JPS5978730A - Hot bender for pipe - Google Patents

Abstract

PURPOSE:To obtain a hot bender for a pipe which provides powerful thrust and bending moment to an existing hot bender for a pipe and increases its capacity by adding a relatively simple device thereto. CONSTITUTION:The operation of driving the 1st propulsion device 13 and the 2nd propulsion device 14, acting a thrust P1 on a pipe 1 by the device 13 and a thrust P2 by the tensile force of the device 14, heating locally the pipe 1 in an annular shape by a heater 3 while propelling the pipe 1, and cooling the pipe right after the heating is continuously performed to apply bending moment on the pipe 1 thereby bending the pipe. The thrust that propels the pipe 1 is applied thereon by the two devices 13, 14, and the device 14 acts an arm 12 so as to pull the same in the direction of the rotating axis of bending arms 7, 8 and therefore the thrust and bending moment are increased and the capacity thereof is considerably increased.

Description

[Detailed Description of the Invention] The present invention is a relatively simple device for existing hot pipe bending devices. Add that ability? This invention relates to a greatly increased hot tube bending device.

Conventionally, the hot tube bending device, which is often used for bending metal tubes, has two components: a propulsion device that propels the metal tube from the rear end of the metal tube to be bent, and a guide that moves the metal tube while gripping it in its longitudinal direction. a frame, a heating device for locally annular heating from the outside of the gastric tube at the front end of the guide frame, and a front end of the tube? Clamping device to grasp? Is there a center of rotation within or near the plane containing the heating device W? There is one consisting of a bent arm with a What is the bending moment in the tube to be bent in this hot tube bending machine? This can be done by using two pairs of rollers installed near the heating device on the guide frame, or by using two pairs of rollers, as shown in FIG. One roller 4 is provided on the front end side of the guide frame 2 to be moved while gripping, and is also provided near the heating device 3, and one roller 4 is provided on the rear end of the tube 1 on the guide frame 2. There are methods using the tail stock 5 that can slide in the longitudinal direction of the tube 1, but the first method is f'LK1. However, the bending moment (k) is still applied to the pipe 1 by the guide frame and rollers.

The conventional pipe bending equipment described above can bend some metal pipes very well depending on the type of pipe. It is impossible to perform such bending with conventional equipment, and it is impossible to perform such bending with conventional equipment. ! If we were to create a device that can satisfy the self-requirements 'ff, the weight of the entire device would be significantly large and a large equipment cost would be required.

This project was developed based on the above-mentioned circumstances, and the thrust and bending moment is strong, and the hot bending method, which can be obtained relatively easily even by modifying the existing hot pipe bending equipment, is difficult to make snow. Is it intended to provide a tilted tube whose configuration is one that should be bent? The first propulsion device that propels from the rear end and the said tube? a guide frame that is moved while holding it in its longitudinal direction;
A heating device that locally annularly heats the tube from the outside on the front end side of the guide frame, and a clamp device that grips the front end of the tube? What about the heating device? Is the center of rotation within or near the containing plane? The rear end of the tube with a bent arm?
The clamp ke to be gripped extends in the lateral direction of the limb tube, ζn, 7
h arm and between a point on the nuclear arm equidistant from the center of the tube to the effective bending radius of the bending arm and the center of rotation of the bending arm? and a second propulsion device which tensions each other and adjusts the tension appropriately to limit the thrust of the first propulsion device to an appropriate value.

Next, a first embodiment of the present invention will be explained with reference to FIG.

In FIG. 1, 1 to 5 are as described above, 1 is a tube to be bent, 2 is a guide frame for grasping and moving the limb, and 6 is a guide frame provided on the front end side of the guide frame 2. an annular heating device integrally equipped with a cooling device, 4 a roller disposed near the heating device 3, 5 a tailstock capable of sliding in the longitudinal direction of the tube 1 on the guide frame 2; 7 is a clamp that grips the front end of the tube 1, and 7 is the clamp 6? The description loaded on the tenth - bending arm, 0 is the crime - 2 or more 1 at the center of rotation of bending arm 7
7 to 7 and a first propulsion device to be described later constitute an example of a conventionally known hot tube bending device.

Therefore, this conventional device is modified as follows.
For example, the device of the present invention can be constructed. That is, in FIG. 1, 8 is a second bending arm fixed to the clamp 60 and connected to the second bending arm 7, 9 is a holder that connects both bending arms 7.8, and 10 is a second bending arm that is connected to the first bending arm 7. The settings are as above.
Bending arm 7 and center of rotation 0? A common pivot, 11, is a clamp that grips the rear end of the tube 1 and is supported by the tail stock 5 to allow slight angle rotation; 12 is a clamp 12 fixed to the side of the tube 1; 13 is a first propulsion device usually consisting of a roller chain and its drive device; 14 is a holder 9 and an arm 12;
15 is a support device for the arm 12, 16 is a rail that guides the support device 15, 17 is a bracket attached to the rear of the second propulsion device 14, and 18 is an underframe. , the bracket 17 is connected to the pivot 19. Swinging rod 20. 22 brackets are supported via a pivot 21 to support the second propulsion device 14. and n are the center position 23 of the drive section 14a of the second propulsion device 14 due to the slight rotation of the clamp 11.
This is to accommodate the slight displacement of .

Incidentally, the first propulsion device 13 mentioned above is normally arranged on both sides of the pipe 1 as shown in FIG. 4, but in the present invention, as shown in FIG. 3.

Place it only on one side of the pipe 1, and place it on one side 2 of the guide frame 2.
a'5 cut l1llTge nld', side arm 12 of clamp 11? It is possible to extend it straight to the side. In this way, the second RE propulsion device 14 provided on the arm 12 can avoid increasing the thrust of the first propulsion device 16 too much and straighten the arm 12 to increase the capacity of the M-shaped arm 12.
'f It is preferable from a mechanical point of view to make it thicker by that amount, but if it is difficult to modify the existing equipment as shown in Fig. 5 due to the structural engineer or other reasons, even if it is made as shown in Fig. 4, the There is no problem.

Therefore, in the case of K as shown in FIG. 4, the height of the center of the second propulsion device 14 is higher than the height of the center of the tube 1.
This is because the thrust PIIC of the first propulsion device 13 is offset by the overturning moment, the thrust P of the second propulsion device 14, which tends to tilt the central axis of the bending arm 7 forward. By this, the arm 12 can be adjusted by that offset.
This has the advantage of increasing the center height and making the structure easier. However, in the case of small radius bending, it is better to do as shown in Fig. This is a good group because it allows you to get close to them.

Penetrated. Is the second propulsion device ff14 a roller chain like the first propulsion device 16? However, other steel cables, racks and binions, etc. can also be used as appropriate, and in some cases, hydraulic cylinders? The hot tube bending apparatus of the present invention configured as described above may be used for tube 1
are set as shown in the first figure, and the first propulsion device 13. The second propulsion device 14 is fully driven, the first propulsion device 13 generates a thrust P, and the tensile force of the second propulsion device 14 generates a thrust P, ?
, act on tube 1, and the tube 1? Heating device 3Vc while propelling
By continuously heating the hot tube 1 locally in an annular shape and cooling it immediately after heating, the IK curve of the tube is changed to moment ? It is applied and bent, but tube 1? The thrust for propulsion is given by the first and second propulsion devices 13 and 14, and the second propulsion device 14 bends the arm 12 and acts to pull it in the direction of the rotation axis of the arms 7 and 8. Therefore, the thrust and moment of the bending will be strong, and the performance of the conventional pipe bending will be lower than that of the device. It can be increased significantly.

Therefore, the thrust P of the first propulsion device 14 is the same as that of the first propulsion device 1.
It is assumed that the thrust force P of 3 is limited to the target value and adjusted so that it can be obtained. By doing this, the first bending arm 7 is mainly connected to the pipe 1? The weight of the rotating part including ikw is supported, and the bending required for the second bending arm 8 is the majority of the moment? Uke has a powerful thrust and song is Momen)? This makes it possible to perform the required bending process, and in the actual bending process, the thrust of the first propulsion device and the thrust of the second propulsion device are kept at a substantially constant ratio, or the thrust of the first propulsion device is The thrust of the Km2 propulsion device so that it becomes almost zero? It is desirable to control it.

In the above embodiment, an example was described in which an existing device was modified, but is it possible to actually modify an existing device to increase the thrust and the bending moment? For example, the thrust is 60 tons, the moment is 150 tons, met
The weight of the existing equipment for the er is approximately 60 tons, while the weight of the additional equipment required to increase the total thrust to 150 tons, 400 tons, meter is approximately 50 tons, thrust 1
The weight per ton is: Existing equipment 6 [1 ton / 60 ton ” 1
Additional equipment: 30 ton / 90 ton=i
73, the thrust force can be increased by using the existing equipment 173.

Since the present invention is as described above, what are the two powerful thrusts and moments? The present invention is suitable as a device for bending metal tubes as required, and can be obtained by relatively easily modifying existing devices, making it extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of the hot tube bending apparatus of the present invention. FIG. 2 is an elevational view showing the state of connection between the first bent arm and the second bent arm of the device shown in FIG. FIG. 4 is an elevational view showing another embodiment of FIG. 3. 1... Pipe, 2... Guide frame, 6... Heating device, 4...
...Roller, 5...Tail stock% 6...Clamp, 7...First bending arm, 8...Second bending arm, 9...
... Holder, 10... Pivot % 11... Clamp, 12... Arm, 13... First propulsion device, 14.
...Second propulsion device, 15...Support device agent Yoshikuni Koizumi Figure 2 Figure 5 Figure 4

Claims (1)

[Claims] 1. A pipe to be bent? The first propulsion device that propels from the rear end and the said tube? # On the guide frame that is gripped and moved in the longitudinal direction, the tube is
a heating device that locally heats annularly from 411, and a bending arm that includes a clamp device that grips the entire front end of the tube and has a center of rotation within or near a plane that includes the heating device;
an arm extending in the lateral direction of the limb canal and having a clamp for gripping the rear end of the tube, and a point on the arm that is equidistant from the center of the tube to the effective radius of the bending arm; Between the center of rotation of the bent arm? mutually pulled together. This tensile force? Properly adjust the thrust of the first propulsion device?
A hot tube bending device characterized by consisting of a second propulsion device that limits the value to an appropriate value. 2. A clamp device that grips the front end of the tube to be bent.
and said tube? Is it possible to support heavy metals including rotating parts? It is necessary to fix the main purpose of the bending arm to one side of the clamping device, extend parallel to the bending arm, and fix it to the bending arm at the center of rotation of the bending arm. How loud is the bending moment? Does Uke have a second bent arm? Apparatus according to claim 1 comprising: 3 Push the second propulsion device so that the thrust of the first propulsion device and the thrust of the second propulsion device maintain a substantially constant ratio]? A device according to claim 1 or 2, comprising a controlling device 1. 4 Calculation - The thrust of the VC second propulsion device to keep the total thrust of the propulsion device approximately zero? A device to control? Apparatus according to claim 1 or 2 including: