JP7048119B2 - Air gouging tool - Google Patents

Description

The present invention relates to an air gouging tool used by being attached to a welding torch when performing welding work.

The so-called gouging process, in which the metal is melted to perform trenching, groove processing, back fishing, drilling, etc., has been frequently performed in the past for the purpose of removing defects that occur in welded parts. ing.

Normally, such gouging supplies power from the gouging device to the gouging rod deployed in the gouging torch, and the gouging rod is used as an electrode to generate an arc between the gouging rod and the base metal, and the arc heat melts the base metal and the bead. It is done by letting.

In particular, gouging including a step of removing the molten base material and beads by blowing them off with compressed air jetted from the gouging torch along the gouging rod is called air gouging.

In this air gouging, one welding machine is deployed for each worker, but one gouging device is not deployed for each worker because it is used only for removing defective portions. Therefore, every time the worker goes gouging, he / she walks from the welding work position to the installation place of the gouging device, and it is necessary to carry a work tool such as a power cable and a gouging torch.

Due to such a situation, there is an inconvenience that the work efficiency of the welding work is lowered.

On the other hand, the present inventors have proposed the air gouging tool shown in Patent Document 1 in order to improve the work efficiency of the welding work and reduce the equipment cost.

This air gouging tool can be attached to a welding torch, and power can be supplied to the gouging rod by contacting the feeding electrode with the feeding tip of the welding torch.
Then, the operator brings the fed gouging rod into contact with the base material to generate an arc, which melts the base material and the bead by the arc heat, and further blows the molten metal with the compressed air from the compressor. Air gouging work can be performed.
Further, the operator can easily replace and replace the gouging rod by the attachment / detachment mechanism.

Japanese Patent No. 5645180

According to the above-mentioned proposal by the present inventor and the like described above, the worker can use the welding torch for both the welding work and the gouging work, and the work efficiency of the welding work is improved and the equipment cost is reduced.

However, even with the previous proposal, the following problems to be improved still remain.

That is, when it is desired to stop the supply of compressed air depending on the work situation, the operator needs to remove the metal fitting that connects the air hose for supplying the compressed air and the air gouging tool, and the work efficiency is caused by this operation. Is a problem that becomes worse.

The present invention has been made in view of the above-mentioned actual conditions, and provides an air gouging tool in which the work efficiency of air gouging work is greatly improved by making it possible to adjust the supply amount of compressed air at hand. That is the issue.

In order to solve the above problems, the present invention
Equipped with a tool body that can be attached to a welding torch,
The tool body has a conductive portion provided with a feeding electrode capable of contacting a feeding tip of a welding torch, a attachment / detachment mechanism for attaching / detaching a gouging rod, and a gas capable of injecting compressed air toward the tip of the gouging rod. With an injection mechanism,
The conductive portion is configured such that the feeding chip and the gouging rod are conductively connected via the feeding electrode.
In the gas injection mechanism, the inflow portion into which the compressed air flows, the injection port into which the compressed air is injected, the flow path connecting the inflow section and the injection port, and the opening degree of the flow path are adjusted. A possible control valve is provided,
The control valve is characterized in that a valve body formed inside the flow path and an operation unit for controlling the rotational operation of the valve body are formed.

According to the present invention, since the gas injection mechanism is provided with a control valve, the operator can freely adjust the supply amount of compressed air at hand, which greatly improves the work efficiency of air gouging work. It becomes possible.

In a preferred embodiment of the present invention, the operation unit is a rotary knob, and the operation unit is provided with a locking projection that restrains the rotational operation of the operation unit within a predetermined angle range. Features

With such a configuration, it is possible to suppress unexpected rotation of the operation unit, so that it is possible to prevent deterioration of work efficiency and reduce stress during work.

In a preferred embodiment of the present invention, the gas injection mechanism is provided with a joint portion that is detachably attached to the inflow portion and extends the flow path, and the control valve is formed in the joint portion. It is characterized by.

With such a configuration, the operator can use the joint portion alone as an air blow gun when performing general air blowing work in addition to the air gouging work, so that the air gouging tool according to the present invention is versatile. Greatly improved.

A preferred embodiment of the present invention is characterized in that the gas injection mechanism is provided with a plurality of injection ports.

With such a configuration, the mass of the compressed air injected to the tip of the gouging rod increases and becomes stable, so that the operator can more efficiently blow off the molten metal in the air gouging. Become.

In a preferred embodiment of the present invention, the detachable mechanism is provided with a movable member for sandwiching and holding the gouging rod, and the movable member includes a screw mechanism in which a male screw portion and a female screw portion are formed. do.

With such a configuration, the operator can easily attach / detach the gouging rod only by rotating the male screw portion.

In a preferred embodiment of the present invention, a countersunk portion is formed at the tip of the male screw portion, and the diameter of the countersunk portion is larger than the screw diameter of the male screw portion.

With such a configuration, the contact area between the gouging rod and the tip of the male screw portion increases, so that the operator can firmly fix the gouging rod to the attachment / detachment mechanism while preventing the gouging rod from breaking. Will be.

According to the present invention, by making it possible to adjust the supply amount of compressed air at hand, it is possible to provide an air gouging tool with significantly improved work efficiency of air gouging work.

It is a schematic perspective view of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the tool body of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the tool body of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the joint part of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the joint part of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the usage method of the air gouging tool which concerns on embodiment of this invention. It is a figure which shows the usage method of the air gouging tool which concerns on embodiment of this invention.

Hereinafter, the air gouging tool according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7.
The embodiments shown below are examples of the present invention, and the present invention is not limited to the following embodiments. Further, in these figures, reference numeral 1 indicates an air gouging tool according to the present embodiment.

1A and 1B are schematic perspective views of an air gouging tool 1, in which FIG. 1A is a schematic perspective view when the joint portion S is attached to the tool body 11, and FIG. 1B is a schematic perspective view when the joint portion S is detached from the tool body 11. It is a schematic perspective view of.

As shown in FIG. 1, the air gouging tool 1 includes a tool body 11 and has a feeding electrode 11a1 (see FIG. 3) that can contact the feeding tip T2 (see FIG. 6) of the welding torch T (see FIG. 6). A conductive portion 11a provided, a detachable mechanism 11b to which the gouging rod G (see FIG. 6) can be attached and detached, and a gas injection mechanism 11c capable of injecting compressed air C (see FIG. 7) toward the tip of the gouging rod G. ,have.

The conductive portion 11a is configured so that the feeding tip T2 and the gouging rod G are conductively connected via the feeding electrode 11a1.

Hereinafter, specific embodiments of the constituent members of the tool body 11 will be described in more detail with reference to FIGS. 2 and 3.
In FIG. 3, the injection port O is shown by a dotted line. Further, in FIG. 3, the male screw portion m and the operation portion w are not shown in cross section.

As shown in FIGS. 2 and 3, the conductive portion 11a has two feeding electrodes 11a1 and two substantially cylindrical cover portions 11a2.
More specifically, the cover portion 11a2 can be attached to the welding torch T having the nozzle T1 (see FIG. 6), and is substantially perpendicular to the first cover portion a21 that can be externally fitted to the nozzle T1 and the first cover portion. It is formed by a second cover portion a22 connected to the above. The feeding electrode 11a1 is formed by a first feeding electrode a11 provided inside the first cover portion a21 and a second feeding electrode a12 provided inside the second cover portion a22 and in contact with the first feeding electrode a11. Has been done.
For the feeding electrode 11a1, copper, aluminum, a brass material which is an alloy of copper and zinc, or the like is preferably used as the conductive material. Further, as a heat-resistant material, a thermosetting resin such as a polyacetal resin, a phenol resin, a melamine resin, or a urea resin is preferably used for the cover portion 11a2.

Further, the attachment / detachment mechanism 11b is provided with an insertion hole 11b1 through which the gouging rod G is inserted and a movable member 11b2 capable of sandwiching and holding the gouging rod G.
The movable member 11b2 includes a screw mechanism B provided with a male screw portion m and a female screw portion f. Further, the movable member 11b2 is provided at the base end of the countersunk portion d and the male screw portion m provided at the tip of the male screw portion m in addition to the screw mechanism B, and is an operation for easily performing the rotational operation of the male screw portion m. The part w is included.
The diameter D2 of the dish portion d is larger than the screw diameter D1 of the male screw portion m.

Further, in the gas injection mechanism 11c, the inflow portion I to which the joint portion S and the air hose H of the compressor (see FIG. 6) are connected and the compressed air C flows in, the injection port O in which the compressed air C is injected, and the inflow. A flow path R for communicating the portion I and the injection port O is provided.

Hereinafter, a specific embodiment of the joint portion S will be described in detail with reference to FIG.
Note that FIG. 4B is a cross-sectional view taken along the line YY'of FIG. 4A. Further, the joint portion main body S1 and the operation portion A2 are not shown in cross section.

As shown in FIG. 4, the joint portion S is connected to a joint portion main body S1 connected to the inflow portion I, a substantially hexagonal columnar adjusting portion S2 provided with a control valve A, and an air hose H of a compressor. It has a connection portion S3.

The control valve A is provided with a valve body A1 formed inside the control unit S2 and the flow path R, and an operation unit A2 for controlling the rotational operation of the valve body A1.

A through hole r is formed in the valve body A1.

The operation unit A2 is a rotary knob, and is composed of a substantially columnar shaft portion A2a connected to the valve body A1 and a knob portion A2b projecting from the shaft portion A2a in the flow direction of the flow path R. ing.
Further, the operation unit A2 is provided with a locking projection P that restrains the rotational operation of the operation unit A2 within a range of a predetermined angle.

More specifically, the locking projection P is projected from the operation unit A2 in a direction substantially perpendicular to the flow direction of the flow path R, and when the flow path R is in the open state and the closed state, one of the adjustment units S2. It is configured to abut on the sides.

Hereinafter, a method of adjusting the opening degree of the flow path R using the control valve A will be described with reference to FIG.

The operator rotates the knob portion A2b clockwise from a state in which the protrusion direction of the knob portion A2b and the flow direction of the flow path R are substantially parallel, as shown in FIG. 5 (a). From the state, it is changed to the state shown in FIG. 5 (b). That is, the operator makes the projecting direction of the knob portion A2b and the flow direction of the flow path R substantially perpendicular to each other.
By doing so, the flow direction of the flow path R and the penetration direction of the through hole r become perpendicular to each other, and the flow path R changes from a completely open state to a completely closed state. Further, at this time, the first locking surface P1 of the locking projection P comes into contact with one side surface of the adjusting portion S2, and the operator further rotates the adjusting valve A clockwise from the state shown in FIG. 5 (b). You will not be able to make it.

Then, if the procedure reverse to the above procedure is performed, the flow direction of the flow path R and the penetration direction of the through hole r coincide with each other, and the flow path R changes from a completely closed state to a completely open state. Further, at this time, the second locking surface P2 of the locking projection P comes into contact with one side surface of the adjusting portion S2, and the operator further turns the adjusting valve A counterclockwise from the state shown in FIG. 5A. You will not be able to rotate it.

That is, the control valve A is restricted in its rotational operation within a range of 90 degrees by the locking projection P.

The joint portion main body S1 is a general plug-in connection type one-touch joint, and the operator can easily attach / detach the joint portion S to / from the inflow portion I by an internal attachment / detachment mechanism (not shown). Can be done.

The cover portion 11a1, the inflow portion I, the operation portion w, and the joint portion S are covered with an insulating material. Examples of the covering means include alumite processing.

Hereinafter, a method of using the air gouging tool 1 will be described with reference to FIGS. 6 and 7.
Note that FIG. 6B is a partially enlarged view of FIG. 6A. Further, in FIG. 6A, a part of the injection port O and the flow path R is shown by a dotted line. Further, in FIGS. 6A and 6B, only the nozzle T1 and the feeding tip T2 are shown in cross section among the constituent members of the welding torch T.

First, the operator attaches the tool body 11 to the welding torch T, contacts the first feeding electrode a11 with the feeding tip T2 of the welding torch T, and causes the welding wire W from the wire feeding device (not shown). Stop sending.
The welding torch T is used in a semi-automatic welding machine (not shown), and a nozzle T1 and a feeding tip T2 are provided at the tip thereof, and the feeding tip T2 is provided with a feeding hole capable of feeding the welding wire W. T3 is formed.

Next, the operator attaches the gouging rod G to the attachment / detachment mechanism 11b.
More specifically, the operator inserts the gouging rod G into the insertion hole 11b1 and rotates the male screw portion m by the operation portion w to allow the gouging rod G to be inserted into the countersunk portion d and the inner peripheral surface of the insertion hole 11b1. Make it narrow with.

Next, the operator supplies power to the feeding tip T2 of the welding torch T from the welding power supply device (not shown). By doing so, electric power is supplied to the gouging rod G via the feeding electrode 11a1.

Next, the operator connects the air hose H to the connection portion S3 of the joint portion S, and operates the operation portion A2 of the control valve A so that the flow path R is in the open state. By doing so, the compressed air C from the compressor passes through the flow path R from the inflow portion I and flows out from the injection port O, so that the compressed air C is injected toward the tip end portion of the gouging rod G.

By the above procedure, as shown in FIG. 7, the operator can bring the gouging rod G into contact with the base material Z to generate arc heat.
The compressed air C is indicated by a alternate long and short dash line.

Then, the operator can blow off the molten metal by the compressed air C injected toward the tip of the gouging rod G while melting the base metal and the weld bead by the arc heat, which is good for the air gouging work. It becomes possible to do it.

According to the present embodiment, since the control valve A is provided in the gas injection mechanism 11c, the operator can freely adjust the supply amount of the compressed air C at hand, and the work efficiency of the air gouging work can be improved. It will be possible to improve significantly.

Further, since the locking projection P can suppress the unexpected rotation of the operating portion, it is possible to prevent deterioration of work efficiency and reduce stress during work.

Further, since the operator can use the joint portion S alone as an air blow gun when performing general air blowing work in addition to the air gouging work, the versatility of the air gouging tool 1 is greatly improved.

Since the gas injection mechanism 11c is provided with two injection ports O, the mass of the compressed air C injected to the tip of the gouging rod G increases and becomes stable, so that the operator blows off the molten metal in the air gouging. Can be performed more efficiently.

Further, the screw mechanism B provided with the male screw portion m and the female screw portion f enables the operator to easily attach / detach the gouging rod G.

Since the countersunk portion d is formed at the tip of the male screw portion m, the contact area between the gouging rod G and the tip of the male screw portion m increases, so that the operator can gouging while preventing the gouging rod G from breaking. The rod G can be firmly fixed to the attachment / detachment mechanism 11b.

The various shapes, dimensions, and the like of each component shown in the above embodiment are examples, and can be variously changed based on design requirements and the like.

1 Air gouging tool 11 Tool body 11a Conductive part 11a1 Feeding electrode a11 First feeding electrode a12 Second feeding electrode 11a2 Cover part a21 First cover part a22 Second cover part 11b Detachable mechanism 11b1 Insertion hole 11b2 Movable member B Screw mechanism m Male screw Part d Dish part w Operation part f Female thread part 11c Gas injection mechanism I Inflow part O Injection port R Flow path S Joint part S1 Joint part body S2 Adjustment part S3 Connection part A Control valve A1 Valve body r Through hole A2 Operation part A2a Axis Part A2b Knob part P Locking protrusion P1 First locking surface P2 Second locking surface T Welding torch T1 Nozzle T2 Feeding tip T3 Feeding hole W Welding wire G Gouging rod C Compressed air H Air hose Z Base material

Claims (6)

Equipped with a tool body that can be attached to a welding torch,
The tool body has a conductive portion provided with a feeding electrode capable of contacting a feeding tip of a welding torch, a attachment / detachment mechanism for attaching / detaching a gouging rod, and a gas capable of injecting compressed air toward the tip of the gouging rod. With an injection mechanism,
The conductive portion is configured such that the feeding chip and the gouging rod are conductively connected via the feeding electrode.
The gas injection mechanism is detachably attached to an inflow portion into which the compressed air flows, an injection port into which the compressed air is injected, a flow path connecting the inflow portion and the injection port, and the inflow portion. A joint portion extending the flow path and a control valve provided in the joint portion and capable of adjusting the opening degree of the flow path are provided.
The control valve is formed with a valve body formed inside the flow path and an operation unit for controlling the rotational operation of the valve body.
The operation unit is a rotary knob and has a rotary knob.
The operation unit is provided with a locking projection that restrains the rotational operation of the operation unit within a range of a predetermined angle.
A first locking surface and a second locking surface are formed on the locking projection.
The first locking surface comes into contact with the outer surface of the joint portion when the flow path is completely closed by the valve body and is in a closed state.
The second locking surface is characterized in that it comes into contact with the outer surface of the joint portion when it is in an open state in which the flow direction of the flow path and the penetration direction of the through hole of the valve body are perpendicular to each other. , Air gouging tool. The air gouging tool according to claim 1, wherein the feeding electrode forms a part of the flow path. The air gouging tool according to claim 1 or 2 , wherein the gas injection mechanism is provided with a plurality of injection ports. The attachment / detachment mechanism is provided with a movable member for sandwiching and holding the gouging rod.
The air gouging tool according to any one of claims 1 to 3, wherein the movable member includes a screw mechanism in which a male screw portion and a female screw portion are formed. A countersunk portion is formed at the tip of the male screw portion, and a countersunk portion is formed.
The air gouging tool according to claim 4 , wherein the diameter of the countersunk portion is larger than the diameter of the male screw portion. The air gouging tool according to claim 5, wherein an operation portion having a diameter larger than that of the dish portion is formed at the base end of the male screw portion.

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