JPS6320456Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic gas cutting machine that uses cutting gas to drive the cutting machine.In particular, the invention uses cutting oxygen to rotate a rotor, and the rotational force drives the wheels. Concerning what has been done.

Conventionally, as shown in Japanese Patent Publication No. 53-40936, this type of cutting machine has introduced a directional control valve in the cutting oxygen conduit to introduce cutting oxygen into the rotor chamber as two systems, with each flow flowing through both systems. A passage opening/closing valve is disposed, and by operating the passage opening/closing valve, cut oxygen is jetted into the rotor chamber, thereby rotating the rotor in either forward or reverse directions, and the rotational force thereof drives the wheels.

However, with this system, the two flow path opening/closing valves installed in both systems were operated individually, and the speed was adjusted by the cutoff oxygen supply ratio from both systems to the rotor chamber. Adjusting the opening of the road opening/closing valve is troublesome, and since the rotor is formed of an impeller and the cutting oxygen jet is blown onto the blades, the cutting oxygen is shut off by the tip of the blade of the impeller. There is a problem in that a situation occurs in which the cutting oxygen is not sent to the cutting nozzle momentarily, causing pulsation of the cutting oxygen and deteriorating the cutting performance. This is particularly likely to occur when cutting thick materials at low speeds.

Further, when cutting thin materials, the amount of cutting oxygen required is small, but if the amount of cutting oxygen ejected into the rotor chamber is small, there is a problem in that the impeller is difficult to start rotating, impairing running performance.

The present invention was proposed in view of the above points, and in order to enable the rotor to rotate at a uniform speed and to easily control the rotational direction of the rotor, the rotor and drive wheels are connected. A plurality of wind receiving surfaces are provided on the outer circumferential surface of the rotor, connected through a speed regulating mechanism and a deceleration mechanism, and are offset in the axial direction. The wind blowing hole is formed into an oval shape having a long axis in the circumferential direction of the rotor, and the bottom wall of each wind blowing hole is formed into a chevron shape having an inclined surface in the circumferential direction, and the top of the chevron shape is located within the wind blowing hole, The wind blowing holes on the wind blowing peripheral surfaces that are adjacent to each other are positioned so as to be shifted by half a pitch, and the cutting oxygen inlets are arranged on the inner peripheral surface of the rotor chamber in correspondence with each wind blowing peripheral surface, and the cutting oxygen inlets are connected to each cutting oxygen inlet. The control valve that controls the oxygen supply of the rotor is configured to be operable in conjunction with each other, and a rotation starting aid is disposed on the outside of the rotor circumferential surface.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an overall perspective view, FIG. 2 is a cross-sectional view taken along the line of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line of FIG.
This automatic gas cutting machine has a driving wheel 1 and a driven wheel 2.
A cutting nozzle 4 is supported by a main body frame 3 equipped with a main body frame 3 so as to be able to adjust its position, and a driving force generating device D and a running speed control device C are arranged in the front and rear on the upper part of the main body frame 3.

The driving force generating device D houses a cylindrical rotor 7 in a rotor chamber 6 formed in a casing 5, and a worm 9 is fixed to the tip of a rotating shaft 8 that rotates integrally with the rotor 7. While communicating and connecting the inlet 10 with the cutting oxygen inlet 11,
The rotor chamber 6 and the cutting oxygen outlet 12 are connected to each other by a cutting oxygen outlet 13.

The traveling speed control device C also regulates the amount of movement of the centrifugal weight type governor device G supported by the aforementioned rotating shaft 8 that rotates integrally with the rotor 7, and the sliding flange 14 of this governor device G. The regulating device B controls the rotation of the rotary knob 15.
The swinging motion of the rocking plate 17 is converted through a cam connected and fixed to the pair of bevel gears 16a, 16b and the driven bevel gear 16b, and the pad 18 attached to the tip of the rocking plate 17 moves. sliding flange 14
The rotational speed of the rotating shaft 8 is maintained constant by contacting the rotating shaft 8.

A worm 9 fixed to the tip of the rotating shaft 8 is engaged with a worm wheel 19 of the reduction mechanism M,
The speed reduction mechanism M and the axle 20 of the drive wheel 1 are interlocked and connected via a clutch 21.

FIG. 4 is a cross-sectional plan view of the cutting oxygen supply section to the rotor chamber 6, in which a flow path switching valve (control valve) 22 is arranged in the cutting oxygen introduction path 11 to the rotor chamber 6, and Oxygen outlet path 1 for cutting from 6
A kicker (starting aid) 23 is disposed at the starting end of the rotor 3 to provide rotational starting inertia to the rotor 7.

The downstream side (rotor chamber side) of the flow path switching valve 22 of the cutting oxygen introduction path 11 is formed by a main flow path 24 and a sub flow path 25 located above and below. A valve element 22m for controlling the main flow path and a valve element 22s for controlling the sub flow path are formed corresponding to each flow path 24, 25. In addition, each flow path 2
4 and 25 are normal rotation driving channels 24f and 25, respectively, which are oriented in the tangential direction on the outer circumferential surface 26 of the rotor 7.
f and reverse drive flow paths 24b and 25b.

As shown in FIG. 6, the rotor 7 housed in the rotor chamber 6 has an outer peripheral surface 26 formed in a stepped shape.
Oval airflow holes 29 are recessed in each of the main cutting oxygen flow receiving circumferential surface 27 consisting of the outer circumferential surface of the large diameter portion and the sub-cutting oxygen flow receiving circumferential surface 28 consisting of the outer circumferential surface of the small diameter portion. Each of the wind blowing holes 29 has a long axis in the rotor circumferential direction, and the bottom wall 30 of the wind blowing hole 29 has a protruding central portion in the longitudinal direction (rotor circumferential direction) and a ridge having an inclined surface in the rotor circumferential direction. It is formed into a shape,
The protruding end portion 31 is located inside the ventilation hole 29. Then, the main cutting oxygen flow wind blowing circumferential surface 27
The wind blowing hole 29m formed in the sub-cutting oxygen flow wind blowing circumferential surface 28 and the wind blowing hole 29s formed in the sub-cutting oxygen flow wind blowing circumferential surface 28 are formed so as to be shifted by half a pitch.

The kicker 23 has a leaf spring 33 fixed to a rotating shaft 32 rotatably supported by the casing 5, and a rotating knob 34 formed at the upper end of the rotating shaft 32.
By rotating the leaf spring 33, the side end portion of the leaf spring 33 comes into contact with the outer circumferential surface of the rotor 7, and the elastic force at that time creates a structure in which starting inertia force can be applied to the rotor 7 in the forward or reverse rotation direction. ing.

Figure 8 shows the state of the flow path during cutting work.
Fig. 8A shows the cutting of a thin material, and Fig. 8B shows the cutting of a thick material. When cutting a thin material by operating the flow path switching valve 22 in one step, the main flow path 24 is opened and the sub flow path 25 is held in a blocked state, and cutting oxygen is blown into the rotor chamber 6 only from the main flow path 24. Rotate the rotor 7. In addition, the flow path switching valve 2
When cutting thick material by operating 2 in two stages, both the main flow path 24 and the sub flow path 25 are in an open state,
Cutting oxygen is ejected from both channels 24 and 25 into the rotor chamber 6, causing the rotor 7 to rotate.

In the figure, 35m is an outlet of the main oxygen chamber for cutting which opens into the inner circumferential surface 36 of the rotor chamber 6, 35s is an outlet of the sub-cutting oxygen chamber which also opens into the inner circumferential surface 36 of the rotor chamber 6, and 37 is an outlet of the main body frame 3. The preheating oxygen and fuel gas are supplied from this connecting fitting 37 to the cutting nozzle 4 through a hose (not shown).

In the above embodiment, the rotor 7 is rotated around the vertical axis, but it may be formed to rotate around the horizontal axis. In addition, a wind blowing hole 29 is formed on the wind blowing circumferential surface formed on the rotor outer circumferential surface 26.
may be recessed in multiple stages.

As described above, the present invention is an automatic gas cutting machine in which the oxygen flow for cutting is used to drive the cutting machine itself, in which the rotor and drive wheels are connected via a speed regulating mechanism and a deceleration mechanism. , a plurality of wind receiving peripheral surfaces are provided on the outer circumferential surface of the rotor that are offset in the axial direction, and wind receiving holes are recessed in each wind receiving peripheral surface at appropriate intervals in the circumferential direction,
Each airflow hole is formed into an oval shape with a long axis extending in the circumferential direction of the rotor, and the bottom wall of each airflow hole is formed into a chevron shape with an inclined surface in the circumferential direction, and the top of the chevron shape is located within the windflow hole. , the wind blowing holes on adjacent wind blowing surfaces are shifted by half a pitch from each other, and cut oxygen inlets are arranged on the inner circumferential surface of the rotor chamber in correspondence with each wind blowing circumferential surface, and each cut oxygen inlet The control valves that control the oxygen supply to the rotor chamber are configured to be able to be operated in conjunction with each other, so even if cutting oxygen is blown into the rotor chamber from both cutting oxygen jets to increase the flow rate of cutting oxygen, the air blowing holes will not be aligned with the axis. Since the shapes formed on the wind blowing surfaces that are adjacent to each other in the direction are shifted by half a pitch,
Cutting oxygen is not cut off between the outer peripheral surface of the rotor and the inner peripheral surface of the rotor, and the cutting oxygen supplied to the cutting nozzle does not pulsate. As a result, in the present invention, even when cutting thick materials, oxygen for cutting can be supplied evenly, and cutting accuracy can be improved.

In addition, the outer peripheral surface of the rotor is formed with multiple stages of wind-blow-off surrounding surfaces, and the number of stages in use of the wind-blow-off surrounding surfaces can be changed by switching the control valve, making it possible to cut thin materials with a small amount of supplied oxygen. In some cases, the main cutting oxygen outlet can be used to eject the oxygen in a concentrated manner, allowing the rotor to rotate efficiently even with a small amount of cutting oxygen.In addition, a rotation starting aid is placed on the outside of the rotor circumference. Therefore, by operating this rotational starting aid, rotational starting inertia can be imparted to the rotor to further improve starting performance.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall perspective view, FIG. 2 is a sectional view taken along the line -- in FIG. 1, FIG. 3 is a sectional view taken along the line -- in FIG. Figure 5 is a cross-sectional view taken along the line - in Figure 4, Figure 6 is a perspective view taken out of the rotor, Figure 7 is a cross-sectional view taken along the line - in Figure 6, and Figure 8 A is a thin section cut. Fig. 8B is a sectional view of the main part showing the valve opening and closing state when cutting thick material. 1... Drive wheel, 3... Body frame, 4...
...cutting vent, 6... rotor chamber, 7... rotor,
22... Control valve, 23... Rotation starting aid, 26
...Outer peripheral surface of 7, 27, 28...Blowing peripheral surface, 2
9, 29m, 29s...Blowing hole, 30...Bottom wall of 29, 31...30 chevron-shaped protruding end, 35m...
Main cutting oxygen mound outlet, 35s...Sub-cutting gas mound outlet, 36...inner peripheral surface of 6, M...deceleration mechanism, G...speed governor.

Claims (1)

[Scope of utility model registration request] The main body frame 3 equipped with the drive wheel 1 supports the cutting nozzle 4, and the drive wheel 1 is interlocked and connected to the rotor 7 via the deceleration mechanism M, and the rotor chamber 6
In an automatic gas cutting machine, a speed governor G is interposed between the rotor 7 and the deceleration mechanism M, and the rotor 7 is driven by the cutting oxygen. A plurality of wind receiving peripheral surfaces 27, 28 are provided on the outer peripheral surface 26 of No. 7, which are offset in the axial direction, and wind receiving holes 29m, 29s are recessed in each wind receiving peripheral surface 27, 28 at appropriate intervals in the circumferential direction. 29m, 29
s is formed into an oval shape having a long axis in the circumferential direction of the rotor, and the bottom wall 3 of each ventilation hole 29m, 29s
0 is formed into a chevron shape having an inclined surface in the circumferential direction, and the chevron-shaped protruding end portion 31 of the wind blowing hole bottom wall 30 is located within each wind blowing hole 29m, 29s, and each of the wind blowing peripheral surfaces 27, 28 adjacent to each other is The wind blowing holes 29m and 29s are shifted by half a pitch, and the rotor chamber 6
A main cutting oxygen outlet 35m and a sub-cutting oxygen outlet 35s are installed on the inner circumferential surface 36 of each wind receiving circumferential surface 2.
7 and 28, and controls the oxygen supply to both cutting oxygen jet ports 35m and 35s.
2 so that they can be operated in conjunction with each other, and a rotation starting aid 23 is provided on the outside of the circumferential surface of the rotor 7.