CN209477731U

CN209477731U - A kind of real-time acquisition system of XY worktable absolute optical gate signal

Info

Publication number: CN209477731U
Application number: CN201920051687.XU
Authority: CN
Inventors: 顾嘉辉; 杨洪涛; 江磊; 杨鹏; 刘润泽
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2019-10-11
Anticipated expiration: 2029-01-11

Abstract

The utility model relates to a kind of real-time acquisition system of XY worktable absolute optical gate signal, including being fixed on X, the peripheral position acquisition hardware circuit of two absolute grating scales in Y-axis, differential received circuit, filter circuit, pressure limiting circuit composition.Level signal is converted into location information by the realization by DSP main control chip to Transistor-Transistor Logic level signal acquisition, software filtering, sensing algorithm, and by position coordinates real-time display in display module.For the utility model by differential received circuit, the differential signal of RS422 bus standard in absolute grating scale is converted into DSP can received Transistor-Transistor Logic level signal；Filter circuit filters out motor operating, signal transmission bring noise, improves the measurement accuracy of system；DSP main control chip is effectively protected by pressure limiting circuit；The interference of high-frequency harmonic is effectively eliminated by software filtering, improves the measuring precision；The operational capability powerful by DSP again, enables the location information of workbench to acquire display in real time.

Description

A kind of real-time acquisition system of XY worktable absolute optical gate signal

Technical field

The utility model relates to data acquisition technology field, specifically a kind of XY worktable absolute optical gate signal it is real-time Acquisition system.

Background technique

Demand of the modern society to high, refined, peak products is increasing, and then proposes higher want to the precision of numerically-controlled machine tool It asks.XY worktable is the important component of numerically-controlled machine tool, and position error is affect numerically-controlled machine tool machining accuracy main Therefore one of factor obtains the location information of XY worktable in real time, to carry out location error compensation to numerically-controlled machine tool to improve Numerically-controlled machine tool machining accuracy is very necessary.

Utility model content

The purpose of the utility model is to provide a kind of real-time acquisition systems of XY worktable absolute optical gate signal.The system Differential received circuit, the differential signal of RS422 bus standard in absolute grating is converted into DSP can received Transistor-Transistor Logic level Signal；The filter circuit of the system filters out motor operating, signal transmission bring noise, improves the measurement accuracy of system；This is The pressure limiting circuit of system is effectively protected DSP main control chip；The software filtering of the system effectively eliminates the dry of high-frequency harmonic It disturbs, improves the measuring precision；In addition the system can the position signal to workbench acquire display in real time.

The utility model realizes that purpose adopts the following technical scheme that

A kind of real-time acquisition system of XY worktable absolute optical gate signal, be optionally secured to X, two in Y-axis absolutely To formula grating scale, for obtaining X, the distance that Y-axis upper table moves and the differential signal for exporting RS422 bus standard；Difference Circuit is received, for the differential signal of RS422 bus standard to be converted into Transistor-Transistor Logic level signal；Filter circuit, for filtering out TTL Noise signal in level signal；Pressure limiting circuit protects late-class circuit for limiting the amplitude of output voltage；DSP master control core Piece is realized for Transistor-Transistor Logic level signal acquisition, software filtering, sensing algorithm, and level signal is converted into location information；Display Module is used for position coordinates real-time display.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land differential received circuit uses high speed photo coupling HCPL-0631.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land filter circuit uses 74LS14 Schmidt trigger, filters out motor operating, signal transmission bring noise.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land pressure limiting circuit uses 1N5222 zener diode.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land DSP main control chip is using TMS320F28335DSP and its peripheral power supply circuit, crystal oscillating circuit, reset circuit, JTAG electricity Road.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land software filtering is to be filtered by A, B group GPIO of DSP with input attributive function, filters out high-frequency signal interference.

Preferably, a kind of real-time acquisition system of XY worktable absolute optical gate signal provided by the utility model, it can Selection of land display module uses 12864 liquid crystal displays.

The utility model has the advantages that

Compared with prior art, its advantages are embodied in the utility model: the utility model is worked based on the XY of DSP The real-time acquisition system of platform absolute optical gate signal include be fixed on X, two absolute grating scales in Y-axis, differential received circuit, The peripheral position acquisition hardware circuit of filter circuit, pressure limiting circuit composition.Transistor-Transistor Logic level signal is adopted by DSP main control chip The realization of collection, software filtering, sensing algorithm, level signal is converted into location information and passes through 12864 LCD MODULEs will Coordinate real-time display.The utility model is believed the difference of RS422 bus standard in absolute grating scale by differential received circuit Number being converted into DSP can received Transistor-Transistor Logic level signal；By filter circuit, motor operating, signal transmission bring noise are filtered out, The measurement accuracy of raising system；DSP main control chip is effectively protected by pressure limiting circuit；It is effectively eliminated by software filtering The interference of high-frequency harmonic improves the measuring precision；The operational capability powerful by DSP again keeps the position signal of workbench real When acquisition display.In summary design of hardware and software can obtain the location information of workbench in real time, mend for subsequent position error It repays and lays the foundation.

Detailed description of the invention

Fig. 1 is a kind of system group of the real-time acquisition system of XY worktable absolute optical gate signal involved by the utility model Cheng Tu.

Fig. 2 is a kind of light of the real-time acquisition system of XY worktable absolute optical gate signal involved by the utility model The peripheral circuit structural schematic diagram of grid.

Fig. 3 is a kind of program flow of the real-time acquisition system of XY worktable absolute optical gate signal involved by the utility model Cheng Tu.

Fig. 4 is in one of a kind of real-time acquisition system of XY worktable absolute optical gate signal involved by the utility model Disconnected program flow diagram.

Specific embodiment

As shown in Figure 1, the real-time acquisition system of XY worktable absolute optical gate signal based on DSP includes being fixed on X, Y-axis On two absolute grating scales, for obtaining the mobile distance of X, Y-axis upper table and exporting the difference of RS422 bus standard Signal；Differential received circuit, for the differential signal of RS422 bus standard to be converted into Transistor-Transistor Logic level signal；Filter circuit is used In filtering out the noise signal on Transistor-Transistor Logic level signal；Pressure limiting circuit protects late-class circuit for limiting the amplitude of output voltage； DSP main control chip is realized for the acquisition of TTL level signal, software filtering, sensing algorithm, and level signal is converted into position Information；Display module is used for position coordinates real-time display.

As shown in Fig. 2, the periphery of a grating of the real-time acquisition system of XY worktable absolute optical gate signal based on DSP Electrical block diagram, an absolute grating scale output RS422 bus standard differential signal be respectively A+, A-, B+, B-.Be introduced by taking A+ and A- differential signal as an example below: the first step, A+, A- signal synthesize 1 by differential received circuit The TTL grating signal A on road, differential received circuit are made of HCPL-0631 high speed photo coupling, R3, R5, R7, R9, C3, C4, wherein R3=R5, R9=R7 > 10*R3；Second step, grating signal A are filtered TTL signal by Schmidt trigger 74LS14, Filter out motor operating, signal transmission bring noise；Third step, grating signal A after filtering out noise by by R1,1N5222, The pressure limiting circuit that C1 is constituted, by filtered TTL signal pressure limiting in 2.5V；The TTL signal of 2.5V is sent into DSP's by the 4th step GPIO12 mouthfuls.Similarly, differential signal B+, B- passes through differential received circuit, filter circuit, pressure limiting circuit, finally by the TTL of 2.5V The GPIO13 mouth of signal feeding DSP.Meanwhile the peripheral circuit structure of another grating is identical as its structure, only by 2.5V TTL signal be sent into DSP GPIO22 mouth with GPIO23 mouthfuls.

As shown in figure 3, the program flow diagram of the real-time acquisition system of XY worktable absolute optical gate signal based on DSP, beats Upper computer software CCS5.5 is opened, design is programmed according to flow chart.

As shown in figure 4, an interrupt routine stream of the real-time acquisition system of XY worktable absolute optical gate signal based on DSP Cheng Tu, another can also similarly write, and the counting to pulse number and the realization of sensing algorithm are realized in interrupt function.It obtains After obtaining pulse number, positional value is found out according to the pitch of grating and is shown on 12864 liquid crystal displays.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting Related claim.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims

1. a kind of real-time acquisition system of XY worktable absolute optical gate signal, it is characterised in that: be fixed on X, two in Y-axis Absolute grating scale, for obtaining X, the distance that Y-axis upper table moves and the differential signal for exporting RS422 bus standard；Difference Tap receives circuit, for the differential signal of RS422 bus standard to be converted into Transistor-Transistor Logic level signal；Filter circuit, for filtering out Noise signal on Transistor-Transistor Logic level signal；Pressure limiting circuit protects late-class circuit for limiting the amplitude of output voltage；DSP master control Chip is realized for Transistor-Transistor Logic level signal acquisition, software filtering, sensing algorithm, and level signal is converted into location information；It is aobvious Show module, is used for position coordinates real-time display.

2. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: Differential received circuit uses high speed photo coupling HCPL-0631.

3. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: Filter circuit uses 74LS14 Schmidt trigger, filters out motor operating, signal transmission bring noise.

4. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: Pressure limiting circuit uses 1N5222 zener diode.

5. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: DSP main control chip uses TMS320F28335DSP and its peripheral power supply circuit, crystal oscillating circuit, reset circuit, jtag circuit.

6. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: Software filtering is to be filtered by A, B group GPIO of DSP with input attributive function, filters out high-frequency signal interference.

7. a kind of real-time acquisition system of XY worktable absolute optical gate signal according to claim 1, it is characterised in that: Display module uses 12864 liquid crystal displays.