JP2875774B2 - Open pipe conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor for conveying a plurality of open pipes formed by bending a short plate into a short pipe having a substantially perfect circular shape in advance, to a welding device for welding a slit portion of the open pipe. Related to the device.

[0002]

2. Description of the Related Art Conventionally, when an open pipe is welded by an automatic welding apparatus, slits of a plurality of open pipes previously formed into a substantially circular short pipe by bending a short plate are arranged in a straight line. In this state, there is provided a conveying device which clamps the left and right sides of the open pipe from the outside and conveys the slit at a suitable feed speed to a welding device for welding the slit (see Japanese Patent Publication No. 3-53825).

[0003]

However, in the above-described conventional transfer device, the positioning of the slits of each open pipe in a straight line is performed along a fixed guide inserted and arranged in the slits. Since the operation is performed by guiding the open pipe A, the slit portion moves while sliding on the guide, and the friction due to the sliding affects the smooth conveyance of the open pipe A, and the guide is worn. , Causing poor durability. Further, the wear of the slit portion may be one of the causes of adverse effects on welding performed by the welding device.

[0004]

According to the present invention, there is provided an open pipe conveying apparatus in which a plurality of open pipe slits formed by bending a short plate and forming a substantially circular short pipe in advance are arranged in a straight line. In the conveying device, which conveys the slit to the welding device while holding the left and right sides in a state in which the slit is formed, a plurality of guide pieces inserted into the slit of the open pipe can be circulated in the conveying direction. The guide piece is held by the slit portion of the open pipe by holding the open pipe from both right and left sides, and the open pipe is conveyed in this state.

[0005]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an open pipe.

The open pipe A is formed by bending a short plate into a short pipe having a substantially perfect circular shape in advance, and is positioned by a positioning device (not shown) so that the slit A1 of the open pipe A is positioned at the top. After that, in a state where the plurality of open pipes A are connected and arranged so that the slit portion A1 is linear, the slit portion A1 is sent to the welding device 7 at an appropriate feed speed by the transfer device 1 shown in FIG. After continuously welding the slits A1, the slits A1 are separated into short pipes by a separation device (not shown).

FIG. 1 shows a transfer device for an open pipe according to the present invention.

The conveying device 1 supports a lower portion of the open pipe A and is configured as a conveying surface to the welding device 7, and is disposed on both left and right sides of the receiving guide 2 and supported by the receiving guide 2. Open pipe A to welding device 7
And a guide device 4 provided above the receiving guide 2 and guided to the welding device 7 while positioning the slit portion A1 of the open pipe A at the top. .

The feed mechanism 3 has a forward feed device 3a and a backward feed device 3b arranged on the upstream side and the downstream side in the transport direction.

The backward feeder 3b includes an open pipe A
A pair of left and right clamp members 31 and 31 (see FIG. 2) respectively disposed on the left and right sides of the
And a moving body 33 for reciprocating in the transport direction.

The clamp member 31 has a semicircular inner surface formed on a clamping surface 32 (see FIG. 2). The clamping surface 32 has a radius of curvature substantially equal to or slightly smaller than the outer peripheral surface of the open pipe A. It is formed to have.

The pair of right and left clamp members 31 are arranged in a direction perpendicular to the conveying direction to a clamp position for clamping the outer peripheral surface of the open pipe A from both right and left sides by a cylinder device 31a shown in FIG. It is configured to be movable.

The moving body 33 includes a ball screw 34 disposed below the receiving guide 2 and in the transport direction, a screw portion 35 connected to the clamp member 31 and screwed into the ball screw 34, and a ball screw 34. A drive motor 36 that rotates in the forward and reverse directions.
The pair of right and left clamp members 3 is rotated by the
1 and 31 reciprocate in the transport direction while being guided by the guide 37 shown in FIG.

The forward feed device 3a also includes a pair of right and left clamp members 31, 31 and a moving body (not shown), like the backward feed device 3b.

As described above, the front and rear feeding devices 3a and 3b
The independent operation of the clamp members 31, 31 independently performs the clamping and unclamping of the open pipe A, and also performs the reciprocating operation independently.

The guide device 4 has a plurality of guide pieces 41 provided so as to be able to circulate freely in the transport direction. A predetermined number of guide pieces 41 are provided on an endless chain 42 disposed above the receiving guide 2 and parallel to the transport direction. They are arranged with an interval.

The guide piece 41 is, as shown in FIG.
It is formed in a flat plate shape, and is inserted from above into a slit portion A1 located at the top of the open pipe A.

The endless chain 42 has no driving means such as a driving motor and is simply wound around the front and rear sprockets 43 and 44.

A roller conveyor 5 is disposed at the carry-in end of the receiving guide 2.
Is provided above the feed roller.

The feed roller 6 is composed of two drive rollers for sandwiching the left and right sides of the open pipe A. The two drive rollers are driven to rotate by a drive motor (not shown), so that the open pipe A is opened. Is transported in the transport direction.

The welding device 7 is disposed at the discharge end of the receiving guide 2 and includes a welding jig 71 and a welding torch 7.
9 is provided.

As shown in FIG. 4, the welding jig 71 is formed of a square pole having a through hole 74 penetrating from the rear surface 72 to the front surface 73.
An opening 76 cut out in a letter shape is provided, and a slit 77 cut in the axial direction from the center of the edge on the back surface 72 side of the upper surface 75 to the vicinity of the opening 76 is provided.

In the slit 77, a center guide plate 78 having a length substantially equal to that of the slit 77 is inserted through the through-hole
4 and is fixed by projecting an appropriate length, and the projecting portion engages with the slit portion A1 of the open pipe A to position the open pipe A.

As shown in FIG. 5, the through hole 74 is
From the second side, up to the point where the slit 77 ends, a straight hole 74a having a diameter larger than the diameter of the open pipe A is formed. From the point where the slit 77 ends, the diameter is gradually narrowed. The slit portion A1 is formed in a tapered hole 74b so as to fit tightly, and a straight hole 74c having a reduced diameter is formed from the tapered hole 74b to the front surface 73.

The welding torch 79 is set so that its tip is located above the opening 76 of the welding jig 71 shown in FIGS.

Next, the operation of the thus-configured transfer device 1 will be described.

First, a short plate is bent to form a short pipe (open pipe) having a substantially circular shape in advance, and the open pipe A is continuously conveyed onto the roller conveyor 5.

At this time, each open pipe A is conveyed in a state where it is previously arranged by a positioning device or the like so that its slit A1 is located at the top.

The open pipe A thus arranged on the roller conveyor 5 is conveyed by the feed roller 6 to the receiving guide 2 side, and is continuously transferred to the welding device 7 by the conveying device 1 provided on the receiving guide 2. Conveyed.

Here, the transfer of the open pipe A by the transfer device 1 is performed by the following operation.

First, as shown in FIG. 6A, the rear feed device 3b of the feed mechanism 3 is moved to a position Y slightly behind the foremost position Y1.
2, the forward feeder 3a is disposed at the rearmost position X3, and both feeders 3a and 3b are open pipes A.
In the clamped state where the front feeder 3b is clamped from both sides, the two move forward from this state in synchronization with each other, and when the rear feeder 3b reaches the foremost position Y1 as shown in FIG.
Releases the clamp of the open pipe A, enters the unclamped state, and moves to the rearmost position Y3. At this time, the forward feed device 3a keeps the clamped state and moves forward to convey the open pipe A to the welding device 7 side. Note that the open pipe A disposed behind the forward feed device 3a is conveyed in such a manner that the backward feed device 3b is in an unclamped state, but is pushed backward by the feed roller 6 disposed behind.

Next, as shown in FIG.
Reaches the rearmost position Y3, it again becomes in the clamped state, and clamps the open pipe A disposed at that position. At this time, the forward feed device 3a is arranged at a position X2 slightly behind the foremost position X1, and moves from this position X2 to the foremost position X1 in synchronization with the clamped backward feed device 3b.

Then, as shown in FIG. 6 (d), when the forward feed device 3a reaches the foremost position X1, it enters the unclamped state and moves again to the rearmost position X3.
The state shown in FIG. At this time, the open pipe A on the receiving guide 2 is conveyed while being pushed by the post feed device 3b.

By repeatedly performing such operations of the feed devices 3a and 3b before and after, combined with the feed by the feed roller 6, the open pipe A is conveyed to the welding device 7 in a continuous state.

Here, when the open pipe A is transported by the transport device 1 described above, the guide piece 41 of the guide device 4 is inserted and disposed in the slit portion A1 of the open pipe A, and the front and rear feed devices described above are provided. When the open pipe A is pressed from both right and left sides when the open pipe A is clamped by 3a, 3b, the slit portion A1 is pressed.
Is reduced, the guide piece 41 is connected to the slit portion A1.
It is pinched. As a result, the guide piece 41 circulates and moves following the above-described transport of the open pipe A, and the open pipe A is smoothly transported by this operation with the slit A1 held at the top.

[0037]

As described above, according to the present invention, a plurality of guide pieces inserted into the slits of the open pipe are provided in the transfer device so as to be circulated in the transfer direction, and the open pipe is clamped from both right and left sides. In this way, the guide piece is sandwiched between the slits of the open pipe, and the guide piece is positioned while following the transport of the open pipe, so that the slit and the guide piece move together without sliding. As a result, the conveyance of the open pipe caused by the conventional sliding of the slit portion and the guide is not hindered, and a decrease in durability due to wear of the guide can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing a transfer device for an open pipe.

FIG. 2 is a front view showing a transfer device for an open pipe.

FIG. 3 is a perspective view showing an open pipe.

FIG. 4 is a perspective view showing a welding jig.

FIG. 5 is a sectional view showing a welding jig.

FIG. 6 is an explanatory diagram illustrating an operation of a feed device before and after forming a feed mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveying device 2 Receiving guide 3 Feeding mechanism 3a Forward feed device 3b Reverse feed device 4 Guide device 41 Guide piece 7 Welding device A Open pipe A1 Slit part

Claims (1)

(57) [Claims] 1. A short plate is bent and a plurality of open pipes formed in advance into a substantially circular short pipe are arranged in a straight line. A plurality of guide pieces inserted into the slit portion of the open pipe so as to be circulated in the transport direction, and by holding the open pipe from both right and left sides. An open pipe conveying device characterized in that the guide piece is sandwiched between slits of the open pipe and the open pipe is conveyed in this state.