Fixed dimming device for laser

Abstract

The utility model relates to the technical field of lasers, in particular to a laser fixing and dimming device which comprises a lens cone base connected to the transmitting end of a laser body and provided with a through hole, a light beam can penetrate through the through hole, and the inner wall of the through hole is provided with a first hole, a second hole and a third hole. The first hole, the second hole and the third hole are combined to form a step shape, the sectional area is gradually increased, and the first hole is located at one end close to the laser body; the adjustable lens barrel is coaxially nested in the second hole, and the outer wall of the adjustable lens barrel is in clearance fit with the second hole; the limiting sheets radially slide on the lens cone base, and the limiting sheets abut against one end, far away from the laser body, of the adjustable lens cone; and the adjusting piece is arranged on the lens cone base, is connected with the limiting piece, and is used for driving the limiting piece to be close to or far away from the middle part of the lens cone base. The utility model has the effects of reducing the repeated dimming of the laser and reducing the influence on the normal use of the laser.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lasers, in particular to a laser fixing and light adjusting device. BACKGROUND

[0002] At present, as a core component of a precision optical system, a laser directly affects the performance of downstream optical equipment in terms of collimation of an output light beam. The laser is widely applied to the fields of laser marking, laser scanning and laser ranging.

[0003] In the prior art, in an industrial laser processing device, the positioning stability of an optical lens directly affects the light beam transmission quality. A mainstream lens fixing device currently adopts the following structure: a threaded pressing ring type fixing, which realizes fixing by abutting against the outer edge of the lens through a threaded pressing ring. The structure is prone to generate a threaded pair gap under continuous vibration working conditions, resulting in an axial displacement exceeding the tolerance of ±0.15mm, and frequent shutdown and readjustment are required, thereby affecting the normal use of the laser. SUMMARY

[0004] In order to reduce repeated light adjustment of the laser and reduce the influence on the normal use of the laser, the application provides a laser fixing and light adjusting device.

[0005] The laser fixing and light adjusting device provided by the application adopts the following technical scheme:

[0006] The laser fixing and light adjusting device comprises:

[0007] A lens barrel base connected to the emission end of a laser body, a through hole penetrating through the lens barrel base, a light beam being capable of passing through the through hole, a first hole, a second hole and a third hole being formed on the inner wall of the through hole, the first hole, the second hole and the third hole being combined to form a stepped shape, and the cross-sectional area gradually increasing, and the first hole being located at one end close to the laser body;

[0008] An adjustable lens barrel coaxially nested in the second hole, and the outer wall of the adjustable lens barrel being gap-fitted with the second hole;

[0009] Limiting sheets radially sliding on the lens barrel base, and at least three limiting sheets being provided, and the limiting sheets being abutted against one end of the adjustable lens barrel away from the laser body;

[0010] An adjusting piece provided on the lens barrel base and connected with the limiting sheets, and used for driving the limiting sheets to be close to or away from the middle part of the lens barrel base.

[0011] By adopting the technical scheme, the stepped three-hole structure (the first hole to the third hole) forms a light beam expansion channel, the adjustable lens barrel is first installed in the second hole, then the position of the limiting sheet is adjusted by using the adjusting piece, so that the limiting sheet abuts against the adjustable lens barrel, then the laser body is connected with the lens barrel base, the lens barrel base fixes the laser beam path through the through hole, the laser body is opened to emit a laser beam, and the adjustable lens barrel adjusts the laser beam; the gradual change of the sectional area of the stepped hole facilitates the positioning and limiting of the axial direction of the adjustable lens barrel; the limiting sheet can limit the position of the adjustable lens barrel, reduce the axial sliding of the adjustable lens barrel caused by factors such as vibration, so that the original accuracy can be maintained, the repeated adjustment of the laser is reduced, the efficiency is improved, and the gap fit (H7 / g6 tolerance) ensures smooth movement of the adjustable lens barrel and avoids light axis deviation.

[0012] Optionally, the adjustable lens barrel is provided with an outwardly extending wedge-shaped flange;

[0013] The locking ring is threadedly connected to the lens barrel base and located at one end close to the third hole, abuts against the wedge-shaped flange, and cooperates with the wedge-shaped flange to form a tapered locking surface; when screwed, a radial contraction clamping force is generated on the wedge-shaped flange.

[0014] By adopting the technical scheme, the adjustable lens barrel with the wedge-shaped flange is added, the locking ring generates a radial clamping force through the tapered locking surface, the locking ring is tightened after adjustment, and the tapered locking surface forces the wedge-shaped flange to contract radially; the threaded tightening is converted into a radial clamping force (the clamping force is increased by about 30%), the adjustable lens barrel is axially and radially fixed, mechanical vibration is reduced, the influence on the mechanical structure is reduced, and then the laser beam is kept stable and accurate, the probability of frequent correction and adjustment is reduced, the adjustment is facilitated, and the work efficiency is improved.

[0015] Optionally, it further comprises:

[0016] The buffer layer is arranged at one end of the adjustable lens barrel and located at one end close to the first hole and abuts against the side wall of the second hole close to the first hole.

[0017] By adopting the technical scheme, the buffer layer is arranged at the first hole end of the adjustable lens barrel, the buffer layer contacts the side wall of the second hole to form a damping interface; the impact during starting and stopping of the laser is absorbed (the axial impact displacement is reduced by 60%), mechanical vibration can be reduced, the influence on the adjustable lens barrel and the laser body is reduced, and the adjustment frequency is reduced.

[0018] Optionally, a strain sensor is arranged on the wedge-shaped flange, a plurality of groups of piezoelectric ceramic driving pieces are embedded on the tapered locking surface of the locking ring, each group of driving pieces is connected to a control module outside the lens barrel base through a wire, the control module receives a signal of the strain sensor arranged on the wedge-shaped flange, and the extension and contraction amount of the driving piece is adjusted in real time.

[0019] By adopting the technical scheme, the wedge-shaped flange is provided with the strain sensor, the locking ring cone surface is embedded into the piezoelectric ceramic driving piece for closed-loop control, the strain sensor monitors the clamping force attenuation, and the piezoelectric ceramic piece compensates the locking force in real time; through the above setting, the axial stability of the adjustable lens barrel is ensured, the slippage is reduced, and the equipment stability is improved.

[0020] Optionally, the limiting sheet is provided with a driving surface, the driving surface is inclined and abuts against the adjustable lens barrel, and an end of the driving surface away from the adjustable lens barrel is inclined away from the laser body.

[0021] By adopting the technical scheme, the inclined surface of the limiting sheet driving surface converts the axial displacement into radial thrust when the adjusting part moves; the adjusting operation direction is parallel to the optical beam axis, the adjustable lens barrel is axially limited, the position of the limiting sheet can be adjusted according to the site vibration, and the equipment stability is improved.

[0022] Optionally, a plurality of positioning pins are arranged on the inner wall of the second hole, a corresponding positioning groove is arranged on the side wall of the end of the adjustable lens barrel close to the laser body, and the positioning pins can slide in the positioning groove to radially position the adjustable lens barrel.

[0023] By adopting the technical scheme, the positioning pins are arranged to reduce the circumferential rotation of the adjustable lens barrel and improve the axial positioning effect and the stability of the adjustable lens barrel.

[0024] Optionally, a blocking ring is slidably arranged on the outer wall of the lens barrel base, and the blocking ring can block the adjusting part.

[0025] By adopting the technical scheme, the blocking ring covers the adjusting part by sliding in the guide groove, the elastic column is pressed against the adjusting part when the blocking ring rotates, the blocking ring is rotated to the locking position after adjustment, the elastic column generates additional pressing force, physical blocking reduces the probability of accidental touching, and the elastic pressure enhances the stability of the adjusting part (the anti-vibration ability is improved by 15%).

[0026] Optionally, an arc-shaped guide groove is arranged on the lens barrel base, a guide block is arranged on the blocking ring, the guide block slides in the arc-shaped guide groove, an elastic column is arranged on the blocking ring, and the elastic column is pressed against the adjusting part when the blocking ring rotates.

[0027] By adopting the technical scheme, the arc-shaped guide groove facilitates the rotation of the blocking ring during sliding, the elastic column is pressed against the adjusting part, and the elastic column is away from the adjusting part when the blocking ring rotates in the opposite direction, so that the position of the limiting sheet is adjusted.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. The stepped three-hole structure (from the first hole to the third hole) forms a beam expansion channel. First, the adjustable lens tube is installed in the second hole. Then, the position of the limiting plate is adjusted using the adjusting component so that the limiting plate abuts against the adjustable lens tube. Then, the laser body is connected to the lens tube base. The lens tube base fixes the laser beam path through the through hole. The laser body is turned on to emit the laser beam, and the adjustable lens tube adjusts the laser beam. The gradually changing cross-sectional area of ​​the stepped holes facilitates the axial positioning and restriction of the adjustable lens tube. The limiting plate can limit the position of the adjustable lens tube, reduce the axial sliding of the adjustable lens tube caused by factors such as vibration, maintain the original accuracy, reduce repeated adjustments of the laser, improve efficiency, and the clearance fit ensures smooth movement of the adjustable lens tube while avoiding optical axis deviation.

[0030] 2. The limiting plate driving surface adopts an inclined surface design. When the adjusting component moves, the inclined surface converts the axial displacement into radial thrust. The adjustment operation direction is parallel to the beam axis, which facilitates axial limiting of the adjustable lens barrel. At the same time, the position of the limiting plate can be adjusted according to the vibration of the site, thereby improving the stability of the equipment.

[0031] 3. The arc-shaped guide groove facilitates the rotation of the retaining ring during sliding, allowing the elastic column to press and hold the adjusting component. When rotating in the opposite direction, the elastic column moves away from the adjusting component, making it easier to adjust the position of the limiting piece. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the dimming device in the embodiments of this application;

[0033] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0034] Figure 3 yes Figure 1 A magnified view of a portion of region B in the middle;

[0035] Figure 4 This is a diagram illustrating the arc-shaped guide groove in an embodiment of this application.

[0036] Reference numerals: 100, lens barrel base; 110, first hole; 120, second hole; 130, third hole; 200, adjustable lens barrel; 210, wedge-shaped flange; 220, annular groove; 230, positioning groove; 240, arc-shaped guide groove; 300, limiting piece; 310, driving surface; 400, adjusting component; 500, locking ring; 600, buffer layer; 700, positioning pin; 800, retaining ring; 810, guide block; 820, elastic post. Detailed Implementation

[0037] The following combination Figures 1 to 4 This application will be described in further detail.

[0038] The embodiment discloses a laser fixed light adjusting device.

[0039] Referring to Figure 1 The laser fixed light adjusting device comprises a lens barrel base 100 connected with a laser body, an adjustable lens barrel 200 arranged in the lens barrel base 100, a limiting sheet 300 slidingly arranged on the lens barrel base 100, and an adjusting part 400 arranged on the lens barrel base 100 and used for adjusting the position of the limiting sheet 300. The limiting sheet 300 is in abutment with one end of the adjustable lens barrel 200 and is used for reducing the axial displacement of the adjustable lens barrel 200. In use, first, the adjustable lens barrel 200 is arranged in the lens barrel base 100, then the limiting sheet 300 is driven to slide by the adjusting part 400, so that the limiting sheet 300 limits the axial direction of the adjustable lens barrel 200, then the lens barrel base 100 is connected with the laser body, and then the emission of a laser beam is performed.

[0040] The lens barrel base 100 is made of hard aluminum alloy and is connected to the emission end of the laser body through a flange bolt. First holes 110 (Φ5 mm), second holes 120 (Φ8 mm) and third holes 130 (Φ12 mm) are sequentially arranged on the inner wall of the through hole of the lens barrel base 100, the three holes coaxially form a stepped beam channel, and the cross-sectional area gradually increases from the first holes 110 to the third holes 130. The first holes 110 are close to the laser body and are used for preliminarily restricting the beam divergence angle; the second holes 120 and the third holes 130 form a stepped surface at the joint, which is used for the axial limiting of the adjustable lens barrel 200.

[0041] The adjustable lens barrel 200 is made of brass H62, the outer diameter is in clearance fit with the second holes 120, and the adjustable lens barrel 200 is coaxially nested in the second holes 120. An annular groove 220 is arranged on the end face of the end of the adjustable lens barrel 200 away from the laser body, and is used for cooperation with the limiting sheet 300.

[0042] Referring to Figure 1 And Figure 2 The limiting sheet 300 can be arranged in multiple, preferably three, and guide grooves are arranged on the inner wall of the third holes 130 of the lens barrel base 100. The three guide grooves are equally spaced along the circumferential direction of the third holes 130, and the three limiting sheets 300 (120° distribution) are radially slidingly arranged in the guide grooves of the lens barrel base 100. The inner side end face of the limiting sheet 300 is in abutment with the annular groove 220 of the adjustable lens barrel 200, and the abutment surface of the limiting sheet 300 and the annular groove 220 forms a driving surface 310. The driving surface 310 is obliquely arranged, and the end of the driving surface 310 away from the center of the adjustable lens barrel 200 is inclined towards the laser body. With the driving of the adjusting part 400, the limiting sheet 300 is close to the middle, the extrusion on the annular groove 220 of the adjustable lens barrel 200 is increased, and the adjustable lens barrel 200 has a tendency to be close to the laser body.

[0043] Referring toFigure 1 , Figure 2 and Figure 3 , the adjusting member 400 adopts an M3 fine adjustment screw, which is threadedly connected to the side wall of the lens barrel base 100, and moves the limiting piece 300 radially by rotating to realize the axial fine adjustment of the adjustable lens barrel 200 (adjustment accuracy ±0.01mm), and the adjusting member 400 is rotationally connected to the end of the limiting piece 300 away from the adjustable lens barrel 200.

[0044] The adjustable lens barrel 200 is installed into the second hole 120 of the lens barrel base 100, and the limiting piece 300 is pushed by the adjusting member 400 to abut against the end face of the adjustable lens barrel 200; after the laser is started, the light spot shape is observed, and the position of the adjustable lens barrel 200 is adjusted by the adjusting member 400 until the beam is collimated; the stepped hole structure reduces the scattering of the light beam, and the radial clamping force of the limiting piece 300 can resist vibration impact below 5g to maintain the light adjustment accuracy.

[0045] Preferably, in order to facilitate the radial restraint of the adjustable lens barrel 200, a wedge-shaped flange 210 with a 30° taper angle is arranged at the end of the adjustable lens barrel 200 away from the laser body. A locking ring 500 is threadedly connected to the end of the third hole 130 away from the laser body, the material of the locking ring 500 is stainless steel 304, and it is threadedly connected to the end of the third hole 130 of the lens barrel base 100 through an M24×1 fine thread, and the inner taper surface thereof forms a tapered locking surface with the wedge-shaped flange 210. When the locking ring 500 is tightened, the tapered surfaces cooperate to generate a radial clamping force (about 80N / cm²) to make the outer wall of the adjustable lens barrel 200 closely fit the second hole 120, and eliminate the axial gap.

[0046] In order to reduce the influence of vibration on the adjustable lens barrel 200, a buffer layer 600 is fixedly connected to the end of the adjustable lens barrel 200 close to the laser body, the buffer layer 600 is a layered structure (thickness 2mm, Shore hardness 50A) formed after the silicon rubber is coated, and forms a damping interface in contact with the inner wall of the second hole 120. Tests show that this structure can absorb 60% of the impact displacement when the laser is started and stopped, and reduce the resonance frequency from 500Hz to 180Hz.

[0047] In order to facilitate real-time monitoring of the force applied to the wedge-shaped flange 210, a strain gauge (model: KFG-5-120-C1-11L3M2R) is attached to the surface of the wedge-shaped flange 210, and three groups of piezoelectric ceramic driving pieces (model: PIP-888.91) are embedded in the tapered surface of the locking ring 500, and each group of driving pieces is connected to a PID control module outside the lens barrel base 100 through flexible wires; when the strain sensor detects that the clamping force attenuation exceeds the set threshold value (such as ±5N), the control module applies a voltage of 0-100V to the piezoelectric ceramic piece, and the driving piece generates a stretching amount of ±2μm to compensate the locking force in real time, so that the clamping force fluctuation is controlled within ±2N. This design can reduce the displacement error caused by temperature drift from 1.2μm / ℃ to 0.3μm / ℃.

[0048] With reference to Figure 1 and Figure 4 In order to reduce the false touch of the adjusting part 400, an arc-shaped guide groove 240 is processed on the outer side of the lens barrel base 100, the guide block 810 on the inner side of the blocking ring 800 (material: POM) is slidingly fitted in the guide groove, and the elastic column 820 corresponding to the adjusting part 400 is fixedly connected to the inner wall of the blocking ring 800, the elastic column 820 is arranged in a staggered manner with the adjusting part 400 and can be close to the adjusting part 400 by rotating. When the blocking ring 800 rotates, the silicon manganese spring steel elastic column 820 (pre-tightening force 8N) in the interior thereof gradually presses the nut of the adjusting part 400.

[0049] After the adjustment is completed, the blocking ring 800 is rotated to one end, the adjusting part 400 is shielded, at this time, the elastic column 820 presses the adjusting part 400, so that the vibration resistance of the adjusting part 400 is improved by 15%. The blocking ring 800 covers the exposed part of the adjusting part 400 at the same time, so as to reduce the probability of accidental touch.

[0050] In order to further facilitate the positioning of the adjustable lens barrel 200, four positioning grooves 230 are arranged on the circumferential wall of one end of the adjustable lens barrel 200 to which the buffer layer 600 is installed, the positioning pin 700 is fixedly connected to the inner wall of the second hole 120, the positioning pin 700 is inserted into and slides along the positioning groove 230, and the circumferential contact gap between the positioning groove 230 and the positioning pin 700 is 0.2mm.

[0051] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A laser fixed-attenuator device, characterized by: The utility model relates to a laser head with adjustable focusing distance, which comprises a mirror barrel base (100) connected to the emitting end of a laser body, a through hole penetrating through the mirror barrel base (100), a light beam capable of passing through the through hole, a first hole (110), a second hole (120) and a third hole (130) sequentially arranged on the inner wall of the through hole, the first hole (110), the second hole (120) and the third hole (130) combined to form a stepped shape with gradually increasing cross-sectional areas, and the first hole (110) located at one end close to the laser body. An adjustable mirror barrel (200) coaxially nested in the second hole (120) and gap-fitted with the outer wall of the second hole (120); Limiting sheets (300) radially sliding on the mirror barrel base (100) and at least three of which abutting against one end of the adjustable mirror barrel (200) away from the laser body; An adjusting part (400) arranged on the mirror barrel base (100) and connected with the limiting sheets (300) for driving the limiting sheets (300) to move towards or away from the middle part of the mirror barrel base (100). The adjustable mirror barrel (200) is provided with a wedge-shaped flange (210) extending outward; 2. The laser fixed-attenuator device of claim 1, wherein A locking ring (500) threadedly connected to the mirror barrel base (100) and located at one end close to the third hole (130), abutting against the wedge-shaped flange (210) and cooperating with the wedge-shaped flange (210) to form a tapered locking surface, and generating a radial contraction clamping force on the wedge-shaped flange (210) when being screwed. Further comprising:

3. The laser fixed-attenuator device of claim 2, wherein A buffer layer (600) arranged at one end of the adjustable mirror barrel (200) and located at one end close to the first hole (110), abutting against the side wall of the second hole (120) close to the first hole (110). The wedge-shaped flange (210) is provided with a strain sensor, and the tapered locking surface of the locking ring (500) is embedded with multiple groups of piezoelectric ceramic driving sheets, each group of driving sheets being connected to a control module outside the mirror barrel base (100) through wires, the control module receiving a signal of the strain sensor arranged on the wedge-shaped flange (210) and adjusting the extension and contraction amount of the driving sheets in real time.

4. The laser fixed-attenuator device of claim 2, wherein: The limiting sheet (300) is provided with a driving surface (310) obliquely arranged and abutting against the adjustable mirror barrel (200), and one end of the driving surface (310) away from the adjustable mirror barrel (200) is inclined towards the direction away from the laser body.

5. The laser fixed-attenuator device of claim 4, wherein: The inner wall of the second hole (120) is provided with multiple positioning pins (700), and the side wall of the adjustable mirror barrel (200) close to the laser body is provided with a corresponding positioning groove (230), and the positioning pins (700) can slide in the positioning groove (230) for radially positioning the adjustable mirror barrel (200).

6. The laser fixed-attenuator device of claim 4, wherein: A stop ring (800) is slidingly arranged on the outer wall of the mirror barrel base (100), and the stop ring (800) can shield the adjusting part (400).

7. The laser fixed-attenuator device of claim 6, wherein: ​ 8. The laser fixed-attenuator device of claim 7, wherein: The mirror barrel base (100) is provided with an arc-shaped guide groove (240), the stop ring (800) is provided with a guide block (810), the guide block (810) slides in the arc-shaped guide groove (240), the stop ring (800) is provided with an elastic column (820), and the elastic column (820) abuts against the adjusting piece (400) with the rotation of the stop ring (800).

Images