CN106643935B

CN106643935B - Laser scattering multi-elevation sand transmission intensity synchronous measurement device

Info

Publication number: CN106643935B
Application number: CN201611102856.5A
Authority: CN
Inventors: 张静红; 邱成春; 李柯秀
Original assignee: Yancheng Institute of Technology
Current assignee: Yancheng Institute of Technology
Priority date: 2016-12-05
Filing date: 2016-12-05
Publication date: 2023-10-17
Anticipated expiration: 2036-12-05
Also published as: CN106643935A

Abstract

The invention discloses a laser scattering multi-elevation sand conveying intensity synchronous measuring device, which comprises a plurality of sand collecting pipes, a protection box, a collecting tank and a signal processor, wherein the collecting tank is arranged at the bottom of the protection box; the invention adopts a non-contact measurement mode, and does not cause interference to the sand particle flow to be measured; the scattered light energy captures sand information of each particle size, so that the measurement accuracy is high; the time series measurement of the sand conveying intensity at different heights in a short time can be realized, and the measurement result can be used for analyzing the researches of the space-time structure of the sand flow, the change rule of the instantaneous sand conveying intensity along with the height and the like.

Description

Laser scattering multi-elevation sand transmission intensity synchronous measurement device

Technical Field

The invention relates to a sand conveying measurement device.

Background

In field sand blasting measurement, especially in observation and research of transient sand blasting flux, an acquisition instrument comprises a force transducer, a particle collision sensor (saliphone, sense, safire), an optical measurement device (such as LDA, PIV) and the like, but these measurement devices can only measure the sand transportation intensity of a local area at a certain height or can only measure the sand transportation rate on the whole section, and cannot obtain synchronous measurement results of the sand transportation intensity of different heights, which results in that the distribution characteristics of the transient sand transportation flux along the height and the change of the transient sand transportation flux along with time can not be explored up to now.

Disclosure of Invention

The invention aims at: aiming at the defect that the existing sand conveying rate measuring device can only carry out single-point or section measurement, the experimental device capable of synchronously measuring the sand conveying intensity of different heights is provided.

The technical scheme of the invention is as follows: the utility model provides a synchronous measuring device of many elevations of laser scattering sand transmission intensity, including many sand collecting tubes, the guard box, the collecting vat of setting in the guard box bottom, and signal processor, the sand inlet of a plurality of sand collecting tubes sets up in different altitudes, and sand collecting tube lower part stretches into the guard box and links to each other with the collecting vat, the position of each sand collecting tube of corresponding in the guard box is equipped with corresponding laser respectively, light information receiver and photoelectric converter, photoelectric converter and signal connection of signal processor, be equipped with the vacuum pump in the guard box and with external communicating blast pipe, during the operational state, the vacuum pump discharges the inside part air of guard box through the blast pipe, make the guard box in form negative pressure, the sand grain of external different altitudes is by inhaling corresponding sand collecting tube respectively, diffraction and scattering take place after the sand grain in the sand collecting tube meets the laser emission in the guard box, light information receiver receives the information and passes signal processor through photoelectric converter and converts into required mass concentration information.

Preferably, the sand collecting pipe is sequentially divided into a sand inlet section, an inclined pipe section, a straight pipe section and a laser sand measuring section positioned in the protection box from top to bottom. The straight pipe section of the sand collecting pipe is partially provided with a metal hose, and two ends of the metal hose are respectively connected and fixed with the straight pipe section of the sand collecting pipe through fixing nuts. 15 sand collecting pipes are arranged, and the sand inlet section is a stainless steel circular pipe with the outer diameter of 20mm and the inner diameter of 18 mm.

Preferably, the device further comprises a fixing rod, and the sand inlet sections of the sand collecting pipes are respectively connected with the fixing rod.

The principle of measuring particle size distribution by a laser is as follows: monochromatic light emitted by the laser is converted into parallel light of plane waves through an optical path, the parallel light is emitted to a light-transmitting sample cell in the middle of the optical path, particles with different sizes dispersed in a dispersion medium are subjected to diffraction and scattering at different angles when meeting light, the light generated after the diffraction and scattering is emitted to light information receivers (detectors) arranged in different directions, and the information of diffraction and scattering conversion is transmitted to a microcomputer through a photoelectric converter for processing and is converted into distribution information of particles.

The invention has the advantages that:

1. the invention adopts a non-contact measurement mode, and does not cause interference to the sand particle flow to be measured; the scattered light energy captures sand information of each particle size, so that the measurement accuracy is high; the time series measurement of the sand conveying intensity at different heights in a short time can be realized, and the measurement result can be used for analyzing the researches of the space-time structure of the sand flow, the change rule of the instantaneous sand conveying intensity along with the height and the like.

2. The metal hose is arranged in the straight pipe section of the sand collecting pipe, so that the deformation and damage of the device can be effectively prevented.

Drawings

The invention is further described below with reference to the accompanying drawings and examples:

FIG. 1 is a schematic side view of the present invention;

fig. 2 is a schematic top view of the present invention.

Wherein: 1, a sand collecting pipe; 11 sand inlet; 12 sand feeding sections; 13 inclined tube sections; 14 straight pipe sections; 15, a laser sand measuring section; 16 a metal hose; 17 fixing screw cap

2, protecting the box;

3, collecting a tank;

4, a signal processor;

5 a laser;

6 an optical information receiver;

7 a photoelectric converter;

8, a vacuum pump;

9, an exhaust pipe;

10 fixing the rod.

Detailed Description

Examples: as shown in fig. 1 and 2, a laser scattering multi-elevation sand-conveying intensity synchronous measuring device comprises a plurality of sand collecting pipes 1, a protection box 2, a collecting tank 3 arranged at the bottom of the protection box 2 and a signal processor 4, sand inlets 11 of the sand collecting pipes 1 are arranged at different heights, the lower parts of the sand collecting pipes 1 extend into the protection box 2 and are connected with the collecting tank 3, corresponding lasers 5, optical information receivers 6 and photoelectric converters 7 are respectively arranged in the protection box 2 corresponding to the positions of the sand collecting pipes 1, the photoelectric converters 7 are in signal connection with the signal processor 4, and a vacuum pump 8 and an exhaust pipe 9 communicated with the outside are arranged in the protection box 2.

In this embodiment, the sand collecting pipe 1 is sequentially divided into a sand inlet section 12, an inclined pipe section 13, a straight pipe section 14 and a laser sand measuring section 15 located in the protection box 2 from top to bottom. 15 sand collecting pipes 1, and the sand inlet section 12 is a stainless steel circular pipe with the outer diameter of 20mm and the inner diameter of 18mm, and can measure the sand conveying intensity of different heights within the range of 300mm from the ground surface.

In this embodiment, the straight tube section 14 of the sand collecting tube 1 is partially provided with a metal hose 16, and two ends of the metal hose 16 are respectively connected and fixed with the straight tube section 14 of the sand collecting tube 1 through fixing nuts 17. The arrangement of the metal hose can effectively prevent the deformation and damage of the device.

In this embodiment, the device further comprises a fixing rod 10, and the sand inlet sections 12 of the sand collecting pipes 1 are respectively connected with the fixing rod 10. The fixed rod may be used to limit the rotation and movement of the device.

When the invention is in a working state, the vacuum pump 8 discharges partial air in the protection box 2 through the exhaust pipe 9, so that negative pressure is formed in the protection box 2, sand grains with different external heights are respectively sucked into the corresponding sand collecting pipes 1, the sand grains in the sand collecting pipes 1 in the protection box 2 are diffracted and scattered after meeting laser light emitted by the laser 5, and the light information receiver 6 receives information and transmits the information to the signal processor 4 through the photoelectric converter 7 to be converted into needed mass concentration information.

The invention adopts a non-contact measurement mode, and does not cause interference to the sand particle flow to be measured; the scattered light energy captures sand information of each particle size, so that the measurement accuracy is high; the time series measurement of the sand conveying intensity at different heights in a short time can be realized, and the measurement result can be used for analyzing the researches of the space-time structure of the sand flow, the change rule of the instantaneous sand conveying intensity along with the height and the like.

The foregoing is merely a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the scope of the invention.

Claims

1. A laser scattering multi-elevation sand transmission intensity synchronous measurement device is characterized in that: the sand collecting device comprises a plurality of sand collecting pipes (1), a protection box (2), a collecting tank (3) arranged at the bottom of the protection box (2) and a signal processor (4), wherein sand inlet openings (11) of the sand collecting pipes (1) are arranged at different heights, the lower parts of the sand collecting pipes (1) extend into the protection box (2) and are connected with the collecting tank (3), corresponding lasers (5), optical information receivers (6) and photoelectric converters (7) are respectively arranged in the protection box (2) at positions corresponding to the sand collecting pipes (1), the photoelectric converters (7) are in signal connection with the signal processor (4), a vacuum pump (8) and an exhaust pipe (9) communicated with the outside are arranged in the protection box (2), and the sand collecting pipes (1) are sequentially divided into a sand inlet section (12), an inclined pipe section (13), a straight pipe section (14) and a laser sand measuring section (15) positioned in the protection box (2) from top to bottom; the sand collecting pipe is characterized in that the straight pipe section (14) of the sand collecting pipe (1) is partially provided with a metal hose (16), and two ends of the metal hose (16) are respectively connected and fixed with the straight pipe section (14) of the sand collecting pipe (1) through fixing nuts (17); the device also comprises a fixed rod (10), and the sand inlet sections (12) of the sand collecting pipes (1) are respectively connected with the fixed rod (10)

When the sand collecting device is in a working state, the vacuum pump (8) discharges partial air in the protection box (2) through the exhaust pipe (9), so that negative pressure is formed in the protection box (2), sand grains with different external heights are respectively sucked into the corresponding sand collecting tubes (1), the sand grains in the sand collecting tubes (1) in the protection box (2) are diffracted and scattered after meeting laser emitted by the laser (5), and the optical information receiver (6) receives information and transmits the information to the signal processor (4) through the photoelectric converter (7) to be converted into required mass concentration information.

2. The laser scattering multi-elevation sand conveyance intensity synchronous measurement device according to claim 1, wherein: 15 sand collecting pipes (1) are arranged, and the sand inlet section (12) is a stainless steel circular pipe with the outer diameter of 20mm and the inner diameter of 18 mm.