Centering device for focusing lens group of laser cutting head

Abstract

The invention relates to a laser cutting head focus lens set centering device which effectively solves the problems that traditional manual centering operation is tedious, and precision depends on personnel experience. The device is mainly composed of a lens assembly, an adjusting mechanism and a driving assembly. The lens assembly is fixed on the adjusting mechanism moving seat through a specific screw. In the adjusting mechanism, a transmission shaft is in threaded connection with a centering panel through a threaded nesting sleeve, a front-end semi-sphere is matched with a polymer nesting sleeve, and flexible rotation and jamming prevention are ensured under the fixing of a polymer gland; the guide block and the positioning pin cooperate to limit deflection of the moving seat. The electric drive assembly is connected with a transmission shaft through a motor connecting base and an inner hexagonal pipe sleeve to achieve automatic centering. And the manual adjusting knob is fixed on the transmission shaft through a stop screw to realize manual operation. The structure design is ingenious, the adjusting modes can be flexibly switched according to requirements, the lens centering efficiency and precision are remarkably improved, and the laser cutting quality is powerfully guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of centering of a focusing lens group of a laser cutting head, and in particular to a centering device of a focusing lens group of a laser cutting head. Background Art

[0002] The laser head focuses the laser light path by combining different lenses and changing the relative position relationship between the lens groups, thereby realizing laser processing technologies with different requirements. Due to processing errors in mechanical parts and lenses themselves, the lenses cannot be completely coaxial, so an adjustment device is required to adjust the lens position to achieve a coaxial position relationship between the lenses.

[0003] Traditional laser heads are mostly centered manually, which is cumbersome to operate. Each manual adjustment requires the light to be turned on to check the adjustment amount, and the centering quality is directly affected by the operator's experience level. Therefore, a more flexible and automated lens centering device is needed to optimize the above problems. Summary of the invention

[0004] The object of the present invention is to provide a centering device for a focusing lens assembly of a laser cutting head to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a centering device for a focusing lens group of a laser cutting head, comprising an adjustment mechanism, a lens assembly installed on the adjustment mechanism, and a driving assembly for driving the adjustment mechanism for adjustment, the adjustment mechanism comprising a centering panel for installing the driving assembly, a transmission shaft screwed to the centering panel, and a movable seat connected to the top of the transmission shaft, the front end of the transmission shaft is inserted into a polymer nesting at the bottom of the movable seat, and a polymer pressure cover is fixed under the polymer nesting, a guide block is installed at the middle part of the lower end of the movable seat through a locating pin, a threaded nesting is installed on the centering panel at a position screwed to the transmission shaft, and the rear end of the transmission shaft is connected to the driving assembly.

[0006] Furthermore, the lens assembly includes a middle annular lens barrel, a lens installed inside the lens barrel, a lens ring support supported by the bottom of the lens, and a pressure cover for pressing the lens at the upper end. The lens assembly is installed and fixed inside the circular hole of the movable seat.

[0007] Furthermore, the transmission shaft includes an external hexagon connected to the electric drive assembly, an external thread of the middle portion screwed to the center adjustment panel, and a semi-circular ball at the front end inserted into the polymer nesting.

[0008] Furthermore, a U-shaped groove is provided in the middle of the guide block, and the positioning pin is inserted in the U-shaped groove.

[0009] Furthermore, the driving component adopts one of an electric driving component and a manual adjustment knob.

[0010] Furthermore, the electric drive assembly includes a motor connection seat fixed on the centering panel, a hollow motor installed on the motor connection seat, and a hexagonal sleeve connected to the output shaft at the front end of the hollow motor, and the hexagonal sleeve is plugged together with the transmission shaft.

[0011] Furthermore, the polymer nest and polymer gland are made of high-performance polymer material with good self-lubrication, which reduces the friction and wear between the semicircular ball at the front end of the transmission shaft and the polymer nest, and the four screws thereof press the polymer nest.

[0012] Furthermore, the threaded nest is made of high-strength wear-resistant alloy material to ensure that the transmission shaft can stably translate back and forth when rotating, thereby accurately driving the moving seat to move and achieving precise centering of the lens assembly.

[0013] Furthermore, the lens assembly is installed in the step hole of the adjustment mechanism by means of high-precision customized screws. The screws are made of a special alloy material that is rust-proof and has a certain elasticity. The limiting effect of the step hole and the tightening force of the screws are utilized to firmly fix the lens assembly inside the circular hole of the moving seat.

[0014] Furthermore, the surface of the manual adjustment knob has an anti-slip texture, and the adjustment knob is fixed in relative position to the transmission shaft by a high-strength stop screw. The stop screw adopts an anti-loosening design, and during the process of manually rotating the adjustment knob, it can ensure the tightness of the connection with the transmission shaft to avoid looseness or displacement. By manually rotating the adjustment knob, the rotation of the transmission shaft can be accurately controlled, thereby achieving precise displacement of the moving seat and the lens assembly.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The device can switch freely between electric drive automatic adjustment and manual adjustment as needed. When installing the motor, the electric drive component and the visual recognition system can achieve closed-loop automatic adjustment of the lens, greatly reducing the manual operation links and improving the adjustment efficiency and accuracy; in cost considerations or specific scenarios, the motor can be removed and the manual adjustment knob can be installed to easily switch to manual operation mode, adapting to multiple application environments.

[0016] The lens assembly is fixed to the step hole of the adjustment mechanism by high-precision custom screws. The special alloy screws have both rust-proof and elastic properties. Together with the step hole limiter, it ensures that the lens is stable and displacement-free in the circular hole of the moving seat, laying the foundation for precise centering. The semicircular ball at the front end of the transmission shaft is nested with a self-lubricating polymer, and four screws press the polymer gland, which not only ensures the flexible rotation and moderate angle change of the transmission shaft, prevents the mechanism from getting stuck, but also reduces friction loss and prolongs the service life; the threaded nesting of the centering panel is made of high-strength wear-resistant alloy to ensure stable and reliable threaded transmission, and accurately convert the rotation of the transmission shaft into the linear displacement of the moving seat, thereby achieving precise centering of the lens.

[0017] During automatic centering, the hollow motor is firmly connected to the centering panel through the connection seat, the hexagonal sleeve is tightly fixed to the motor output shaft and reliably plugged into the drive shaft, the motor drives the drive shaft to move accurately, and quickly responds to system instructions to achieve automatic calibration of the lens position, greatly shortening the centering time and improving processing efficiency; the non-slip texture design and anti-loosening stop screw on the surface of the manual adjustment knob ensure the stability of the operation feel and the connection between the knob drive shaft. The operator can finely control the rotation of the drive shaft by hand to achieve fine adjustment of the lens, meet the needs of high-precision centering, reduce dependence on operator experience, and improve the consistency of centering quality. . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the explosion of the electric drive device of the present invention; Figure 2 It is a schematic diagram of the cross section of the electric drive device of the present invention; Figure 3 It is a three-dimensional schematic diagram of the assembly of the electric drive device of the present invention; Figure 4 It is a three-dimensional schematic diagram of the adjustment mechanism of the present invention; Figure 5 It is a cross-sectional schematic diagram of the adjustment mechanism of the present invention; Figure 6 is a schematic diagram of a lens assembly of the present invention; Figure 7 It is a schematic diagram of the transmission shaft of the present invention; Figure 8 It is a schematic diagram of the guide block of the present invention; Fig. 9 It is a three-dimensional schematic diagram of the front and back sides of the centering panel of the present invention; Fig.10 It is an exploded schematic diagram of the manual centering device of the present invention; Fig.11 It is a cross-sectional schematic diagram of the manual centering device of the present invention; Fig.12 It is a three-dimensional schematic diagram of the manual centering device of the present invention.

[0019] In the figure: 1. lens assembly; 11. pressure cover; 12. lens barrel; 13. lens; 14. lens ring support; 2. adjustment mechanism; 21. moving seat; 22. polymer nesting; 23. polymer pressure cover; 24. transmission shaft; 241. semi-circular ball; 242. external thread; 243. external hexagon; 25. positioning pin; 26. guide block; 27. threaded nesting; 28. centering panel; 3. electric drive assembly; 31. motor connecting seat; 32. internal hexagonal pipe sleeve; 33. hollow motor; 4. manual adjustment knob. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 —12. The present invention provides a technical solution: an implementation method of a centering device for a focusing lens group of a laser cutting head is as follows: Place the various components of the adjustment mechanism 2 on the workbench in order, and carefully check their appearance to ensure that there are no defects such as bumps, deformations, burrs, etc. Clean the components such as the adjustment panel 28, the moving seat 21, the polymer nesting 22, the polymer gland 23, the positioning pin 25, the guide block 26 and the threaded nesting 27 to remove surface oil, dust and impurities. Use an ultrasonic cleaner with a special cleaning agent to clean them. After cleaning, wipe them with anhydrous ethanol and dry them, which lays a good foundation for subsequent assembly.

[0022] Fine assembly and debugging of lens assembly 1 In a clean operating room, open the dust cover, place the lens barrel 12 on a special fixing fixture, use a dust-free wipe cloth dipped in an appropriate amount of anhydrous ethanol, and gently wipe the inner surface of the lens barrel 12 to ensure that there are no particles left. When taking the lens 13, the operator needs to wear clean gloves and finger cots to prevent fingerprints and sweat from contaminating the lens. Slowly put the lens 13 into the lens barrel 12 so that its center coincides with the axis of the lens barrel 12. Use an optical microscope to observe the uniformity of the gap between the edge of the lens 13 and the inner wall of the lens barrel 12. The deviation is controlled within 0.02mm.

[0023] Place the lens ring support 14 at the bottom of the lens 13 and adjust its position to evenly support the lens 13 to prevent uneven force on the lens 13. Then, align the gland 11 with the upper opening of the lens barrel 12 and slowly screw it in. Use a torque screwdriver to tighten the screws on the gland 11 according to the specified torque. While tightening, use a dial indicator to monitor the flatness change of the lens 13 to ensure that the lens 13 is firmly fixed in the lens barrel 12 and has no stress deformation.

[0024] Carefully transfer the assembled lens assembly 1 to the top of the moving seat 21 of the adjustment mechanism 2, so that the bottom of the lens assembly 1 is aligned with the edge of the circular hole of the moving seat 21. Use high-precision custom screws to fix the lens assembly 1 in the stepped hole of the moving seat 21. The screw tightening process follows the principle of diagonal step-by-step tightening, and is tightened in multiple times with small torque. After each tightening, use a micrometer to measure the concentricity of the lens assembly 1 relative to the moving seat 21 to ensure the installation accuracy of the lens assembly 1 and the moving seat 21.

[0025] After installation, an optical interferometer is used to detect the parallelism between the optical axis of the lens assembly 1 and the moving direction of the movable seat 21. The parallelism error is controlled within ±0.01° by fine-tuning the position of the lens assembly 1 in the step hole or adding a thin gasket between the lens assembly 1 and the movable seat 21 to ensure the stability of the optical path of the lens during the adjustment process.

[0026] Precision assembly and calibration of adjustment mechanism 2 Apply a small amount of special lubricant to the corresponding groove at the bottom of the moving seat 21, and place the polymer nesting 22 smoothly into the groove to ensure that its installation position is accurate. Take the polymer gland 23, pass the four screws through the gland holes and align them with the threaded holes of the moving seat 21, and use a torque wrench to tighten the screws evenly according to the specified torque so that the polymer gland 23 is tightly pressed against the polymer nesting 22.

[0027] During the installation process, use a feeler gauge to check the uniformity of the gap between the polymer gland 23 and the polymer nest 22. The gap deviation is controlled within 0.03mm to prevent the polymer nest 22 from being deformed due to uneven pressure or affecting the movement flexibility of the semi-circular ball 241 at the front end of the transmission shaft 24. After the installation is completed, manually rotate the semi-circular ball 241 to check whether it rotates smoothly and whether there is any jamming. If there is any problem, adjust the installation position of the polymer nest 22 or the gland 23 in time.

[0028] Place the guide block 26 in the positioning groove of the centering panel 28, and use a positioning pin or a special fixture to fix its position to ensure that the guide block 26 fits tightly with the positioning groove without obvious gap. Use a high-precision grinder to grind the U-shaped groove of the guide block 26 to ensure that the positioning pin 25 slides smoothly in the U-shaped groove.

[0029] Insert the positioning pin 25 into the middle hole at the lower end of the moving seat 21, and make its head accurately fit into the U-shaped groove of the guide block 26. During the entire range of movement of the moving seat 21, use a dial indicator to monitor the displacement of the positioning pin 25 in the U-shaped groove to ensure that the matching clearance between the positioning pin 25 and the U-shaped groove is between 0.02-0.05mm, and that the positioning pin 25 has no obvious offset or stagnation during the movement, so as to ensure the linear motion accuracy and stability of the moving seat 21.

[0030] Apply an appropriate amount of thread locking agent to the threaded hole on the centering panel 28 where it is screwed to the transmission shaft 24, and screw the threaded nest 27 into the threaded hole using a threaded installation tool. During the screwing process, ensure that the axis of the threaded nest 27 and the threaded hole coincide and the threads fit tightly. After installation, use a thread plug gauge and a ring gauge to check the accuracy of the internal and external threads of the threaded nest 27. If the threads are damaged or the accuracy does not meet the standard, the threaded nest 27 should be replaced in time.

[0031] A simulated loading test is used to apply a certain axial force and torque to the transmission shaft 24 to simulate the actual working state, observe the threaded transmission between the threaded nest 27 and the transmission shaft 24, and check whether there is any thread loosening, wear or jamming to ensure that the threaded nest 27 can stably and reliably realize the translational movement of the transmission shaft 24 during long-term use.

[0032] Align the semicircular ball 241 at the front end of the transmission shaft 24 with the installed polymer nesting 22, and slowly insert it to ensure that the semicircular ball 241 fits tightly with the polymer nesting 22 and can rotate freely. During the insertion process, use an optical microscope to observe the contact between the semicircular ball 241 and the polymer nesting 22 to ensure that the contact area is uniform and there is no local extrusion or excessive gap.

[0033] The external thread 242 in the middle of the transmission shaft 24 passes through the threaded nest 27 on the centering panel 28, and the transmission shaft 24 is manually rotated to make it initially mesh with the threaded nest 27. Use a dial indicator to measure the axial play and radial runout of the transmission shaft 24. If they are out of range, they can be solved by adjusting the installation position of the transmission shaft 24, checking the installation accuracy of the threaded nest 27, or replacing a suitable transmission shaft 24.

[0034] Automatic centering The motor connection base 31 is fixed to the centering panel 28 by means of positioning pins and high-strength bolts. During the installation process, a level and a square are used to calibrate the horizontality and verticality of the motor connection base 31 to ensure the accuracy of the motor installation plane.

[0035] Install the hollow motor 33 on the motor connecting seat 31, and tighten the hollow motor 33 with the set screw. After installation, use a dial indicator to detect the radial runout of the output shaft of the hollow motor 33, install the hexagonal sleeve 32 on the front output shaft of the hollow motor 33, ensure that the hexagonal sleeve 32 is coaxial with the motor output shaft, and fix it with the set screw.

[0036] Insert the outer hexagon 243 at the rear end of the transmission shaft 24 into the inner hexagon socket 32, check the tightness and flexibility of the plug-in fit, connect the motor drive power supply and control system, and conduct a motor test run. Use a laser interferometer to measure the displacement accuracy of the transmission shaft 24. Within one rotation of the motor, the deviation between the theoretical displacement of the transmission shaft 24 and the actual displacement should be controlled within ±0.01mm.

[0037] Manual centering Install the manual adjustment knob 4 at the outer hexagon 243 of the transmission shaft 24, align the mounting hole of the adjustment knob 4 with the outer hexagon 243 of the transmission shaft 24, insert the high-strength stop screw, and apply an appropriate amount of thread locking agent on the thread before tightening the stop screw to prevent loosening.

[0038] After the manual adjustment knob 4 is installed, check the integrity and clarity of the anti-skid texture on its surface to ensure that the operator can hold it stably during the adjustment process. The operator manually rotates the adjustment knob 4 to feel the operating feel and torque. The torque should be moderate to ensure accurate adjustment without causing operational difficulties or damage to the device due to excessive torque. By rotating the adjustment knob 4, the transmission shaft 24 is driven to rotate, and the movement of the moving seat 21 and the lens assembly 1 is observed to check whether there is any jamming or abnormal resistance. If there is a problem, it is necessary to readjust the installation position of the adjustment knob 4 and the transmission shaft 24 or check the assembly accuracy of related components.

[0039] Integration and practical application of the device in laser cutting equipment Install the debugged laser cutting head focusing lens group centering device to the corresponding position of the laser cutting equipment, and use high-strength bolts and positioning pins to connect it to ensure that the device is firmly and reliably connected to the mechanical structure of the equipment, and the flatness error of the connection part is controlled within ±0.05mm to ensure that the device is not displaced or loosened during the operation of the equipment.

[0040] The control module of the centering device is integrated into the laser cutting equipment control system, and a special control program is written to achieve seamless connection between the equipment operation interface and the centering device. The operator can conveniently operate the centering device on the equipment console to perform lens centering operations. At the same time, the equipment control system can monitor the working status of the centering device in real time and feed back this information to the operation interface display, so that the operator can timely understand the operation status of the device and perform fault diagnosis.

[0041] During the laser cutting process, the focusing lens group is accurately centered through the centering device according to different processing materials, material thickness and process requirements. When cutting thick metal plates, a larger laser power and a lower cutting speed are required. At this time, it is necessary to ensure that the lens assembly 1 is in the best focusing position to ensure that the laser energy can effectively penetrate the plate and the cutting surface is smooth. During the processing, if the cutting quality is found to be reduced or deviation occurs, the operator can make fine adjustments in time through the centering device without interrupting the processing process, effectively improving production efficiency and processing quality stability.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centering device for a focusing lens group of a laser cutting head, characterized in that: The invention comprises an adjustment mechanism (2), a lens assembly (1) mounted on the adjustment mechanism (2), and a driving assembly for driving the adjustment mechanism (2) to adjust the lens. The adjustment mechanism (2) comprises a centering panel (28) for mounting the driving assembly, a transmission shaft (24) screwed to the centering panel (28), and a moving seat (21) connected to the top of the transmission shaft (24). The front end of the transmission shaft (24) is inserted into a polymer nesting (22) at the bottom of the moving seat (21), and a polymer pressure cover (23) is fixed below the polymer nesting (22). A guide block (26) is mounted at the middle of the lower end of the moving seat (21) via a positioning pin (25). A threaded nesting (27) is mounted on the centering panel (28) at a position screwed to the transmission shaft (24), and the rear end of the transmission shaft (24) is connected to the driving assembly.

2. The laser cutting head focusing lens assembly centering device according to claim 1, characterized in that: The lens assembly (1) comprises a central annular lens barrel (12), a lens (13) mounted inside the lens barrel (12), a lens ring support (14) supporting the bottom of the lens (13), and a pressing cover (11) pressing the lens (13) at the upper end. The lens assembly (1) is mounted and fixed inside a circular hole of a movable seat (21).

3. The laser cutting head focusing lens assembly centering device according to claim 1, characterized in that: The transmission shaft (24) comprises an external hexagon (243) connected to the electric drive assembly (3), an external thread (242) in the middle threadedly connected to the center adjustment panel (28), and a semicircular ball (241) at the front end inserted into the polymer nest (22).

4. The laser cutting head focusing lens assembly centering device according to claim 1, characterized in that: A U-shaped groove is provided in the middle of the guide block (26), and the positioning pin (25) is inserted inside the U-shaped groove.

5. The laser cutting head focusing lens assembly centering device according to claim 1, characterized in that: The driving component adopts one of an electric driving component (3) and a manual adjustment knob (4).

6. The laser cutting head focusing lens assembly centering device according to claim 5, characterized in that: The electric drive assembly (3) comprises a motor connection seat (31) fixed on the centering panel (28), a hollow motor (33) mounted on the motor connection seat (31), and a hexagon socket (32) connected to the front output shaft of the hollow motor (33), wherein the hexagon socket (32) is plugged into the transmission shaft (24).

7. The centering device for focusing lens assembly of a laser cutting head according to claim 1, characterized in that: The polymer nest (22) and the polymer gland (23) are made of a high-performance polymer material with good self-lubricating properties, so as to reduce friction and wear between the front semicircular ball (241) of the transmission shaft (24) and the polymer nest (22), and the four screws thereof press the polymer nest (22).

8. The centering device for focusing lens assembly of a laser cutting head according to claim 1, characterized in that: The threaded nest (27) is made of a high-strength wear-resistant alloy material, ensuring that the transmission shaft (24) can stably translate forward and backward when rotating, thereby accurately driving the moving seat (21) to move, thereby achieving accurate centering of the lens assembly (1).

9. The laser cutting head focusing lens assembly centering device according to claim 2, characterized in that: The lens assembly (1) is installed in the step hole of the adjustment mechanism (2) by means of a high-precision custom screw; the screw is made of a special alloy material that is rust-proof and has a certain elasticity; the lens assembly (1) is firmly fixed inside the circular hole of the moving seat (21) by means of the limiting effect of the step hole and the tightening force of the screw.

10. The laser cutting head focusing lens assembly centering device according to claim 5, characterized in that: The manual adjustment knob (4) has a non-slip texture on its surface. The adjustment knob (4) is fixed in relative position with the transmission shaft (24) by a high-strength stop screw. The stop screw adopts an anti-loosening design. During the process of manually rotating the adjustment knob (4), the tightness of the connection between the adjustment knob and the transmission shaft (24) can be ensured to avoid looseness or displacement. By manually rotating the adjustment knob (4), the rotation of the transmission shaft (24) can be accurately controlled, thereby achieving precise displacement of the moving seat (21) and the lens assembly (1).

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