JP6940151B2 - Heat welding equipment - Google Patents

Description

In the present invention, when the object to be fixed is fixed to the thermoplastic resin molded product, a welded or deformed portion called a welding boss is formed in advance on a part of the thermoplastic resin molded product, and the welded boss is formed on the object to be fixed. By passing through the fixing hole on the side or melting or deforming the tip side that protrudes so as to engage with the engaging portion formed on the side to be fixed by heat, the object to be fixed is placed on the thermoplastic resin molded product. It relates to a heat welding device for caulking.

The heat welding device disclosed in Patent Document 1 is known as a heat welding device for caulking an object to be fixed to a thermoplastic resin molded product (hereinafter referred to as "molded product"). This heat welding device heats the resistance heating element at the tip of the heat welding chip to melt and heat the welding boss, molds the welding boss into a desired shape, and then supplies cooling air to the cooling pipe provided in the heat welding chip for welding. A heat welding device that quickly cools and solidifies the boss to prevent caulking.

As shown in FIG. 4, this heat welding device clamps the heat welding chip 2 in which the resistance heating element 3 and the cooling pipe 5 are coaxially arranged and the cooling pipe 5 of the heat welding chip 2 to perform forward / backward operation. An air cylinder or an electric cylinder (not shown) of the heat welding device 20 (elevating block) including the slide rail 21 and the spring 11, the stroke sensor (photoelectric sensor) 25 for detecting the operating position of the heat welding tip 2, and the mounting base 21. It is a structure that can be moved up and down with.

The strength (pressing) of the heat welding tip 2 pushing the welding boss is adjusted by adjusting the pressurization amount of the spring 11 with the adjuster nut 24, and the stroke sensor indicates that the heat welding tip 2 has descended to the set position when the caulking is completed. Detect at 25.

JP-A-2010-042527

However, this heat welding device has the following problems.
The heat welding device has a spring for urging the heat welding tip and the heat welding tip in the caulking direction of the welding boss on the elevating block, and a slide guide and the heat welding tip for sliding the heat welding tip up and down. The structure was complicated because it consisted of many parts such as a stroke sensor that detects the position of.

Furthermore, since the object to be fixed to be caulked to the molded product is miniaturized year by year and arranged at a high density, the interval between the welding bosses to be caulked becomes narrower, and the heat welding device is miniaturized to enable welding of narrow portions. There is a need. However, in the conventional heat welding device, it is difficult to arrange the heat welding chips at narrow intervals due to the structure of the parts that slide the heat welding chips up and down. An object of the present invention is to provide a compact heat welding device capable of caulking welding bosses arranged at narrow intervals.

In order to achieve the above object, the heat welding apparatus according to claim 1 passes a welding boss formed on a thermoplastic resin molded product through a fixing hole provided on the object to be fixed and protrudes from the fixing hole. It is a heat welding device for caulking the tip side of the welding boss, and the heat welding tip of this heat welding device is integrally formed with the tip of a hollow cooling pipe, and the cooling pipe is attached to the base block. It is attached via a linear shaft with a hollow brim that slides in the linear bush that is attached to it, and a coil spring is coaxially attached to the lower side of the linear bush, and the lower end of this coil spring is said. It must be welded to the collar locked to the linear shaft, and the linear shaft must be welded to the brim at the upper end of the linear shaft and a slide block whose spacing can be adjusted is connected to the base block. It is a feature.

The heat welding apparatus according to claim 2 is the heat welding apparatus according to claim 1, wherein the slide block has a built-in proximity sensor for detecting its descending position. It is a thing.

The heat welding device according to claim 3 is the heat welding device according to claim 1 or 2, wherein the linear bush, the linear shaft, the coil spring, and the cooling pipe are used. It is characterized in that a welding unit composed of the heat welding chip and the slide block is configured to be arranged in a plurality of two or more on the plane of the base block.

Further, the heat welding device according to claim 4 is the heat welding device according to claims 1 to 3, wherein the heat welding tip is of an impulse heating method.

According to the heat welding device according to claim 1, by arranging the spring and the linear bush coaxially with the heat welding tip, the welding tip can be smoothly slid up and down, and at the same time, a lightweight and compact heat welding device is obtained. be able to.

According to the heat welding device according to claim 2, by arranging the slide block with a built-in proximity sensor, it is possible to detect the descending position of the welding tip after the caulking stop processing, and after the caulking stop process. By checking the height accuracy, it is possible to control the quality of the caulking process.

According to the heat welding apparatus according to claim 3, the welding units can be arranged at narrow intervals, and the objects to be fixed can be arranged at a high density and caulked.

According to the heat welding apparatus according to claim 4, it is possible to provide a heat welding apparatus that is compact and lightweight and has a short processing time.

Explanatory drawing showing the whole of a heat welding apparatus Explanatory drawing which shows the cross section of a heat welding apparatus Explanatory drawing which shows welding unit 17 of a heat welding apparatus Explanatory drawing showing a conventional heat welding apparatus Explanatory drawing showing the start of caulking Explanatory drawing showing the completion of caulking Explanatory drawing which shows an example which arranged a plurality of heat welding apparatus of this invention Explanatory drawing showing an example in which a plurality of conventional heat welding devices are arranged.

The heat melting device 1 of the present invention will be described with reference to FIGS. 1 to 3. In the heat welding device 1 of the present invention, an impulse heating type heat welding tip 2 is integrally formed at the tip of a hollow cooling pipe 5. The heat generating portion 3 of the heat welding tip 2 is formed coaxially with the cooling pipe 5 via the insulating material 4, and the abutting portion 3a at the tip of the heat generating portion 3 is formed in a substantially hemispherical shape according to the caulking shape. It goes without saying that the shape of the abutting portion 3a is not limited to a substantially hemispherical shape, and is appropriately set according to the desired caulking shape. The heat generating portion 3 is impulse-heated by the currents supplied from the electric wires 6a and 6b, and is cooled by the cooling air supplied from the cooling pipe 5.

The cooling pipe 5 is attached via a linear shaft 10 with a hollow brim that slides in the linear bush 9 attached to the base block 8. The heat welding tip 2 and the linear shaft 10 have a structure that integrally slides in the linear bush 9 up and down. The cooling pipe 5 and the linear shaft 10 are fixed by the enamel set 16a (hexagon socket set screw) provided on the brim 10a of the linear shaft, and the linear shaft 10 is at the position where the brim 10a of the linear shaft abuts on the slide block 12. It is fixed to the slide block 12 by the enamel set 16a.

The linear bush 9 is positioned so that the stopper ring 9a engages with the outer peripheral groove of the linear bush 9 and comes into contact with the lower surface of the base block 8. A coil spring 11 is coaxially attached to the lower side of the linear bush 9, and the lower end of the coil spring 11 is attached to a collar 10b locked to the linear shaft 10 by an E ring 10c.

A slide block 12 whose distance is adjustable with respect to the base block 8 is connected to the linear shaft 10 by contacting the brim 10a at the upper end. When the distance between the base block 8 and the slide block 12 is widened, the amount of contraction of the spring 11 increases, and the pressing force of the heat welding tip 2 increases during heat caulking.

The distance between the base block 8 and the slide block 12 is adjusted by rotating the set screw 13 that is in contact with the pillar 14 erected on the base block 8, and the set screw 13 is fixed by the lock nut 13a.

The proximity sensor 15 is fixed to the mounting hole of the slide block 12 with an enamel set 16a. The proximity sensor 15 is fixed by the enamel set 6c after the heat caulking is normally completed, the heat welding tip 2 is lowered to a desired position, the upper end of the linear bush 9 is detected and adjusted to a position where a signal is output.

The base block 8 is for mounting the welding unit 17 of FIG. 3 and attaching it to a welding device main body (not shown). Although the base block 8 having a rectangular cross section is shown in FIGS. 1 and 2, the shape is not limited to this. Needless to say, the shape can be mounted diagonally or laterally depending on the position and angle of the caulking boss and the operating direction of the welding device.

As a comparative example, a conventional heat melting device 20 is shown in FIG. In the conventional heat melting device 20, an impulse heating type heat welding tip 2 is integrally formed at the tip of a hollow cooling pipe 5, a linear guide 22 is arranged at a position parallel to the cooling pipe 5, and a spring is provided on the linear guide 22 side. The structure is such that the pull bolt 23, the spring pressure adjusting nut 24, and the proximity sensor 25 are attached to the base block 21.

In this structure, since the welding tip 2, the spring 11, and the linear guide 22 are arranged in parallel, there is a problem that the installation area in a plan view becomes large. In addition, since the respective operating axes are deviated, stress may be generated not only in the vertical method but also in the diagonal direction due to the pressing force of the thermal caulking, which may hinder smooth operation.

Examples of the caulking stop step by the heat welding apparatus 1 of the present invention will be described with reference to FIGS. 5 and 6. The structure of the main body of the welding device is omitted. In FIG. 5, the heat welding tip 2, the linear shaft 10, and the slide block 12 are pushed up in a state where the heat welding device 1 is lowered to a set position and the contact portion 3 of the heat welding tip 2 is in contact with the tip of the welding boss 18a. The spring 11 is in a contracted state.

Next, a current is supplied to the electric wires 6a and 6b from a power supply device (not shown), the resistance heating element 3 generates heat, and the welding boss 18a in contact with the contact portion 3a is heated. As the temperature of the welding boss 18a rises and the resin softens and melts, the heat welding tip 2 descends due to the pressing force of the spring 11, and the welding boss 18a deforms, forming the shape of the contact portion 3 as shown in FIG. (Stop caulking).

When the heat welding tip 2 descends to the set position, the proximity sensor 15 detects the linear bush 9 and outputs a signal. Next, cooling air is supplied to the cooling hose 7, and when the cooling air that has passed through the cooling pipe 5 cools the back side of the contact portion 3, the welding boss 18a is cooled and solidified. Finally, the heat welding device 1 is detached and raised to complete the caulking stop step.

Next, an embodiment of the caulking stop device by the heat welding device 1 of the present invention will be described with reference to FIG. 7. FIG. 7 shows four heat welding units 17 arranged in parallel with the base block 8. The structure of the welding device main body to which the base block 8 is attached is omitted.

As shown in FIG. 3, the four heat welding units 17 arranged in parallel with the base block 8 have a structure in which the heat welding tip 2, the spring 11, and the linear bush 9 are coaxially arranged. Therefore, the projected area in a plan view is smaller than that of the conventional heat welding unit 20 shown in FIG. 4, and the base block 8 can be arranged at a narrower interval. Further, since the heat welding unit 17 is small and lightweight, the operating cylinder for moving the heat welding device 1 up and down can be miniaturized.

FIG. 8 is a comparative example in which a plurality of conventional heat welding units 20 are arranged. In the conventional heat welding unit 20, since the heat welding tip 2, the spring 11, and the linear guide 22 are arranged in parallel, there is a limit to arranging the welding tips in close proximity, and the pitch is narrow as shown in FIG. It was difficult to place them at intervals.

In this embodiment, the heat welding units 17 are arranged in a row on the base block 8 at the same height, but the implementation method is not limited to this, and a plurality of heat welding units 17 are randomly arranged on the base block 8 and the like. It is possible to use it according to the purpose.

1 Heat welding device 2 Heat welding chip 3 Resistance heating element 3a Contact part 4 Insulation part 5 Cooling pipe 6a, 6b Wire 7 Cooling hose 8 Base block 9 Linear bush 10 Linear shaft 10a Linear shaft brim 10b Linear shaft collar 11 Spring 12 Slide block 13 Push screw 14 Pillar 15 Proximity sensor 16a, 16b, 16c Hollow set (hexagon socket set screw)
17 Heat welding unit 18 Resin molded product 18a Welding boss 19 Fixed object 20 Conventional heat welding unit

Claims (4)

This is a heat welding device for passing a welding boss formed on a thermoplastic resin molded product through a fixing hole provided on the side to be fixed and caulking the tip side of the welding boss protruding from the fixing hole. The heat welding tip of the heat welding device shall be integrally formed at the tip of the hollow cooling pipe.
The cooling pipe is attached via a linear shaft with a hollow brim that slides within a linear bush that is attached to the base block.
A coil spring is coaxially attached to the lower side of the linear bush, and the lower end of the coil spring is attached to a collar locked to the linear shaft.
A slide block whose distance can be adjusted with respect to the base block is connected to the linear shaft by contacting the brim at the upper end of the linear shaft.
A heat welding device characterized by. The heat welding device according to claim 1, wherein the slide block has a built-in proximity sensor for detecting the descending position of the heat welding device. The base block has two or more welding units including the linear bush of the heat welding device, the linear shaft, the coil spring, the cooling pipe, the heat welding tip, and the slide block. The heat welding apparatus according to any one of claims 1 or 2, wherein a plurality of heat welding devices are arranged. The heat welding device according to any one of claims 1 to 3, wherein the heat welding tip of the heat welding device is of an impulse heating method.

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