Laser cutting device for liquid crystal display (LCD) screen

Abstract

The invention belongs to the technical field of laser cutting, and particularly relates to an LCD (liquid crystal display) laser cutting device which comprises a base, a rack, a vacuum clamp and a laser generator, the rack is fixedly arranged at the top of the base, an air cylinder is fixedly arranged at the top of the rack, a movable cover is fixedly arranged at the movable end of the air cylinder, and the vacuum clamp is arranged on the movable cover. A moving assembly is arranged in the moving cover, the laser generator is arranged at the bottom of the moving assembly, and the vacuum clamp is fixedly arranged on the top of the base. Through cooperation of the auxiliary nitrogen blowing-out mechanism and the gas suction temperature detection mechanism, accurate regulation and control of the nitrogen flow are achieved, and the product yield is increased; meanwhile, a smoke filtering mechanism is combined with stepped intelligent regulation and control, so that smoke is efficiently purified, and the safety of an operation environment is guaranteed; in addition, the nitrogen blowing-out mechanism and the gas suction temperature detection mechanism are assisted to rotate, the gas blowing and suction effects are optimized, and the cutting quality and efficiency are improved in all directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser cutting, and particularly relates to a laser cutting device for LCD liquid crystal display screens. Background Art

[0002] With the wide application of LCD liquid crystal display screens in the field of electronic devices, the requirements for the refinement of their manufacturing processes are continuously increasing. Laser cutting technology, with its advantages such as high precision and non-contact, has become one of the key technologies for the cutting and processing of LCD liquid crystal display screens. Therefore, laser cutting devices are also widely used. For example, the publication number: CN118060742A, discloses a laser cutting device for LCD liquid crystal display screens.

[0003] Currently, to improve the cutting quality, nitrogen is generally used as the auxiliary gas in the industry. Utilizing its inert gas characteristics to inhibit oxidation and reduce slag residue. However, there are differences in the structure and material of different regions of the LCD liquid crystal display screen, resulting in uneven temperature distribution during the laser cutting process. The traditional cutting device lacks a real-time monitoring and precise control mechanism for temperature changes, and it is difficult to dynamically match the nitrogen supply. Excessive nitrogen will cause local rapid cooling in the cutting area, generating thermal stress, leading to glass fragmentation or damage to the liquid crystal layer. Insufficient nitrogen cannot effectively inhibit oxidation, resulting in rough cutting edges and burrs, seriously affecting the product yield; in addition, the spraying direction of the auxiliary gas of the conventional laser cutting device is fixed and single, making it difficult to fully cover the cutting area with complex shapes. The gas cannot fully act on the cutting front, and it is impossible to timely discharge the molten material and heat, resulting in low cutting efficiency and unstable quality.

[0004] Therefore, a laser cutting device for LCD liquid crystal display screens is proposed. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems and provide a laser cutting device for LCD liquid crystal display screens.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A laser cutting device for LCD liquid crystal display screens, including a base, a frame, a vacuum fixture, and a laser generator. The frame is fixedly arranged on the top of the base. A cylinder is fixedly provided on the top of the frame. The moving end of the cylinder is fixedly provided with a moving cover. A moving component is arranged inside the moving cover. The laser generator is arranged at the bottom of the moving component. The vacuum fixture is fixedly arranged on the top of the base, and further includes: A rotating mechanism, arranged on the outer wall of the laser generator, and the rotating mechanism can rotate forward and backward; An auxiliary nitrogen blowing mechanism, arranged at the bottom of the rotating mechanism, and the auxiliary nitrogen blowing mechanism is located on one side of the laser generator; The gas inhalation temperature detection mechanism is arranged at the bottom of the rotation mechanism, and the gas inhalation temperature detection mechanism is located on the other side of the laser generator; The smoke filtering mechanism is arranged inside the gas inhalation temperature detection mechanism; The cleaning mechanism is arranged on the outer wall of the lower end of the laser generator, and the cleaning mechanism is used to clean the detection components of the gas inhalation temperature detection mechanism; The PLC controller is arranged on the side wall of the frame, and the vacuum fixture, laser generator, cylinder, rotation mechanism, auxiliary nitrogen blowing mechanism and smoke filtering mechanism are all electrically connected to the PLC controller.

[0007] Preferably, the rotation mechanism includes a fixed cover fixedly arranged on the outer wall of the laser generator. A large gear is arranged inside the fixed cover, and the inner wall of the large gear is rotationally connected to the outer wall of the laser generator through a bearing. A motor is fixedly arranged on the inner wall of the top of the fixed cover, and a small gear is fixedly arranged on the output shaft of the motor. The small gear is meshed with the large gear.

[0008] Preferably, an infrared emitter is fixedly arranged on one side of the upper surface of the large gear, and an infrared receiver is fixedly arranged on one side inner wall of the fixed cover, and the infrared receiver is arranged corresponding to the position of the infrared emitter.

[0009] Preferably, the auxiliary nitrogen blowing mechanism includes a fixed rod fixedly arranged on one side of the lower surface of the large gear. A nitrogen blowing pipe is obliquely fixedly arranged at the lower end of the fixed rod. A first solenoid valve is fixedly arranged on the pipe wall of the nitrogen blowing pipe, and one end of the nitrogen blowing pipe is connected to an external nitrogen storage device through a conduit.

[0010] Preferably, the gas inhalation temperature detection mechanism includes a box body fixedly arranged on the other side of the lower surface of the large gear. A gas inhalation pipe is fixedly arranged at the bottom of the box body. An air suction fan is fixedly arranged on the side wall of the box body. The gas inhalation pipe is a bent pipe, and a temperature sensor is detachably arranged at the lower end of the gas inhalation pipe.

[0011] Preferably, an installation sleeve is arranged at the opening of the gas inhalation pipe. Connecting rods are fixedly arranged between both sides of the installation sleeve and the inner wall of the lower end of the gas inhalation pipe. The temperature sensor is threadedly connected to the installation sleeve, and the detection end of the temperature sensor extends to the outside of the gas inhalation pipe.

[0012] Preferably, the smoke filtering mechanism includes an activated carbon filter screen fixedly arranged inside the box body. The upper end of the gas inhalation pipe extends into the box body and is fixedly provided with a plurality of branch pipes. The plurality of branch pipes are all distributed towards one side of the activated carbon filter screen, and second solenoid valves are arranged on the pipe walls of the plurality of branch pipes.

[0013] Preferably, the cleaning mechanism includes a fixing ring sleeved on the outer wall of the lower end of the laser generator. A bolt is provided on the side wall of the fixing ring and is threadedly connected to the side wall of the laser generator. A high-temperature resistant sponge brush is obliquely and fixedly provided on the side wall of the fixing ring, and the high-temperature resistant sponge brush can be arranged in contact with the detection end of the temperature sensor.

[0014] Compared with the existing technology, the beneficial effects of the present invention are as follows: 1. Through the provided auxiliary nitrogen blowing mechanism and gas inhalation temperature detection mechanism, with the cooperation of the nitrogen blowing pipe and the gas inhalation pipe, the nitrogen blowing pipe blows nitrogen towards the cutting area, improving the cutting quality. At the same time, the gas inhalation pipe can inhale the gas in the cutting area, enabling the gas to pass through the temperature sensor to monitor the temperature of the cutting area in real time and transmit the data to the PLC controller. According to the temperature change, the opening degree of the first solenoid valve core is accurately adjusted to achieve dynamic and refined control of the nitrogen flow rate, effectively avoiding thermal stress damage caused by excessive nitrogen and problems such as rough cutting edges and burrs caused by insufficient nitrogen, and greatly improving the product yield.

[0015] 2. Through the provided smoke filtering mechanism, using the physical adsorption and chemical adsorption principles of the activated carbon filter screen, the smoke generated during cutting is effectively purified. At the same time, through the stepped intelligent control strategy constructed by the PLC controller, the number of branch pipes is dynamically adjusted according to the temperature change, combined with the adjustment of the suction fan speed, to achieve efficient interception and purification of high-concentration smoke and ensure the safety of the cutting operation environment.

[0016] 3. Through the provided rotating mechanism, it can drive the auxiliary nitrogen blowing mechanism and the gas inhalation temperature detection mechanism to rotate synchronously. Rotating and blowing enables nitrogen to evenly and comprehensively cover the cutting area, inhibiting the oxidation reaction, taking away the slag and heat, and ensuring the quality of the cutting surface; rotating and inhaling expands the smoke capture range, improves the accuracy of temperature detection, and ensures the stable and efficient gas inhalation process; at the same time, as the gas inhalation temperature detection mechanism rotates, the activated carbon filter screen will generate a centrifugal motion, which can accelerate the contact speed and frequency between the smoke and the activated carbon, and improve the adsorption efficiency of harmful substances in the smoke; 4. Through the provided smoke filtering mechanism, during the rotation of the gas inhalation temperature detection mechanism, the temperature sensor dynamically contacts the high-temperature resistant sponge brush of the smoke filtering mechanism, automatically wiping the detection end to remove the attached impurities, avoiding impurity interference with the temperature signal acquisition, and ensuring that the temperature sensor always maintains high-precision detection performance, providing a reliable basis for the precise control of the cutting process. Description of the Drawings

[0017] Figure 1 is a perspective view of an LCD liquid crystal display laser cutting device provided by the present invention in an inclined top view; Figure 2 It is a stereoscopic diagram of an LCD liquid crystal display screen laser cutting device provided by the present invention, viewed from an oblique angle; Figure 3 It is a three-dimensional diagram of components surrounding a laser generator of an LCD liquid crystal display screen laser cutting device provided by the present invention; Figure 4 It is a cutaway perspective view of a rotating mechanism of a laser cutting device for an LCD liquid crystal display screen provided by the present invention; Figure 5 It is a stereoscopic diagram of a gas inhalation temperature detection mechanism and a smoke filtering mechanism of an LCD liquid crystal display screen laser cutting device provided by the present invention; Figure 6 It is a partial stereoscopic diagram of the end of a gas suction pipe of a laser cutting device for an LCD liquid crystal display screen provided by the present invention; Figure 7 The present invention provides a three-dimensional diagram of a cleaning mechanism of a laser cutting device for an LCD display screen.

[0018] In the figure: 1 base, 2 frame, 3 vacuum fixture, 4 laser generator, 5 cylinder, 6 moving cover, 7 moving assembly, 8 rotating mechanism, 81 fixed cover, 82 large gear, 83 motor, 84 small gear, 85 infrared transmitter, 86 infrared receiver, 9 auxiliary nitrogen blowing mechanism, 91 fixed rod, 92 nitrogen blowing pipe, 93 first solenoid valve, 10 gas suction temperature detection mechanism, 101 box body, 102 gas suction pipe, 103 suction fan, 104 temperature sensor, 105 installation sleeve, 106 connecting rod, 11 smoke filtering mechanism, 111 activated carbon filter, 112 branch pipe, 113 second solenoid valve, 12 cleaning mechanism, 121 fixed ring, 122 bolt, 123 high temperature resistant sponge brush, 13 PLC controller. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figures 1 - 7As shown in the figure, a laser cutting device for an LCD liquid crystal display screen includes a base 1, a frame 2, a vacuum fixture 3, and a laser generator 4. The frame 2 is fixedly arranged on the top of the base 1. A cylinder 5 is fixedly arranged on the top of the frame 2. The moving end of the cylinder 5 is fixedly provided with a moving cover 6. A moving component 7 is arranged inside the moving cover 6. The laser generator 4 is arranged at the bottom of the moving component 7. The moving component 7 adopts an electric slider type component, and the moving component 7 includes electric slider structures in the X-axis and Y-axis directions, capable of adjusting the position of the laser generator 4 in the X-axis and Y-axis directions. Then, in cooperation with the cylinder 5 to adjust the position of the laser generator 4 in the Z-axis, the vacuum fixture 3 is fixedly arranged on the top of the base 1. It also includes: A rotating mechanism 8 is arranged on the outer wall of the laser generator 4, and the rotating mechanism 8 can rotate forward and backward. The rotating mechanism 8 includes a fixed cover 81 fixedly arranged on the outer wall of the laser generator 4. A large gear 82 is arranged inside the fixed cover 81, and the inner wall of the large gear 82 is rotationally connected to the outer wall of the laser generator 4 through a bearing. A motor 83 is fixedly arranged on the inner wall of the top of the fixed cover 81. The output shaft of the motor 83 is fixedly provided with a small gear 84. The small gear 84 is meshed with the large gear 82. When the motor 83 operates, it can drive the small gear 84 to rotate, and the small gear 84 further drives the large gear 82 to rotate, so that the auxiliary nitrogen blowing mechanism 9 and the gas inhalation temperature detection mechanism 10 installed on both sides of the surface of the large gear 82 rotate synchronously. On one side of the upper surface of the large gear 82, an infrared emitter 85 is fixedly arranged. On one side of the inner wall of the fixed cover 81, an infrared receiver 86 is fixedly arranged, and the infrared receiver 86 is arranged corresponding to the position of the infrared emitter 85. During the rotation of the large gear 82, the infrared emitter 85 rotates synchronously. When the infrared emitter 85 rotates to align with the infrared receiver 86 on the side wall of the fixed cover 81, the light beam emitted by the infrared emitter 85 is exactly received by the infrared receiver 86, and the motor 83 is controlled to rotate in the reverse direction.

[0021] The auxiliary nitrogen blowing mechanism 9 is arranged at the bottom of the rotating mechanism 8, and the auxiliary nitrogen blowing mechanism 9 is located on one side of the laser generator 4. The auxiliary nitrogen blowing mechanism 9 includes a fixed rod 91 fixedly arranged on one side of the lower surface of the large gear 82. The lower end of the fixed rod 91 is obliquely fixedly provided with a nitrogen blowing pipe 92. A first solenoid valve 93 is fixedly arranged on the pipe wall of the nitrogen blowing pipe 92, and one end of the nitrogen blowing pipe 92 is connected to an external nitrogen storage device through a conduit. When the external nitrogen storage device is started, nitrogen is transported from the storage device to the nitrogen blowing pipe 92 and precisely sprayed onto the cutting area of the LCD liquid crystal display screen to improve the cutting quality.

[0022] The gas inhalation temperature detection mechanism 10 is arranged at the bottom of the rotating mechanism 8, and the gas inhalation temperature detection mechanism 10 is located on the other side of the laser generator 4. The gas inhalation temperature detection mechanism 10 includes a box body 101 fixedly arranged on the other side of the lower surface of the large gear 82. A gas inhalation pipe 102 is fixedly arranged at the bottom of the box body 101. An air suction fan 103 is fixedly arranged on the side wall of the box body 101. The gas inhalation pipe 102 is a bent pipe, and a temperature sensor 104 is detachably arranged at the lower end of the gas inhalation pipe 102. The bent pipe enables the temperature sensor 104 to be aligned with the cutting area. An installation sleeve 105 is arranged at the opening of the gas inhalation pipe 102. Connecting rods 106 are fixedly arranged between both sides of the installation sleeve 105 and the inner wall of the lower end of the gas inhalation pipe 102. The temperature sensor 104 is threadedly connected with the installation sleeve 105, and the detection end of the temperature sensor 104 extends to the outside of the gas inhalation pipe 102. The installation of this structure not only ensures that the temperature sensor 104 can detect the temperature of the gas, but also ensures that the gas can smoothly pass through the inside of the gas inhalation pipe 102. When it is necessary to disassemble and maintain the temperature sensor 104, the staff rotates the temperature sensor 104 by hand to disassemble and remove the temperature sensor 104 from the inside of the installation sleeve 105.

[0023] The smoke filtering mechanism 11 is arranged inside the gas inhalation temperature detection mechanism 10. The smoke filtering mechanism 11 includes an activated carbon filter screen 111 fixedly arranged inside the box body 101. The upper end of the gas inhalation pipe 102 extends into the box body 101 and is fixedly provided with a plurality of branch pipes 112. The plurality of branch pipes 112 are all distributed towards one side of the activated carbon filter screen 111, and second electromagnetic valves 113 are arranged on the pipe walls of the plurality of branch pipes 112. When the gas flows through the activated carbon filter screen 111 arranged inside the box body 101, the activated carbon realizes purification by virtue of its unique physical adsorption and chemical adsorption principles. Since the smoke concentration generated by cutting is positively correlated with the temperature of the cutting area, the higher the temperature, the more smoke generated by the gasification and decomposition of the material. Based on this, a stepped intelligent regulation strategy is constructed to adjust the number of branch pipes 112 used.

[0024] The cleaning mechanism 12 is arranged on the outer wall of the lower end of the laser generator 4, and the cleaning mechanism 12 is used to clean the detection component of the gas intake temperature detection mechanism 10. The cleaning mechanism 12 includes a fixing ring 121 sleeved on the outer wall of the lower end of the laser generator 4. A bolt 122 threadedly connected to the side wall of the laser generator 4 is provided on the side wall of the fixing ring 121. A high-temperature resistant sponge brush 123 is obliquely and fixedly arranged on the side wall of the fixing ring 121, and the high-temperature resistant sponge brush 123 can be in contact with the detection end of the temperature sensor 104. During the rotation of the gas intake temperature detection mechanism 10, the temperature sensor 104 will form a dynamic contact with the high-temperature resistant sponge brush 123. With its soft and high-temperature resistant characteristics, the high-temperature resistant sponge brush 123 automatically wipes the detection end, timely removing attached pollutants such as soot and debris, avoiding impurity interference with temperature signal acquisition, and ensuring that the temperature sensor 104 always maintains high-precision detection performance. The high-temperature resistant sponge brush 123 will not be affected by high-temperature gas and maintains the wiping effect on the temperature sensor 104. When the high-temperature resistant sponge brush 123 needs to be replaced, the bolt 122 is loosened with a wrench, and the fixing ring 121 can be disassembled from the outer wall of the laser generator 4.

[0025] The PLC controller 13 is arranged on the side wall of the frame 2. The vacuum fixture 3, the laser generator 4, the cylinder 5, the rotating mechanism 8, the auxiliary nitrogen blowing mechanism 9, and the smoke filtering mechanism 11 are all electrically connected to the PLC controller 13.

[0026] Now, the operating principle of the present invention is described as follows: The staff first turns on the power of the cutting device, cleans the surface of the vacuum fixture 3, and then places the LCD liquid crystal display to be cut on the top of the vacuum fixture 3. The vacuum pump is started through the PLC controller 13, and precise positioning is achieved by vacuum adsorption. Subsequently, the PLC controller 13 is manually operated to synchronously start the cylinder 5 and the moving component 7. The cylinder 5 drives the fixed cover 81 to move downward along the Z-axis direction, causing the laser generator 4 to move vertically. The moving component 7 drives the laser generator 4 to flexibly move in the X-axis and Y-axis directions until the laser generator 4 is aligned with the cutting area of the LCD liquid crystal display. Finally, the laser generator 4 is started through the PLC controller 13, and with the coordinated cooperation of the moving component 7, the efficient cutting operation of the LCD liquid crystal display is completed. The laser generator 4 acts on the LCD liquid crystal display with a laser beam of high energy density, causing the material to quickly melt; During the laser cutting operation, the staff starts the external nitrogen storage device and the suction fan 103 synchronously through the PLC controller 13. The nitrogen is transported to the nitrogen blowing pipe 92 through the storage device and accurately sprayed to the cutting area of ​​the LCD liquid crystal display screen. On the one hand, nitrogen, as an inert gas, can effectively isolate oxygen, inhibit high-temperature oxidation of materials, and avoid defects such as ablation and discoloration on the cutting surface. On the other hand, the high-speed nitrogen flow can blow away the slag and debris generated by the cutting in time, so that the slag and debris are blown to one side of the cutting area, ensuring that the incision is smooth and flat, and taking away the heat in the cutting area, preventing local overheating from causing material deformation or liquid crystal layer damage; At the same time, the suction fan 103 keeps running, so that the interior of the box body 101 and the interior of the gas suction pipe 102 are in a negative pressure state. Since the gas suction pipe 102 and the nitrogen blow-out pipe 92 are arranged opposite to each other, the nitrogen blow-out pipe 92 blows the heat of the cutting area to the gas suction pipe 102. At the same time, the gas suction pipe 102 absorbs the heat generated by the cutting, so that the gas passes through the temperature sensor 104 built in the gas suction pipe 102. When the gas flows through the temperature sensor 104, its detection end monitors the gas temperature in real time. The temperature sensor 104 transmits data to the PLC controller 13 in the form of an electrical signal. The PLC controller 13 accurately adjusts the opening and closing degree of the valve core of the first solenoid valve 93 according to the temperature change. When the temperature in the cutting area rises, the valve core opening of the first solenoid valve 93 is automatically increased, and the nitrogen supply is increased to enhance the cooling and slag removal effect, so as to avoid the phenomenon of rough cutting edges and burrs. When the temperature in the cutting area decreases, the valve core opening of the first solenoid valve 93 is reduced to avoid excessive waste of nitrogen and material damage caused by sudden cooling, thereby realizing dynamic and refined control of nitrogen flow. The cutting waste gas sucked into the box body 101 contains smoke particles and volatile harmful gases. When the gas flows through the built-in activated carbon filter 111, the activated carbon achieves purification by virtue of its unique physical adsorption and chemical adsorption principles. The activated carbon has a rich microporous structure inside, and can adsorb organic molecules and odor substances in the smoke on the pore surface through the intermolecular force disk (van der Waals force). At the same time, the functional groups on the surface of the activated carbon can react chemically with the harmful gases to further enhance the adsorption effect, thereby effectively filtering the smoke components. The filtered clean gas is discharged into the air through the suction fan 103 to avoid polluting the processing environment. Since the smoke concentration generated by cutting is positively correlated with the temperature of the cutting area, the higher the temperature, the more smoke is generated by the gasification and decomposition of the material. Based on this, the PLC controller 13 constructs a stepped intelligent regulation strategy. When the temperature sensor 104 detects that the temperature of the cutting area is between 30-50°C, the system defaults to enabling a single branch pipe 112, and the PLC controller 13 only turns on one second solenoid valve 113 to ensure the basic filtration efficiency. When the temperature rises to 50-70°C, the PLC controller 13 automatically activates two second solenoid valves 113, activating two branch pipes 112 to split the smoke gas and double-expand the contact area of the activated carbon filter net 111. If the temperature exceeds 70°C, the PLC controller 13 will turn on all three second solenoid valves 113, and the three branch pipes 112 will work synchronously to maximize the filtration area and purification efficiency. By dynamically adjusting the number of branch pipes 112 and simultaneously increasing the rotation speed of the suction fan 103 (for every 10°C increase in temperature, the current of the suction fan 103 increases by 20%), efficient interception and purification of high-concentration smoke are achieved, ensuring the safety of the cutting operation environment; To improve the cutting quality of the LCD liquid crystal display screen, during the cutting operation, the operator manually operates the PLC controller 13 to start the motor 83. The rotation of the motor 83 drives the small gear 84 to rotate, and the small gear 84 further drives the large gear 82 to rotate, causing the auxiliary nitrogen blowing mechanism 9 and the gas inhalation temperature detection mechanism 10 installed on both sides of the surface of the large gear 82 to rotate synchronously. At this time, the nitrogen blowing pipe 92 blows air in a rotating manner, and the gas inhalation pipe 102 inhales air in a rotating manner. The rotating nitrogen blowing pipe 92 can evenly and comprehensively cover the cutting area with nitrogen, avoiding local under-protection or over-protection. Regardless of how complex and variable the cutting path is, the rotating nitrogen can effectively inhibit the oxidation reaction during cutting in a timely manner, ensuring a smooth and flat cutting surface, reducing the generation of defects. At the same time, the rotating airflow can more efficiently carry away the slag and heat generated by cutting, preventing the slag from adhering and affecting the cutting effect, reducing the temperature of the cutting area, and avoiding material deformation due to overheating. The rotating gas inhalation pipe 102 greatly expands the capture range of the smoke, waste gas, etc. generated by cutting, and can quickly and comprehensively inhale them. This not only prevents the smoke from spreading in the working area and improves the working environment, but also enables the gas inhalation temperature detection mechanism 10 to more accurately obtain the gas temperature in the cutting area, providing reliable data for subsequent precise regulation. In addition, rotating inhalation can prevent uneven gas flow caused by local suction unevenness, ensuring a stable and efficient entire inhalation process; Meanwhile, as the gas inhalation temperature detection mechanism 10 rotates, the activated carbon filter net 111 inside the box body 101 will generate centrifugal motion. This motion can accelerate the contact speed and frequency between the smoke and the activated carbon, improve the adsorption efficiency of harmful substances in the smoke, and make the filtering effect more excellent. Moreover, the centrifugal force can throw off and collect some impurities adsorbed on the activated carbon filter net 111 at the bottom of the box body 101, playing a role of self-cleaning, delaying the blockage of the filter net, and ensuring the continuous and stable filtering performance. After the processing is completed, the activated carbon filter net 111 can be disassembled and taken out from the bottom of the box body 101. Not only can a new activated carbon filter net 111 be replaced, but also the impurities at the bottom of the box body 101 can be cleaned; During the rotation of the large gear 82, the infrared emitter 85 installed on its upper surface rotates synchronously. When the infrared emitter 85 rotates to align with the infrared receiver 86 on the side wall of the fixed cover 81, the light beam emitted by the infrared emitter 85 is exactly received by the infrared receiver 86. At this time, the infrared receiver 86 quickly feeds back an electrical signal to the PLC controller 13 (the infrared emitter 85 is based on the photoelectric effect of semiconductor materials. After being powered on, it excites the internal light-emitting element to generate an infrared light beam with a specific wavelength and emits it directionally. The infrared receiver 86 uses a photodiode or a phototransistor as the core element. When the infrared light beam emitted by the infrared emitter 85 irradiates the receiver, the photoelectric element absorbs the photon energy, causing the generation of electron-hole pairs, thereby generating a change in the electrical signal. After being amplified, filtered and other processed by the internal circuit, the optical signal is converted into an electrical signal that can be recognized by the PLC controller 13 and fed back). After receiving this electrical signal, the PLC controller 13 immediately controls the motor 83 to rotate in the reverse direction. In this way, the auxiliary nitrogen blowing mechanism 9 and the gas inhalation temperature detection mechanism 10 will rotate in the reverse direction after each full rotation, avoiding the problem of wire entanglement of the wires connected to each mechanism and ensuring the continuous and stable operation of the equipment; During the cutting process, when the smoke gas flows through the surface of the temperature sensor 104, it is very easy for impurities to adhere to the detection end, resulting in a decrease in detection accuracy. To solve this problem, during the rotation of the gas inhalation temperature detection mechanism 10, the temperature sensor 104 will form dynamic contact with the high-temperature resistant sponge brush 123 fixed on the side wall of the laser generator 4. When the temperature sensor 104 rotates past the sponge brush along with the mechanism, the high-temperature resistant sponge brush 123 automatically wipes the detection end with its soft and high-temperature resistant characteristics, timely removing pollutants such as soot and debris attached, avoiding impurity interference with temperature signal acquisition, ensuring that the temperature sensor 104 always maintains high-precision detection performance, providing accurate temperature data for the PLC controller 13, and thus realizing precise control of the cutting process; After the cutting process is completed, the operator issues an instruction by operating the PLC controller 13 to precisely control the laser generator 4 to reset to the initial position along the X, Y, and Z axes. Subsequently, the power supply of the equipment is disconnected. After the equipment has completely stopped, the adsorption state of the vacuum fixture 3 is released, and the completed LCD liquid crystal display screen is carefully removed. Immediately afterwards, a special tool is used to carefully clean the residual edge materials, slag, and debris on the surface of the vacuum fixture 3 to ensure that the surface of the fixture is clean, preparing for the next cutting operation and effectively avoiding the influence of residual impurities on the adsorption and positioning accuracy of subsequent workpieces and the cutting quality.

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A laser cutting device for an LCD display screen, comprising a base (1), a frame (2), a vacuum fixture (3) and a laser generator (4), wherein the frame (2) is fixedly arranged on the top of the base (1), a cylinder (5) is fixedly arranged on the top of the frame (2), a moving cover (6) is fixedly arranged on the moving end of the cylinder (5), a moving component (7) is arranged inside the moving cover (6), the laser generator (4) is arranged at the bottom of the moving component (7), and the vacuum fixture (3) is fixedly arranged on the top of the base (1), characterized in that: Also includes: A rotating mechanism (8) is arranged on the outer wall of the laser generator (4), and the rotating mechanism (8) is capable of forward and reverse rotation; An auxiliary nitrogen blowing mechanism (9) is arranged at the bottom of the rotating mechanism (8), and the auxiliary nitrogen blowing mechanism (9) is located on one side of the laser generator (4); A gas intake temperature detection mechanism (10) is arranged at the bottom of the rotating mechanism (8), and the gas intake temperature detection mechanism (10) is located on the other side of the laser generator (4); A smoke filtering mechanism (11) is arranged inside the gas inhalation temperature detection mechanism (10); A cleaning mechanism (12) is arranged on the outer wall of the lower end of the laser generator (4), and the cleaning mechanism (12) is used to clean the detection components of the gas intake temperature detection mechanism (10); A PLC controller (13) is arranged on a side wall of the frame (2); the vacuum clamp (3), the laser generator (4), the cylinder (5), the rotating mechanism (8), the auxiliary nitrogen blowing mechanism (9) and the smoke filtering mechanism (11) are all electrically connected to the PLC controller (13).

2. The LCD display screen laser cutting device according to claim 1, characterized in that: The rotating mechanism (8) comprises a fixed cover (81) fixedly arranged on the outer wall of the laser generator (4), a large gear (82) being arranged inside the fixed cover (81), and the inner wall of the large gear (82) being rotatably connected to the outer wall of the laser generator (4) via a bearing, a motor (83) being fixedly arranged on the top inner wall of the fixed cover (81), a small gear (84) being fixedly arranged on the output shaft of the motor (83), and the small gear (84) being arranged in meshing engagement with the large gear (82).

3. The LCD display screen laser cutting device according to claim 2, characterized in that: An infrared transmitter (85) is fixedly provided on one side of the upper surface of the large gear (82), and an infrared receiver (86) is fixedly provided on one inner wall of the fixed cover (81), and the infrared receiver (86) and the infrared transmitter (85) are arranged in a corresponding position.

4. The LCD display screen laser cutting device according to claim 2, characterized in that: The auxiliary nitrogen blowing mechanism (9) comprises a fixed rod (91) fixedly arranged on one side of the lower surface of the large gear (82), a nitrogen blowing pipe (92) being fixedly arranged at an angle at the lower end of the fixed rod (91), a first solenoid valve (93) being fixedly arranged on the pipe wall of the nitrogen blowing pipe (92), and one end of the nitrogen blowing pipe (92) being connected to an external nitrogen storage device via a conduit.

5. The LCD display screen laser cutting device according to claim 2, characterized in that: The gas intake temperature detection mechanism (10) comprises a box body (101) fixedly arranged on the other side of the lower surface of the large gear (82), a gas intake pipe (102) being fixedly arranged at the bottom of the box body (101), a suction fan (103) being fixedly arranged on the side wall of the box body (101), the gas intake pipe (102) being a bent pipe, and a temperature sensor (104) being detachably arranged at the lower end of the gas intake pipe (102).

6. The LCD display screen laser cutting device according to claim 5, characterized in that: A mounting sleeve (105) is provided at the opening of the gas suction pipe (102), connecting rods (106) are fixedly provided between the two sides of the mounting sleeve (105) and the inner wall of the lower end of the gas suction pipe (102), the temperature sensor (104) is threadedly connected to the mounting sleeve (105), and the detection end of the temperature sensor (104) extends to the outside of the gas suction pipe (102).

7. The LCD display screen laser cutting device according to claim 5, characterized in that: The smoke filtering mechanism (11) comprises an activated carbon filter (111) fixedly arranged inside the box body (101); the upper end of the gas suction pipe (102) extends into the inside of the box body (101) and is fixedly provided with a plurality of branch pipes (112); the plurality of branch pipes (112) are all distributed and arranged toward one side of the activated carbon filter (111); and the pipe walls of the plurality of branch pipes (112) are all provided with a second solenoid valve (113).

8. The LCD display screen laser cutting device according to claim 5, characterized in that: The cleaning mechanism (12) comprises a fixing ring (121) sleeved on the outer wall of the lower end of the laser generator (4); a bolt (122) threadedly connected to the side wall of the laser generator (4) is provided on the side wall of the fixing ring (121); a high temperature resistant sponge brush (123) is obliquely fixedly provided on the side wall of the fixing ring (121); and the high temperature resistant sponge brush (123) can be arranged in contact with the detection end of the temperature sensor (104).

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