JPH06297582A - Welding machine - Google Patents

Abstract

PURPOSE:To provide a welding machine capable of surely performing the weld- connection of a pipe and a joint even when both of them are non-uniform in wall thickness. CONSTITUTION:A position adjusting mechanism (up-and-down and left-and-right moving mechanisms 5, 6) for altering the position of either one of a pair of clamps 3 grasping a pipe and a joint in the direction crossing the grasping center axis of the clamp 3 orthogonally with respect to a base stand is provided to the clamp 3 to perform the centering of the pipe and the joint grasped by a pair of clamps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion machine for fusion-bonding a synthetic resin pipe and a joint. More specifically, for example, a composite in which an FRP layer is formed on the outer peripheral surface of an inner pipe made of vinyl chloride. The present invention relates to a fusing machine suitable for connecting a pipe and its joint.

[0002]

2. Description of the Related Art As a fusion machine used for connecting synthetic resin piping materials, for example, a pipe and a joint are respectively held by a pair of clamps, and a heater face is used for each joint surface of the pipe and the joint. After heating and melting by heating, the respective clamps are moved relatively to each other to bring them closer to each other, thereby bringing their joint surfaces (melting portions) into contact with each other to perform fusion bonding (for example, Japanese Patent Laid-Open No. 61- No. 254332).

Further, as a clamp of this type of fusion bonding machine, a clamp member having a V-shaped clamping port is generally used and a mechanism for clamping the outer peripheral surface of a pipe or a joint is generally used.

[0004]

By the way, according to the conventional fusion bonding machine, there is no problem in connecting the pipe material of the single molded product of the synthetic resin (vinyl chloride etc.). Therefore, when connecting a composite pipe in which FRP is laminated on the outer circumference of a vinyl chloride pipe and its joint, a problem occurs.

That is, since a vinyl chloride pipe (single pipe) is processed by extrusion molding or the like, its wall thickness is always constant and there is no center misalignment between the pipe outer diameter and the inner diameter. It is difficult to make the wall thickness constant due to a problem in molding the reinforcing FRP, and uneven thickness is inevitable. Therefore, if such a composite pipe is simply supported by the above-described clamp having a general structure, a problem occurs that the pipe and the joint are misaligned due to the uneven thickness. However, it is impossible for the conventional fusion machine to eliminate it, and therefore, when the pipes and joints for connection have an uneven thickness, there is a problem that fusion bonding becomes incomplete.

The present invention has been made in view of such circumstances, and an object of the present invention is to reliably perform fusion-bonding of pipes and joints for connection even if they have uneven thickness. It is to provide a fusion machine.

[0007]

A structure for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to an embodiment. One of a pair of clamps 2 and 3 (joint clamp 3) which are arranged to face each other and are capable of relative movement in directions toward and away from each other, in a direction orthogonal to the moving direction of the clamp 3. This is characterized by providing a position adjusting mechanism (up / down / forward / backward moving mechanisms 5 and 6) for changing the position of the relative to the base 1.

[0008]

[Operation] Connect the pipe P and the joint J for connection to the clamps 2, 3
When there is a misalignment between the pipe P and the joint J in the respective gripped states, the misalignment is eliminated by changing the position of the clamp 3 with respect to the base 1 by operating the position adjusting mechanisms 5 and 6. it can.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, the schematic structure of the fusion machine will be described with reference to the perspective view shown in FIG.

The pipe clamp 2 and the joint clamp 3 individually hold the pipe (composite pipe made of synthetic resin) to be fusion-bonded and the joint thereof, and are arranged on the base 1 so as to face each other. ing. A heater 4 is arranged on the base 1 at a position between the pair of clamps 2 and 3.

The clamps 2 and 3 are tightening mechanisms 20 and 3, respectively.
It is supported on the pedestals 2a and 3a through 0, and the clamps can be tightened and opened by rotating the handles 21a and 31a of the tightening mechanism. Note that the pipe clamp 2 has a structure for holding the pipe by two-point support in consideration of the case where the pipe to be connected is long.

The pedestal 2a of the pipe clamp 2 is slidably arranged on guides 1a and 1b extending along the longitudinal direction of the base 1 (the central axis direction of the clamp), and the joint clamp 3 is also provided. The gantry 3a is slidably disposed on guides 1c and 1d (see FIG. 3) that also extend along the longitudinal direction of the base 1 via a vertical movement mechanism 5 described later. Therefore, the joint clamp 3 and the pipe clamp 2 can be relatively moved toward and away from each other, and the movement of each of the clamps 2 and 3 is performed by the hydraulic cylinder 7 (the joint clamp side is not shown). ) By the operation described later.

On the other hand, in the heater 4, as shown in FIG.
A heater surface 4a for pipes for heating the outer peripheral surface of the connecting portion P1 of the pipe P to be connected and a heater face 4b for joints for heating the inner peripheral surface of the joint portion J1 of the joint J are mounted. Also, one end of the heater 4 is rotatably supported by the base 1 by a support mechanism (not shown), and the heater 4 is used from the standby position (the standing state shown in FIG. 1) by the rotating operation. It can be placed in a position (horizontal state shown in FIG. 4). Further, an adjustment mechanism 4c for centering the heater face at the use position is provided at the tip of the heater 4. In addition, each heater face 4a, 4b
Can be replaced according to the diameter of the pipe / joint to be connected.

What should be noted in the embodiment of the present invention is that the joint clamp 3 is provided with the vertical movement mechanism 5 and the front-back movement mechanism 6 as shown in FIGS.
The vertical movement mechanism 5 includes a mounting table 5a slidably arranged on the guides 1c and 1d, wedge block pairs 52 and 53 arranged on the table so as to face each other, and a feed screw rod 51. , Bearings 54a, 5 rotatably supporting both ends thereof
4b.

Each of these wedge-shaped block pairs 52, 53
Is a pair of blocks composed of moving wedges 52a and 53a and fixed wedges 52b and 53b that come into contact with their respective slopes,
The movable wedges 52a and 53a are slidably arranged on the mounting table 5a, and the feed screw rod 51 is screwed therein. On the other hand, the fixed wedges 52b and 53b
Has its upper surface only fixed to the lower surface of the base 3a of the joint clamp, is not connected to the feed screw rod 51, and can be vertically displaced with respect to the mounting table 5a. . Also, all of these wedges 52a ... 5
3b is a stopper 55a, 5 provided on the left and right sides of the stopper 3a.
Movement in directions other than the direction orthogonal to the guides 1c and 1d is restricted by 5b (see FIG. 2).

The feed screw rod 51 includes movable wedges 52a and 5a.
3a is a screw that goes in the opposite direction, and the feed screw rod 51 has a bearing 54
The position with respect to the mounting table 5a is fixed by a and 54b. Therefore, in the vertical movement mechanism 5, when the feed screw rod 51 is rotated, the moving wedges 52a and 53a come close to or away from each other, which causes the fixed wedges 52b,
53b is simultaneously displaced in the vertical direction, and the pedestal 3a above it is displaced.
That is, the joint clamp 3 moves in the vertical direction. In addition,
The vertical movement of the clamp rises when the feed screw rod 51 is rotated rightward by the operation of the handle 51a inserted into the head of the feed screw rod 51, and lowers when the feed screw rod 51 is rotated in the opposite direction.

On the other hand, the tightening mechanism 30 for the clamp 3 for the joint.
The feed screw rod 31 is supported slidably in the axial direction with respect to the pedestal 3a, and its axial movement is given by the front-back movement mechanism 6.

The forward-backward moving mechanism 6 is rotatably supported by a bearing 64 supported by the pedestal 3a, and the feed screw rod 61 is supported while the axial movement thereof is restricted, and the feed screw rod 61. And a feed screw rod 31 of the tightening mechanism 30. The connecting rod 6
One end of 2 is screwed into the feed screw rod 61, and the other end is rotatably supported by the feed screw rod 31. However, the axial position of the connecting rod 62 with respect to the screw rod 31 is fixed.

Therefore, in the forward / backward moving mechanism 6, when the feed screw rod 61 is rotated, the connecting rod 62 is fed, whereby the feed screw rod 31 on the tightening mechanism side slides, and the feed screw rod 31 slides. The entire joint clamp 3 is displaced in the front-rear direction (horizontal direction orthogonal to the guides 1c and 1d). The forward and backward movement of the clamp is performed by the handle 61 inserted into the head of the feed screw rod 61.
When the feed screw rod 61 is rotated rightward by the operation a, the feed screw rod 61 moves forward, and by the reverse rotation operation, it moves backward.

Next, the operation of the embodiment of the present invention will be described together with the procedure of fusion bonding. First, before starting the fusion bonding, the heater 4 is driven to preheat the heater faces 4a and 4b to the working temperature.

Next, the pipe P and the joint J are gripped by the pipe clamp 2 and the joint clamp 3, respectively, and in this state, the pair of clamps 2 and 3 are moved (advanced) in directions toward each other, Check whether the pipe P and the joint J have the same core. At this time, if there is a misalignment between the pipe P and the joint J, for example, if there is a misalignment due to an uneven thickness of the pipe P or the joint J, the vertical movement mechanism 5 of the joint clamp 3 and the front-rear direction. One or both of the moving mechanisms 6 is operated to align the center of the joint J side with the center of the pipe P side to perform centering, and after the centering is completed, the clamps 2 and 3 are separated from each other. Move it back in the direction you want it to stand and wait at that position.

Next, the heater 4 is moved from the standby position to the use position, and in this state, the clamps 2 and 3 are moved forward and temporarily stopped at the position before the heater faces 4a and 4b. At this point, The tube P and the joint J are aligned with the heater faces 4a and 4b. The position adjustment at this time is performed by operating the adjustment mechanism 4c on the heater 4 side. After that, the clamps 2 and 3 are advanced again, and the joints P1 and J1 of the pipe P and the joint J are fitted into the heater faces 4a and 4b, respectively, as shown in FIG.
The outer peripheral surface and the inner peripheral surface are heated for a predetermined time (melting time).

Then, the clamps 2 and 3 are retracted by a predetermined distance to connect the pipe P and the joint J to the heater faces 4a and 4b.
Then, after moving the heater 4 back to the standby position by moving the heater 4, the clamps 2 and 3 are moved forward to insert the joint P1 of the pipe P into the joint J, and from this time, a fixed time (of the joint The fusion bonding is completed when the solidification time) elapses.

In the embodiment of the present invention described above, the vertical / forward / backward moving mechanisms 5 and 6 as the position adjusting mechanism for centering are provided on the joint clamp 3 side, but the moving mechanism is the pipe clamp 2 side. May be provided. However, since the pipe to be connected is longer, it is preferable to provide the vertical / forward / backward moving mechanisms 5 and 6 on the joint clamp 3 side in consideration of the workability of centering.

In the above embodiments, the vertical and forward / backward moving mechanisms 5 and 6 are mechanisms using feed screws. However, in addition to this, general rotary-linear motion such as a cam mechanism or a gear combination mechanism is used. A conversion mechanism may be used.

[0026]

As described above, according to the fusion machine of the present invention, the position adjusting mechanism is provided in either one of the pair of clamps for holding the pipe and the joint for fusion bonding, and the clamp is used. Since the position in the direction orthogonal to the gripping central axis of is configured to be changeable with respect to the base, for example, when connecting the composite pipe in which the outer circumference of the vinyl chloride pipe is reinforced with the FRP layer and its joint, Even if there is uneven thickness in the pipes and joints,
Both can be easily aligned. As a result, the reliability of fusion bonding is improved.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a schematic structure of an embodiment of the present invention.

FIG. 2 is a front view of a main part showing a structure around a clamp 3 for a joint of the embodiment.

FIG. 3 is a plan view of an essential part showing the structure around the clamp 3 for joints.

FIG. 4 is a side view taken along the arrow A in FIG.

FIG. 5 is a diagram showing a structure of heater faces 4a and 4b according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... ・ Base 1a-1d ... Guide 2 ... Pipe clamp 3 ... Joint clamp 5 ... Vertical movement mechanism 6 ... Forward / backward movement mechanism 4 ...・ Heaters 4a, 4b ・ ・ ・ ・ Heater face P ・ ・ ・ ・ Pipe J ・ ・ ・ ・ Joint

Claims (1)

[Claims] 1. A device for connecting a synthetic resin pipe and a joint, the pair of clamps being arranged on a base so as to face each other and capable of relative movement in directions toward and away from each other. In the state of gripping the pipe and the joint, respectively, after heating and melting the respective joint surfaces thereof, in the fusion machine configured to bring the respective melted portions into contact by moving to the approach side of the clamps, One of the pair of clamps is provided with a position adjusting mechanism for changing the position of the clamp in the direction orthogonal to the moving direction with respect to the base, and the fusion bonding is characterized in that Machine.