CN208189420U - A kind of magnetic induction limit switch device with self-retaining function - Google Patents

Abstract

The utility model belongs to relay holding circuit, in particular to a kind of magnetic induction limit switch device with self-retaining function, the associated loop structure being made of multiple switch and relay is integrated into limit switch, self-sustaining is carried out after switch motion, is reduced because site environment factor causes limit switch signal that malfunction occurs.

Description

A kind of magnetic induction limit switch device with self-retaining function

Technical field

The utility model belongs to relay holding circuit, in particular to a kind of magnetic induction limit with self-retaining function is opened Close device.

Background technique

Limit switch is also known as travel switch, and may be mounted at opposing stationary object, (such as fixed frame, doorframe, abbreviation are quiet Object) on or movement object (such as drive a vehicle, door, abbreviation animal) on.When animal is close to still life, the connecting rod driving of switch is opened The contact of pass causes the junction closure of contact disjunction or the disconnection of closure, so that the change by make and break contact opening and closing state is gone Control circuit and motor.

Limit switch has contact and contactless.The comparison of contact is intuitive: in the moving component of mechanical equipment Upper installation upper stroke switch, block or the installation site that extreme position is installed on the fixed point moved corresponding thereto are opposite.When When the mechanical contact of travel switch runs into block, (or changing) control circuit, mechanical just out of service or change fortune have been cut off Row.Contact limit switch uses extensively, but due to frequently directly contacting with block progress, can make the mechanical contact of limit switch It is subjected to displacement or loosens, the contact precision of limit switch is caused to be affected, can also reduce the service life of limit switch.

No matter contactless limit switch then without the influence of this respect, is all mentioned in terms of precision and service life Height, common contactless form have tongue tube, photo-electric, induction type etc., wherein the use of magnetic induction limit switch is more Extensively.

But there is also disadvantages in practice for magnetic induction limit switch, for example it is made after acting and does not have lasting energy Power, therefore the fixation device of magnetic induction limit switch usually can be due to site environment factor (such as vibrating larger, object to fall) And occur to loosen or tilt, cause limit switch to reset, to make relevant device that interlocking movement occur, can make when serious important Unit trip.

Utility model content

Technical problem to be solved by the utility model is: magnetic induction limit switch does not have continuous capability after making movement, It influences and resets vulnerable to site environment in practice,

In order to solve the above technical problems, the utility model provides a kind of magnetic induction limit switch with self-retaining function Device controls the folding of limit switch, including magnetosheath, the first contact by the relative motion between magnetosheath and limit switch End, induction block, the second contact jaw, first switch, second switch, third switch, limit switch, the first relay, second after Electric appliance, third relay, power supply,

It is designed by the distribution of position, makes the first contact jaw, induction block, the second contact jaw no external force the case where Under remain and be not in contact with each other, and magnetosheath can move near the first contact jaw, induction block, the second contact jaw under slave mode It moves, and generate magneticaction to block is incuded, induction block is attracted to contact end in contact with the first contact jaw, second respectively or divide It opens, but induction block cannot be made to contact simultaneously with the first contact jaw, the second contact jaw, i.e. the first contact jaw, induction block, second Contact jaw together constitutes the change-over switch of the device,

Wherein, only by the second contact jaw, induction block, the first relay, first switch, power supply first time in series Road,

First switch is normally off, and is connect with the second relay system,

Second relay only with the first contact jaw, induction block, power supply second servo loop in series；

First relay system connection second switch and third switch and control the opening and closing of second switch and third switch, the Two switches are in normally open with third switch,

Meanwhile second switch only with third relay, power supply tertiary circuit in series,

Only composition in parallel with block, the second contact jaw is incuded bypasses third switch；

Third relay system connection limit switch and the folding for controlling limit switch, limit switch are located at another independence Circuit in, control the working condition of electrical appliance in the circuit.

The self-sustaining magnetic induction limit switch device of this programme design, designs around limit switch and integrates associated loop Structure, it is small volume, light, it is easily installed and adjusts, reduce labour cost, improve installation effectiveness.It can be laggard in switch motion Row self-sustaining reduces because site environment factor causes limit switch signal that malfunction occurs, saves man power and material when maintenance, Direct economic loss and operations staff repair faced risk caused by reducing because of equipment malfunction.

Detailed description of the invention

Fig. 1 is that the element of the magnetic induction limit switch device in the utility model with self-retaining function and connection relationship are shown It is intended to, wherein 1-magnetosheath, 2-change-over switches, the 21-the first contact jaw, 22-induction blocks, the 23-the second contact jaw, 3- Limit switch, 4-power supplys, 5-external circuit, 6-electrical appliances, A-first switch (call " switch A " in the following text), B-second switch (under Claim " switch B "), C-third switchs (calling " switch C " in the following text), and the first relay of K1-(calls " relay K1 " in the following text), K2-second after Electric appliance (calls " relay K2 " in the following text), and K3-third relay (calls " relay K3 " in the following text).

Specific embodiment

The element and connection relationship such as attached drawing 1 of the magnetic induction limit switch device with self-retaining function of the utility model It is shown,

Based on apparatus above, controls the movement of magnetosheath 1 (may be assumed that magnetosheath 1 is to be moved up from down in the accompanying drawings) and kept off to induction Block 22 is close, and since magnetic force attracts, magnetosheath 1, which will incude, realizes contact conducting in the traction to the first contact jaw 21 of block 22, thus Making there is electric current to pass through in relay K2, relay K2 control switch A is in an open state by closure conversion, during this, relay There is no electric current process in K1, relay K3, therefore relay K1, relay K3 are not acted；

Magnetosheath 1 continues movement and is gradually distance from the first contact jaw 21, while answering block 22 and the based on magneticaction tugging One contact jaw 21 separates, and flows through the current vanishes of relay K2 at this time, and switch A is re-closed；

Magnetosheath 1 continues to move to the position close to the second contact jaw 23, and induction 22 Magnetic force tracting of block to second is connect Contact conducting is realized on contravention 23, has electric current to pass through in relay K1 at this time, and relay K1 control switch B and switch C are by beating Open state is converted to closure, and due to the closure of switch B, so that electric current is obtained electric sending movement by relay K3, relay K3, makes Limit switch 3 is closed, that is, reaches limit；

Magnetosheath 1 continues movement finally far from the first contact jaw 21, induction block 22,23 region of the second contact jaw, sense Answer block 22 to act on its Magnetic force tracting due to losing magnetosheath 1 and finally backed off with the second contact jaw 23, originally after Electric appliance K1 can be such that again switch B and switch C is in an open state by closed form conversion because electric current is lost, thus can be further Cause also to pass through without electric current in relay K3, reopens limit switch 3, the electrical appliance 6 of external circuit 5 also can not just continue It works,

But due to the design in this programme, when the second contact jaw 23 does not disconnect with induction block 22, where switch C There is electric current process in branch, and the second contact jaw 23 will continue to flow with the electric current from the branch when induction disconnection of block 22 Through relay K1, in other words, relay K1 will not power loss make switch B and switch C disconnection, and switch B is not turned off, and has been also ensured Electric current continuation pass through from relay K3, therefore relay K3 will not power loss and make limit switch 3 open, to realize limit The self-sustaining of 3 signal of switch.

When magnetosheath 1 is along backtracking, induction block 22 can be promoted to contact conducting, relay with the second contact jaw 23 first Device K1, K3 are still within to obtain electricity condition；Then, incude block 22 and the second contact jaw 23 disconnects, as previously discussed, relay K1, K3 are still within to obtain electricity condition；

When magnetosheath 1 is moved close to the first contact jaw 21, block 22 and the first contact jaw 21 are answered based on magneticaction tugging Contact conducting, relay K2, which obtains electric sending movement, is in an open state switch A by closure conversion, this necessarily loses relay K1 Electricity then makes switch B and switch C restore normally open, in this way passes through no current in relay K3, limit switch 3 also restores The electrical appliance 6 of normally open, external circuit 5 stops working；

Magnetosheath 1 continues movement finally far from the first contact jaw 21, induction block 22,23 region of the second contact jaw, sense Block 22 is answered finally to be detached from the first contact jaw 21 due to losing magnetosheath 1 to its Magnetic force tracting effect, relay K2 loses Electricity, switch A closure, but still no current flows through relay K1 at this time, also can not just make switch B and switch C closure and allow relay Device K3 obtains electric, and limit switch 3 can not be closed.

Claims (2)

1. a kind of magnetic induction limit switch device with self-retaining function, it is characterised in that: described device include magnetosheath (1), First contact jaw (21), induction block (22), the second contact jaw (23), first switch (A), second switch (B), third switch (C), limit switch (3), the first relay (K1), the second relay (K2), third relay (K3), power supply (4),

First contact jaw (21), the induction block (22), second contact jaw (23) are in no external force In the case where remain and be not in contact with each other, and the magnetosheath (1) can be in first contact jaw (21), the induction block (22), second contact jaw (23) moves about, and generates magneticaction to induction block (22) and attract the sense It answers block (22) to contact or separate with first contact jaw (21), second contact jaw (23) respectively, but cannot make described Induction block (22) contacted simultaneously with first contact jaw (21), second contact jaw (23), i.e., it is described first contact End (21), the induction block (22), second contact jaw (23) collectively form change-over switch (2),

Only by second contact jaw (23), the induction block (22), first relay (K1), the first switch (A), power supply (4) first circuit in series；

The first switch (A) is normally off, and is connect with described the second relay (K2) system, second relay (K2) opening and closing of the first switch (A) is controlled,

Only gone here and there by first contact jaw (21), the induction block (22), second relay (K2), the power supply (4) Connection constitutes second servo loop；

First relay (K1) the system connection second switch (B) and the third switch (C) simultaneously control institute The opening and closing of second switch (B) and third switch (C) are stated, the second switch (B) and third switch (C) are in often Open state,

Meanwhile the second switch (B) is only returned with the third relay (K3), the power supply (4) third in series Road,

The only composition bypass in parallel with the induction block (22), the second contact jaw (23) of the described third switch (C)；

Third relay (K3) the system connection limit switch (3) and the folding for controlling the limit switch (3).

2. as described in claim 1 with the magnetic induction limit switch device of self-retaining function, it is characterised in that: the limit Bit switch (3) is located in independent external circuit (5), controls the working condition of electrical appliance (6) in the external circuit (5).