Laser cutting equipment for ensuring the strength of a blind hole connection of a power distribution cabinet

Abstract

The application relates to the technical field of laser processing equipment, in particular to laser cutting equipment for guaranteeing the connecting strength of blind holes of a power distribution cabinet, which comprises a machine tool main machine, a laser generator, a numerical control system and a cutting head, an airflow distribution mechanism is arranged on the inside of the cutting head; the airflow distribution mechanism comprises a shell, a sliding base and a driving assembly, an air inlet pipe is arranged on the side wall of the shell, an annular cavity is arranged in the shell, and a sliding cavity is arranged on the inner wall of the annular cavity; an air inlet is arranged at the upper end of the sliding cavity, and an air outlet and a pressure relief channel communicating with the air outlet are arranged at the lower end of the sliding cavity; through the arrangement of the airflow distribution mechanism, the driving assembly is used to control the transient axial lifting of the sliding base, under the premise of not breaking the upstream total gas source, the high-pressure gas is discharged outward through the pressure relief channel with smaller resistance in the microsecond moment when the laser is turned off. The positive blowing pressure at the bottom nozzle is suddenly reduced, the cold quenching effect of the high-pressure cold gas on the blind hole connecting point is blocked, and the short-circuit hidden danger that the cable of the power distribution cabinet is cut is avoided.

Description

Technical Field

[0001] This invention relates to the field of laser processing equipment technology, specifically to a laser cutting device that ensures the strength of blind hole connections in power distribution cabinets. Background Technology

[0002] In the sheet metal processing of electrical distribution cabinets, to prevent cut parts from warping or falling directly and causing collisions with the machine tool, tiny uncut connection points (commonly known in the industry as "blind holes" or "knockout holes") are usually left on the cutting trajectory. These are then manually knocked off by workers after the entire board is processed. When processing such blind holes, existing laser cutting equipment uses a very short laser cut-off command when passing the pre-reserved connection point, causing the laser to extinguish instantly, thus preserving the physical connection on the sheet metal. However, there is an inherent delay in system response and gas dynamics. The high-pressure auxiliary gas in existing equipment is usually controlled by the upstream main gas valve. When the laser is instantly turned off, due to the long gas pipeline and the sluggish response of the mechanical gas valve, high-pressure cold air or nitrogen continues to be ejected from the nozzle at the bottom of the cutting head. Because the high-pressure cold air continuously blows directly onto the blind hole connection point, which is in a high-temperature molten state after cutting, it produces a severe "cold quenching effect," causing a change in the metal crystal phase at the connection point, making the material instantly brittle and hard. This results in workers easily creating sharp metal burrs, like blades, when knocking off and separating parts. These hidden burrs can easily tear the cable insulation layer during subsequent wiring and assembly of the distribution cabinet, causing short circuits or leakage accidents, which restricts the safety of the distribution cabinet and the efficiency of automated mass production. Summary of the Invention

[0003] To address the aforementioned issues, a laser cutting device is provided to ensure the strength of blind hole connections in power distribution cabinets. This device utilizes an airflow distribution mechanism and a drive assembly to control the transient axial lifting of the sliding base. Without disconnecting the upstream main air source, high-pressure gas is discharged outwards through a pressure relief channel with lower resistance in the microseconds following laser shutdown. This causes a sharp drop in the forward blowing pressure at the bottom nozzle, preventing the cold quenching effect of the high-pressure cold air on the blind hole connection point and avoiding the short-circuit hazard of the power distribution cabinet cables being cut.

[0004] To address the problems of existing technologies, this invention provides a laser cutting device for ensuring the strength of blind hole connections in power distribution cabinets. The device includes a machine tool host, a laser generator, a CNC system, and a cutting head. The cutting head has a protective mirror inside, and an airflow distribution mechanism is provided between the protective mirror and the bottommost nozzle. The airflow distribution mechanism includes: a housing with an air inlet pipe on its side wall and an annular cavity inside, the inner wall of which has a sliding cavity; an air inlet at the upper end of the sliding cavity and an air outlet and a pressure relief channel connecting to the air outlet at the lower end; and a sliding base with a hollow interior. The sliding base forms the main air passage and is slidably disposed within the sliding cavity, capable of sliding along its axial direction. The bottom of the sliding base has a tapered through hole that matches the nozzle and connects to the internal main air passage. A drive assembly, disposed within the sliding cavity, is used to drive the sliding base to perform axial displacement. In the working state, the drive assembly applies an axial force to seal the mating part of the sliding base with the nozzle, closing the through hole. In the depressurization state, the sliding base is axially lifted, causing the mating part to disengage from the seal, and the through hole connects with the air outlet at the bottom of the sliding cavity, allowing the airflow to be discharged through the depressurization channel.

[0005] Preferably, the outer wall of the sliding base extends circumferentially to form a first force-receiving part and a second force-receiving part; the driving assembly includes a first force-applying member and a second force-applying member, the first force-applying member being sandwiched between the inner top wall of the sliding cavity and the first force-receiving part, and the second force-applying member being sandwiched between the inner bottom wall of the sliding cavity and the second force-receiving part.

[0006] Preferably, the first force-applying component is a first piezoelectric ceramic, and the second force-applying component is an elastic reset component.

[0007] Preferably, the first force-applying component is a second piezoelectric ceramic, and the second force-applying component is a third piezoelectric ceramic; the CNC system alternately controls the expansion and contraction of the second and third piezoelectric ceramics by outputting differential level signals.

[0008] Preferably, the external exhaust direction of the pressure relief channel is opposite to or at an obtuse angle to the downward exhaust direction of the nozzle, so as to prevent the pressure relief airflow from interfering with the processing area downward.

[0009] Preferably, the cross-sectional area of ​​the annular cavity is larger than the air intake cross-sectional area of ​​the air intake pipe, and the total exhaust cross-sectional area of ​​the pressure relief channel is larger than the cross-sectional area of ​​the air outlet hole of the nozzle blowing downwards.

[0010] Preferably, the pressure relief channel includes a plurality of lateral exhaust branches evenly and symmetrically arranged along the circumference of the housing; in the pressure relief state, the airflow is synchronously ejected through the plurality of lateral exhaust branches.

[0011] Preferably, the device further includes a hardware transient distribution module connected in parallel to the laser generator control bus; the hardware transient distribution module is used to intercept the light-off level signal sent by the CNC system and directly output a trigger voltage to the drive component within a microsecond delay, so as to realize hardware-level synchronization of optical path cutoff and mechanical pressure relief action.

[0012] Preferably, the CNC system integrates a constant speed algorithm module; when the cutting head executes the trajectory of the blind hole reserved connection point area and triggers the pressure relief state, the CNC system controls the servo driver of the machine tool host to maintain the current tangent synthesis speed for uniform circular interpolation, and shields deceleration or stop commands.

[0013] Preferably, a miniature absolute pressure sensor is also integrated within the sliding cavity.

[0014] The advantages of this invention compared to the prior art are: 1. This invention, by setting up an airflow distribution mechanism and using a drive component to control the transient axial lifting of the sliding base, allows high-pressure gas to be discharged outward through a pressure relief channel with lower resistance in the microsecond instant of laser shutdown, without disconnecting the upstream main air source. This causes a sudden drop in the forward blowing pressure at the bottom nozzle, fundamentally blocking the quenching effect of high-pressure cold gas on the blind hole connection point. As a result, the final knocked-off micro-connection point retains the original toughness of the metal, with a clean and burr-free fracture surface, eliminating metal burrs caused by brittle fracture. 2. This invention provides an absolutely stable axial guide and static reaction force support point for the high-frequency micro-motion of the sliding base by extending a first force-bearing part and a second force-bearing part circumferentially on the outer wall of the sliding base, and setting the first force-applying member and the second force-applying member on the inner wall of the sliding cavity and the sides of the first force-bearing part and the second force-bearing part, respectively. This ensures the sealing and alignment accuracy of the tapered mating part during the microsecond-level start-stop process, avoids the mechanism jamming or off-center load leakage caused by unilateral force, and ensures the efficient synchronization of pressure relief and diversion action and laser light cutting action from a physical and mechanical perspective, thereby serving a reliable solution to the blind hole quenching problem.

[0015] 3. This invention combines a first piezoelectric ceramic with an elastic reset component. It utilizes the microscopic expansion of the first piezoelectric ceramic upon energization to overcome the preload of the reset spring, achieving high-pressure sealing. Furthermore, it leverages the rapid contraction of the first piezoelectric ceramic upon de-energization, combined with the potential energy of the elastic component, to achieve rapid lifting. This structure significantly reduces the mechanical transmission lag time of traditional cylinders or motor valves, increasing the mechanical displacement response speed to sub-millisecond levels. This ensures that the depressurization speed of the airflow distribution mechanism matches the laser generator's light-off speed, allowing the airflow bypass evacuation effect to precisely act on each blind hole connection process. Attached Figure Description

[0016] Figure 1A three-dimensional structural diagram of a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. Figure 1 .

[0017] Figure 2 A three-dimensional structural diagram of a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. Figure 2 .

[0018] Figure 3 This is a three-dimensional structural diagram of the airflow distribution mechanism in a laser cutting device that ensures the strength of blind hole connections in a power distribution cabinet.

[0019] Figure 4 This is a cross-sectional structural schematic diagram of the first embodiment of the airflow distribution mechanism in a laser cutting device that ensures the strength of blind hole connections in a power distribution cabinet.

[0020] Figure 5 This is a three-dimensional cross-sectional structural diagram of the first embodiment of the airflow distribution mechanism in a laser cutting device that ensures the strength of blind hole connections in a power distribution cabinet.

[0021] Figure 6 A schematic cross-sectional view of the first embodiment of the airflow distribution mechanism in a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. Figure 2 .

[0022] Figure 7 A schematic cross-sectional view of the airflow distribution mechanism in a second embodiment of a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. Figure 1 .

[0023] Figure 8 A schematic cross-sectional view of the airflow distribution mechanism in a second embodiment of a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. Figure 2 .

[0024] Figure 9 yes Figure 8 Enlarged view of point A in the middle.

[0025] Figure 10 This is an exploded view of a laser cutting device that ensures the strength of blind hole connections in electrical distribution cabinets.

[0026] The following components are labeled in the diagram: 1. Cutting head; 2. Airflow distribution mechanism; 21. Protective mirror; 22. Housing; 221. Air inlet pipe; 222. Annular cavity; 23. Sliding cavity; 231. Air inlet; 232. Air outlet; 2321. Pressure relief channel; 233. Sliding base; 2331. Through hole; 2332. First force-bearing part; 2333. Second force-bearing part; 2334. Fitting part; 234. Drive assembly; 2341. First force-applying component; 23411. First piezoelectric ceramic; 23412. Second piezoelectric ceramic; 2342. Second force-applying component; 23421. Elastic reset component; 23422. Third piezoelectric ceramic; 235. Miniature absolute pressure sensor; 24. Nozzle. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5 , Figure 9 and Figure 10 The image shows a laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet. The device includes a machine tool host, a laser generator, a CNC system, and a cutting head 1. The cutting head 1 has a protective mirror 21 inside, and an airflow distribution mechanism 2 is provided between the protective mirror 21 and the bottommost nozzle 24. The airflow distribution mechanism 2 includes: a housing 22 with an air inlet pipe 221 on its side wall and an annular cavity 222 inside. The inner wall of the annular cavity 222 has a sliding cavity 23. The upper end of the sliding cavity 23 has an air inlet 231, and the lower end has an air outlet 232 and a pressure relief channel 2321 connecting to the air outlet 232. A sliding base 233 is hollow and perforated inside to form a main air passage, and is slidably mounted on... The sliding base 233 is placed inside the sliding cavity 23 and can slide along its axial direction; the bottom of the sliding base 233 has a tapered through hole 2331 that matches the nozzle 24 and connects to the internal main air passage; the driving assembly 234 is disposed inside the sliding cavity 23 and is used to drive the sliding base 233 to perform axial displacement; in the working state, the driving assembly 234 applies an axial force to seal the mating part 2334 of the sliding base 233 with the nozzle 24, thus sealing the through hole 2331; in the depressurization state, the sliding base 233 is axially lifted, causing the mating part 2334 to disengage from the seal, and the through hole 2331 connects with the air outlet 232 at the bottom of the sliding cavity 23, and the airflow is discharged through the depressurization channel 2321.

[0029] In conventional sheet metal cutting of electrical distribution cabinets, laser cutting equipment typically uses the machine tool host to drive the cutting head 1 to move, and high-pressure auxiliary gas to blow away molten metal slag. However, when processing blind holes with burr characteristics, i.e., micro-connection holes, the laser needs to perform an extremely short laser cut-off operation, while the traditional gas main valve usually has a mechanical response delay. This causes the continuously ejected high-pressure cold gas to directly blow onto the micro-connection point that has not yet solidified, triggering a severe quenching effect. This makes the burr brittle and easily produces sharp metal burrs when knocked off during subsequent on-site construction. To effectively solve this problem, this invention provides a laser cutting device that ensures the connection strength of blind holes in electrical distribution cabinets. Specifically, an airflow distribution mechanism 2 is introduced between the protective mirror 21 and the bottom nozzle 24. The airflow distribution mechanism 2 has an air inlet pipe 221 on the side wall of its housing 22, and an annular cavity 222 and a sliding cavity 23 are nested inside it. The upper end of the sliding cavity 23 has an air inlet 231, and the lower end has an air outlet 232 and a pressure relief channel 2321 connecting to the air outlet 232. Inside the sliding cavity 23, a sliding base 233 is slidably provided. The sliding base 233 can move smoothly along the axial direction, and its bottom has a conical through hole 2331 that matches the nozzle 24 and connects to the internal main air passage. In normal continuous cutting operation, the drive assembly 234, located within the sliding cavity 23, applies a downward axial force, forcing the mating part 2334 of the sliding base 233 to achieve a tight seal with the nozzle 24, thereby sealing the through hole 2331. The high-pressure airflow is then allowed to blow directly downwards for cutting. The preferred conical mating part 2334 not only provides a line-contact level high-pressure seal, effectively preventing lateral leakage, but also exhibits a mechanical self-centering effect during high-frequency up-and-down micro-movements. Even after millions of start-stop impacts, the conical structure automatically compensates for microscopic wear, maintaining the long-term sealing life and operational consistency of the airflow distribution mechanism 2 under harsh conditions. When the equipment reaches the pre-reserved connection point in the blind hole and enters a depressurization state, the drive assembly 234 quickly drives the sliding base 233 to lift axially, causing the mating part 2334 to disengage from the seal. At this moment, the through hole 2331 and the air outlet 232 at the bottom of the sliding cavity 23 are instantly connected, and a large amount of airflow in the main air path is discharged to the outside through the less resistant depressurization channel 2321. By using fluid bypass diversion, the forward blowing pressure at the bottom nozzle 24 drops sharply, effectively avoiding the damage to the blind hole connection strength caused by cold air quenching, and ensuring the continuity of high-speed machining operations without having to cut off the upstream main air source.

[0030] like Figures 3 to 5As shown: the outer wall of the sliding base 233 extends circumferentially to form a first force-receiving part 2332 and a second force-receiving part 2333; the driving assembly 234 includes a first force-applying member 2341 and a second force-applying member 2342, the first force-applying member 2341 being sandwiched between the inner top wall of the sliding cavity 23 and the first force-receiving part 2332, and the second force-applying member 2342 being sandwiched between the inner bottom wall of the sliding cavity 23 and the second force-receiving part 2333.

[0031] The first force-applying component 2341 is a first piezoelectric ceramic 23411, and the second force-applying component 2342 is an elastic reset component 23421.

[0032] To further improve the response speed and control accuracy of the axial displacement of the sliding base 233, a first force-bearing part 2332 and a second force-bearing part 2333 extend circumferentially from the outer wall of the sliding base 233. Correspondingly, the drive assembly 234 includes a first force-applying member 2341 and a second force-applying member 2342. The first force-applying member 2341 is sandwiched between the inner top wall of the sliding cavity 23 and the first force-bearing part 2332, while the second force-applying member 2342 is sandwiched between the inner bottom wall of the sliding cavity 23 and the second force-bearing part 2333. As a preferred first embodiment, the force-applying member in the drive assembly 234 can be a precision displacement actuation component such as a miniature pneumatic push rod, an electromagnetic voice coil motor, or a piezoelectric actuator. In a specific embodiment, the first force-applying member 2341 is a first piezoelectric ceramic 23411, and the second force-applying member 2342 is an elastic reset member 23421, such as a disc spring, a wave spring, or a high-tension helical compression spring. When in operation, the first piezoelectric ceramic 23411 expands after being energized, overcoming the preload of the elastic reset member 23421 and pressing the sliding base 233 downwards; when pressure needs to be released, the power is disconnected, the first piezoelectric ceramic 23411 contracts instantly, and the sliding base 233 is quickly lifted under the mechanical rebound force of the elastic reset member 23421.

[0033] like Figures 3 to 5 , Figure 7 and Figure 8 As shown: the first force-applying component 2341 is the second piezoelectric ceramic 23412, and the second force-applying component 2342 is the third piezoelectric ceramic 23422; the CNC system alternately controls the expansion and contraction of the second piezoelectric ceramic 23412 and the third piezoelectric ceramic 23422 by outputting differential level signals.

[0034] In a preferred second embodiment that pursues a higher dynamic response limit, the first force-applying element 2341 is a second piezoelectric ceramic 23412, and the second force-applying element 2342 is a third piezoelectric ceramic 23422. The CNC system alternately controls the expansion and contraction of the second piezoelectric ceramic 23412 and the third piezoelectric ceramic 23422 by outputting two differential level signals with opposite polarities. This active push-pull dual-drive structure effectively overcomes the mechanical fatigue and hysteresis that may exist in a single passive elastic element, further improving the operational reliability of the airflow distribution mechanism 2 under high-frequency start-stop conditions.

[0035] like Figures 3 to 8 As shown: The external exhaust direction of the pressure relief channel 2321 is opposite to or at an obtuse angle to the downward exhaust direction of the nozzle 24, so as to prevent the pressure relief airflow from interfering with the processing area downward.

[0036] The cross-sectional area of ​​the annular cavity 222 is larger than the air intake cross-sectional area of ​​the air intake pipe 221, and the total exhaust cross-sectional area of ​​the pressure relief channel 2321 is larger than the cross-sectional area of ​​the air outlet hole of the nozzle 24 blowing downwards.

[0037] To optimize the external flow field during transient pressure relief, the external exhaust direction of the pressure relief channel 2321 is set to be opposite to or at an obtuse angle to the downward exhaust direction of the nozzle 24. This effectively guides the released high-pressure cold gas to diffuse upwards or horizontally towards the side of the equipment, preventing lateral chaotic airflow from blowing downwards and interfering with the heat distribution of the molten metal pool in the processing area. Simultaneously, to ensure that the airflow strictly follows the preset pressure relief path, the cross-sectional area of ​​the annular cavity 222 is set to be larger than the inlet cross-sectional area of ​​the inlet pipe 221. Utilizing the principle of volumetric abrupt change, the high-speed incoming gas is decelerated and circumferentially pressure-equalized within the annular cavity 222, ensuring high coaxial stability of the subsequent airflow entering the main air duct. The total exhaust cross-sectional area of ​​the pressure relief channel 2321 is set to be larger than the cross-sectional area of ​​the downward-blowing exhaust orifice of the nozzle 24. Based on the physical principle that fluid preferentially diffuses along the path of least resistance, when the sealing part 2334 disengages, the wider pressure relief channel 2321 instantly empties most of the air pressure in the sliding cavity 23, thus ensuring a sharp drop in airflow at the nozzle 24. Specifically, when the high-speed, high-pressure airflow faces the pressure relief channel 2321 with its rapidly increasing cross-sectional area, according to the diffusion principle of Bernoulli's equation, the fluid's kinetic energy is rapidly converted into static pressure and released outward with sudden diffusion dissipation, causing the residual air pressure in the flow channel of the nozzle 24 directly below to drop below the critical threshold for cold quenching within milliseconds. This passive flow diversion setting based on the overwhelming difference in cross-sectional area ensures that even when the main air source is fully supplied, the processing area will not be disturbed.

[0038] like Figures 3 to 8As shown: The pressure relief channel 2321 includes multiple lateral exhaust channels that are uniformly and symmetrically arranged along the circumference of the housing 22; in the pressure relief state, the airflow is synchronously ejected through the multiple lateral exhaust channels.

[0039] To maintain the dynamic mechanical balance of the machine tool, the pressure relief channel 2321 is further preferably composed of multiple lateral exhaust branches evenly and symmetrically arranged along the circumference of the housing 22. In transient pressure relief, the high-pressure airflow is simultaneously ejected in all directions through the multiple lateral exhaust branches. The thrust vectors generated in each direction cancel each other out, and the vector sum approaches zero, effectively avoiding lateral mechanical disturbances to the suspended cutting head 1 caused by the airflow thrust, thus maintaining the extremely high stability of the cutting optical axis of the equipment. In terms of specific structure, the pressure relief channel 2321 is preferably constructed as an L-shaped or S-shaped tortuous reversing flow channel inside the housing 22. When high-pressure cold gas of more than ten atmospheres is instantaneously released outward through this channel, the airflow will experience a forced change in flow direction and collide with internal shock waves at the bend of the flow channel, thereby significantly dissipating the initial kinetic energy of the airflow. This structural design effectively weakens the high-frequency sonic boom and howling generated when high-pressure gas is instantaneously released into the atmosphere, acting as a built-in physical silencer and improving the acoustic environment of the workshop. At the same time, this maze-like tortuous path also increases the physical resistance to the reverse intrusion of external cutting dust or metal splashes into the airflow distribution mechanism 2, providing a reliable passive protective barrier for the internal precision sliding assembly surfaces.

[0040] like Figure 4 As shown: The device also includes a hardware transient distribution module connected in parallel to the laser generator control bus; the hardware transient distribution module is used to intercept the light-off level signal sent by the CNC system and directly output the trigger voltage to the drive component 234 within a microsecond delay, so as to realize the hardware-level synchronization of optical path cut-off and mechanical pressure relief action.

[0041] At the electromechanical coordination and logic control level, to overcome the instruction delay caused by traditional software communication buses, the device can preferably be configured with a hardware transient distribution module connected in parallel to the laser generator control bus, specifically an independent interception circuit board built based on a field-programmable gate array (FPGA) or a high-speed digital signal processor (DSP). This hardware transient distribution module can directly intercept the light-cutting level signal issued by the CNC system and convert it into a trigger voltage within a microsecond delay, directly outputting it to the drive component 234, thereby achieving tight synchronization between beam cutting and mechanical pressure relief at the underlying physical circuit. In conventional CNC bus communication, due to the existence of the PLC's cyclic scanning cycle, there is usually a delay of tens of milliseconds from issuing the light-cutting command to mechanical execution; when the machine tool is cutting at a high speed of tens of meters per minute, this delay of tens of milliseconds will cause the cutting head 1 to travel a distance of several millimeters, causing the pressure relief action to completely miss the micro-connection point. The hardware transient distribution module of this invention directly intercepts the level pulse at the underlying circuit, compressing the response delay to the sub-millisecond level and eliminating spatial displacement deviation.

[0042] like Figure 1 As shown: The CNC system integrates a constant speed algorithm module; when the cutting head 1 executes the trajectory of the blind hole reserved connection point area and triggers the pressure relief state, the CNC system controls the servo driver of the machine tool host to maintain the current tangent synthesis speed for uniform circular interpolation, and shields deceleration or stop commands.

[0043] By embedding a constant speed algorithm module into the CNC system, when the cutting head 1 executes the trajectory of the blind hole reserved connection point area and triggers the pressure relief state, the CNC system controls the servo driver of the machine tool host to maintain the current tangential synthesis speed for uniform circular interpolation, actively shielding conventional deceleration or stop commands. This method not only effectively reduces mechanical resonance and trajectory deformation caused by frequent emergency braking of the machine tool, but also improves the overall cycle time of blind hole machining.

[0044] like Figure 3 , Figure 4 and Figure 7 As shown: The sliding cavity 23 also integrates a miniature absolute pressure sensor 235.

[0045] The sliding cavity 23 further integrates a miniature absolute pressure sensor 235, such as a piezoresistive MEMS pressure sensor or a miniature capacitive barometer. In actual operation, the miniature absolute pressure sensor 235 can monitor in real time the static pressure drop trough signal that appears inside the sliding cavity 23 due to volume merging at the moment of depressurization. This signal is used by the CNC system for secondary verification of the effectiveness of valve action. Compared with the conventional setting where the sensor is exposed to the external exhaust port and is easily contaminated by environmental turbulence or cutting dust, this solution directly buries the probe end of the absolute pressure sensor inside the sliding cavity 23, which is doubly purified by the protective mirror 21 and the sealed air curtain. This avoids the interference of complex flow field on the exhaust side and can most sensitively capture the original pressure drop signal when the fully enclosed volume is instantly broken, thus improving the signal-to-noise ratio and service life of the closed-loop feedback.

[0046] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A laser cutting device for ensuring the strength of blind hole connections in a power distribution cabinet, comprising a machine tool host, a laser generator, a CNC system, and a cutting head, characterized in that, The cutting head is equipped with a protective mirror inside, and an airflow distribution mechanism is provided between the protective mirror and the nozzle at the bottom. The airflow distribution mechanism includes: The housing has an air inlet pipe on its side wall and an annular cavity inside. The inner wall of the annular cavity has a sliding cavity. The upper end of the sliding cavity has an air inlet, and the lower end has an air outlet and a pressure relief channel connected to the air outlet. The sliding base has a hollow interior to form the main air passage, and is slidably disposed in the sliding cavity and can slide along its axial direction; The bottom of the sliding base has a tapered through-hole that connects to the main internal air passage and matches the nozzle. A driving component, disposed within the sliding cavity, is used to drive the sliding base to perform axial displacement; In the working state, the drive component applies an axial force to seal the mating part of the sliding base with the nozzle, thus sealing the through hole; in the depressurization state, the sliding base is lifted axially, causing the mating part to disengage from the seal, and the through hole connects with the air outlet at the bottom of the sliding cavity, allowing the airflow to be discharged through the depressurization channel.

2. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The outer wall of the sliding base extends circumferentially to form a first force-receiving part and a second force-receiving part; the driving assembly includes a first force-applying member and a second force-applying member, the first force-applying member being sandwiched between the inner top wall of the sliding cavity and the first force-receiving part, and the second force-applying member being sandwiched between the inner bottom wall of the sliding cavity and the second force-receiving part.

3. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 2, characterized in that, The first force-applying component is a first piezoelectric ceramic, and the second force-applying component is an elastic reset component.

4. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 2, characterized in that, The first force-applying component is a second piezoelectric ceramic, and the second force-applying component is a third piezoelectric ceramic; the numerical control system alternately controls the expansion and contraction of the second and third piezoelectric ceramics by outputting differential level signals.

5. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The external exhaust direction of the pressure relief channel is opposite to or at an obtuse angle to the downward exhaust direction of the nozzle, so as to prevent the pressure relief airflow from interfering with the processing area downward.

6. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The cross-sectional area of ​​the annular cavity is larger than the air intake cross-sectional area of ​​the air intake pipe, and the total exhaust cross-sectional area of ​​the pressure relief channel is larger than the cross-sectional area of ​​the air outlet hole of the nozzle blowing downwards.

7. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The pressure relief channel includes multiple lateral exhaust channels that are uniformly and symmetrically arranged along the circumference of the housing; in the pressure relief state, the airflow is synchronously ejected through the multiple lateral exhaust channels.

8. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The device also includes a hardware transient distribution module connected in parallel to the laser generator control bus; the hardware transient distribution module is used to intercept the light-off level signal sent by the CNC system and directly output a trigger voltage to the drive component within a microsecond delay, so as to realize hardware-level synchronization of optical path cutoff and mechanical pressure relief action.

9. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The CNC system integrates a constant speed algorithm module; when the cutting head executes the trajectory of the blind hole reserved connection point area and triggers the pressure relief state, the CNC system controls the servo driver of the machine tool host to maintain the current tangent synthesis speed for uniform circular interpolation, and shields deceleration or stop commands.

10. The laser cutting equipment for ensuring the strength of blind hole connections in a power distribution cabinet according to claim 1, characterized in that, The sliding cavity also integrates a miniature absolute pressure sensor.

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