CN2085094U - Position test switch with magnetic indication - Google Patents

Abstract

The utility model relates to a position test switch with magnetic indication, comprising an upper magnetic steel (8), a lower magnetic steel (7), a driving medium (a lever), and a microswitch, wherein, the upper magnetic steel is made from materials of Nd, Fe, and B. The utility model can test the positional states of two relative movable objects whose effective distance of two magnetic poles is among 0 mm to 30 mm. The utility model has the advantages of installation simple, moisture proof, dust proof, shock proof, service life long, and work continuous; test signals can be directly transmitted to a controller because a power supply is not provided; the adaptability of the position test switch with magnetic indication is strong.

Description

Position test switch with magnetic indication

The utility model relates to a kind of general MAGNETIC INDUC-TION POSITION DE-TERMINGSWITCH, is applicable to the position probing to two objects that relatively move.

In technique known, about position detecting switch two big classes are arranged: first class is the traditional type travel switch of continuing to use for many years at present, is the object with two relative displacements of contact of meeting and discussing of switch.When allocation was given in testee arrival, shake-up was met and discussed, and drives the corresponding contacts open and close by transmission mechanism, thereby sends corresponding signal, reaches the position probing purpose.

Its shortcoming is that because this structure can not seal, greasy dirt, dust etc. causes the switch misoperation easily.Second largest class be transistor near switch, this class switch need not contact can make switch motion.Its principle be use ferromagnetic substance near and make the magnetic field closure, reach the purpose of input.Its shortcoming is: because it is to outside conditional request harshness, and inconsistent with the parameter of transistor own, noise margin is low, the poor anti jamming capability of switch, easily makes the switch misoperation.

The thin type passive magnetic induction formula that Chinese patent application (87200337) technology proposes is near switch.The magnetic force control safety switch that other patent application (87203049) technology proposes, though these two kinds of switches all belong to magnetic switch, but function is few, application is single-minded, the former can only finish the detection of close-fitting state between railway switch tongue and the stock rail, can not finish the position probing in the above zone of 4mm, also unsuitable general; The latter is the control safety switch, does not have position detecting function.

The purpose of this utility model is at the shortcoming of above-mentioned all kinds of switches and deficiency, proposes a kind of contactless MAGNETIC INDUC-TION POSITION DE-TERMINGSWITCH, can effectively detect two object spaces that relatively move.

The utility model is achieved in that MAGNETIC INDUC-TION POSITION DE-TERMINGSWITCH is made up of two parts, and top is upper shell (A), in upper magnetic steel (8) is housed, be fixed on the tested mobile object; The lower part is lower house (B), in lower magnetic steel (7) and transmission mechanism (lever), sensitive switch are housed, be fixed on (can be quiet, movable) on tested another object, in being in coverage 0-30mm scope between two magnetic poles, magnetic force change takes place, and makes the transmission mechanism lever produce adhesive or release movement.Thereby drive sensitive switch and make corresponding sports, position state signal is spread out of, realize position probing two objects by the sensitive switch lead-in wire.

Two housings up and down of this switch are to be made by namagnetic substance, each accessory in the housing are carried out hermetically sealed, play and install and protective effect.

Magnet steel in the housing all is that NdFeB material is made, and increases magnetic field force and guarantees measuring ability, and the magnet steel shape can be made garden cylindricality or rectangle, and its specification is decided according to detected coverage size.

The utility model has the advantages that:

(1) since with housing each accessory is carried out hermetically sealed, but moisture proof, dust protection, shockproof can conform, long continual continuous operation of life-span.

(2) signal that sends of this switch can directly be sent on all types of control apparatuses no specific (special) requirements.

(3) manufacture easily, install simply, volume is little, and cost is low.

Description of drawings:

Fig. 1: be the MAGNETIC INDUC-TION POSITION DE-TERMINGSWITCH structural representation

Code name is among the figure: (A) upper shell, (B) lower house, (1) common, (2) normally opened contact, (3) normally-closed contact, (4) balance pivot, (5) common junction, (6) lever drag effect point, (7) lower magnetic steel (dynamic action point), (8) upper magnetic steel (outer point of force application).

Further specify this switch working condition below in conjunction with accompanying drawing, also as the utility model embodiment:

With two parts of switch, be installed in respectively on two tested objects that relatively move, two housings (A), (B) are made by the stainless steel thin slice, and last lower magnetic steel (8), (7) become the garden cylindricality by neodymium-iron-boron magnetic material.Detect two magnetic pole coverage≤30mm.When tested distance＞30mm, because magnetic field force less than the elastic force of sensitive switch, makes contact (1) and contact (2) be off-state, and contact (1) is attracting state with contact (3).When tested distance≤30mm, then lower magnetic steel (7) moves to upper magnetic steel (8) owing to magnetic field gravitation, make sensitive switch make corresponding actions by leverage, contact even (1) and contact (2) adhesive, and contact (1) disconnects with contact (3), send the switching signal by lead-in wire, realize the position probing effect.

The utility model MAGNETIC INDUC-TION POSITION DE-TERMINGSWITCH, since in May, 90 be applied under the Taiyuan Iron and Steel Co. on the dump truck, result of use is good, popularize in an all-round way.In addition, this switch still can be applicable to hoist engine, overhead traveling crane limit switch, the position probing of lathe limit switch and other kind plant equipment.

Claims (6)

1, a kind of position detecting switch is characterized in that being made up of upper and lower two housings A, B, is contained in respectively on the two articles of relative displacement, and lower magnetic steel (7) (8) is housed respectively in housing, transmission mechanism (4) (5) (6) and sensitive switch (1) (2) (3).

2, according to the described switch of claim 1, it is characterized in that upper magnetic steel (8) is installed in the upper shell A, lower magnetic steel (7) and transmission mechanism (lever) and sensitive switch are installed in the lower house B, seal respectively.

3, require 1 described switch according to patent, it is characterized in that the transmission mechanism lever is made up of the line between fulcrum (4), common junction (5), drag effect point (6) and each point, line one end is connected with lower magnetic steel (7).

4, according to the described switch of claim 1, it is characterized in that sensitive switch reaches each connection lead-in wire by common (1), normally opened contact (2), normally-closed contact (3) and forms, the common lead-in wire is connected with common junction (5).

5,, it is characterized in that the effective action distance is only limit between 0-30mm between two magnetic poles according to the described switch of claim 1.

6,, it is characterized in that two magnet steel are to adopt neodymium-iron-boron magnetic material to make according to the described switch of claim 1.