JPS6245881Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fusion splicer for socket welding a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe joint, pipe, saddle, or the like.

In conventional socket fusion machines, for example, a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe fitting are supported on the same axis, and the outer surface of the end of the pipe and the inner surface of the pipe fitting are pressed against a heater. After heating and melting for a certain period of time, the ends of the tubes are inserted into pipe joints 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 this invention is to solve the above technical problems,
It is an object of the present invention to provide a fusion splicer 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. Pin 8 in this lock piece 9
By threading the locking bolt 10 screwed onto the opposite end toward the locking protrusion 11,
The tube 1 is integrally clamped to a clamping 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. An end portion of a locking piece 13 is pivotally supported by a pin 12 parallel to the axis of the pipe joint 3 on the opposite side to the pin with respect 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, is provided with a heater detection switch 50, as shown in a simplified manner in FIG. This heater detection switch 50 comes into contact with the attached heater 26 and becomes conductive. The heating detection switch 25 is the fourth
As shown in the figure, the clamp member 2 moves to the clamp member 4 side, and the pipe 1 and the pipe fitting 3 are connected to the heater 2.
6 or when the pipe 1 is inserted into the pipe joint 3, it comes into contact with the protrusion 27 of the clamp member 2 and becomes electrically conductive. The switch 50 is provided with a heat insulating material 28 in order to prevent heat from the heater 26 from being transmitted as much as possible when the switch 50 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 30 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 close to 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 switches 25, 50 and solenoid 30. Signals are provided from the switches 25 and 50 to the control means 32. The control means 32 includes a timer 33. This timer 33 is turned on when the heater detection switch 50 is turned on when the heater 26 is attached, and when the clamp member 2 is moved by the above-mentioned prescribed amount by the heating detection switch 25.
Only then does the clocking operation begin. The control means 32 controls the drive circuit 34 according to a predetermined procedure.
At the same time, the solenoid 30 is driven through the drive circuit 35, and the first, second and third indicator lights 38, 39, 40 are driven to turn on. 2 buzzer 4
1 and 42 are driven to blow.

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, as the heater 26 comes into contact with the switch 50, a signal is given from the switch 50 to the control means 32,
Further, the heating detection switch 25 becomes conductive when the ends of the pipe 1 and the pipe joint 3 are inserted into the heater 20.
As a result, the control means 32 controls both the switches 25,
Upon receiving the signal from 50, the first indicator light 38 turns on to indicate that the heating and holding process is in progress. The first set time T1 of this heating and holding step is set to 20 seconds, for example, for pipes and pipe fittings of size 50A.

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 switch 50 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 fitting 3 by a specified amount and crimped. At the same time, switch 25 becomes conductive again,
The signal is given to control means 32. The third set time T3 of this crimping process is selected to be 30 seconds, for example.

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.

Note that when the time exceeding the second set time T2 is spent removing the heater 26, that is, when the signal from the switch 25 is not inputted again to the control means 32 by the time the second set time T2 has elapsed. , the solenoid 30 is demagnetized as shown by the dashed line. Therefore, the plunger 31 protrudes and prevents the clamp member 2 from moving closer to the clamp member 4. This prevents deterioration in fusing performance due to the long time it takes to remove the heater.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a front view of an embodiment of the present invention.
The ends of a pair of thermoplastic synthetic resin pipes, such as polyethylene pipes 1 and 102, to be butt welded are
Clamp member 1 fixed to one end of base 103
04 and a clamp member 105 supported on a base 103 so as to be movable toward and away from the clamp member 104, respectively, with the same axis. When butt-welding both tubes 1 and 102, the end faces of both tubes 1 and 102 are ground by the grinder 7, and then the grinder 107 is removed. Next, a heater 106 (see FIG. 15, which will be described later) is interposed between both clamp members 104 and 105, and a welding operation is performed according to the procedure described later.

The clamp member 104 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 locking piece 1 is secured by a pin 110 parallel to the aforementioned pin.
The ends of 11 are pivoted. The pipe 1 is integrally clamped to the clamp member 104 by threading a bolt 112 threaded onto the end of the lock piece 111 opposite to the pin 110 toward the locking protrusion 113.

This clamp member 104 is fixedly provided at one end of the base 103. A pair of guide rods 115 parallel to the axial extension of the tube 1 are provided between one end and the other end of the base 103, and the clamp member 105 is provided movably along the guide rods 115.

The clamp member 105 is pivoted by a pin (not shown) parallel to the axis of the tube 102 and can be opened and closed upward. On the side opposite to the pin with respect to the axis of the tube 102, the end of a locking piece 117 is pivoted by a pin 116 parallel to the pin. Lock piece 117
At the end opposite to the pin 116, there is a bolt 11
8 is screwed. This bolt 118 is attached to the locking protrusion 1
By screwing the tube 102 toward the clamp member 105, the tube 102 is integrally attached to the clamp member 105.

The grinder 107 is provided near the clamp member 104 and can be opened upward. That is, grinding machine 1
07 is pin 1 parallel to the aforementioned pins 110 and 116.
A locking bolt 122 screwed onto the swinging piece 121 is engaged with a locking protrusion 123 to lock it in the posture shown in FIG. 8. be done. In that state, both pipes 1 and 10
The end face of 2 is ground. When the lock is released, the grinder 107 can be opened upwards. The heater 106 can be placed in the area where the grinder 107 was located when the grinder 107 was opened. A heater detection switch 191 is provided on the clamp member 104 and detects that the heater 106 is attached.

The clamp member 105 is displaced toward the clamp member 104, and the end surfaces of both tubes 1 and 102 are connected to the heater 1.
Pressure means 124 is provided for pressing the end surfaces of both tubes 1 and 102 against each other. The pressurizing means 124 includes a support shaft 125 that rotatably penetrates the clamp member 105 in a direction perpendicular to the pipe 102 and projects outward from the clamp member 105, and one end of which is pivoted to the protruding end of the support shaft 125. a link 126 that extends downward, and a pin 1 whose one end is pivoted to one end of the base 103 via a pin 127 parallel to the support shaft and whose other end is parallel to the pin 127.
The drive rod 130 includes a link 129 connected to the other end of the link 126 via a link 28, and a drive rod 130 whose lower end is fixed at right angles to the support shaft 125 and extends upward.

In this pressurizing means 124, by rotating the drive rod 130 around the support shaft 125 in the counterclockwise direction in FIG.
15 toward the clamp member 104.

A torque wrench 131 is provided to measure the pressing force exerted by the pressing means 124. This torque wrench 131 has a drive rod 13 as shown in FIG.
The pointer 134 fixed to the upper end of 0 and the drive rod 1
It consists of an operating rod 133 made of a flexible material, fixed in the middle of 30 and extending upward, and a scale plate 132 fixed to the operating rod 133. In this torque wrench 131, when the operating rod 133 is grasped and pressed in the direction of the arrow 135 (see FIG. 8), the operating rod 133 presses the drive rod 130 while being bent.
Thereby, the clamp member 105 is brought closer to the clamp member 104. The pressing force at that time is indicated by a pointer 134 on the scale plate 132.

In connection with the torque wrench 131, a pressing force holding means 136 is provided for keeping the pressing force set by the torque wrench 131 constant. This pressing force holding means 136 includes a guide tube 138 that is pivotally supported at the other end of the base 103 by a pin 137 parallel to the support shaft 125 and extends upward, and a guide tube 138 that is movably inserted into the guide tube 138. Rod 139 and pin 13
The operating rod 139 is pivoted to the upper end of the moving rod 139 by a pin 140 having an axis parallel to the operating rod 1.
33 and a connecting member 141 movably connected along its axis.

A lock mechanism 142 is provided in the pressing force holding means 136 to fix the relative displacement position of the moving rod 139 with respect to the guide tube 138. In this lock mechanism 142, by fixing the position of the movable rod 139, it becomes possible to keep the angular displacement position of the drive rod 130 and therefore the set pressure by the torque wrench 131 constant.

FIG. 10 is a sectional view showing the lock mechanism 142. This locking mechanism 142 includes first and second solenoids 143 and 144 provided at the upper part of the guide tube 138 at right angles to the axis.
The first and second plungers 145 and 146 of the solenoids 143 and 144 can penetrate the guide tube 138 at right angles to the axis and come into contact with the surface of the moving rod 139. Moreover, the first plunger 145 of the first solenoid 143 is urged in a direction toward the moving rod 139 by the spring force of the first spring 147, and the spring force of the first spring 147 is selected to be relatively large. Therefore, when the first solenoid 143 is demagnetized, the first plunger 145 abuts against the moving rod 139 with a relatively large force. Further, the second plunger 146 of the second solenoid 144 is urged in a direction approaching the moving rod 139 by the spring force of a second spring 148, and the spring force of the second spring 148 is selected to be relatively small. Therefore, when the second solenoid 144 is demagnetized, the second plunger 146 abuts the moving rod 139 with a relatively small force.

According to the present invention, the pressure melting process using a heater,
A control circuit as shown in FIG. 11 is provided in order to smoothly and continuously operate the heating and holding process, the heater removal process, the crimping process, and the cooling process at preset pressing forces and times. Control means 1
At 85, the timer 187 starts operating in response to simultaneous signals from the heating detection switch 186 and the heater detection switch 191.
The control means 185 excites the first and second solenoids 143 and 144 via drive circuits 188 and 189, and excites the first, second, and third solenoids via the drive circuit 150 according to a predetermined procedure. The fourth indicator lamps 151, 152, 153, and 154 are turned on, and the first and second buzzers 157, 158 are driven to sound via the drive circuits 155, 156.

The heating detection switch 186 is provided in association with the torque wrench 131, for example. That is, the first
2 and 13, a contact 159 is fixedly provided at a predetermined scale position on the scale plate 132, and a contact 160 that can contact the contact 159 is provided on the pointer 134. . Note that the scale plate 132 is made of a non-conductive material. The position at which the contact 159 is fixed is selected, for example, at a position of 1.3 kg/cm ² . This value is
This is the set pressure when pressing both tubes 1 and 102 against the heater and when pressing both tubes 1 and 102 against each other. Note that since the set pushing force differs depending on the size of the tube 1, 102, the contact point 159 may be fixed at a position corresponding to the target size.
When targeting a plurality of sizes, the contact points 159 may be arranged at a plurality of positions.

The operation will be explained with reference to FIG. In addition, in FIG. 14, the first to fourth indicator lights 151 to 15
4. The first and second buzzers 157 and 158 indicate a lighting and blowing state at a high level, and the first and second solenoids 143 and 144 indicate an excited state at a high level. When a power source (not shown) is turned on to perform the fusion work, the first and second solenoids 143 and 144 are energized. Therefore, the movable rod 139 is movable within the guide tube 138,
The operating rod 133 can be rotated freely.

In this state, first, as shown in Fig. 7, the grinding machine 1 is
After grinding the end face of the tube 1, 102 with 07,
Remove the grinder 107. Next, as shown in FIG. 15, a heater 106 is interposed between both tubes 1 and 102. By installing the heater 106,
Switch 191 becomes conductive. This heater 106 has a heating surface 106a perpendicular to the axes of both tubes 1 and 102,
106b. In this state, by gripping the operating rod 133 and rotating it in the direction shown by the arrow 135, the tube 102 moves in a direction approaching the tube 1, and the end surfaces of both tubes 1 and 102 are brought into contact with the heating surfaces 106a and 106a.
06b. When this pressing pressure reaches, for example, 1.3Kg/cm ² , the switch 186
A signal is given to the control means 185 from. The simultaneous generation of signals from switches 186 and 191 causes timer 147 to start operating. At the same time, the first indicator light 151 for indicating the pressure melting process is lit. Furthermore, the first and second solenoids 143 and 144 are demagnetized, so that the first and second plungers 145 and 146 are pressed against the surface of the moving rod 139 by the spring forces of the first and second springs 147 and 148. It will be done. Even if the user releases the operating rod 133 in this state, the position of the moving rod 139 remains fixed, and therefore the pressing force of both tubes 1, 102 against the heater 106 is maintained at 1.3 kg/cm ² . This pressurized melting process is set to a first set time T1 of, for example, 5 to 10 seconds.

When the first set time T1 has elapsed, the first indicator light 1
51 is turned off, and the second indicator light 152 for indicating the heating and holding process is turned on. Furthermore, the first
The solenoid 143 is energized, and the first plunger 1
45 is drawn into the first solenoid 143.
Therefore, the position of the moving rod 139 is determined by the position of the second spring 148.
The second plunger 14 due to the relatively small spring force of
The operating rod 133 moves in the opposite direction of the arrow 135 until the spring force of the second spring 148 and the reaction force from the heater 106 are balanced. rotate in the direction.
A balanced position in this manner is a position where the pressing force on the heater 106 is, for example, 0.1 to 0.3 kg/cm ² , and the spring force of the second spring 148 is selected accordingly. This heating holding step is set to a second set time T2 of, for example, 40 seconds.

The heater removal step follows the heat holding step, and the first buzzer 157 is sounded intermittently from a predetermined time T', for example, 5 seconds before the end of the heat holding step, until the end of the heat holding step. Ru. The first buzzer 157 allows the user to know that the heater removal process is approaching, and allows preparations for the heater removal process.

When the heating and holding process is completed, the second solenoid 1
44 is energized, the second plunger 146 is drawn into the second solenoid 144, and the locking mechanism 14
2 is released. Therefore, the pressing force on the heater 106 becomes zero. Furthermore, when the heating holding process is completed, the second buzzer 158 is driven to continuously sound to notify that the heater removal process is now in progress. This heater removal process is performed at the third set time T3.
For example, it is set to 5 seconds.

The heater 106 is removed during the third set time T3. This causes switch 191 to return to the cutoff state. By grasping the operating rod 133 again and rotating it in the direction of the arrow 135, both the pipes 1 and 102 are
The end faces of the two are pressed together and the crimping process begins. The pressing force from such an operating rod 133 is
When the pressure reaches 1.3 kg/cm ² , the switch 186 is activated, thereby lighting up the third indicator light 153 to indicate that it is the crimping process. Further, the first solenoid 143 is demagnetized, whereby the moving rod 139 is fixed by the relatively large spring force of the first spring 145, and a pressing force of 1.3 kg/cm ² is maintained, so that both pipes 1, 102 is crimped. The time for this crimping process is set to a fourth set time T4, for example, 40 seconds.

When the fourth set time T4 has elapsed, the fourth indicator light 1
54 lights up to indicate that it is a cooling process, and the first solenoid 143 is demagnetized.
As a result, the first plunger 145 is drawn into the first solenoid 143 in the locking mechanism 104a, and the moving rod 139 becomes free to move. Therefore, the mutual pressing force between the tubes 1 and 102 becomes zero. The fifth set time T5 of such a cooling step is selected to be 180 seconds, for example.

When this cooling process is finished, the second buzzer 158
is blown for, for example, only 5 seconds to notify that the series of fusion steps have been completed.

Note that when the time longer than the third set time is spent removing the heater 106, the first solenoid 1
43 is demagnetized as shown by the broken line in FIG. Therefore, the moving rod 1 by the first plunger 145
The movable rod 139 is fixed by the pressing force on the lever 39, making it difficult to rotate the operating rod 133. By doing so, it is possible to prevent the deterioration of the fusing performance due to the long time it takes to remove the heater.

FIG. 16 is a front view showing a start switch 186 according to another embodiment of the present invention, and FIG. 17 is a side sectional view of FIG. 16. In this example,
A long hole 166 is formed in the scale plate 132 along the scale, and the scale plate 1 passes through this long hole 166.
A protrusion 167 protruding from the back side of the pointer 134 is provided on the pointer 134. Further, on the back side of the scale plate 132, a proximity switch 168 as a heating detection switch is fixed at a preset scale position. The proximity switch 168 detects the proximity of the protrusion 167 and provides a signal to the control means 185.

Note that a reed relay may be provided in place of the proximity switch 168, and a magnet may be provided in the pointer 134.

FIG. 18 is a sectional view of another embodiment of the present invention. In this embodiment, a start switch 170 is provided in association with the operating rod 133 of the torque wrench 131. That is, a guide shaft 171 is fixed to the operating rod 133 at right angles within its rotation plane, and a cylindrical operating handle 172 is fitted into the guide shaft 171 so as to be freely displaceable. A coil spring 173 surrounding the guide shaft 171 is interposed between the operating rod 133 and the operating handle 172.

The start switch 170 is a limit switch, and has a preset pressure of, for example, 1.3 kg/cm ² .
The coil spring 173 is provided at a position where it is pressed by the operating handle 172 when the coil spring 173 is compressed to a pressing force of . This also serves as a start switch. Note that a proximity switch may be provided in place of the limit switch, and a plurality of limit switches or proximity switches may be provided corresponding to a plurality of set pressures.

FIG. 19 shows a lock mechanism 1 of another embodiment of the present invention.
75. FIG. The lock mechanism 175 of this embodiment includes a first rotary solenoid 176 and a second rotary solenoid 177, and a first screw member 178 and a second screw member 17 that are screwed forward and backward by the respective solenoids 176 and 177.
9 is screwed into the guide tube 138. Each screw member 17
8 and 179 are provided extending perpendicularly to the axis of the movable rod 139 and can come into contact with the surface of the movable rod 139. Moreover, the rotation angle of the first rotary solenoid 176 is large, and therefore the movable rod 139 is fixed with a relatively large force. Further, the rotation angle of the second rotary solenoid 177 is small, so the movable rod 139 is fixed with a relatively small force. Such a lock mechanism 175 can also perform the same function as the lock mechanism 142 described above.

As another embodiment of the present invention, a single screw member screwed into the guide tube 138 may be rotated by a single stepping motor at two rotation angles, large and small. The movable rod 139 can also be fixed with two types of pressure, large and small.

As yet another embodiment of the present invention, the extension of the tubes 1 and 102 from the clamp members 104 and 105 is kept constant, and the links 129 in the pressure means 124 and the guide cylinder 138 in the pressing force holding means 136 are Therefore, a start switch may be activated.

FIG. 20 is a perspective view of still another embodiment of the present invention. A tube 1 made of thermoplastic synthetic resin, such as polyethylene, is clamped by a first clamp member 202 . A saddle 203 made of thermoplastic synthetic resin, such as polyethylene, is clamped by a second clamp member 204 . Second clamp member 204
is movable in a direction perpendicular to the axis of the tube 1, and is displaced by the pressurizing means 205.

The first clamp member 202 can be opened and closed around an axis parallel to the axis of the tube 1, and the tube 1 is reliably clamped by, for example, three lock pieces 206. The first clamp member 202 is provided at a fixed position on the base 207, and the base 207 has a pair of guide rods 208 extending in a direction perpendicular to the axis of the tube 1.
209 is provided. The second clamp member 204 is provided movably along the guide rods 208 and 209, and is attached to the saddle 2 by a screw member 210.
03 can be held fixedly. Furthermore, the second
The clamp member 204 has a grip portion 211 that is detachable depending on the size of the saddle 203.

The pressurizing means 205 includes a support shaft 212 provided on the second clamp member 204 and having an axis parallel to the pipe 1.
The drive rod 213 is pivotally supported. By rotating this drive rod 213 around the support shaft 212 in the direction shown by the arrow 214 in FIG.
Clamp member 204 moves toward first clamp member 202 .

A torque wrench 215 is provided in association with the pressurizing means 205 for setting the pressurizing force. As shown in FIG. 21, the torque wrench 215 includes a pointer 216 fixed to the upper end of the drive rod 213, and an operating rod made of a flexible material that is fixed to the middle of the drive rod 213 and extends upward. 217 and operating rod 217
It consists of a scale plate 218 fixed to. Operation rod 2
17 in the direction shown by the arrow 214, the operating rod 217 bends and moves the drive rod 213.
, thereby pressing the second clamp member 204
is approached toward the first clamp member 202.
The pressing force at that time is indicated by a pointer 216 on the scale plate 218.

In connection with the torque wrench 215, a pressing force holding means 220 is provided for keeping the pressing force set by the torque wrench 215 constant. This pressurizing force holding means 220 has a support shaft 21 attached to the base 207.
2, a guide tube 222 that extends upward and is supported by a pin 221, a moving rod 223 that is movably inserted into the guide tube 222, and a pin 224 that has an axis parallel to the pin 221. bar 223
A connecting member 2 is pivotally supported at the upper end and is connected to the operating rod 217 so as to be movable along its axis.
25.

In the pressurizing force holding means 220, the moving rod 223
A locking means 226 is provided for fixing the relative position of the guide cylinder 222. By fixing the position of the movable rod 223 in the locking means 226, it becomes possible to keep the angular displacement position of the drive rod 213 and therefore the set pressure by the torque wrench 215 constant.

FIG. 22 is a sectional view showing the locking means 226. This locking means 226 includes a solenoid 227 located at the top of the guide tube 222 and perpendicular to the axis. The plunger 228 of the solenoid 227 passes through the guide tube 222 in a direction perpendicular to the axis and moves the moving rod 2
23 surface. Moreover, the plunger 228 is biased in a direction toward the moving rod 223 by the spring force of the spring 229, and when the solenoid 227 is demagnetized, the plunger 228 is biased by the spring force of the spring 229. The movable rod 223 is pressed against the movable rod 223. As a result, movement of the moving rod 223 is stopped and fixed. Therefore, the pressurizing force by the pressurizing means 205 is kept constant, and the pressurizing operation by the pressurizing means 205 is restrained. That is, the locking means 226 also has the function of inhibiting the pressurizing operation by the pressurizing means 205. Note that when the solenoid 227 is energized, the plunger 228 is drawn into the solenoid 227 against the spring force of the spring 229, so that the moving rod 223
movement will be allowed.

A heating detection switch 231 for detecting that the applied pressure has reached a set pressure is provided in association with the torque wrench 215, as shown in FIGS. 23 and 24. A contact 232 is fixedly provided at a predetermined scale position on the scale plate 218, and a contact 233 that can come into contact with the contact 232 is provided on the pointer 216. In addition, the scale plate 21
8 is made of a non-conductive material. The position at which the contact point 232 is fixed is selected, for example, at a position of 30 kg. This value corresponds to tube 1 and saddle 203.
This is the setting force when pressing the tube 1 and the saddle 203 together against the heater. When the heater is attached, the heater detection switch 271 detects the heater and turns on the heater.

Figure 25 shows switch 231 and solenoid 2.
27 is a block diagram showing a control circuit including the control circuit 27. FIG. A signal is given from the heating detection switch 231 to the control means 234 when it is conductive. The control means 234 is equipped with a timer 235 which starts a timing operation when the switch 271 becomes conductive when the heater is attached and the pressurizing force reaches a predetermined value. It will be done. Control means 23
4 is a drive circuit 236 according to a predetermined procedure.
While driving the solenoid 227 via
The first, second, and third indicator lights 238, 239, and 240 are driven to turn on through the drive circuit 237, and the first and second buzzers 241 and 242 are driven to sound through the drive circuits 243 and 244.

The operation will be explained with reference to FIG. Furthermore, the second
In Figure 6, the first, second and third indicator lights 23
8 to 240 indicate a lighting and blowing state at a high level, and the solenoid 227 indicates an excited state at a high level. The tube 1 is clamped to the clamp member 202 at the portion where the saddle 203 is to be fused, and the saddle 20
3 is clamped by the clamp member 204. When a power source (not shown) is turned on, the solenoid 227 is excited and the pressurizing operation by the pressurizing means 205 is permitted. Note that the pressing force pattern is shown at the bottom of FIG. 26.

To perform the fusion work, a heater (not shown) is placed between the tube 1 and the saddle 203, and the operating rod 217 is rotated in the direction shown by the arrow 214 in FIG. The second clamp member 204 is moved toward the first clamp member 202. At this time, switch 271 becomes conductive. The tube 1 and saddle 203 are pressed against the heater. When the force reaches the set force, a signal is given from the switch 231 to the control means 234. Solenoid 22 accordingly
7 is demagnetized, and the first indicator light 238 for indicating the heating and holding process is turned on. The moving rod 223 is fixed by demagnetizing the solenoid 227,
Therefore, the heating holding pressure is maintained at the set pressure. The first set time T1 of this heating and holding step is set to, for example, 50 seconds.

The first buzzer 241 intermittently sounds a time T', for example, 5 seconds before the end of the heating and holding step. This allows the operator to know that the heater removal step is approaching, and to prepare for the heater removal operation.

When the heating holding process is completed, the second buzzer 242 is driven to continuously sound in order to notify that it is the heater removal process, and the solenoid 22
7 is excited. The second set time T2 of this heater removal process is set to, for example, 5 seconds, and during this time the second clamp member 204 is separated from the first clamp member 202 and the heater is removed. This causes switches 231 and 271 to shut off.

In the crimping process following the heater removal process, the saddle 203 is pressed against the tube 1. After the heater removal process, when the pressurizing force reaches the set force again, the switch 231 becomes conductive, the second indicator light 239 lights up to indicate that it is the crimping process, and the solenoid 227 is demagnetized. As a result, the movable rod 223 is fixed and the pressing force is maintained at the set force. For example, the third set time T3 of this crimping process is
Set to 60 seconds.

For example, 5 seconds before the end of the crimping process, the first buzzer 241 is intermittently driven to sound, giving notice that the next process will be the cooling process.

When the crimping process is completed, the third indicator light 240 for indicating that it is the cooling process is turned on, and the solenoid 227 is energized. As a result, the pressurizing force holding function is canceled and the pressurizing force becomes zero. For example, the fourth set time T4 of this cooling process is
Set to 180 seconds.

When the cooling process is completed, the second buzzer 242 is sounded again to notify that the fusion work has been completed. Then, the clamping state of the tube 1 and the saddle 203 by the clamp members 202 and 204 is released, thereby completing a series of welding operations.

Note that when it takes more than the second set time T2 to remove the heater, that is, when the signal from the switch 231 is not input again to the control means 234 by the time the second set time T2 elapses, the solenoid 227 is activated. Since it is demagnetized, the pressurizing means 205
Pressurizing operation becomes difficult. Therefore, deterioration in fusing performance due to the long time it takes to remove the heater is prevented.

FIG. 27 shows a switch 24 according to another embodiment of the present invention.
FIG. Figure 28 is the 27th
FIG. In this embodiment, the scale plate 2
18 is formed with a long hole 246 along the scale, and the pointer 216 is provided with a protrusion 247 that passes through the long hole 246 and projects to the back side of the scale plate 218. Further, on the back side of the scale plate 218, a proximity switch 248 as a heating detection switch is fixed at a preset scale position. This proximity switch 24
8 detects that the protrusion 247 approaches and provides a start signal to the control means 234.

Note that a reed relay may be provided in place of the proximity switch 248, and a magnet may be provided in the pointer 216.

29 is a cross-sectional view of another embodiment of the present invention. In this embodiment, a switch 250 is provided in association with an operating rod 217 of a torque wrench 215. That is, a guide shaft 251 is fixed to the operating rod 217 at a right angle within the rotation plane of the operating rod 217.
A cylindrical operating handle 252 is inserted into the operating rod 217 so as to be freely displaceable.
A coil spring 253 surrounding the guide shaft 251 is interposed between them.

The switch 250 is a limit switch,
It is provided at a position where it is pressed by the operating handle 252 when the coil spring 253 is compressed until a predetermined setting force, for example, 30 kg, is reached. This also serves as a heating detection switch. Note that a proximity switch may be provided in place of the limit switch.

FIG. 30 shows locking means 2 of another embodiment of the present invention.
55. FIG. The locking means 255 of this embodiment includes a rotary solenoid 256, and a screw member 257 that is screwed forward and backward by the rotary solenoid 256 is screwed into the guide tube 222. This screw member 257 is provided extending perpendicularly to the axis of the movable rod 223 and can come into contact with the surface of the movable rod 223. Such locking means 25
5 can also perform the same function as the locking means 226 described above.

As yet another embodiment of the present invention, the pressurizing means 2
The switches 231, 245, 2 are switches whose switching mode is changed by the guide cylinder 222 when the pressurizing force by 05 reaches the set pressure.
50 may be provided instead.

FIG. 31 is a perspective view showing a saddle fusion machine according to another embodiment of the present invention. In this saddle fusion machine, a first clamp member 260 clamps the tube, and a second clamp member 261 clamps the saddle. The second clamp member 261 is movable toward the first clamp member 260 along the guide rods 262 and 263, and the pressure means 2
64. Pressure means 246
is equipped with a handle 265 that is rotatable around an axis perpendicular to the axes of the guide rods 262 and 263, and by rotating the handle 265, the second
The clamp member 261 is the first clamp member 26
Move close to 0.

In such a saddle fusion machine, as well as in the saddle fusion machine of the embodiment shown in Figs. 20 to 26, there is a heater detection switch 271 that detects that the heater is attached, and a heater detection switch 271 that detects when the pressurizing force reaches a set value. By providing a heating detection switch for detecting this, a pressurizing force release mechanism, a mechanism for preventing movement of the second clamp member 261, etc., the same effects as in the embodiment shown in FIGS. 20 to 26 can be achieved. Can be done. For example, the heating detection switch may be a limit switch that detects when the handle 265 is rotated to the maximum extent.

As described above, according to the present invention, it is possible to prevent the occurrence of defective fusion due to variations in time intervals and pressure, and errors in the fusion procedure, and to obtain a fused portion of stable quality. Furthermore, the fusing operation can be performed by a single operator, and since there is no need to monitor the present fusing machine especially after the crimping process, it is possible to perform the fusing process concurrently with other work, improving work efficiency. Furthermore, the fusing work can be performed by unskilled workers. Further, according to the present invention, the heater is detected by the heater detection switch, and at the same time, the heating detection switch detects that the amount of movement or pressing force of the clamp members in the mutual proximity direction exceeds a predetermined value. When the timer is detected, the timer starts ticking, so the centering, chamfering, and cleaning of the welding surfaces of the pipes, socket fittings, saddles, etc. to be connected can be done before the heater is installed. The operation is controlled only after such preparatory work is completed. Therefore, without causing operational errors,
Connection operations can be carried out and material loss caused by incorrect connection operations can be prevented.

[Brief explanation of the drawing]

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. 7 is a timing chart for explaining the operation, FIG. 8 is a front view of an embodiment of the present invention, FIG. 9 is a sectional view showing the torque wrench 131, FIG. 10 is a sectional view showing the lock mechanism 142, Figure 11 is a block diagram showing the control circuit.
Figure 2 is a front view showing the mounting position of the start switch 186, Figure 13 is a right side view of Figure 12, and Figure 14 is a right side view of Figure 12.
The figure is a timing chart to explain the operation.
FIG. 15 is a front view corresponding to FIG. 1 when a heater 106 is interposed, FIG. 16 is a front view showing a start switch 165 of another embodiment of the present invention, and FIG. 17 is a front view of FIG. 18 is a sectional view showing a start switch of another embodiment of the present invention; FIG. 19 is a sectional view showing a locking mechanism 175 of another embodiment of the invention; FIG. 20 21 is a sectional view showing the torque wrench 215, FIG. 22 is a sectional view showing the locking means 226, and FIG. 23 is a sectional view showing the switch 231.
24 is a right side view of FIG. 23, and FIG. 25 is a block diagram showing the control circuit including the switch 231 and the solenoid 227.
FIG. 26 is a timing chart for explaining the operation, FIG. 27 is a front view showing a switch 245 of another embodiment of the present invention, FIG. 28 is a side sectional view of FIG. 27, and FIG. 29 is a diagram of the present invention. 30 is a sectional view showing a locking means 255 of another embodiment of the present invention, and FIG. 31 is a sectional view of a saddle welding machine of another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Pipe, 2, 4... Clamp member, 3... Pipe joint, 25... Heating detection switch, 26... Heater, 29... Lock mechanism, 38... First indicator light,
39...Second indicator light, 40...Third indicator light, 41
...First buzzer, 42...Second buzzer, 50...
Heater detection switch, 102... tube, 104, 1
05... Clamp member, 106... Heater, 12
4... Pressure means, 136... Pressing force holding means, 1
42, 175... Lock mechanism, 185... Control means, 186, 165, 170... Heating detection switch, 187... Timer, 191... Heater detection switch, 202, 260... First clamp member,
203... Saddle, 204, 261... Second clamp member, 205... Pressure means, 220... Pressure force holding means, 226, 255... Lock means, 2
31,245,250...Switch, 234...
Control means, 235...timer.

Claims (1)

[Claim for Utility Model Registration] The end of a thermoplastic synthetic resin pipe and a thermoplastic synthetic resin pipe joint, pipe, saddle, etc. are individually clamped with clamp members, and the parts to be connected. A heating and holding process in which the parts are heated with a heater, a process in which the heater is removed, a crimping process in which the parts to be connected are pressed against each other under relatively high pressure, and a cooling process are completed in this order to create the fusion bond. In the fusion splicer to be connected, a heater detection switch detects that the heater is attached, a heating detection switch detects the amount of movement of the clamp members in the mutual proximity direction or the mutual pressing force between the parts to be connected, and the heater. It is equipped with a timer that starts the clock operation when the heater is detected by the detection switch and the amount of movement or pressing force is detected by the heating detection switch, and the operation is controlled at predetermined time intervals according to each of the above steps. A fusion splicer comprising: a control means for controlling the fusion splicer.