JPH0116571B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a serpentine pipe manufacturing apparatus that bends a pipe material interposed between two parallel rod-shaped rolls in a serpentine shape.

BACKGROUND TECHNOLOGY Heat exchangers used in air conditioners, heat-retaining refrigeration equipment, etc. generally use meandering pipes, which are flat tubes bent in a meandering manner, in order to increase the heat dissipation effect. According to Japanese Patent Publication No. 50-17311, a conventional meandering pipe manufacturing apparatus of this type has a bending roller 1 attached to a rotary ring 19 that rotates around a bending roller 11 fixed to a mounting board 1, as shown in FIG.
1 and a presser roller 20 fixed in parallel. The tube material 17 of the meandering pipe is held between the bending rollers 11 and the presser roller 20, and the rotary ring 19 is rotated 180 degrees so that the presser roller 20 presses and bends the tube material 17.

That is, in order to meander the pipe material 17 using this bending means, as shown in FIG. When rotated, one end of the tube member 17 is bent as shown in b. Next, return the presser roller 20 to the starting point as shown in c.
Release the clamping of the pipe material 17, move the pipe material 17 to the next bending point as shown in d, and turn it around again as shown in e. When rotated, a meandering tube material 17 as shown in f is obtained. A meandering pipe was obtained by repeating these bending means in the same manner. In addition, by other means,
As shown in No. 17312, there is a device that uses a planetary gear device and rotates a tube member 17 held between two rollers connected by a link alternately between the rollers.

Problems to be Solved by the Invention In conventional meandering pipe manufacturing equipment, all operations are performed by hydraulic pneumatic pressure and electrical sequential control, making the equipment complicated, large-sized, and expensive. Since the head is inserted and removed and the center of rotation is moved in the middle of the two-stage bending operation, the bending operation must be interrupted, resulting in a large amount of time wasted. In addition, in the case of a planetary gear device, one with a small curvature has the disadvantage that sufficient structural strength cannot be obtained.

Means for Solving the Problems The present invention eliminates such drawbacks of the conventional art and provides a fixing ring fixed to a base plate that is eccentric from its central axis so as to rotate and axially rotate a first crankshaft fixed to a crank arm. A first shaft hole for sliding and a first recess into which the crank arm is fitted are provided on the upper surface, and a second crank shaft fixed to the crank arm is rotated by an intermediate ring that slides in contact with the fixed ring. A second shaft hole for sliding in the axial direction and a second recess for fitting the crank arm into the lower sliding surface are provided, and the first crankshaft and the first crankshaft are mounted on a movable head fixed to the intermediate ring. The first and second crankshafts are located at the extension positions of the two crankshafts.
a bending roller protrudingly provided therein, a cam floor that presses the intermediate ring protrudingly provided on the drive gear that rotates the fixed ring about its axis, and a rack that transmits the power for rotating the drive gear. a pipe material is inserted between the bending rollers, and the first
Provided is a meandering pipe manufacturing apparatus characterized in that the intermediate ring is rotated at the same time as the crank arm of the apparatus is moved up and down.

Function The meandering pipe manufacturing device according to the present invention sandwiches the pipe material between the first bending roller and the second bending roller, lowers the crank, bends the pipe material with the first bending roller, unwinds the pipe material to the next bending position, and cranks the pipe material. and bend the tube material with the second bending roller.

Embodiment As shown in FIG. 1, the embodiment of the meandering pipe manufacturing apparatus of the present invention is such that a fixing ring 2 fixed to a mounting board 1 has a first crank of a crank arm 3 at a position eccentric from its central axis. A first shaft hole 6 in which the shaft 4 can slide and rotate in the axial direction and a first recess 7 into which the crank arm 3 is fitted are provided. Furthermore, the intermediate ring 8 and the fixed ring 2 are in sliding contact with each other on the upper surface of the fixed ring 2.
A second recess 9 into which the crank arm 3 fits and a second shaft hole 10 through which the second crankshaft 5 can slide and rotate in the axial direction are formed on the sliding surface thereof. The first crankshaft 4 and the second crankshaft are in contact with this intermediate ring 8.
A movable head 12 having two bending rollers 11a and 11b projecting thereon is fixed at a position on the extension of the axis of the crankshaft 5. Further, a drive gear 13 that is centered around the fixed head 2 and that passes through a bearing is rotated by a rack 14 that is driven by power. The link 16 is pressed.

Now, with the first crankshaft 4 connected to the hydraulic or pneumatic cylinder and the first crankshaft 4 lowered, that is, with the crank arm 3 fitted into the first recess 7, the drive gear 13 is connected to the rack 14. When power is transmitted, the cam floor 15 rotates the intermediate ring 8 clockwise through the drive link 16 with the second crankshaft 5 as the center of rotation. Therefore, since the intermediate ring 8 rotates around the bending roller 11a, the pipe material 17 held between the bending rollers 11a and 11b is pressed by the bending roller 11b and bent to the right, changing from the state of a in FIG. It will be in state b. Then, when the right bending is completed, the bending rollers 11a and 11b are returned to the starting point and brought into the state shown in FIG. 2c. Here, as shown in FIG. 2d, the clamp mechanism 18 holding the tube material 17 is released, and the tube material 17 is sent to the next bending position, and is again held by the clamp mechanism 18 as shown in FIG. 2e.

Next, in the second step, the first crankshaft 4 is pushed up and the crank arm 3 is fitted into the second recess 9 of the intermediate ring 8, so that the second crankshaft 5 becomes integral with the intermediate ring 8. When the drive gear 13 is rotated to the left, the intermediate ring 8 is also rotated to the left, but since the center of rotation at this time is the first crankshaft 4, the tube member 1
7 bends to the left around the bending roller 11b as shown by the arrow f, resulting in the state g. In this way, by moving the first crankshaft 4 up and down and fitting the crank arm 3 into the first recess 7 or the second recess 9, the rotation axis of the bending rollers 11a and 11b is selected, and the right A left bend is performed.

The number of times the tube 17 is bent to the right or left, the time intervals for feeding by the clamp mechanism 18, etc. are controlled by a counter, a timer, and electrically, so that the tube 17 is automatically bent.

This meandering pipe manufacturing apparatus is controlled by signals from a control box 23 attached to a table 21 and a stand 22 supported by a plurality of legs, as shown in FIGS. 3 and 4.

Effects of the Invention The present invention has a simple structure, is easy to maintain, and can perform continuous bending operations efficiently without interrupting the operation of the device for each bending operation as in the conventional case.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a bending head in an embodiment of the meandering pipe manufacturing apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing the process of bending a pipe material according to the present invention.
Fig. 3 is a front view of the bending head of the present invention attached to a stand, Fig. 4 is an external perspective view of the meandering pipe manufacturing apparatus of the present invention, Fig. 5 is a vertical sectional view of a conventional bending head, and Fig. 6 is a FIG. 3 is an explanatory diagram showing the process of bending a pipe material using a conventional bending head. In the figure, 1: board, 2: fixing ring,
3: crank arm, 4: first crankshaft, 5: second crankshaft, 6: first shaft hole, 7: first recess, 8: intermediate ring, 9: second recess, 10: Second shaft hole, 11, 11a, 11b: bending roller,
12: Movable head, 13: Drive gear, 17: Pipe material, 18: Clamp, 19: Rotating ring, 20:
Presser foot roller.

Claims (1)

[Claims] 1. The crank arm is fitted into the upper surface of a first shaft hole which is eccentric from the center axis of the fixed ring fixed to the base plate and allows the first crankshaft fixed to the crank arm to rotate and slide in the axial direction. A first recessed portion is provided, and an intermediate ring that is in sliding contact with the fixed ring has a lower surface sliding contact with a second shaft hole that allows the second crankshaft fixed to the crank arm to rotate and slide in the axial direction. a second recess into which the crank arm is fitted; Also, a second bending roller is provided protrudingly, and a cam floor that presses the intermediate ring is provided protrudingly on the drive gear that rotates the fixed ring around the axis, and power for rotating the drive gear is transmitted. A meandering pipe manufacturing apparatus characterized in that a rack is provided to insert a pipe material between the bending rollers, raise and lower the first crank arm, and rotate the intermediate ring.