JPH0757381B2 - Carriage drive for bending - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending carriage driving device capable of supplying a long pipe at a high speed and applying an axial compressive force.

[0002]

2. Description of the Related Art Conventionally, when bending a pipe, in order to prevent a local thinning of the pipe wall, the pipe is bent while applying a compressive force in the axial direction.
As disclosed in Japanese Patent No. 205620, there is known one in which an axial compression force is applied from a rear end of a pipe by a hydraulic cylinder in accordance with a bending angle of a bending die to perform bending.

However, in this device, when the hydraulic circuit is switched between the case where the pipe is fed at a high speed in the axial direction and the case where the axial compressive force is applied, the structure of the hydraulic circuit becomes complicated. There was a problem of becoming. Further, when feeding a long pipe, the stroke of the hydraulic cylinder becomes very long, which is not realistic.

Therefore, as disclosed in Japanese Patent Laid-Open No. 2-274321, a carriage is movably connected by a chain, and the chain and a drive source for rotationally driving the chain are connected by two types of transmission mechanisms. The first transmission mechanism transmits the rotation of the motor to the drive shaft via the first clutch, and the second transmission drive source transmits the rotation of the motor to the drive shaft at a speed reduction ratio larger than that of the first drive source.

Thus, when the pipe is fed at high speed, the first transmission mechanism connects the motor and the chain, and when the axial compression force is applied, the second transmission mechanism connects the motor and the chain. I am trying to connect.

[0006]

However, although the power required for feeding the pipe at high speed may be small, the axial compression force required for bending is very large. Therefore, when trying to obtain a sufficient axial compression force,
There is a problem that a large-sized motor is required and the reduction gear ratio of the second transmission mechanism must be made very large, resulting in a large size. In addition, a motor that matches the required axial compression force has a problem that the motor is too large when the pipe is fed at high speed.

Therefore, the present invention has an object to solve the above-mentioned problems, and a small bending carriage having a driving mechanism capable of appropriately feeding a pipe at high speed and applying an axial compressive force thereto. It is to provide a drive device.

[0008]

In order to achieve such an object, the present invention has the following constitution as means for solving the problem. That is, a long bending pipe is clamped by a rotatable bending die and a fastening die capable of revolving around the bending die, and the bending mechanism for revolving the fastening die and bending the pipe is provided with the pipe. In a bending carriage driving device that feeds the pipe by a carriage that holds one end of the pipe and moves in the axial direction of the pipe, the carriage is locked to a chain stretched in the axial direction of the pipe, and the motor is driven by a motor. The carriage includes a high-speed drive mechanism that drives the chain to move the carriage, and a drive cylinder that pushes the rack movably supported in the axial direction of the pipe toward the bending mechanism during bending, and the carriage. A first gear rotatably supported and meshed with the rack;
A rotatably supported oscillating lever oscillatably supported by the carriage, the reverse rotation of the rotation of the first gear is transmitted, and the oscillating lever oscillates to engage with the rack. Structure of a carriage drive device for bending, comprising a pushing mechanism having two gears and a lock cylinder that swings the swing lever during bending to mesh the second gear with the rack. Is that.

[0009]

In the bending carriage driving device having the above structure, when the pipe is supplied at high speed, the high speed driving mechanism drives the chain by the motor to move the carriage. In addition, during bending that requires axial compressive force of the pipe, the pushing mechanism swings the swing lever by the lock cylinder to mesh the second gear with the rack. Therefore, the carriage is connected to the rack by the first gear and the second gear. Then, the drive cylinder pushes the rack to generate an axial compressive force on the pipe.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a bending carriage driving device that is an embodiment of the present invention. 1 is a pipe,
A bending die 2 corresponding to the bending shape of the pipe 1 is rotatably supported by a main body (not shown). A clamping die 4 is supported so as to be opposed to the bending die 2 and slidable toward the bending die 2,
The clamping die 4 is slidably driven by the cylinder 6 to move the pipe 1
It is designed to sandwich.

The clamping die 4 is supported so that it can revolve around the bending die 2 as the bending die 2 rotates, and the clamping die 4 revolves around the bending die 2 to bend the pipe 1. Is configured to. Further, a wiper die 8 is provided close to the bending die 2, and a pressure die 10 is provided opposite to the wiper die 8. The pressure type 10 is a wiper type 8
It is slidably supported toward and is slidably driven by a cylinder 12 to come into contact with the pipe 1.

Moreover, the pressure die 10 is slidably supported in the axial direction of the pipe 1 and is slidably driven by the cylinder 14. By the way,
The bending mechanism 16 is configured. On the other hand, two rails 18 and 20 are laid parallel to the axial direction of the pipe 1, and a carriage 22 is provided so as to be movable along the rails 18 and 20. The carriage 22 includes a chuck 24 capable of biting the end of the pipe 1.

Sprockets 26 and 28 are provided near both ends of the rails 18 and 20, respectively.
6 and 28, parallel to the axial direction of the pipe 1, the chain 3
0 is stretched. And one sprocket 28
Is connected to the rotating shaft of a geared motor 32.

Further, the chain 30 and the carriage 22 are locked by a locking member 34 attached to the carriage 22 at one end and to the chain 30 at the other end. These sprockets 26, 28, chain 30, motor 32
The high-speed drive mechanism 36 is configured by.

A rack 38 is provided between the rails 18 and 20 in parallel with the axial direction of the pipe 1, and the rack 38 is movably supported in the axial direction. A rod 42 of a hydraulically driven drive cylinder 40 is connected to the rear end of the rack 38. On the lower surface of the carriage 22, the rack 3
A pair of support members 44 provided with 8 in between.
The first gear 46 is rotatably supported by the rotation shaft 48 on the support member 44. Further, the first gear 46 is meshed with the rack 38, and the first idle gear 50 is meshed with the first gear 46.

The first idle gear 50 is rotatably supported on a support member 44 by a support shaft 52, and a pair of rocking levers 54 and 56 are rotatably fitted on the support shaft 52. . In addition, the swing levers 54 and 56 have the first
The second idle gear 58 meshed with the idle gear 50 is rotatably supported, and the second gear 60 meshed with the second idle gear 58 is rotatably supported.

The second gear 60 includes swing levers 56, 5
The position, the number of teeth, and the like are set so that the rack 38 is engaged or disengaged by the rocking of 8. That is, when the rocking levers 56 and 58 rock,
The positions of the first idle gear 50 and the second idle gear 58 are set so that the crests of the second gear 60 and the troughs of the rack 38 coincide with each other.

The first idle gear 50 and the second idle gear 58 are provided so that the rotation directions of the first gear 46 and the second gear 60 are opposite to each other.
Not limited to this case, any number of idle gears may be provided and the rotation direction may be opposite.

The second gear 60 may be directly meshed with the first gear 46 without providing an idle gear. In that case, the swing levers 56 and 58 swing on the rotary shaft 48. It may be configured to be movably fitted. Even in that case, it is necessary to set the position, the number of teeth, and the like so that the crests of the second gear 60 and the troughs of the rack 38 coincide with each other due to the swing.

A rod 64 of a lock cylinder 62 is connected to one ends of the swing levers 56 and 58, and the cylinder side of the lock cylinder 62 is swingably supported by a support member 44. The rack 38, the drive cylinder 40, the support member 44, the first gear 46, the rotary shaft 48, the first idle gear 50, the support shaft 52, the swing levers 56 and 58, the second idle gear 58, the second gear 60, The lock cylinder 62 constitutes a pushing mechanism 66.

Next, the operation of the bending carriage driving device of this embodiment described above will be described. First, the clamping die 4 and the pressure die 10 are moved in the directions away from the pipe 1 by the cylinders 6 and 12, respectively, and the rear end of the pipe 1 is bitten by the chuck 24. Further, the lock cylinder 62 causes the swing levers 56 and 58 to swing around the support shaft 52, and the meshing between the second gear 60 and the rack 38 is released.

Then, the motor 32 is driven, the chain 30 is rotationally driven, and the carriage 22 moves the rails 18,
Moved along 20. At that time, the first gear 46, the first
Idle gear 50, second idle gear 58, second gear 6
Zero spins. When the bending portion of the pipe 1 is fed to the bending die 2, the driving of the motor 32 is stopped. Then, the cylinders 6 and 12 are driven, the pipe 1 is sandwiched between the bending die 2 and the tightening die 4, and the pressure die 10 is brought into contact with the pipe 1.

Further, the lock cylinder 62 is driven,
The swing levers 56 and 58 are swung so that the second gear 60 meshes with the rack 38. As a result, the first gear 46 and the second gear 60 are meshed with each other by the first idle gear 50 and the second idle gear 58 so that the rotation directions thereof are opposite to each other. It cannot rotate with the two gears 60 and therefore the carriage 22 is connected to the rack 38.

Then, as shown in FIG. 3, as the bending die 2 rotates, the fastening die 4 revolves around the bending die 2, and accordingly the pipe 1 is wound around the bending die 2 so that the pipe 1 is wound around the bending die 2. Is withdrawn. Also, the cylinder 40
Is driven to push the rack 38 in the feeding direction of the pipe 1. The cylinder 14 is driven and the pressure die 10 is also pushed in the same direction.

As a result, the carriage 22 is pushed in the feeding direction, and an axial compressive force is applied to the pipe 1. The axial compression force can be set to a suitable value by controlling the pressure and flow rate of the hydraulic oil supplied to the drive cylinder 40. By applying an axial compressive force, the pipe 1
Is prevented from being thinned and is bent into a shape corresponding to the bending die 2. After the bending process is completed, the cylinders 6 and 12 are driven to slide the clamping die 4 and the pressure die 10 away from the pipe 1. The bending die 2 and the fastening die 4 are rotated and returned to their original positions.

Further, the lock cylinder 62 is driven to swing the swing levers 54 and 56 to move the second gear 60 to the rack 3.
Release from meshing with 8. Then, the drive cylinder 40 is driven to move the rack 38 and retract it to the original position. Further, the motor 32 is driven to move the carriage 22 via the chain 30 to feed the pipe 1. At this time, the resistance for feeding the pipe 1 is small, and the carriage 22 can be moved at high speed by the motor 32 via the chain 30.

After feeding the pipe 1 by a predetermined amount and feeding it to the next bending portion, the cylinders 6 and 12 are driven again to move the pipe 1 by the clamping die 4 as shown in FIG. Then, the pressure die 10 is brought into contact with the pipe 1. Further, the lock cylinder 62 is driven to mesh the second gear 60 with the rack 38.

Then, the bending die 2 is rotated, the clamping die 4 revolves around the bending die 2, and the drive cylinder 40 is driven to move the rack 38 to apply an axial compressive force. By repeating this, the pipe 1 is bent into a predetermined shape. Therefore, according to the bending carriage drive device of the present embodiment, when the pipe 1 is fed at high speed, the motor 32 feeds the pipe 1 at high speed to shorten the tact time. Further, since the feeding resistance at that time is small, the motor 32 may be small in size accordingly.

During bending, the rocking levers 54 and 56 are rocked by the lock cylinder 62 so that the second gear 60 meshes with the rack 38 to connect the carriage 22 and the rack 38. The drive cylinder 40 is driven in accordance with the rotation of the bending die 2 to push the rack 38 and apply an axial compressive force to the pipe 1. Thereby, thinning of the pipe 1 is prevented.

At the time of bending, since the driving cylinder 40 applies an axial compressive force, it can be easily pushed with a large force. Further, the stroke of the drive cylinder 40 does not require a long stroke corresponding to the length of the long pipe 1. It suffices to have a stroke corresponding to the length of the pipe 1 that is drawn out according to the bent shape, and since the stroke may be short, the device becomes compact.

The present invention is not limited to the embodiments as described above, and can be carried out in various modes without departing from the gist of the present invention.

[0032]

As described in detail above, the bending carriage driving device of the present invention is a motor for feeding a pipe at high speed, and a driving cylinder for connecting a rack and a carriage when applying a compressive force in the axial direction. Since the carriage is moved by, high-speed feeding of the pipe and application of the axial compressive force can be appropriately performed, and a motor and a drive cylinder having an appropriate size required respectively can be selected. Further, there is an effect that miniaturization is also achieved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bending carriage drive device as an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of this embodiment.

FIG. 3 is an enlarged top view of the bending mechanism of this embodiment.

FIG. 4 is an explanatory view of bending when bending is performed by the bending mechanism of the present embodiment.

[Explanation of symbols]

1 ... Pipe 2 ... Bending die 4
… Tightening mold 10… Pressure mold 16… Bending mechanism 2
2 ... Carriage 24 ... Chuck 30 ... Chain 3
2 ... Motor 36 ... High-speed drive mechanism 38 ... Rack 4
0 ... Drive cylinder 46 ... First gear 54, 56 ... Swing lever 6
0 ... 2nd gear 62 ... Lock cylinder 66 ... Pushing mechanism

Claims (1)

[Claims] 1. A long pipe is sandwiched between a rotatable bending die and a tightening die capable of revolving around the bending die,
In a bending carriage driving device for supplying the pipe to a bending mechanism that revolves the clamping die and bends the pipe by a carriage that holds one end of the pipe and moves in the axial direction thereof, a shaft of the pipe. A high-speed drive mechanism that locks the carriage on a chain stretched in a direction and drives the chain by a motor to move the carriage, and bends a rack movably supported in the axial direction of the pipe. A drive cylinder that pushes toward the bending mechanism during processing, a first gear that is rotatably supported by the carriage and meshed with the rack, and a swing lever that is swingably supported by the carriage. A second tooth that is rotatably supported, the rotation of the first gear is transmitted in the reverse direction, and that meshes with the rack by the swing of the swing lever. A bending carriage drive device comprising: a push mechanism having a wheel and a lock cylinder that swings the swing lever to mesh the second gear with the rack during bending.