JPH06166106A - Fusion splicing machine and butt splicing method using same - Google Patents

Abstract

PURPOSE:To provide a fusion splicing machine which can prevent the dispersion in butting pressure in the butt splicing the tubular ends of molded products of thermoplastic resin. CONSTITUTION:The fusion splicing machine is equipped with a fixed clamp 1A, a movable clamp 1B, and a heater 2. The movable clamp 1B is movably provided in the direction of splicing a joint held by the fixed clamp 1A and a pipe held by the movable clamp 1B. The heater 2 is provided to be able to reciprocate between the using position where the joint and the pipe, which are held respectively by the fixed clamp 1A and the movable clamp 1B, can be heated and the waiting position where the joint and the pipe can be spliced without hindrance. The following additional units are provided: a motor 4 for the clamp which transfers the movable clamp 1B in the splicing direction; a limit switch 15 which is positioned close to the clamp and detects the optimum butting pressure between the joint the pipe which are butted by a given pressure; and a control circuit which stops the motor 4 for the clamp when the limit switch 15 detected the optimum butting pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusing machine for abutting and fusing thermoplastic resin molded products having tubular ends such as pipes and joints, and a butt fusing method using the fusing machine. .

[0002]

2. Description of the Related Art A fusion machine for fusion-bonding thermoplastic resin molded products having tubular ends, such as pipes and joints, is provided with a pair of clamps formed so that the tubular ends of the thermoplastic resin molded products can be held. Provided so as to be movable in the axial direction of the gripped tubular end,
In addition, a heater formed so that the tubular end of the thermoplastic resin molded product can be heated, a use position where the tubular ends held by both clamps can be heated, and a standby position where there is no obstacle when the tubular ends are butted against each other. There is one configured to be reciprocally movable between the two.

A fusion machine of this type is actually developed by Shokai 56-
As described in Japanese Patent No. 26217, conventionally, an operation handle has been manually operated to move a clamp.

[0004]

However, in such a conventional fusion machine, since the work of moving the clamp is a manual work, the operator is troubled and the tubular ends are abutted and fused together. There will be variations in pressure when wearing,
There are problems that the pressure is too high and extra beads are generated, and that the pressure is too low and proper bonding strength cannot be obtained.

In view of the above problems, the present invention makes it possible to automatically butt-weld the tubular ends of a thermoplastic resin molded product together, and to prevent the butt pressure from varying. An object of the present invention is to provide a fusing machine capable of stabilizing the fusing strength, that is, improving the reliability of the joint portion, and a butt fusing method using the fusing machine.

[0006]

In order to achieve the above object, in the fusion machine of the present invention, a first clamp and a second clamp which are formed so as to be able to grip the tubular end of a thermoplastic resin molded article are provided. And a heater formed so that the tubular end of the thermoplastic resin molded product can be heated, and the second clamp has
The tubular end gripped by the first clamp and the tubular end held by the second clamp are movably provided in a butting direction in which the tubular end held by the second clamp is abutted, and the heater is tubular held by the first clamp. A use position where the end and the tubular end held by the second clamp can be heated, and an obstacle occurs when the tubular end held by the first clamp and the tubular end held by the second clamp are butted. In the fusion machine provided so as to be capable of reciprocating between the standby position and the standby position,
Clamp driving device for moving the clamp in the direction of butting, and the tubular end held by the first clamp and the tubular end held by the second clamp are butted at a predetermined pressure. A butt state detecting means for detecting the optimum pressure state and a control circuit for stopping the operation of the clamp drive device when the butt state detecting means detects the optimum butt pressure state are provided. .

When the above-mentioned fusion machine is used, the first
And the second clamp holds the tubular end of the thermoplastic resin molded article, and the first clamp holds the tubular end of the thermoplastic resin molded article, and the first clamp holds the tubular end of the thermoplastic resin molded article. The tubular end of the thermoplastic resin molded product gripped by the second clamp is heated by the heater disposed in the use position until it melts, and then the heater is moved from the use position to the standby position and then controlled. Based on the control by the circuit, the second clamp is moved by the clamp drive device until the butting state detecting means detects the butting pressure optimum state, and after the butting state detecting means detects the butting pressure optimum state. The operation of the clamp driving device is stopped, and the tubular end held by the first clamp and the tubular end held by the second clamp are abutted and fused in a molten state in this manner. Rukoto can.

[0008]

In the fusing machine according to claim 1 of the present invention, first of all,
And the second clamp holds the tubular end of the thermoplastic resin molded article, and the first clamp holds the tubular end of the thermoplastic resin molded article, and the first clamp holds the tubular end of the thermoplastic resin molded article. The tubular end of the thermoplastic resin molded product gripped by the second clamp is heated close to or in contact with the heater disposed at the use position until it is melted.

Next, after the heater is moved from the use position to the standby position, the second clamp is driven by the clamp drive device until the butt state detection means detects the butt pressure optimum state under the control of the control circuit. Is moved and the operation of the clamp drive device is stopped after the butting state detecting means detects the butting pressure optimum state. This operation is performed while the tubular end held by the first clamp and the tubular end held by the second clamp are in a molten state.

Then, the tubular end gripped by the first clamp and the tubular end gripped by the second clamp are butt-welded together at a preset pressure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the fusing machine of the first embodiment will be described with reference to FIGS. As shown in the side view of FIG. 1, the plan view of FIG. 2, and the front view of FIG. 3, the fusion machine of the present embodiment has a fixed clamp 1A, a movable clamp 1B,
Heater 2, spacer 3, clamp motor 4
And a heater motor 5.

The fixed clamp 1A is fixed to a pedestal 1a, and the pedestal 1a is fixed on a base 6. The structure of the fixed clamp 1A is the same as the structure of the moving clamp 1B which will be described later. Therefore, the constituent members shown in the drawings are denoted by the same reference numerals as those of the moving clamp 1B, and the description thereof will be omitted.

As shown in FIG. 3, the movable clamp 1B can hold the tubular end of the thermoplastic resin molded product P by a receiving member 1b and a stopper member 1d connected to the receiving member 1b by a hinge 1c. The receiving member 1b.
A pair of liners 1e each having a ring split in half are attached between the and the stop member 1d. The liner 1e having an inner diameter corresponding to the outer diameter of the tubular end to be gripped is appropriately selected to receive the receiving member 1b and the stopping member 1d.
It is designed to be installed between and. In addition, 1f in the figure
Is a liner fixing knob for fixing the upper liner 1e to the stopper member 1d, and 1g in the figure regulates the rotation of the stopper member 1d about the hinge 1c to prevent the tubular end of the thermoplastic resin molded product P from moving. It is a clamp fixing knob for fixing to the fixed clamp 1A.

The moving clamp 1B is fixed to the pedestal 1a, and the pedestal 1a is guided by the guide rails 7 provided on the upper surface of the base 6 and fixed clamp 1A.
The tubular end of the thermoplastic resin molded product J gripped by the movable end 1B and the tubular end of the thermoplastic resin molded product P gripped by the moving clamp 1B are moved in the butting direction and the tubular end is moved away from each other. It is possible. The fixed clamp 1A and the moving clamp 1B are installed such that the tubular ends gripped by both are arranged coaxially, and therefore the moving clamp 1B is arranged in the axial direction of the gripped tubular end. Will move. 8 in the figure
A stopper knob for restricting the movement of the moving clamp 1B. As shown by the solid line in FIG. 1, the movement is restricted when the movable clamp 1B is tilted horizontally, and vertically as shown by the chain double-dashed line in FIG. The movement restrictions are lifted in the upright position. Further, reference numeral 9 in the figure denotes a movement knob for manually operating the movement of the movement clamp 1B.

The heater 2 is formed so that the tubular ends of the thermoplastic resin molded products P and J can be heated. Further, the heater 2 is disposed laterally of the fixed clamp 1A and the movable clamp 1B and is pivotally attached to the base 6, and is held by the movable clamp 1B and the tubular end held by the fixed clamp 1A. When the used end (the position indicated by the chain double-dashed line in FIG. 3) in which the tubular end thus made can be heated and the tubular end held by the fixed clamp 1A and the tubular end held by the moving clamp 1B are butted against each other, It is provided so as to be capable of reciprocating between a standby position (a position shown by a solid line in FIG. 3) that does not cause an obstacle. Further, the use position is such that the center of the heater 2 is arranged on the axis of the tubular end.

The heater 2 is preferably a cartridge type, but may be a cast type. Also, about 5
The temperature can be arbitrarily set up to a height of 00 degrees, and a uniform temperature distribution is preferable.

The spacer 3 is formed such that the thickness of the tubular end held by the fixed clamp 1A and the movable clamp 1B in the direction parallel to the axial direction is 2 mm thicker than that of the heater 2. Further, the spacer 3 is axially attached to a base 6 arranged on the side of the fixed clamp 1A and the movable clamp 1B (on the side opposite to the heater 2), and is gripped by the fixed clamp 1A. The use position (the position shown by the solid line in FIG. 3) where the tubular end held by the movable clamp 1B can abut the tubular end held by the movable clamp 1B, and the tubular end held by the fixed clamp 1A and the movable clamp 1B are fixed. It is provided so as to be able to reciprocate between a waiting position (a position indicated by a chain double-dashed line in FIG. 3) that does not cause an obstacle when the gripped tubular end is abutted. In the figure, 10 is a spacer set knob for manually operating the spacer 3.

Further, the heater 2 and the spacer 3 are
The centers in the thickness direction are positioned so as to be arranged on the same plane.

The clamping motor 4 is a forward / reverse rotation type motor, which moves the moving clamp 1B in the abutting direction during the forward rotation and moves the moving clamp 1B in the separating direction during the reverse rotation.

The heater motor 5 is a forward / reverse rotation type motor, which moves the heater 2 forward from the standby position to the use position at the time of forward rotation, and moves the heater 2 backward from the use position to the standby position at the time of reverse rotation. It has become.
It is preferable that the heater motor 5 can be moved between the standby position and the use position within one-half 0.5 second.

Although not shown in FIGS. 1 to 3, the fusion machine of this embodiment further includes a control circuit 11 for controlling the clamp motor 4 and the heater motor 5. It is provided.

Explaining the control circuit 11, the control circuit 11 has a timer 12 as shown in the block diagram of FIG. 4, a start switch 13 and a reset switch 14, and a clamp approach side limit switch 15. And limit switch 1 on the side of clamp separation
6, the heater use side limit switch 17 and the heater standby side limit switch 18 are used to control the clamp motor 4 and the heater motor 5 and the indicator lamp 19 based on signals input from the heater use side limit switch 17 and the heater standby side limit switch 18.

The start switch 13 is a switch that is turned on by an operator when the fusion work of the tubular ends is automatically performed.

The reset switch 14 is turned on by a worker when the state of the indicator lamp 19 and the position of the movable clamp 1B are automatically returned to the state before the fusion work after the fusion work of the tubular ends is completed. It is a switch.

Clamp approaching side limit switch 15
Corresponds to the abutting state detecting means in the claims, and from the position where the movable clamp 1B abuts the tubular end on the spacer 3 provided at the use position (the position shown by the solid line in FIG. 2). The spacer 3 is provided at a position to be inserted when the spacer 3 is moved in the butting direction by a distance slightly longer than the thickness of the spacer 3. Further, the moving distance between them is such that even if the tubular end gripped by the fixed clamp 1A and the tubular end gripped by the movable clamp 1B are melted and become a little shorter in the longitudinal direction, the tubular ends are pushed with an optimum pressure. It is designed so that they can be fused together, and the thickness of spacer 3 is about 1 to 5 m.
It can be arbitrarily set within the range in which m is added. The moving distance is preferably about 2 mm, but the molten state varies depending on the diameter of the tubular end and so is appropriately set.

The clamp separation side limit switch 16
Means that the movable clamp 1B is a distance (initially set distance) slightly longer than the thickness of the spacer 3 from the position where the clamp approach side limit switch 15 is turned on (the position shown by the chain double-dashed line in FIG. 2). It is provided at a position where it is thrown in when moved in the separating direction.

The heater use side limit switch 17
Is provided at a position where the heater 2 is turned on when the heater 2 moves from the standby position side to the use position.

The heater standby side limit switch 18
Is provided at a position where the heater 2 is turned on when the heater 2 moves from the use position side to the standby position.

The marking lamp 19 is a fixed clamp 1A.
It lights up when the fusion of the tubular end gripped by and the tubular end gripped by the moving clamp 1B is completed.

Next, based on the flowchart of FIG.
The operation flow of the control circuit 11 will be described.

In step 101, the start switch 13
Is a step to determine whether or not
If YES, the process proceeds to step 102, and if NO, step 101
repeat.

In step 102, the heater motor 5 is used.
This is the step of starting the normal rotation of.

Step 103 is a step for determining whether or not the heater-use side limit switch 17 is turned on. If YES, the process proceeds to step 104, and if NO, step 103 is repeated.

Step 104 is the heater motor 5
This is the step of stopping the normal rotation of.

Step 105 is a step of starting the timer 12.

Step 106 is a step of determining whether or not a set time has elapsed since the timer 12 was started. If YES, the process proceeds to step 107, and if NO, step 106 is repeated.

Step 107 is a step of resetting the timer 12 and starting reverse rotation of the heater motor 5.

Step 108 is a step for determining whether or not the heater standby side limit switch 18 is turned on. If YES, the process proceeds to step 109, and if NO, step 108 is repeated.

Step 109 is for the heater motor 5
This is a step of stopping the reverse rotation of and the normal rotation of the clamping motor 4.

Step 110 is a step of determining whether or not the clamp approaching side limit switch 15 is turned on. If YES, the process proceeds to step 111, and if NO, step 110 is repeated.

Step 111 is for the clamping motor 4
Normal rotation. This is the step to stop.

Step 112 is a step of starting the timer 12.

Step 113 is a step of determining whether or not the set time has elapsed since the timer 12 was started. If YES, the process proceeds to step 114, and if NO, step 113 is repeated.

Step 114 is a step of resetting the timer 12 and turning on the marking lamp 19.

In step 115, the reset switch 14
Is a step to determine whether or not
If yes, go to step 116; if no, go to step 115
repeat.

Step 116 is for the clamping motor 4
This is a step of stopping the reversal of No. and turning off the marking lamp 19.

Step 117 is a step for determining whether or not the clamp separation side limit switch 16 is turned on. If YES, the process proceeds to step 118, and if NO, step 117 is repeated.

Step 118 is the clamp motor 4
Is a step of stopping the reversal of.

The control is terminated after the above flow is completed.

Next, the operation of the first embodiment will be described. When the tubular end of the thermoplastic resin molded product P and the tubular end of the thermoplastic resin molded product J are butt-welded together using the fusion machine of the present embodiment, first, the thermoplastic resin molded product J is The fixed clamp 1A is gripped and fixed, and the thermoplastic resin molded product P is fixed by gripping the tubular end of the movable clamp 1B. At this time, the thermoplastic resin molded product J to be gripped by the fixed clamp 1A is positioned so that the tubular end abuts on the spacer 3 when the spacer 3 is placed at the use position.

Next, with the stopper knob 8 in the released state (the state shown by the chain double-dashed line in FIG. 1), the movable clamp 1B is moved in the direction approaching the fixed clamp 1A by the moving knob 9, and the movable clamp 1B is placed at the use position. The tubular end held by the fixed clamp 1A is brought into contact with the spacer 3 thus provided. The tubular end gripped by the fixed clamp 1A comes into contact with the spacer 3 when the spacer 3 is placed in the use position.
Thus, the tubular end of the thermoplastic resin molded product P and the tubular end of the thermoplastic resin molded product J are in contact with the spacer 3.

Next, the spacer 3 is moved from the use position to the standby position by the spacer set knob 10, and the start switch 13 is turned on. At this time, the heater 2 needs to be heated to an appropriate temperature in advance.

When the start switch 13 is turned on, the heater 2 first moves from the standby position to the use position. A gap of 1 mm is formed between the heater 2 provided at the use position and each tubular end due to the difference between the thickness of the heater 2 and the thickness of the spacer 3. Then, after a predetermined time (during which the tubular end is heated and melted by the heater 2), the heater 2 moves from the use position to the standby position, and the thickness of the spacer 3 moves in the direction in which the moving clamp 1B approaches the fixed clamp 1A. It moves a little longer than this, and the tubular ends fuse together. Since the distance that the movable clamp 1B moves during this fusion is determined by the position of the clamp approaching side limit switch 15, the tubular ends are fused with an optimum butt pressure.

Then, after a predetermined time, the indicator lamp 19 is turned on, so that the thermoplastic resin molded products J and P having the tubular ends joined are removed from the fixed clamp 1A and the movable clamp 1B, and the reset switch 14 is turned on.

When the reset switch 14 is turned on, the movable clamp 1B moves in a direction away from the fixed clamp 1A to a position immediately before the start switch 13 is turned on.

By the above operation, the butt fusion of the tubular ends is completed. The time required for the heater 2 to move from the use position to the standby position and to fuse the tubular ends with each other at a predetermined butt pressure is preferably within 5 seconds, and preferably within 1 second.

Further, since the movable clamp 1B returns to the position immediately before the start switch 13 is turned on, when the butt fusion of the tubular ends is repeatedly performed, from the next time,
It suffices to start by turning on the start switch 13.

That is, in the fusion machine of the present embodiment, when the tubular end held by the fixed clamp 1A and the tubular end held by the moving clamp 1B are heated by the heater 2, the tubular end and the heater 2 are separated from each other. Since it is possible to keep a constant interval between them, it is possible to stabilize the fused state of the tubular ends and prevent beads from being generated during heating.

Further, when the start switch 13 is turned on, the tubular ends are automatically abutted and fused to each other with a predetermined pressure, so that the operator's hand can be prevented from bothering. Therefore, it is possible to prevent variations in the butt pressure and to stabilize the fusion strength, that is, to improve the reliability of the joint.

Next, the fusion machine according to the second embodiment will be described with reference to FIGS. In describing the present embodiment, the same components as those in the first embodiment will be designated by the same reference numerals in the drawings and will not be described.

The fusion machine of this embodiment is shown in FIG.
As shown in the plan view of FIG. 7, a difference from the first embodiment is that a pressure sensor 20 is provided as the abutting state detecting means.

The pressure sensor 20 is a fixed clamp 1A.
Abutment pressure between the tubular end of the thermoplastic resin molded product J held by the fixed clamp A and the tubular end of the thermoplastic resin molded product P held by the moving clamp 1B. Can be detected.

The butt pressure detected by the pressure sensor 20 is input to the control circuit 11A as shown in FIG. 8, which is shown in FIG.
It operates according to the flow shown in the flow chart.

Regarding the flow of the operation of the control circuit 11, steps 101 to 109 and step 1
11 to step 118 are the same as those in the first embodiment, the description thereof will be omitted, and only step 119 will be described.

In step 119, the butt pressure F ₀ detected by the pressure sensor 20 is the preset butt pressure F.
In the step of determining whether or not the above is true, the process proceeds to step 111 if YES, and step 110 is repeated if NO.

That is, in the fusion machine of this embodiment, when the tubular end held by the fixed clamp 1A and the tubular end held by the moving clamp 1B are abutted against each other with a predetermined pressure, the moving clamp 1B is stopped. Therefore, the tubular ends can be automatically butt-welded to each other with a predetermined butt pressure. Therefore, it is possible to prevent the operator's hand from being bothered, it is possible to prevent variations in the butting pressure, and it is possible to stabilize the fusion strength, that is, to improve the reliability of the joint portion.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention.

For example, in the drawings showing the embodiments, the case where the thermoplastic resin molded product held by the fixed clamp is a joint and the thermoplastic resin molded product held by the moving clamp is a pipe is shown. It can be used for various purposes such as joining pipes together, joining pipes and flanges, and the like, not only joining pipes and joints. Further, which clamp is used to grip which thermoplastic resin molded product can be arbitrarily set.

Furthermore, in the examples, the method of heating the tubular end of the thermoplastic resin molded product in a state where it is not in contact with the heater is shown, but it may be heated by contacting it with the heater.

Further, in the embodiment, when the butt fusion is completed, the indicator lamp is turned on to notify the operator, but the buzzer may be used to notify the operator.

Further, a drive device for moving the spacer may be provided so that the spacer also automatically moves.

[0072]

As described above, in the fusion machine of the present invention and the butt fusion method using the fusion machine, the tubular end held by the first clamp and the second end. Since the tubular end held by the clamp can be automatically abutted with a predetermined pressure, the operator's hand can be prevented from being bothered, and the tubular ends of the thermoplastic resin molded product can be abutted and fused. It is possible to prevent variations in the butting pressure at the time of attachment and to stabilize fusion strength, that is, to improve the reliability of the joint.

[Brief description of drawings]

FIG. 1 is a side view showing a fusion machine according to a first embodiment.

FIG. 2 is a plan view showing a fusion machine of the first embodiment.

FIG. 3 is a front view showing the fusion machine of the first embodiment.

FIG. 4 is a block diagram of the fusion machine according to the first embodiment.

FIG. 5 is a flowchart showing an operation flow of a control circuit provided in the fusion machine of the first embodiment.

FIG. 6 is a side view showing a fusion machine according to a second embodiment.

FIG. 7 is a plan view showing a fusing machine according to a second embodiment.

FIG. 8 is a block diagram of a fusion bonding machine according to a second embodiment.

FIG. 9 is a flowchart showing an operation flow of a control circuit provided in the fusion machine of the second embodiment.

[Explanation of symbols]

 1A Fixed clamp 1B Moving clamp 2 Heater 3 Spacer 4 Clamp motor 5 Heater motor P Thermoplastic resin molded product J Thermoplastic resin molded product

Claims (2)

[Claims] 1. A first clamp and a second clamp formed so as to be able to grip the tubular end of the thermoplastic resin molded product, and a heater formed so as to be able to heat the tubular end of the thermoplastic resin molded product. The second clamp is connected to the first clamp.
Is movably provided in a butting direction in which the tubular end held by the clamp and the tubular end held by the second clamp are butted, and the heater is provided with the tubular end held by the first clamp and the tubular end held by the first clamp. A use position where the tubular end held by the second clamp can be heated, and a standby position where no obstacle is caused when the tubular end held by the first clamp and the tubular end held by the second clamp are abutted against each other In a fusion machine that is reciprocally movable between the second clamp and the clamp drive device that moves the second clamp in the butting direction, the tubular end held by the first clamp, and the second end.
A butting state detecting means for detecting the butting pressure optimum state in which the tubular end held by the clamp is butted at a predetermined pressure, and the butting state detecting means detects the butting pressure optimum state. And a control circuit for stopping the operation of the clamp driving device. 2. A butt fusion method using a fusion machine according to claim 1, wherein the first clamp holds the tubular end of the thermoplastic resin molded product, and the second clamp holds the thermoplastic end. The tubular end of the thermoplastic resin molded product held by the first clamp and the tubular end of the thermoplastic resin molded product held by the second clamp are arranged at the use position. Heat with the heater to melt, then
After the heater is moved from the use position to the standby position, the second clamp is moved by the clamp drive device until the matching state detection means detects the optimum matching pressure state under the control of the control circuit. After the state detecting means detects the optimum butt pressure state, the operation of the clamp driving device is stopped, and thus the tubular end held by the first clamp and the tubular end held by the second clamp are separated. A butt fusion method, which comprises butting and fusing in a molten state.