JPH088513Y2 - Circuit breaker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention operates by shutting off the power supply when an industrial robot, machine tool, etc. malfunctions or collides with other obstacles. The present invention relates to a circuit breaker for stopping and preventing accidents and damage to machinery.

[Conventional technology]

In recent years, unmanned industrial robots are often used in factories, but when this industrial robot malfunctions or collides with other obstacles, the machine is damaged or unmanned. There was a danger of causing a big accident. Further, even in general machine tools and the like, there is a possibility that an accident may occur due to an operation error or a failure. Therefore, these industrial robots, machine tools, etc. are equipped with a circuit breaker that stops the operation in order to prevent an accident in the case of a malfunction.

For example, as shown in FIG. 6, in an industrial robot, a dog D is provided on a moving member B ₁ that linearly reciprocates, and a limit switch L is provided on a fixed member B ₂ .
When the moving member B ₁ moves beyond the original moving range, the dog D connects the limit switch L. When the limit switch L is connected, the operation of the industrial robot main body is stopped by the dedicated wiring. Also, instead of the limit switch L, there has been one using a photo switch that optically detects an abnormal movement of the moving member B ₁ .

[Problems of conventional technology]

However, in such a conventional circuit breaker, since the sensing portion for sensing the abnormal movement of the moving member has a relatively complicated structure and is exposed to the outside, long-term use, moisture, gas, It was apt to fail due to a bad environment such as dust, and it was not reliable as an electric circuit breaker that operates reliably in an emergency and prevents accidents. Further, the structure is complicated and a dedicated wiring is required, so that the cost is high.

[Means for solving problems]

In view of the above, the present invention provides an electric circuit breaker, which is provided with a conductive pattern on a ceramic body and interrupts energization when the ceramic body is broken.

〔Example〕

An embodiment according to the present invention will be described below with reference to the drawings. 1 (a) and 1 (b), a circuit breaker 1 comprises rectangular parallelepiped ceramic bodies 2 and 3, and grooves 2a and 3a are formed in the ceramic bodies 2 and 3, respectively. Also,
The ceramic body 3 is provided with a U-shaped conductive pattern 4, and an end 4a of the conductive pattern 4 is exposed to the outside. In the method of manufacturing the electric circuit breaker 1, the unfired ceramic bodies 2 and 3 are first prepared, and a conductive paste such as molybdenum-manganese, tungsten, silver palladium, or an active metal is printed on the ceramic body 3. The conductive pattern 4 is formed, and the ceramic body 2 is formed so as to cover the conductive pattern 4.
3 may be laminated and fired integrally. Moreover, the ceramic body 2 can be used as the electric circuit breaker 1 by firing the exposed conductive pattern 4 without laminating them.

Next, as an example, as shown in FIG. 2, the cylindrical electric circuit breaker 10 includes two semi-cylindrical ceramic bodies 20, 30.
Are laminated and integrally fired, and the conductive pattern 4 is provided inside, and the end portion 4a of the conductive pattern 4 is exposed to the outside. Moreover, so that the impact from any direction is also easy to break participating for forming the grooves 20a, 30a around the entire periphery.

The electric circuit breaker 11 shown in FIG. 3 has a conductive pattern 40 on the surface of a spring-shaped ceramic body 21. The electric circuit breaker 11 withstands a light force but breaks when a force of a certain amount or more is applied, and can be used as a stress sensor.

Further, the electric circuit breaker 12 shown in FIG. 4 is provided with a conductive pattern 41 on the surface of an annular ceramic body 22. If the dog D provided on the moving member is placed inside the safety device 12, the dog D can collide with the circuit breaker 12 and be broken.

Further, although not shown, if the electric circuit breaker is made into an extremely thin rod shape, the same effect can be obtained without the need to form a groove.

Next, an example of use of the electric circuit breaker 1 shown in FIGS. 1A and 1B will be described. FIG. 5 (a) is a part of an industrial robot in which a moving member B ₁ that linearly reciprocates is provided with a dog D, a fixed member B ₂ is provided with a socket S, and the socket S has an electric circuit. The breaking device 1 is inserted. This electric circuit breaker 1 is connected to the main power source of the robot body in series by brazing an electrode rod or an electrode wire to the end 4a of the conductive pattern 4 which is sprayed to the outside. Is flowing. When the moving member B ₁ is operating correctly, the dodd D and the safety device 1 do not come into contact with each other, but the moving member B ₁ malfunctions or is otherwise caused.
When the dog D has largely moved to the right in the drawing, the dog D collides with the electric circuit breaker 1, and the electric circuit breaker 1 is broken from the groove portion, and at the same time, the conductive pattern 4 inside is also broken. The operation can be stopped by cutting off the main power of the robot body.

Further, as shown in FIG. 5 (b) as a usage example of the cylindrical electric circuit breaker 10, the electric circuit breaker 10 is provided on the arm portion of the moving member B ₁ that repeats the reciprocating motion in the rotational direction. If the moving member B ₁ malfunctions or other members move close to each other, and the electric circuit breaker 10 of the arm collides with an obstacle, the electric circuit breaker 10 breaks and the main power supply is turned on. It can be shut off to stop operation. Further, in any of the usage examples, after breaking the electric circuit breakers 1 and 10, the industrial robot can be moved in the same manner as before by replacing it with a new one.

Since the electric circuit breakers 1 and 10 are formed of a brittle material such as ceramics, they do not undergo plastic deformation when a strong force is applied, and reliably break from the groove. Since the conductive pattern 4 is printed on a ceramic body and integrally fired, the conductive pattern 4 can be reliably broken and the main power source can be cut off when the electric circuit breakers 1 and 10 are broken. In addition, since the electric circuit breakers 1 and 10 are made of ceramics and the conductive pattern 4 is not exposed to the outer surface, they have excellent electrical insulation and corrosion resistance, and can be used for a long period of time or under adverse conditions. There is no risk of failure even when used with and.

Next, the electric circuit breaker 1 shown in FIGS. 1 (a) and 1 (b) was prototyped. The material is alumina ceramics, and the conductive pattern 4 is formed by printing molybdenum-manganese paste. The overall size is 3 mm in length, 3 mm in width, and 20 mm in length, and the grooves 2a, 3 are formed.
The depth of a was set to 0.6 mm. When this electric circuit breaker 1 was used, it was confirmed that when a force of about 2 kg was applied, it broke and the power supply was stopped without fail. Circuit breaker 1
By changing the thickness of the groove and the depth of the grooves 2a, 3a, it can be formed so as to be ruptured by an appropriate amount of force.

Further, although alumina ceramics is used as the material of the circuit breaker 1 in the above embodiment, the same effect can be obtained by using zirconia, silicon carbide, silicon nitride or the like.

[Effect of device]

As described above, according to the present invention, the brittle material ceramic body is provided with the conductive pattern, and the circuit breaker is formed so as to cut off the electric current when the ceramic body is broken. It operates reliably with a simple structure, is inexpensive, and has excellent electrical insulation and corrosion resistance, so even if it is installed for a long time in adverse conditions, it will operate reliably in case of emergency. It is possible to provide a high circuit breaker.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) respectively show an electric circuit breaker according to the present invention. FIG. 1 (a) is a perspective view showing the overall shape, and FIG. It is an exploded perspective view. 2 and 3,
FIG. 4 is a perspective view showing another embodiment of the present invention, FIG. 5 (a) is a side view showing an example of use of the electric circuit interruption device according to the present invention, and FIG. 4 (b) is an electric circuit according to the present invention. It is a perspective view which shows the other usage example of a blocking device. FIG. 6 is a side view showing an example of use of a conventional electric circuit breaker. 1,10,11,12 …… Circuit breaker 2,3,20,30,21,22 …… Ceramic body 4,40,41 …… Conductive pattern

Claims (1)

[Scope of utility model registration request] 1. A pattern formed by a conductive paste is embedded in a ceramic body, and the internal conductive pattern is broken by breaking due to the application of an external force to the ceramic body so as to interrupt the electric circuit. Circuit breaker.