JPS6232700Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention supports the detection rod in the middle so that it can rotate freely, the rod is urged to rotate in a fixed direction by an elastic means, and the rear end of the rod is A contact is provided around the rod, the tip of the rod is traced along the detection point, and the contact is opened and closed by the displacement of the rear end of the rod due to the rotation of the rod that follows the irregularities, bends, etc. of the detection point, and the contact is opened and closed by the contact opening/closing signal. This invention relates to an automatic tracing detector that detects irregularities, bends, etc. as deviations in a direction perpendicular to the axial direction of a rod.

[Conventional technology]

This type of automatic tracing detector A is used, for example, to guide a welding torch C in an automatic tracing welding machine B, as shown in FIG. There is a device described in the above publication, which will be explained with reference to FIGS. 1, 8, and 9. As shown in FIG. 1, the detection rod 1 is rotatably supported in the middle. As shown in FIG. 9, this rod 1 is made of a conductive member, and a contact portion 50 is provided at its rear end 1a.
A plurality of contact pins 51 are disposed so as to be in contact with the rod 1, and a spring 52 is provided on the rod 1 to bias and rotate it in a certain direction perpendicular to the axial direction of the rod 1. The contact part 50 is the contact pin 5
1 is not touched, as shown in Figure 8,
Point where tip 1b of rod 1 is detected (welding line a in the same figure)
When there are irregularities or bends in the detection point a, the tip 1b of the rod 1 follows the detected portion a.
The contact portion 50 and the contact pin 51 are brought into contact with each other by the swing (rotation) of the rear end 1a based on the swing, and the unevenness and bending of the detection point a are detected using the electrical contact signal.

[Problem that the invention attempts to solve]

By the way, when tracing a welding groove, there are openings, tack joints, etc. in the detection area, but when detector A traces that area, the rod shakes (rotates) a lot, and due to the shaking. Contact part 50 and contact pin 5
1 makes contact and a detection signal is emitted, but no judgment is made regarding the large shaking.
The torch C also moves based on the detection signal, and there is a problem that welding is performed again on the temporarily attached portion or welding is performed on the opening.

With the above points in mind, it is an object of the present invention to provide an automatic tracing detector that can generate a signal to indicate where work such as welding is unnecessary.

[Means for solving problems]

In order to achieve the above object, in the automatic tracing detector of this invention, the detection rod is rotatably supported in the middle, and the rod is urged to rotate in a fixed direction by an elastic means. However, a first detection contact is provided around the rear end of the rod, and the tip of the rod is traced along the detection location, and the displacement of the rear end of the rod due to the rotation of the rod that follows the unevenness, bending, etc. of the detection location causes the first detection contact to be detected. In an automatic scanning detector that opens and closes a detection contact and detects irregularities, bends, etc. as deviations in a direction perpendicular to the axial direction of the rod using the contact opening/closing signal, the first detection contact is located on a radiation line centered on the detection rod. A second detection contact, which opens and closes according to displacement of the rear end of the rod, is provided at a required distance from the first detection contact.

[Effect]

To perform tracing using a detector with this configuration,
As in the past, when the tip of the rod is traced along the detection location, if there are irregularities or bends in the detection location, the rod will sway and the rear end will be displaced.
Due to this displacement, the first detection contact opens and closes to emit a signal, and based on this signal, irregularities, bends, etc. at the detection location are detected. During this operation, if there is an opening, temporary attachment, etc. at the detection location and the rod swings (rotates) beyond the required interval, the second detection contact opens and closes and a signal is emitted to detect the opening, etc.

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

〔Example〕

As shown in FIGS. 1 and 2, the detection rod 1 protruding from the cylindrical body 5 consists of a lower rod piece 2a and an upper rod piece 2b.
are connected by. A bulging rotating part 4 is formed at the lower part of the upper rod piece 2b, and this rotating part 4
is inserted through a boss 6 fixed to the lower part of the cylindrical body 5 with a gap. A long hole 7 in the vertical direction passing through the left and right sides of the rotating part 4 is formed, and a branch piece 8 is inserted into this long hole 7 so as to be movable in the vertical direction but not rotatable. A shaft 9 which is rotatably inserted into the boss 6 is fitted into the boss 6, so that the upper rod 2b can rotate back and forth in FIG. 1 about the shaft 9. Further, a shaft 10 perpendicular to the shaft 9 passes through the support piece 8 and is rotatably supported by the rotating part 4, and the rotation of the upper rod 2b about the shafts 9 and 10 allows the rod 1 to be fully rotated. It can be tilted (rotated) in any direction.

A rotary ring 11 is rotatably fitted in the upper part of the cylinder 5, and press rods 13 are provided on the rotary ring 11 at a distance of 90 degrees, which protrude toward the center by a spring 12. is constantly biased in one direction perpendicular to its axial direction. Rotating wheel 11
A bolt 14 inserted through the cylindrical body 5 is screwed into the
By moving this bolt 14 into the slit 15, the rotary wheel 11 rotates within a range of 90 degrees, and the direction of inclination of the rod 1 changes within a range of 90 degrees.

A cylinder 17 having a contact part 16 is fitted into the upper part of the cylinder 5, and this contact part 16 has four fixed contact pieces 18.
a, 18b, 18c, 18d (generic code 18),
Four movable contact pieces 19a, 19b, 19c, 19d
(generic code 19) and four fixed contact pieces 20a, 2
0b, 20c, 20d (generic code 20),
The former fixed contact piece 18 and movable contact piece 19 form a normally closed contact, and the latter fixed contact piece 20 and movable contact piece 19 form a normally open contact. Their points of contact are equally spaced on the same circumference (four corners of a square)
As shown in FIGS. 1 and 3, when the rod 1 is on the cylinder axis of the cylinder 5 and the cylinder 17, the presser provided at the rear end 1a as shown by the chain line in FIG. 21 is located at the center of each normally closed contact and does not touch any of them, ie, is in a neutral state. In addition, since the urging force of the spring 12 is applied to the rod 1, the presser 21 always presses the movable contact piece 19d, and the contact piece 19d is separated from the contact piece 18d and is in contact with the contact piece 20d. . In the figure, 11' is the contact piece 20
This is an insulating ring that prevents contact between the cylinder body 5 and the cylinder body 5.

Each movable contact piece 19 is connected to a central socket terminal 23 via a bolt 22, and fixed terminals 18a, 1
8b, 18c, 18d are socket terminals 24a, 2
4b, 24c, 24d, fixed terminals 20c, 20
d are connected to socket terminals 25c and 25d, respectively. Note that the fixed terminals 20a and 20b are not connected to either in this embodiment.

A connector 27 is fitted into the socket 26, and a lead connector to a controller (not shown) is connected to the connector 27.

The contact interval between the movable contact piece 19 and the fixed contact piece 20 is such that the two do not come into contact with each other due to irregularities and bends in normal tracing of the detection location.

The embodiment is configured as described above, and its operation will be explained next.

For example, as shown in FIG. 8, when used in an automatic copy welding machine B, the detector A is supported on the welding machine B by appropriate hand-holding means so as to be positioned in front of the path of the welding torch C. . At this time, the contact piece 18
Support so that d, 19d, and 20d are on the upper side,
The rod 1 makes an angle θ with respect to the welding line a in the advancing direction (to the left in the figure). Tilt angle θ is 30 degrees ~
Preferably around 45 degrees.

In this state, as shown in FIG. 6, the detector A is connected to a controller 28 via a connector 27, etc., and the controller 28 controls a motor 29 that moves the welding machine B up and down, and a motor 30 that moves it left and right. Driven.

Furthermore, by supporting the detector A so that the contact pieces 18d, 19d, and 20d mentioned above are on the upper side,
A contact 31 consisting of contact pieces 18d and 19d is for downward detection, a contact 32 consisting of contact pieces 18c and 19c is for upward detection, and a contact 3 consisting of contact pieces 18b and 19b.
3 is for detecting the right direction, a contact 34 consisting of contact pieces 18a and 19a is for detecting the left direction, a contact 35 consisting of contact pieces 19d and 20d is for detecting excessive downward movement, and a contact consisting of contact pieces 19c and 20c. 36 is for detecting movement in the upward direction more than necessary.

When tracing the V-shaped welding groove a shown in FIG. 7 with the detector A supported in this way, the bolt 14
is positioned at the center of the slit 15, and the pressing rod 13 is used to tilt the rod 1 in the direction in which the pressing member 21 presses only the contact piece 19d. At this time,
Although the contact 35 is closed, the prior copy of this closing signal is ignored.

In this state, when the controller 28 reversely rotates the motor 29 to move the detector A downward, the rod tip 1b hits the welding groove a and a load is applied, causing the rod 1 to rotate. Then, the pressure of the pusher 21 is released, the contact pieces 19d and 18d come into contact and the contact 31 is closed, the drive of the motor 29 is stopped, and the pusher 21 is moved to the fixed contact pieces 18a, 18b, 1.
A neutral state is reached in which all of 8c and 18d are not pressed. In this state, the position of the detector A to follow the welding groove a is completed.

When this tracing position is completed, a welding traveling drive motor (not shown) is started to move the detector A and the welding torch C in the direction of tracing the welding groove a (to the left in Fig. 8), and the welding travel drive motor (not shown) is started, continuously or Drive intermittently,
Welding torch C follows the movement of detector A and performs welding work. During this action, for example, if the welding groove a is raised in the shape of a mountain, the rod tip 1b follows the raised part, so that the rear end 1a of the rod 1, that is, the presser 21 is moved downward. The movable contact piece 19c is rotated to press the movable contact piece 19c, and the contact piece 19c separates from the fixed contact piece 18c, opening the contact point 32. When this open signal from the contact 32 is input to the controller 28, the motor 29 is rotated in the forward direction, and the drive causes the detector A to move upward until the presser 21 is in the neutral state. On the contrary, when the welding groove a is recessed in the shape of a valley, the rod tip 1b follows it, causing the presser 21 to rotate upward and press the movable contact piece 19d. The contact piece 19d is the fixed contact piece 18d.
The contact point 31 opens away from the point. When the open signal of this contact 31 is input to the controller 28, the motor 29 is reversely rotated, and the detector A is driven by the pusher 2.
1 moves downward until it is in a neutral state.

Furthermore, when the welding groove a is curved to the left, the rod tip 1b follows it, causing the pusher 21 to rotate to the right and press the movable contact piece 19a, so that the contact piece 19a The contact 34 opens away from the fixed contact piece 18a. When this open signal from the contact point 34 is input to the controller 28, the motor 30 is rotated in the reverse direction, and the drive causes the detector A to move to the left until the pusher 21 is in the neutral state. On the contrary, when the welding groove a is curved to the right, the rod tip 1b follows it, causing the presser 21 to rotate to the left and press the movable contact piece 19b. Contact piece 1
9b separates from the fixed contact piece 18b, and the contact 33 opens. When this open signal from the contact 33 is input to the controller 28, the motor 30 is rotated in the forward direction, and the drive causes the detector A to move to the right until the presser 21 is in the neutral state.

Further, when the welding groove a is raised in a mountain shape and curved to the left, the rod tip 1b follows it and the presser 21 is rotated downward and to the right, and the movable contact piece 19c and 19a are pressed, contact pieces 19c and 19a separate from fixed contact pieces 18c and 18a, and contacts 32 and 34 open. When the open signals of the contacts 32 and 34 are input to the controller 28, the motor 29 is rotated in the forward direction and the motor 30 is rotated in the reverse direction. Move and move to the left. Similarly, if the welding groove a is depressed in the shape of a valley and curved to the right, if the welding groove a is raised in the shape of a mountain and curved to the right, if the welding groove a is depressed in the shape of a valley and curved to the left, Detector A is also moved by the rod 1b following the movement. In this way, the detector A follows the welding groove, and the welding torch C follows the movement of the detector A to perform welding.

Next, during this operation, if the welding groove a is tacked and there is a large protuberance, the rod tip 1b will follow the protrusion, causing the presser 21 to be rotated significantly downward. Movable contact piece 1
9c contacts the fixed contact piece 20c, and the contact 36 is closed. When this closing signal is input to the controller 28, a temporary attachment portion is detected and corresponding measures are taken, such as stopping or weakening the action of the welding torch C.

In addition, if a hole is formed in the welding groove a, or if the workpiece to be welded is a plate or the like and the end of the groove disappears, the rod tip 1b follows the groove and moves downward significantly, causing the presser 21 to move upward. The movable contact piece 19d contacts the fixed contact piece 20d and the contact point 35 is closed. When this close signal is input to the controller 28, the corresponding part is marked as not requiring welding.
For example, the action of welding torch C may be stopped.

In the embodiment described above, the contacts 31, 32, 33, and 34 are provided in four directions around the presser 21, making it possible to detect displacement in two directions: vertically and horizontally. That is, contact points were provided at equal distances in opposite directions from the center line on the center line perpendicular to the rod's 1-axis direction (for example, 31
It goes without saying that this invention can be applied to structures having the following structures: and 32 or 33 and 34).

Also, in the device described in the above-mentioned Japanese Utility Model Publication No. 55-9502, the contact pin 51 is made of a bendable contact piece, and a fixed contact piece is provided at a required interval on the outside of the contact pin 51, and both contact pieces are used as the second contact piece. If you configure the detection contact,
The structure of this idea is adopted and its effects can be obtained.

[Effect of idea]

This invention is configured as described above, and the second detection contact also detects large swings of the rod, so when guiding the welding torch in an automatic copy welding machine, the detection location can be opened, tacked, etc. If the welding action has to be different from the normal one, it is possible to detect this point and take appropriate action, such as stopping the welding.

[Brief explanation of the drawing]

Figure 1 is a sectional view of one embodiment of the automatic scanning detector of this invention, Figure 2 is an exploded perspective view of Figure 1, and Figures 3 and 4 are sectional views taken along the line X--X of Figure 1. Figure 3 is a neutral state, Figure 4 is a state diagram of one operation, Figure 5 is a sectional view taken along the Y-Y line in Figure 1, Figure 6 is a circuit diagram of the embodiment, and Figure 7 is a copying operation. 8 is a front view for explaining the operation of the embodiment, and FIG. 9 is a sectional view of a main part of a conventional automatic scanning detector. 1...Detection rod, 1a...Rod rear end, 1b
... Rod tip, 5 ... Cylindrical body, 12 ... Spring, 1
8a, 18b, 18c, 18d...Fixed contact piece, 1
9a, 19b, 19c, 19d...movable contact piece, 2
0c, 20d...Fixed contact piece, 21...Press element.

Claims (1)

[Claims for Utility Model Registration] (1) A detection rod is inserted onto the cylinder shaft inside the cylinder, and the rod is rotatably supported in the middle of the rod, and the rod is fixed at a certain level by an elastic means provided on the cylinder. First detection contacts are provided between the cylindrical body and the rear end of the rod at equal distances in opposite directions from the center line on the center line perpendicular to the rod axis direction. It opens and closes when the rear end approaches, and the first detection is performed by making the tip of the rod trace along the detection location, and by displacing the rear end of the rod by rotating the rod to follow the irregularities, bends, etc. of the detection location. In an automatic scanning detector that opens and closes a contact and uses the contact opening/closing signal to detect irregularities, bends, etc. as deviations in a direction perpendicular to the axial direction of the rod, the first detection contact is An automatic tracing detector characterized in that a second detection contact, which opens and closes according to displacement of the rear end of the rod, is provided on the outer cylindrical body with a required spacing from the first detection contact. (2) A contact portion is provided at the rear end of the detection rod, and a movable contact piece is provided on the cylindrical body around the contact portion, the contact portion and the movable contact piece constitute the first detection contact, and the movable contact piece A fixed contact piece is provided on the cylindrical body so as to be in the moving direction, and both contact pieces are used to move the second
The automatic copying detector according to claim (1) of the utility model registration, characterized in that it comprises a detection contact. (3) a pusher is provided at the rear end of the detection rod, and a normally closed contact consisting of a fixed contact piece and a movable contact piece is provided in a cylindrical body around the pusher to constitute the first detection contact; This contact is arranged so that the movable contact piece is bent by the rotation of the detection rod so that the contact piece separates from the fixed contact piece, and in the bending direction of the movable contact piece, the movable contact piece is bent and comes into contact with it. The automatic scanning detector according to claim (1), which is a registered utility model, characterized in that a fixed contact piece is provided on the cylindrical body, and the second detection contact is constituted by both of the fixed contact pieces.