CN102339067B - Limit switch with adjustable triggering position - Google Patents
Limit switch with adjustable triggering position Download PDFInfo
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- CN102339067B CN102339067B CN201010236913.5A CN201010236913A CN102339067B CN 102339067 B CN102339067 B CN 102339067B CN 201010236913 A CN201010236913 A CN 201010236913A CN 102339067 B CN102339067 B CN 102339067B
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- counter
- trigger
- limit switch
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- switch
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Abstract
The invention relates to a limit switch with an adjustable triggering position and belongs to the technical field of an electric control device. The limit switch comprises a triggering mechanism and a control part, wherein the triggering mechanism comprises a triggering rod arranged on an equipment stroke, a trigger linked with the triggering rod and a digital sensor close to the trigger; the control part comprises a counter, a dial switch and a comparator; an output end of the digital sensor is connected to an input end of the counter; the output ends of the counter and dial switch are connected to the input end of the comparator; a controlled end of the counter is externally connected to the output end of a running controller of the equipment; and the output end of the comparator is externally connected to the input end of the running controller of the equipment. Compared with the existing limit switch, the limit switch provided by the invention has a single fixed triggering position. By manually revising a preset value, an equivalent effect of forming a plurality of continuous adjustable triggering positions is achieved. Especially, with regard to a condition of insufficient equipment stroke, the normal stable triggering of the limit switch can be ensured without on-site adjustment.
Description
Technical field
The present invention relates to a kind of limit switch, belong to electrical control device technical field.
Background technology
Limit switch is the electrical control device of a kind of conventional detection controlled motion equipment (as oil cylinder, lifter etc.) position, is normally arranged on the desired location of equipment moving stroke (circuit).When equipment moving arrives this position, by a projection that is fixed on certain position of sports equipment, press limit switch, thereby the contact of limit switch is triggered (being the closing of contact or disconnection), and then the stop motion of output signal opertaing device.
Existing limit switch requires very high to the pressing degree of projection, conventionally must meet the contact that certain pressure force could trigger limit switch, when therefore existing limit switch is generally pressed to a certain position (normally a certain corner or a certain displacement point) by projection, just trigger contact, that is to say that existing limit switch only has a fixing triggering contact position.Such as, the angular range that the frizzen of existing limit switch after by projection pressing rotates is generally 5 °～75 °, but the position that actual pot life bit switch is triggered is frizzen turns to 5 ° of angle positions at that moment, rather than the angle position of all rotations between 5 °～75 °.
In actual use, equipment for a long time with after its movement position always produce deviation, therefore there will be the limit switch contact causing because of device travel deficiency trigger unstable, even trigger, or because of three kinds of phenomenons being interrupted of the limit switch that causes of stroke.Wherein, when the limit switch that the equipment that generally only occurs is crossed stroke (as corner is greater than 75 °) is interrupted or the limit switch of device travel deficiency does not trigger (as corner is less than 5 °), the check man talent goes site inspection; And slightly not enough or skip over and cause limit switch to trigger unsettled situation generally all to do nothing for more common device travel, just sometimes according to the simple position of observing on-the-spot coarse adjustment limit switch.But it is larger to the harm of equipment proper motion that limit switch triggers unsettled situation, and its performance has: the one, and can not accurately learn that it is that equipment is crossed stroke or stroke is not enough that limit switch triggers unstable, thereby can not to equipment, safeguard in time and overhaul; The 2nd, even if the equipment of rule of thumb judging was one of stroke and stroke deficiency, also can only be according to estimating by manually going to the on-the-spot position that regulates roughly limit switch, can not effectively solve limit switch and trigger unsettled problem, thereby still cause equipment fluctuation of service; The 3rd, existing limit switch is generally fixed on base by four standing screws, and the on-the-spot position of adjusting bothers very much, easily delays equipment operation and produces.To sum up, for existing limit switch, because of device travel, omit deficiency or skip over to cause and trigger unsettled situation, there is no at present effective solution; The method of going Field adjustment limit-switch positions is at present again blindly completely, not only can delay equipment operation and produce, once break down, needs integral replacing electrical control gear, and waste is serious.
Summary of the invention
The technical matters that the present invention solves is: propose a kind ofly when device travel changes, without Field adjustment position, still can meet by the limit switch of operational outfit triggered as normal.
In order to solve the problems of the technologies described above, the technical scheme that the present invention proposes is: a kind of trigger bit adjustable limit switch, comprises trigger mechanism and control section; Described trigger mechanism contains the frizzen being arranged in device travel, the digital sensor of the trigger connecting with frizzen and close trigger; Described control section contains counter, toggle switch and comparer, the input end of the output termination counter of described digital sensor, the input end of the output termination comparer of described counter and toggle switch, the output terminal of the operation controller of the external described equipment of controlled end of described counter, the input end of the operation controller of the external described equipment of signal output part of described comparer.
Limit switch of the present invention in use, when equipment positive movement, the operation controller output signal control counter of equipment is opened plus coujnt, equipment pressing frizzen makes frizzen produce motion (rotate or move), drive trigger positive movement (rotate or move), digital sensor carries out record to the positive movement process of trigger, and the digital signal of record is passed to counter and carry out plus coujnt; Otherwise, during equipment counter motion, the operation controller output signal control counter of equipment is opened subtraction counting, and equipment leaves frizzen, digital sensor carries out record to the counter motion process of trigger, and the digital signal of record is passed to counter and carry out subtraction counting.Before use, can determine that in equipment moving, pressing frizzen produces the upper limit value and lower limit value of count value and determines suitable intermediate value according to testing, this intermediate value is passed through to toggle switch input comparator as setting value.When reality is used, the actual count value that in equipment moving, pressing frizzen produces is by counter also input comparator like this, and whether comparer reaches setting value according to actual count value produces trigger pip output, with opertaing device motion, stops.One, when actual count value can not reach setting value but still be greater than lower limit, can judge that now equipment moving produces stroke deficiency, now can people reduce setting value and the setting value of turning down is re-entered to comparer, as long as the actual count value that counter produces reaches the setting value of again turning down, comparer produces trigger pip output.Two, when actual count value surpasses setting value but still is less than higher limit, can judge that now equipment moving produced stroke, now can artificially increase setting value and the setting value tuning up is re-entered to comparer, as long as the actual count value that counter produces reaches the setting value again tuning up, comparer produces trigger pip output.While there is above two kinds of situations, all can learn in time the variation of equipment moving stroke, by increasing the quantity (closeness) of count value, can make this variation seem more accurate; And without the position of removing Field adjustment limit switch, can guarantee normally stable triggering of limit switch, thereby avoided causing limit switch to trigger unstable brought equipment fluctuation of service, produce to delay with maintenance cost and increase because device travel changes.
By equipment, the absolute displacement after to limit switch pressing changes into digital signal to trigger bit adjustable limit switch of the present invention, by record actual count value and with setting value comparison, can accurately learn the state that device travel changes and control the triggering (accomplishing to know what's what) of limit switch; And by the artificial setting value of revising, within the Upper-lower Limit changing in device travel, effectively guaranteed normally stable triggering of limit switch.With respect to existing limit switch, only has single fixing trigger position, limit switch of the present invention is by the artificial setting value of revising, be equivalent to form a plurality of continuously adjustable trigger positions, especially for the situation (while being slightly less than 5 ° such as frizzen rotation) of device travel deficiency, still can guarantee normal stable triggering of limit switch without Field adjustment.
The one of perfect of technique scheme is: described trigger is and the coaxial mounted rotating disk of frizzen afterbody that described digital sensor is the pulse approach switch near rotating disk; In the circumferential edge of described rotating disk, be shaped with the circular hole of equidistant regular distribution.
Perfect two of technique scheme is: described trigger is the gauge rod that is fixed on frizzen afterbody, is shaped with the breach of equidistant regular distribution on described gauge rod.
Perfect three of technique scheme is: described trigger is rotating disk, and described frizzen afterbody is coaxially installed with gear wheel, and described rotating disk is coaxially installed with the pinion wheel with gear wheel engagement.
The improvement of technique scheme is: described rotating disk is also coaxially installed with the synchronous rotating disk of carving mouth with semilune, is provided with synchronizing pulse approach switch, another input end of the output termination counter of described synchronizing pulse approach switch near described synchronous rotating disk.
accompanying drawing explanation
Below in conjunction with accompanying drawing, trigger bit adjustable limit switch of the present invention is described further.
Fig. 1 is the structure principle chart of the embodiment of the present invention one trigger bit adjustable limit switch.
Fig. 2 is the structure principle chart of the embodiment of the present invention two trigger bit adjustable limit switchs.
Fig. 3 is the structure principle chart of the embodiment of the present invention three trigger bit adjustable limit switchs.
embodiment
Embodiment mono-
The trigger bit adjustable limit switch of the present embodiment as shown in Figure 1, comprises trigger mechanism and control section; Trigger mechanism is generally placed in scene, and control section can be placed in scene also can be placed in far-end pulpit.Trigger mechanism contains the frizzen 1 being arranged in device travel, the digital sensor of the trigger connecting with frizzen 1 and close trigger; Trigger is and the coaxial mounted rotating disk 2 of frizzen 1 afterbody that digital sensor is the pulse approach switch 3 near rotating disk 2, is shaped with the circular hole 4 of equidistant regular distribution in the circumferential edge of rotating disk 2.Control section contains counter 5, toggle switch 6 and comparer 7, the input end of the output termination counter 5 of pulse approach switch 3, the input end of the output termination comparer 7 of counter 5 and toggle switch 6.The output terminal of the operation controller of the controlled end external equipment of counter 5 (generally adopting PLC), the output terminal L of comparer 7 the input end of operation controller PLC of M external equipment.
Counter 5 adopts add/down counter of the synchronous tetrad of single clock, and model is 74LS191; The model of comparer 7 is TTL7485.
The use procedure of the present embodiment can be referring to the 3rd paragraph in aforementioned summary of the invention, what wherein need supplementary notes is, what the frizzen 1 of the present embodiment produced under equipment pressing is to rotate, circular hole in rotating disk 2 circumferential edge of 3 pairs of rotations of pulse approach switch produces continuously pulse signal and sends to counter 5 (proper property of pulse approach switch, repeats no more).For example, for oil cylinder operation, through experiment (normally in oil cylinder operation for the first time time), determine that counting upper limit value and lower limit value is 50,0, suitable intermediate value is 30, using 30 as setting value by toggle switch 6 input comparators 7.At oil cylinder, move after a period of time, the actual count value of counter 5 becomes 25, can judge that now cylinder movement produces stroke deficiency, can judge that oil cylinder exists jam or shortening simultaneously, and oil cylinder is carried out to deteriorated tracking, now can be using 20 (numeral between 25-20 all can) as new setting value, re-enter comparer 7, like this when the actual count value of counter 5 reaches 20, comparer 7 can produce the operation controller PLC that trigger pip outputs to equipment, thereby opertaing device stops.At oil cylinder, move after a period of time, the actual count value of counter 5 becomes 35, can judge that now cylinder movement produced stroke, can judge that oil cylinder exists valve to be worn simultaneously, and oil cylinder is carried out to deteriorated tracking, now can be using 40 (numeral between 35-40 all can) as new setting value, re-enter comparer 7, like this when the actual count value of counter 5 reaches 40, comparer 7 can produce the operation controller PLC that trigger pip outputs to equipment, thereby opertaing device stops.Because setting value can artificially be adjusted within the scope of upper limit value and lower limit value, therefore within the limit (equipment interrupts frizzen 1 and the not pressing frizzen 1) scope of deviation appears in device travel, all can artificially regulate setting value to guarantee that the trigger bit adjustable limit switch normal reliable of the present embodiment triggers; The trend of simultaneously all right very clear device travel deviation, so that timely repair apparatus.
Embodiment bis-
The trigger bit adjustable limit switch of the present embodiment as shown in Figure 2, it is a kind of variation on embodiment mono-basis, the difference of itself and embodiment mono-is: trigger replaces rotating disks 2 by the gauge rod 8 that is fixed on frizzen 1 afterbody, is shaped with the breach 9 of equidistant regular distribution on gauge rod 8.
What the frizzen 1 of the present embodiment produced under equipment pressing is mobile.Its use procedure and aforementioned similar, does not repeat them here.
Embodiment tri-
The trigger bit adjustable limit switch of the present embodiment as shown in Figure 3, it is the another kind variation on embodiment mono-basis, the difference of itself and embodiment mono-is: 1) at frizzen 1 afterbody, be coaxially installed with gear wheel 10, rotating disk 2 does not connect with frizzen 1 afterbody but is coaxially installed with the pinion wheel 11 with gear wheel 10 engagements; 2) rotating disk 2 is also coaxially installed with the synchronous rotating disk 12 of carving mouth 14 with semilune, near synchronous rotating disk 12, is provided with synchronizing pulse approach switch 13, another input end of the output termination counter 5 of synchronizing pulse approach switch 13.
The present embodiment by the rotation of frizzen 1 by a pair of large and small gear 10,11 transmissions to rotating disk 2, can improve the pulse signal frequency of pulse approach switch 3, increase the quantity (closeness) of the count value of counter 5, thereby can improve the degree of accuracy that comparer 7 produces trigger pip.The effect of synchronous rotating disk 12 and synchronizing pulse approach switch 13 is to guarantee that pulse approach switch 3 can not produce rub-out signal (semilune on 13 pairs of synchronous rotating disks 12 of synchronizing pulse approach switch is carved mouthful 14 generation pulse signals with the switch of control counter 5, and the proper property of pulse approach switch does not repeat them here) because of rotating disk 2 misoperations; Also can be simultaneously and multipair pulse approach switch 3 is set and rotating disk 2 provides work enabling signal.
The concrete technical scheme being not limited to described in above-described embodiment of the present invention, such as: 1) except rotating disk 2 and gauge rod 8, trigger can also be other versions; 2) digital sensor, except pulse approach switch, can also be photoimpact switch, magnetoelectricity pulse switch or other digital sensors; 3) model of counter 5 and comparer 7 is also not limited to the disclosed kind of above-described embodiment and model; 4) can combination with one another between the technical scheme of above-described embodiment, all employings are equal to replaces the technical scheme forming and is the protection domain that the present invention requires.
Claims (2)
1. a trigger bit adjustable limit switch, comprises trigger mechanism and control section; It is characterized in that: described trigger mechanism contains the frizzen being arranged in device travel the digital sensor of the trigger connecting with frizzen and close trigger; Described control section contains counter, toggle switch and comparer, the input end of the output termination counter of described digital sensor, the input end of the output termination comparer of described counter and toggle switch, the output terminal of the operation controller of the external described equipment of controlled end of described counter, the input end of the operation controller of the external described equipment of signal output part of described comparer; Described trigger is rotating disk, and described frizzen afterbody is coaxially installed with gear wheel, and described rotating disk is coaxially installed with the pinion wheel with gear wheel engagement.
2. trigger bit adjustable limit switch according to claim 1, it is characterized in that: described rotating disk is also coaxially installed with the synchronous rotating disk of carving mouth with semilune, near described synchronous rotating disk, be provided with synchronizing pulse approach switch, the signal output part of described synchronizing pulse approach switch connects another input end of counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236913.5A CN102339067B (en) | 2010-07-27 | 2010-07-27 | Limit switch with adjustable triggering position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236913.5A CN102339067B (en) | 2010-07-27 | 2010-07-27 | Limit switch with adjustable triggering position |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102339067A CN102339067A (en) | 2012-02-01 |
| CN102339067B true CN102339067B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010236913.5A Expired - Fee Related CN102339067B (en) | 2010-07-27 | 2010-07-27 | Limit switch with adjustable triggering position |
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| Country | Link |
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| CN (1) | CN102339067B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106650909B (en) * | 2017-02-27 | 2023-05-30 | 中冶华天工程技术有限公司 | Enclosed shell type photoelectric rotary dial counting device |
| CN107117088A (en) * | 2017-03-31 | 2017-09-01 | 安徽丰源车业有限公司 | A kind of Large Dump Truck rollover system |
| CN112408201B (en) * | 2020-10-23 | 2022-04-05 | 中联重科股份有限公司 | Safety detection method and device for limiter of tower crane |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2056542U (en) * | 1988-04-30 | 1990-04-25 | 湘潭机电专科学校 | Limit switch for tower crane |
| CN1319860A (en) * | 2000-03-23 | 2001-10-31 | 富士电机株式会社 | Operation lever type limit switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5629103A (en) * | 1979-08-17 | 1981-03-23 | Mitsubishi Electric Corp | Limit switch device |
| JP2684358B2 (en) * | 1984-06-18 | 1997-12-03 | 株式会社 エスジー | Control signal generator |
-
2010
- 2010-07-27 CN CN201010236913.5A patent/CN102339067B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2056542U (en) * | 1988-04-30 | 1990-04-25 | 湘潭机电专科学校 | Limit switch for tower crane |
| CN1319860A (en) * | 2000-03-23 | 2001-10-31 | 富士电机株式会社 | Operation lever type limit switch |
Non-Patent Citations (6)
| Title |
|---|
| JP昭56-29103A 1981.03.23 |
| JP昭61-3204A 1986.01.09 |
| 吴天一.限位控制容错能力的提高.《石油化工自动化》.2010,(第2期), |
| 武锋等.软限位开关的设置原理与应用.《电气技术》.2009,(第10期), |
| 软限位开关的设置原理与应用;武锋等;《电气技术》;20091231(第10期);正文第47页右栏第3段-第48页右栏最后1段，图1-2 * |
| 限位控制容错能力的提高;吴天一;《石油化工自动化》;20101231(第2期);正文第70页左栏第3段-右栏最后1段，图2 * |
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| CN102339067A (en) | 2012-02-01 |
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