A laser head capable of assisted height adjustment

Abstract

The utility model discloses a kind of laser heads that can be assisted to adjust height, including shell, the inner chamber of shell is equipped with lens assembly, top is equipped with optical fiber head, bottom is equipped with connecting barrel, telescopic barrel is slidably sleeved in the cavity of connecting barrel, the bottom of telescopic barrel is equipped with boss, its surface two sides are connected with the bottom two sides of connecting barrel respectively by spring, to make boss and connecting barrel between formation telescopic space, the bottom of boss is equipped with nozzle, copper needle is connected for measuring the capacitance value between the bottom end face of nozzle and board between, contact type displacement sensor is built-in in the lateral wall of connecting barrel, contact type displacement sensor is arranged along the telescopic direction of telescopic barrel, and its contact is placed in telescopic space and the surface contact of boss to measure the telescopic displacement of nozzle;Copper needle, contact type displacement sensor are electrically connected with numerical control system by wire.The utility model can be applicable to the laser cutting of different thickness and different material board, effectively improve the adaptability of laser head cutting.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting technology, and in particular to a laser head with adjustable height. Background Technology

[0002] To ensure that the distance between the cutting tip and the workpiece remains within a certain height during operation, laser cutting machines are typically equipped with an automatic height adjustment device. Currently, most laser cutting machines on the market use capacitive height adjustment, which works by creating a capacitor between two plates—a capacitor sensing ring and the workpiece—and the capacitance value is related to the distance between them.

[0003] However, in the field of high-power lasers, due to the continuous increase in laser power, the thickness of the processed metal plates also increases. During laser processing, the amount of slag in the molten pool of the plate kerf increases. At the same time, due to the increase in energy density, plasma is easily formed between the kerf and the nozzle. Plasma and slag greatly interfere with the laser head based on the capacitance adjustment principle. Therefore, the capacitance adjustment principle is not suitable for cutting thick metal plates. In addition, the above-mentioned capacitance adjustment principle is generally only applicable to cutting metal materials. When cutting non-metallic materials, since non-metallic materials are not conductive, they cannot generate gap capacitance with the nozzle. That is, the nozzle cannot sense the capacitance value and therefore cannot determine the distance between the nozzle and the workpiece. Therefore, in the existing technology, when cutting non-metallic materials, it is usually necessary to turn off the capacitance adjustment device and raise the cutting gun to a certain height for cutting. However, when the workpiece surface is uneven, the cutting head cannot sense the change in distance from the plate, which will lead to the danger of the cutting gun colliding.

[0004] Therefore, there is an urgent need to design an auxiliary height adjustment device suitable for different thicknesses and materials to improve the adaptability of laser head cutting. Utility Model Content

[0005] This invention provides a laser head with adjustable height. By using a capacitor or displacement sensor to assist in adjusting the height, the distance between the nozzle and the surface of the material is detected, and the nozzle is adjusted accordingly. This ensures the stability of laser processing and is applicable to laser cutting of materials of different thicknesses and materials, effectively improving the adaptability of the laser head for cutting.

[0006] The technical solution of this utility model is as follows: A height-adjustable laser head includes a housing with a lens assembly inside. The top of the housing has an optical fiber head for laser output, and the bottom has a connecting cylinder. A telescopic cylinder is slidably fitted inside the connecting cylinder, and the inner cavity of the telescopic cylinder communicates with the inner cavity of the housing. A boss is located at the bottom of the telescopic cylinder, and springs connect the two sides of the boss's surface to the two sides of the bottom of the connecting cylinder, creating a telescopic space between the boss's surface and the bottom of the connecting cylinder. A nozzle is mounted at the bottom of the boss, and a copper needle is connected to the nozzle to measure the capacitance between the bottom end face of the nozzle and a plate. A contact displacement sensor is built into the side wall of the connecting cylinder, arranged along the telescopic direction of the telescopic cylinder. Its contact is placed within the telescopic space and contacts the surface of the boss to measure the telescopic displacement of the nozzle. The copper needle and the contact displacement sensor are electrically connected to a CNC system via wires.

[0007] The laser head is mounted on the machine tool's three-dimensional moving mechanism. The CNC system is an integral part of the machine tool. The fiber optic connector is connected to the laser generator, which is also mounted on the machine tool. The laser generator emits laser light through the fiber optic connector. The laser light is focused onto the nozzle by a lens assembly and then emitted from the nozzle for cutting. The laser generator is electrically connected to the CNC system and controlled by the system. The CNC system receives capacitive signals from the copper needle or displacement signals from a contact displacement sensor in real time. The CNC system uses the received signals to control the machine tool's Z-axis, which moves the laser head to follow the nozzle, ensuring that the distance between the nozzle and the material surface remains within a set range, thus improving the stability of laser cutting.

[0008] When the laser head cuts a thin metal sheet, the CNC system selects capacitor-assisted height adjustment. At this time, the system collects the capacitance signal detected by the copper needle in real time and disconnects the displacement signal received from the contact displacement sensor. The CNC system controls the Z-axis to make the nozzle follow the plate based on the capacitance value between the bottom plane of the nozzle and the plate. The capacitance value reflects the real-time distance between the nozzle and the plate surface. Due to the following movement of the nozzle, the bottom end face of the nozzle is always kept within the set distance from the plate surface when the laser emitted from the nozzle cuts, realizing effective laser focusing and ensuring the stability of the cutting.

[0009] When the laser head cuts thick metal plates or non-metallic sheets, the CNC system selects a displacement sensor for assisted height adjustment. At this time, the system acquires the displacement signal from the contact displacement sensor in real time, disconnects the capacitor signal detected by the copper needle, and first controls the machine tool's Z-axis to move towards the sheet material until the laser head nozzle contacts the sheet surface, compressing the contact displacement sensor's contact at coordinate B. Coordinate B is recorded as the zero point of movement. Then, laser cutting begins. When the contact displacement sensor's contact reaches coordinate ≥ coordinate C (upper extension limit, at which point the contact is in a compressed and shortened state), the CNC system controls the Z-axis to move upward, causing the contact to spring back and extend downward to coordinate B. When the contact displacement sensor's contact reaches coordinate ≤ coordinate A (lower extension limit, at which point the contact is in a naturally extended state), the CNC system controls the Z-axis to move downward, causing the contact to be compressed and retract upward to coordinate B. When the contact displacement sensor's contact coordinate is between coordinates C and A, the Z-axis is not controlled. Through the above-mentioned follow-up control, when the laser emitted from the nozzle is cutting, the end face of the bottom of the nozzle is always kept within the set distance from the surface of the plate, so as to achieve effective laser focusing and ensure the stability of the cutting.

[0010] It should be noted that the control principles and signal transmission methods involved in receiving signals from the CNC machine tool to control the Z-axis to make the nozzle at the bottom of the laser head follow the movement are well-known to those skilled in the art and will not be described here. Meanwhile, the coordinates A, B, and C of the contact mark in the CNC system can be set by the operator in the system according to the actual situation. The coordinate range indicated here corresponds to the upper and lower limits of the expansion and contraction of the displacement signal collected by the contact displacement sensor, referring to the Z-axis displacement of the contact in the vertical direction. The coordinates only change the displacement on the Z-axis. The above principles and setting process are well-known to those skilled in the art and will not be described further.

[0011] Furthermore, the inner wall of the connecting cylinder is provided with an annular sliding groove, and the top end of the telescopic cylinder is provided with an annular limiting protrusion. The limiting protrusion is placed in the sliding groove, and the sliding distance of the limiting protrusion along the sliding groove is equal to the extension stroke of the spring.

[0012] When the telescopic cylinder extends or retracts relative to the connecting cylinder under the action of the spring, a limiting protrusion at the end of the telescopic cylinder limits its movement within the sliding groove. This ensures that the telescopic cylinder extends or retracts within a certain range, and the limiting effect enhances the stability of the extension and retraction. The sliding distance of the sliding groove corresponds to the extension and retraction stroke of the spring, avoiding interference with the normal extension and retraction of the telescopic cylinder.

[0013] Furthermore, a ceramic body is fixed to the bottom of the boss by a locking ring. The inner cavity of the ceramic body is connected to the inner cavity of the telescopic cylinder. The nozzle is installed at the bottom of the ceramic body. The copper needle is placed inside the ceramic body, with one end connected to the nozzle and the other end electrically connected to the CNC system via a wire.

[0014] One end of the copper needle is connected to the nozzle. During laser cutting, an inter-plate capacitance is formed between the bottom end face of the nozzle and the thin metal plate. The size of the capacitance is related to the distance between the two. The real-time size of the inter-plate capacitance can be measured by the copper needle. Then, the CNC system controls the Z-axis movement of the laser head in real time according to the real-time size of the capacitance, so that the distance between the nozzle and the plate is always kept within the set range, that is, not exceeding the set capacitance value range, so as to realize the nozzle follow-up and ensure the stability of cutting.

[0015] Furthermore, a first wire groove runs through one side of the boss, and a second wire groove runs through the side wall of the connecting cylinder. The wire at the top of the copper needle passes through the first wire groove and the second wire groove in sequence and is electrically connected to the CNC system.

[0016] The wires connecting the copper needle to the outside are neatly stored in two wire slots, resulting in a clean appearance. The placement of the wires is also reasonably arranged to avoid the wires affecting the movement of the laser head.

[0017] Furthermore, a signal amplifier is fixed to the outer wall of the housing, and the wire at the top of the copper needle passes through the second wire groove and is connected to the input terminal of the signal amplifier. The output terminal of the signal amplifier is electrically connected to the CNC system.

[0018] The capacitance signal detected by the copper needle is amplified by a signal amplifier and then output to the CNC system to improve the stability of the transmitted signal and avoid signal interference.

[0019] Furthermore, the side wall of the connecting cylinder is provided with an axially oriented mounting cavity, and the contact displacement sensor is installed in the mounting cavity. Its bottom contact contacts the surface of the boss, and a wire is connected to its top. The wire extends out of the mounting cavity and connects to the CNC system.

[0020] By embedding the contact displacement sensor inside the inner wall of the connecting cylinder, not only is external installation space saved, but the overall aesthetics of the laser head are also improved.

[0021] Furthermore, a cable connector is fixed to the outer wall of the housing, and the wire at the top of the contact displacement sensor passes through the mounting cavity and connects to the input end of the cable connector. The output end of the cable connector is electrically connected to the CNC system.

[0022] By transmitting the displacement signal detected by the contact displacement sensor to the CNC system through a cable connector, the stability of the transmitted signal can be improved and interference can be avoided.

[0023] Furthermore, the lens assembly includes an upper protective lens, a collimating lens, a focusing lens, and a lower protective lens, which are arranged sequentially from top to bottom within the cavity of the housing.

[0024] Furthermore, the housing has mounting holes on both sides for mounting on a machine tool.

[0025] Furthermore, the fiber optic head is fixed to the top of the housing via a connector.

[0026] The beneficial effects of this utility model are as follows: This invention features two height adjustment modes: one assisted by capacitance and the other by a displacement sensor. When processing thick metal or non-metal materials, the displacement sensor-assisted height adjustment mode ensures the stability of laser processing and avoids the risk of laser head collision. When processing thin metal sheets, the traditional capacitance-assisted height adjustment mode ensures high responsiveness and follow-through. This invention is suitable for laser cutting of sheets of different thicknesses and materials, effectively improving the adaptability of the laser head. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the laser head of this utility model; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the nozzle contacting the surface of the plate. Figure 5 This is a schematic diagram of the extension range when the contact displacement sensor assists in height adjustment.

[0028] In the diagram: 1. Housing; 2. Protective lens; 3. Collimating lens; 4. Focusing lens; 5. Lower protective lens; 6. Fiber optic head; 7. Connecting cylinder; 8. Connector; 9. Telescopic cylinder; 10. Boss; 11. Spring; 12. Locking ring; 13. Ceramic body; 14. Nozzle; 15. Copper needle; 16. Contact displacement sensor; 17. Contact; 18. Mounting hole; 19. Sliding groove; 20. Limiting protrusion; 21. First wire groove; 22. Second wire groove; 23. Signal amplifier; 24. Cable connector. Detailed Implementation

[0029] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0030] Example 1: like Figures 1-3 As shown, an adjustable laser head includes a housing 1. The inner cavity of the housing 1 contains a lens assembly, which includes an upper protective lens 2, a collimating lens 3, a focusing lens 4, and a lower protective lens 5 arranged sequentially from top to bottom within the inner cavity of the housing 1. The top of the housing 1 has an optical fiber head 6 for laser output, and the bottom has a connecting cylinder 7. The optical fiber head 6 is fixed to the top of the housing 1 via a connector 8 and is connected to a laser generator (not shown). The laser generator is controlled by a CNC system. A telescopic cylinder 9 is slidably fitted inside the cavity of the connecting cylinder 7. The inner cavity of the telescopic cylinder 9 communicates with the inner cavity of the housing 1. The bottom of the telescopic cylinder 9 has a boss 10. The two sides of the surface of the boss 10 are connected to the two sides of the bottom of the connecting cylinder 7 via springs 11, creating a telescopic space between the surface of the boss 10 and the bottom of the connecting cylinder 7. The bottom of the boss 10 is secured by a lock. A ceramic body 13 is fixed to a tight ring 12. The inner cavity of the ceramic body 13 is connected to the inner cavity of the telescopic cylinder 9. A metal nozzle 14 is installed at the bottom of the ceramic body 13. The laser beam emitted by the fiber optic head 6 is focused at the nozzle 14 by the lens assembly and is emitted from the nozzle 14 for cutting. A copper needle 15 is built into the ceramic body 13. One end of the copper needle 15 is connected to the nozzle 14, and the other end is electrically connected to the CNC system through a wire. The copper needle 15 is used to measure the capacitance value between the bottom end face of the nozzle 14 and the plate. An installation cavity is opened along the axial direction on the side wall of the connecting cylinder 7. A contact displacement sensor 16 is installed in the installation cavity. The contact displacement sensor 16 is arranged along the telescopic direction of the telescopic cylinder 9. Its bottom contact 17 is placed in the telescopic space and contacts the surface of the boss 10 to measure the telescopic displacement of the nozzle 14. A wire is connected to the top, and the wire extends out of the installation cavity and connects to the CNC system.

[0031] In this embodiment, mounting holes 18 are provided on both sides of the housing 1 to mount the entire laser head on the three-dimensional moving mechanism of the machine tool. The CNC system on the machine tool is used to control the fiber head 6 to emit laser and receive the capacitance signal of the copper needle 15 or the displacement signal of the contact displacement sensor 16. The CNC system controls the Z-axis of the machine tool to drive the laser head to follow the signal received, so that the nozzle 14 follows the signal, ensuring that the distance between the nozzle 14 and the surface of the plate is within the set range, thereby improving the stability of laser cutting.

[0032] In this embodiment, since an inter-plate capacitance is formed between the bottom end face of the nozzle 14 and the metal sheet, and the size of the capacitance is related to the distance between the two, the real-time size of the inter-plate capacitance can be measured by the copper needle 15. Then, the CNC system controls the Z-axis to move the laser head in real time according to the real-time size of the capacitance, so that the distance between the nozzle 14 and the sheet material is always kept within the set range, that is, not exceeding the set capacitance value range, so as to realize the follow-up of the nozzle 14.

[0033] When the laser head cuts a thin metal sheet, the CNC system selects capacitor-assisted height adjustment. At this time, the system collects the capacitance signal detected by the copper needle 15 in real time and disconnects the displacement signal received from the contact displacement sensor 16. The CNC system controls the Z-axis to make the nozzle 14 follow the capacitance value between the bottom plane of the nozzle 14 and the sheet material. The capacitance value reflects the real-time distance between the nozzle 14 and the sheet material surface. Due to the following movement of the nozzle 14, when the laser emitted from the nozzle 14 cuts, the bottom end face of the nozzle 14 is always kept within the set distance from the sheet material surface, realizing effective laser focusing and ensuring the stability of the cutting.

[0034] like Figure 4 and Figure 5 As shown, when the laser head cuts a thick metal plate or a non-metallic sheet, the CNC system selects a displacement sensor for auxiliary height adjustment. At this time, the system collects the displacement signal of the contact displacement sensor 16 in real time, disconnects the capacitor signal detected by the copper needle 15, and the CNC system first controls the machine tool Z-axis to move towards the sheet until the nozzle 14 of the laser head contacts the surface of the sheet, and compresses the contact 17 of the contact displacement sensor 16 to coordinate B. Coordinate B is recorded as the zero point of movement, and then laser cutting begins. When the contact 17 of the contact displacement sensor 16 reaches... When the contact point 17 reaches coordinate C (the upper limit of extension / retraction, at which point the contact 17 is in a compressed and shortened state), the CNC system controls the Z-axis to move upward, causing the contact 17 to spring back and extend downward to coordinate B. When the contact point 17 of the contact displacement sensor 16 reaches coordinate A (the lower limit of extension / retraction, at which point the contact 17 is in a naturally extended state), the CNC system controls the Z-axis to move downward, causing the contact 17 to be compressed and retracted upward until coordinate B. When the coordinate of the contact point 17 of the contact displacement sensor 16 is between coordinates C and A, the Z-axis is not controlled. Through the above-mentioned follow-up control, when the laser emitted from the nozzle 14 is cutting, the end face of the bottom of the nozzle 14 is always kept within the set distance from the surface of the plate, achieving effective laser focusing and ensuring cutting stability.

[0035] It should be noted that the control principle and signal transmission method involved in receiving signals from the CNC machine tool to control the Z-axis to make the nozzle 14 at the bottom of the laser head follow the movement are technologies known to those skilled in the art and will not be described here. Meanwhile, the coordinates A, B, and C marked on the contact 17 in the CNC system can be set by the operator in the system according to the actual situation. The coordinate range indicated here corresponds to the upper and lower limits of the expansion and contraction of the displacement signal collected by the contact displacement sensor 16, referring to the Z-axis displacement of the contact 17 in the vertical direction. The coordinates only change the displacement on the Z-axis. The above principles and setting process are known to those skilled in the art and will not be described further.

[0036] See Figure 2 In this embodiment, the inner wall of the connecting cylinder 7 is provided with an annular sliding groove 19, and the top end of the telescopic cylinder 9 is provided with an annular limiting protrusion 20. The limiting protrusion 20 is placed in the sliding groove 19, and the sliding distance of the limiting protrusion 20 along the sliding groove 19 is equal to the extension stroke of the spring 11.

[0037] When the telescopic cylinder 9 extends or retracts relative to the connecting cylinder 7 under the action of the spring 11, the limiting protrusion 20 at the end of the telescopic cylinder 9 limits its movement within the sliding groove 19, ensuring that the telescopic cylinder 9 extends or retracts within a certain range. Furthermore, the limiting action enhances the stability of the extension and retraction. The sliding distance of the sliding groove 19 corresponds to the extension and retraction stroke of the spring 11, avoiding interference with the normal extension and retraction of the telescopic cylinder 9.

[0038] In this embodiment, the contact displacement sensor 16 is built into the inner wall of the connecting cylinder 7, which not only saves external installation space but also improves the aesthetics of the entire laser head.

[0039] This invention features two height adjustment modes: one assisted by capacitance and the other by a displacement sensor. When processing thick metal or non-metal materials, the displacement sensor-assisted height adjustment mode ensures the stability of laser processing and avoids the risk of laser head collision. When processing thin metal sheets, the traditional capacitance-assisted height adjustment mode ensures high responsiveness and follow-through. This invention is suitable for laser cutting of sheets of different thicknesses and materials, effectively improving the adaptability of the laser head.

[0040] Example 2: This embodiment is similar to Embodiment 1, except that in this embodiment, a first wire groove 21 is passed through one side of the boss 10, a second wire groove 22 is passed through the side wall of the connecting cylinder 7, and the wire at the top of the copper needle 15 passes through the first wire groove 21 and the second wire groove 22 in sequence to be electrically connected to the CNC system.

[0041] In this embodiment, the wires connecting the copper needle 15 to the outside world are stored in two wire slots, resulting in a neat appearance and a reasonable arrangement of the wire placement space to avoid the wires affecting the movement of the laser head.

[0042] Example 3: This embodiment is similar to Embodiment 1, except that in this embodiment, a signal amplifier 23 and a cable connector 24 are fixed on both sides of the outer side wall of the housing 1, respectively. The wire at the top of the copper needle 15 passes through the second wire groove 22 and connects to the input end of the signal amplifier 23. The output end of the signal amplifier 23 is electrically connected to the CNC system. The wire at the top of the contact displacement sensor 16 passes through the mounting cavity and connects to the input end of the cable connector 24. The output end of the cable connector 24 is electrically connected to the CNC system.

[0043] In this embodiment, the capacitance signal detected by the copper needle 15 is amplified by the signal amplifier 23 and then output to the CNC system, which can improve the stability of the capacitance transmission signal and avoid signal interference. In this embodiment, the displacement signal detected by the contact displacement sensor 16 is output to the CNC system after passing through the cable connector 24, which can improve the stability of the displacement transmission signal and avoid signal interference.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A laser head with adjustable height, characterized in that, The device includes a housing (1), the inner cavity of which is provided with a lens assembly. The top of the housing (1) is provided with an optical fiber head (6) for laser output, and the bottom is provided with a connecting cylinder (7). A telescopic cylinder (9) is slidably sleeved inside the cavity of the connecting cylinder (7). The inner cavity of the telescopic cylinder (9) communicates with the inner cavity of the housing (1). The bottom of the telescopic cylinder (9) is provided with a boss (10). The two sides of the surface of the boss (10) are respectively connected to the two sides of the bottom of the connecting cylinder (7) by springs (11), so that a telescopic space is formed between the surface of the boss (10) and the bottom of the connecting cylinder (7). A nozzle (14) is installed at the bottom of the boss (10). The nozzle (14) is connected to a copper needle (15) for measuring the capacitance between the bottom end face of the nozzle (14) and the plate. A contact displacement sensor (16) is built into the side wall of the connecting cylinder (7). The contact displacement sensor (16) is arranged along the extension direction of the telescopic cylinder (9). Its contact (17) is placed in the extension space and contacts the surface of the boss (10) to measure the extension displacement of the nozzle (14). The copper needle (15) and the contact displacement sensor (16) are electrically connected to the CNC system through wires.

2. The laser head with adjustable height according to claim 1, characterized in that, The inner wall of the connecting cylinder (7) is provided with an annular sliding groove (19), and the top end of the telescopic cylinder (9) is provided with an annular limiting protrusion (20). The limiting protrusion (20) is placed in the sliding groove (19), and the sliding distance of the limiting protrusion (20) along the sliding groove (19) is equal to the extension stroke of the spring (11).

3. The laser head with adjustable height according to claim 1, characterized in that, The bottom of the boss (10) is fixed with a ceramic body (13) by a locking ring (12). The inner cavity of the ceramic body (13) is connected to the inner cavity of the telescopic cylinder (9). The nozzle (14) is installed at the bottom of the ceramic body (13). The copper needle (15) is placed inside the ceramic body (13), with one end connected to the nozzle (14) and the other end electrically connected to the CNC system through a wire.

4. The laser head with adjustable height according to claim 3, characterized in that, The boss (10) has a first wire groove (21) through one side, and the connecting cylinder (7) has a second wire groove (22) through its side wall. The wire at the top of the copper needle (15) passes through the first wire groove (21) and the second wire groove (22) in sequence and is electrically connected to the CNC system.

5. The laser head with adjustable height according to claim 4, characterized in that, A signal amplifier (23) is fixed on the outer wall of the housing (1). The wire at the top of the copper needle (15) passes through the second wire groove (22) and is connected to the input end of the signal amplifier (23). The output end of the signal amplifier (23) is electrically connected to the CNC system.

6. The laser head with adjustable height according to claim 1, characterized in that, The side wall of the connecting cylinder (7) is provided with an axially oriented mounting cavity. The contact displacement sensor (16) is installed in the mounting cavity. Its bottom contact (17) is in contact with the surface of the boss (10). A wire is connected to the top of the sensor. The wire extends out of the mounting cavity and is connected to the CNC system.

7. A laser head with adjustable height according to claim 6, characterized in that, A cable connector (24) is fixed to the outer wall of the housing (1). The wire at the top of the contact displacement sensor (16) passes through the mounting cavity and is connected to the input end of the cable connector (24). The output end of the cable connector (24) is electrically connected to the CNC system.

8. The laser head with adjustable height according to claim 1, characterized in that, The lens assembly includes an upper protective lens (2), a collimating lens (3), a focusing lens (4), and a lower protective lens (5), which are arranged sequentially from top to bottom in the inner cavity of the housing (1).

9. A laser head with adjustable height according to claim 1, characterized in that, The housing (1) has mounting holes (18) on both sides for mounting on a machine tool.

10. A laser head with adjustable height according to claim 1, characterized in that, The fiber optic head (6) is fixed to the top of the housing (1) by a connector (8).

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