CN103604369A

CN103604369A - Data collection system of articulated-type laser scanning coordinate measuring machine

Info

Publication number: CN103604369A
Application number: CN201310606011.XA
Authority: CN
Inventors: 潘勇; 曾悠兵; 赵克勤; 龚海华; 王吴雨; 王小梅
Original assignee: Jiujiang Precision Measuring Technology Research Institute
Current assignee: Jiujiang Precision Measuring Technology Research Institute
Priority date: 2013-11-26
Filing date: 2013-11-26
Publication date: 2014-02-26

Abstract

The invention provides a data collection system of an articulated-type laser scanning coordinate measuring machine. The data collection system comprises four circuit boards, namely, the base board, the first relay board, the second relay board and the measuring head board, wherein all the boards are connected with one another through conductive slip rings. The four circuit boards are used for collecting raster data of corresponding articulations respectively, converting the raster data into angle data and latching the collected raster data according to the state of a button B1 of a measuring head and the state of a button B2 of the measuring head, wherein the button B1 is used for carrying out contact measurement, and the button B2 is used for carrying out scanning measurement; the data are transmitted between the circuit boards and an upper computer through the Bluetooth or a USB, and data are transmitted between a scanning head and the upper computer through a USB. The data collection system is applied to the articulated-type coordinate measuring machine with the laser scanning function, achieves data synchronism between the scanning head and the measuring machine and makes the measuring machine capable of carrying out measurement through the contact-type measuring head as well as the scanning head.

Description

A kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS)

Technical field

The present invention relates to a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS).

Background technology

Articulated arm coordinate measuring machine is a kind of novel nonopiate formula coordinate measuring machine, articulated arm coordinate measuring machine consists of a plurality of joints, on the joint of mechanical arm, angular transducer is housed, can measure in real time the rotational angle in joint, according to the rotational angle in brachium and each joint, calculate the three-dimensional coordinate of the contact measuring head of measuring machine end.Articulated type coordinate measuring machine also can be installed 3 D laser scanning head, and scanner head is fixedly mounted on the end of joint measurment machine, can realize the scanning survey to workpiece, is applied to the fields such as reverse-engineering.Compare with orthogonal formula coordinate measuring machine, that articulated arm coordinate measuring machine has is simple in structure, volume is little, lightweight, measurement range large, the feature such as light flexibly, and can be used for in-site measurement, and can solve easily conventional orthogonal coordinate measuring machine and be difficult to the problem solving, for example measurement to mould, mechanical component product.

Ling Qingping and Liu Shugui from University Of Tianjin have proposed a kind of data acquisition plan based on CPLD, single-chip microcomputer and conducting slip ring in the research > > of document < < articulated arm coordinate measuring machine data acquisition system (DAS), two processors (CPLD and single-chip microcomputer) have been adopted, power consumption is large, and the volume of circuit board is large.

Patent < < articulated arm coordinate measuring machine is with having proposed a kind of data acquisition plan based on FPGA and conducting slip ring in data acquisition and transmission system > >.Adopt FPGA processor speed slow; Adopt the transmission speed of RS232 slow, a little less than antijamming capability.

Summary of the invention

Its object of the present invention is just to provide a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS), be applied to the articulated type coordinate measuring machine with scan function, solved the data synchronization problems of scanner head and measuring machine, make measuring machine measure and also can carry out scanning survey with scanner head with contact measuring head, take that CPLD is core processor, can decode to multi-channel Grating sensor signal, can realize three-dimensional scanning measurement, realize the system of real-time data transmission function.

The technical scheme that realizes above-mentioned purpose and take, comprise bedplate, a joint, No. two joints, a relay plate, No. three joints, No. five joints, No. four joints, No. two relay plates, No. six joints, gauge head plate, scanner head, described No. six joints, between scanner head, be provided with gauge head plate, No. five joints, between No. four joints, be provided with No. two relay plate, No. two joints, between No. three joints, be provided with No. one relay plate, described bedplate, a relay plate, No. two relay plates, between gauge head plate, pass through RS485 bus communication, between plate, interconnected wire connects through conducting slip ring, described gauge head plate connects button B1, B2.

beneficial effect

compared with prior art the present invention has the following advantages.

1, three circuit boards except bedplate all adopt the design of uniprocessor CPLD but not two processors (CPLD and single-chip microcomputer) design the volume that has reduced power consumption and dwindled circuit board like this, and what the volume of whole machine also can be done simultaneously is less;

2, adopt CPLD as processor, its processing speed is faster and have a larger time predictability than FPGA more;

3, adopt RS485 as communications protocol, than the transmission speed of RS232 is faster, antijamming capability is stronger;

4, the communication modes of coordinate measuring machine and host computer both can select the USB transmission mode of data line also can select wireless Bluetooth transmission mode;

5, can join scanning feeler and measure.

Accompanying drawing explanation

below in conjunction with accompanying drawing, the invention will be further described.

Fig. 1 is the structural representation of native system;

Fig. 2 is data acquisition system (DAS) principle schematic in native system;

Fig. 3 is the bedplate principle schematic in native system;

Fig. 4 is a relay plate principle schematic in native system;

Fig. 5 is No. two relay plate principle schematic in native system;

Fig. 6 is the gauge head plate principle schematic in native system.

Embodiment

Comprise bedplate 1, a joint 2, No. two joints 3, a relay plate 4, No. three joints 5, No. five joints 6, No. four joints 8, No. two relay plates 7, No. six joints 9, gauge head plate 10, scanner head 11, as shown in Figure 1, described No. six joints 9, between scanner head 11, be provided with gauge head plate 10, No. five joints 6, between No. four joints 8, be provided with No. two relay plate 7, No. two joints 3, between No. three joints 5, be provided with No. one relay plate 4, described bedplate 1, a relay plate 4, No. two relay plates 7, between gauge head plate 10, pass through RS485 bus communication, between plate, interconnected wire connects through conducting slip ring, described gauge head plate 10 connects button B1, B2, as shown in Figure 2.

Described bedplate 1 comprises CPLD processor, RS485 level switch module, USB module, grating signal modular converter, bluetooth module, power module and single-chip microcomputer, as shown in Figure 3, bedplate 1 input end connects read head 1, and output terminal connects host computer, a relay plate 4.

A described relay plate 4 comprises CPLD processor, RS485 level switch module, grating signal modular converter, power module, as shown in Figure 4, No. one relay plate 4 input ends connect read head 1, read head 2, and a described relay plate 4 output terminals connect No. two relay plates 7.

Described gauge head plate 10 comprises CPLD processor, RS485 level switch module, grating signal modular converter, power module, as shown in Figure 6.

Described RS485 level switch module adopts MAX485 chip, realizes and converts the differential signal of RS485 to Transistor-Transistor Logic level.

Described scanner head (11) adopts the nxSensor series lines laser scanning head of U.S. NextWare company.

Described bluetooth module adopts the BC417 Bluetooth chip of CSR company.

Described USB module adopts PDIUSBD12 chip.

Example example

As shown in Figure 1, comprise four circuit boards: bedplate, relay plate, No. two relay plates and gauge head plate.Whole system is powered by external dc power, the 12V direct supply of outside input is connected with the supply socket of bedplate, process power module transfers 5V to and 3.3V exports to relay plate No. one, wherein 5V power lead is supplied with other three circuit boards through slip ring, transfers separately 3.3V when each circuit board needs 3.3V to again.Four circuit boards are placed on respectively in 4 cavitys, and between plate, communication wire connects to prevent that through conducting slip ring joint from twisting off wire while rotating.

As shown in Figure 2, four circuit boards connect 6 grating reading heads, and bedplate is respectively connected 1 read head with gauge head plate, and 1 relay plate is respectively connected two read heads with 2 relay plates.Line between plate and plate comprises: receive/signalling of power lead, ground wire, RS485 line, button Bl signal wire, button B2 signal wire be totally 6 routes.

As shown in Figure 3, bedplate is comprised of CPLD processor, RS485 level switch module, USB module, grating signal modular converter, bluetooth module, power module and single-chip microcomputer seven parts.Bedplate is realized data communication by USB mouth or bluetooth module and host computer; Bedplate is connected by grating interface same grating reading head, Real-time Collection angle-data; Bedplate is connected by conducting slip ring same relay plate, and relay plate provides power supply for No. one; The measurement data that bedplate is sent by relay plate of RS485 interface reception.

As shown in Figure 4, a relay plate is comprised of CPLD processor, RS485 level switch module, grating signal modular converter and power module four parts.No. one relay plate is connected with No. two, No. three two grating reading heads by grating interface, Real-time Collection angle-data; Relay plate is connected with No. two relay plates by conducting slip ring, and relay plate provides power supply for No. two; Relay plate receives by RS485 interface the measurement data that No. two relay plates return; No. one relay plate sends measurement data by RS485 interface to bedplate.

As shown in Figure 5, No. two relay plates are identical with a relay plate structure.No. two relay plate is connected with No. four, No. five two grating reading heads by grating interface, Real-time Collection angle-data; No. two relay plate is connected with gauge head plate by conducting slip ring, for gauge head plate provides power supply; By RS485 interface, receive the measurement data that gauge head plate returns; By RS485 interface, to a relay plate, send measurement data.

As shown in Figure 6, gauge head plate is comprised of CPLD processor, RS485 level switch module, grating signal modular converter and power module four parts; Gauge head plate is connected with No. six grating reading heads by grating interface, Real-time Collection angle-data; Gauge head plate sends measurement data to No. two relay plates by RS485 interface.Gauge head plate receives switching signal Bl and the B2 of gauge head.

First connect outside 12V direct supply, bedplate transfers power supply 5V to and is transferred to other three circuit boards by conducting slip ring, and each circuit board converts 5V to by power module 3. 3V and the 1. 2V voltages that need separately.Rear four circuit boards of switching on start simultaneously, start the output signal of each grating reading head of Real-time Collection, and convert angle-data to.

When not having button to press, gauge head plate triggers all circuit boards every 100ms and gathers raster data, data from gauge head plate step by step to plank transmission below, by bedplate, gathered by issuing host computer by bluetooth module or USB module, now issue the Frame of host computer with character " T " beginning, so just realized the real-time update of joint measurment machine data.

Button B1 measures for common contact measuring head, and when it is pressed, four circuit boards are triggered simultaneously and gather raster data; Data pass step by step from gauge head plate, finally by bedplate, through bluetooth module or USB, issue host computer, and the data of now issuing host computer start with character " P ".

Button B2 is for scanning survey, when it is pressed, except four circuit boards be triggered and image data scanner head be also triggered simultaneously and scan frame data, data are temporarily stored in scanner head; Host computer reads immediately scan-data after receiving raster data, and two data are synchronization collection, through computing, scan-data can be transformed under global coordinate system.The data that bedplate is now issued host computer start with character " S ".

Claims

1. an articulated type laser scanning coordinate measuring machine data acquisition system (DAS), comprise bedplate (1), a joint (2), No. two joints (3), a relay plate (4), No. three joints (5), No. five joints (6), No. four joints (8), No. two relay plates (7), No. six joints (9), gauge head plate (10), scanner head (11), it is characterized in that, described No. six joints (9), between scanner head (11), be provided with gauge head plate (10), No. five joints (6), between No. four joints (8), be provided with No. two relay plates (7), No. two joints (3), between No. three joints (5), be provided with a relay plate (4), described bedplate (1), a relay plate (4), No. two relay plates (7), between gauge head plate (10), pass through RS485 bus communication, between plate, interconnected wire connects through conducting slip ring, described gauge head plate (10) connects button B1, B2.

2. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, it is characterized in that, described bedplate (1) comprises CPLD processor, RS485 level switch module, USB module, grating signal modular converter, bluetooth module, power module and single-chip microcomputer, bedplate (1) input end connects read head 1, and output terminal connects host computer, a relay plate (4).

3. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, it is characterized in that, a described relay plate (4) comprises CPLD processor, RS485 level switch module, grating signal modular converter, power module, a relay plate (4) input end connects read head 1, read head 2, and a described relay plate (4) output terminal connects No. two relay plates (7).

4. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, is characterized in that, described gauge head plate (10) comprises CPLD processor, RS485 level switch module, grating signal modular converter, power module.

5. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, is characterized in that, described RS485 level switch module adopts MAX485 chip, realizes and converts the differential signal of RS485 to Transistor-Transistor Logic level.

6. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, is characterized in that, described scanner head (11) adopts the nxSensor series lines laser scanning head of U.S. NextWare company.

7. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, is characterized in that, described bluetooth module adopts the BC417 Bluetooth chip of CSR company.

8. a kind of articulated type laser scanning coordinate measuring machine data acquisition system (DAS) according to claim 1, is characterized in that, described USB module adopts PDIUSBD12 chip.