JPH054892Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The invention consists of a bend die on which a pipe to be bent is placed, and a bend punch that works together with the bend die to bend the pipe. The present invention relates to a pipe bending device including a mandrel having a shaft portion connected to a bending portion that bends in response to bending of the pipe.

(2) Conventional technology Conventionally, such a device has been developed, for example, in
It is publicly known from Publication No. 212024 and the like.

(3) Problems to be solved by the invention However, in the above-mentioned conventional method, the shaft of the mandrel is fitted into the pusher, which increases sliding resistance, and the pusher is driven by a link mechanism. Therefore, the structure becomes complicated.

The present invention was devised in view of the above circumstances, and provides a pipe bending device that has a relatively simple structure that allows the mandrel to be removed from the pipe, and that also reduces the sliding resistance during removal. The purpose is to provide.

B. Structure of the invention (1) Means for solving the problem According to the invention, the base end of the shaft of the mandrel is connected to a fixed base, and the proximal end of the shaft of the mandrel is engaged with the engaging claw that can be raised and lowered in conjunction with the bend punch. A hook having a hook portion at one end that can be engaged only when the dowel is raised is supported by a holder fixed on a base so as to be swingable around a substantially horizontal axis perpendicular to the axis of the pipe, A pusher, which has a through hole that relatively moves through the shaft of the mandrel, contacts one end surface of the pipe placed on the bend die, and is movable in the axial direction of the pipe engages with the engagement pawl. The pipe is connected to the other end of the kicker so as to press the pipe in the axial direction in response to the rotation of the pusher due to the rotation of the pusher.

(2) Effect According to the above configuration, when the pipe with the mandrel inserted is placed on the bend die and the bend punch is lowered, the pipe is bent by the bend punch and the bend die, and when the bend punch is raised. , the engaging pawl engages with the hook portion of the puller, the pusher presses the pipe, and the mandrel is pulled out from the pipe. At this time, there is no sliding resistance between the shaft of the pusher and the mandrel, and it is possible to press the pusher with a relatively small force.Moreover, the pusher is pushed and moved by the rocking of the pusher, which simplifies the structure. .

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, this pipe bending device has a rectangular cross section and is divided into three parts. a bending die 2 and a bending punch 3 for jointly bending the pipe 1; a pressing pad 4 for pressing and fixing the pipe 1 onto the bending die 2; and a mandrel inserted into the center of the pipe 1. 5, a pair of engaging claws 6 that move up and down in conjunction with the bend punch 3, and a pair of kickers 7 that can be engaged with each of the engaging claws 6 when raised.
and a pusher 8 for pressing the pipe 1 according to the rocking motion of the pusher 7.

A bend die 2 is fixed on a fixed base 9. The upper surface of this bending die 2 is formed in accordance with the processed shape of the pipe 1, and the horizontal portion 2
a, and a curved portion 2b that is curved and connected to the horizontal portion 2a. Further, above the base 9, there is a lifting platform 1 that is driven up and down by an elevator driving means (not shown).
0 is arranged, and a bend punch 3 and a pressing pad 4 are arranged on this elevating table 10. In other words, the pressure pad 4 connects the pipe 1 to the horizontal portion 2a.
In order to press and position the platform, it is supported by a support tube 11 that extends vertically and is fixed to the lower surface of the platform 10 so as to be able to move vertically relative to the platform 10 within a limited range. It is biased downward by a spring 12 provided. In addition, the curved portion 2
A support tube 1 extending vertically is provided on the lower surface of the lifting platform 10 at a position corresponding to the end opposite to the horizontal portion 2a of b.
3 is fixedly installed, and is supported by the support tube 13 so as to be able to move vertically relative to it within a limited range, and is biased downward by a spring.
A bracket 15 is provided at the lower end of 4. The bend punch 3 has a support shaft 16 having a substantially horizontal axis perpendicular to the axis of the pipe 1 placed on the horizontal portion 2a.
It is pivotally supported by the bracket 15 via.

Referring also to FIG. 3, there is a holder 1 on the base 9 at a position adjacent to the bend die 2 on the horizontal part 2a side.
7 is fixedly installed. This holder 17 is formed into a substantially U-shape in which the lower ends of a pair of vertically extending side parts 17a are connected to each other at a bottom part 17b and opened upward.
A support plate portion 18 is provided between both side portions 17a. The base end of the mandrel 5 is connected to the support plate part 18 coaxially with the pipe 1 on the horizontal part 2a.

The mandrel 5 has a shaft portion 20 connected to a bending portion 19 that bends in accordance with the bending of the pipe 1, and the bending portion 19 is fitted into the pipe 1 using an elastic material such as silicone rubber. The shaft portion 20 is formed of a rigid material so as to be insertable into the pipe 1. Flexible part 19
and the shaft portion 20 are coaxially connected, and the shaft portion 2
0 is connected to the support plate section 18.

A slide surface 21 parallel to the axis of the pipe 1 in the horizontal portion 2a is formed on the upper surface of the bottom portion 17b of the holder 17, and a pusher 8 that can come into contact with the end surface of the pipe 1 can slide on the slide surface 21. will be placed. Furthermore, the pusher 8 is provided with a through hole 22 through which the axis 20 of the mandrel 5 passes.

At the upper end portions of both side portions 17a of the holder 17, intermediate portions of the kickers 7 disposed outside of the side portions 17a are respectively pivoted by shafts 23 having substantially horizontal axes perpendicular to the axis of the pipe 1. be done. The kicker 7 is formed into a substantially L-shape with a hook portion 7a at one end, and a bent portion thereof is pivotally supported by the shaft 23. On the other hand, Pushya 8
Connecting shafts 24 are fixed to both sides of the holder 17 and project outwardly from both sides 17a of the holder 17, and these connecting shafts 24 are connected to the other end of each kicker 7. In other words, a long connecting hole 25 is connected to the other end of each pusher 7 along the radial direction of the shaft 23, and each connecting shaft 24 passes through the connecting hole 25. Further, in both side parts 17a of the holder 17, there are elongated holes 2 through which the connecting shaft 24 passes.
6 is drilled long in the direction along the axis of the shaft portion 20 of the mandrel 5. Therefore, Kitzker 7 is axis 2
By swinging around 3 as a fulcrum, the pusher 8
will move in the direction along the axis of the shaft portion 20. Moreover, the connecting pins 2 are implanted in both sides 17a of the holder 17 at the end opposite to the bend die 2.
A return spring 28 is compressed between 7 and the tip of the connection shaft 24 protruding from the connection hole 25, and the spring force of the return spring 28 causes the pusher 8 to be elastically moved in a direction approaching the support plate portion 18. As a result, each kicker 7 is resiliently biased in a direction to rotate its hook portion 7a downward.

Regarding the support cylinder 11 that supports the pressing pad 4,
At the ends of a pair of support arms 29 hanging down from the lifting platform 10 on the opposite side from the support cylinder 13 that supports the bend punch 4, there are arms that can be engaged with the hook portions 7a of the corresponding kicker 7 during the lifting operation. The engaging pawl 6 is rotatably supported by a shaft 30 having an axis parallel to the shaft 23. Moreover, the engaging claw 6 is connected to the hook portion 7.
It is capable of rotating between a horizontal position in which it protrudes from the support arm 29 toward the kicker 7 side to engage with the support arm 29, and a rotational position in which it rotates counterclockwise in FIG. 1 from that horizontal position, The support arm 29 has a first horizontal regulating surface 31 for maintaining a horizontal posture, and a second regulating surface 31 that is inclined upwardly toward the kicker 7 from the first regulating surface 31 to define a rotation range from the horizontal posture. A regulating surface 32 is provided. Furthermore, the shaft 30 has an engaging claw 6
The engaging pawl 6 is rotatably supported in a position such that the engaging pawl 6 assumes a horizontal position due to its own weight.

Next, to explain the operation of this embodiment, when bending the pipe 1, the bending portion 19 of the mandrel 5 is
The pipe 1 is placed on the horizontal part 2a of the bend die 2 so that the pipe 1 is inserted. At this time, the pusher 8 is retracted to the retraction limit, and the end surface of the pipe 1 is brought into contact with the pusher 8.

Next, when the lifting platform 10 is lowered, the engaging claw 6
contacts the hook portion 7a of each kicker 7 from above, but since the engagement claw 6 can rotate until it contacts the second regulating surface 32, the pusher 7 swings as the lifting platform 10 descends. Therefore, the pusher 8 does not move. When the lifting platform 10 further descends, the pressing pad 4 presses the pipe 1 onto the horizontal part 2a of the bending die 2, and
The bend punch 3 presses down the pipe 1 until it comes into contact with the curved portion 2b, and the pipe 1 is bent while bending the curved portion 19 of the mandrel 5. While preventing the bending portion 19 from causing distortion, the pipe 1 is The bending process is performed.

After the pipe 1 is bent, the lifting platform 10 rises, but during this upward movement, the engaging claws 6 touch each kicker 7.
It engages with the hook portion 7a from below. That is, since the engaging claw 6 is prevented from rotating clockwise in FIG. 1 from the horizontal position, the kicker 7 rotates clockwise in FIG. Pusher 8 is pushed out. As a result, the pipe 1 whose end surface is in contact with the pusher 8 is pushed and driven so as to pull out the mandrel 5.

By raising and lowering the lifting platform 10 once in this manner, the pipe 1 can be bent and the mandrel 5 can be pulled out.

Moreover, since the pusher 8 slides on the slide surface 21, the sliding resistance is lower than that of the conventional pusher in which the pusher 8 slides on the shaft of the mandrel. Moreover, the mandrel 5 can be extracted by a simple structure in which a pusher 7, which is rotatably driven by the engaging claw 6, is connected to the pusher 8.

In the above embodiment, a bending device for bending a pipe 1 having a rectangular cross section with a plurality of internal divisions has been described, but the present invention bends a rectangular pipe and a cylindrical pipe with an undivided interior It is also possible to apply it to a bending device for processing.

C. Effect of the invention As described above, according to the invention, the proximal end of the shaft of the mandrel is connected to a fixed base, and the engaging claw that can be raised and lowered in conjunction with the bend punch is attached only when the engaging claw is raised. A hooker having an engageable hook portion at one end is supported by a holder fixed on a base so as to be swingable around a substantially horizontal axis perpendicular to the axis of the pipe, and the hooker has an engageable hook portion at one end. A pusher, which has a through hole that is relatively movable and is in contact with one end surface of a pipe placed on the bend die and is movable in the axial direction of the pipe, rotates the pusher by engaging with the engaging claw. The mandrel is connected to the other end of the pusher in order to press the pipe in the axial direction according to the pressure, so the mandrel can be pulled out using an extremely simple structure in which the pusher is connected to the pusher and the pusher is rotatably driven by the engagement claw. Moreover, the sliding resistance of the pusher can be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional side view, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a view taken in the direction of the arrows in FIG. 2. 1... Pipe, 2... Bend die, 3... Bend punch, 5... Mandrel, 6... Engaging claw, 7
...Kicker, 7a...Hook part, 8...Pusher, 9...Base, 17...Holder, 19...Bending part, 20...Shaft part, 22...Through hole.

Claims (1)

[Scope of utility model registration request] A bending die on which a pipe to be bent is placed, a bending punch working together with the bending die to bend the pipe, and a mandrel having a shaft connected to a bending part that bends in accordance with the bending of the pipe. In the pipe bending device, the proximal end of the shaft of the mandrel is connected to a fixed base, and a hook part that can be engaged with the engaging claw that can be raised and lowered in conjunction with the bending punch only when the engaging claw is raised is provided. A holder at one end is supported by a holder fixed on a base so as to be swingable around a substantially horizontal axis perpendicular to the axis of the pipe, and is a penetrating hole that passes through the shaft of the mandrel so as to be relatively movable. A pusher, which has a hole and is in contact with one end surface of a pipe placed on a bending die and is movable in the axial direction of the pipe, moves the pipe in the axial direction in response to rotation of the pusher by engagement with the engaging claw. A pipe bending device, characterized in that the pipe bending device is connected to the other end of the pipe bender for pressing the pipe.