to the present invention, each step is sequentially displayed on the display means, so it is possible to prevent mistakes in the fusing procedure. Furthermore, if the time required to remove the heater exceeds the set time, it is not possible to proceed to the crimping process, so that a fused portion of stable quality can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of an embodiment of the present invention, FIG. 2 is a simplified sectional view showing the depth gauge 20, FIG. 3 is a simplified sectional view showing the heating state by the heater 26, and FIG. 4 5 is a simplified sectional view showing the crimped state, FIG. 5 is a simplified view showing the fixed position of the locking mechanism 29, FIG. 6 is a block diagram showing the control circuit including the start switch 25 and the solenoid 30, and FIG. FIG. 7 is a timing chart for explaining the operation. DESCRIPTION OF SYMBOLS 1...Pipe, 2, 4...Clamp member, 3...Pipe joint, 25...Start switch, 26...Heater, 29...Lock mechanism, 38...First indicator light,
39...Second indicator light, 40...Third indicator light, 41
...First buzzer, 42...Second buzzer.

Claims (1)

[Claims] 1. An end of a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe joint are each individually clamped with a clamp member, and the outer surface of the pipe end and the inner surface of the pipe joint are heated. A heating holding step in which the heater is heated with water, a heater removal step in which the heater is removed from between the pipe and the pipe fitting, a crimping step in which the pipe and the pipe fitting are pressed together at a relatively high pressure and crimped together, and a cooling step are passed in this order. In the socket welding machine for socket welding the pipe and pipe fitting, provided on one of the clamp members,
a start switch that changes its switching mode when it comes into contact with either the other of the clamp members and the heater; a lock mechanism that prevents the two clamp members from moving toward each other; and display means that displays each of the steps; a timer that starts operating when the heater is detected by the start switch; the display means displays the corresponding process at preset times according to each process; and the heating holding process The present invention is characterized in that it includes a control means for operating the locking mechanism when the start switch has not yet detected the other clamp member when a predetermined time has elapsed in the heater removal step after completion. socket fusion machine.