CN2921785Y

CN2921785Y - Rotary displacement transducer

Info

Publication number: CN2921785Y
Application number: CN 200620097805
Authority: CN
Inventors: 高钰敏; 聂道静
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-14
Filing date: 2006-07-14
Publication date: 2007-07-11
Anticipated expiration: 2016-07-14

Abstract

A rotary displacement transducer belonging to sensor technology field is mainly used for detecting opening of equipments such as crane, comprising a sensor casing body, wherein, an increment type coder is connected with the singlechip count port in a peripheral singlechip circuit through a signal isolation circuit; the peripheral singlechip circuit includes a power supply connected with the singlechip; the singlechip is also connected with a clock crystal oscillator, a ferroelectric memory and a switch input; the communication processing circuit connected with the singlechip is used as a signal output circuit. The utility model collects pulse change of the increment type coder and ceaselessly stores the collected data in the ferroelectric memory so as to transfer the data to background collection equipment through digital communication mode together with a peripheral device, thereby overcoming the disadvantages of the increment type coder and realizing furthest the functions of an absolute type coder.

Description

The swing offset sensor

Technical field

The utility model relates to a kind of sensor device that utilizes incremental encoder reliably to gather absolute displacement positions such as aperture, height, especially can detect the aperture of equipment such as crane, gathers the sensor of aperture, height by the rotation amount of reel.

Background technology

The aperture signals collecting of crane or power station headstock gear shows that the safe operation for hoisting device is very important and necessary.And the variation of the aperture of crane and headstock gear is along with lifting drum rotation folding and unfolding wire rope, thereby makes what unlatching aperture height changed.General on the market acquisition mode has two kinds now, with potentiometer and multiturn absolute type scrambler and the variation of reel rotation collection aperture.

The potentiometer collection is the resistance variations that the rotation change of reel is converted to potentiometer, and the variation of output voltage is to the background devices collection.Because the lifting drum rotating cycle is tens to circles up to a hundred generally speaking, the aperture scope of lifting is also from tens meters to tens meters.If resistance variations (being generally 0-5K) or voltage output (being generally 0-5V) with potentiometer detect the variation of demonstration circles up to a hundred or tens meters variation, obviously the variation of each meter is reflected to the number of turns or change in voltage is very little, so degree of accuracy and resolution are far from being enough.And since this be that what to adopt is the analog quantity processing mode, on the crane main equipment, use because the motor work on reel next door and output line be to the power cable influence of cab, the antijamming capability meeting is very poor.Data presented will be stable beat.Therefore not only resolution is not enough for this approach sensor, provides the aperture numerical range on can only be probably, and accuracy, degree of accuracy can not be satisfied the demand.

The multiturn absolute type scrambler is by the uniqueness of each position of mechanical location decision, and it need not memory, need not to look for reference point, and need not count always, when needs location aware, when just goes to read its position.But the ability of domestic not production high precision multiturn absolute type scrambler must rely on import at present.And the costing an arm and a leg of import multiturn absolute type scrambler, and the source of goods, accessory, after sale all can't guarantee.

Summary of the invention

The purpose of this utility model provides a kind of incremental encoder that utilizes, single chip circuit by the periphery increase, realization is to the position probing of reel rotation amount, not only image data accurately, accurately, and with the output of the communication digital signal of standard, do not take place electricly to get in touch the jaw opening sensor that antijamming capability is strong altogether with background acquisition equipment.

The purpose of this utility model is achieved in that a kind of swing offset sensor, comprise sensor housing 1, incremental encoder 4 is connected by the numeration mouth of single-chip microcomputer 3 in the single chip circuit of signal isolation circuit 5 and periphery, peripheral single chip circuit comprises power supply 2, power supply 2 is connected with single-chip microcomputer 3, also being connected with clock crystal oscillator 6, ferroelectric memory 7, switching value input 8 of single-chip microcomputer 3, the communication treatment circuit 9 that is connected with single-chip microcomputer 3 is as signal output apparatus.Signal isolation circuit 5 is that two photoelectric coupling circuits are connected with two outputs of incremental encoder 4 respectively.

Swing offset sensor provided by the utility model, A, B by the incremental encoder output that alternates, judge the sense of rotation of scrambler, thereby can analysis and judgement going out the aperture signal and being increases or reduces, can simulate the function that realizes absolute type encoder to the full extent, thereby reach the effect that absolute type encoder is gathered on height, length, and realize that cost will be significantly less than the absolute type photoelectric encoder.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

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

Embodiment

Principle of work of the present utility model is as follows:

Incremental encoder 4 can adopt XTAL11.0592, at present domestic can ripe production and processing incremental encoder arranged, incremental encoder has three road signals output (difference has six road signals): A usually, and B and Z generally adopt Transistor-Transistor Logic level, the A pulse is preceding, the B pulse after, A, the B pulse differ 90 the degree, every circle sends a Z pulse, can be used as with reference to mechanical zero.Increment of rotation formula scrambler is the output pulse when rotating, and the umber of pulse of using every circle to produce is measured, number from 6 to 5400 or higher, and umber of pulse is many more, and resolution is high more.

Because incremental encoder is to adopt rotation output pulse, every circle is evenly exported the definite value pulse.Stopping the rotation does not just have pulse output yet, measurements that can infinitely add up, so needing to be widely used in the environment of measuring speed or acceleration.The measuring position aperture then can't be handled.

But the technology maturation of incremental encoder, low price.Because it is the output pulse that can add up, be not subjected to the restriction of reel rotating cycle, and its every circle can export thousands of pulses, and the rotation of the every circle of reel generally is exactly several meters of apertures.Several meters variation is for several thousand pulses as can be seen, and it is following that degree of accuracy can reach millimeter.Incremental encoder is the variation of digital signal simultaneously, and data stabilization is not drifted about.Based on above advantage, if can utilize the characteristics of incremental encoder, use the collection of aperture and measure, its performance, degree of accuracy, resolution, stable etc. will be better than potentiometer far away and near absolute type encoder, and will be well below absolute type encoder on the Costco Wholesale.

The utility model is exactly by the A of incremental encoder 4, the B output that alternates, and judges the sense of rotation of scrambler, is to increase or reduce thereby can analysis and judgement go out the aperture signal.

Every circle umber of pulse of incremental encoder 4 can be selected so just can differentiate millimeter greatly, guarantees degree of accuracy.By just being fixedly mounted on the other treatment circuit of incremental encoder, just with incremental encoder one by one pulse signal count and be converted to actual output pulse sum.Be equivalent to the generation of a continuous data of saying so, and no longer be an independent pulse output.The working method of similar simulation absolute type encoder, the pulse sum of output is exactly the data of absolute position.

In order to make the collection of scrambler have real-time function, pulse-losing total data easily, and need prevent to power on again after the dead electricity and do not have data refer to put the disadvantage of this incremental encoder, the inner integrated ferroelectric storer 7 of circuit, utilize ferroelectric memory 7 storage number of times can almost unlimited storage and read-write do not damage, storage data and read data operation are very fast, there is not delay operation, read data or write data are exactly these characteristics of time of 1 microsecond, each cycle period does not stop in the single-chip microcomputer course of work writes real-time pulse sum, and outage so at any time can the pulse-losing data yet.When powering on once more, after the pulse total data that will preserve last time is read, just can continue the total data of accumulative total aperture signal from ferroelectric memory 7.And the speed of single-chip microcomputer 3 program loop is very fast, and less than 1 millisecond, and the pulse change that actual aperture operation time scrambler is taken place not is very fast, so just can guarantee data accurately and add up correctly.The function of the maximized approximate absolute type encoder of whole functional.

A whole set of reactance road circuit concentrates on by the scrambler, is in order to increase antijamming capability.Because if to the secondary instrument place, it is placed in forceful electric power interference place with this circuit design, can the interfering data storage chip, be expendable in case disturb the words fallen for the signal of incremental encoder, must readjust.And a whole set of circuit together, and entirely current potential also can connect, and is easy to generate the interference on the ground wire.The mode that is now adopted is kept apart power supply, the signal output of scrambler, single-chip microcomputer work, the output of 485 communication signals of scrambler by DC/DC power supply 2, and the ground wire of any like this part disturbs the steady operation that can not have influence on total system.

Single-chip microcomputer 3 can adopt STC89C20521, and ferroelectric memory 7 adopts FM24C16, adopts RS485 75LBC184, adopts two-way photoelectricity coupling 4N25 to be connected with A, the B output of incremental encoder 4 respectively.

The course of work of the present utility model is: the signal of incremental encoder 4 is at first introduced the numeration mouth of single-chip microcomputer by buffer circuit 5, and isolating like this is to seal in order to prevent to disturb.In the time of incremental encoder 4 rotation, single-chip microcomputer 3 numeration summation pulse numbers, and judge it is to increase umber of pulse or minimizing umber of pulse according to the order of pulse.The data variation of the numeration incremental encoder that scm managing system does not stop, that does not stop simultaneously then carries out the data storage exchange with ferroelectric memory 7.With current substantial amt according to remembering ferroelectric memory FM24C16 the inside.Detect the data bus data of communication treatment circuit 9, detect whether the data acquisition request command is arranged,, just current total data is transferred to background acquisition equipment 10 according to 485 communications protocol if the request of data acquisition is arranged.Whether detect on the other hand has switching value to import the variation of 8 signals, come verification ferroelectric memory internal data with this, whether see current real data and to be stored in memory data in advance identical, difference then will be stored data in advance and be called in present data, preserve as checking data.

Claims

1, a kind of swing offset sensor, comprise sensor housing (1), it is characterized in that: incremental encoder (4) is connected by the numeration mouth of single-chip microcomputer (3) in the single chip circuit of signal isolation circuit (5) and periphery, peripheral single chip circuit comprises power supply (2), power supply (2) is connected with single-chip microcomputer (3), also being connected with clock crystal oscillator (6), ferroelectric memory (7), switching value input (8) of single-chip microcomputer (3), the communication treatment circuit (9) that is connected with single-chip microcomputer (3) is as signal output apparatus.

2, swing offset sensor according to claim 1 is characterized in that: signal isolation circuit (5) is that two photoelectric coupling circuits are connected with two outputs of incremental encoder (4) respectively.