JPH0120934B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing petal-shaped finned tubes used, for example, in heat exchangers.

The applicant first arranged a corrugation shaping device around the core tube, and formed the fin material by intermittent rotation of the corrugation shaping device and the core tube and relative intermittent movement of the corrugation shaping device in the axial direction of the core tube. We have developed and proposed a manufacturing device for petal-shaped finned tubes in which the molded material is wrapped around a core tube and then heated and soldered.

However, in the above-mentioned invention, since the forming operation and the winding operation are all performed intermittently, if an attempt is made to improve productivity by increasing the speed, the device itself will vibrate, causing the forming and winding operations to be performed intermittently. There is a drawback that the attached fin material is disturbed, which impairs the quality of the product.

An object of the present invention is to improve the productivity of finned tubes by making the forming operation and the winding operation continuous.

The following will explain the embodiments shown in the drawings.

A core tube 1 is fixed to the main frame of the manufacturing apparatus by a chuck (not shown), and rotates as one unit with the chuck which rotates in conjunction with a drive device. The ribbon 2 is fed in the direction of arrow a from a reel (not shown) attached to a movable cart 3 that moves in the axial direction of the core tube 1, and is wound onto a pin to be described later. The movable cart 3 is moved linearly in the axial direction of the core tube by a drive device such as a pinion, rack, screw, or nut whose rotation source is a motor/reducer. Reference numeral 4 denotes a rotary disk, which is rotatably supported by a shaft 6 on a bracket 5 fixed on a movable cart 3, and is connected via a pulley 7 fixed to one end of the disk and a belt 8 wrapped around the pulley 7. It is driven in conjunction with a motor/reducer that is not equipped. Incidentally, this rotary disk 4 and the core tube 1 are designed to be rotated as one unit. On the other side end surface of the rotary disk 4, a plurality of pins 9 are implanted in an annular shape, and the same number of molded punches 10 are slidable in the radial direction between the pins 9 with the disk surface having an inclination angle. The bracket 5 is fitted into the bracket 5, and is engaged with a cam 13 fixed to the bracket 5 via a cam follower roller attached to the upper rear surface of the bracket.

As the rotary disk 4 rotates, the forming punch 3
When it is located in the forming area A shown in Fig. 3, its tip moves inward toward the core tube 1, and when it passes through the forming area, it gradually retreats obliquely outward, and at the position where the ribbon 2 passes, it completely rotates. A cam surface of a cam 13 that guides a forming punch 3 so as not to retract into a disk 4 and interfere with the feed of the ribbon 2 is formed.

To manufacture a finned tube using the apparatus configured as described above, the core tube 1 is first inserted into the rotary disk 4, one end of which is gripped by a chuck that rotates in conjunction with a drive device, and the other end is held by a chuck (not shown). Rotatably supported on a support device.

Next, the ribbon 2 unwound from the reel is placed on each pin 9 with the tip of the forming punch 10 in the forming area A in FIG.

In this state, the core tube 1 and the rotary disk 4 are continuously rotated as one unit by the rotary drive device, and the movable cart on which the bracket 5 is fixed is moved around the core tube 1.
When moving at a constant speed in the axial direction of Step by step backwards. When the forming punch 10 operates inward, the ribbon 2 is held between the pin 9 and the forming punch 10 and formed into a petal shape.At the same time, by moving the rotary disk 4 in the same direction with the moving cart, the ribbon 2 is formed into a petal shape. The shaped ribbon is spirally wound around the core tube 1.

Solder is applied to the outer surface of the core tube 1 in advance, and a finned tube is manufactured by heating the ribbon-wrapped tube with a heating device (not shown).

Since the present invention has the above-described structure and function, the ribbon 2 can be wound spirally on the core tube while being continuously formed, and a high-quality finned tube can be efficiently and continuously produced. It is extremely effective in improving productivity and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the entire apparatus, FIG. 2 is a side sectional view of the molding section, and FIG. 3 is a front view. 1... Core tube, 2... Ribbon, 3... Moving cart, 4... Rotating disk, 5... Bracket, 6... Bearing, 7... Pulley, 8... Belt, 9... Pin, 10... Forming punch, 11, 12... Cam holder Arora, 13...
cam.

Claims (1)

[Claims] 1 A rotary disk equipped with a plurality of pins planted in an annular shape on the side end surface and the same number of forming punches, and a bracket that rotatably supports the rotary disk are arranged around the core tube, and the rotary disk and A device that continuously rotates the core tube as one unit and a device that continuously moves the bracket in the axial direction of the core tube are provided, and a forming punch is tilted to the disk surface of the rotating disk and slides in the radial direction between each pin. 1. An apparatus for producing a petal-shaped finned tube, characterized in that a cam follower roller is provided at the outer end of a forming punch which is freely fitted and which passes through a rotary disk and engages with an annular cam fixed to the bracket.