CN2204076Y

CN2204076Y - Magnetic induction proximity switch

Info

Publication number: CN2204076Y
Application number: CN 94202716
Authority: CN
Inventors: 阎晓强; 郑炜
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-07
Filing date: 1994-02-07
Publication date: 1995-07-26
Anticipated expiration: 2004-02-07

Abstract

The utility model relates to a magnetic induction proximity switch, which belongs to an electrical switch class. A triggering unit with a self-preservation function for connection and disconnection is formed by a dry reed pipe and small magnetic steel which is stuck on the dry reed pipe to control the conduction and the cutoff of bidirectional controlled silicon, and the connection and the disconnection of the switch are realized. The utility model has the advantages that the controlling power is high; the operating distance is big; a self-preservation function for frequent opening and frequent closing is provided; the structure is simple; the cost is low; the operation is stable and reliable; the service life is long. The utility model can be used for an automatic control system to carry out the automatic detection, the positioning, the protection, etc.

Description

Magnetic induction proximity switch

The utility model relates to a kind of magnetic induction near switch, belongs to the electric switch class.Be applied in the automatic control system, detect automatically, locate, protection etc.

Claiming contactless electronic beam switch again near switch, is a kind of when detected object is close to certain distance, need not contact the novel automation device that just sends actuating signal.Because advantages such as it has do not have the machinery wearing and tearing, the response time is fast, frequency of operation is high, reliable in action, precision height, life-span are long, so be widely used in detecting automatically in the various automatic control systems, counting, automatic gauge, location, automatic streamline operation etc. automatically automatically.At present, application has near switchtype:

1. higher-order of oscillation formula is near switch, is that the variation failure of oscillations according to oscillator coil impedance in the high frequency oscillation circuit detects.Its shortcoming is: operating distance little (＜50mm), poor work stability, be subject to temperature and voltage influence, need independent power supply power supply.

2. the differential coil formula is according to producing little electric current flux in the object, utilizing the flux difference of magnetic test coil and comparator coil to detect near switch.Its shortcoming is: shape is big, price is more expensive, low-response, need independent power supply power supply.

3. capacitive approach switch is that variation according to static capacity shakes the oscillation circuit starting and stopping to detect.Its shortcoming is: operating distance little (＜25mm), need independent power supply power supply.

4. magneto-electric is to utilize the attraction of magnet to come the driving spring contact switch near switch.Its shortcoming is: operating distance little (＜15mm), no self protective function.

The purpose of this utility model be for provide in the automatic control system a kind of capacity height, operating distance big, have self protective function, working stability is reliable, simple in structure, cost is low, do not need independent power supply power supply, can directly be connected with forceful electric power near switch.Be suitable for directly being substituted with under the abominable operational environment contact, easy to wear, travel switch that the life-span is short, position switch, sense switch etc.

The purpose of this utility model is achieved in that and is sticking with glue two cylindrical little magnet steel on the tongue tube, formed and made the tongue tube contact just want closed critical magnetic field, magnet steel on being installed in detected object is during near tongue tube, the resultant magnetic field that acts on the tongue tube surpasses the critical value that makes the tongue tube junction closure, its junction closure triggers the control utmost point, bidirectional triode thyristor " conducting ", magnetic induction is near switch " connection ", after removing magnet steel, the tongue tube contact still is kept closed and does not disconnect (having self protective function).And return when the tongue tube according to original route when magnet steel, the tongue tube contact just disconnects, the control utmost point loses trigger impulse, bidirectional triode thyristor " end ", magnetic induction is near switch " disconnection ", externally present one be with self protective function near switch.

Owing to utilized such scheme, improved capacity, increased operating distance, had self protective function, simple in structure, cost is low.

Below in conjunction with accompanying drawing and example the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is a tongue tube course of action sketch among the utility model embodiment.

Fig. 3 is the structure chart of the utility model embodiment.

Little magnet steel 5. electronic circuit boards 6. lead terminals 7. indicator lights 8. magnet steel 9. radomes 10. cushion blocks 11. divider resistances 12. divider resistances 13. capacitance-resistances of 1. heat radiation aluminum hulls 2. bidirectional triode thyristors, 3. tongue tubes 4. absorb the external relay of electric capacity 14. capacitance-resistance absorption resistances 15. current-limiting resistances 16. etc. among the figure

In Fig. 1, the control utmost point of bidirectional triode thyristor 2 and tongue tube 3 one ends join, divider resistance 11 and 12 common wires and the tongue tube other end join, two cylindrical magnet steel 4 are bonded on the tongue tube, formed and made its contact just want closed critical magnetic field, magnet steel on being installed in detected object near tongue tube distance less than 120mm(operating distance) time, the resultant magnetic field that acts on the tongue tube surpasses the critical value that makes the tongue tube junction closure, its junction closure, for bidirectional triode thyristor provides trigger voltage, controllable silicon " conducting ", magnetic induction is near switch " connection ", indicator light 7 extinguishes, and other electric equipment work is controlled in external relay (or other electrical equipment) 16 energisings.When magnet steel moves on, the tongue tube contact still remains closed and does not disconnect (having self protective function).When magnet steel returned through tongue tube, the tongue tube contact just disconnected, and the control utmost point loses trigger impulse, and bidirectional triode thyristor " ends ", and magnetic induction is near switch " disconnection ", and indicator light 7 is luminous.External relay (or other electrical equipment) outage.Should in a cyclic process, finish the function of connection, self-insurance, disconnection near switch.

In Fig. 2, two tongue tubes 3 that will have self protective function are installed in parallel in together, make the contact of tongue tube A be in off-state at first, and the contact of tongue tube B is in closed self-insurance state.When magnet steel 8 during near tongue tube, the junction closure of tongue tube A and self-insurance, the contact of tongue tube B is opened.When magnet steel returns when the tongue tube, the contact of tongue tube A is opened, and a circulation has been finished in the junction closure of tongue tube B and self-insurance, externally present one often open, one normally closed and have a self protective function.

In Fig. 3, it is made of the fixed part and the moving component of epoxy resin perfusion.Fixed part is installed in compositions such as bidirectional triode thyristor 2 on the aluminum hull, tongue tube 3, little magnet steel 4, electronic circuit board 5, lead terminal 6, indicator light 7 by heat radiation aluminum hull 1.Moving component is made up of magnet steel 8, radome 9, cushion block 10 etc.

Claims

1, a kind of magnetic induction is made up of heat radiation aluminum hull 1, bidirectional triode thyristor 2, tongue tube 3, electronic circuit board 5, lead terminal 6, indicator light 7, magnet steel 8, radome 9 etc. near switch, it is characterized in that sticking with glue the special construction that two cylindrical little magnet steel 4 constitute on the tongue tube.

2, claims 1 described magnetic induction is near switch, it is characterized in that the control that tongue tube is installed in bidirectional triode thyristor extremely goes up.