A laser gun for a laser scanning device and a connection structure

Abstract

The present application relates to a laser gun for a laser scanning device and a connection structure. The laser gun includes: a barrel, a through groove penetrating the barrel wall is formed in the barrel wall; a mounting seat, arranged inside the barrel and used for mounting and holding one or more components; a keyway is formed in the mounting seat, and a first through hole is formed in the keyway; a key, which can be fixedly connected to the mounting seat, and the shape of the key matches the shape of the through groove and is held in the through groove, and a part of the key also extends into the keyway; the key has a second threaded through hole, which is substantially aligned with the first through hole; a threaded fastener, used for key connection to the mounting seat, and a joint for engaging a screwing tool is formed at the second end; the threaded fastener is held in the first through hole, and the second end extends out of the first through hole towards the direction of the barrel. The present application also relates to a general connection structure for holding a second component inside a cylindrical first component.

Description

Technical Field

[0001] This application relates to optical instruments or systems, and particularly to a laser gun for a laser scanning device. This application also relates to a connection structure for connecting two components. Background Art

[0002] Enclosed industrial furnaces such as blast furnaces have an in-furnace environment with high temperature, high pressure, high dust, etc. Therefore, it is difficult to observe through an observation window with the human eye. For this reason, various detection devices have been proposed to obtain in-furnace information, such as infrared imaging, microwave scanning, laser scanning, etc.

[0003] Chinese Patent Application No. 2024111313696 proposes a laser scanning device, which may include a laser gun and a jacket tube into which it is inserted. The laser scanning device can be installed on an industrial furnace such as a blast furnace, with its head end extending into the furnace and its tail end located outside the furnace, and the laser emitted from the head end can be scanned inside the furnace to obtain in-furnace information. The laser gun is used to transmit the laser generated by a laser generator outside the furnace into the furnace. The jacket tube can protect the laser gun to adapt it to the harsh in-furnace environment, and the jacket tube can also provide other auxiliary and support functions. In one embodiment of the laser gun, a laser transmission line extends within the elongated barrel of the laser gun and is used to transmit the laser. After being collimated by a collimating mirror, it is reflected into the furnace by a reflecting mirror. The reflecting mirror frame with the reflecting mirror is driven to rotate by a motor drive assembly to perform a scanning operation within a predetermined scanning angle range. This application relates to changes and / or improvements to the laser scanning device in Chinese Patent Application No. 2024111313696. Therefore, the entire content of this Chinese patent application is hereby incorporated into this specification by reference. Summary of the Invention

[0004] According to a first aspect, the present application provides a laser gun for a laser scanning device. The laser gun may include: an elongated barrel that extends along a length direction and has a head end and a tail end opposite to each other along its length direction; a through groove formed in the barrel wall of the barrel, the through groove penetrating the barrel wall; a mounting seat disposed in the barrel and for mounting and holding one or more components; the mounting seat forms a key groove recessed inward from its outer surface at a position corresponding to the through groove of the barrel, and a first through hole is formed in the key groove; a key that can be fixedly connected to the mounting seat, and the shape of the key matches the shape of the through groove of the barrel and is held in the through groove, and a part of the key also extends into the key groove of the mounting seat; the key has a second threaded through hole that is substantially aligned with the first through hole; a threaded fastener for connecting the key to the mounting seat, the threaded fastener has opposite first and second ends, and a engaging portion for engaging a screwing tool is formed at the second end; the threaded fastener is held in the first through hole of the mounting seat, and the second end extends out of the first through hole towards the barrel direction.

[0005] During assembly, outside the barrel, align the second threaded through hole of the key with the second end of the threaded fastener, and pass the screwing tool through the second threaded through hole of the key to engage the engaging portion of the threaded fastener; use the engaging portion of the screwing tool to screw the threaded fastener, so that the threaded fastener is gradually screwed into the second threaded through hole of the key and forms a threaded connection with the second threaded through hole.

[0006] Optionally, at least a part of the outer circumferential profile of the mounting seat matches the inner circumferential profile of the barrel wall of the barrel to substantially prevent the mounting seat from moving laterally in the barrel in a direction perpendicular to the length direction of the barrel.

[0007] Optionally, in the assembled state, the part of the key substantially extends through the entire depth of the key groove.

[0008] Optionally, in the assembled state, the outer surface of the key is substantially flush with or recessed from the outer surface of the barrel.

[0009] Optionally, the length of the threaded fastener is set such that in the assembled state, the second end of the threaded fastener is substantially flush with or recessed from the outer surface of the barrel.

[0010] Optionally, the length of the threaded fastener is set such that in the assembled state, the second end of the threaded fastener is substantially flush with the outer circumferential profile of the mounting seat.

[0011] Optionally, the threaded fastener has a fastener head and a threaded fastener shank, the fastener head having an increased size relative to the fastener shank, the fastener head forming the first end of the threaded fastener, and the end portion of the fastener shank being formed as the second end of the threaded fastener; the first through hole has a flared section and a constricted section along its extending direction, the transverse dimension of the flared section being greater than that of the constricted section; a stepped portion is formed between the transitions of the flared section and the constricted section, and the fastener head of the threaded fastener can be received within the flared section; the fastener shank of the threaded fastener extends through the constricted section of the first through hole.

[0012] Optionally, the laser gun further includes a retainer, which is connected to the mounting base and extends transversely relative to the first through hole outside or inside the first through hole to hold the threaded fastener within the first through hole.

[0013] Optionally, the key and the through slot are elongated and extend along the length direction of the barrel.

[0014] Optionally, the laser gun further includes: a laser transmission line for transmitting laser, which extends from outside the barrel into the barrel and extends along the barrel towards its head end; a collimating mirror, disposed within the barrel and optically connected to the head end of the laser transmission line; a reflecting mirror frame with a reflecting mirror, disposed within the barrel and adjacent to the collimating mirror; and a transmission rod, which extends from outside the barrel into the barrel and is operably connected to the reflecting mirror frame for driving the reflecting mirror frame to rotate; wherein, the mounting base has a collimating mirror mounting portion for holding the collimating mirror and a reflecting mirror frame mounting portion for holding the reflecting mirror frame.

[0015] Optionally, the mounting base has a connecting portion located between the collimating mirror mounting portion and the reflecting mirror frame mounting portion, and the key slot is formed in the connecting portion.

[0016] Optionally, the collimating mirror mounting portion includes a collimating mirror receiving hole for receiving the collimating mirror and at least one setscrew through hole for receiving a setscrew, the setscrew through hole penetrating from the outer surface of the collimating mirror mounting portion into the collimating mirror receiving hole so that the setscrew can penetrate into the collimating mirror receiving hole to press against the collimating mirror to fix the collimating mirror.

[0017] Optionally, the collimating mirror mounting portion is formed with a first transmission rod through hole allowing the transmission rod to pass through, and the reflecting mirror frame mounting portion is formed with a second transmission rod through hole allowing the transmission rod to pass through; wherein, the first transmission rod through hole and the second transmission rod through hole are coaxially arranged along the same straight line parallel to the length direction of the barrel.

[0018] Optionally, the reflecting frame mounting portion includes an end wall portion, and a first side wall and a second side wall extending from the end wall portion; the reflecting frame is rotatably disposed between the first side wall and the second side wall.

[0019] Optionally, the laser gun further includes a slider connected to the transmission rod, the slider is disposed between the first side wall and the second side wall, and the reflecting frame is rotatably connected to the slider, and the transmission rod drives the reflecting frame to rotate through the slider.

[0020] Optionally, sliding grooves for supporting the slider are respectively formed on inner surfaces of the first side wall and the second side wall of the reflecting frame mounting portion, and the slider can linearly move along the length direction of the gun barrel on the sliding grooves.

[0021] Optionally, the slider is substantially in a gate shape, and two side walls of the slider are respectively slidably supported on the first side wall and the second side wall of the reflecting frame mounting portion; the reflecting frame is rotatably connected to the slider between the two side walls of the slider.

[0022] According to a second aspect, the present application provides a connection structure for connecting a first member and a second member. The connection structure may include: a cylindrical first member, a through groove is formed in a cylindrical wall of the first member, and the through groove penetrates through the cylindrical wall; a second member, disposed inside the first member and having a first through hole, the first through hole is exposed in the through groove of the first member; a key, which can be fixedly connected to the mounting seat, and a shape of the key matches a shape of the through groove of the first member and is held in the through groove, the key has a second threaded through hole, and the second threaded through hole is substantially aligned with the first through hole; a threaded fastener for connecting the key to the mounting seat, the threaded fastener has opposite first and second ends, and a joint portion for engaging a screwing tool is formed at the second end; the threaded fastener is held in the first through hole of the second member, and the second end extends out of the first through hole towards the direction of the first member; wherein, during assembly, outside the first member, the second threaded through hole of the key is aligned with the second end of the threaded fastener, and the screwing tool passes through the second threaded through hole of the key to engage the joint portion of the threaded fastener; the screwing tool uses the joint portion to screw the threaded fastener, so that the threaded fastener is gradually screwed into the second threaded through hole of the key and forms a threaded connection with the second threaded through hole.

[0023] Optionally, at least a part of the outer circumferential profile of the second member matches the inner circumferential profile of the cylindrical wall of the first member to substantially prevent lateral movement of the second member within the first member.

[0024] Optionally, with the threaded fastener held within the first through-hole, the second member is inserted into the first member along the length direction of the first member; the length of the threaded fastener is set to be substantially flush with or recessed relative to the outer circumferential profile of the second member in the held state.

[0025] Optionally, the connection structure further includes a retaining member that is connected to the second member and extends laterally relative to the first through-hole outside or inside the first through-hole to hold the threaded fastener within the first through-hole.

[0026] Optionally, the threaded fastener has a fastener head and a threaded fastener shank, the fastener head has an increased size relative to the fastener shank, the fastener head forms the first end of the threaded fastener, and the end portion of the fastener shank is formed as the second end of the threaded fastener; the first through-hole has a flared section and a constricted section along its extending direction, the lateral dimension of the flared section is larger than the lateral dimension of the constricted section; a step portion is formed between the transition of the flared section and the constricted section, and the fastener head of the threaded fastener can be received within the flared section; the fastener shank of the threaded fastener extends through the constricted section of the first through-hole.

[0027] Optionally, the second member has a keyway formed by being recessed inward from its outer surface, and the first through-hole communicates with the bottom of the keyway; wherein, in the assembled state, a part of the key extends into the keyway.

[0028] Optionally, in the assembled state, the part of the key substantially extends through the entire depth of the keyway.

[0029] Optionally, in the assembled state, the outer surface of the key is substantially flush with or recessed relative to the outer surface of the first member.

[0030] Optionally, the length of the threaded fastener is set such that the second end of the threaded fastener is substantially flush with or recessed relative to the outer surface of the first member in the assembled state.

[0031] Optionally, the key and the through-slot are elongated and extend along the length direction of the cylindrical first member. Description of the Drawings

[0032] Figure 1Shows an embodiment of the laser gun for a laser scanning device of the present application;

[0033] Figure 2 is Figure 1 a perspective view of the reflection frame in

[0034] Figure 3 is Figure 1 a perspective view of the mounting base in

[0035] Figure 4 is Figure 3 a perspective view of the shown mounting base as seen from another upward-looking angle;

[0036] Figure 5 Shows Figure 3 the mounting base in

[0037] Figure 6 and the slider and transmission rod mounted to the mounting base;

[0038] Figure 7 Shows Figure 6 the structure shown has been arranged in place in the gun barrel, and the mounting base and the gun barrel are to be connected by a key;

[0039] Figure 8 is a schematic diagram of the projection position relationship in the vertical direction of the gun barrel, the mounting base and the key;

[0040] Figure 9 is a partial transverse sectional schematic diagram of the assembled laser gun;

[0041] Figure 10 is a partial longitudinal sectional schematic diagram of the assembled laser gun;

[0042] Figure 11 is a partial bottom view of the assembled laser gun;

[0043] Figure 12 is a schematic diagram of the assembly of the mounting base and the key after ignoring the gun barrel;

[0044] Figure 13 is Figure 1 a partial enlarged view of the tail end of the shown laser gun;

[0045] Figure 14 is a perspective view of the outer wall of the gun barrel;

[0046] Figure 15 is Figure 13 a first installation schematic diagram of the tail end seal assembly at the tail end of the shown laser gun, with the sealing ring and the sealing sleeve hidden;

[0047] Figure 16Yes Figure 13 The second installation schematic diagram of the tail-end sealing assembly at the tail end of the laser gun shown

[0048] Figure 17 Yes Figure 13 The first installation schematic diagram of the tail-end sealing assembly at the tail end of the laser gun shown, which shows the sealing ring and the sealing sleeve;

[0049] Figure 18 Yes Figure 13 The schematic diagram after installing the injection hole cover on the tail-end sealing assembly at the tail end of the laser gun shown;

[0050] Figure 19 Yes Figure 18 The schematic diagram after disassembling the injection hole cover shown;

[0051] Figure 20 Yes Figure 19 The perspective view of the upper injection hole cover shown;

[0052] Figure 21 Yes Figure 19 The perspective view of the lower injection hole cover shown. Detailed implementation manners

[0053] The technical solutions provided by the present invention will be further described below in conjunction with embodiments. In these drawings, the same or similar components are denoted by the same or similar reference numerals.

[0054] As Figure 1 shown, the laser gun can be used in a laser scanning device and can include a long gun barrel 100. The gun 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 its length direction or axial direction. For the sake of simplicity of description, in the following, Figure 1 the left end in

[0055] will be referred to as the tail end, and the right end will be referred to as the head end. The laser transmission line 320 can extend from the outside of the gun barrel 100 into the gun barrel 100 and extend along the gun barrel 100 towards its head end. The laser generated by the laser generator 310 outside the gun barrel 100 can be transmitted to the required position by the laser transmission line 320. The laser transmission line 320 can include one or more optical fibers. A collimating mirror 330 that is mechanically and optically connected to the head end of the laser transmission line 320 can also be arranged inside the gun barrel 100, for receiving the laser from the laser transmission line 320 and collimating and outputting it.

[0056] The reflection frame 400 can be arranged inside the gun barrel 100 and can be arranged adjacent to the collimating mirror 330. In Figure 2It can be seen more clearly in [reference number]. The reflecting mirror frame 400 can carry a reflecting mirror M. In this way, the laser beam from the collimator 330 can be reflected by the reflecting mirror M.

[0057] Return Figure 1 , the reflecting mirror frame 400 can be driven by the motor drive assembly 200 to rotate. The motor drive assembly 200 can include a motor 210 and a transmission rod 220. The transmission rod 220 can extend from the outside of the barrel 100 into the barrel 100 and extend along the barrel 100 towards its head end. The transmission rod 220 can be operably connected to the reflecting mirror frame 400 and the motor 210 respectively. The motor 210 can drive the transmission rod 220 to move linearly, and drive the reflecting mirror frame 400 and the reflecting mirror M carried thereon to rotate about the axis A through the linear movement of the transmission rod 220.

[0058] Near the head end of the barrel 100, the collimator 330, the reflecting mirror frame 400, and the transmission rod 220 can be held in the barrel 100 by the mounting seat 500, which will be described in detail later. At the tail end of the barrel 100, the tail end seal assembly 600 can hermetically support the transmission rod 220 and the laser transmission line 320, which will be described in detail in the last part of the specification.

[0059] Figure 2 is a specific example of the reflecting mirror frame 400 equipped with the reflecting mirror M. As described above in conjunction with Figure 1 , the motor drive assembly 200 can drive the reflecting mirror frame 400 to rotate about the axis A. For this purpose, the reflecting mirror frame 400 can be formed with a shaft hole 410, and the shaft hole 410 can penetrate the reflecting mirror frame 400 along the axis A. In the assembled state, a shaft (not shown) can pass through the shaft hole 410, and both ends of the shaft can be respectively held at the Figure 1 shown mounting seat 500. The reflecting mirror frame 400 can also be formed with a pin hole 420, and the pin hole 420 can penetrate the reflecting mirror frame 400 along a direction parallel to the axis A. In the assembled state, a pin (not shown) can pass through the pin hole 420 and be operably connected to the transmission rod 220 of the motor drive assembly 200. In this way, during operation, when the transmission rod 220 of the motor drive assembly 200 moves linearly, the reflecting mirror frame 400 can be pushed or pulled to rotate about the rotation axis A defined by the shaft hole 410 by means of the pin hole 420. In some embodiments, the shaft hole 410 and / or the pin hole 420 may not penetrate the entire reflecting mirror frame 400, but are respectively formed as blind holes at corresponding positions on both sides of the reflecting mirror frame 400. The shaft or pin inserted into 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 respectively.

[0060] In combination with Figure 1 andFigure 2 It can be seen that during operation, the laser generated by the laser generator 310 can be output via the laser transmission line 320 and the collimating mirror 330 and incident on the mirror M carried by the reflection frame 400; the mirror M can receive and reflect the incident laser. The outgoing laser formed by the reflection of the mirror M will be emitted at multiple different angles along with the rotation of the reflection frame 400 and is emitted to the outside of the barrel 100 through the light-emitting slit or notch 103 formed in the end wall and / or side wall at the head end of the barrel 100, so as to perform laser scanning operations within a predetermined scanning angle range. The reflection frame 400 can rotate in a plane around the axis A, and this plane can be, for example, a plane perpendicular to the axis A (i.e., Figure 1 the plane of the paper where this figure is located in the drawing), which is also called the scanning plane.

[0061] The inventors of the present application found that due to the relatively small internal space of the long barrel-shaped structure of the barrel 100, it is difficult to separately install the collimating mirror 330 and the reflection frame 400 into the barrel 100, and it is also difficult to ensure the alignment among the collimating mirror 330, the mirror M of the reflection frame 400, and the light-emitting slit or notch 103 on the barrel wall of the barrel 100. The inventors of the present application also found that when a certain component is fixedly installed in the barrel 100, due to the relatively small internal space of the long barrel-shaped structure of the barrel 100, the conventional idea is to use fasteners such as screws from the outside of the barrel 100 to pass through the barrel wall of the barrel 100 and screw the component together with the barrel 100. However, since the laser gun is often inserted into an outer sleeve during operation (this can be referred to Chinese Patent Application No. 2024111313696), when the fasteners such as screws become loose, they may fall into the space between the laser gun and the outer sleeve. In this way, when it is necessary to pull out the laser gun from the outer sleeve for maintenance, it may be stuck by the screws and cannot be pulled out normally.

[0062] To this end, the inventors of the present application have made a delicate design on the structure of the mounting base 500 itself and the connection structure between the mounting base 500 and the barrel 100 to avoid the foregoing adverse situations. As will be understood from the following description, the collimator 330 and the reflection frame 400 of the present application are mounted and held at the same mounting base 500, so that the mounted collimator 330 and reflection frame 400 can be pre-aligned substantially through the shape and position design of the mounting part of the mounting base 500 itself. Before the mounting base 500 is placed into the barrel 100, the collimator 330, the reflection frame 400 and the transmission rod 220 can be mounted thereon, and the assembled structure can be integrally inserted into the barrel 100. Since this mounting process is carried out outside the barrel 100, it can be conveniently performed without being restricted by the narrow internal space of the barrel 100. Then, for the mounting base 500 that has been inserted into the barrel 100, the mounting base 500 can be connected to a predetermined position of the barrel 100 outside the barrel 100, and this connection method does not pose a risk of parts falling out of the barrel 100. In this way, not only the installation difficulty caused by the narrow internal space of the barrel 100 is overcome, but also the alignment between related components can be ensured, and it can also be ensured that there will be no pulling obstacles caused by part dropping between the barrel 100 and the outer sleeve where it is located. Those skilled in the art can understand that in some embodiments, only a part of the above-mentioned multiple technical means can be adopted to achieve the effects corresponding to this part of the technical means.

[0063] Figure 3 and Figure 4 show an embodiment of the mounting base 500 from different perspectives. In Figure 5 it is shown that the transmission rod 220 and the slider 540 have been mounted to the mounting base 500, and in Figure 6 it is shown that the collimator 330 and the reflection frame 400 have been mounted to the mounting base 500.

[0064] As Figures 3 to 6 shown, the mounting base 500 can extend along a length direction and has 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 collimator mounting portion 510 at its tail end and a reflection frame mounting portion 530 at its head end. The collimator mounting portion 510 is used to mount and hold the collimator 330, and the reflection frame mounting portion 530 is used to mount and hold the reflection frame 400. A connection portion 520 can be provided between the collimator mounting portion 510 and the reflection frame mounting portion 530.

[0065] The collimator mounting portion 510 may have a first transmission rod through-hole 511 allowing the transmission rod 220 to pass through, and a collimator receiving hole 512 for receiving the collimator 330. The collimator receiving hole 512 may be located below the first transmission rod through-hole 511. The collimator mounting portion 510 may further have a setscrew through-hole 513 penetrating from the outer surface of the collimator mounting portion 510 to the collimator receiving hole 512. The setscrew through-hole 513 may be formed with threads. When mounting the collimator 330, the collimator 330 may be inserted into the collimator receiving hole 512, and then a setscrew (not shown) may be screwed into the setscrew through-hole 513 until it presses against the collimator 330, so that the collimator 330 is fixedly held in the receiving hole 512. Especially in Figure 4 it can be seen that the collimator mounting portion 510 may be provided with a plurality of setscrew through-holes 513 at a plurality of different positions, such as at the side wall and the bottom wall, so that the position of the collimator 330 in the collimator receiving hole 512 can be finely adjusted by adjusting the screwing depth of the setscrew in different directions. In other embodiments, the collimator 330 may also be held in the collimator receiving hole 512 by other means, such as snap connection.

[0066] The reflecting 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 barrel 100. The end wall portion 530A may be formed therein with a second transmission rod through-hole 531 allowing 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 barrel 100 to constrain the transmission rod 220 inserted therein to move in a straight line in a predetermined straight line direction. The end wall portion 530A may further be formed therein with a light-transmitting hole 532, and the light-transmitting hole 532 may be located below the second transmission rod through-hole 531. The light-transmitting hole 532 is on the optical path of the laser emitted by the collimator 330 in the collimator receiving hole 512 to allow the laser emitted by the collimator 330 to pass through the light-transmitting hole 532 and be incident on the reflecting mirror M carried by the reflecting frame 400.

[0067] The first side wall 530B and the second side wall 530C may be mirror-symmetrical and may form a narrow channel therebetween for receiving the reflecting frame 400. The reflecting frame 400 may be rotatably arranged between the first side wall 530B and the second side wall 530C and is 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 reflecting frame mounting holes 533 extending in the direction of the axis A. The position and size of the reflecting frame mounting holes 533 may be the same as Figure 2is fitted with the shaft hole 410 of the reflection frame 400 to allow the rotation shaft 592 (see Figure 7 ) to be inserted into the reflection frame mounting hole 533 and extend all the way into the shaft hole 410, so that the reflection frame 400 can rotate around the rotation shaft 592 or the axis A. The rotation shaft 592 can be a single shaft passing through the first side wall 530B and the second side wall 530C, or two half shafts passing through the first side wall 530B and the second side wall 530C respectively from both sides.

[0068] The slider 540 can be fixedly connected to the drive rod 220, for example, in a threaded connection, at the head end of the drive rod 220 and can move linearly with the drive rod 220. The slider 540 can be rotatably connected to the reflection frame 400, and the drive rod 220 can drive the reflection frame 400 to rotate through the slider 540, which will be described below. Slideways 534 can be respectively formed on the inner surfaces of the first side wall 530B and the second side wall 530C along the length direction of the barrel 100 or the mounting seat 500. The slider 540 can be located in the narrow channel between the first side wall 530B and the second side wall 530C and can be supported by the slideways 534. In this way, under the push of the drive rod 220, the slider 540 can reciprocate linearly along the length direction of the barrel 100 on the slideways 534, thereby driving the reflection frame 400 to rotate. By supporting the slider 540 by the slideways 534, the stability of the linear motion of the drive rod 220 and the slider 540 is improved. The slider 540 can have a cross-section that is substantially "door"-shaped, and the two side walls can respectively abut against the slideways 534 of the first side wall 530B and the second side wall 530C so as to be slidably supported.

[0069] As Figure 6 shown, the reflection frame 400 can be rotatably connected to the slider 540 between the two side walls of the door-shaped slider 540. This can be particularly referred to Figure 7 , in the area indicated by the reference numeral 591, the slider 540 has a vertically extending long hole, and a pin passes through the long hole and extends into Figure 2 the pin hole 420 of the reflection frame 400 shown. In this way, when the slider 540 moves linearly laterally with the drive rod 220, the pin can push or pull the reflection frame 400 to rotate, and the pin will move relatively vertically in the long hole of the slider 540. The two outer ends of the pin can be kept between the first side wall 530B and the second side wall 530C of the reflection frame mounting portion 530 without falling out.

[0070] As described above, a connecting portion 520 may be provided between the collimator mounting portion 510 and the reflecting frame mounting portion 530 of the mounting base 500. The collimator mounting portion 510 and the reflecting frame mounting portion 530 are fixedly connected to the connecting portion 520 or integrally formed with the connecting portion 520 at two end portions of the connecting portion 520, respectively. The connecting portion 520 may be entirely located at the lower part of the mounting base 500 to avoid the outgoing light path of the collimator 330. Since both the collimator 330 and the reflecting frame 400 are mounted at the same mounting base 500, in this way, by pre-designing the mounting positions of the collimator 330 and the reflecting frame 400 at the mounting base 500, they can be easily aligned.

[0071] The circumferential outer contour of the mounting base 500 may partially or entirely match the inner wall shape or inner circumferential contour of the barrel wall of the gun barrel 100, so that the mounting base 500 can move along the length direction of the gun barrel 100 and / or rotate circumferentially within the gun barrel 100, but there is basically no movement or shaking in the lateral direction perpendicular to the length direction of the gun barrel. The circumferential outer contour or the circumferential outer contour mentioned here refers to the overall circumferential outer contour when looking at the mounting base 500 from its end face, rather than restricting the circumferential outer contour at individual positions along its length direction. Each position of the mounting base 500 along its length direction may have different shapes and contours. For example, when the gun barrel 100 is cylindrical, the circumferential outer contour of the mounting base 500 may be circular, and its diameter may be slightly smaller than the inner diameter of the gun barrel 100, but different parts of the mounting base 500 may have different shapes. The outer contour of the end wall portion 530A of the reflecting frame mounting portion 530 may be circular; the outer contours of the first side wall 530B and the second side wall 530C of the reflecting frame mounting portion 530 are two arcs that are opposite and spaced apart along a diameter; the outer contours of the top and bottom of the collimator mounting portion 510 may also be two arcs that are opposite and spaced apart along a diameter, but the arrangement directions of the two arcs formed by these two arcs and the outer surfaces of the first side wall 530B and the second side wall 530C are basically perpendicular. Although there may be different outer contours at different positions, the overall circumferential outer contour of the mounting base 500 forms a circle. At the same time, it can be understood that in other embodiments, only a part of the overall circumferential outer contour of the mounting base 500 may match the inner circumferential contour of the barrel wall of the gun barrel 100. At this time, the mounting base 500 can still move along the length direction of the gun barrel 100 and / or rotate circumferentially within the gun barrel 100, but there is basically no movement or shaking in the lateral direction perpendicular to the length direction of the gun barrel. This can refer to the outer contour of the collimator mounting portion 510 or the outer contours of the first side wall 530B and the second side wall 530C.

[0072] The matching of the circumferential outer contour of the mounting base 500 described above with the inner circumferential contour of the barrel wall of the barrel 100 is important for the connection stability and convenience between the mounting base and the barrel 100 described below.

[0073] After mounting the respective components to be borne by the mounting base 500 to the predetermined positions of the mounting base 500, substantially as Figure 6 shown, and then insert them together into the predetermined position within the barrel 100, as Figure 7 shown. After arranging the mounting base 500 within the barrel 100, the connecting portion 520 of the mounting base 500 can be non-rotatably connected to the barrel 100 by means of a key 560.

[0074] To more clearly understand the connection structure between the mounting base 500 and the barrel 100, Figure 8 the barrel 100, the mounting base 500, the key 560, etc. involved in this connection structure are separately shown, and the mounting base 500 is translated vertically to the outside of the barrel 100, but the horizontal positional relationship of each component is kept unchanged. It should be understood that in the actual assembled state, the mounting base 500 is located within the barrel 100. As Figure 8 shown, the barrel wall of the barrel 100 can be formed with a through groove 110 that penetrates the barrel wall of the barrel 100. The connecting portion 520 of the mounting base 500 can be formed with a key groove 522 that is 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 that communicates with the key groove 522 and penetrates the connecting portion 520 can 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 can also be seen in Figure 4 The key groove 522 and the through groove 110 can jointly form a receiving space 560' for receiving the key 560, which can be seen in Figure 7. The shape of the key 560 matches the shape of the through slot 110 of the barrel 100. In the assembled state, the key 560 can be stably held within the through slot 110. The key 560 may have a second threaded through hole 561 which, in the assembled state, is substantially aligned with the first through hole 521 to receive the threaded fastener 550. The threaded fastener 550 can be screwed through the first through hole 521 into the second threaded through hole 561 to form a threaded connection therewith, thereby fixedly connecting the key 560 and the mounting seat 500 to each other. During the process of connecting the key 560, a part of the key 560 extends into the key slot 522 of the mounting seat 500. Since the key 560 is fixedly connected to the mounting seat 500 and the key 560 is held by the through slot 110 of the barrel 100, therefore, by means of the shape fit between the key 560 and the through slot 110, the mounting seat 500 cannot move along the length direction of the barrel 100 and cannot rotate circumferentially relative to the barrel 100. At the same time, due to the movement limitation of the mounting seat 500 by the key 560, combined with the description of the outer contour of the mounting seat 500 and the inner contour of the barrel 100 and the contour fit therebetween for restricting the lateral movement of the mounting seat 500 relative to the barrel 100, the mounting seat 500 can be stably held within the barrel 100.

[0075] Figure 7 shows the state after the mounting seat 500 is inserted into the barrel 100 but before the key 560 is installed. At this time, the key slot 522 of the mounting seat 500 is aligned with the through slot 110 of the barrel 100 to jointly form a receiving space 560' for preparing to receive the key 560. The threaded fastener 550 has been disposed within the first through hole 521 and extends into the receiving space 560' waiting to be screwed into the second threaded through hole 561 of the key 560.

[0076] Figure 9 and Figure 10 are respectively a partial cross-sectional schematic view and a partial longitudinal-sectional schematic view of the laser gun after assembly. As Figure 9 and Figure 10 shows, the threaded fastener 550 may have an enlarged fastener head 551 and a threaded fastener shank 552. 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 particularly 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 a conventional fastener. For a conventional fastener with an enlarged head, its engaging portion is usually formed at its enlarged head rather than at its thinner end. In Figure 9In [the above], the engaging portion 5522 of the threaded fastener 550 is a flat groove, which is suitable for receiving a flat screwdriver. In other embodiments, the engaging portion may also be in the form of various groove types such as a Phillips recess or a hex socket, or protrusions of various shapes, as long as it can cooperate with a screwing tool to rotate the threaded fastener 550. Combining Figure 8 and Figure 9 It can be seen that the first through hole 521 of the connecting portion 520 of the mounting seat 500 may have a flared section 5211 and a constricted section 5212 along its extending direction. The transverse dimension of the flared section 5211 is larger than that of the constricted section 5212, and a stepped portion is formed at the transition between them. The fastener head 551 of the threaded fastener 550 can be received in the flared section 5211 and can abut against the stepped portion. The fastener shank 552 of the threaded fastener 550 can extend through the constricted section 5212 and extend out of the first through hole 521, and continue to extend in the direction of the barrel 100 so as to be connected to the key 560.

[0077] Referring to Figure 6 、 Figure 9 and Figure 10 , in order to prevent or avoid the threaded fastener 550 from accidentally coming out of the first through hole 521 of the mounting seat 500 and falling into the barrel 100, a retaining member 570 can be provided to hold the threaded fastener 550 in the first through hole 521. The retaining member 570 can be detachably connected to the mounting seat 500. The retaining member 570 can be a long strip and extend transversely above the fastener head 551 of the threaded fastener 550 to limit the threaded fastener 550 from completely coming out of the first through hole 521. The connecting portion 520 of the mounting seat 500 can have a through retaining member hole 523 (see Figures 3 to 5 ), and the retaining member 570 can be inserted into the retaining member hole 523 and extend transversely through the flared section 5211 of the first through hole 521, thereby restricting the fastener head 551 of the threaded fastener 550 in the flared section 5211 and finally holding the threaded fastener 550 in the first through hole 521 so as not to come out. The retaining member 570 can be elastic, such as a steel wire, or can be rigid. In other embodiments, the retaining member 570 can also be of other shapes or structures suitable for preventing the threaded fastener 550 from coming out. In other embodiments, the retaining member can also extend above the flared section 5211 outside the first through hole 521. During the assembly process, the threaded fastener 550 can be first inserted into the first through hole 521, and then the retaining member 570 can be installed in place.

[0078] The working principle of the connection structure between the mounting seat 500 and the barrel 100 is described below. First, referring to Figure 12, after the threaded fastener 550 is screwed into the second threaded through hole 561 in the key 560, the mounting seat 500 and the key 560 that are fixedly connected to each other can be regarded as an integral structure, that is, as shown in Figure 12 . It should be understood that Figure 12 is only shown for illustrative purposes. In fact, during assembly, the key 560 is connected to the mounting seat 500 after the mounting seat 500 is inserted into the barrel 100. Continuing to refer to Figure 12 , at this time, the part of the key 560 that extends out of the keyway 522 can be regarded as a protruding projection of the integral structure. Since this projection will be located in the through slot 110 of the barrel 100, the shape fit between the projection and the through slot 110 can limit the movement of the mounting seat 500 along the length direction of the barrel 100 and the rotation about the axial direction of the barrel 100, which is seen more clearly in Figures 9 to 11 .

[0079] Based on the above working principle, it can be known that the keyway 522 at the mounting base 500 is not necessary. Even without this keyway 522, as long as the key 560 is fixed to the mounting base 500 with the threaded fastener 550 and the key 560 can extend into the through slot 110 of the barrel 100, it can still play the role of restricting the movement and rotation of the mounting base 500 relative to the barrel 100 as described above. However, the inventor of the present application found that if there is no keyway 522 and if it is not desired that the key 560 and the threaded fastener 550 protrude from the outer surface of the barrel 100 in the assembled state, then the thickness of the key 560 cannot exceed the wall thickness of the barrel 100. In this way, when the wall of the barrel 100 is relatively thin, the threaded connection length or depth between the threaded fastener 550 and the key 560 will be very short, even shorter than the thickness of the key 560, which is very unfavorable for the threaded fastener 550 to stably hold the key 560. Moreover, if there is no keyway 522, the threaded fastener 550 needs to extend into the through slot 110 of the barrel 100. Therefore, even if the retaining member 570 can be elastic to allow the threaded fastener 550 to temporarily retract into the barrel 100, this threaded fastener 550 of such a length may still form an obstacle during the process of inserting the mounting base 500 into the barrel 100. In view of this discovery of the inventor, it is preferably to form a keyway 522 at the position of the connecting portion 520 of the mounting base 500 corresponding to the through slot 110 of the barrel 100. Due to the accommodation of the key 560 by this keyway 522, it allows the key 560 to have sufficient thickness, which also enables the second threaded through hole 561 therein to have sufficient depth or length. In this way, even if the threaded fastener 550 does not extend into the through slot 110 of the barrel 100, its extended portion in the keyway 522 is sufficient to form a sufficient threaded connection length with the key 560, so that the threaded fastener 550 can stably hold the key 560. The depth of the keyway 522 can be greater than the depth of the through slot 110, 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, in the case where the wall thickness of the barrel 100 is relatively large, or in the case where it is not necessary to restrict the key from protruding from the outer surface of the barrel, or in other applicable cases, the keyway 522 can also be omitted.

[0080] The assembly process of the laser gun of the present application is described below. First, before placing the mounting base 500 into the barrel 100, install the various components it needs to carry to the predetermined positions of the mounting base 500. These components may include the collimating mirror 330, the transmission rod 220 and its slider 540, the reflecting mirror frame 400, the threaded fastener 550 and its retaining member 570. The structure assembled in this way is as Figure 6 shown. In Figure 6As can be seen, the reflecting lens frame 400 can be temporarily rotated to a state substantially parallel to the reflecting lens frame mounting portion 530 and within the circumferential outer contour of the reflecting lens frame mounting portion 530, so that the reflecting lens frame 400 will not interfere when the mounting base 500 is inserted into the barrel 100. Next, Figure 6 The entire structure shown is inserted into the barrel 100, and the keyway 522 of the mounting base 500 is substantially aligned with the through slot 110 of the barrel 100. The state at this time is as shown in Figure 7 shown. Next, the key 560 is placed into the through slot 110 of the barrel 100 from the outside of the barrel 100, and at the same time, the respective second threaded through holes 561 of the key 560 are respectively aligned with the second end portions of the respective threaded fasteners 550 extending outward from the bottom wall of the keyway 522. Finally, the head end of a screwdriver or other suitable screwing tool is inserted through the second threaded through hole 561 of the key 560 to engage the engaging portion 5522 of the second end portion of the threaded fastener 550 to screw the threaded fastener 550. This causes the threaded fastener 550 to gradually screw into the second threaded through hole 561 of the key 560 and form a threaded connection therewith. Under the interaction of the external thread of the fastener rod portion 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 held in the first through hole 521, it is the key 560 that gradually moves downward or inward along the fastener rod portion 552 of the threaded fastener 550 into the keyway 522, forming the Figures 9 to 11 assembly state shown. In other words, in this case, it can be said that the threaded fastener 550 pulls the key 560 inward by means of the thread between it and the key 560. When initially screwing the threaded fastener 550, 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.

[0081] It should be noted that in this assembly state, as shown in Figure 9 and Figure 10 shown, the second end portion of the fastener rod portion 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, thus ensuring the smoothness of the outside of the laser gun. Similarly, the thickness of the key 560 can be set so that it is completely accommodated within the accommodation space 560' formed by the through slot 110 and the keyway 522 after assembly, and the outer surface of the key 560 is substantially flush with or slightly recessed from the outer surface of the barrel 100, and does not protrude from the outer surface of the barrel 100. In Figure 10In [description], the portion of the key 560 that enters the keyway 522 extends substantially through the entire depth of the keyway 522, so that there is a sufficient threaded connection length between the fastener rod portion 552 of the threaded fastener 550 and the second threaded through hole 561 of the key 560. At this time, the thickness of the key 560 can be substantially equal to or slightly less than the total depth of the keyway 522 and the through slot 110, so that the key 560 can extend through the entire keyway 522 and the through slot 110 in its thickness direction, and as Figure 11 shown, it will not protrude from the barrel 100 after installation. 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 satisfy its extension distance in the through slot 110, and it is not necessary to lower the key 560 to the bottom wall of the keyway 522.

[0082] In addition to the thickness of the key 560, the length of the threaded fastener 550 also needs to be concerned about. On the one hand, it is desired that there is a sufficient threaded connection length between it and the second threaded through hole 561 of the key 560. On the other hand, it is not desired that it forms an obstacle when inserting the mounting seat 500 into the barrel 100, or protrudes from the outer surface of the barrel 100 after assembly. In one embodiment, the length of the threaded fastener 550 can be set such that its second end is substantially flush with or recessed from the outer surface of the barrel 100 in the assembled state. For this case, the reduced diameter section 5212 of the first through hole 521 of the mounting seat 500 can be formed with threads. Before inserting the mounting seat 500 into the barrel 100, the threaded fastener 550 can be threadedly connected to the reduced diameter section 5212 and pre-held in the retracted state, so that the second end of the threaded fastener 550 does not interfere with the insertion process of the mounting seat 500. In the currently illustrated embodiment, the length of the threaded fastener 550 has been set such that its second end is substantially flush with the circumferential outer contour of the mounting seat 500 in the assembled state, so as not to affect the insertion process of the mounting seat 500 into the barrel 100. That is to say, the length of the threaded fastener 550 is such that after extending out from the first through hole 521, it can basically only extend through the extension of the entire keyway 522, and basically will not enter the through slot 110 of the barrel 100. This length of the threaded fastener 550 not only does not affect the insertion process of the mounting seat 500, but also will not protrude from the outer surface of the barrel 100.

[0083] The first through hole 521 of the mounting seat 500 can be a non-threaded hole, but as described in other embodiments above, this first through hole 521 can also be a threaded hole, and due to the self-holding effect of the threaded hole, the holding member 570 described above can also be omitted.

[0084] Figure 11As shown, the key 560 is elongated with arcs provided at both ends. However, in other embodiments, it can also be rectangular, circular, irregular, etc., as long as the through groove 110 and the key 560 have matching shapes.

[0085] The cooperation between the outer circumferential contour of the mounting base 500 and the inner circumferential contour of the barrel wall of the gun barrel 100 was mentioned above. This prevents the mounting base 500 from moving laterally relative to the gun barrel 100, which also helps prevent the key 560 from moving towards the inside of the gun barrel 100 and disengaging from the through groove 110 of the gun barrel 100. Of course, in other embodiments, other means can also be used to prevent the key 560 from disengaging from the through groove 110. For example, in other embodiments, when the wall thickness of the gun barrel 100 is sufficient, a step facing outward can be formed along the circumference of the through groove 110, and the key 560 abuts against this step to prevent the key 560 from entering the gun barrel 100. In other embodiments, a set screw is also used to press against the mounting base 500 on the barrel wall of the gun barrel 100 opposite to the through groove 110, so that the key 560 cannot disengage from the through groove 110.

[0086] It should also be noted that through the pre-positioning of the key 560, the through groove 110 of the gun barrel 100, and the key groove 522 of the mounting base 500, when the installed laser gun is working, the outgoing laser reflected by the mirror M carried by the reflection mirror frame 400 can be aligned with the light-emitting slit or notch 103 at the head end of the gun barrel 100.

[0087] As proposed in the Chinese patent application "A Laser Scanning Device" with the application number 2024111313696, in some harsh environments such as high temperature and high dust, an outer sleeve may also be provided outside the laser gun to isolate or at least avoid the influence of the furnace environment on the laser gun. The laser gun and the outer sleeve need to be frequently plugged and unplugged. If there is foreign matter between them, or the outer wall of the laser gun is not smooth, a jamming phenomenon will occur, making it impossible to pull out or insert the laser gun. In this application, after the key 560 is inserted into the through groove 110 of the gun barrel 100, the gun barrel 100 as a whole forms a cylindrical shape without protrusions, which is convenient for plugging and unplugging. Moreover, this application also uses a special design of the threaded fastener 550 to avoid the jamming situation that may be caused by its loosening. In this application, even if the threaded fastener 550 loosens, it is only possible to move towards the inside of the gun barrel 100, and will not move outward and affect the smoothness of the outside of the gun barrel 100.

[0088] The connection method between the mounting base 500 and the gun barrel 100 described above is not actually limited to the specific case of a laser gun, but can have a more general application scope. The idea of this connection method can be applied to any other situation where a second component needs to be held inside a cylindrical first component. Therefore, this application also proposes a connection structure here, which may include a cylindrical first component, a second component arranged inside the first component, and a key and a threaded fastener for holding the second component inside 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 the mounting base 500 can be correspondingly applied to the first component and the second component, and the structural features described above for the key 560 and the threaded fastener 550 can also be correspondingly applied to the key and the threaded fastener of this general connection structure. Further, other features and corresponding descriptions proposed above for the connection between the mounting base 500 and the gun barrel 100 can be applied to this general connection structure. Therefore, the description of this general connection structure will not be repeated here.

[0089] In the laser gun proposed in the Chinese patent application "A Laser Scanning Device" with the application number 2024111313696, the drive rod 220 and the laser transmission line 320 directly pass through the end wall of the tail end of the gun barrel 100, but there is no specific description on how to install the drive rod 220 and the laser transmission line 320. And from its technical solution, it opens from the head end of the gun barrel 100 to insert the drive rod 220 and the laser transmission line 320. The inventor of this application found that since the head end is located inside the furnace, if the seal of the head end opening is not tight, there will be a risk of gas leakage inside the furnace, and when replacing or repairing the internal components of the gun barrel 100, the entire laser gun needs to be pulled out for replacement, increasing the installation and maintenance difficulty.

[0090] To solve the above problems, different from the structure proposed in this document, this application changes to install the drive rod 220, the collimating mirror 330, and the laser transmission line 320 from the tail end of the gun barrel 100. During the installation process, since the position of the drive rod 220 is relatively fixed and it cannot be rotated during the installation process, and if the laser transmission line 320 rotates, it will also cause winding and damage, the inventor of this application proposed that the tail end sealing assembly 600 can seal the tail end of the gun barrel 100 without rotating the drive rod 220 and the laser transmission line 320. At the same time, the tail end sealing assembly 600 can also provide support and lubrication for the drive rod 220.

[0091] The tail-end sealing assembly 600 may include a positioning ring 610 detachably connected to the outer wall of the gun barrel 100. The positioning ring may be detachably connected to the outer wall of the gun barrel 100 by threads. By rotating the positioning ring 610, the relative position between the positioning ring 610 and the gun barrel 100 can be adjusted. Or as Figure 14 shown, an annular groove 101 is circumferentially provided on the outer wall of the gun barrel 100, and the positioning ring 610 can be snapped into the annular groove 101. There may be a plurality of annular grooves 101 to adjust the relative position between 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 moving during subsequent installation, holes may be provided in the positioning ring 610 in the diameter direction, and the set screw 611 is inserted into the holes to abut against the outer wall of the gun barrel 100, thereby maintaining the relative position between the positioning ring 610 and the gun barrel 100.

[0092] The tail-end sealing assembly 600 further includes a sealing cap 630. As Figure 13 shown, the sealing cap 630 is connected to the open end of the tail end of the gun barrel 100 and can position the circumferential position of the transmission rod 220. Figure 15 The structure of the sealing cap 630 is more clearly shown. 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. As Figure 15 shown, the sealing cap 630 includes a sealing cap body 631. The sealing cap body 631 is provided with a bottom wall and an annular side wall connected to the bottom wall. The diameter of the annular side wall of the sealing cap is slightly larger than the outer diameter of the gun barrel 100. The annular side wall is provided with positioning holes 634. The gun barrel 100 is provided with an elongated positioning groove 102 in the axial direction near its tail end. Figure 15 It is also shown that the sealing cap body 631 is provided with a transmission rod positioning hole 632 allowing the transmission rod 220 to penetrate and a laser transmission line installation hole 633 allowing the laser transmission line 320 to penetrate. The transmission rod positioning hole 632 can be hermetically connected to the transmission rod 220. The laser transmission line installation hole 633 can be hermetically 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, a screw or a set screw can be inserted into the positioning hole 634, and the tail end of the positioning member 640 extends into the elongated positioning groove 102. Thus, under the action of the positioning member 640 and the positioning hole 634, the sealing cap body 631 can only move in the axial direction of the gun barrel 100 and cannot rotate circumferentially, thereby restricting the circumferential positions of the transmission rod 220 and the laser transmission line 320 installed on the sealing cap 630. The outer wall of the annular side wall of the sealing cap body 631 is provided with a third thread 635.

[0093] The tail-end sealing assembly 600 further includes a locking nut 620. The locking nut 620 is provided with a bottom wall and an annular side wall connected to the bottom wall. The bottom wall of the locking nut 620 is provided with a through hole allowing the barrel 100 to penetrate, and also has a contact surface that can contact the positioning ring 610. The inner wall of the side wall of the locking nut 620 is provided with a fourth thread 621 matching 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.

[0094] When installing the tail-end sealing assembly 600, the drive rod 220 can be first inserted into the drive rod positioning hole 632, and the laser transmission line 320 can be passed through the laser transmission line installation hole 633. As Figure 15 shown, the positioning ring 610 can be connected to the barrel 100 and fixed to a predetermined axial position. As Figure 16 shown, then the sealing cap 630 is installed from the tail end to the head end direction of the barrel 100. The annular side wall of the sealing cap body 631 surrounds the side wall of the barrel 100, and the tail end of the barrel 100 faces the bottom wall of the sealing cap body 631. Align the positioning hole 634 and the elongated positioning groove 102, and insert the positioning member 640 to fix the circumferential position of the sealing cap body 631. As Figure 13 shown, the locking nut 620 is passed through from the head end of the barrel 100. Rotate the locking nut 620 so that the fourth thread 621 of the locking nut 620 is connected to the third thread 635 of the sealing cap body 631 until the bottom wall of the locking nut 620 abuts against the positioning ring 610 and locks with the sealing cap body 631. It can be seen from the above process that 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 positions of the laser transmission line 320 and the drive rod 220 installed on the sealing cap 630 are also restricted. At the same time, during the installation process, the sealing cap 630 does not rotate, that is to say, during the installation process, the drive rod 220 and the laser transmission line 320 do not rotate, but only perform axial linear motion, thus avoiding damage to the drive rod 220 due to torsion and preventing the laser transmission line 320 from being wound due to rotation.

[0095] As Figure 17 shown, the sealing cap body 631 can increase the sealing performance with the barrel 100 through the first sealing ring 650. The bottom wall of the sealing cap body 631 can be provided with a groove for installing the first sealing ring 650. After installation, the wall at the tail end of the barrel 100 abuts against the first sealing ring 650, and together with the sealing cap body 631 presses the first sealing ring 650, so that the sealing cap body 631 is hermetically connected to the barrel 100.

[0096] The sealing cap body 631 can be sealingly connected to the transmission rod 220 through the second sealing ring 660. A groove for installing the second sealing ring 660 is provided on the wall of the transmission rod positioning hole 632. To further enhance the sealing effect, multiple second sealing rings 660 can be provided. As described above, during the movement of the transmission rod 220 driving the reflection frame 400, it performs a reciprocating linear motion. Therefore, in this application, in order to provide a lubricating effect for the transmission rod 220, a lubricant chamber 6321 can be provided between the second sealing rings 660 in the transmission rod positioning hole 632. Since the second sealing rings 660 are provided on both sides of the lubricant chamber 6321, the lubricant 690 will not flow into the barrel 100 and will not leak. The liquid level of the lubricant 690 in the lubricant chamber 6321 can be higher than that of the transmission rod 220, thereby playing a sealing role. The gas that may exist in the barrel 100 is blocked by the second sealing ring 660 and the lubricant 690, and thus will not leak to the outside. To facilitate the addition of the lubricant 690, the sealing cap body 631 can also be provided with an injection hole 6322 communicating with the outside and the lubricant chamber 6321. The injection hole 6322 can be sealed by an injection hole cover 680. As Figures 18 - 19 shown, the injection hole cover 680 can include an injection hole upper cover 681, a spring 682, and an injection hole lower cover 683. The injection hole upper cover 681 can be threadedly connected 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 to move towards the lubricant 690 direction through elastic force, providing a certain pressure in the lubricant chamber 6321. This design is similar to a syringe, and the lubricant 690 is pushed by the injection hole lower cover 683 to wrap the transmission rod 220 at this position, thereby enhancing the lubricating effect. To enhance the sealing effect and prevent the leakage of the lubricant 690, 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 chamber 6321.

[0097] The sealing cap body 631 can be sealingly connected to the laser transmission line 320 through a sealing sleeve 670. The sealing sleeve 670 can be columnar, at least a part of which is in interference connection with the laser transmission line mounting hole 633, and it has a through hole 671 allowing the laser transmission line 320 to pass through. The laser transmission line 320 can be in interference connection with the through hole 671. To facilitate the installation of the injection hole upper cover 681, as Figure 20 shown, a slot 6811 can be provided at the top of the injection hole upper cover 681. To prevent the spring 682 from shifting between the injection hole upper cover 681 and the injection hole lower cover 683, the injection hole upper cover 681 or / and the injection hole lower cover 683 can also be provided with a receiving groove 6831 for receiving the end of the spring 682. Figure 21 The receiving groove 6831 of the injection hole lower cover 683 is shown.

[0098] The tail-end sealing assembly 600 and the mounting seat 500 described above together form a support and sealing structure for the components within the gun barrel 100.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A laser gun, comprising: A long barrel that extends along a length direction and has a head end and a tail end opposite to each other along its length direction; A through groove is formed in the barrel wall of the barrel, and the through groove penetrates the barrel wall; A mounting seat is arranged inside the barrel and is used for mounting and holding one or more components; a keyway recessed inward from its outer surface is formed in the mounting seat at a position corresponding to the through groove of the barrel, and a first through hole is formed in the keyway; A key that can be fixedly connected to the mounting seat, and the shape of the key matches the shape of the through groove of the barrel and is held in the through groove, and a part of the key also extends into the keyway of the mounting seat; the key has a second threaded through hole, and the second threaded through hole is substantially aligned with the first through hole; A threaded fastener for connecting the key to the mounting seat, the threaded fastener has opposite first and second ends, and a joint for engaging a screwing tool is formed at the second end; the threaded fastener is held in the first through hole of the mounting seat, and the second end extends out of the first through hole towards the barrel; Wherein, during assembly, with the threaded fastener held in the first through hole, the mounting seat is inserted into the barrel along the length direction of the barrel; outside the barrel, the second threaded through hole of the key is aligned with the second end of the threaded fastener, and the screwing tool is passed through the second threaded through hole of the key to engage the joint of the threaded fastener; the screwing tool uses the joint to screw the threaded fastener, so that the threaded fastener is gradually screwed into the second threaded through hole of the key and forms a threaded connection with the second threaded through hole, thereby fixedly connecting the key and the mounting seat to each other; due to the fixed connection between the key and the mounting seat, and the key is held by the through groove of the barrel, therefore, by means of the shape fit between the key and the through groove, the mounting seat cannot move along the length direction of the barrel and cannot rotate circumferentially relative to the barrel.

2. The laser gun according to claim 1, characterized in that, At least a part of the outer circumferential profile of the mounting seat matches the inner circumferential profile of the barrel wall of the barrel to substantially prevent the mounting seat from moving laterally in the barrel in a direction perpendicular to the length direction of the barrel.

3. The laser gun according to claim 1, characterized in that, In the assembled state, the part of the key substantially extends through the entire depth of the keyway.

4. The laser gun according to claim 1, wherein, In the assembled state, the outer surface of the key is substantially flush with or recessed from the outer surface of the barrel.

5. The laser gun according to claim 4, wherein The length of the threaded fastener is set such that in the assembled state, the second end of the threaded fastener is substantially flush with or recessed from the outer surface of the barrel.

6. The laser gun according to claim 5, characterized in that, The length of the threaded fastener is set such that in the assembled state, the second end of the threaded fastener is substantially flush with the outer circumferential profile of the mounting seat.

7. The laser gun according to claim 1, characterized in that, The threaded fastener has a fastener head and a threaded fastener shank, the fastener head having an enlarged size relative to the fastener shank, the fastener head forming the first end of the threaded fastener, and the end portion of the fastener shank being formed as the second end of the threaded fastener; The first through hole has a flared section and a constricted section along its extending direction, the lateral dimension of the flared section being larger than that of the constricted section; a stepped portion is formed between the transitions of the flared section and the constricted section, and the fastener head of the threaded fastener can be received within the flared section; the fastener shank of the threaded fastener extends through the constricted section of the first through hole.

8. The laser gun according to claim 1, characterized in that, It further includes a retaining member, which is connected to the mounting seat and extends laterally relative to the first through hole outside or inside the first through hole to retain the threaded fastener within the first through hole.

9. The laser gun according to claim 1, wherein, The key and the through slot are elongated and extend along the length direction of the barrel.

10. The laser gun according to any one of claims 1-9, characterized in that, It further includes: A laser transmission line for transmitting laser, which extends from outside the barrel into the barrel and extends along the barrel towards its head end; A collimating mirror, arranged within the barrel and optically connected to the head end of the laser transmission line; A reflecting mirror frame with a reflecting mirror, arranged within the barrel and adjacent to the collimating mirror; and A transmission rod, which extends from outside the barrel into the barrel and is operably connected to the reflecting mirror frame for driving the reflecting mirror frame to rotate; wherein, the mounting seat has a collimating mirror mounting portion for holding the collimating mirror and a reflecting mirror frame mounting portion for holding the reflecting mirror frame.

11. The laser gun according to claim 10, characterized in that, The mounting seat has a connecting portion located between the collimating mirror mounting portion and the reflecting mirror frame mounting portion, and the key slot is formed in the connecting portion.

12. The laser gun according to claim 10, characterized in that, The collimating mirror mounting portion includes a collimating mirror receiving hole for receiving the collimating mirror and at least one setscrew through hole for receiving a setscrew, the setscrew through hole penetrating from the outer surface of the collimating mirror mounting portion into the collimating mirror receiving hole so that the setscrew can penetrate into the collimating mirror receiving hole to press against the collimating mirror to fix the collimating mirror.

13. The laser gun according to claim 10, wherein, The collimating mirror mounting portion is formed with a first transmission rod through hole allowing the transmission rod to pass through, and the reflecting mirror frame mounting portion is formed with a second transmission rod through hole allowing the transmission rod to pass through; wherein, the first transmission rod through hole and the second transmission rod through hole are coaxially arranged along the same straight line parallel to the length direction of the barrel.

14. The laser gun according to claim 10, characterized in that, The reflecting mirror frame mounting portion includes an end wall portion and a first side wall and a second side wall extending from the end wall portion; the reflecting mirror frame is rotatably arranged between the first side wall and the second side wall.

15. The laser gun according to claim 14, characterized in that, It further includes a slider connected to the transmission rod, the slider is arranged between the first side wall and the second side wall, and the reflecting mirror frame is rotatably connected to the slider, and the transmission rod drives the reflecting mirror frame to rotate through the slider.

16. The laser gun according to claim 15, characterized in that, On the inner surfaces of the first side wall and the second side wall of the reflection frame mounting portion, slideways for supporting the slider are respectively formed, and the slider can linearly move along the length direction of the barrel on the slideways.

17. The laser gun according to claim 16, wherein The slider is substantially in a gate shape, and two side walls of the slider are respectively slidably supported on the first side wall and the second side wall of the reflection frame mounting portion; the reflection frame is rotatably connected to the slider between the two side walls of the slider.

18. A connection structure, comprising: A cylindrical first member, a through groove is formed in the cylindrical wall of the first member, and the through groove penetrates the cylindrical wall; A second member, arranged inside the first member and formed with a first through hole, and the first through hole is exposed in the through groove of the first member; A key, which can be fixedly connected to the second member, and the shape of the key matches the shape of the through groove of the first member and is held in the through groove. The key has a second threaded through hole, and the second threaded through hole is substantially aligned with the first through hole; A threaded fastener for connecting the key to the second member. The threaded fastener has opposite first and second ends, and a joint portion for engaging a screwing tool is formed at the second end; the threaded fastener is held in the first through hole of the second member, and the second end extends out of the first through hole towards the direction of the first member; Wherein, during assembly, with the threaded fastener held in the first through hole, the second member is inserted into the first member along the length direction of the first member; outside the first member, the second threaded through hole of the key is aligned with the second end of the threaded fastener, and the screwing tool is passed through the second threaded through hole of the key to engage the joint portion of the threaded fastener; the screwing tool uses the joint portion to screw the threaded fastener, so that the threaded fastener is gradually screwed into the second threaded through hole of the key and forms a threaded connection with the second threaded through hole, thereby fixedly connecting the key and the second member to each other; due to the fixed connection between the key and the second member, and the key is held by the through groove of the first member, therefore, by means of the shape fit between the key and the through groove, the second member cannot move along the length direction of the first member and cannot rotate circumferentially relative to the first member.

19. The connection structure according to claim 18, characterized in that, At least a part of the outer circumferential contour of the second member matches the inner circumferential contour of the cylindrical wall of the first member to substantially prevent the second member from moving laterally inside the first member.

20. The connection structure according to claim 19, wherein, The length of the threaded fastener is set to be substantially flush with or recessed relative to the outer circumferential contour of the second member in the held state.

21. The connection structure according to claim 18, characterized in that, It further includes a retaining member, the retaining member is connected to the second member and extends laterally relative to the first through hole outside or inside the first through hole to hold the threaded fastener in the first through hole.

22. The connection structure according to claim 21, wherein, The threaded fastener has a fastener head and a fastener shank with threads. The fastener head has an increased size relative to the fastener shank. The fastener head forms the first end of the threaded fastener, and the end portion of the fastener shank is formed as the second end of the threaded fastener. The first through-hole has a flared section and a constricted section along its extending direction. The transverse dimension of the flared section is larger than that of the constricted section. A step portion is formed between the transition of the flared section and the constricted section. The fastener head of the threaded fastener can be received within the flared section. The fastener shank of the threaded fastener extends through the constricted section of the first through-hole.

23. The connection structure according to claim 18, wherein, The second member has a keyway formed by indenting inward from its outer surface. The first through-hole communicates with the bottom of the keyway. Wherein, in the assembled state, a part of the key extends into the keyway.

24. The connection structure according to claim 23, characterized in that, In the assembled state, the part of the key extends substantially across the entire depth of the keyway.

25. The connection structure according to any one of claims 18 - 24, characterized in that, In the assembled state, the outer surface of the key is substantially flush with or recessed relative to the outer surface of the first member.

26. The connection structure according to claim 25, wherein, The length of the threaded fastener is set such that in the assembled state, the second end of the threaded fastener is substantially flush with or recessed relative to the outer surface of the first member.

27. The connection structure according to any one of claims 18-24, characterized in that, The key and the through-slot are elongated and extend along the length direction of the cylindrical first member.

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