CN119223332A

CN119223332A - Laser detection device

Info

Publication number: CN119223332A
Application number: CN202411360559.5A
Authority: CN
Inventors: 高征铠; 赵承平; 高泰; 高永�; 杨延超
Original assignee: BEIJING SHENWANG PIONEER TECHNOLOGY CORP
Current assignee: BEIJING SHENWANG PIONEER TECHNOLOGY CORP
Priority date: 2024-09-27
Filing date: 2024-09-27
Publication date: 2024-12-31

Abstract

The present application provides a laser detection device, including: a laser emitting mechanism, a laser transmission line and a collimator, wherein the laser transmission line and the collimator are fixed by a laser gun barrel; a sealing structure is used between the laser emitting mechanism and the laser gun barrel to prevent high-pressure leakage; the sealing structure includes a gun tail sealing seat with a roughly H-shaped cross-section, with threads at both ends, respectively fixedly connected to the through-hole nut and the laser gun barrel, and a accommodating space is formed between the through-hole nut for setting a notch sealing pad, and the notch sealing pad is pressed by hard connection on both sides; the notch sealing pad has a small hole in the middle for holding the laser transmission line tightly, and a slit is cut in half for sideways clamping on the laser transmission line. The present application can seal the laser transmission line at the tail end of the gun barrel of the laser scanning device through this structure to prevent pressure leakage, and can fix the collimator at the corresponding position at the front end of the gun barrel.

Description

Laser detection device

Technical Field

The application relates to an optical instrument or system, in particular to a laser detection device which can be used in a blast furnace burden surface online laser measurement project.

Background

The closed industrial kiln such as a blast furnace has an internal environment of high temperature, high pressure, high dust, etc., and thus, it is difficult to observe the environment through an observation window by human eyes. For this purpose, various detection devices have been proposed to acquire in-furnace information, such as infrared imaging, microwave scanning, and the like. Some of the detection means are arranged outside the furnace shell, transmitting and/or receiving detection signals through the viewing window, but this may hinder detection because the viewing window is prone to ash. It is therefore envisaged to arrange a detection element, such as a sensor such as a camera, within the oven.

CN1156149C discloses a plug-in kiln camera, which comprises a camera gun, a tube cooler, a sealing valve and a sealing sleeve. The front end of the camera gun is provided with a camera and a temperature measuring element. The camera gun passes through the sealing sleeve and the sealing valve until reaching the front end of the tubular cooler, so that the camera and the temperature measuring element at the front end of the camera gun are positioned in the blast furnace. Because the shooting gun is sealed through the sealing sleeve and the sealing valve, the sealing valve is closed when the shooting gun is pulled out between the sealing valve and the sealing sleeve in the blast furnace production process, and then the shooting gun is pulled out from the sealing sleeve, so that overhauling and maintenance are carried out. It should be noted that the camera gun does not have any moving parts.

CN100424465C discloses the detection of the information in the furnace of an industrial furnace by means of a laser trace formed by a divergent laser beam passing through smoke or dust in the furnace, but it does not describe the details of the laser device generating the laser beam. CN102382918B discloses that the charge level information of the blast furnace is detected by scanning the charge level in the furnace with laser light, and it is only generally mentioned that the laser may be a laser scanner with a laser deflection device (mirror or prism) in which the angle of the outgoing laser light is changed by rotating the deflection device. However, CN102382918B does not describe the detailed structure of the laser scanner nor teaches how to construct the laser scanner to be suitable for operation in high temperature, high pressure, high dust, etc. furnace environments.

Both CN118655697a and CN118655696a of the present inventor disclose a "laser scanning device", which is used in the on-line laser measurement project of blast furnace burden, the structure can place the rotating structure of the reflecting mirror inside the water jacket, but considering the specific use scenario, how the laser detection device is fixed inside the water jacket, and the laser scanning function is implemented together with the water jacket, how to fix, position, seal, etc. the problems need to be solved, for example, the laser transmission line is sealed at the tail end of the barrel of the laser scanning device to prevent pressure leakage, and the collimating mirror of the laser needs to be accurately positioned at the front end of the water jacket to align the reflecting mirror.

Disclosure of Invention

The application aims to provide a laser detection device, in particular to a sealing structure of a laser transmission line, by which the laser transmission line can be sealed at the tail end of a gun barrel of a laser scanning device to prevent pressure leakage, and a collimating mirror positioning structure of the laser transmission line, by which a collimating mirror can be fixed at a corresponding position at the front end of the gun barrel.

The laser detection device comprises a laser emission mechanism, a laser transmission line and a collimating mirror, wherein the laser transmission line and the collimating mirror are fixed through a laser gun barrel, high-pressure leakage is prevented between the laser emission mechanism and the laser gun barrel through a sealing structure, the sealing structure comprises a gun tail sealing seat with a cross section of approximately H shape, two ends of the gun tail sealing seat are provided with threads, the gun tail sealing seat is fixedly connected with a via nut and the laser gun barrel respectively, an accommodating space is formed between the gun tail sealing seat and the via nut and is used for arranging a gap sealing rubber cushion, the gap sealing rubber cushion is tightly pressed through hard connection on two sides, a small hole is formed in the middle of the gap sealing rubber cushion and is used for tightly holding the laser transmission line, a gap is cut at one half side of the gap sealing rubber cushion, the gap sealing rubber cushion is used for being clamped on the laser transmission line in a lateral clamping mode, and the gap sealing rubber cushion and the gun tail sealing seat are in interference fit.

As an improvement of the technical scheme, the number of the gap sealing rubber gaskets is 2 or more than 2, and the gaps are staggered. This arrangement allows the sealing effect to be optimised.

The sealing structure is characterized in that the sealing structure further comprises a gap gasket, the gap gasket is arranged between the gap sealing rubber gasket and the inner step of the gun tail sealing seat or/and between the gap sealing rubber gasket and the through hole nut, the gap gasket is made of metal, a gap is arranged in the lateral direction, and the inner diameter of the gap is slightly larger than a small hole in the middle of the gap sealing rubber gasket and is used for being clamped on a laser transmission line.

Theoretically, the sealing effect can be achieved by only extruding the opening sealing rubber cushion. Thus, the hard connections on both sides thereof can be set as the case may be. However, because the laser transmission line and the collimating lens are required to be penetrated, the gap between the through hole nut and the center of the sealing structure is relatively large, and a gasket with certain hardness is preferably added for effectively forming the extrusion of the opening sealing rubber gasket. The inner diameter of the opening is slightly larger than the small hole in the middle of the opening sealing rubber gasket, so that the opening sealing rubber gasket can be simultaneously and outwards unfolded when being extruded, and a better sealing effect is achieved.

In practical application, the middle of the through hole nut is hollow, one end of the through hole nut is provided with external threads connected with the end part of the gun tail sealing seat through internal threads, and the other end of the through hole nut can also be provided with external threads so as to be connected with a protective hose.

As a further improvement of the above technical solution, the sealing rubber pad may be a normal rubber pad. The via nut may be a hex nut to facilitate the tightening operation. The laser transmission line may be one or more optical fibers.

The laser detection device further comprises a laser emission mechanism, a laser transmission line and a collimating mirror, wherein the laser transmission line and the collimating mirror are fixed through a laser gun barrel, the collimating mirror penetrates through the laser gun barrel to extend out of a pipe and is fixed at the front end of the laser gun barrel through a collimating mirror positioning structure, the collimating mirror positioning structure comprises a notch limiting ring and a positioning cap, the positioning cap is fixedly connected with the front end of the laser gun barrel through threads and is used for accommodating the collimating mirror, the cross section of the notch limiting ring is approximately C-shaped and is used for being clamped on the laser transmission line in a lateral clamping mode, the notch limiting ring is clamped on the laser transmission line and is sleeved in the laser gun barrel, and the tail end of the notch limiting ring abuts against the front end of the laser gun barrel through a flange of the notch limiting ring so as to achieve the purpose of stopping the collimating mirror from retracting into the laser gun barrel.

As an improvement of the above technical solution, the notch limiting ring includes a first flange and a second flange, wherein the second flange abuts against the front end of the laser barrel, and the first flange is stopped in the positioning cap.

As a further improvement of the technical scheme, the positioning cap comprises a two-section cylindrical structure, the diameter of the rear end part is larger, the diameter of the front end part is smaller, and a limiting step is formed between the rear end part and the front end part and used for fixing the collimating lens between the positioning cap and the notch limiting ring. Further, the positioning cap further comprises a guiding slope which is arranged at the port of the front end part so as to guide the positioning cap to be sleeved into the corresponding positioning device.

Drawings

Fig. 1 shows a schematic diagram of an assembly of a laser detection device according to the application for a laser scanning device;

FIG. 2 shows a cross-sectional view of a laser gun of the laser detection device shown in FIG. 1;

FIG. 3 shows an exploded schematic view of another embodiment of a laser transmission line sealing structure of a laser detection device of the present application;

FIG. 4 is a cross-sectional view of the sealing structure shown in FIG. 3;

FIG. 5 is a cross-sectional view of a collimator positioning structure of a laser detection device of the present application;

FIG. 6 is an exploded schematic view of the collimating mirror positioning structure shown in FIG. 5;

fig. 7a-c are schematic structural views of a notch stop collar of the collimator lens positioning structure of the present application.

Drawing reference numerals

1. Laser 2, sealing cap 3, sealing sleeve

4. Ball valve 5, motor 6, laser gun sleeve

7. Laser barrel 8, water jacket 9, connecting rod

10. Laser transmission line 11, collimator 12, laser gun positioning hole

13. Reflecting mirror

20. Sealing structure

21. Through hole nut 22, gun tail sealing seat 23, gap gasket

24. Gap sealing rubber pad 25, fixing nut 26, gun barrel thread

30. Alignment mirror positioning structure

31. Notch spacing ring 32, spacing step 33, positioning cap

34. A guide ramp 35, a first flange 36, a second flange

Detailed Description

The technical scheme of the application is described in detail below with reference to the accompanying drawings and examples. In the drawings, the same or similar components are designated by the same or similar reference numerals.

As shown in fig. 1, which is a schematic diagram of an assembly in which the laser probe apparatus of the present application is used in a laser scanning apparatus, the left end portion in fig. 1 will be referred to as a trailing end portion and the right end portion will be referred to as a leading end portion for simplicity of description.

The laser 1 generates laser and transmits the laser through a laser transmission line 10, the laser transmission line 10 and a collimating mirror 11 are arranged in a thin round tubular laser gun barrel 7, the collimating mirror 11 is fixed at the front end of the gun barrel, and the laser transmission line 10 is sealed and fixed at the tail end of the laser gun barrel 7 by a sealing cap 2. The laser gun tube 7 passes through the sealing sleeve 3, the ball valve 4 and the laser gun sleeve 6 in the laser scanning device to enter the inner cavity of the water jacket 8, can be arranged at a position which is deviated from the bottom, and is clamped into the laser gun positioning hole 12 so as to be opposite to the reflecting mirror 13.

The reflecting mirror 13 is positioned at the front end of the inner part of the water jacket 8, and is connected with the motor 5 by extending out of the water jacket 8 through the connecting rod 9, and the reflecting mirror 13 can be driven to rotate through the connecting rod 9 when the motor 5 moves. The parallel laser beams are converged by the collimating mirror 11 and are reflected by the reflecting mirror 13 in a rotating way, so that the laser scanning action is realized.

The laser gun tube is a slender tubular structure and is used for installing and fixing a laser transmission line and a collimating lens, transmitting a light outlet of the collimating lens to the front end of the water jacket, and irradiating laser on a reflecting lens at the front end of the water jacket. The application has the structural design that the laser with larger diameter and positioned at the tail end and the collimator positioned at the front end are arranged outside the water jacket 8, and the laser transmission line and the collimator lens are only arranged inside the laser gun barrel, so that the laser emission mechanism is separated, and the structure is simpler and is convenient to operate and maintain. Because only the laser transmission line and the collimating lens are reserved in the laser gun barrel, the structure is greatly simplified, the diameter of the laser gun barrel can be reduced, and the cross-sectional area is reduced under the blast furnace pressure vessel, so that the bearing pressure is reduced.

As shown in fig. 2 to 4, the laser transmission line sealing structure 20 at the tail of the laser gun barrel comprises a gun tail sealing seat 22, two ends of the gun tail sealing seat are respectively connected with a through hole nut 21 and the laser gun barrel 7 in a threaded manner, the cross section is approximately H-shaped, the inner aperture can be tightly held with the laser transmission line 10 through the collimating mirror 11 and the laser transmission line 10, but the laser transmission line is thinner because of sealing, so that the laser transmission line is clamped by installing a gap gasket 23 and is abutted against the tail end side of the step inside the gun tail sealing seat 22, and then one or more gap sealing gaskets 24 are clamped on the laser transmission line 10, in the embodiment, the gap sealing gaskets 24 are half-cut to form a gap and are clamped on the laser transmission line 10, a small hole is formed in the middle of the gap gasket to hold the laser transmission line, and then the gap gasket 23 can be installed again, the gap gasket 23 is pressed by the through hole nut 21 to press the outer gap gasket 24, as shown in fig. 4, or the gap gasket 24 is directly pressed by the through the hole nut 21, as shown in fig. 2. The through hole nut 21 is connected with the gun tail sealing seat 22 by threads, and in the screwing process, the gap gasket 23 is pressed to deform the sealing 24 rubber pad to seal the laser transmission line, so that the gun tail is free from pressure leakage.

In addition, as a modification, the outside of the laser barrel 7 (the end part of which is connected with the gun tail sealing seat 22 in a threaded manner) can be further provided with a barrel thread 26 for installing a fixing nut 25, and the fixing nut 25 can be matched with external equipment to further fix the laser barrel 7.

As shown in fig. 4, the middle of the through hole nut 21 is also hollow, the collimating lens passes through the middle, and an internal thread can be connected with the gun tail sealing seat 22 and is pressed against the gap gasket 23 and the sealing rubber pad 24 for sealing. As an improvement, the outer part of the through hole nut is provided with a hexagonal plane, and a spanner tool can be used for screwing the nut. And the other end of the through hole nut is provided with external threads, so that the protective hose can be connected.

In practical use, the gap gasket 23 is generally made of metal, and needs a certain strength, and the sealing rubber pad 24 is a common rubber pad.

As shown in FIGS. 5-7, the collimating mirror positioning structure of the laser detection device comprises a notch limiting ring 31, a limiting step 32, a positioning cap 33 and a guiding slope 34.

The collimating mirror passes through the laser barrel 7 and stretches out of the pipe, a notch limiting ring 31 is clamped in the laser transmission line 10 to block the collimating mirror 11, the collimating mirror 11 is prevented from retracting, an external thread is arranged at the forefront end of the laser barrel 7 and used for connecting a positioning cap 33, and the collimating mirror 11 is fixed in the positioning cap 33.

As shown in fig. 5 and 6, the rear end portion of the positioning cap 33 has a larger diameter for accommodating the collimator lens 11, and the front end portion has a smaller diameter. A limit step 12 is formed between the rear end and the front end, so that the collimator lens can be accurately fixed at a corresponding position, and the front and rear displacement of the collimator lens is prevented. In addition, the foremost end of the positioning cap 33 may be provided with a guide slope 34 to smoothly enter into a positioning hole in the water jacket and be defined at a corresponding position.

As shown in fig. 7a, the cross section of the notch limiting ring 31 is approximately C-shaped, and is clamped on the laser transmission line 10 and sleeved in the laser barrel 7, and abuts against the front end of the laser barrel 7 through the flange at the tail end, so long as the caliber of the notch is smaller than that of the collimating lens 11, the collimating lens 11 can be blocked from retracting into the laser barrel 7.

As shown in fig. 7b, the notch limit ring 31 provided in this embodiment is provided with a first flange 35 and a second flange 36, wherein the second flange 36 abuts against the front end of the laser barrel 7, and the first flange 35 is stopped in the positioning cap 33. In practice, the first flange 35 is not necessary.

The application refers to a plurality of 'notches', which are all because the laser transmission line is in a thin round long tubular shape, and the two ends of the laser transmission line are respectively provided with the laser and the collimating mirror, in order to solve the problem of the suit, the related parts are all in a mode of arranging circumferential notches, and can be directly and laterally clamped in through the notches/notches.

The laser transmission line 10 may be one or more optical fibers.

The laser detection apparatus of the present application may be mounted to an industrial furnace such as a blast furnace such that a head end portion thereof protrudes into the furnace and a tail end portion thereof is located outside the furnace. It will be appreciated that the laser detection device may be used in other types of industrial kilns or other applications where laser scanning is required.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present application, which is intended to be covered by the appended claims.

Claims

1. A laser detection device comprises a laser emission mechanism, a laser transmission line and a collimating mirror, wherein the laser transmission line and the collimating mirror are fixed through a laser gun barrel;

The high-pressure leakage is prevented by a sealing structure between the laser emission mechanism and the laser gun barrel;

The sealing structure comprises a gun tail sealing seat with a cross section approximately in an H shape, wherein threads are arranged at two ends of the gun tail sealing seat, a via hole nut and a laser gun barrel are respectively fixedly connected, an accommodating space is formed between the gun tail sealing seat and the via hole nut, and the gun tail sealing seat is used for arranging a gap sealing rubber pad and tightly pressing the gap sealing rubber pad through hard connection of two sides;

A small hole is formed in the middle of the opening sealing rubber pad and used for tightly holding a laser transmission line, a gap is formed in the half side of the opening sealing rubber pad, the gap is used for being clamped on the laser transmission line in a lateral clamping mode, and the opening sealing rubber pad is in interference fit with the gun tail sealing seat.

2. The laser detection device of claim 1, wherein the number of the gap sealing rubber gaskets is 2 or more, and the gaps are staggered.

3. The laser detection device of claim 1 or 2, wherein the sealing structure further comprises a gap gasket disposed between the gap sealing gasket and an inner step of the gun tail sealing seat or/and between the gap sealing gasket and the via nut;

the gap gasket is made of metal, a gap is formed in the lateral direction, the inner diameter of the gap is slightly larger than a small hole in the middle of the gap sealing rubber pad, and the gap gasket is used for being clamped on a laser transmission line.

4. A laser detection device as claimed in claim 3, wherein the middle of the through hole nut is hollow, one end is provided with external threads connected with the end of the gun tail sealing seat by internal threads, and the other end can also be provided with external threads so as to be connected with the protection hose.

5. The laser detection device according to claim 1, wherein the sealing rubber pad is a common rubber pad, and the laser transmission line can be one or more optical fibers.

6. The laser detection device of claim 1, wherein the via nut is a hex nut.

7. The laser detection device of claim 1, further comprising a laser emitting mechanism, a laser transmission line and a collimator lens, the laser transmission line and the collimator lens being secured by a laser barrel;

The collimating mirror passes through the laser barrel and extends out of the tube, and is fixed at the front end of the laser barrel through a collimating mirror positioning structure;

The collimating mirror positioning structure comprises a notch limiting ring and a positioning cap;

The positioning cap is fixedly connected with the front end of the laser gun barrel through threads, and the interior of the positioning cap is used for accommodating the collimating lens;

the cross section of the notch limiting ring is approximately C-shaped and is used for being clamped on the laser transmission line in a lateral clamping mode, the notch limiting ring is clamped on the laser transmission line and is sleeved in the laser barrel, and the front end opening of the laser barrel is propped against the flange of the tail end portion of the notch limiting ring so as to enable the stopping collimating lens to retract into the laser barrel.

8. The laser detection device of claim 7, wherein the notch stop collar includes a first flange and a second flange, wherein the second flange abuts the front port of the laser barrel and the first flange terminates in the positioning cap.

9. The laser detection device of claim 7 or 8, wherein the positioning cap comprises a two-section cylindrical structure, the rear end portion has a larger diameter, the front end portion has a smaller diameter, and a limiting step is formed between the rear end portion and the front end portion for fixing the collimator lens between the positioning cap and the notch limiting ring.

10. The laser detection device of claim 9, wherein the positioning cap further comprises a guide ramp disposed at the front end port for guiding nesting with the corresponding positioning device.