CN102645182B - Surface profile scanning type workpiece precut part weighing device - Google Patents

Abstract

The invention relates to a surface profile scanning type workpiece precut part weighing device. The practicability of the existing device is not high and the accuracy is comparatively low. The surface profile scanning type workpiece precut part weighing device comprises a digital controller, laser displacement sensors, a scanning stepping motor, a feeding stepping motor, supports and a feeding table. The laser displacement sensors are installed on the supports on the two sides of a workpiece and are driven by the scanning stepping motor. The moving direction of the scanning stepping motor is in parallel with the longitudinal section of the workpiece. The feeding table is driven by the feeding stepping motor and is used for feeding the workpiece. The laser displacement sensors, the scanning stepping motor and the feeding stepping motor are connected with the digital controller through signals. The surface profile scanning type workpiece precut part weighing device has the advantages that the workpiece is not damaged and the long-term measurement is facilitated; by adopting a laser ranging technique, the speed is fast, the efficiency is high, the requirement on the environment is not strict and the measurement under all kinds of working conditions is facilitated; and the structure of the device is simple and the accuracy is higher than the accuracy of manual measurement.

Description

Surface profile scan-type workpiece intercepts part weighing device in advance

Technical field

The present invention relates to a kind of workpiece and intercept in advance part weighing device, particularly a kind of workpiece of surface profile scan rebuilding that adopts intercepts weighing device partly in advance.

Background technology

In some field of industrial processes, workpiece to be processed requires to meet certain requirement in weight, such as in 3%, this just requires to increase the device of judgement workpiece weight before processing work.The workpiece of rule is generally cylindrical, and weight at this moment requires to guarantee according to Workpiece length, for the workpiece of irregular size, how to guarantee that the workpiece weight of cutting meets the requirements, and key is how to measure the volume of irregularly shaped object.

Due to the scrambling of cutting material, the volume that how to obtain cutting material is also a difficult problem.Volume measuring method mainly contains two kinds of contact type measurement method and non-contact type measuring methods.Contact type measurement has manual measurement and the measurement based on Archimedes principle, and manual measurement workload is large, and input human and material resources are more, practicality is very poor, and precision is also lower.The volume measuring instrument of the patent arbitrary shape workpiece of publication number CN1423111, based on Archimedes principle, utilizes the weight that object alleviates in water to equal the weight that object arranges consubstantiality ponding.Non-cpntact measurement has image measurement method and laser imaging method.A kind of volume measurement device and measuring method thereof based on image of patent of publication number CN101266131 is based on image measurement method, utilizes three cameras being arranged on objective table to record the three-dimensional data of testee, then obtains the actual volume of testee.The cubing error of image measurement method is larger, is not suitable for being applied to the higher occasion of accuracy requirement, and cost is also higher, is not suitable for the widespread use on band sawing machine.Adopt laser displacement sensor, by measuring irregularly shaped object cross-sectional area, carry out volume calculated, realize simply, can well realize accuracy requirement.

Summary of the invention

The object of the present invention is to provide a kind of accurate weighing device that workpiece is intercepted in advance to part; Be that a kind of to obtain two-dimensional section long-pending by surface of the work section of outline direction being carried out from top to bottom to line area accumulation, then workpiece feedstock direction carried out to the long-pending measurement mechanism that obtains 3 D workpiece quality of two-dimensional section accumulation; A kind of integrated workpiece profile twice one dimension laser ranging in surface, the non-contact measurement apparatus of upper and lower stepper drive and charging stepper drive.

The technical scheme that technical solution problem of the present invention adopts is:

Surface profile scan-type workpiece intercepts in advance part weighing device and comprises digital controller, laser displacement sensor, scanning stepper motor, feeding stepper motor, support and feeding table.On the support of the both sides of workpiece, laser displacement sensor is housed, laser displacement sensor drives by scanning stepper motor, and the direction of motion of scanning stepper motor is parallel with workpiece longitudinal section; Feeding table is driven by feeding stepper motor, for feeding workpiece; Laser displacement sensor, scanning stepper motor is all connected with digital controller signal with feeding stepper motor.

Beneficial effect of the present invention: laser ranging technique, as a kind of contactless detection technique, can not cause damage to workpiece, is beneficial to permanent measurement; Laser ranging technique speed is fast, and efficiency is high, not strict to environmental requirement, is conducive to the measurement under various operating modes; Apparatus structure is simple, than manual measurement, has higher degree of accuracy.According to the observation of actual sawing process and analysis, adopt the existing two-dimentional workpiece scanning system in market, price is very expensive first, second detect workpiece size scope also relatively limited (diameter is less than 100mm), therefore, adopt the laser distance measuring principle of one dimension, the dynamic scan pattern that coordinates xy shaft type to drive, set up the three-dimensional dimension model of pre-intercepting part, thereby obtain weight prediction.

Accompanying drawing explanation

Fig. 1 is weighing device three-dimensional plot;

Fig. 2 is weighing device system composition diagram;

Fig. 3 is that weighing device is controlled schematic diagram calculation;

In figure: 1. scan stepper motor; 2. slide rail; 3. slide rail base; 4. slide block; 5. laser pick-off window; 6. Laser emission window; 7. workpiece; 8. laser displacement sensor; 9. feeding stepper motor; 10. reducer casing; 11. head rolls; 12. screw mandrels.

Embodiment

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

As shown in Figure 1, the present invention adopts the mode of surface profile scanning, and specific implementation adopts two laser displacement sensors 8 to scan respectively the left and right contoured surface of workpiece 7.Slide rail base 3 is arranged on respectively the both sides of feeding table.Laser displacement sensor 8 is bolted on slide block 4, slide block 4 is arranged on slide rail 2, forms two moving sets with slide rail 2, and slide rail 2 is fixed on slide rail base 3, in the middle of two slide rails 2, leading screw 12 is housed, the rotating shaft of scanning stepper motor 1 is directly connected with leading screw 12.Screw mandrel 12 is connected with slide block 4 by ball screw assembly.The direction of motion of scanning stepper motor 1 is parallel with workpiece 7 longitudinal sections.Laser displacement sensor 8 is driven by scanning stepper motor 1, translational speed at the uniform velocity, facilitate laser displacement sensor 8 equidistantly to sample, laser ranging adopts triangulation, Laser emission window 6 Emission Lasers are to workpiece 7, laser pick-off window 5 is surveyed the laser bright spot on workpiece 7 and is calculated laser bright spot to the distance of laser displacement sensor 8, and Laser emission window 6, laser bright spot and laser pick-off window 5 have formed Delta Region.Advancing of workpiece 7 driven by head roll 11, and head roll 11 is connected with reducer casing 10, and reducer casing 10 is connected with feeding stepper motor 9, and reducer casing 10 provides and underspeeded, and increases the function of moment of torsion.When laser displacement sensor 8 scans, feeding stepper motor 9 must stop, feeding stepper motor 9 segment distance that readvances after laser displacement sensor 8 completes single pass.

As shown in Figure 2, digital controller is the core of system, is responsible for all computings.Laser displacement sensor, scanning stepper motor is all connected with digital controller signal with feeding stepper motor.Digital controller on the one hand gating pulse sends stepper drive signal to feeding stepper motor 9, feeding stepper motor 9 is moved on feed direction, after each feeding 1mm, stop, concrete feed distance can be according to realistic accuracy adjustment, after feeding stepper motor 9 stops, digital controller gating pulse sends stepper drive signal to scanning stepper motor 1, driven sweep stepper motor 1 at the uniform velocity moves up and down, drive the equidistantly exterior contour of sampling workpiece 7 of laser displacement sensor 8, the rear feeding stepper motor 9 of the having sampled 1mm that readvances.After each stepper drive, scanning stepper motor and feeding stepper motor all can the step-by-step countings to digital controller by encoder feedback.Digital controller is connected with laser displacement sensor 8 on the other hand, receives in real time the data that laser displacement sensor 8 collects.The concrete Computing Principle of device is as described below: left and right airborne laser range finder spacing is l, left side viameter records distance (distance that viameter is ordered from A on workpiece) l _y1, right side viameter records distance (distance that viameter is ordered from B on workpiece) l _y2, sustained height both sides, the workpiece cross section AB distance in a certain moment l _ycan be obtained by following formula:

Like this, the workpiece area of section in a certain moment s( i) can obtain by the axial little rectangular area integration stack of y, specifically can be expressed as:

In formula, mnumber of times for y orientation measurement; Dy is the each feeding distance of scanning stepper motor. for xin direction iinferior measurement, in y direction jthe distance value of inferior measurement.Therefore, the workpiece weight G of pre-intercepting part is

In formula nfor xthe number of times of orientation measurement; dxfor the each feeding distance of charging stepper motor; ρfor workpiece density.

As shown in Figure 3, how weighing device control principle drawing, under the coordination of digital controller, complete synchronous that feeding and workpiece 7 outlines obtain.During beginning, can be by the information of the relevant weighing device of digital controller be set, comprise workpiece 7 density, predetermined weight, sweep interval, feeding step distance etc., after arranging, the information of completing carries out the zero clearing of initialization and weight, then digital controller control feeding stepper motor 9 advances workpiece 7, workpiece 7 advances after 1mm and stops, digital controller gated sweep stepper motor 1 moves up and down, thereby laser displacement sensor 8 is uniformly-spaced sampled to workpiece 7 profiles, rear calculating workpiece 7 sectional areas sectional area is cumulative of having sampled, when cumulative weight reaches regulation requirement, digital controller provides signal this part workpiece is cut, cut rear data zero clearing and carried out weight next time and calculate.

Claims (2)

1. surface profile scan-type workpiece intercepts part weighing device in advance, comprise digital controller, laser displacement sensor, scanning stepper motor, feeding stepper motor, support and feeding table are equipped with laser displacement sensor on the support of the both sides of workpiece, laser displacement sensor drives by scanning stepper motor, and the direction of motion of scanning stepper motor is parallel with workpiece longitudinal section; Feeding table is driven by feeding stepper motor, for feeding workpiece; Laser displacement sensor, scanning stepper motor is all connected with digital controller signal with feeding stepper motor; It is characterized in that:

Digital controller on the one hand gating pulse sends stepper drive signal to feeding stepper motor, feeding stepper motor is moved on feed direction, after each feeding 1mm, stop, after feeding stepper motor stops, digital controller gating pulse sends stepper drive signal to scanning stepper motor, driven sweep stepper motor at the uniform velocity moves up and down, and drives equidistantly the sample exterior contour of workpiece of laser displacement sensor, the rear feeding stepper motor of the having sampled 1mm that readvances; After each stepper drive, scanning stepper motor and feeding stepper motor all can the step-by-step countings to digital controller by encoder feedback; Digital controller receives the data that laser displacement sensor collects on the other hand in real time;

If two laser displacement sensor spacing are L, a side laser displacement sensor records distance for l _y1, right opposite side laser displacement sensor records distance for l _y2, the workpiece cross section sustained height two lateral extent l in a certain moment _yby following formula, obtained:

l _y=L-l _y1-l _y2

Like this, the workpiece area of section S (i) in a certain moment obtains by the axial little rectangular area integration stack of y, specifically can be expressed as:

$S\left(i\right)=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{l}_y(i,j)\mathrm{dy}$

In formula, m is the number of times of y orientation measurement; Dy is the each feeding distance of scanning stepper motor; l _y(i, j) measures for the i time in x direction, the distance value that in y direction, the j time is measured; Therefore, the workpiece weight G of pre-intercepting part is:

$G=\mathrm{\ρ}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}S\left(i\right)\mathrm{dx}=\mathrm{\ρ}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{l}_y(i,j)\mathrm{dydx}$

In formula, n is the number of times of x orientation measurement; Dx is the each feeding distance of charging stepper motor; ρ is workpiece density.

2. surface profile scan-type workpiece according to claim 1 intercepts part weighing device in advance, it is characterized in that: described support comprises slide rail base, slide rail, slide block and screw mandrel, slide rail is arranged on slide rail base, slide block is arranged on slide rail, and screw mandrel is arranged in the middle of two slide rails, is connected with slide block; Described laser displacement sensor is arranged on described slide block.