CN204142175U - A kind of portable spindle rotation error measuring instrument - Google Patents

Abstract

The utility model discloses a kind of portable spindle rotation error measuring instrument, comprise FPGA, DSP, signal broadening circuit, capacitance gage, signal conditioning circuit, A/D circuit and touch-screen, the input end input of signal broadening circuit is arranged on the grating Z pulse signal of the increment type grating scale output on main shaft, the signal output part of capacitance gage is connected with the input end of signal conditioning circuit, the output terminal of signal conditioning circuit is connected with the input end of A/D circuit, the output terminal of A/D circuit is connected with the output terminal of signal broadening circuit is corresponding with the signal input part of FPGA respectively, FPGA and touch-screen are corresponding with DSP to be respectively connected.Portable spindle rotation error measuring instrument described in the utility model adopts FPGA+DSP framework, and realize the acquisition and processing of data, utilize touch-screen to realize man-machine interaction, instrument is had, and volume is little, low in energy consumption, easy to carry, the simple and easy straight advantage of data interpretation.

Description

A kind of portable spindle rotation error measuring instrument

Technical field

The utility model relates to a kind of spindle rotation error measuring instrument being mainly used in air spindle and measuring, and particularly relates to that a kind of precision is high, volume is little, the portable spindle rotation error measuring instrument of low in energy consumption, easy to carry, data interpretation Simple visual.

Background technology

In the plant equipment that the precision requirement such as high precision machine tool processing, precision centrifuge are higher, extensive employing air spindle is as precision rotation parts, the performance of air spindle is the key factor of influential system operating accuracy, and air spindle turn error is one of performance parameter of main shaft most critical.When adopting outer reference measurement precision centrifuge Dynamic Radius, Radial mixing is included in Dynamic Radius measurement result, and the precision centrifuge radius of clean-up is relative to instantaneous axis of rotation, Radial mixing should be rejected from dynamic radius measurement result.In addition, need when carrying out an acceptance inspection to air bearing to detect its turn error size; In addition, also need to measure the status monitoring amount of Radial mixing as air bearing gap in real time during air spindle running.Therefore, the turn error measurement carrying out air bearing has important practical significance to air spindle development.

Current air spindle turn error measuring system most Based PC bussing technique or singlechip technology: PC bussing technique utilizes high performance modularized hardware, software in conjunction with high efficient and flexible completes various test and data handling utility, be easy to realize, construction cycle is short, but system power dissipation, volume are large, cost is high, and be unfavorable for carrying; And when adopting single-chip microcomputer measuring system constructing, data-handling capacity is limited, measuring accuracy is low and depend on PC and assisted test.

Utility model content

The purpose of this utility model is just to provide to solve the problem that a kind of precision is high, volume is little, the portable spindle rotation error measuring instrument of low in energy consumption, easy to carry, data interpretation Simple visual.

The utility model is achieved through the following technical solutions above-mentioned purpose:

A kind of portable spindle rotation error measuring instrument, comprise FPGA, DSP, signal broadening circuit, capacitance gage, signal conditioning circuit, A/D circuit and touch-screen, the input end input of described signal broadening circuit is arranged on the grating Z pulse signal of the increment type grating scale output on described main shaft, the signal output part of described capacitance gage is connected with the input end of described signal conditioning circuit, the output terminal of described signal conditioning circuit is connected with the input end of described A/D circuit, the output terminal of described A/D circuit is connected with the output terminal of described signal broadening circuit is corresponding with the signal input part of described FPGA respectively, described FPGA and described touch-screen are corresponding with described DSP to be respectively connected.

As preferably, described capacitance gage is six, six described capacitance gages are arranged on the outside support of described main shaft, three described capacitance gages are arranged respectively, the opposing parallel installation of described capacitance gage circumferentially that wherein two described cross sections are corresponding around two cross sections of described main shaft; Described A/D circuit is 24,6 tunnel A/D circuit.

The beneficial effects of the utility model are:

Portable spindle rotation error measuring instrument described in the utility model adopts FPGA+DSP framework, and realize the acquisition and processing of data, utilize touch-screen to realize man-machine interaction, instrument is had, and volume is little, low in energy consumption, easy to carry, the simple and easy straight advantage of data interpretation.

Accompanying drawing explanation

Fig. 1 is the circuit block diagram of portable spindle rotation error measuring instrument described in the utility model;

Fig. 2 is the mounting structure schematic perspective view of capacitance gage described in the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figure 1, portable spindle rotation error measuring instrument described in the utility model comprises FPGA, DSP, signal broadening circuit, capacitance gage, signal conditioning circuit, A/D circuit and touch-screen, the input end input of described signal broadening circuit is arranged on the grating Z pulse signal of the increment type grating scale output on described main shaft, the signal output part of described capacitance gage is connected with the input end of described signal conditioning circuit, the output terminal of described signal conditioning circuit is connected with the input end of described A/D circuit, the output terminal of described A/D circuit is connected with the output terminal of described signal broadening circuit is corresponding with the signal input part of described FPGA respectively, described FPGA and described touch-screen are corresponding with described DSP to be respectively connected.

The stabilization of speed signal of normal signal required for spindle rotation error measuring instrument and rotating shaft is also show in Fig. 1, the conventional peripheral circuit of FPGA comprises clock circuit and JTAG download circuit, the conventional peripheral circuit of DSP comprises clock circuit and JTAG download circuit, and DSP is also connected with hard disk by ata interface.

As shown in Figure 2, described capacitance gage is six, six described capacitance gages are arranged on the outside support of described main shaft, the outside support of main shaft comprises the axle sleeve 1 of outside hollow cylinder structure and the air supporting support 2 of inner hollow cylinder structure, and its sagittal plane 3 is the cross section of main shaft; Select two section S 1 of main shaft, S2 as spindle rotation error tested object, three capacitance gages are arranged respectively around two section S 1, S2 of main shaft, namely, capacitance gage S11, S12, S13 is arranged in the section S 1 of main shaft, capacitance gage S21, S22, S23 is arranged, three opposing parallel installations of capacitance gage S21, S22, S23 in three capacitance gages S11, S12, S13 in section S 1 and section S 2 in the section S 2 of main shaft; Correspondingly, described A/D circuit is 24,6 tunnel A/D circuit.

Be specifically described below in conjunction with the course of work of accompanying drawing to this portable spindle rotation error measuring instrument, the measuring method content wherein related to, only in order to practicality and the exploitativeness of this measuring instrument are described, is not the technical scheme of the utility model protection:

As shown in Figure 2, Errors in Radial Rotation Error of Spindle e adopts double sections three point method to test, distance between section S 1 and top section is l1, distance between section S 2 and section S 1 is l2, wherein two sections S1, the capacitance gage circumferentially that S2 is corresponding angularly gathers N=1600 data in each cross section when testing, by S11, S12, the Radial mixing signal of S13 tri-dial gauge test signals after main shaft roundness error separation is e1 (i) (i=1, 2..N), by S21, S22, the Radial mixing signal of S23 tri-dial gauge test signals after roundness error separation is e2 (i) (i=1, 2..N), then the Errors in Radial Rotation Error of Spindle in S0 cross section to be measured is at X, component Δ x (i) in Y-direction, Δ y (i) and wobble error Δ θ x (i), Δ θ y (i) is respectively:

$\mathrm{\Δx}\left(i\right)=(1+\frac{l_1}{l_2})e_1\cos (2\mathrm{\πi}/N)-\frac{l_1}{l_2}{e}_2\cos (2\mathrm{\πi}/N)$

$\mathrm{\Δy}\left(i\right)=(1+\frac{l_1}{l_2})e_1\sin (2\mathrm{\πi}/N)-\frac{l_1}{l_2}{e}_2\sin (2\mathrm{\πi}/N)$

$\mathrm{\Δ}{\mathrm{\θ}}_x\left(i\right)=\frac{(e_2\left(i\right)-e_1\left(i\right))\×\sin (i\×2\mathrm{\π}/N)}{l_2}$

$\mathrm{\Δ}{\mathrm{\θ}}_y\left(i\right)=\frac{(e_2\left(i\right)-e_1\left(i\right))\×\cos (i\×2\mathrm{\π}/N)}{l_2}$

As shown in Figure 1, data acquisition and processing (DAP) has been worked in coordination with by FPGA and DSP, and realize man-machine interaction in the mode of touch-screen, user arranges parameters by touch-screen, first DSP wakes FPGA up by corresponding GPIO mouth, then the parameter that user is arranged is transferred to FPGA by wherein EMIF, after FPGA detects air spindle stabilization of speed, control A/D circuit is set according to user and carries out data acquisition, and collection result is transferred to DSP with dma mode, after collection terminates, end mark is transferred to DSP by GPIO, after DSP receives and gathers end mark, employing is carried out subsequent analysis process to data and is isolated turn error and error of tilt, be shown to graphically on touch-screen.

For realizing accurate assignment test, in hardware design, application is arranged on the Z-direction pulse signal of the increment type grating scale output on main shaft to testing weekly zero data location, by Z narrow pulse signal be transformation period the square-wave signal Zt of air spindle rotation period twice by signal broadening circuit, and Zt signal is introduced FPGA, as the initial trigger collection signal under stabilized (steady-state) speed ω, after FPGA receives the stabilization of speed signal sent from main shaft self knotmeter, start sampling at the rising edge of Zt pulse.The signal of six capacitance gages is by exporting six tunnel 0 ~ 10V signal access A/D circuit samplings after six road signal conditioning circuits, A/D circuit carries out signal synchronous collection under the control of FPGA.Counting module in FPGA is used for the rotation week counting number to air spindle under stabilized (steady-state) speed ω, respectively at rising edge and the negative edge counting of Zt signal, the all numbers triggering rear collection are obtained by two counter combinatorial operations, when all numbers of the collection set are identical with all numbers of actual measurement, stop data acquisition, DSP performs subsequent data analysis and process.

In foregoing, FPGA is field programmable gate array; DSP is digital signal processor; A/D circuit is analog to digital conversion circuit.

Above-described embodiment is preferred embodiment of the present utility model; it is not the restriction to technical solutions of the utility model; as long as without the technical scheme that creative work can realize on the basis of above-described embodiment, all should be considered as falling within the scope of the rights protection of the utility model patent.

Claims (2)

1. a portable spindle rotation error measuring instrument, it is characterized in that: comprise FPGA, DSP, signal broadening circuit, capacitance gage, signal conditioning circuit, A/D circuit and touch-screen, the input end input of described signal broadening circuit is arranged on the grating Z pulse signal of the increment type grating scale output on described main shaft, the signal output part of described capacitance gage is connected with the input end of described signal conditioning circuit, the output terminal of described signal conditioning circuit is connected with the input end of described A/D circuit, the output terminal of described A/D circuit is connected with the output terminal of described signal broadening circuit is corresponding with the signal input part of described FPGA respectively, described FPGA and described touch-screen are corresponding with described DSP to be respectively connected.

2. portable spindle rotation error measuring instrument according to claim 1, it is characterized in that: described capacitance gage is six, six described capacitance gages are arranged on the outside support of described main shaft, three described capacitance gages are arranged respectively, the opposing parallel installation of described capacitance gage circumferentially that wherein two described cross sections are corresponding around two cross sections of described main shaft; Described A/D circuit is 24,6 tunnel A/D circuit.