JPH06219Y2 - Gas cutting torch height detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a torch height detecting device of a type in which a capacitance detector detects a distance between a gas cutting torch and an object to be cut.

<< Prior Art >> Generally, an automatic gas cutting machine is provided with a device for detecting the height position of a torch. This type of torch height detection device is equipped with a capacitance type detector so that the distance between the crater and the object to be cut can be detected in a non-contact manner to improve cutting quality such as cutting accuracy. There are some (for example, Japanese Examined Patent Publication No. 19-19514 or Japanese Examined Patent Publication No. 53-11931).

Further, in the above automatic gas cutting machine, in order to prevent thermal distortion of the cut object during gas cutting, the cooling liquid spray nozzle for cooling the cut object may be supported by the torch by the support bracket. In this case, conventionally, the electrode of the electrostatic capacity type torch height detector and the cooling liquid spraying nozzle are provided as independent parts and individually supported by the torch.

<< Problems to be Solved by the Invention >> As described above, when an object cooling means is attached to an automatic gas cutting machine equipped with a capacitance type torch height detector,
Since the cooling liquid spray nozzle and the nozzle supporting bracket are required, there has been a problem that the number of parts increases and the configuration around the torch becomes complicated.

The present invention aims to solve this problem and simplify the configuration around the torch.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention provides a capacitive torch height detection on a torch 4 of a gas cutting machine 1 as shown in Figs. 1 to 4, for example. The electrode 7 of the container 6 is supported by the electrode holder 9, and the electrode 7 is formed in a hollow shape and is arranged so as to surround the crater 4a. The hollow portion of the hollow electrode 7 provides a flow path for the cooling liquid for the object to be cut. 13, and also has a cooling liquid outlet hole 15 and a cooling liquid inlet hole 17 formed in the peripheral wall 14 of the flow path 13.

<Operation> The present invention operates as follows.

The capacitance type torch height detector 6 detects the distance 1 between the hollow electrode 7 and the object W to be cut, compares the detected value with the target value, and establishes a fixed relationship with the torch height detector 6. By driving a certain torch 4, the height position of the crater 4a is adjusted to meet the cutting conditions.

The thermal strain of the workpiece W during gas cutting is large,
To prevent this, a cooling liquid such as cooling water is injected into the flow path 13 in the electrode 7 from the cooling liquid inlet hole 17. Then,
The cooling liquid flows evenly and smoothly in the flow path 13 and is sprayed from the cooling liquid outlet hole 15 toward the object W to be cut. As a result, the heated portion of the workpiece W is sufficiently cooled.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a plate-shaped object W placed on a support A can be processed by the gas cutting machine 1. The gas cutting machine 1 controls the torch support arm 3 to move horizontally with respect to the bed 2 via the drive control device N, and vertically controls the torch 4 with respect to the torch support arm 3. It is like this. In this elevating control, the electrostatic capacitance type torch height detector 6 detects the distance 1 between the hollow ring-shaped electrode 7 and the workpiece W, and drives the torch elevating motor (not shown). ing.

The capacitance type torch height detector 6 described above is used in FIGS.
This will be described with reference to FIGS. FIG. 1 is an enlarged view of a main part of FIG.
3 is a view taken along the line III-III in FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV in FIG.

The electrode 7 of the capacitance type torch height detector 6 is composed of a hollow metal ring and is arranged so as to surround the crater 4a substantially coaxially with the axis of the crater 4a. The ring-shaped electrode 7 is supported at a mid-height position of the torch 4 through a conductive rod member 8, an electrode holder 9 made of an insulating material, and an electrode holder fixture 10 in this order.

Further, in order to prevent thermal distortion of the fixed object W during gas cutting, the fixed object cooling means 12 is attached to the torch 4. That is, the hollow portion of the ring-shaped electrode 7 constitutes the flow path 13 for the cooling liquid for the fixed object. A cooling liquid outlet hole 15 is formed below the peripheral wall 14 of the flow path 13. The cooling liquid outlet hole 15 is formed by forming a large number of circular small holes 15a at predetermined intervals in the circumferential direction. On the other hand, a cooling liquid inlet hole 17 is formed on the upper side of the peripheral wall 14 of the flow path 13, and cooling water as a cooling liquid can be supplied to the cooling liquid inlet hole 17 via an inlet pipe 18 and a hose 19. To be done.

The electrode 7 does not necessarily have to be formed in a ring shape, and may be formed in a U shape or a T shape in a plan view. Also,
The cooling liquid outlet hole 15 may be formed with at least one groove-shaped one instead of providing a large number of circular small holes 15a.

<< Effects of the Invention >> The present invention has the following effects because it is configured and operates as described above.

When attaching a cooling device for the object to be cut to a gas cutting machine equipped with a capacitance torch height detector, the cooling electrode can be used as a cooling liquid spray nozzle with a hollow electrode, so the cooling liquid spray nozzle and nozzle support of the conventional structure can be supported. The bracket for can be omitted. Therefore,
The number of parts is small and the structure around the torch is simplified.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is an enlarged view of an essential part of FIG. 2, and FIG. 2 is an overall view of an automatic gas cutting machine,
3 is a view taken along the line III-III in FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. I ... Gas cutting machine, 4 ... Torch, 4a ... Tinder, 6 ... Capacitance type torch height detector, 7 ... Electrode, 9 ... Electrode holder,
Reference numeral 13 ... Coolant flow passage for cut object, 14 ... Peripheral wall of flow passage 13, 15 ... Coolant outlet hole, 17 ... Coolant inlet hole.

Claims (1)

[Scope of utility model registration request] 1. A torch (4) of a gas cutting machine (1) supports an electrode (7) of a capacitance type torch height detector (6) with an electrode holder (9), and the electrode (7) is hollow. The hollow electrode (7) is formed so as to surround the crater (4a), and the hollow portion of the hollow electrode (7) constitutes the flow path (13) for the cooling liquid for the object to be cut, and the flow path (13). A gas cutting torch height detection device, characterized in that a cooling liquid outlet hole (15) and a cooling liquid inlet hole (17) are formed in the peripheral wall (14) of the.