JPH0248090Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a curved gas supply pipe made of a small diameter pipe made of aluminum or copper, which is used to distribute and supply refrigerant gas to air conditioners, refrigerators, etc. This invention relates to improvements in molding equipment.

[Conventional technology]

Conventionally, this type of refrigerant gas supply pipe has been widely known to be formed by bending a straight pipe of a predetermined length into parallel meandering shapes (hairpin shapes) at predetermined intervals. In addition, as a conventional method for forming this type of supply pipe, a pipe straightening device (leveler) is used, which has a plurality of rollers arranged in a staggered manner at the entrance of a forming line equipped with a bending means in the center.
A small-diameter pipe as a processing material is first passed through this straightening device and fed onto the forming line so that it is straightened into a straight pipe, and then the straight pipe is passed through a bending means in the center of the line. Generally, the pipe is bent into a bent pipe of a predetermined shape.

However, since this straightening device attempts to straighten the bend in the material pipe simply by passing it between rollers, the straightening effect may vary depending on factors such as the hardness and elongation of the pipe itself, or the amount of oil attached to the pipe. The disadvantage is that the
Therefore, there are problems in that the straightening device must be adjusted each time depending on the diameter and type of the pipe, and even though the straightening device is provided, it is difficult to properly obtain the straightness accuracy of the pipe required for the final product. It had some problems.

[Problem that the invention attempts to solve]

The present invention improves the insufficient straightness accuracy of the pipe provided only by the conventional straightening device using rollers for forming a supply pipe, and the pipe is fed onto a forming line and bent by bending means. This is intended to ensure that appropriate straightness accuracy is obtained in advance before bending.

[Means for solving problems]

The present invention has been developed as a means to solve the above-mentioned problems, specifically, a clamp for clamping and holding both ends of a straight pipe fed onto the molding line at the tip and end of the molding line. The invention is characterized by the provision of pipe stretching means consisting of a device and a hydraulic cylinder for moving at least one of these clamping devices so that a tensile force is applied to the pipe.

[Effect]

In the molding device according to this invention, both ends of the raw material pipe supplied onto the molding line are clamped and held by clamp devices provided at the entrance and the extreme end of the molding line, and either one of the clamp devices is By moving the pipe a predetermined distance in the direction in which it is pulled by a hydraulic cylinder, a predetermined tension is applied to the pipe on the forming line, which gives appropriate straightness accuracy, and then the pipe is formed. A bending means provided at the center of the line forms the pipe into a bent pipe.

〔Example〕

Next, an embodiment of the apparatus according to the invention shown in the drawings will be described. FIG. 1 shows a plan view of a molding line 1 showing the structure of the entire apparatus. A bobbin stand 3 for a raw material pipe 2 is disposed in front of the entrance of the forming line 1, and the pipe 2 unwound from the bobbin 3 is supplied onto the forming line 1.

At the entrance of the forming line 1, a roller straightening device 4, a feeding device 5, and a cutting device 6 are arranged in order toward the inside of the line. As shown in FIG. 2, this straightening device 4 has a plurality of rollers 7 arranged in a staggered manner along the pipe 2, similar to those used in general-purpose devices, and arranged horizontally with respect to the pipe 1. It consists of a roller set 7a and a vertically arranged roller set 7b. Also, the feeding device is used to feed the pipe 2 that has passed through the straightening device 4 as shown in FIG.
A pair of upper and lower belts 8 that drive the
a and 8b, and a cutting device 6 for these belts.
The pulley 9a on the side is the driving side, and the pulley 9b on the straightening device 4 side is the driven side. Further, one or both of the upper and lower belts 8a, 8b is movable in a direction perpendicular to the axial direction of the pipe 2, so that the pipe 2 can be freely clamped and opened by applying appropriate pressure.

The cutting device 6 has a belt 10 as shown in FIG.
Two guide rollers 12 and a cutter blade 13 are attached to the tip of a hollow cutter head 11 that is rotated by
is provided, and while the cutter head 11 is rotated with the pipe 2 passed through it, the slide collar 1 at the tip of the cutter head is moved through the cam follower 14 by the drive of a hydraulic cylinder (not shown).
5 in the direction of the blade 13,
The pipe 2 is cut by pressing the slide pins 16 in the axial direction and squeezing the guide roller 12 and the cutter blade 13 in the direction of the outer peripheral surface of the pipe.

In the forming line 1 according to the present invention, a pipe stretching means 17 for applying tension to the pipe 2 is provided behind the cutting device 6.
This pipe stretching means 17 includes a clamp device 18 provided immediately after the cutting device 6, a clamp device 19 provided at the end of the forming line past the bender unit 21 in the center of the forming line 1, and It consists of a tension hydraulic cylinder 20 for moving the clamp device 19 along the axial direction of the line.

As shown in FIG. 5, the clamp devices 18 and 19 in this stretching means both
A fixed clamp piece 22 for clamping and a movable clamp piece 23 slidable by a hydraulic cylinder 24 are arranged on pedestals 25 and 26. Among these clamp devices, the clamp device 18 on the line entrance side has a pedestal 25 fixed on the molding line 1, and the other clamp device 19 has a pedestal 26 that is movable on the molding line 1 along the line axis direction. It is set up so that Behind the movable clamp device 19 (on the line end side), a pedestal 27 is fixedly installed on the line and is provided with the tension hydraulic cylinder 20 for reciprocating the movable clamp device 19 along the line axis direction. The tip of the piston rod 28 of this hydraulic cylinder 20 is connected to the base 26 of the movable clamp device 19. Furthermore, a movable clamp device 1 is mounted on the pedestal 27 of the hydraulic cylinder 20.
A tension adjusting screw 29 for setting the amount of movement of the bearing 9 is provided horizontally on the bearing 30.

The tip of the pipe 2 fed out from the bobbin stand 3 passes through each roller of the straightening device 4, and then is driven by the feeding device 5 while being clamped, moving the pipe 2 through the forming line 1, and moving through the movable clamping device 19. sent to the location. While the pipe 2 is being transferred, the movable clamp pieces 22 and 23 of both clamp devices 18 and 19 are opened to allow the pipe 2 to pass through. Further, in the stage of supplying the pipe 2 onto the line, the piston rod 28 of the tension hydraulic cylinder 20 is extended, and the movable clamp device 19 is extended.
is moved in advance toward the inlet side of line 1.

When the tip of the pipe 2 is sent to the position of the movable clamp device 19 of the molding line 1, both clamp devices 1
When the movable clamp pieces 23 of 8 and 19 are closed, the pipe 2
The cutting device 5 operates to cut the paper into a predetermined length. After the pipe 2 is cut to a predetermined length, the movable clamp device 19 is moved in the direction of pulling the pipe 2 by the tension hydraulic cylinder 20, applying a predetermined amount of tension to the pipe 2 and adding straightness to the pipe 2. . After the pipe 2 is given straightness by a predetermined tension, the pipe clamping state by both clamping devices 18 and 19 is released, and the bender unit 2 arranged in the center of the line 1
1, the pipe 2 is bent into a meandering shape, for example.

〔effect〕

The bent pipe forming apparatus for refrigerant supply pipes according to the present invention is provided with a fixed clamp device 18 and a movable clamp device 19 that clamp both ends of the pipe supplied onto the forming line as described above, and one of the movable clamp devices 1
9 is pulled by the tension hydraulic cylinder 20 to give the pipe 2 straightness due to the tension force, the bend is corrected in advance by the straightening device at the line inlet, and the straightness is maintained to a certain degree. The tension stretching means described above can impart proper and sufficient straightness to the pipe, and by bending the pipe in this state with the bender unit, the quality can be improved. This has the advantage that a refrigerant supply pipe with good quality can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing the overall configuration of the device according to the present invention, Fig. 2 is a side view of the straightening device, Fig. 3 is a side view of the feeding device, Fig. 4 is a side view of the cutting device, and Fig. 4 is a side view of the cutting device. FIG. 5 is a plan view showing the structure of the pipe stretching means. 1: Forming line, 2: Pipe, 3: Bobbin stand, 4: Straightening device, 5: Feeding device, 6: Cutting device, 7: Straightening roller, 8a, 8b: Feeding belt,
11: cutter head, 12: guide roller, 1
3: cutter blade, 14: cam follower, 1
5: Slide collar, 16: Slide pin, 1
7: Pipe stretching means, 18: Fixed clamp device, 19: Movable clamp device, 20: Hydraulic cylinder for tension, 21: Bender unit, 2
2: Fixed clamp piece, 23: Movable clamp piece, 2
4: Hydraulic cylinder, 25, 26, 27: Pedestal, 2
8: Piston rod, 29: Tension amount adjustment screw.

Claims (1)

[Scope of utility model registration request] In the bent pipe forming apparatus, a straight pipe supplied onto a forming line and cut into a predetermined length by a cutting device is bent into a refrigerant supply pipe of a predetermined shape by a bender unit in the center of the forming line. A clamping device for clamping and holding both ends of the pipe at the inlet and end of the line, respectively, and a fluid pressure cylinder for moving at least one of these clamping devices so that a tensile force is applied to the pipe. A curved pipe forming device for supplying refrigerant, characterized in that it is equipped with a pipe stretching means consisting of.