JPH08309860A - Sheet welding equipment - Google Patents

Abstract

PURPOSE: To weld side end parts of two heat melting sheets to each other promptly with a device held by one hand. CONSTITUTION: With a grip 2 held by one hand, the side end parts of two heat melting sheets 31, 32 are inserted between two press rollers 7, 8 along a guide member 29 to be set. In this state, when a motor 3 in a main body is actuated while hot air is ejected from a heat generator B, the rollers are rotated, and the side end parts of the sheets 31, 32 are heated by the hot air and fed between the rollers 7, 8 to be welded to each other in sequence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the welding of heat-fusible sheets, and in particular, when a water-stop sheet is continuously attached to a wall surface to be cured during the construction work of a tunnel or an underground structure, The present invention relates to a sheet welding device used for overlapping side edges of adjacent water blocking sheets in a crosswise manner and welding the portions.

[0002]

2. Description of the Related Art As a conventional sheet welding apparatus of this kind, there are a sheet welding apparatus which uses a heating iron as a medium for heating a sheet of a heat-melting resin and a sheet which uses hot air. The heating trowel is brought into direct contact with the two sheets to heat and melt the surface. After that, these parts are pressed against each other by a pressure roller and welded. Further, hot air is blown from the hot air blowing nozzle onto the surface of the thermoplastic resin sheet, as described in, for example, Japanese Utility Model Publication No. 60-107199.
The surface is heated to melt. Then, as described above, welding is performed by the pressure roller.

[0003]

When using the above-mentioned heating trowel or those using hot air, when carrying out the work, one hand has the heating trowel or the hot air generator, and the other hand has the pressure roller. Since it is necessary to carry it while holding it, workability is poor, for example, if the overlapping portion of the two sheets is misaligned or one of the sheets wrinkles, remove either the heating means or the pressure roller, It is necessary to correct the sheet misalignment and wrinkles. Therefore, there is a problem that the original crimping work is interrupted and the working time becomes long.

There are some cases where the heating means and the pressure roller are attached to one traveling carriage or a two-handed supporting base (see, for example, Japanese Utility Model Publication No. 3-51141 and Japanese Utility Model Publication No. 2-43713). The entire device is large and heavy, and the one attached to the traveling carriage is limited to work on level ground, and cannot be used, for example, when attaching a waterproof sheet to the inner surface of a tunnel. Since one operator's both hands are used for running the vehicle and supporting the support base, only one operator can correct the above-mentioned sheet misalignment and wrinkles without interrupting the crimping work. There is a problem that you cannot do it.

In welding two sheets of this kind,
Two heat-welded portions are formed in the overlapping portions of the side edges of two adjacent sheets, one end of the unwelded portion formed between them is closed, and compressed air is sent from the other end. Whether or not there is a defect in the heat-welded portion can be determined depending on whether or not the pressure of the enclosed compressed air decreases.

As described above, since the unwelded portion is formed between the two heat-welded portions, in the apparatus disclosed in Japanese Utility Model Laid-Open No. 60-107199, the hot air blown from the nozzle is unwelded. Therefore, the nozzle structure is complicated.

In order to prevent the above-mentioned unwelded portion from partially welding, there is one in which a long spatula-shaped member is inserted into the unwelded portion, but the spatula itself is exposed to hot air. When heated, it acts in the same manner as a heating iron and has the opposite effect, or when the sheet is attached to the apparatus, the sheet and other objects may come into contact with the spatula and break the spatula.

Further, since the hot air temperature of such a sheet welding apparatus is low at the time of starting, it is necessary to preheat the hot air generating apparatus so that the sheet welding work is not started by the hot air of this low temperature. The hot air nozzle must be retracted. There is a demand for a mechanism that sets the hot air nozzle to the working position quickly and accurately when the hot air nozzle is set at the retracted position and reaches a predetermined temperature.

An object of the present invention is to allow an operator to support one hand and to perform work quickly, and to join side edges of two heat-meltable sheets by two welded portions.
It is an object of the present invention to provide a sheet welding apparatus having a simple structure in which a non-welded portion can be surely left in the middle and the hot air nozzle can be retracted at the time of starting.

[0010]

According to the present invention, the above problems can be solved as follows. (1) The left and right 1
A pair of pressure rollers are provided, both pressure rollers are rotated by a motor provided in the main body, and two heat-meltable sheets are superposed between the two pressure rollers at the top of the main body. A guide member for guiding so as to be incorporated and a hot air generating device for blowing hot air toward a portion which is superposed by both pressure rollers between the both sheets are provided.

(2) In the above item (1), each of the left and right pressure-bonding rollers has a plurality of roller portions which are separated from each other in the front and rear by providing a space between them, and a nozzle for blowing hot air in the hot air generator. Has a flat shape in the front-back direction in which hot air is blown out not only to the portion corresponding to the roller portion of the both pressure-bonding rollers but also to the portion corresponding to the void portion.

(3) In the above item (1) or (2), a rotation for supporting the hot air generator between the main body and the hot air generator so that the hot air generator can be rotated about a horizontal axis that faces the left-right direction. Provide a mechanism.

(4) In any one of the above items (1) to (3), a forward / backward moving mechanism is provided between the main body and the hot air generator so as to support the hot air generator so as to be movable in the front-rear direction.

(5) In any one of the above items (1) to (4), a rotating mechanism is provided between the main body and the hot air generator so as to support the hot air generator so as to be rotatable about its central axis. .

(6) In any one of the above items (1) to (5), the main body is provided with adjusting means for adjusting the axial distance between the left and right pressure roller.

[0016]

The grip is gripped with one hand, and the side edges of the two heat-welded sheets are mounted so as to be sandwiched between the pressure-bonding rollers along the guide member. In this state, hot air is blown from the heat generator. When the motor in the main body is operated while being blown out, both pressure bonding rollers are rotated, and the side edges of the two sheets are heated by hot air and are fed between both pressure bonding rollers to be sequentially welded. go.

[0017]

1 is a side view of an embodiment of the present invention.
This sheet welding apparatus is provided on the front upper part of a grip (2) having a trigger-like switch (1), and a main body (A) having a substantially pistol shape together with the grip (2) and an upper part of the main body (A). And a hot air generator (B) provided in the.

In the main body (A), a motor (3) and a reduction gear mechanism (4) connected to an output shaft (not shown) of the motor (3).
And are built in.

On the outer surface of the main body (A), a horizontal rod-shaped preliminary grip (5) (see also FIG. 4) is provided, and either the grip (2) can be held by one hand or both grips (2) (5). ) Can be held with both hands to support the sheet welding apparatus.

The reduction gear mechanism (4) has a pair of left and right output shafts (6a) and (6b) (see also FIGS. 3 and 4) which project forward from the main body (A). The output shafts (6a) and (6b) are rotated inwardly at the same speed by the motor (3).

Two roller portions are provided at the front ends of these output shafts (6a) and (6b) and are provided with gaps (7c) and (8c) between them, which are separated from each other in the front-rear direction.
A pair of left and right pressure bonding rollers (7) having (7a) (7b) (8a) (8b)
(8) is fixed.

As shown in FIG. 4, which is a front view of the sheet welding apparatus, the other output shaft (6a) is provided with a fixed output shaft (6b), and the other output shaft (6a) is an adjusting screw (9) between shafts. This enables parallel movement in the left-right direction. Gear (10) of output shaft (6b) of reduction gear mechanism (4) driven by motor (3)
Is linked with the gear (13) of the output shaft (6a) via two transmission gears (11) (12), and the parallel movement of the output shaft (6a) and the gear (13) is It is possible to change the distance between the shafts, that is, change the gap between the pressure rollers (7) and (8) as long as the tooth tips of (12) and gear (13) do not mesh with each other and do not interfere with each other. There is. This adjustable range is, for example, 2 to 5
It is good to set it to about mm.

On the upper part of the main body (A), the output shaft (6a) (6
A slide shaft (14) extending rearward in parallel with b) is fixed, and the slide shaft (14) has a slider (16) in a rotating and forward / backward moving mechanism (15) having a hot air generator (B) attached thereto. ) Is mounted.

Before describing the rotating and back-and-forth moving mechanism (15), an outline of the hot air generator (B) will be first described. As shown in FIG. 5, the hot air generator (B) comprises a cylindrical base portion (17) and a nozzle (18) connected to the base portion (17). The cylindrical base (17) has a heater and a blower (not shown) inside, and heats the air taken in from the opening at the rear end and sends it to the nozzle (18). The tip of the nozzle (18) is bent downward, and as shown in FIG.
There is an opening just above the middle of. The nozzle (18) has a rectangular cross section, and the tip portion (19) is narrowed. This tip (19)
The length in the front-rear direction is both roller portions (7a) (8b) (8a) (8b) of both pressure bonding rollers (7) (8), and voids (7c) (8c) separating these front and rear roller portions. It is long enough to cover all (see Figure 3).

The base portion (17) of the hot air generator (B) has a ring-shaped rotating mechanism (2) attached to the rotating and back-and-forth moving mechanism (15).
It is rotatably attached to 1). This rotating mechanism (21)
Has a known bearing mechanism and detent mechanism which are not shown. The bearing mechanism allows the base (17) to rotate. The detent mechanism allows the hot air generator (B) to move when the steel balls or pins pressed by the spring fall into the groove.
At least the tip portion (19) of the nozzle (18) can be stopped at a position facing directly below and a position facing directly above.

Details of the rotation and forward / backward movement mechanism (15) will be described with reference to FIGS. 6 and 7. As previously mentioned, the slider (1
The slide shaft (14) on which 6) is slidably mounted has front and rear 2
Individual round holes (22a) and (22b) are formed. The slider (16) is formed with an arc-shaped guide elongated hole (16a). On the other hand, the rotation mechanism (21) has a rectangular rotation leg at the base thereof.
(23) is fixed. As shown in FIG. 7, the rotating leg (23) is provided with two projecting pieces (24) near its center, and the stopper lever (25) is provided between these projecting pieces (24). Is pivotally supported. The stopper lever (25) is urged by a coil spring (26) so that its tip is directed downward.

The tip of the stopper lever (25) is engaged with the notch (27a) of the cylindrical stopper (27). The stopper (27) passes through the round hole (23a) of the rotary leg (23), the circular guide elongated hole (16a) of the slider (16), and the slide shaft.
It is fitted into the round hole (14a) of (14). Stopper lever (25)
Is operated against the force of the coil spring (26) and the stopper (27) is lifted up to the position shown by the imaginary line in FIG. 7 at its tip, the tip of this stopper (27) moves toward the slide shaft (14). Round hole
The slider (16) can be retracted until it falls into the round hole (14b) at the rear of the slider (16a).

On the upper part of the main body (A), there is also provided a guide member (2) with a heat radiating hole surrounding the nozzle (18) of the hot air generator (B).
9) is provided, and outside the guide member (29),
A sheet pressing member (30) is attached.

The operation and operation of the sheet welding apparatus of the present invention will be described below. First, as shown in FIG.
A guide member (29) for preventing the side edges of the two fusible resin sheets (31) (32) to be welded from directly contacting the nozzle (18) and a sheet presser on both outer sides thereof. Material (3
It is sandwiched between (0) and the pressure roller (7), (8) and is guided through to prepare for welding. Then, after adjusting the inter-axis adjusting screw (9) according to the thickness of the sheets (31) (32), the switch of the hot air generator (B) is turned on.

After the switch is turned on (or before it is turned on), the stopper lever (25) is operated to lift the stopper (27) and remove it from the round hole (14a) of the slide shaft (14). The base (17) of (B) is rotated upward about the pivot pin (22). At this time, the stopper (27)
Guided by the arc-shaped long hole (16a) of (16),
3) can be rotated. In this way, after the tip of the nozzle (18) of the hot air generator (B) is sufficiently separated from the pressure roller, the slider (16) is pulled backward and the hot air is blown by the rotating mechanism (21). The state in which the generator (B) is rotated 180 degrees is the position shown by the imaginary line in FIG. The stopper (27) will return to the round hole at the rear of the slide shaft (14) when the turning leg (23) is returned.
It falls into (14b) and is locked. In this state, until the temperature of the hot air reaches the temperature required for welding, the hot air generator (B)
So that the sheets and the pressure rollers (7) and (8) are not exposed to hot air.

When the temperature of the hot air has risen sufficiently, the hot air generator (B) is moved to the position where the tip of the nozzle (18) faces the pressure rollers (7) and (8) by performing the operation opposite to the above. return.

From the narrowed tip portion (19) of the nozzle (18), hot air that has been averaged is discharged without being biased to a relatively long flat nozzle opening width, and as shown in FIG. (3
The opposing inner surfaces of the side edges of 2) are heated to the welding temperature.

At this time, the roller portion (7) of the pressure roller (7) (8) is
The softened sheet portion of the void portion (20) between a), (7b), (8a), and (8b) is inflated and spread by the pressure of hot air. Therefore, the switch (1) is turned on and the pressure roller (7) is turned on.
The driving of (8) is started, and the side edges of (31) and (32) of both sheets are welded by these pressure rollers (7) and (8), as shown in FIG. 33) When forming (34), the void (2
In 0), the side edges of both sheets (31) and (32) are positively separated so as not to be welded.

The welding of the side edge portions of both sheets (31) and (32) proceeds by the driving rotation of the pressure bonding rollers (7) and (8). The reference numeral (35) shown in FIG. 3 indicates the ground of the tunnel, and the reference numeral (36) indicates the layer of the non-woven fabric attached to the ground (35).

[0035]

According to the present invention, the following effects can be obtained. (a) A main body is provided above and above the grip, a pair of pressure bonding rollers is provided on the front surface thereof, and a guide member and a hot air generator are provided above the grip, so that the grip can be held with one hand to support the entire apparatus, With the other hand, you can extend the wrinkle of the sheet and correct the misalignment while you proceed with the work, so workability is good and there is no need to interrupt the work due to the occurrence of wrinkles or misalignment of the sheet, which is advantageous. is there. Particularly, it is most suitable for use when a waterproof sheet is attached to the inner surface of the tunnel (Claim 1).

(B) Since the width of the tip of the nozzle is such that hot air is exerted not only on the roller portions which are spaced apart in front of and behind the pressure-bonding roller but also on the void portions between these roller portions. Portions of such a heat-fusible sheet are softened by hot air and spread by the pressure thereof, and are kept separate from each other so as not to be welded to each other during the welding operation by the pressure roller. The non-welded portion thus formed is useful for inspecting the welded portions of both sheets for defects.
Further, the tip portion of the nozzle having a continuous flat width can make the distribution of hot air uniform and ensure stable welding.
(Claim 2).

(C) If a rotating mechanism, a back-and-forth moving mechanism, a rotating mechanism, and a combination thereof are provided between the main body and the hot air generator, the hot air temperature will be sufficient before starting the welding work. Until the temperature rises, the hot air generator can be kept in a position where hot air does not hit the sheet, the pressure roller, or the like. The movement to the retracted position and the setting to the operating position can be performed quickly and reliably (claim 3,
4 and 5).

(D) By providing an adjusting means for adjusting the axial distance between the pair of pressure-bonding rollers, the present sheet welding apparatus can be used for welding heat-meltable sheets of various thicknesses.
(Claim 6).

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the vicinity of a pressure roller for explaining the welding state of the side edge portion of the sheet.

FIG. 3 is an enlarged cross-sectional view showing a sheet horizontally cut immediately above the pressure roller shown in FIG.

FIG. 4 is a front view of the sheet welding apparatus shown in FIG.

FIG. 5 is an enlarged perspective view of a hot air generator.

FIG. 6 is an enlarged side view of a rotation and forward / backward movement mechanism of the hot air generator.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

 (A) Main body (B) Hot air generator (1) Switch (2) Grip (3) Motor (4) Reduction gear mechanism (5) Spare grip (6a) (6b) Output shaft (7) (8) Crimping roller ( 7a) (7b) (8a) (8b) Roller part (7c) (8c) Void part (9) Shaft adjusting screw (adjusting means) (10) (11) (12) (13) Gear (14) Slide shaft (14a) (14b) Round hole (15) Rotation and forward / backward movement mechanism (rotation mechanism, forward / backward movement mechanism) (16) Slider (16a) Guide slot (17) Base (18) Nozzle (19) Tip ( 21) Rotation mechanism (22) Axis pin (23) Rotating leg (23a) Round hole (24) Projecting piece (25) Stopper lever (26) Coil spring (27) Stopper (27a) Notch (29) Guide member (30) Sheet pressing member (31) (32) Sheet (33) (34) Welded portion (35) Tunnel ground (36) Nonwoven fabric layer

Front page continuation (72) Inventor Takashi Iizaka 3-6 Minamimagome, Ota-ku, Tokyo (72) Inventor Akihiko Saito 3-32-47 Azamino, Aoba-ku, Yokohama

Claims (6)

[Claims] 1. A pair of left and right crimping rollers are provided on the front surface of a main body provided in the front upper portion of the grip, and both crimping rollers are rotated by a motor provided in the main body. A guide member for guiding the two heat-meltable sheets so as to be superposed between the pressure-bonding rollers and sandwiched between the pressure-bonding rollers, and a hot air blown with hot air toward a portion where the heat-meltable sheets are overlapped by the pressure-bonding rollers. A sheet fusing device comprising: a generator. 2. The left and right pressure-bonding rollers each have a plurality of roller portions having a space between them and spaced apart in the front-rear direction, and the tip of the nozzle that blows out hot air in the hot-air generation device has both pressure-bonding rollers. The sheet welding apparatus according to claim 1, wherein the sheet welding device has a flat shape which is long in the front-rear direction and blows out hot air not only on the portion corresponding to the roller portion but also on the portion corresponding to the void portion. 3. The seat according to claim 1, further comprising a rotating mechanism provided between the main body and the hot air generating device for supporting the hot air generating device such that the hot air generating device can be rotated about a horizontal axis oriented in the left-right direction. Welding equipment. 4. The sheet welding apparatus according to claim 1, further comprising a forward / backward moving mechanism provided between the main body and the hot air generating device to movably support the hot air generating device in the front-rear direction. 5. The sheet welding device according to claim 1, further comprising a rotating mechanism provided between the main body and the hot air generating device so as to support the hot air generating device so as to be rotatable about its central axis. . 6. The sheet welding apparatus according to claim 1, wherein the main body is provided with adjusting means for adjusting an axial distance between the left and right pressure-bonding rollers.