Laser gun for laser scanning device

Abstract

The utility model relates to a laser gun for a laser scanning device, and the laser gun comprises a long gun barrel which is provided with a tail end part opening at the tail end part; the tail end sealing assembly is used for sealing the tail end opening of the gun barrel; the laser transmission line and the transmission rod penetrate through the tail end sealing assembly and extend into the gun barrel; the tail end sealing assembly comprises a positioning ring; the sealing cap comprises a sealing cap main body; threads are arranged on the outer wall of the annular side wall of the sealing cap, and the annular side wall of the sealing cap surrounds the outer wall of the gun barrel; the bottom wall of the sealing cap is provided with a contact face abutting against an opening in the tail end of the gun barrel, a laser transmission line mounting hole allowing a laser transmission line to penetrate and a transmission rod positioning hole allowing a transmission rod to penetrate. The positioning piece is used for keeping the relative position between the gun barrel and the sealing cap; the locking nut is provided with a bottom wall and an annular side wall; a through hole allowing the gun barrel to penetrate is formed in the bottom wall of the locking nut, and the bottom wall of the locking nut is further provided with a contact surface abutting against the positioning ring; threads are arranged on the inner wall of the annular side wall of the locking nut.

Description

Technical Field

[0001] The present application relates to an optical instrument or system, and in particular to a laser gun for a laser scanning device. Background Art

[0002] Closed industrial furnaces, such as blast furnaces, have high temperatures, high pressures, and high dust levels, making observation through observation windows difficult. To address this, various detection devices have been proposed to obtain information about the furnace interior, including infrared cameras, microwave scanners, and laser scanners.

[0003] Chinese patent application number 2024111313696 proposes a laser scanning device, which may include a laser gun and an outer sleeve into which it is inserted. The laser scanning device can be installed in an industrial furnace, such as a blast furnace, with its head end extending into the furnace and its tail end located outside the furnace. The laser emitted from the head end can scan inside the furnace to obtain information inside the furnace. The laser gun is used to transmit laser light generated by a laser generator outside the furnace into the furnace. The outer sleeve can protect the laser gun, allowing it to adapt to the harsh environment inside the furnace, and the outer sleeve can also provide other auxiliary and support functions. In one embodiment of the laser gun, the laser transmission line extends within the elongated barrel of the laser gun and is used to transmit the laser light. After being collimated by a collimator, it is reflected into the furnace by a reflector. The motor drive assembly drives the reflector frame with the reflector to rotate to perform scanning operations within a predetermined scanning angle range. The present application relates to changes and / or improvements to the laser scanning device in Chinese Patent Application No. 2024111313696. Therefore, the entire content of the Chinese patent application is incorporated into this specification by reference. Utility Model Content

[0004] The purpose of this application is to provide a laser gun for a laser scanning device.

[0005] The laser gun comprises: an elongated barrel, the barrel extending in a longitudinal direction and having a head end and a tail end opposite to each other along the longitudinal direction, the tail end having a tail end opening; a tail end sealing assembly for sealing the tail end opening of the barrel; a laser transmission line for transmitting laser light, which extends through the tail end sealing assembly into the barrel and extends along the barrel toward the head end; a transmission rod extending through the tail end sealing assembly into the barrel and operatively connected to a reflector frame to drive the reflector frame to rotate; wherein the tail end sealing assembly comprises: a positioning ring sleeved outside the barrel and detachably connected to the outer wall of the barrel; a sealing cap connected to the tail end opening of the barrel, comprising a sealing cap body; The sealing cap body is provided with a bottom wall and an annular side wall connected to the bottom wall; the outer wall of the annular side wall of the sealing cap is provided with a thread, and the annular side wall of the sealing cap surrounds the outer wall of the gun barrel; the bottom wall of the sealing cap has a contact surface that abuts against the open tail end of the gun barrel, a laser transmission line mounting hole that allows the laser transmission line to pass through, and a transmission rod positioning hole that allows the transmission rod to pass through; a positioning piece is used to maintain the relative position between the gun barrel and the sealing cap; a locking nut is provided with a bottom wall and an annular side wall connected to the bottom wall; the bottom wall of the locking nut is provided with a through hole that allows the gun barrel to pass through, and also has a contact surface that abuts against the positioning ring; the inner wall of the annular side wall of the locking nut is provided with a thread; wherein, by rotating the locking nut, it is threadedly connected to the outer wall of the sealing cap.

[0006] Optionally, the positioning ring is threadedly connected to the outer wall of the gun barrel.

[0007] Optionally, the positioning ring and the gun barrel are fixed in relative position by a top screw.

[0008] Optionally, a positioning hole is provided on the annular side wall of the sealing cap body; an elongated positioning groove is provided on the gun barrel along its axial direction near its rear end portion; the positioning member is a bolt, a screw or a top screw; one end of the positioning member passes through the positioning hole and enters the positioning groove; under the action of the positioning member and the positioning hole, the sealing cap body can only move along the axial direction of the gun barrel, and cannot rotate circumferentially.

[0009] Optionally, after the sealing cap body moves to a predetermined position along the axial direction of the gun barrel, the positioning member is used to press the sealing cap body between the sealing cap body and the gun barrel.

[0010] Optionally, the laser gun further includes a first sealing ring, and the bottom wall of the sealing cap body is provided with a groove for mounting the first sealing ring.

[0011] Optionally, the transmission rod is sealedly connected to the transmission rod positioning hole, and the laser transmission line is sealedly connected to the laser transmission line mounting hole.

[0012] Optionally, the laser gun further includes at least one second sealing ring; and the transmission rod positioning hole is provided with a groove for mounting the second sealing ring.

[0013] Optionally, the laser gun further comprises at least two second sealing rings; the transmission rod positioning hole is provided with a groove for installing the second sealing ring; and the transmission rod positioning hole is provided with a lubricant cavity for containing lubricant between any two grooves.

[0014] Optionally, the liquid level of the lubricant contained in the lubricant cavity is higher than the transmission rod.

[0015] Optionally, the transmission rod positioning hole is provided with an injection hole communicating with the outside and the lubricant chamber.

[0016] Optionally, the laser gun further comprises a filling hole cover for sealing the filling hole; the filling hole cover comprises: an upper filling hole cover, a spring and a lower filling hole cover; wherein the upper filling hole cover is threadedly connected or snapped to the oil filling hole; the spring is located between the upper filling hole cover and the lower filling hole cover, and pushes the lower filling hole cover toward the lubricant through elastic force.

[0017] Optionally, the laser gun further includes a third sealing ring, and the side wall of the injection hole lower cover is provided with a groove for mounting the third sealing ring.

[0018] Optionally, a slot is provided on the top of the injection hole upper cover.

[0019] Optionally, the injection hole upper cover and / or the injection hole lower cover is provided with an accommodating groove for accommodating the end of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An embodiment of a laser gun for a laser scanning device of the present application is shown;

[0021] Figure 2 yes Figure 1 perspective view of the reflective frame in the image;

[0022] Figure 3 yes Figure 1 A perspective view of the mount in FIG.

[0023] Figure 4 yes Figure 3 a perspective view of the mount as viewed from another upward angle;

[0024] Figure 5 Shown Figure 3 A mounting seat and a slider and a transmission rod mounted to the mounting seat;

[0025] Figure 6 The assembled state of the mount and the components connected thereto, which is to be inserted into the barrel of the laser gun;

[0026] Figure 7 Shown Figure 6 The structure shown has been placed in place on the barrel, and the mounting base and barrel will be connected with a key;

[0027] Figure 8 It is a schematic diagram of the vertical projection position relationship of the gun barrel, mounting base and key;

[0028] Figure 9 It is a partial transverse cross-sectional schematic diagram of the assembled laser gun;

[0029] Figure 10 is a partial longitudinal cross-sectional schematic diagram of an assembled laser gun;

[0030] Figure 11 This is a partial bottom view of the assembled laser gun;

[0031] Figure 12 This is a diagram of the assembly of the mount and key after ignoring the barrel;

[0032] Figure 13 yes Figure 1 A partial enlarged view of the tail end of the laser gun shown;

[0033] Figure 14 This is a perspective view of the outer wall of the gun barrel;

[0034] Figure 15 yes Figure 13 The first installation diagram of the tail end sealing assembly of the tail end of the laser gun is shown, wherein the sealing ring and the sealing sleeve are hidden;

[0035] Figure 16 yes Figure 13 The second installation diagram of the tail end sealing assembly of the tail end of the laser gun is shown

[0036] Figure 17 yes Figure 13 The first installation diagram of the tail end sealing assembly of the tail end of the laser gun is shown, wherein the sealing ring and the sealing sleeve are shown;

[0037] Figure 18 yes Figure 13 The figure shows a schematic diagram of the tail end sealing assembly of the tail end of the laser gun after the injection hole cover is installed;

[0038] Figure 19 yes Figure 18 A schematic diagram of the disassembled filling hole cover shown;

[0039] Figure 20 yes Figure 19 A perspective view of the nozzle cover is shown;

[0040] Figure 21 yes Figure 19 A perspective view of the lower cover of the filling hole is shown. DETAILED DESCRIPTION

[0041] The technical solution provided by the present invention is further described below in conjunction with the embodiments. In these drawings, the same or similar parts are marked with the same or similar reference numerals.

[0042] like Figure 1 As shown, the laser gun can be used in a laser scanning device and can include an elongated barrel 100. The barrel 100 can extend along a length direction or an axial direction and has a head end and a tail end opposite to each other along the length direction or the axial direction. Figure 1 The left end is called the tail end, and the right end is called the head end.

[0043] A laser transmission line 320 can extend from the exterior of the barrel 100 into the interior of the barrel 100 and along the barrel 100 toward its tip. Laser light generated by a laser generator 310 outside the barrel 100 can be transmitted to a desired location via the laser transmission line 320. The laser transmission line 320 can include one or more optical fibers. A collimator lens 330 can also be disposed within the barrel 100, mechanically and optically connected to the tip of the laser transmission line 320, to receive laser light from the laser transmission line 320 and collimate it for output.

[0044] The reflector frame 400 may be disposed inside the barrel 100 and may be disposed adjacent to the collimating mirror 330. Figure 2 As can be seen more clearly in FIG, the reflector frame 400 can carry a reflector M, so that the laser from the collimating mirror 330 can be reflected by the reflector M.

[0045] return Figure 1 , the reflector frame 400 can be driven to rotate by the motor drive assembly 200. The motor drive assembly 200 may include a motor 210 and a transmission rod 220. The transmission rod 220 may extend from the outside of the gun barrel 100 into the gun barrel 100 and extend along the gun barrel 100 toward its head end. The transmission rod 220 may be operably connected to the reflector frame 400 and the motor 210 respectively. The motor 210 may drive the transmission rod 220 to perform linear motion, and the linear motion of the transmission rod 220 drives the reflector frame 400 and the reflector M carried thereon to rotate around the axis A.

[0046] Near the front end of the barrel 100, the collimator lens 330, the reflector frame 400, and the transmission rod 220 can be held in the barrel 100 by a mounting base 500, which will be described in detail later. At the rear end of the barrel 100, the rear end seal assembly 600 can sealably support the transmission rod 220 and the laser transmission line 320, which will be described in detail in the last part of the specification.

[0047] Figure 2 It is a specific example of a reflector frame 400 on which a reflector M is mounted. Figure 1 As described above, the motor drive assembly 200 can drive the reflector frame 400 to rotate around the axis A. To this end, the reflector frame 400 can be formed with an axial hole 410, which can pass through the reflector frame 400 along the axis A. In the assembled state, a shaft (not shown) can pass through the axial hole 410, and the two ends of the shaft can be respectively held in Figure 1 4. The reflector frame 400 is provided with a mounting base 500 as shown. The reflector frame 400 may also be formed with a pin hole 420, which may penetrate the reflector frame 400 in a direction parallel to the axis A. In the assembled state, a pin (not shown) may pass through the pin hole 420 and be operably connected to the transmission rod 220 of the motor drive assembly 200. Like this, during operation, when the transmission rod 220 of the motor drive assembly 200 makes a linear motion, the reflector frame 400 may be pushed or pulled by the pin hole 420 to rotate around the rotation axis A defined by the shaft hole 410. In some embodiments, the shaft hole 410 and / or the pin hole 420 may not penetrate the entire reflector frame 400, but may be formed as blind holes at corresponding positions on both sides of the reflector frame 400. The shaft or pin for inserting the shaft hole 410 and / or the pin hole 420 may not be a single shaft or pin, but two half shafts or pins inserted from both sides.

[0048] Combine Figure 1 and Figure 2 It can be seen that when working, the laser generated by the laser generator 310 can be output through the laser transmission line 320 and the collimating mirror 330, and incident on the reflector M carried by the reflector frame 400; the reflector M can receive and reflect the incident laser. The outgoing laser formed by the reflection of the reflector M will be emitted along a plurality of different angles as the reflector frame 400 rotates, and will be emitted to the outside of the gun barrel 100 through the light slit or notch 103 formed on the end wall and / or side wall at the head end of the gun barrel 100, so as to perform laser scanning operations within a predetermined scanning angle range. The reflector frame 400 can rotate around the axis A in a plane, and the plane can be, for example, a plane perpendicular to the axis A (i.e. Figure 1 The scanning plane is also called the scanning plane.

[0049] The inventors of the present application have discovered that, due to the relatively small internal space of the long cylindrical structure of the gun barrel 100, it is relatively difficult to separately install the collimator lens 330 and the reflector frame 400 into the gun barrel 100, and it is also difficult to ensure alignment between the collimator lens 330, the reflector M of the reflector frame 400, and the light exit slit or notch 103 in the barrel wall of the gun barrel 100. The inventors of the present application have also discovered that, when fixing a component into the gun barrel 100, due to the relatively small internal space of the long cylindrical structure of the gun barrel 100, the conventional approach is to screw the component to the gun barrel 100 from the outside of the gun barrel 100 through the barrel wall of the gun barrel 100 using fasteners such as screws. However, since the laser gun is often inserted into an outer sleeve during operation (refer to Chinese patent application No. 2024111313696), when the screw or other fasteners become loose, they may fall into the space between the laser gun and the outer sleeve. In this way, when the laser gun needs to be pulled out of the outer sleeve for inspection, it may be stuck by the screw and cannot be pulled out normally.

[0050] For this reason, the inventor of the present application has carried out exquisite design to the structure of mounting pad 500 self and the connecting structure between mounting pad 500 and gun barrel 100, to avoid the appearance of aforementioned unfavorable situation.As will be understood by the description hereinafter, collimating mirror 330 of the present application and reflector frame 400 are installed and remain on same mounting pad 500 places, can be designed by the shape and position of the installation position of mounting pad 500 self like this, collimating mirror 330 after the installation and reflector frame 400 are just basically aimed at in advance.Before mounting pad 500 is put into gun barrel 100, collimating mirror 330, reflector frame 400 and transmission rod 220 can be installed thereon, and the structure for installing is inserted in the gun barrel 100 as a whole.This installation process is owing to being carried out in gun barrel 100 outside, therefore can carry out easily, and can not be subject to the restriction of the inside narrow space of gun barrel 100. Then, for the mounting base 500 that has been inserted into the gun barrel 100, the mounting base 500 can be connected to the predetermined position of the gun barrel 100 from the outside of the gun barrel 100, and this connection method does not create the risk of parts falling out of the gun barrel 100. In this way, not only the installation difficulties caused by the small internal space of the gun barrel 100 are overcome, but also the alignment between the relevant components can be ensured, and it can also be ensured that there will be no pulling obstacles caused by parts falling between the gun barrel 100 and the outer sleeve in which it is located. It will be understood by those skilled in the art that in some embodiments, only a portion of the above-mentioned multiple technical means can be used to achieve the effects corresponding to these technical means.

[0051] Figure 3 and Figure 4 An embodiment of the mount 500 is shown from different perspectives. Figure 5 The transmission rod 220 and the slider 540 are shown to have been installed to the mounting base 500. Figure 6 It is shown in FIG. 5 that the collimating mirror 330 and the reflecting mirror frame 400 have been installed on the mounting base 500 .

[0052] like Figures 3 to 6 As shown, the mounting base 500 can extend along a length direction and have a head end (right side in the figure) and a tail end (left side in the figure) opposite to each other along its length direction. The mounting base 500 can have a collimating mirror mounting portion 510 located at its tail end and a reflector frame mounting portion 530 located at its head end. The collimating mirror mounting portion 510 is used to mount and retain the collimating mirror 330, and the reflector frame mounting portion 530 is used to mount and retain the reflector frame 400. A connecting portion 520 can be provided between the collimating mirror mounting portion 510 and the reflector frame mounting portion 530.

[0053] The collimator lens mounting portion 510 may have a first transmission rod through hole 511 that allows the transmission rod 220 to pass through, and a collimator lens accommodating hole 512 for accommodating the collimator lens 330. The collimator lens accommodating hole 512 may be located below the first transmission rod through hole 511. The collimator lens mounting portion 510 may also have a top screw through hole 513 that passes through the outer surface of the collimator lens mounting portion 510 to the collimator lens accommodating hole 512. The top screw through hole 513 may be formed with threads. When installing the collimator lens 330, the collimator lens 330 may be inserted into the collimator lens accommodating hole 512, and then the top screw (not shown) may be screwed into the top screw through hole 513 until it presses against the collimator lens 330, so that the collimator lens 330 is fixedly held in the accommodating hole 512. In particular, Figure 4 As can be seen in the figure, the collimator lens mounting portion 510 can be provided with multiple screw holes 513 at various locations, such as on the side wall and bottom wall, so that the position of the collimator lens 330 within the collimator lens receiving hole 512 can be fine-tuned by adjusting the screw insertion depth in different directions. In other embodiments, the collimator lens 330 can also be retained in the collimator lens receiving hole 512 by other means, such as a snap connection.

[0054] The reflector frame mounting portion 530 may include an end wall portion 530A and a first side wall 530B and a second side wall 530C extending laterally therefrom. The end wall portion 530A may be cylindrical and may be matched with the inner wall of the cylindrical gun barrel 100. The end wall portion 530A may be formed with a second transmission rod through hole 531 therein, which allows the transmission rod 220 to pass through. The first transmission rod through hole 511 and the second transmission rod through hole 531 extend along the same straight line or are coaxially arranged and are substantially parallel to the length direction of the gun barrel 100, so as to constrain the transmission rod 220 inserted therein to perform linear motion in a predetermined linear direction. The end wall portion 530A may also be formed with a light transmission hole 532 therein, which may be located below the second transmission rod through hole 531. The light hole 532 is located on the optical path of the laser emitted from the collimator 330 in the collimator accommodating hole 512 , allowing the laser emitted from the collimator 330 to pass through the light hole 532 and be incident on the reflector M carried by the reflector frame 400 .

[0055] The first side wall 530B and the second side wall 530C may be mirror-symmetrical and may form a narrow passage therebetween for receiving the reflector frame 400. The reflector frame 400 may be rotatably arranged between the first side wall 530B and the second side wall 530C and connected to the first side wall 530B and the second side wall 530C. In this embodiment, the first side wall 530B and the second side wall 530C are symmetrically provided with reflector frame mounting holes 533 extending in the direction of the axis A. The position and size of the reflector frame mounting holes 533 may be different from the position and size of the reflector frame mounting holes 533. Figure 2 The shaft hole 410 of the reflector frame 400 cooperates to allow the rotation axis 592 (see Figure 7 ) is inserted into the reflector frame mounting hole 533 and extends into the shaft hole 410, so that the reflector frame 400 can rotate around the rotation axis 592 or the axis A. The rotation axis 592 can be a single axis passing through the first side wall 530B and the second side wall 530C, or it can be two half axes passing through the first side wall 530B and the second side wall 530C from two sides.

[0056] The slider 540 can be fixedly connected to the transmission rod 220 at the head end of the transmission rod 220, for example, by a threaded connection, and can move linearly with the transmission rod 220. The slider 540 can be rotatably connected to the reflector frame 400, and the transmission rod 220 can drive the reflector frame 400 to rotate via the slider 540, as will be described below. The inner surface of each of the first side wall 530B and the second side wall 530C can be formed with a slideway 534 along the length of the gun barrel 100 or the mounting base 500. The slider 540 can be located in the narrow passage between the first side wall 530B and the second side wall 530C and can be supported by the slideway 534. In this way, under the drive of the transmission rod 220, the slider 540 can reciprocate linearly along the length of the gun barrel 100 on the slideway 534, thereby driving the reflector frame 400 to rotate. By supporting the slider 540 by the slideway 534, the stability of the linear motion of the transmission rod 220 and the slider 540 is improved. The slider 540 may have a substantially “door”-shaped cross section, and its two side walls may respectively abut against the slideways 534 of the first side wall 530B and the second side wall 530C so as to be slidably supported.

[0057] like Figure 6 As shown, the reflector frame 400 can be rotatably connected to the slider 540 between the two side walls of the door-shaped slider 540. Figure 7 In the area indicated by reference numeral 591, the slider 540 has a vertically extending long hole through which a pin extends. Figure 2 The pin is inserted into the pin hole 420 of the reflector frame 400 shown in the figure. Thus, when the slider 540 and the transmission rod 220 perform a lateral linear motion together, the pin can push or pull the reflector frame 400 to rotate, and the pin can move vertically relative to the long hole of the slider 540. The two outer ends of the pin can be retained between the first side wall 530B and the second side wall 530C of the reflector frame mounting portion 530 and prevent it from falling out.

[0058] As previously mentioned, a connection portion 520 may be provided between the collimator mounting portion 510 and the reflector frame mounting portion 530 of the mounting base 500. The collimator mounting portion 510 and the reflector frame mounting portion 530 are fixedly connected to the connecting portion 520 at their respective ends or are integrally formed with the connecting portion 520. The connecting portion 520 may be located entirely at the bottom of the mounting base 500 to avoid the exit light path of the collimator 330. Since the collimator 330 and the reflector frame 400 are both mounted on the same mounting base 500, they can be easily aligned by pre-designing the mounting positions of the collimator 330 and the reflector frame 400 on the mounting base 500.

[0059] The outer contour of the mounting base 500 along the circumference can partially or completely match the inner wall shape or inner circumferential profile of the barrel wall of the gun barrel 100, so that the mounting base 500 can move and / or rotate circumferentially along the length direction of the gun barrel 100 in the gun barrel 100, but basically will not move or shake in the lateral direction perpendicular to the length direction of the gun barrel. The outer contour along the circumference or circumferential outer profile mentioned here refers to the overall outer contour of the circumference when viewed from the end face of the mounting base 500, rather than the circumferential outer profile of the individual positions along its length direction. The mounting base 500 can have different shapes and profiles at various positions along its length direction. For example, when the gun barrel 100 is cylindrical, the circumferential outer profile of the mounting base 500 can be circular, and its diameter can be slightly smaller than the inner diameter of the gun barrel 100, but different parts of the mounting base 500 can have different shapes. The outer contour of the end wall portion 530A of the reflector frame mounting portion 530 can be circular; the outer contours of the first side wall 530B and the second side wall 530C of the reflector frame mounting portion 530 are two diametrically opposed and spaced arcs; the outer contours of the top and bottom of the collimator mounting portion 510 can also be two diametrically opposed and spaced arcs, but the arrangement direction of these two arcs is substantially perpendicular to the two arcs formed by the outer surfaces of the first side wall 530B and the second side wall 530C. Although the outer contours may vary at different locations, the overall circumferential outer contour of the mounting base 500 forms a circle. It can also be understood that in other embodiments, the overall circumferential outer contour of the mounting seat 500 may only partially match the inner circumferential contour of the barrel wall of the gun barrel 100. In this case, the mounting seat 500 can still move along the length direction of the gun barrel 100 and / or rotate circumferentially within the gun barrel 100, but will basically not move or shake in the lateral direction perpendicular to the length direction of the gun barrel. This can be seen from the outer contour of the collimating lens mounting portion 510 or the outer contours of the first side wall 530B and the second side wall 530C.

[0060] The matching of the outer circumferential contour of the mount 500 and the inner circumferential contour of the barrel wall of the gun barrel 100 described above is important for the stability and convenience of the connection between the mount and the gun barrel 100 described below.

[0061] After the various components that the mounting base 500 needs to carry are installed at the predetermined positions of the mounting base 500, basically Figure 6 As shown, they are then inserted together into a predetermined position within the barrel 100, as shown. Figure 7 After the mounting base 500 is arranged in the gun barrel 100 , the connection portion 520 of the mounting base 500 can be connected to the gun barrel 100 in a rotationally fixed manner using the key 560 .

[0062] In order to more clearly understand the connection structure between the mounting base 500 and the barrel 100, Figure 8 The gun barrel 100, mounting base 500, and key 560 involved in the connection structure are shown separately, and the mounting base 500 is vertically translated to the outside of the gun barrel 100, but the horizontal position relationship of each component remains unchanged. It should be understood that in the actual assembly state, the mounting base 500 is located inside the gun barrel 100. Figure 8 As shown, the barrel wall of the gun barrel 100 may be formed with a through groove 110, which passes through the barrel wall of the gun barrel 100. The connecting portion 520 of the mounting base 500 may be formed with a key groove 522 recessed inward from its outer surface. In the assembled state, the key groove 522 corresponds to the position of the through groove 110. A first through hole 521 communicating with the key groove 522 and passing through the connecting portion 520 may be formed at the bottom of the key groove 522. The key groove 522 of the mounting base 500 and the first through hole 521 therein are formed in the Figure 4 The keyway 522 and the through slot 110 can together form a receiving space 560' for receiving the key 560, which can be seen in FIG. Figure 7 The shape of the key 560 matches the shape of the through-slot 110 of the barrel 100. When assembled, the key 560 can be securely held within the through-slot 110. The key 560 can have a second threaded through-hole 561. When assembled, the second threaded through-hole 561 is substantially aligned with the first through-hole 521 to receive the threaded fastener 550. The threaded fastener 550 can pass through the first through-hole 521 and be screwed into the second threaded through-hole 561, thereby forming a threaded connection therewith, thereby securely connecting the key 560 to the mounting base 500. During the connection process of the key 560, a portion of the key 560 extends into the keyway 522 of the mounting base 500. Because the key 560 is fixedly connected to the mounting base 500 and is retained by the through-slot 110 of the gun barrel 100, the form fit between the key 560 and the through-slot 110 prevents the mounting base 500 from moving in the longitudinal direction of the gun barrel 100 or rotating in the circumferential direction relative to the gun barrel 100. Furthermore, the restriction on movement of the mounting base 500 by the key 560, combined with the aforementioned description of the outer contour of the mounting base 500 and the inner contour of the gun barrel 100 and the restriction on lateral movement of the mounting base 500 relative to the gun barrel 100 due to the fit between these contours, allows the mounting base 500 to be securely retained within the gun barrel 100.

[0063] Figure 7 The mounting base 500 is shown inserted into the gun barrel 100, but the key 560 has not yet been installed. At this point, the keyway 522 of the mounting base 500 is aligned with the through-slot 110 of the gun barrel 100, forming a receiving space 560' ready to receive the key 560. The threaded fastener 550 is already positioned within the first through-hole 521 and extends into the receiving space 560', awaiting threading into the second threaded through-hole 561 of the key 560.

[0064] Figure 9 and Figure 10 They are respectively a partial cross-sectional schematic diagram and a partial longitudinal cross-sectional schematic diagram of the laser gun after assembly. Figure 9 and Figure 10 As shown, the threaded fastener 550 may have an enlarged fastener head 551 and a fastener shank 552 with threads. The fastener head 551 is the first end of the threaded fastener 550, and the end of the fastener shank 552 is the second end of the threaded fastener 550 opposite to the first end. It should be noted that the engaging portion 5522 of the threaded fastener 550 for engaging a screwing tool such as a screwdriver is formed at the second end of the threaded fastener 550, that is, at the end of the fastener shank 552. Obviously, this is different from conventional fasteners. For conventional fasteners with an enlarged head, the engaging portion is usually formed at its enlarged head rather than its thinner end. Figure 9 In the embodiment, the engaging portion 5522 of the threaded fastener 550 is a flat groove suitable for receiving a flat screwdriver. In other embodiments, the engaging portion can also be in the form of various grooves such as a cross groove or a hexagonal groove, or various shapes of protrusions, as long as it can cooperate with the screwing tool to rotate the threaded fastener 550. Figure 8 and Figure 9 As can be seen, the first through hole 521 of the connecting portion 520 of the mounting base 500 can have a flared section 5211 and a tapered section 5212 along its extension direction. The flared section 5211 has a larger transverse dimension than the tapered section 5212, and a step is formed at the transition between the flared section 5211 and the tapered section 5212. The fastener head 551 of the threaded fastener 550 can be received in the flared section 5211 and can abut against the step. The fastener shank 552 of the threaded fastener 550 can extend through the tapered section 5212, protrude out of the first through hole 521, and continue to extend toward the barrel 100 to connect with the key 560.

[0065] refer to Figure 6 、 Figure 9 and Figure 10 In order to prevent or prevent the threaded fastener 550 from accidentally coming out of the first through hole 521 of the mounting base 500 and falling into the gun barrel 100, a retaining member 570 can be provided to retain the threaded fastener 550 in the first through hole 521. The retaining member 570 can be detachably connected to the mounting base 500. The retaining member 570 can be in the shape of an elongated strip and extend laterally above the fastener head 551 of the threaded fastener 550 to prevent the threaded fastener 550 from completely coming out of the first through hole 521. The connecting portion 520 of the mounting base 500 can have a through retaining member hole 523 (see Figures 3 to 5), the retainer 570 can be inserted into the retainer hole 523 and extend laterally through the flared section 5211 of the first through hole 521, thereby confining the fastener head 551 of the threaded fastener 550 within the flared section 5211 and ultimately retaining the threaded fastener 550 within the first through hole 521 to prevent it from falling out. The retainer 570 can be elastic, such as a steel wire, or can be rigid. In other embodiments, the retainer 570 can also be other shapes or structures suitable for preventing the threaded fastener 550 from falling out. In other embodiments, the retainer can also extend outside the first through hole 521 above its flared section 5211. During the assembly process, the threaded fastener 550 can be inserted into the first through hole 521 first, and then the retainer 570 can be installed in place.

[0066] The working principle of the connection structure between the mounting base 500 and the barrel 100 is described below. Figure 12 After the threaded fastener 550 is screwed into the second threaded through hole 561 in the key 560, the mounting base 500 and the key 560 fixedly connected to each other can be regarded as an integral structure, that is, Figure 12 The structure shown. It should be understood that Figure 12 This is shown only for the purpose of illustrating the principle. In practice, during assembly, the key 560 is connected to the mount 500 after the mount 500 is inserted into the barrel 100. Figure 12 At this time, the portion of the key 560 extending out of the keyway 522 can be regarded as an outwardly extending protrusion of the overall structure. Since the protrusion will be located in the through slot 110 of the barrel 100, the shape fit between the protrusion and the through slot 110 can limit the movement of the mounting base 500 along the length direction of the barrel 100 and the rotation around the axial direction of the barrel 100. Figures 9 to 11 See more clearly in.

[0067] Based on the above working principle, it can be seen that the keyway 522 on the mounting base 500 is not necessary. Even without the keyway 522, as long as the key 560 is secured to the mounting base 500 using the threaded fastener 550 and the key 560 can be inserted into the through-slot 110 of the barrel 100, the aforementioned function of restricting the movement and rotation of the mounting base 500 relative to the barrel 100 can still be achieved. However, the inventors of the present application have discovered that if the keyway 522 is absent, and if the key 560 and the threaded fastener 550 are not intended to protrude from the outer surface of the barrel 100 when assembled, the thickness of the key 560 cannot exceed the wall thickness of the barrel 100. Therefore, if the wall of the barrel 100 is relatively thin, the length or depth of the threaded connection between the threaded fastener 550 and the key 560 will be very short, even shorter than the thickness of the key 560, which greatly hinders the secure retention of the key 560 by the threaded fastener 550. Furthermore, without the keyway 522, the threaded fastener 550 would need to extend into the through-slot 110 of the barrel 100. Therefore, even if the retaining member 570 were resilient enough to allow the threaded fastener 550 to temporarily retract into the barrel 100, this length of threaded fastener 550 could still hinder the insertion of the mounting base 500 into the barrel 100. In light of this discovery, the keyway 522 is preferably formed on the connecting portion 520 of the mounting base 500 at a position corresponding to the through-slot 110 of the barrel 100. Because the keyway 522 accommodates the key 560, the key 560 can have a sufficient thickness, which also allows the second threaded through-hole 561 therein to have a sufficient depth or length. Thus, even if the threaded fastener 550 does not extend into the through-slot 110 of the barrel 100, the portion of the threaded fastener 550 that extends into the keyway 522 is sufficient to form a sufficient length of threaded connection with the key 560, thereby enabling the threaded fastener 550 to stably retain the key 560. The depth of the keyway 522 may be greater than the depth of the through-slot 110, and preferably significantly greater than the depth of the through-slot 110, for example, at least 1.5 times the depth of the through-slot 110. Of course, the keyway 522 may be omitted if the barrel 100 has a thicker wall, if it is not necessary to restrict the key from protruding from the outer surface of the barrel, or in other applicable circumstances.

[0068] The following describes the assembly process of the laser gun of the present application. First, before placing the mounting base 500 into the gun barrel 100, the various components to be carried are installed in the predetermined positions of the mounting base 500. These components may include the collimator 330, the transmission rod 220 and its slider 540, the reflector frame 400, the threaded fastener 550 and its retainer 570. The structure after such assembly is as follows: Figure 6 As shown. Figure 6As can be seen in FIG, the reflector frame 400 can be temporarily rotated to a state substantially parallel to the reflector frame mounting portion 530 and within the circumferential outer contour of the reflector frame mounting portion 530, so that the reflector frame 400 will not interfere when the mounting seat 500 is inserted into the barrel 100. Next, Figure 6 The structure shown is inserted into the barrel 100 as a whole, and the keyway 522 of the mounting seat 500 is substantially aligned with the through slot 110 of the barrel 100. Figure 7 Next, the key 560 is placed into the through slot 110 of the gun barrel 100 from outside the gun barrel 100, while aligning the second threaded through holes 561 of the key 560 with the second ends of the threaded fasteners 550 extending outward from the bottom wall of the keyway 522. Finally, the tip of a screwdriver or other suitable screwing tool is inserted through the second threaded through holes 561 of the key 560, engaging the engagement portion 5522 of the second end of the threaded fastener 550, and tightening the threaded fastener 550. This gradually screws the threaded fastener 550 into the second threaded through holes 561 of the key 560, forming a threaded connection therewith. Under the interaction between the external thread of the fastener shank 552 of the threaded fastener 550 and the internal thread of the second threaded through hole 561 of the key 560, since the threaded fastener 550 is retained in the first through hole 521, the key 560 gradually moves downward or inward along the fastener shank 552 of the threaded fastener 550 into the keyway 522, forming Figures 9 to 11 In other words, in this case, the threaded fastener 550 can be said to pull the key 560 inward using the thread between the threaded fastener 550 and the key 560. When the threaded fastener 550 is first screwed in, the key 560 can be pressed by hand to help the threaded fastener 550 smoothly screw into the second threaded through hole 561 and form a threaded connection therewith.

[0069] It should be noted that in this assembled state, if Figure 9 and Figure 10 As shown, the second end of the fastener shank 552 of the threaded fastener 550 is completely located within the second threaded through hole 561 of the key 560, that is, it does not protrude from the key 560, thereby ensuring the smoothness of the exterior of the laser gun. Similarly, the thickness of the key 560 can be set so that after assembly, it is completely accommodated in the accommodation space 560' formed by the through groove 110 and the key groove 522. The outer surface of the key 560 is substantially flush with the outer surface of the gun barrel 100 or slightly recessed, and does not protrude from the outer surface of the gun barrel 100. Figure 10In the embodiment, the portion of the key 560 that enters the key groove 522 substantially extends through the entire depth of the key groove 522, so that a sufficiently long threaded connection length is provided between the fastener shank 552 of the threaded fastener 550 and the second threaded through hole 561 of the key 560. In this case, the thickness of the key 560 can be substantially equal to or slightly less than the total depth of the key groove 522 and the through groove 110, so that the key 560 can extend through the entire key groove 522 and the through groove 110 along its thickness direction, and as shown in FIG. Figure 11 As shown, after installation, the key 560 does not protrude from the barrel 100. Of course, in other embodiments, the thickness of the key 560 can also be significantly less than the total depth of the keyway 522 and the through-slot 110. In this case, when installing the key 560, it is preferred to ensure that the key 560 extends within the through-slot 110 without lowering the key 560 to the bottom wall of the keyway 522.

[0070] In addition to the thickness of the key 560, the length of the threaded fastener 550 is also of concern. It is desirable that the threaded fastener 550 provide a sufficiently long threaded connection with the second threaded through-hole 561 of the key 560, while also being in a position to prevent it from obstructing insertion of the mounting base 500 into the barrel 100 or extending beyond the outer surface of the barrel 100 after assembly. In one embodiment, the length of the threaded fastener 550 can be configured such that, in the assembled state, its second end is substantially flush with or recessed from the outer surface of the barrel 100. In this case, the tapered section 5212 of the first through-hole 521 of the mounting base 500 can be threaded. Prior to inserting the mounting base 500 into the barrel 100, the threaded fastener 550 can be threadedly engaged with the tapered section 5212, pre-retracted, so that the second end of the threaded fastener 550 does not obstruct insertion of the mounting base 500. In the illustrated embodiment, the length of the threaded fastener 550 is configured such that, in the assembled state, its second end is substantially flush with the circumferential outer contour of the mounting base 500, thereby not interfering with the insertion of the mounting base 500 into the barrel 100. In other words, the length of the threaded fastener 550 is such that, after extending from the first through-hole 521, it can only extend substantially through the entire keyway 522 and does not substantially enter the through-slot 110 of the barrel 100. This length of the threaded fastener 550 not only does not interfere with the insertion of the mounting base 500, but also prevents it from protruding beyond the outer surface of the barrel 100.

[0071] The first through hole 521 of the mounting base 500 may be a non-threaded hole, but as in other embodiments described above, the first through hole 521 may also be a threaded hole, and due to the retaining effect of the threaded hole itself, the retaining member 570 described above may be omitted.

[0072] Figure 11As shown in the figure, the key 560 is long with arcs at both ends, but in other embodiments, it can also be rectangular, circular, or special-shaped, as long as the through slot 110 and the key 560 have matching shapes.

[0073] As mentioned above, the outer circumferential contour of the mounting seat 500 cooperates with the inner circumferential contour of the barrel 100 wall. This prevents the mounting seat 500 from lateral movement relative to the barrel 100, thereby preventing the key 560 from moving inwardly toward the barrel 100 and disengaging from the through-slot 110 of the barrel 100. Of course, in other embodiments, other means may be employed to prevent the key 560 from disengaging from the through-slot 110. For example, in other embodiments, if the barrel 100 wall is sufficiently thick, an outwardly facing step may be formed along the perimeter of the through-slot 110, against which the key 560 abuts, preventing the key 560 from entering the barrel 100. In other embodiments, a set screw may be used on the barrel 100 wall opposite the through-slot 110 to abut the mounting seat 500, thereby preventing the key 560 from disengaging from the through-slot 110.

[0074] It should also be noted that by pre-setting the positions of the key 560, the through slot 110 of the gun barrel 100, and the key slot 522 of the mounting base 500, when the installed laser gun is in operation, the outgoing laser reflected by the reflector M carried by the reflector frame 400 can be aligned with the light outlet slit or notch 103 at the end of the gun barrel 100.

[0075] As proposed in Chinese patent application number 2024111313696, "A Laser Scanning Device," in some harsh environments, such as those characterized by high temperatures and high dust levels, an outer sleeve may be installed on the exterior of the laser gun to isolate or at least protect it from the effects of the furnace environment. The laser gun and the outer sleeve require frequent insertion and removal. If foreign matter gets between them, or if the outer wall of the laser gun is not smooth, they can become stuck, preventing the laser gun from being removed or inserted. In this application, after the key 560 snaps into the through slot 110 of the barrel 100, the barrel 100 forms an overall cylindrical shape without protrusions, making insertion and removal easy. Furthermore, this application utilizes the special design of the threaded fastener 550 to avoid the possibility of it becoming stuck due to loosening. In this application, even if the threaded fastener 550 becomes loose, it can only move toward the interior of the barrel 100, not outward and affecting the smoothness of the exterior.

[0076] The connection between the mounting base 500 and the gun barrel 100 described above is not limited to the specific case of laser guns but has a more general scope of application. The principles underlying this connection method can be applied to any other situation requiring the retention of a second component within a cylindrical first component. Therefore, this application also proposes a connection structure comprising a cylindrical first component, a second component disposed within the first component, and a key and threaded fastener for retaining the second component within the first component. In this connection structure, the gun barrel 100 described above is actually an embodiment of the first component, and the mounting base 500 is actually an embodiment of the second component. The structural features described above for the gun barrel 100 and mounting base 500 are applicable to both the first and second components, and the structural features described above for the key 560 and threaded fastener 550 are also applicable to the key and threaded fastener of this general connection structure. Furthermore, the other features and corresponding descriptions described above for the connection between the mounting base 500 and the gun barrel 100 are applicable to this general connection structure. Therefore, this general connection structure will not be further described here.

[0077] In the laser gun proposed in Chinese patent application number 2024111313696, "A Laser Scanning Device," the transmission rod 220 and laser transmission line 320 extend directly through the rear end wall of the barrel 100, but there is no specific description of how to install the transmission rod 220 and laser transmission line 320. Furthermore, the technical solution indicates that an opening is provided at the head end of the barrel 100 to insert the transmission rod 220 and laser transmission line 320. The inventors of this application discovered that because the head end is located within the furnace, a poor seal at the head end opening would create the risk of gas leakage within the furnace. Furthermore, when replacing or repairing internal components of the barrel 100, the laser gun must be removed entirely for replacement, increasing the difficulty of installation and maintenance.

[0078] To address the aforementioned issues, unlike the structure proposed in this document, the present invention installs the transmission rod 220, collimating lens 330, and laser transmission line 320 from the rear end of the barrel 100. During installation, the transmission rod 220 is relatively fixed and cannot rotate. Rotating the laser transmission line 320 could also cause entanglement and damage. Therefore, the inventors of this application have proposed a rear end seal assembly 600 that can seal the rear end of the barrel 100 without rotating the transmission rod 220 and laser transmission line 320. This rear end seal assembly 600 also provides support and lubrication for the transmission rod 220.

[0079] The tail end seal assembly 600 may include a positioning ring 610 that is detachably connected to the outer wall of the barrel 100. The positioning ring may be detachably connected to the outer wall of the barrel 100 via a thread. By rotating the positioning ring 610, the relative position of the positioning ring 610 and the barrel 100 may be adjusted. Figure 14 As shown, an annular groove 101 is provided along the circumference of the outer wall of the gun barrel 100, into which the positioning ring 610 can be inserted. There can be multiple annular grooves 101, so as to adjust the relative position of the positioning ring 610 and the gun barrel 100. After the positioning ring 610 is in a preset relative position, to prevent the position of the positioning ring 610 from shifting during subsequent installation, a hole can be provided along the diameter of the positioning ring 610. A top screw 611 is inserted into the hole to press against the outer wall of the gun barrel 100, thereby maintaining the relative position between the positioning ring 610 and the gun barrel 100.

[0080] The tail end seal assembly 600 also includes a seal cap 630. Figure 13 As shown, the sealing cap 630 is connected to the opening of the rear end portion of the gun barrel 100 and can locate the circumferential position of the transmission rod 220 . Figure 15 To more clearly show the structure of the sealing cap 630. Figure 15 The transmission rod 220 and the laser transmission line 320 are hidden. Figure 15 As shown, the sealing cap 630 includes a sealing cap body 631, which is provided with a bottom wall and an annular side wall connected to the bottom wall. The diameter of the sealing cap annular side wall is slightly larger than the outer diameter of the gun barrel 100. The annular side wall is provided with a positioning hole 634. The gun barrel 100 is provided with an elongated positioning groove 102 along the axial direction near its rear end. Figure 15 The sealing cap body 631 is also shown as having a transmission rod positioning hole 632 for inserting the transmission rod 220 and a laser transmission line mounting hole 633 for inserting the laser transmission line 320. The transmission rod positioning hole 632 can be sealedly connected to the transmission rod 220. The laser transmission line mounting hole 633 can be sealedly connected to the laser transmission line 320. After the gun barrel 100 is inserted into the sealing cap body 631, a positioning member 640, such as a bolt, screw, or set screw, can be inserted into the positioning hole 634, with the tail end of the positioning member 640 extending into the elongated positioning groove 102. Under the action of the positioning member 640 and positioning hole 634, the sealing cap body 631 can only move axially of the gun barrel 100 and cannot rotate circumferentially, thereby limiting the circumferential position of the transmission rod 220 and laser transmission line 320 mounted on the sealing cap 630. The outer wall of the annular sidewall of the sealing cap body 631 is provided with a third thread 635.

[0081] The tail seal assembly 600 also includes a locking nut 620. The locking nut 620 has a bottom wall and an annular sidewall connected to the bottom wall. The bottom wall of the locking nut 620 has a through hole for the barrel 100 to pass through and a contact surface for contact with the retaining ring 610. The inner wall of the side wall of the locking nut 620 is provided with a fourth thread 621 that mates with the third thread 635. The diameter of the through hole in the bottom wall of the locking nut 620 is only slightly larger than the outer diameter of the barrel 100.

[0082] When installing the tail end sealing assembly 600, the transmission rod 220 can be first inserted into the transmission rod positioning hole 632, and the laser transmission line 320 can be inserted into the laser transmission line installation hole 633. Figure 15 As shown, the positioning ring 610 can be connected to the barrel 100 and fixed to a predetermined axial position. Figure 16 As shown, the sealing cap 630 is then installed from the rear end to the front end of the gun barrel 100. The annular side wall of the sealing cap body 631 surrounds the side wall of the gun barrel 100, and the rear end of the gun barrel 100 faces the bottom wall of the sealing cap body 631. Align the positioning hole 634 with the elongated positioning groove 102, and insert the positioning member 640 to fix the circumferential position of the sealing cap body 631. Figure 13 As shown, the locking nut 620 is inserted through the tip of the gun barrel 100. The locking nut 620 is rotated so that the fourth thread 621 of the locking nut 620 engages the third thread 635 of the sealing cap body 631 until the bottom wall of the locking nut 620 abuts the positioning ring 610 and is locked to the sealing cap body 631. As can be seen from the above process, the circumferential position of the sealing cap 630 is restricted by the positioning hole 634 and the elongated positioning groove 102, and the axial position is restricted by the positioning ring 610. Therefore, the position of the laser transmission line 320 and the transmission rod 220 mounted to the sealing cap 630 is also restricted. Furthermore, during the installation process, the sealing cap 630 does not rotate. In other words, during the installation process, the transmission rod 220 and the laser transmission line 320 do not rotate, but only move axially. This prevents damage to the transmission rod 220 due to torsional forces and prevents entanglement of the laser transmission line 320 due to rotation.

[0083] like Figure 17 As shown, the sealing cap body 631 can enhance the sealing performance between the gun barrel 100 and the gun barrel 100 through the first sealing ring 650. The bottom wall of the sealing cap body 631 can be provided with a groove for mounting the first sealing ring 650. After installation, the wall of the rear end of the gun barrel 100 abuts against the first sealing ring 650, and together with the sealing cap body 631, the first sealing ring 650 is pressed, thereby sealingly connecting the sealing cap body 631 to the gun barrel 100.

[0084] The sealing cap body 631 can be sealed and connected to the transmission rod 220 by the second sealing ring 660. A groove for installing the second sealing ring 660 is provided on the wall of the transmission rod locating hole 632. To further increase the sealing effect, a plurality of second sealing rings 660 can be provided. As described above, the transmission rod 220 repeats linear motion in the motion process of driving the reflector frame 400. Therefore, in order to provide lubrication for the transmission rod 220, the transmission rod locating hole 632 can be provided with a lubricant cavity 6321 between the second sealing rings 660. Since the lubricant cavity 6321 is provided with the second sealing ring 660 on both sides, the lubricant 690 will not flow into the gun barrel 100 and will not leak. The lubricant 690 liquid level in the lubricant cavity 6321 can be higher than the transmission rod 220, thereby can play a sealing role. The gas that may exist in the gun barrel 100 is blocked by the second sealing ring 660 and the lubricant 690, thereby can not leak to the outside world. In order to facilitate the addition of lubricant 690, the sealing cap body 631 can also be provided with an injection hole 6322 that communicates with the outside and the lubricant cavity 6321. The injection hole 6322 can be sealed by an injection hole cover 680. Figure 18-19 As shown, the injection hole cover 680 may include an injection hole upper cover 681, a spring 682 and an injection hole lower cover 683. The injection hole upper cover 681 may be threaded or snap-fitted to the oil injection hole. The spring 682 is located between the injection hole upper cover 681 and the injection hole lower cover 683, and pushes the injection hole lower cover 683 toward the lubricant 690 through elastic force, providing a certain pressure in the lubricant cavity 6321. This design is similar to an injection tube, pushing the lubricant 690 through the injection hole lower cover 683 so that the lubricant 690 wraps around the transmission rod 220 at this position, thereby increasing the lubrication effect. In order to increase the sealing effect and prevent the lubricant 690 from leaking, the injection hole lower cover 683 is also provided with a third sealing ring 684 for sealing the gap between the side wall of the injection hole lower cover 683 and the lubricant cavity 6321.

[0085] The sealing cap body 631 can be sealed and connected to the laser transmission line 320 through the sealing sleeve 670. The sealing sleeve 670 can be cylindrical, at least a portion of which is interference-connected with the laser transmission line mounting hole 633, and has a through hole 671 that allows the laser transmission line 320 to pass through. The laser transmission line 320 can be interference-connected with the through hole 671. To facilitate the installation of the injection hole cover 681, as shown in FIG. Figure 20 As shown, a slot 6811 may be provided at the top of the injection hole cover 681. To prevent the spring 682 from shifting between the injection hole cover 681 and the injection hole lower cover 683, the injection hole cover 681 or / and the injection hole lower cover 683 may also be provided with an accommodating groove 6831 for accommodating the end of the spring 682. Figure 21 The receiving groove 6831 of the injection hole lower cover 683 is shown.

[0086] The tail end seal assembly 600 , together with the mounting base 500 described above, forms a support and sealing structure for various components within the barrel 100 .

[0087] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A laser gun for a laser scanning device, characterized in that: include: an elongated gun barrel extending in a length direction and having a head end and a tail end opposite to each other along the length direction, wherein the tail end has an open tail end; A tail end sealing assembly, used for sealing the opening of the tail end of the gun barrel; a laser transmission line for transmitting laser light, which extends through the tail end sealing assembly into the gun barrel and extends along the gun barrel toward the head end thereof; A transmission rod, which passes through the tail end sealing assembly and extends into the gun barrel, and is used to be operably connected to the reflector frame to drive the reflector frame to rotate; wherein, The tail end sealing assembly includes: a positioning ring which is sleeved outside the gun barrel and detachably connected to the outer wall of the gun barrel; A sealing cap connected to the open rear end of the gun barrel comprises a sealing cap body; the sealing cap body is provided with a bottom wall and an annular side wall connected to the bottom wall; the outer wall of the annular side wall of the sealing cap is provided with a thread, and the annular side wall of the sealing cap surrounds the outer wall of the gun barrel; the bottom wall of the sealing cap has a contact surface against the open rear end of the gun barrel, a laser transmission line mounting hole for allowing the laser transmission line to pass through, and a transmission rod positioning hole for allowing the transmission rod to pass through; a positioning member, used for maintaining the relative position between the gun barrel and the sealing cap; The locking nut is provided with a bottom wall and an annular side wall connected to the bottom wall; the bottom wall of the locking nut is provided with a through hole allowing the gun barrel to pass through, and also has a contact surface abutting against the positioning ring; the inner wall of the annular side wall of the locking nut is provided with a thread; wherein, by rotating the locking nut, it is threadedly connected to the outer wall of the sealing cap.

2. The laser gun for a laser scanning device according to claim 1, characterized in that: The positioning ring is threadedly connected to the outer wall of the gun barrel.

3. The laser gun for a laser scanning device according to any one of claims 1-2, characterized in that: The relative positions of the positioning ring and the gun barrel are fixed by a top screw.

4. The laser gun for a laser scanning device according to claim 1, characterized in that: A positioning hole is provided on the annular side wall of the sealing cap body; an elongated positioning groove is provided along the axial direction of the gun barrel near its rear end portion; the positioning piece is a bolt, a screw or a top screw; one end of the positioning piece passes through the positioning hole and enters the positioning groove; under the action of the positioning piece and the positioning hole, the sealing cap body can only move along the axial direction of the gun barrel, and cannot rotate along the circumferential direction.

5. The laser gun for a laser scanning device according to claim 1, characterized in that: After the sealing cap body moves to a predetermined position along the axial direction of the gun barrel, the positioning member is used to press the sealing cap body between the sealing cap body and the gun barrel.

6. The laser gun for a laser scanning device according to claim 1, characterized in that: It also includes a first sealing ring, and the bottom wall of the sealing cap body is provided with a groove for installing the first sealing ring.

7. The laser gun for a laser scanning device according to claim 1, characterized in that: The transmission rod is sealed and connected to the transmission rod positioning hole, and the laser transmission line is sealed and connected to the laser transmission line mounting hole.

8. The laser gun for a laser scanning device according to claim 1, characterized in that: It also includes at least one second sealing ring; the transmission rod positioning hole is provided with a groove for installing the second sealing ring.

9. The laser gun for a laser scanning device according to claim 1, characterized in that: It also includes at least two second sealing rings; the transmission rod positioning hole is provided with a groove for installing the second sealing ring; the transmission rod positioning hole is provided with a lubricant cavity for containing lubricant between any two grooves.

10. The laser gun for a laser scanning device according to claim 9, characterized in that: The liquid level of the lubricant contained in the lubricant cavity is higher than the transmission rod.

11. The laser gun for a laser scanning device according to claim 10, characterized in that: The transmission rod positioning hole is provided with an injection hole communicating with the outside and the lubricant cavity.

12. The laser gun for a laser scanning device according to claim 11, characterized in that: It also includes a filling hole cover for sealing the filling hole; the filling hole cover includes: an filling hole upper cover, a spring and a filling hole lower cover; wherein, the filling hole upper cover is threaded or clamped with the oil filling hole; the spring is located between the filling hole upper cover and the filling hole lower cover, and pushes the filling hole lower cover to move toward the lubricant through elastic force.

13. The laser gun for a laser scanning device according to claim 12, characterized in that: It also includes a third sealing ring, and the side wall of the injection hole lower cover is provided with a groove for installing the third sealing ring.

14. The laser gun for a laser scanning device according to claim 13, characterized in that: The top of the injection hole upper cover is provided with a slot.

15. The laser gun for a laser scanning device according to claim 14, characterized in that: The injection hole upper cover and / or the injection hole lower cover are provided with an accommodating groove for accommodating the end of the spring.

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