JPS643579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the manufacture of pipes and rods;
More particularly, the present invention relates to a pipe bending machine for bending and coiling pipes and rods into packages. Such machines can find applications such as output devices in tube welding machines or tube rolling machines.

Prior art machines for pipe bending currently in use are designed to obtain pipe coils with uniform diameter turns or to process short lengths of pipe. What these machines lack is a device for placing the pipe convolution into a coil, and also for placing the convolution in the case where its mechanical properties or cross-section are changing for the length of the pipe being bent. A device for maintaining a preselected diameter of. As a result, the coils so obtained are characterized by convolutions of non-uniform diameter, are not sufficiently compact and, moreover, when they are used subsequently, as a result of intertwining their convolutions with each other. This results in pipe breakage and reduced processing speed and efficiency of pipe finishing machinery such as drawbenches, coiled pipe surface treatment equipment, etc.

Previously known drawing and bending machines have a mandrel holder with a mandrel, a driven drum for receiving the pipe being bent, and a pipe feeding and pipe coil carrying device. However, the pipe coil produced by this device has a non-uniform diameter convolution, the diameter value of which depends on the force applied during the drawing bending operation, the cross-section and pipe wall thickness, or the diameter of the pipe being bent. Depending on mechanical properties, etc., it may be greater or less than the diameter of the coil-carrying drum.
The resulting coil lacks compactness and the pipe turns forming the coil tend to become entangled with each other, thereby interfering with subsequent processing of the coil, especially for pipes of considerable length and small cross-sectional diameter. Significant in cases of

Wire coilers are also known. The machine comprises a bending capstan or block, a guide and pressure roller device, an electric drive,
and a bending device including a coil carrying device.
The disadvantages inherent in this machine are nearly identical to those in the previously described device. Furthermore, this machine can
Does not have a coil placement device to create tightly packed bundles or packages without intertwining the coils.

Other known machines for rolling and bending short lengths of pipe include a support frame, a pipe bending device, and a drive device.

Still other prior art pipe bending machines include a bending device in the form of a pipe feed rate setting device and a plurality of rollers disposed on a frame, one of the rollers being a bending roller. and a drive for applying motion to the bending rollers in the pipe bending plane from one die block by means of follower rollers and guides. The die block of this machine operates to set the bending rollers at a certain position in the bending plane, but when the mechanical properties of the pipe being bent or its cross section change,
This set position cannot ensure a preselected bending radius.

The machine described above can also process pipes of limited length determined by the length of the mold block. Therefore, this machine cannot be used to bend longer pipes.

The present invention aims to provide a pipe bending machine that makes it possible to process relatively long and variable cross-section pipes, independent of variations in the mechanical properties along the length of the pipe, The resulting pipe bundle or coil has a preselected convoluted diameter and is compact enough to allow subsequent processing of the coiled pipe at high feed rates on a draw bench or in a particular pipe processing line without entangling with each other. be able to.

This is achieved by: a bending device with a pipe feed speed setting device, a bending device with a bending roller and a drive for moving it in a bending plane, and a follower coupled with said drive for moving said bending roller. In a pipe bending machine having rollers and a pipe coil pedestal, according to the invention the following roller cooperates with the pipe essentially later than the bending roller along the path of travel of the incoming pipe. was made to
and fixed to one arm of one two-arm lever, the pivot axis of the two-arm lever intersects the center line of the incoming pipe, and the other arm of the two-arm lever moves the bending roller. A movable contact of the drive for moving the bending roller is alternately engaged with one of two stationary contacts of the drive for moving the bending roller.

Preferably, the movable contact of the drive for moving the bending roller is adapted to move along the arm length of the two-armed lever.

The movable contact has means for imparting reciprocating motion to the movable contact along the arm length of the two-armed lever within limits determined by preselected inner and outer diameters of the pipe coil. be able to. or a stationary contact of a drive for moving said bending roller reciprocates relative to said movable contact within limits determined by a preselected inner and outer diameter of said pipe coil; It is placed on a pedestal shaped like this.

Preferably, the coil pedestal is adapted to reciprocate synchronously with the bending roller in a plane essentially parallel to the plane of the bending pipe in the direction of movement of the bending roller.

In order to obtain a compact coil bundle, the pipe bending machine is located approximately in the pipe bending plane;
an overhanging guide structure having a length at least equal to the maximum coil diameter; the guide structure may have idler rollers to support pipe turns toward said coil cradle and to allow free movement thereof; can.

The pipe bending machine according to the invention is capable of coiling into bundles pipes of practically any length and pipes with varying cross-sectional diameters along their length, regardless of their varying mechanical properties. enable.

This machine is capable of making pipe bundles with preselected coil diameters that are compactly placed in bundles.

Hereinafter, a pipe bending machine according to the present invention will be exemplarily described with reference to the accompanying drawings.

1, 2 and 4, the pipe bending machine according to the invention comprises a device 1 for feeding a pipe 2, a guide roller 3, a bending roller 4 and a pipe to be bent. and a pipe bending device including a drive device 5 for imparting forward or backward movement to the bending rollers 4. The device for controlling the convoluted diameter of the pipe 2 is
A following roller 6 is adapted to contact the pipe 2 at the rear of the bending roller 4 along the traveling path of the
and a two-arm lever 7. These follower rollers 6 and two-arm lever 7 detect the position of the pipe being bent, provide feedback to the movable contacts of the electric circuit of the drive device 5, and adjust the amount of forward and backward movement of the bending roller 4. functions. At this time, the follower roller 6 is in contact with the inner peripheral surface of the pipe being bent and can transmit a sufficient moment to the two-arm lever 7. One arm of the lever 7 is equipped with the following roller 6, and the other arm is equipped with the following roller 6.
Electric circuit for operating the drive device 5 (see Figure 3)
It has a movable contact 8, which is in electrical communication with a stationary contact 9 or 10 of the electrically conductive material, such that, when electrically connected, the drive device 5 is moved forward or backward toward the pipe to be bent. ing. These stationary contacts 9 and 10 are separated by a plate 11 made of electrically insulating material.

The pipe bending machine further has a guide structure 13 fixed to and extending from the frame 12 thereof,
This guide structure has idler rollers 14.
The frame 12 includes a spring 15 for elastically pressing the two-arm lever 7 into the initial position, a limiter 16 for limiting the movement of the two-arm lever 7, and a switch for disengaging the drive of the bending roller 4. - Has an off sensor 17 and a switch on sensor 18.

A coil cradle device 19 (Figs. 1 and 4) is used to collect the coils of the pipe that are being bent.
), which has identical contacts 8, 9 and 10
It has a drive device 20 controlled by.

In order to obtain a tightly packed coil with the required outer and inner diameters, the structure of this pipe bending machine includes a drive 5 for applying motion to the pipe bending rollers 4 and a drive unit 5 for rotating the coil cradle 19. The movable and stationary contacts 8, 9 and 10 are arranged for forced movement in order to control the drive device 20. This is done by moving the movable contact 8 (FIG. 5) along the length of the two-armed lever 7, which includes a rack 21 and a separate drive 23.
A gear 22 and a drive reversing switch 24 connected to the
The stationary contacts 9 can be connected to the stationary contacts 9 using any known drive of suitable construction, such as a rack-and-gear drive with 25, or any drive of conventional design as shown in FIG. , 10 may be moved, which includes a threaded rod 26, a nut 27 connected to a separate drive 28, and a limit or reversal switch 29, 30 for reversing the rotation of the drive 28. have.

The pipe bending machine according to the invention operates as follows.

The pipe 2 (FIG. 1) is transported at a low feed rate via the pipe feed device 1 and the guide rollers 3 into contact with the bending rollers 4. During this time, the bending roller 4 and the following roller 6 remain in their initial positions, as illustrated in FIG. 2, and the device 5 for imparting a movement to the bending roller 4 is deenergized. The drive device 5 is then energized by a switch-on sensor 18 of any conventional construction, such as a photoelectric sensor or a limit switch adapted to cooperate with the leading end of the pipe 2. Drive device 5
(Fig. 2), the movable contact 8 is in electrical contact with the stationary contact 9, so the bending roller 4
is moved in a direction from left to right to bend pipe 2. During this bending process, the following roller 6 moves to the right in cooperation with the pipe being bent, causing it to pivot about the center of rotation of the two-armed lever 7, which center of rotation is located along the length of the pipe 2. Since it is aligned with the center line, move the movable contact 8 downward across the stationary contact 9. When the contact point 8 moves to the insulating plate 11 (FIG. 3), the electric circuit is disconnected and the drive device 5
is deenergized to fix the bending roller 4 in its current position, so that the coil of pipe being bent has the required diameter.

In this way, the follower maintains the pipe coil diameter set point. For example, if the section of pipe entering the bending device is less stiff than the section that has already passed through the device, the pipe convolution diameter begins to decrease. This will also result in moving the follower roller 6 to the right, whereby the lever 7 will cause the movable contact 8 to engage the stationary contact 10. This operation energizes the drive device 5,
Moving the bending roller 4 to the left, increasing the diameter of the pipe coil, continues until the follower roller 6 returns to the set position, and the contact 8 will move upwards until it enters the insulating plate 11. Thereafter, the drive 5 is deenergized and the bending roller 4 is fixed in position.

The follow-up device operates similarly to correct the coil diameter to the set value when the bending device is entered with a more rigid section of pipe to be bent. In such a case, the coil diameter will tend to increase and the follower roller 6 will be moved to the left. As a result, contacts 8 and 9 close the circuit of drive 5 and bending roller 4 starts a movement to the right,
The diameter of the pipe coil will be reduced until the diameter of the pipe coil is the required value.

To set the required diameter of the coil, the movable contact 8 is moved along the arm length of the lever 7 to a suitable position and is fixed or stopped in that position by any known device, such as a screw.

In order to eliminate damage to the pipe coil surface and to avoid twisting the incoming pipe 2, the pipe coil after passing through the bending rollers 4 is moved along the guide structure 13 to one of the idle rollers 14. transferred,
Next, it is lowered onto the coil holder 19. After the pipe 2 is placed on the substantially disk-shaped coil holder 19 that can rotate on its axis, the pipe 2 is placed on the holder 1.
Rotate 9 around its own axis. This axis of rotation approximately coincides with the central axis of the pipe coil in a direction perpendicular to the pipe bending plane.

In order to place the coil coaxially with the coil cradle 19 when the diameter of the coil changes, this coil cradle 19 is moved by the bending roller 4 by means of a drive 20 and an arrangement of movable and stationary contacts 8, 9 and 10. is made to move accordingly in the direction of motion. That is, their contact points are connected to the drive device 5 of the bending roller 4.
energizing drive 20 and reversing it essentially as previously described with respect to FIG. pipe·
To reduce the diameter of the coil, move the bending roller 4 in the direction from left to right and also move the coil cradle 19.
This is achieved by moving the bending roller 4 in the direction of the bending roller 4, ie in the right-to-left direction. Conversely, in order to increase the coil diameter, the bending roller 4
is moved to the left, and the coil holder 19 is moved to the right.

In order to obtain a tightly packed coil wound in several rows with respect to the bending plane, a forced movement of the movable and stationary contacts 8, 9 and 10 of the drive 5 which exerts a movement on the bending roller 4 is carried out inside the coil. and within the limits determined by the outer diameter. For this purpose, various devices are possible, as explained below.

Referring to a variant illustrated in FIG.
It is varied within set limits by subjecting the movable contact 8 to a reciprocating movement along the length of the lever 7. Rack 21 cooperates with contacts 24, 25 of a reversing switch which reverses drive 23 and changes the direction of movement of rack 21 and contacts 8. As a result of the change in the position of the contact 8 on the arm of the two-armed lever 7, the drive 5 of the bending roller 4 is energized via the contacts 9 and 10, so that the bending roller 4 increases or decreases the diameter of the coil. is moved in the bending plane as follows.

In one variant shown in FIG. 6, the diameter of the coil turns is changed as a result of moving the platform carrying the stationary contacts 9 and 10, this movement
This is performed by the nut 7 and the nut drive device 28. Contacts 9 and 10 cooperate alternately with contact 8 to energize drives 5 and 20 accordingly as they move together with the platform. These drives 5 and 20 change the diameter of the coil,
They act simultaneously to move the coil cradle 19, ensuring coaxiality between the coil convolution and the coil cradle 19, thereby imparting a change in coil diameter within preselected limits.

When the rear end of the pipe 2 enters the pipe feeder (FIG. 1), an optional switch-off sensor 17 (e.g. a photoelectric sensor or a limit switch) disengages the follower and bends. energizing the drive 5 of the roller 4 to move it to its initial position (FIG. 2), disengaging the drive 20 of the coil cradle and spreading the rollers of the pipe feeder 1 and the rollers 3 of the bending device; Then, the rear end of the coil pipe is released, and the completed coil is removed from the coil holder. The two-armed lever 7 is also biased to the left by the action of the spring 15 into its initial position as best shown in FIG.

When the leading end of the following pipe 2 approaches the pipe feeding device 1, the cooperation of the pipe 2 and the sensor 17 causes the rollers of this device to be moved towards each other and into contact with the pipe 2. It operates to feed the pipe 2 to a bending device when bent. As a result of the cooperation of the leading end of the pipe 2 with the sensor 18, the drive 5 of the bending roller 4 is energized, and when the movable contact 8 passes through the insulating plate 11, the drive 20 of the follower and the coil cradle is activated. engage. The subsequent operation of the pipe bending machine is the same as described above.

[Brief explanation of drawings]

1 is a plan view of a pipe bending machine according to the invention; FIG. 2 is a top view of the bending device and follower device of the pipe bending machine in the first stage of the bending operation; and FIG. 3 is a top view of the bending device and follower device for moving the bending rollers. FIG. 4 is a side view of a pipe bending machine, and FIG. FIG. 6 is a plan view of a two-arm lever with a movable contact, a stationary contact and its drive. 2...Pipe, 4...Bending roller, 5...Drive device for moving the bending roller, 6...Following roller, 7...Two-arm lever, 8...Movable contact, 9,
10... Stationary contact, 13... Guide structure, 14...
...Idle roller, 19...Coil holder.

Claims (1)

[Scope of Claims] 1. A bending device comprising a pipe feeding speed setting device, an electric drive device 5 for advancing a bending roller 4 in a bending plane toward the pipe to be bent, and A two-arm lever 7 for controlling the drive device 5 that moves the roller 4; and a follow-up roller 6 attached to the end of one arm of the two-arm lever and capable of contacting the inside of the pipe to be bent.
and a pipe/coil pedestal 19, wherein the following roller 6 contacts the inner surface of the pipe 2 behind the bending roller 4 along the traveling path of the incoming pipe 2. , the pivot axis of the two-arm lever 7 is set at a position intersecting the center line of the incoming pipe 2, and a movable contact 8 is attached to the other side of the two-arm lever 7. A pipe bending machine, characterized in that the drive device 5 for moving the bending roller 4 is alternately brought into contact with one of two electrically driven stationary contacts 9 or 10. 2. The movable contact 8 of the electric circuit that operates the drive device 5 for moving the bending roller 4 is configured to move along the arm length of the two-arm lever 7. Pipe bending machines described in Section. 3 said movable contact 8 is adapted to apply a reciprocating motion to said movable contact 8 along the arm length of said two-armed lever 7 within limits determined by preselected inner and outer diameters of said pipe coil; A pipe bending machine according to claim 2, characterized in that it has a device. 4 The stationary contacts 9 and 10 of the drive for moving the bending roller 4 are relative to the movable contact 8 within the limits determined by the preselected inner and outer diameters of the pipe coil. 2. The pipe bending machine according to claim 1, wherein the pipe bending machine is arranged on a table which is adapted to reciprocate. 5. A claim characterized in that the coil pedestal 19 is configured to reciprocate in a plane substantially parallel to the plane of the pipe bent in the moving direction of the bending roller 4, in synchronization with the bending roller 4. A pipe bending machine according to any one of items 1, 2, 3, and 4. 6 having an overhanging guide structure 13 located substantially in said bending plane and having a length at least equal to the maximum coil diameter, said guide structure supporting the pipe convolution towards said coil cradle 19 and preventing its free movement; Claims 1 and 2 are characterized in that the guide roller 14 is provided to allow the
The pipe bending machine according to any one of Items 1, 3, 4 and 5.