JP7082807B2 - Welding torch movement mechanism and welding equipment equipped with this - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law Exhibited at the 2018 International Welding Show held from April 25 to 28, 2018.

The present invention is a welding torch moving mechanism for moving a welding torch used in a device for welding a tubular object to be welded, specifically, a pipe (pipe) (hereinafter, simply referred to as a "welding device"). Regarding.

Conventionally, a welding device installed around a pipe and swirling a welding torch in the circumferential direction of the pipe to weld the pipe is known. In such a welding device, the welding torch is configured to move in the axial and radial directions of the welding device or the pipe while turning in the circumferential direction of the pipe. As a welding device having this configuration, there are the following welding devices proposed by the applicant.

JP-A-2017-047458 Japanese Unexamined Patent Publication No. 2013-184176 Japanese Unexamined Patent Publication No. 2016-159356

The welding device of Patent Document 1 includes a welding head swivel gear and first to third ring gears inside an annular housing, and rotates these gears by torque from a motor. When the welding head turning gear rotates, the welding head to which the welding torch is attached moves around the housing in the circumferential direction and turns around the pipe. At this time, when any of the first to third ring gears is rotated by the torque of the other motor, the torch axial movement mechanism or the torch radial movement mechanism operates in conjunction with this, and the welding torch is moved in the axial direction. Or move it in the radial direction.

Further, Patent Documents 2 and 3 disclose a moving mechanism for moving the welding torch in the axial direction or the radial direction (hereinafter, may be simply referred to as a “moving mechanism”). In Patent Document 2, torque from a motor is transmitted to a screw shaft through a torch gear (one of ring gears) and a plurality of gears, and a welding torch connected to a feed nut that moves forward and backward on the screw shaft moves forward and backward. do.

On the other hand, the welding torch disclosed in Patent Document 3 has the axial direction of the welding device with respect to the object to be welded by the torque transmitted from the motor to the reciprocating gear and the torch longitudinal power transmission gear or the torch perspective power transmission gear. Or it is configured to move in the radial direction.

Since the welding torch and its moving mechanism rotate around the housing of the welding device, it is desirable that the welding torch is lightweight for smooth operation of the welding device. However, the conventional moving mechanism has a problem that the structure for moving the welding torch in the axial direction and the radial direction is complicated, the number of parts is large, and the weight is increased accordingly.

Therefore, an object of the present invention is to provide a lightweight and compact welding torch moving mechanism in view of the above-mentioned problems of the prior art.

INDUSTRIAL APPLICABILITY The present invention is used in a welding device for welding an object to be welded, and a welding torch connected to a traveling carriage that turns around the object to be welded by a torque transmitted from a drive device is axially or with respect to a turning axis. In the welding torch movement mechanism that moves in the direction,
The feed nut to which the welding torch is connected, and the feed screw to which the feed nut is screwed and extends in the radial direction,
A first shaft to which torque from the drive device is transmitted, a first output gear provided on the first shaft so as to be movable in the axial direction, and a second shaft to which torque is transmitted from the first output gear. A second output gear connected to the second shaft, a feed input gear meshed with the second output gear at right angles to the second output gear, and a feed input gear connected to the lead screw.
The outer peripheral side screw provided on the outer peripheral side of the second shaft and
The problem is solved by a welding torch moving mechanism characterized in that torque from the drive device is transmitted through external teeth and a gear for axial movement is provided with an inner peripheral screw that meshes with the outer peripheral screw. ..

According to the present invention, the torque from the drive device is applied to the outer teeth of the axially moving gear provided with the outer peripheral side screw on the outer peripheral side of the second shaft and having the inner peripheral side screw that meshes with the outer peripheral side screw. Since it is configured to be transmitted, the number of parts of the welding torch moving mechanism for moving the welding torch in the axial direction or the radial direction can be suppressed, and the weight and size can be made compact.

A cross-sectional view in the axial direction of the welding torch moving mechanism of the first embodiment of the present invention. Partial sectional view in the radial direction of the welding torch moving mechanism of the first embodiment of the present invention. Front view of the welding apparatus of the present invention. The side view of the welding apparatus of this invention. The rear view of the welding apparatus of this invention. Front view of the welding apparatus of the present invention in a state where one housing in the axial direction is removed. Front view of the welding apparatus of the present invention in a state where one housing in the axial direction and the welding head swivel gear are removed. FIG. 6 is a sectional view taken along line 8-8 of FIG.

Examples of the present invention will be described with reference to FIGS. 1 to 8. However, the present invention is not limited to this embodiment.

FIGS. 1 and 2 show the welding torch moving mechanism 20 of the present invention. The welding torch moving mechanism 20 is a mechanism for moving the welding torch 22 in two directions by two types of torques transmitted separately. First, a mechanism in which torque is transmitted to the welding torch moving mechanism 20 will be described below.

3 to 5 are a front view, a side view, and a rear view showing the welding apparatus 10 of the first embodiment of the present invention, respectively. As shown in these figures, the welding device 10 comprises an annular housing 12. The housing 12 is fixed on the outer peripheral surface of the pipe P1 which is an example of the object to be welded by a plurality of fixing members 16 provided in the circumferential direction. The welding device 10 includes a traveling carriage 44 (see FIG. 6), and the traveling carriage 44 is configured to be rotatable along the housing 12. Further, the housing 12 is configured to have facing surfaces 13 and 13 (see FIG. 8) in the axial direction (hereinafter, simply referred to as “axial direction”) of the turning shaft of the traveling carriage 44, and the housing 12 is configured to have facing surfaces 13 and 13 (see FIG. 8) at the top and bottom in the drawing. It can be divided into two (in the figure, the state of being connected by the connecting tool 14 is shown). The housing may be further divided.

As shown in FIG. 4, when the pipes P1 and P2 are welded, the welding device 10 is mounted on either the pipes P1 or P2 (in the figure, it is mounted on P1). On one side (right side in the drawing) of the housing 12 in the axial direction, a plurality of motors M1 to M4 (see also FIG. 5) are connected to the housing 12 via a differential device 30. On the other hand, the welding head 20 is located on the outer diameter side of the housing 12, and the welding torch 22 is located on the other side (left side in the drawing) of the housing 12 in the axial direction. The welding torch 22 is for arc welding an object to be welded such as pipes P1 and P2. In FIG. 2, a cover C is attached in the circumferential direction of the welding device 10.

As shown in FIG. 5, a power supply body 18 into which a power supply conductor (not shown) for supplying electric power to the welding torch 22 is inserted is provided on the surface of the housing 12 on the side where the motors M1 to M4 are mounted. .. The method of supplying electric power or the method of supplying shield gas required for welding is not the subject of the present invention, and thus description thereof will be omitted.

As shown in FIG. 6, a welding head turning gear 40 is provided inside the housing 12. In FIG. 6, for convenience of explanation, the illustrations of the first to third input gears 52, 62, and 72, which will be described later, are omitted. Internal teeth 48 are formed on the entire inner peripheral surface of the welding head turning gear 40. Further, a traveling carriage 44 is connected to the outer peripheral side of the welding head turning gear 40. As will be described later, the welding head swivel gear 40 is rotatably provided with respect to the housing 12, and torque is transmitted from the swivel input gear 42 that meshes with the internal teeth 48. Therefore, when torque is transmitted to the welding head turning gear 40 through the turning input gear 42, the welding head turning gear 40 rotates, and the traveling carriage 44 also rotates in conjunction with the welding head turning gear 40. Since the welding torch moving mechanism 20 is connected to the traveling carriage 44, the welding torch moving mechanism 20 and the welding torch 22 also rotate according to the turning of the traveling carriage 44.

As shown in FIG. 7, the welding device 10 includes annular first to third ring gears 50, 60, 70. In FIG. 7, for convenience of explanation, the above-mentioned turning input gear 42 is not shown. Internal teeth 58, 68, and 78 are formed on the entire inner circumference of the inner peripheral surfaces of the first to third ring gears 50, 60, and 70, respectively. The first to third ring gears 50, 60, and 70 are also rotatable with respect to the housing 12, and the rings first to third input gears 52, which mesh with the internal teeth 58, 68, and 78, respectively, as described later. Torque is transmitted from 62 and 72. Therefore, when torque is transmitted to the first to third ring gears 50, 60, 70 through the first to third ring input gears 52, 62, 72, the first to third ring gears 50, 60, 70 rotate. do. The first to third ring gears 50, 60, and 70 are each rotatably provided with respect to the welding head swivel gear 40 by a predetermined angle. The first to third ring gears 50, 60, and 70 may be rotatably provided with respect to the welding head turning gear 40.

As shown in FIG. 8, the traveling carriage 44 attached to the outer peripheral side of the welding head turning gear 40 pivotally supports the first to third ring output gears 54, 64, 74. As a result, the first to third ring output gears 54, 64, 74 are connected to the welding head turning gear 40 so as to interlock with the welding head turning gear 40. The first to third ring output gears 54, 64, 74 mesh with the external teeth 59, 69, 79 formed on the outer peripheral surfaces of the first to third ring gears 50, 60, 70, respectively. Therefore, when the ring gears 50, 60, and 70 rotate or rotate at different rotation speeds with respect to the welding head turning gear 40, torque is output to the first to third ring output gears 54, 64, and 74, respectively. .. The external teeth 59, 69, 79 may be formed on the entire circumference of the outer peripheral surfaces of the first to third ring gears 50, 60, 70, but the first to third outer teeth 59, 69, 79 may be formed with respect to the welding head turning gear 40. 3 The ring gears 50, 60, and 70 may be formed only on a part of the outer peripheral surface within the range of the rotatable angle.

The torque transmitted to the first to third ring output gears 54, 64, 74 is transmitted to the radial movement gear 80, the axial movement gear 102, and the wire feeding mechanism 24, respectively, as shown in FIG. .. The wire feeding mechanism 24 is provided with, for example, a gear mechanism including a one-way clutch (not shown) inside, and the rotation of any of the first to third ring output gears 54, 64, 74 is forward or reverse. Alternatively, the welding wire (not shown) wound around the wire holder 24a (see FIG. 3) can be fed to the wire guide 24b (see FIG. 3) by the torque in the rotation direction. In order to move the welding torch 22 in the axial direction and the radial direction (hereinafter, simply referred to as “diameter direction”) of the turning shaft of the traveling carriage 44, two ring output gears are sufficient.

The torque transmitted from any of the first to third ring output gears 54, 64, 74 to the radial movement gear 80 of the welding torch moving mechanism 20 is transmitted to the first shaft 84 via the first intermediate gear 82. Will be done. A first output gear 86 is provided on the first shaft 84 so as to be movable in the axial direction on the first shaft. In this embodiment, the first output gear 86 is spline-fitted to the shaft 84.

The torque transmitted to the first shaft 84 is transmitted to the second shaft 92 via the first output gear 86, the second intermediate gear 88, and the third intermediate gear 90. The torque transmitted to the second shaft 92 is transmitted to the feed input gear 96 shown in FIG. 2 through the second output gear 94 connected to the second shaft 92, and finally the feed input gear 96 is connected. It is transmitted to the feed screw 98. The second output gear 94 and the feed input gear 96 are meshed with each other so as to be orthogonal to each other, and the feed screw 98 is arranged so as to extend in the radial direction.

When the feed screw 98 rotates, the feed nut 100 screwed on the feed screw moves back and forth on the feed screw 98. Since the welding torch 22 is connected to the feed nut 100, the welding torch 22 can be moved forward and backward in the radial direction by the torque transmitted to the radial movement gear 80.

Next, a mechanism for moving the welding torch 22 forward and backward in the axial direction will be described. As shown in FIGS. 1 and 2, an outer peripheral side screw 104 is formed on the outer peripheral side of the second shaft 92. On the other hand, as shown in FIG. 1, the welding torch moving mechanism 20 includes an axially moving gear 102, and the second shaft 92 penetrates the inside of the axially moving gear 102. The axially moving gear 102 has an inner peripheral side screw 103 and external teeth, and the inner peripheral side screw 103 meshes with the outer peripheral side screw 104 of the second shaft 92. Torque is transmitted to the axial movement gear 102 from any of the first to third ring output gears 54, 64, 74 through the external teeth of the axial movement gear 102.

When the axial movement gear 102 rotates, the second shaft 92 moves forward and backward in the axial direction according to the rotation direction. Needless to say, the first output gear 86, the second intermediate gear 88, and the third intermediate gear 90 also advance and retreat according to the advance and retreat of the second shaft. Thus, the welding torch 22 can be moved forward and backward in the axial direction by the torque transmitted to the axial movement gear 102.

As described above, the outer peripheral side screw 104 is provided on the outer peripheral side of the second shaft 92, and torque is transmitted to the outer teeth of the axially moving gear 102 provided with the inner peripheral side screw 103 that meshes with the outer peripheral side screw 104. Since the welding torch 22 is configured to move forward and backward in the axial direction, the number of parts of the welding torch moving mechanism 20 can be reduced as compared with the conventional case, and the weight and size can be made compact.

Between the motors M1 to M4 and the housing 12, a differential device 30 (see FIG. 4) for transmitting torque to the turning input gear 42 and the ring input gears 52, 62, 73 is provided. The differential device 20 drives any of the electric motors M1 to M4, and rotates the welding head turning gear 40 and the first to third ring gears 50, 60, 70 in the same direction and the same rotation when the other electric motors are stopped. It is configured to rotate the first to third ring gears 50, 60, 70 at a rotation speed different from that of the welding head turning gear 40 when the motor is rotated by a number and another electric motor is driven. It is also possible to directly connect the motors M1 to M4 to the swivel input gear 42 and the first to third ring input gears 52, 62, 72 without providing such a differential device 30, but the difference is It is preferable to provide the moving device 30 because the welding head turning gear and the ring gear can be rotated by one electric motor, and the control device of the electric motor can be simplified.

The welding device of the present invention may have a configuration symmetrical to that of the welding device 10 described above. That is, first, the welding head turning gear and the ring gear have external teeth on the entire outer peripheral surface of each, and internal teeth are provided on at least a part of the inner peripheral surface of the ring gear. Second, the swivel input gear and the ring input gear are provided so as to mesh with the welding head swivel gear and the outer teeth of the ring gear, and the ring output gear is provided so as to mesh with the inner teeth of the ring gear. Thirdly, the traveling carriage may be provided on the inner diameter side of the welding head turning gear.

Further, the welding apparatus of the present invention is not limited to the one fixed on the outer peripheral surface of the pipe of the object to be welded, and may be fixed to the inside of the pipe via a fixing member. Further, the present invention can also be used as a processing device by attaching a cutting tool instead of the welding torch.

As described above, according to the present invention, it is possible to provide a lightweight and compact welding torch moving mechanism and a welding device including the mechanism.

10 Welding device 12 Housing 20 Welding torch movement mechanism 22 Welding torch 30 Differential device 40 Welding head swivel gear 42 Swing input gear 50, 60, 70 Ring gear 52, 62, 72 Ring input gear 54, 64, 74 Ring output gear 84 1st shaft 86 1st output gear 92 2nd shaft 94 2nd output gear 96 feed input gear 98 feed screw 100 feed nut 102 axial movement gear 103 inner peripheral side screw 104 outer peripheral side screw M1 to M4 drive device (electric motor)

Claims (4)

Used in a welding device that welds an object to be welded, the torque transmitted from the drive device moves the welding torch connected to the traveling carriage that turns around the object to be welded in the axial or radial direction with respect to the turning axis. In the welding torch movement mechanism
The feed nut to which the welding torch is connected, and the feed screw to which the feed nut is screwed and extends in the radial direction,
A first shaft to which torque from the drive device is transmitted, a first output gear provided on the first shaft so as to be movable in the axial direction, and a second shaft to which torque is transmitted from the first output gear. A second output gear connected to the second shaft, a feed input gear meshed with the second output gear at right angles to the second output gear, and a feed input gear connected to the lead screw.
The outer peripheral side screw provided on the outer peripheral side of the second shaft and
The torque from the drive device is transmitted through the outer teeth, and the gear for axial movement is provided with the inner peripheral side screw that meshes with the outer peripheral side screw.
Welding torch movement mechanism. The welding device
With an annular housing,
An annular weld head swivel gear that is rotatably supported by the housing and has internal teeth all around the inner peripheral surface.
With at least two annular ring gears provided with internal teeth on the entire circumference of the inner peripheral surface and external teeth on at least a part of the outer peripheral surface so as to be rotatable at a predetermined angle or more with respect to the welding head turning gear. ,
A swivel input gear that meshes with the internal teeth of the welding head swivel gear and a ring input gear that meshes with the internal teeth of the ring gear, respectively.
A ring output gear that meshes with the outer teeth of the ring gear,
It is equipped with a plurality of motors connected to the housing so as to be located on one side in the axial direction and to transmit torque to the turning input gear and the ring input gear.
The welding torch is located on the other side of the axial direction and
The traveling carriage is connected to the welding head turning gear, and the traveling carriage is connected to the welding head turning gear.
A welding device including the welding torch moving mechanism according to claim 1, wherein the torque from the ring output gear is transmitted to the first shaft and the axially moving gear, respectively. The welding device
With an annular housing,
An annular weld head swivel gear that is rotatably supported by the housing and has external teeth all around the outer peripheral surface.
With at least two annular ring gears provided with external teeth on the entire circumference of the outer peripheral surface and internal teeth on at least a part of the inner peripheral surface so as to be rotatable at a predetermined angle or more with respect to the welding head turning gear. ,
A swivel input gear that meshes with the outer teeth of the welding head swivel gear and a ring input gear that meshes with the outer teeth of the ring gear, respectively.
A ring output gear that meshes with the internal teeth of the ring gear,
It is equipped with a plurality of motors connected to the housing so as to be located on one side in the axial direction and to transmit torque to the turning input gear and the ring input gear.
The welding torch is located on the other side of the axial direction and
The traveling carriage is connected to the welding head turning gear, and the traveling carriage is connected to the welding head turning gear.
A welding device including the welding torch moving mechanism according to claim 1, wherein the torque from the ring output gear is transmitted to the first shaft and the axially moving gear, respectively. A differential device provided between the motor and the housing and transmitting torque to the turning input gear and the ring input gear is provided.
When one of the electric motors is driven and the other electric motors are stopped, the welding head turning gear and the ring gear are rotated in the same direction and at the same rotation speed.
The welding apparatus according to claim 2 or 3, which is configured to rotate the ring gear at a rotation speed different from that of the welding head turning gear when the other electric motor is driven.

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