JPH03246Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a pipe bender equipped with a bending head capable of performing two types of bending with different bending diameters, and in particular, to a pipe bender equipped with a bending head capable of performing two types of bending with different bending diameters. This relates to an elevating device for elevating and lowering.

Prior Art A type of pipe bender that bends pipes is equipped with two types of bending dies with different diameters on the same center line, arranged approximately horizontally in two stages, one above the other, and a pipe on the outer periphery of each bending die. A bending method that selectively performs two types of bending processes with different bending diameters on the pipe by having a clamping device that clamps the pipe, and rotating the pipe around the center line while clamping the pipe with the clamping device. Some have heads. Then, in order to convert the bending diameter, such a pipe bender
A bending head that raises and lowers the bending head to two positions, an upper position and a lower position, so that two bending parts using different bending dies are selectively positioned at the height position at which the pipe is supplied. Usually equipped with a lifting device.

In addition, such a bending head lifting device generally includes:
A drive cylinder is used to raise and lower the bending head, but since the bending head is usually quite heavy, a locking cylinder is provided to keep the bending head in the upper position and prevent it from falling. ing. Further, at the lower position, a stopper or the like is used to prevent further falling.

Problems to be Solved by the Invention However, when two types of cylinders are used in this way, the hydraulic circuit for supplying hydraulic pressure to both cylinders becomes complicated, and the apparatus becomes large-scale. In addition, when raising or lowering the bending head, it is necessary to confirm that the bending head has reached the raised position before operating the lock cylinder, or confirm that the lock is released before operating the drive cylinder. The control required when moving the pipe is complicated, and it takes a relatively long time to raise and lower the pipe, which limits the efficiency of the bending process performed by the pipe bender.

Means for Solving the Problems The present invention was developed against the background of the above circumstances, and its purpose is to raise and lower the bending head to two positions using one cylinder, and to move the bending head to two positions respectively. The goal is to be able to hold it.

In order to achieve such an object, the present invention provides a bending head lifting device for a pipe bender that lifts and lowers the bending head described above to two positions, an upper position and a lower position, which includes: (a) no movement in the vertical direction; (b) a slide member disposed on the mounting base and to which the bending head is fixed; and (c) a slide member arranged on the mounting base so that the bending head can be raised and lowered to the two positions. a guide member that guides the slide member; and (d) a pair of first and second links that are connected to each other so as to be relatively rotatable via an intermediate pin.
a link, the first link is rotatably connected to the slide member via a first pin, and the second link is provided with a second link on the lower side of the first pin in the moving direction of the slide member. rotatably connected to the mounting base via a pin;
When the sliding member is raised until the intermediate pin is located on a line connecting the first pin and the second pin, the bending head is located at the upper position and the first link and the second link are rotated. a link mechanism that lowers the slide member as the intermediate pin moves away from the line; (e) a drive cylinder that is connected to the first link or the second link and rotates them; f) When the first link and the second link are rotated by the drive cylinder until the intermediate pin is located on the line segment, further of the first link and the second link are rotated. a first stopper for preventing rotation, and (g) the first link and the second link are rotated by the drive cylinder in a direction in which the intermediate pin is separated from the line segment, and the bending head is It is characterized by comprising a second stopper that prevents the slide member from further lowering when the slide member is lowered to reach the lower position.

Function and Effects of the Invention In such a bending head lifting device for a pipe bender, the first link and the second link of the link mechanism are rotated by the drive cylinder, so that the bending head is fixedly attached to the slide member. The bending head is moved up and down to two positions, an upper position and a lower position, while being guided by a guide member. When the bending head is raised from the lower position to the upper position in order to change the bending diameter, the slide member is raised until the rotation of the first link and the second link is prevented by the first stopper. In this upper position, the intermediate pin connecting the first link and the second link is connected to the first pin connecting the first link to the slide member and the second pin connecting the second link to the mounting base. Since the weight of the bending head is mainly taken up by the mounting base via their first and second links, the bending head can be moved without applying significant loads to the drive cylinder. It is held in its upper position.
Furthermore, when lowering the bending head from the upper position to the lower position, the slide member may be lowered until further lowering is prevented by the second stopper; in this case, the weight of the bending head is received by its second stop, and the bending head is held in its lower position without applying any load to the drive cylinder.

As described above, according to the bending head lifting device of this embodiment, the bending head is raised and lowered to two positions, the upper position and the lower position, by one driving cylinder, and a large load is applied to the driving cylinder. Since the bending head is held in each of the two positions without any movement, there is no need for a locking cylinder to hold the bending head in the upper position, simplifying the hydraulic circuit and making the device more compact. become possible. In addition, since the bending head can be raised and lowered and held in two positions by simply operating one drive cylinder, it is easy to control when raising and lowering the bending head to change the bending diameter. The time is shortened and the efficiency of bending by the pipe bender is improved.

The effect of the present invention can be obtained if the weight of the bending head in the upper position is mainly received by the mounting base via the link mechanism and no large load is applied to the drive cylinder. The intermediate pin does not necessarily need to be precisely positioned on the line segment connecting the first pin and the second pin, but may be positioned in the vicinity of the line segment. The present invention also includes such aspects.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, a feeding device 12 is provided on a longitudinal base 10, and the base 10 is provided with a feeding device 12.
A bending head 14 is disposed at the front end of 0.
The feeding device 12 includes a truck 22 provided with a chuck 20 operated by a cylinder 18, and a pair of rails 26, which connects the truck 22 via a chain 24.
After the carriage 22 is moved back in the direction away from the bending head 14 with the pipe 30 to be bent inserted through the chuck 20, By gripping the pipe 30 and moving it forward, the pipe 30 is fed into the bending head 14 by a predetermined feed amount. Further, the chuck 20 is driven to rotate around its axis by a servo motor 32, and the pipe 30 held by the chuck 20 is rotated around its axis by a predetermined twist angle. .

On the other hand, as shown in detail in FIG. 2, the bending head 14 has two types of bending dies 34, 36 having different diameters, and is opposite to the bending dies 34, 36 with the pipe 30 in between. The bending molds 34, 36 are provided with a clamp device 38 disposed on the side.
is approximately horizontally located above and below the center line of the same rotating shaft 40.
It is located on steps. Further, the clamping device 38 includes a pair of clamp molds 42 and 44, and when the output rod 48 of the cylinder 46 is pushed out, the clamp molds 42 and 44 are connected to each other via a link mechanism 50, as shown in the figure. The pipe 30 is moved to the clamp position where the pipe 30 is clamped to the outer periphery of the bending molds 34 and 36, respectively. Which of the bending dies 34 and 36 the pipe 30 is compressed depends on the position of the bending head 14 relative to the feeding position of the pipe 30 fed by the feeding device 12, and FIG.
It is a figure which shows the state where the pipe 30 was pinched by the outer peripheral part of.

Further, the rotating shaft 40 to which the bending dies 34 and 36 are attached is rotated around its center line by a predetermined bending angle determined in advance by a bending drive device (not shown) via a pinion 52.
It can be rotated with. As a result, the pipe 30 clamped by the clamp die 42 or 44 to the bending die 34 or 36 is bent along the bending die 34 or 36. Bending molds 34, 36
Since the diameters of the pipes are different, two types of bending with different bending diameters are selectively performed depending on which of the bending parts A and B is positioned at the supply position of the pipe 30. A plurality of types of bending dies 34, 36 and clamp dies 42, 44 are prepared according to the diameter size and bending diameter of the pipe 30, and can be replaced as appropriate. In addition, in order to prevent the pipe 30 from escaping during the bending process, the bending head 14 also presses a portion upstream of the bent portion, that is, a portion on the right side in FIG. 1 upward in FIG. A pressure device 54 is integrally provided.

Then, the bending head 1 configured as described above is
4, in order to convert the bending diameter of the pipe 30, the two bending parts A and B are alternatively positioned at the supply position of the pipe 30. That is, the bending head 14 is a bending head lifting device (hereinafter simply referred to as lifting device) 5 shown in FIGS. 3 and 4.
6, and the bending part A is attached to the pipe 30 in two positions: a lower position where the bending part A is at the same height as the pipe 30 supply position, and an upper position where the bending part B is at the same height as the pipe 30 supply position. While the bending molds 34 and 36 are raised and lowered by a servo motor 58 (see FIG. 1), they are also moved along with the lifting device 56 in the left and right directions in FIG. 2 according to the diameter dimensions of the bending dies 34 and 36. Therefore, according to the pipe bender of this embodiment, two types of bending processes with different bending diameters can be continuously performed on one pipe 30.

Here, the elevating device 56 constitutes one embodiment of the present invention, and the elevating device 56 will be described in detail below.

First, in FIGS. 3 and 4, reference numeral 60 denotes a sliding member to which the bending head 14 is fixed, and is arranged on the mounting base 64 so as to be movable in a straight line by a pair of guide plates 62. . The bending head 14 is positioned by a positioning key 66, and both sides of the slide member 60 are fitted into guide grooves 68 formed between the guide plate 62 and the mounting base 64. and is guided in the above-mentioned straight direction. The guide plates 62 constitute guide members and are each fixed to the mounting base 64 with a plurality of bolts, but the fixed position is set so that the slide member 60 can move smoothly without rattling. It is adjusted by an adjustment bolt 70 provided at 64. In addition, the mounting base 6
4, the moving member 74 is moved in a substantially horizontal direction while being guided by the guide block 72 by the servo motor 58, and the moving member 74 is in a position in which it cannot move vertically and the direction of movement of the slide member 60 is substantially vertical. Fixed.

The slide member 60 is connected to the bending head 14.
It is allowed to move beyond the stroke required to raise and lower the holder to the two positions, the upper position and the lower position, and is connected to the mounting base 64 via a link mechanism 76. This link mechanism 7
6 includes a pair of first link 80 and second link 82 that are connected to each other so as to be relatively rotatable via an intermediate pin 78, and the first link 80 is connected to the slide member 60 via a first pin 84. While the second link 82 is rotatably connected to the second pin 8
It is rotatably connected to a mounting base 64 via 6. The pins 78, 84, and 86 are parallel to each other and perpendicular to the flat mounting base 64, and the second pin 86 is located lower than the first pin 84 in the moving direction of the slide member 60. In the example, it is placed at a position slightly offset from the vertical direction. Figure 4 shows these pins 78, 84, 8.
6, the second link 82 is composed of two plates located on both sides of the first link 80.

Further, the second link 82 of the link mechanism 76
As is clear from FIG. 3, it has a dogleg shape, and the intermediate pin 78 and the second pin 8
6 is provided at its curved portion and one end, while an output rod 92 of a drive cylinder 90 is connected to the other end via a connecting pin 88 parallel to the pins 78, 84, and 86 for relative rotation. ing. The drive cylinder 90 has a pair of pins 96 parallel to the connecting pin 88 between the mounting base 64 and a block 94 that is integrally fixed to the mounting base 64.
It is rotatably attached via the Therefore, as the output rod 92 of this drive cylinder 90 is driven to protrude and retract, the second link 82 is rotated around the second pin 86 and the first link 80 is rotated around the first pin 84. As the slide member 60 is rotated, the slide member 60 is raised and lowered while being guided by the guide plate 62. FIG. 5 is a longitudinal sectional view showing the vicinity of the connecting pin 88.

On the other hand, a stopper bolt 98 serving as a first stopper is screwed onto the first link 80.
By protruding the output rod 92 of the drive cylinder 90, the second link 82 is rotated counterclockwise around the second pin 86 in FIG. When the stopper bolt 98 is positioned on the line segment l connecting the
Further rotation of the first link 80 and the second link 82 is prevented. In this state, the bending head 14, which is fixed to the slide member 60, is located in the upper position.

Here, the second pin 86 is connected to two bolts 1
It is rotatably attached to a mounting block 102 fixed to the mounting base 64 by a screw 00 so as to be rotatable about its axis. Bolt 100 is attached to mounting block 10
The mounting base 64 has a guide groove 106 that guides the mounting block 102 in the vertical direction, that is, in a direction parallel to the moving direction of the slide member 60. The mounting block 1
The fixed position of 02 to the mounting base 64 can be adjusted in the vertical direction. The fixing position of the mounting block 102 is such that the bending head 14 is in the upper position when the slide member 60 is placed upward until the rotation of the links 80 and 82 is prevented by the stopper bolt 98. It is adjusted by the adjustment bolt 108 so that it is in the correct position.

Further, the output rod 92 of the drive cylinder 90
is pulled in, the second link 82 is rotated clockwise around the second pin 86 in FIG. 3, and as the intermediate pin 78 is separated from the line segment l, the slide member 60 is lowered. However, as shown in FIG. 6, further lowering is prevented by contacting a pair of stopper bolts 110. In this state, the bending head 14, which is fixed to the slide member 60, is located in the lower position. The stopper bolt 110 constitutes a second stopper and is screwed into a block 112 that is integrally fixed to the mounting base 64. By loosening the lock nut 114, the amount of protrusion from the block 112, that is, the slide member The amount of protrusion of the stopper bolt 110 is such that when the slide member 60 is lowered until it comes into contact with the stopper bolt 110, the bending head 14 is located at the lower position. It has been adjusted.

And the lifting device 56 configured as above
When the bending head 14 is raised from the lower position to the upper position in order to change the bending diameter of the pipe 30, the output rod 92 of the drive cylinder 90 is pushed out and the stopper bolt 98 is moved against the slide member 60. The slide member 60 may be raised until it makes contact. In this upper position, the intermediate pin 78 of the link mechanism 76 is located on the line segment l connecting the first pin 84 and the second pin 86, so that the bending head 1
4 is mainly received by the mounting base 64 through the link mechanism 76, and most of the force that rotates the second link 82 clockwise, in other words, the force that pushes down the output rod 92 of the drive cylinder 90, is generated. Instead, the bending head 14 is held in its upper position without imposing any significant load on the drive cylinder 90.

Conversely, when lowering the bending head 14 from the upper position to the lower position, the output rod 92 of the drive cylinder 90 is retracted and the stopper bolt 1
The slide member 60 may be lowered until it comes into contact with the slide member 10. In this lower position, the weight of the bending head 14 is taken up by the mounting base 64 via the stopper bolt 110, and the bending head 14 is held in its lower position without applying any load to the drive cylinder 90.

In this way, in the lifting device 56 of this embodiment, the bending head 14 is raised and lowered to two positions, the upper position and the lower position, by the single drive cylinder 90, and a large load is applied to the drive cylinder 90. Since the bending head 14 is held in each of these two positions without adding any additional force, there is no need to use a locking cylinder to hold the bending head 14 in the upper position as in the past, and the hydraulic circuit is simplified. This allows the device to be configured compactly. Also,
Since the bending head 14 can be raised and lowered and held in two positions by simply operating one drive cylinder 90, the control when raising and lowering the bending head 14 to change the bending diameter is simple and easy. The required time is shortened and the processing efficiency of the pipe bender is improved.

Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.

For example, in the embodiment described above, the output rod 92 of the drive cylinder 90 is connected to the second link 82, but the first link 80 may be shaped like a dogleg.
An output rod 92 may be connected thereto.

Furthermore, although the drive cylinder 90 is attached to the mounting base 64 in the above embodiment, it can also be attached to the slide member 60.

Further, in the embodiment described above, the stopper bolt 98 is provided on the first link 80, but the second link 80 is provided with the stopper bolt 98.
It is also possible to provide it in 2.

Also, without using the stopper bolt 98, the link 80 or 82 can be directly connected to the slide member 6.
0 or the like, or the links 80 and 82 may be provided with engaging portions that engage with each other to prevent their rotation. In that case, these abutting portions and engaging portions correspond to the first stopper.

Further, in the embodiment, a pair of guide plates 6
2 constitutes a guide member, but other guide members such as a guide rod or a guide rail may also be employed.

Further, in the embodiment described above, the bending head 14 is raised and lowered in a substantially vertical direction, but it may be raised and lowered in a direction that is inclined to the vertical direction.

Although no other examples are given, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a pipe bender equipped with a bending head lifting device which is an embodiment of the present invention. 2 is a longitudinal sectional view of the bending head of the pipe bender of FIG. 1; FIG. 3 is a partially cutaway front view of the bending head elevating device provided in the pipe bender of FIG. 1. FIG. 4 is a longitudinal sectional view of the bending head lifting device of FIG. 3; FIG. 5 is a sectional view showing the tip of the output rod of the drive cylinder in the bending head lifting device of FIG. 3. FIG. 6 is a front view, partially cut away, showing the bending head lifting device of FIG. 3 in different operating states; FIG. 14: Bending head, 30: Pipe, 34,3
6: Bending mold, 38: Clamp device, 56: Bending head lifting device, 60: Slide member, 62: Guide plate (guide member), 64: Mounting base,
76: Link mechanism, 78: Intermediate pin, 80: First
Link, 82: 2nd link, 84: 1st pin, 8
6: second pin, 90: drive cylinder, 98: stopper bolt (first stopper), 110: stopper bolt (second stopper), A, B: bending part,
l: A line segment connecting the first pin and the second pin.

Claims (1)

[Scope of Claim for Utility Model Registration] Two types of bending molds with different diameters are provided approximately horizontally on the same center line in two stages, one above the other, and a clamp device is provided on the outer periphery of each of the bending molds to clamp the pipe. and a bending head that selectively performs two types of bending processes with different bending diameters on the pipe by rotating the pipe around the center line while clamping the pipe with the clamp device. In the bender, in order to convert the bending diameter, the bending head is moved such that two bending sections using the two types of bending dies are selectively positioned at the height position where the pipe is supplied. A bending head elevating device for raising and lowering a bending head to two positions, an upper position and a lower position, comprising a mounting base disposed so as not to be movable in the vertical direction; a guide member that guides the slide member so that the bending head is raised and lowered to the two positions; a pair of first links and a first link that are connected to each other via an intermediate pin so that they can rotate relative to each other; Equipped with 2 links,
The first link is rotatably connected to the slide member via a first pin, while the second link connects the second pin at a position lower than the first pin in the moving direction of the slide member. the bending head is rotatably connected to the mounting base through the slide member, and the bending head is positioned at the upper position when the slide member is raised until the intermediate pin is located on a line connecting the first pin and the second pin. Along with letting
a link mechanism that lowers the slide member as the first link and the second link rotate and the intermediate pin moves away from the line; and a link mechanism that is connected to the first link or the second link to move them. a drive cylinder to rotate; and when the first link and the second link are rotated by the drive cylinder until the intermediate pin is positioned on the line segment, the first link and the second link are rotated. a first stopper that prevents further rotation, and the first link and the second link are rotated by the drive cylinder in a direction in which the intermediate pin is separated from the line segment, and the bending head is rotated. A bending head lifting device for a pipe bender, comprising a second stopper that prevents the sliding member from further lowering when the sliding member is lowered to the lower position.