JPH10309751A - Extrusion welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable movement of a gun main body in conformity with a speed of extrusion of a molten resin material, to make a welding width and the like prescribed and thereby to reduce nonuniformity in a welding strength by a method wherein running rollers driven by a driver and designed for moving the gun main body in a floated state are provided in the vicinity of the fore end of an extruding metal fitting. SOLUTION: This extrusion welding machine 1 is equipped with a gun main body 2 extruding a molten resin material B prepared by melting thermoplastic resin and a running implement 3 moving this gun main body 2. Herein a juncture line L of two thermoplastic resin sheets A is formed on one plane. By extruding the molten resin material B along this juncture line L, it is formed for plane welding whereby the sheets A are welded on the juncture line L. The running implement 3 is fixed removably to the gun main body 2, as an integral unit constructed by fitting a frame F with a pair of running rollers 15 disposed in the vicinity of the fore end of an extruding metal fitting 9 and with a driver M2 being a motor or the like for driving these running rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion welding machine suitable for joining thermoplastic resin sheets such as waterproof sheets used for civil engineering and construction.

[0002]

2. Description of the Related Art For example, in civil engineering work sites, for ground stabilization, drainage,
2. Description of the Related Art A wide surface waterproof sheet formed by joining edges of a plurality of sheets to each other is used for protection or for a tent for forming a dome.

[0003] In joining such a waterproof sheet or the like, an extruder for extruding a heated molten thermoplastic resin material from a nozzle port as disclosed in, for example, Japanese Utility Model Publication No. 56-48613 is disclosed. Used, for example, as shown in FIG. 7A, a joining line L of sheets A, A with their ends joined together.
In general, the molten resin material B is extruded along the sheet A to weld the sheets A.

However, in the conventional extruder, since the extruder is manually moved along the alignment line L, the moving speed becomes uneven, and as a result, as shown in FIG. However, even when the extrusion speed of the molten resin material B is constant, the welding strength and the welding width vary, and the welding strength varies, making uniform and reliable welding difficult.

Accordingly, the present invention is based on the provision of a traveling roller driven by a driving machine near the tip of an extrusion fitting for extruding a molten resin material, and the gun body can be moved in accordance with the extrusion speed of the molten resin material. It is an object of the present invention to provide an extrusion welding machine which can stabilize a welding width and the like and can perform high-quality joining while suppressing variations in welding strength.

[0006]

In order to achieve the above object, the present invention provides a gun body having an extrusion fitting for extruding a molten resin material in which a thermoplastic resin is melted, and comprising a plurality of thermosetting resin materials. An extrusion welding machine for extruding the thermoplastic resin sheet at the joining line by extruding the thermoplastic resin sheet along the joining line, wherein the extruding welding machine is driven by a driving machine near the tip of the extrusion fitting and floats the gun body. It features a traveling roller for movement.

The extrusion welding machine includes a first adjusting device capable of adjusting the extrusion speed and the melting temperature of the molten resin material, and a second adjusting device capable of adjusting the traveling speed of the traveling roller. This makes it possible to freely change the welding width and the welding speed in accordance with the welding operation while keeping the welding width constant.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, the extrusion welding machine 1 includes a gun body 2 for extruding a molten resin material B in which a thermoplastic resin is melted, and a traveling tool 3 for moving the gun body 2, and in this example, two sheets are used. A joining line L of the thermoplastic resin sheet A (hereinafter referred to as a sheet A) is formed on one plane, and by extruding the molten resin material B along the joining line L, a joining line L is formed between the sheets A and A. Is formed as flat welding.

The matching line L is, for example, as shown in FIG.
As shown in FIG. 7A, a butt portion formed by abutting the ends Ae of the sheet A, or as shown in FIG.
A is formed as an upper end Ae in a portion where A is overlapped up and down.

The gun body 2 of the extrusion welding machine 1 is in the form of a pistol having a grip portion 6 at the rear end of a body portion 5, and a trigger-like switch SW is disposed on the grip portion 6.

The body 5 has a heating and melting section 7 for heating and melting a thermoplastic resin supplied as a solid body such as a rod or a granule and forcing it forward. And an extrusion fitting 9 extruded from the nozzle port 9A. As the thermoplastic resin, a known thermoplastic resin such as polyvinyl chloride, polyethylene, polypropylene, and polystyrene can be used. Preferably, the same material as the sheet A is used in order to increase the welding strength.

The heating and melting section 7 includes a screw shaft 10 connected to a driving device M1 such as a motor, and an outer tube 11 for extrapolating the screw shaft 10, and a rear end side wall of the outer tube 11. In addition, a supply port 12 for the thermoplastic resin is opened, and a heating tool 13 for heating and melting is connected.
In this example, the heating tool 13 is a so-called hot air blower having an output of, for example, about 2 kW, and the inside of the outer tube 11 is heated to a melting temperature of 60 to 600 mm by hot air sent from a connection portion.
Degree, for example, about 200 to 250 degrees. Therefore, the heating and melting unit 7 is supplied from the supply port 12,
For example, a rod-shaped thermoplastic resin is continuously pushed forward while being sequentially melted by heating with hot air and kneading of the screw shaft 10.

In the present embodiment, the extruding metal fitting 9 is a flat metal welding extruding metal fitting 9, and is formed through a tapered cone-shaped head 14 (shown in FIG. 3) projecting from the front end of the outer tube 11. It is detachably and detachably attached to the outer tube 11 using, for example, a set screw.

In the present embodiment, the extrusion fitting 9 is a rectangular block-shaped nozzle having a nozzle port 9A opened at the front end.
In this example, the material is extruded from the nozzle port 9A concentric with the screw shaft 10 at a constant extrusion speed of, for example, about 5 kg / hour.

At the front end, the gun body 2 has a sheet A
In the upright state, which is perpendicular to the sheet A, a proximity surface 30 parallel to and close to the sheet A is formed, and the proximity surface 30 has, for example, a U-shaped Groove 3 extending in a substantially constant cross-sectional shape
1 is recessed. The groove 31 is formed so that the molten resin material B discharged from the nozzle port 9A has a constant cross-sectional shape and is uniformly pressed and adhered to the sheet A, and further improvement in welding accuracy is guaranteed. Along with the standing wall,
Ensures welding on ceilings, etc. The extruding metal fitting 9 has a mounting surface 32 for fixing the running tool formed at the rear end side of the upper surface thereof at the same height as the outer tube 11 via a step 32A.

As shown in FIG. 3, the traveling tool 3 includes a pair of traveling rollers 15 disposed near the tip of the extrusion fitting 9 and a driving device M2 which is a motor for driving the traveling rollers. It forms an integral unit attached to the frame F and is detachably fixed to the gun body 2.

In this embodiment, the frame F is provided with an extrusion fitting 9.
And a substrate 16 extending rearward from the mounting surface 32, and a rising edge 16A for mounting the driver is provided at the front edge of the substrate 16. Further, the substrate 16 is fixed to the outer tube 11 while being prevented from rotating by the extrusion fitting 9 by being fixed to the extrusion fitting 9 by a nut fixed to a U-shaped fastening member 17 passing through the lower surface of the outer tube 11. It is locked so that the position can be changed. In this example, the substrate 16 is positioned in the longitudinal direction by its front edge abutting on the step 32A.

Further, the substrate 16 has a pair of side plates 19 parallel to each other on both sides thereof. In this example, the upper ends of the side plates 19 are connected by connecting pieces 20 to provide necessary frame rigidity. doing.

In the present embodiment, the running roller 15 is arranged around an axis perpendicular to the axis of the screw shaft 10.
Each side plate 19 is pivotally attached to the outer surface. Running roller 15
1 and 2, a rubber material provided on the running surface is used to prevent slippage, and as shown in FIGS.
The gun body 2 is translated in an upright state while bringing 0 and the sheet A close to each other. Here, “proximity” means that the molten resin material B from the nozzle port 9A is close to the proximity surface 30 and the sheet A
The distance between the adjacent surface 30 and the sheet A is substantially equal to or less than 2 mm, for example.

The traveling roller 15 is provided with the driving device M
2 via the drive transmission means 21. In the present embodiment, as shown in FIG. 3, the drive transmission means 21 includes a gear G1 attached to an output shaft of the driving machine M2, and the side plate 1
9 and fixed to the rotating shaft 22 extending between
, A gear G3 fixed to both ends of the rotating shaft 22, a gear G4 attached to a support shaft of the running roller 15, and a gear G5 connecting between the gears G3 and G4. The running roller 15 is rotated at a constant speed of, for example, about 1 m / min in synchronization with the driving device M2.

The extrusion welding machine 1 is connected to the gun body 2 by the driving device M1 and the heating tool 13 so that the molten resin material B
Adjuster 23 capable of adjusting extrusion speed and melting temperature of
And a second adjusting device 24 that can adjust the traveling speed of the traveling roller 15 is provided in the driving device M2. The driving devices M1, M2 and the heating device 13
Are operated in synchronization with the operation of the switch SW of the gripper 6 in this example.

As described above, since the extrusion welding machine 1 is provided with the traveling roller 15 that travels on the sheet A at a constant speed, the extrusion welding machine 1 can move at a constant speed corresponding to the extrusion speed of the molten resin material B, and weld the molten resin material B. The width and the like can be made constant, and high-quality welding can be performed while suppressing variations in welding strength.

By providing the first and second adjusters 23 and 24, the molten state of the molten resin material B can be optimized, for example, by performing welding at a low speed in a complicated welding place while keeping the welding width constant. While maintaining, the welding width and the welding speed can be freely changed according to the welding operation, and the applicable range of the welding operation can be expanded.

8 (A) and 8 (B), the joining line L is arranged along the ridge line e1 of the entrance corner Y1 and the ridge line e2 of the exit corner Y2 of the wall surface or the like. In place of the extrusion metal fitting 9 for flat welding, an extrusion metal fitting 35 for corner welding and an extrusion metal fitting 36 for corner welding are used.

As shown in FIGS. 5 (A) and 5 (B), the extruding metal fitting 35 for welding the inside corner has a sheet A, A
It has a V-shaped protruding portion 37 which intersects the adjacent surfaces 30 and 30 which are parallel and close to each other, and the nozzle port 9A is opened on the intersection line. On the crossing line, a groove 31 extending from the nozzle port 9A toward the rear side in the traveling direction is formed. When the extrusion fitting 35 advances into the entering corner Y1, the nozzle opening 9A is greatly separated from the running surface of the running roller 15 by a distance K1 toward the front side in the longitudinal direction. The mounting position of the traveling implement 3 is changed to the rear side in the longitudinal direction. Further, instead of changing the position of the traveling tool 3, the extrusion fitting 35 itself may be formed to be long. The distance K1 is about 0.71 times the contact width W of the running roller 15.

On the other hand, the extruding metal fitting 36 for welding the inside corner is used.
Has a V-shaped recess 38 at its front end, as shown in FIGS. 6 (A) and 6 (B), which intersects the adjacent surfaces 30 and 30 which are parallel to and close to the respective sheets A and A. The nozzle port 9A is opened on this intersection line. On the crossing line, a groove 31 extending from the nozzle port 9A toward the rear side in the traveling direction is formed.

In the extrusion fitting 36, the nozzle port 9
A is greatly separated from the running surface by a distance K2 to the rear side in the longitudinal direction. For this reason, in this example, the mounting position of the traveling tool 3 is changed to the front side in the longitudinal direction. Also, in order to avoid collision between the traveling tool 3 and the corner Y2 during traveling,
The gears G1, G2 and the connecting piece 20 are connected to the nozzle port 9A.
It is necessary to dispose the gears G3, G4, G5, etc., at a position further to the rear side in the longitudinal direction, so that the shortest distance K3 from the running surface to the gears G1, G2 or the connecting piece 20 is changed. With the contact width W of the traveling roller 15 being 0.7
The traveling implement 3 which is at least one time is used. Note that this traveling tool 3
Are extruded metal fittings 9 and 3 for flat welding and corner welding.
5 may be used in common.

[0028]

Since the present invention is configured as described above,
The gun body can be moved in accordance with the extrusion speed of the molten resin material, the welding width and the like can be made constant, and high-quality joining can be performed while suppressing variations in welding strength.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of an extrusion welding machine of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is an exploded perspective view showing a traveling tool together with an extrusion fitting.

FIG. 4 is a bottom view of the extrusion fitting showing the operation of the extrusion welding machine.

FIG. 5 (A) is a perspective view showing an extruding metal fitting for corner welding.
(B) is a bottom view showing the operation.

FIG. 6 (A) is a perspective view showing an extruded metal fitting for corner welding, and FIG.
Is a bottom view showing the operation.

7 (A) and (B) show a joining line L of a plastic resin sheet.
It is sectional drawing explaining.

FIGS. 8A and 8B are cross-sectional views illustrating welding of a sheet at an entrance corner and an exit corner.

FIG. 9 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 2 Gun body 9 Extrusion bracket 15 Running roller 23 First adjuster 24 Second adjuster A Thermoplastic resin sheet B Molten resin material L Joining line M2 Driver

Claims (3)

[Claims] 1. A thermoplastic resin comprising a gun body having an extrusion fitting for extruding a molten resin material in which a thermoplastic resin is melted, and extruding the molten resin material along a joining line of a plurality of thermoplastic resin sheets. What is claimed is: 1. An extrusion welding machine for welding sheets at a joining line, wherein a running roller driven by a driving device and for moving the gun body is provided near a tip of the extrusion fitting. 2. The gun body has a first adjusting device capable of adjusting an extrusion speed and a melting temperature of the molten resin material, and the driving device has a second adjusting device capable of adjusting a traveling speed of the traveling roller. 2. The adjusting device according to claim 1, wherein
The extrusion welding machine as described. 3. The extrusion welding machine according to claim 1, wherein the extrusion fitting is detachably mounted on the gun body and is exchangeable.