JPH0421112Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic line detection sensor suitable for detecting welding positions in a self-propelled welding line inspection device.

[Conventional technology]

Since the weld metal of non-magnetic SUS304 steel becomes magnetic due to heat, a magnetic line detection sensor has been proposed as a weld line sensor for an inspection device that is self-propelled along the weld line, and the conventional magnetic line detection sensor For example, as shown in the cross-sectional view of FIG. 3, the base material 10
A sensor body 12 is mounted on a self-propelled cart (not shown) that runs along a magnetic part 11 made of welded metal.
A magnet 15 is fixed to each tip of a pair of leaf spring levers 14 supported by a fulcrum 13 inside the magnet 15, and when the magnet 15 approaches the magnetic part 11, the magnet 15 moves closer to the magnetic part 11 in proportion to that.
As a result, the lever 14 is bent. At this time, the strain gauge 16 attached to the lever 14,
17 detects the amount of deflection, and the position of the self-propelled cart with respect to the magnetic section 11 is determined, and as a result, the self-propelled cart can automatically travel along the magnetic section 11.

However, since such a sensor has a structure in which a magnet is fixed to the end of a pair of levers supported on a fulcrum, it can only be applied to a horizontal plane perpendicular to the direction of gravity, and furthermore, the distance to the target surface must always be kept constant. Therefore, even if there is a slight unevenness, the strain gauge output changes and the magnetic part cannot necessarily be tracked sufficiently.

[Problem that the invention attempts to solve]

The present invention was proposed in view of these circumstances, and allows the sensor to detect magnetic lines in any position, and also to reliably detect magnetic lines even if the distance to the surface to be detected containing the magnetic lines changes. It is an object of the present invention to provide a magnetic ray detection sensor that can be applied to uneven surfaces or inclined surfaces.

[Means for solving problems]

To this end, the present invention consists of a magnet movably mounted on a non-magnetic guide rod, and a pair of pulleys with the same magnet attached to one of the parallel intermediate portions and whose ends are located at both ends of the guide rod. a counterweight having a weight equal to the weight of the magnet attached to the other intermediate portion of the wire at a position opposite to the magnet, and means for detecting the amount of relative movement between the magnet and the guide rod. It is characterized by having the following.

[Effect]

With the above configuration, the sensor can detect magnetic lines in any posture, and can also reliably detect magnetic lines even if the distance to the surface to be detected containing the magnetic lines changes, making it applicable to uneven or inclined surfaces. A magnetic line detection sensor can be obtained.

〔Example〕

An embodiment in which the present invention is applied to a welding line inspection device will be explained with reference to the drawings. Fig. 1 is a front view thereof;
FIG. 2 is a plan view thereof.

In the above figure, the magnetic wire sensor 1 consists of pulleys 3a and 3b respectively arranged on a pair of support stands 2a and 2b arranged at an appropriate distance apart, and both support stands 2.
A guide rod 4 made of a non-magnetic material and a guide rod 5 of any magnetic nature passed between a and 2b, and the same guide rods 4, 5.
A magnet 6 and a balancer 7 having the same weight as the magnet 6 are movably mounted on the magnet 6, respectively, and an endless wire 8 is connected to the magnet 6 and the balancer 7 in the middle part and is passed around the pulleys 3a and 3b. , and a sensor 9 connected to the pulley 3b to detect the amount of rotation.

The operation when such a magnetic wire sensor 1 is mounted on a self-propelled cart (not shown) and made to run along the magnetic part 11 on the non-magnetic base material 10 will be explained.

In FIG. 1, if the self-propelled cart shifts to the right, only the magnet 6 is held on the magnetic part 11 by the attraction force, and the guide rod 4 and the entire magnetic sensor 1 are automatically held against this magnetic part 11. It moves to the right along with the trolley.

As a result, the pulley 3b rotates in the direction of the arrow CW, and the sensor 9 can detect the amount of rotation. Therefore, if the self-propelled cart moves so that the amount of rotation becomes zero, it can always travel along the magnetic section 11. The same thing happens when the self-propelled cart shifts to the left.

Furthermore, even if the non-magnetic base material 10 is a vertical surface or a suitable inclined surface, a balancer 7 having the same weight as the magnet 6 is movably disposed on the opposite side of the pulley 3b via a wire 8 using a guide rod 5 as a guide. Since the magnet 6 is placed in a horizontal position, the influence of gravity on the magnet 6 can be eliminated, and the magnet 6 operates in the same way as when it is placed horizontally.

The sensor 9 may be of any type as long as it can detect the amount of relative movement between the magnet 6 and the guide 4. Further, instead of the balancer 7, a torque motor, a spring, etc. that can provide a constant tension may be used.

Although the above embodiment is for detecting welding lines, the sensor of the present invention can also be applied to a traveling trolley or the like that runs along a magnetic metal tape attached to a concrete floor in an automated warehouse.

According to such a device, the magnet 6 can always be held at the shortest position to the magnetic part 11 on the guide rod 4, so even if the distance between the magnetic part 11 and the magnetic wire sensor 1 changes, the magnetic part 11 can be reliably held. can be detected, so it can be applied not only to smooth surfaces but also to uneven surfaces.

Furthermore, since the balancer 7, which has the same weight as the magnet 6, can eliminate the influence of gravity, it can be applied not only to horizontal surfaces but also to vertical and inclined surfaces.

[Effect of idea]

In short, according to the present invention, a magnet is movably mounted on a non-magnetic guide rod, and the magnet is attached to one of the parallel intermediate portions, and the magnet is rotated around a pair of pulleys whose ends are located at both ends of the guide rod. Detecting the amount of relative movement between the twisted endless wire, a counterweight having a weight equal to the weight of the magnet attached to the other intermediate part of the wire and facing the magnet, and the magnet and the guide rod. The sensor can detect magnetic lines in any posture, and can reliably detect magnetic lines even if the distance to the surface to be detected containing the magnetic lines changes. The present invention is industrially extremely useful because it provides a magnetic ray detection sensor that can be applied to other applications.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the magnetic line detection sensor of the present invention, and FIG. 2 is a plan view thereof. Third
The figure is a cross-sectional view showing a conventional device. 1... Magnetic wire sensor, 2a, 2b... Support stand, 3a, 3b... Pulley, 4... Non-magnetic guide bar, 5... Guide bar, 6... Magnet, 7...
Balancer, 8...Wire, 9...Sensor, 1
0...Welding base material, 11...Magnetic part.

Claims (1)

[Scope of utility model registration request] a magnet movably mounted on a non-magnetic guide rod; an endless wire with the magnet attached to one of the parallel intermediate portions and wound around a pair of pulleys with both ends located at both ends of the guide rod; A counterweight having a weight equal to the weight of the magnet is attached to the other intermediate portion of the wire at a position facing the magnet, and a means for detecting the amount of relative movement between the magnet and the guide rod. Features a magnetic line detection sensor.