JPH0614902Y2 - Pattern plate for pipe expansion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a means for expanding a fin-type heat exchanger heat transfer tube to fix the fin.

(B) Conventional Technology Conventionally, the prior art is disclosed in JP-A-59-174234 or JP-A-60.
The pattern plate is always 1 as described in Japanese Patent No. 3927.
The maximum number of rows and columns were punched for the type of array.

(C) Problems to be solved by the invention To manufacture a heat transfer tube for a heat exchanger, Japanese Patent Application Laid-Open No. 59-174234
As described in Japanese Unexamined Patent Publication (Kokai), a pattern plate having a maximum of 3 rows and 20 columns in the same square arrangement is used as a basic attachment, for example, an attachment for selecting only 2 rows and 10 columns is used. As described in Japanese Patent No. 3927, a method of selecting 2 rows, 5 columns or 3 rows, 6 columns from among the patterns based on a perforated pattern plate having a maximum of 3 rows and 20 columns in an equilateral triangle arrangement is illustrated. Also in this case, when changing the number of pitches or the arrangement type, all the basic plates must be replaced. However, in general, the heat exchanger tubes of the heat exchanger are arranged in regular triangles and squares, and different hole intervals (pitch) are used, so when moving to expanding tubes of heat exchanger tubes of different arrangements, It is necessary to stop the operation of the device once and spend more than half a day to replace the pattern plate.
It is more than 3 kg above the ground and more than 3 m above the ground, and there are 4 or more places on the same device, which is dangerous work and the centering after replacement is a long time. Since it is a difficult work that requires work, the decrease in work efficiency was extremely remarkable.

Therefore, there is no choice but to install a separate tube expanding device corresponding to each arrangement, which is a cause of increasing the manufacturing cost.

(D) Means for Solving the Problem This invention is to make holes so as to conform to a plurality of types of pipe arrangements that are commonly used for a pattern plate mounted on a vertically movable pusher of a pipe expanding device. When moving from one tube arrangement expansion operation to another tube arrangement operation, loosen the mounting nut and move it forward or backward for a certain distance to adjust the mandrel to hydraulic pressure in accordance with the required arrangement. By doing so, it is possible to move to the work of fixing the fins to the heat transfer tubes of a completely different arrangement in an extremely short time, so it has the feature of significantly improving the production efficiency of heat transfer tubes for fin type heat exchangers of different types. It

(E) Action When the pattern plate is perforated in 8 rows, the first 4 rows are for A arrangement and the remaining 4 rows are for B arrangement. For example, for A arrangement, the pitch is 2.8 times the hole diameter and B arrangement is used. Is a pattern plate length of 97.3 cm, width 1
First with a hole diameter of 0.9 cm and 1.1 cm on a 9.2 cm thick steel plate with a thickness of 1 cm
Make holes as shown.

The pattern plate may be fixed to the pusher with a nut so that the pattern plate is connected to the mandrel of the A array for pipe expanding work, and then moved to the connection position of the B array and fixed with the nut to perform the B array work. . Since the work of changing the pattern plate from the A array to the B array can usually be done in 1 hour, it has almost no effect on the work efficiency reduction.

(F) Effect of the device This device can be transferred to the expansion work of another arrangement in a very short time with one expansion device, so it is necessary to separately install the expansion devices for the A arrangement and the B arrangement. Moreover, the downtime is extremely short compared to the conventional pattern plate replacement work, and it is less dangerous, so it does not impose a heavy burden on capital investment and significantly reduces the production efficiency. The feature is that it is possible to perform the work of expanding different types of heat transfer tubes without having to do so, and it is extremely advantageous especially when a multi-product small-quantity production system is adopted.

[Brief description of drawings]

FIG. 1 is a perspective view of a part of a pattern plate according to the present invention. 1 …… Pattern plate fixing hole 2 …… A array hole 3 …… B array hole

Claims (1)

[Scope of utility model registration request] 1. A pipe expanding device for use in a mechanical pipe expanding device, wherein a plurality of equilateral triangular arrays having different pitches, a plurality of square arrays having different pitches, or both arrays are perforated on one plate. Pattern plate.