CN201639560U

CN201639560U - High-capacity high-voltage inductive proximity switch

Info

Publication number: CN201639560U
Application number: CN2010201004863U
Authority: CN
Inventors: 王深
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-01-25
Filing date: 2010-01-25
Publication date: 2010-11-17
Anticipated expiration: 2020-01-25

Abstract

The utility model discloses a high-capacity high-voltage inductive proximity switch, belonging to the field of automatic control. The high-capacity high-voltage inductive proximity switch consists of an oscillating circuit, a chip circuit and an output circuit. The proximity switch can detect that whether metal exists or not in a certain distance and can directly drive high-voltage contactors with high voltage of AC380V and current of AC2000mA and the like. In addition, the proximity switch can directly replace the travel switch which has contacts, is easy to wear and has short service life in a cart (trolley) control system of a crane and the like and has the advantages of no mechanical wear, no contact, high capacity and the like.

Description

A kind of big capacity high voltage inductance approach switch

Technical field

The utility model relates to a kind of inductance approach switch, particularly a kind of big capacity high voltage inductance approach switch.

Background technology

Industrial and mining enterprises' crane exchanges in the 380V contactor control system, uses travel switch (or claiming limit switch) that crane (or dolly) is carried out stroke (or claiming spacing) the position important switch of control automatically in a large number.When assigned address is arrived in crane (or dolly) traveling, under the effect of hitting chi mechanical force bump, make switch send cut-off signal, finish stroke (or spacing) safety protection function of crane (or dolly).Because mechanical force makes mechanism easy to wear and fracture to the bump of travel switch, and the contact in the switch bears the very high self-induced e.m.f of contactor and produces arc light and make its too early scaling loss when disconnecting, and causes the spare parts consumption amount of switch very big.Even, cause shut-down, stopping production, loss of life or personal injury and equipment major accident etc. because the travel switch action is malfunctioning.

In existing inductance approach switch, electric pressure generally is divided into two-stage: direct current DC10-30V with exchange AC110-220V; Current class generally is divided into: direct current DC50-200mA with exchange AC50-300mA.And the voltage of the A.C. contactor in goliath is generally AC380V, and the coil current of contactor is generally 1000-2000mA.Therefore, existing electric pressure and current class near switch all can not satisfy such requirement.

The utility model mainly solves voltage request height in the crane AC380V contactor control loop, current capacity requires big characteristics, and can directly replace travel switch easy to wear, that the life-span is short.

Summary of the invention

In order to solve the problem that the inductance approach switch electric pressure is low in the prior art, current capacity is little, the utility model proposes a kind of big capacity high voltage inductance approach switch, concrete technical scheme is:

A kind of big capacity high voltage inductance approach switch is characterized in that being made up of metal, oscillating circuit, chip circuit and output loop.

Above-mentioned big capacity high voltage inductance approach switch is characterized in that chip circuit is is the circuit of core with the 0161DB chip.

Above-mentioned big capacity high voltage inductance approach switch is characterized in that 3 of LC oscillator output end and chip input are connected with 7 pin, and chip 1 pin and 6 pin are electric current output and power supply.

Above-mentioned big capacity high voltage inductance approach switch is characterized in that piezo-resistance R7 in parallel between described output loop lead-in wire L1 and the L2, produces the self-induced e.m.f discharge when being used for contactor J outage.

The foregoing circuit electronic component is installed and is welded on the printed circuit board (PCB), is encapsulated in the tubular shell, and lead-in wire is drawn at the afterbody of shell.

Compared with prior art, characteristics of the present utility model are: by the rectifier bridge use of connecting with the contactor in the AC380V control system, be equivalent to a noncontacting switch, can directly replace existing travel switch.

Description of drawings

The utility model is described in more detail below in conjunction with accompanying drawing.

Fig. 1 is a three-dimensional structure diagram of the present utility model;

Fig. 2 is a principle assumption diagram of the present utility model;

Fig. 3 is circuit theory diagrams of the present utility model;

Fig. 4 is the utility model embodiment on crane.

Embodiment

As shown in Figure 1, the utility model by inductive head 1, threaded shell 2, a pair of locking nut 3, inner printed circuit board (PCB) 4, be welded in the electronic devices and components 5 on the printed circuit board (PCB) and go between and 6 form.

As shown in Figure 2, the utility model is made of oscillating circuit, chip circuit and output loop etc.When metal and oscillating circuit were close to certain distance, decay will take place in vibration or failure of oscillation changes, and sent control signal after this signal is sent into comparator in the chip circuit, and the output loop thyristor is ended, and disconnected action thereby finish switch.

As shown in Figure 3, circuit of the present utility model comprises: magnetic core coil L, capacitor C ₁The oscillating circuit, chip C (0161DB) treatment circuit, the thyristor T that form ₁Control circuit and D ₁-D ₄The output circuit of forming.

When metal during near coil L, its inductance changes, and LC oscillator oscillatory extinction or failure of oscillation are delivered to triode T after will signal handling through chip C ₂Make its conducting, thereby make thyristor T ₁End output loop L ₁And L ₂Between disconnect, promptly this disconnects near switch, finishes contactor J from being closed into the action of disconnection.Piezo-resistance R ₇The high pressure self-induced e.m.f that produces when cutting off the power supply for contactor J provides discharge loop.The utility model is fit in AC380V high voltage, the jumbo control loop of AC2000mA.

As shown in Figure 4, the method that the utility model uses is: when crane 7 (or dolly) when traveling is to the limit on track 11, it is approaching near switch 9 with the basis on the fixed support 10 to hit chi 8; switch disconnects; contactor disconnects, and cart is out of service, thus the danger of having protected cart to overstep the extreme limit.

Claims

1. one kind big capacity high voltage inductance approach switch is characterized in that being made up of metal, oscillating circuit, chip circuit and output loop.

2. big capacity high voltage inductance approach switch according to claim 1 is characterized in that chip circuit is is the circuit of core with the 0161DB chip.

3. big capacity high voltage inductance approach switch according to claim 1 is characterized in that 3 of LC oscillator output end and chip input are connected with 7 pin, and chip 1 pin and 6 pin are electric current output and power supply.

4. big capacity high voltage inductance approach switch according to claim 1 is characterized in that piezo-resistance R7 in parallel between described output loop lead-in wire L1 and the L2, produces the self-induced e.m.f discharge when being used for contactor J outage.