JPS6128503B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending device for a resin pipe formed on the inner peripheral surface of a rubber mold having end jigs at both ends, and its purpose is to bend a resin pipe. The point is that it can be done quickly and accurately.

The present invention provides an apparatus for bending a resin pipe to be molded onto the inner peripheral surface of a rubber mold having end jigs at both ends.
A concave end block body is provided at both ends to engage the end face jig from below, and a concave block body is provided in the middle to support rubber molds from below at appropriate intervals. It is attached to the lower surface of the block body and mounted on the same camshaft so that the peripheral part can be fitted into the cam groove of the actuation block body, and by rotation of the camshaft, each concave block body is machined into a resin pipe. In the vertical plane including the axis of the concave block body, the closer the concave block body is to the end, the greater the distance it moves in the axial direction, and the higher the position, the more each concave block body is moved toward the center of curvature of the bending process. It is equipped with a cam disk that directs the direction.

With the above configuration, the concave block bodies at both ends apply tensile stress between the end jigs, and the concave block bodies on the end side are displaced so as to be positioned higher, and each is moved toward the center of curvature of the bending process. Because the tube is oriented, the resin tube molded into the rubber mold is bent without shrinking the inner surface, so there are no wrinkles on the inner surface of the bend.
This allows for accurate bending.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, an example of obtaining a resin pipe molded on the inner peripheral surface of a rubber mold having end jigs at both ends will be described in the first example.
This will be explained based on FIGS. First, a centrifugal molding apparatus will be explained with reference to FIG. The part above the rotation axis 1 shows the time when the socket part is being molded, and the part below shows the time when the whole part is being molded. Reference numeral 2 denotes a rotary mold, which is composed of an annular member 3 forming both ends and a cylindrical integral mold body 4 attached between opposing surfaces of these annular members 3, and placed on a rotation drive device 5. Ru. This rotary drive device 5 includes a rotating shaft 8 supported by a pair of fixed frames 6 via bearings 7, a wheel 9 attached to both ends of the rotating shaft 8, and a wheel 9 integrally mounted inside the wheel 9. It is composed of an attached annular protrusion 10 and a drive section (not shown) that is interlocked with one rotating shaft 8, and the outer periphery of the wheel body 9 is formed into an arcuate surface 11. A wheel contact surface 12 that is received by the wheel body 9 is formed on the outside of the outer circumference of the annular member 3, and a circumferential groove 13 into which the annular protrusion 10 fits is formed inside the ring contact surface 12. Furthermore, a convex curved surface 14 is formed on the inner periphery corresponding to the circumferential groove 13. Also, both annular members 3
An annular recess 15 is formed on the inner surfaces facing each other. At both ends of the mold body 4, outward ring portions 16 are integrally formed. These ring portions 16 can be tightly fitted into the annular recess 15, and in the fitted state, the fixture 1 can be inserted from three positions in the circumferential direction.
7, the two are integrated. Reference numeral 18 denotes a medium mold that can be inserted into the mold body 4, and is configured to be divisible (divided into two) in the circumferential direction, and is made of, for example, aluminum. Reference numeral 19 denotes a rubber mold that can be attached to the inner surface of the middle mold 18, and is made of soft rubber, silicone, urethane, etc., and has ring portions 20 and 21 formed outward at both ends thereof. The ring portion 20 on the receptacle side is engaged with a rubber presser jig 22 fitted inside the mold body 4, and the ring portion 21 on the spout side is engaged with a stepped portion of the middle mold 18. An end face jig 23 that can be inserted into the mold body 4 is attached to the insertion portion side of the middle mold 18. An end face jig 24 is also disposed on the receptacle side, and this includes a flange 24A that is integrated with the rubber presser jig 22 via a fixture 25, and a flange 24A that extends outward from the inner edge of the flange 24A. It consists of a continuous cylindrical portion 24B. Both end face jigs 23 and 24 apply a ring-shaped presser metal fitting 26 over the outer circumferential surface of the annular member 3, and fix the presser metal fitting 26, the annular member 3, and the ring portion 16 at three locations in the circumferential direction. It is fixed by integrating with the tool 27. 28 is a socket side end surface jig 24
A cylindrical receptacle inner surface regulating tool that fits inside and is movable in one direction of the rotation axis, and protrudes inwardly with respect to the end face jig 24 to cover the inner circumferential surface of the molded receptacle. A spring 2 is provided on the inner side of this end jig 24.
A ball 30 is provided which is biased inward by the receptacle 9, and recesses 31 and 32 into which the ball 30 can be elastically fitted are formed at two locations on the outer surface of the receptacle inner surface regulating device 28 that are spaced apart in the direction of the rotation axis 1. has been done.
The positions of these recesses 31 and 32 are such that the ball 30 fits into the recess 31 when the inner surface of the end face jig 24 and the inner surface of the socket inner surface regulating member 28 are flush with each other.
The ball 30 is set to fit into the recess 32 when the socket inner surface restrictor 28 covers the inner circumferential surface of the molded socket. Reference numeral 33 denotes a swingable stopper, the middle of which is attached to the fixed frame 6 via a horizontal pin 34. The upper ends of these stoppers 33 are bent outward, and the lower surface of the bent portion is formed into a stopper concave curved surface 35 that can be positioned inside the convex curved surface 14. Also stoppa 33
The lower end is bent inward, and this bent portion becomes a locking portion 36 for the fixed frame 6. This locking part 36
A cylinder 37 for swinging the stopper 33 is provided between the fixed frame 6 and the fixed frame 6.

Next, a centrifugal molding operation using the centrifugal molding apparatus having the above configuration will be explained. The area above the rotational axis 1 shows the time of molding the socket part. In other words, the socket inner surface restrictor 28 has moved outward, and its position has been moved to the recess 31.
This is maintained by fitting the ball 30 into the hole. In this state, while rotating the rotary mold 2 around the rotation axis 1 by operating the rotary drive device 5,
Socket side end face jig 23 or socket inner surface regulating tool 2
Materials such as resin liquid, reinforcing fibers, and sand are supplied onto the inner circumferential surface of the socket molding part of the rubber mold 19 through the central through hole 8, and centrifugal molding of the socket part 38a is performed. After that, the socket inner surface regulating device 28 is pushed in by a predetermined amount.
This pushed-in position is maintained by the ball 30 fitting into the recess 32. Next, rubber mold 19
The material is supplied onto the inner surface from the socket molding part to the body molding part in the same manner as described above.
A resin tube 38 is centrifugally molded as shown below.

Next, the demolding device will be explained based on FIGS. 2 to 4. Reference numeral 39 denotes an extraction device for grasping the end face jig 24 integrated with the middle mold 18 side and extracting it from the rotary mold 2;
0, a plate 42 attached to the tip of the piston rod 41, and a pin 43 on the front of this plate 42, respectively.
A pair of swinging arms 44 attached via A and 43B
A, 44B, locking portions 45A, 45B bent inward from the tips of these swing arms 44A, 44B, and a cylinder device 46 that moves both swing arms 44A, 44B toward or away from each other. Although the swinging arms 44A, 44B are provided as a pair on the upper and lower sides, they may be provided as a pair on the left and right. A conveyor device 47 is provided between the rotary mold 2 and the extraction device 39, and is for receiving the medium mold 18 extracted from the rotary mold 2 by the extraction device 39. That is, the conveyor device 47 includes a pair of front and rear rotating shafts 49, 50 supported by a machine frame 48, and a pair of left and right chains 51, 5 attached to these rotating shafts 49, 50, respectively.
2, a roller chain 53 attached between the chain rings 51 and 52 facing each other in the front and rear, a rail 55 attached to the machine frame 48 to receive the rollers 54 of the roller chain 53, and between the opposing sides of both chains 53. It consists of an attached concave medium-sized receiving plate 56, and a plurality of medium-sized receiving plates 56 are provided at predetermined intervals in the length direction of the chain 53. Furthermore, swingable locking pieces 62 are attached to the upper portions of both sides of each medium-sized receiving plate 56. A pivot shaft 57 along the rotation axis 1 is inserted through the lower part of one side of the machine frame 48,
This pivot shaft 57 is attached to a bracket 59 from the floor 58 side.
is rotatably supported. Further, a cylinder device 60 for swinging the machine frame 48 is provided between the lower end of the machine frame 48 and the floor 58. 61 is a stopper that receives the other end of the machine frame 48 in a horizontal position;
3 is a bending device of the present invention that receives the rubber mold 19 taken out.

The rotary mold 2 is stopped when the resin tube 38 centrifugally molded onto the inner circumferential surface of the rubber mold 19 by the centrifugal molding device is fully cured (semi-cured). Then, by releasing the fixture 27, both presser metal fittings 26 are removed, and the middle mold 18 is brought into a state where it can be pulled out. Next, the swinging arms 44A, 44
The cylinder device 40 is extended with the arms B spaced apart from each other, and the swinging arms 44A, 44B are attached to the end jig 2.
Position it outside of 4. and cylinder device 46
The swinging arms 44A and 44B are brought closer together by the contraction of the
The locking portions 45A and 45B are engaged with the end face jig 24. In this state, by contracting the cylinder device 40, the middle mold 18 is extracted from the rotary mold 2 via the end jig 24. At this time, the rubber mold 19 and the resin tube 38 are also extracted together. medium size 18
is received by the medium-sized receiving plate 56 of the conveyor device 47 as it is extracted. At this time, the conveyor device 47 may be rotated automatically by the pulling force of the medium mold 18, or may be forcedly driven. As shown in FIG. 2, the medium mold 18 extracted from the rotary mold 2 is completely received by the conveyor device 47. Thereafter, the cylinder device 46 is extended and both swing arms 44 are moved as shown in the imaginary line in FIG.
A and 44B are separated from each other. Then, as shown by the imaginary line in FIG. 3, the upper half of the splittable medium 18 is lifted up using a hoist (not shown) or the like. Thereafter, the cylinder device 60 is extended, and the conveyor device 47 is swung around the pivot shaft 57 via the machine frame 48, as shown by the solid line in FIG. Then, as shown by the imaginary line, the rubber mold 19 is taken out from the middle mold 18 together with the resin tube 38 and placed on a bending device 63.

Next, the bending device 63 of the present invention is shown in FIGS.
This will be explained based on the diagram. This bending device 63 is in the form of a trolley, and a plurality of wheels 65 are attached to the lower surface of the substrate 64. A pair of front and rear frames 66A, 66B are erected on the board 64, and bearings 67A,
A camshaft 68 is horizontally suspended via 67B. The camshaft 68 is interlocked and connected to a motor 69 installed on the base plate 64 via an endless transmission mechanism 70. Furthermore, a pair of left and right side plates 71 are connected to the board 64.
A and 71B are erected. 72A is a concave block body that supports the end face jig 24 from below, 72B
is a concave block body that supports the end face jig 23 from below, and has engaging portions 72a and 72b that prevent the end face jigs 24 and 23 from moving in the axial direction. 7
2C, 72D, 72E, and 72F are concave block bodies that support the rubber mold 19 at multiple locations from below. These block bodies 72A to 72F are individually fixed to base plates 73A to 73F, and each base plate 73A to 73F is respectively fixed to gate-shaped frame plates 74A to 74F.
via a fixture (bolt/nut) 75 so that it can be replaced. The gate-shaped frame plates 74A to 74
The side plate portions F fit on the outsides of both side plates 71A and 71B, and are allowed to move up and down and back and forth (swing), but are prevented from rotating. The gate-shaped frame plates 74A to 74
Operating block bodies 76A to 7 are provided on the bottom surface of the top plate of F.
6F is attached, and these actuating block bodies 76A
~76F are left and right cam grooves 77A~77F, respectively.
has. A plurality of cam discs 78A to 78F are attached to the cam shaft 68 to fit into these cam grooves 77A to 77F. These cam disks 78A
-78F are constructed by being deformed so that they can be moved up and down while swinging the operating block bodies 76A-76F.

The bending device 63 configured as described above is
As shown in FIGS. 5 and 7, cam discs 78A~
The vertical part of 78F is operated by block bodies 76A to 76F.
The rubber mold 19 side is received in a state in which all concave block bodies 72A to 72F are made horizontal in accordance with the above. In this reception, the rubber mold 19 is supported by the concave surfaces of the concave block bodies 72C to 72F, and the end jig 24 is supported by the concave surfaces of the concave block bodies 72A and 72B.
23 and its engaging portions 72a, 72
b is engaged with the end face jigs 24 and 23. In this state, the motor 69 is operated to rotate the cam disks 78A to 78F via the camshaft 68. Then, the cam disc 78A is moved against the cam grooves 77A to 77F.
Since the deformation portions 78F to 78F act gradually, the operating block bodies 76A to 76F, the gate frame plates 74A to 74F, and the base plates 73A to 73F act accordingly.
The concave block bodies 72A to 72F are displaced through them, thereby deforming the resin tube 38 together with the rubber mold 19 as shown in FIG. After this deformation, rubber mold 1
9 and the like are transferred to the next step, such as curing.

The radius of curvature can be changed using cam discs 78A to 78F.
This can be done arbitrarily by changing the diameter of the tube, and the concave block bodies 72A to 72F can be replaced by attaching and detaching the fixing member 75.

In the embodiment described above, the end face jigs 23 and 24 are deformed by being pulled outward while being raised;
The 3 and 24 sides may be pulled outward.

As described above, according to the present invention, a resin pipe can be quickly bent simply by rotating the camshaft. In addition, the bending process can be performed by stretching the outer side of the bending, that is, without shrinking the inner side of the bending, and can be performed accurately without creating wrinkles on the inner side of the bend.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view of a centrifugal molding device, FIG. 2 is a partially cutaway side view during demolding, and FIG. 3 is a longitudinal front view of FIG. 2;
FIG. 4 is a longitudinal sectional front view when taken out, FIGS. 5 and 6 are longitudinal sectional side views of the bending device, and FIG. 7 is a sectional view taken along line AA in FIG. 5. 19...Rubber mold, 23, 24...End face jig, 38...
Resin pipe, 63...Bending device, 64...Substrate, 68
...Camshaft, 69...Motor, 71A, 71B...Side plate, 72A-72B...Concave block body, 72a,
72b...Engaging portion, 73A-73F...Base plate, 7
4A-74F...Gate frame body, 76A-76F...Operation block body, 77A-77F...Cam groove, 78A-
78F...Cam disc.

Claims (1)

[Claims] 1. A bending device for a resin pipe that is formed on the inner circumferential surface of a rubber mold having end jigs at both ends, which includes a concave end block body on both ends of which the end jigs are engaged from below, and a rubber mold in the middle. Concave block bodies supported from below are provided at appropriate intervals, and an actuation block body having a cam groove at the lower end is attached to the lower surface of each concave block body, and the camshafts are mounted on the same camshaft, and the peripheral portion is connected to the above-mentioned actuation block body. In a vertical plan view including the axis of the resin pipe, the concave block body can be fitted into the cam groove of the resin tube, and the concave block bodies can be fitted into the cam grooves of the resin tube, and the concave block bodies can be fitted into the cam grooves of the resin pipes. A resin pipe bending device characterized in that it is provided with a cam disk that is displaced so as to be positioned higher as it becomes larger, and that directs each concave block body toward the center of curvature of the bending process.