A laser marking machine and method based on a heat exchanger production

Abstract

This invention relates to the field of laser marking technology, specifically disclosing a laser marking machine based on a heat exchanger. The machine includes a support base, a placement box fixed to the top of the support base, and a marking component disposed inside the placement box. The marking component emits a laser to mark the heat exchange tubes of the heat exchanger. A placement rack for holding the heat exchange tubes is disposed on the top of the support base. The laser marking machine further includes a jetting component that ejects a low-temperature inert gas. The jetting component includes an outer frame disposed outside the blocking frame, a moving tube fixedly inserted inside a first piston plate, and branch pipes. This combination of structures reduces the possibility of deformation or micro-cracks in thin-walled heat exchange tubes caused by localized thermal expansion, improving product quality. Furthermore, the introduction of inert gas reduces copper oxidation due to high temperatures, preventing oxide layer peeling and ensuring effective marking.

Description

Technical Field

[0001] This invention relates to the field of laser marking technology, and in particular to a laser marking machine and method based on heat exchanger production. Background Technology

[0002] A laser marking machine is a device that uses laser technology to permanently mark the surface of materials. Its core principle is that a high-energy-density laser beam interacts with the material, causing physical or chemical changes in the material to form text, patterns, or logos.

[0003] The heat exchange tubes of a heat exchanger are an important component of the heat exchanger. To ensure heat exchange efficiency, they are usually made of copper. For some heat exchangers that need to be exported, some countries' regulations require permanent marking. Therefore, it is necessary to use a laser marking machine to mark the heat exchange tubes with lasers. The laser marking machine emits a laser, which gives the surface of the heat exchange tubes intelligent heat treatment, leaving a permanent mark on the surface of the heat exchange tubes.

[0004] The "laser marking machine" with authorization announcement number "CN111958121B" can automatically load and unload products by using an automated mechanical adsorption device, thereby improving the automation level and efficiency of the laser marking machine. However, in the actual marking process, the high thermal conductivity of copper causes rapid heat dissipation, and local thermal expansion may cause deformation or micro-cracks in thin-walled copper tubes, which can easily affect the quality of heat exchanger production. At the same time, copper forms copper oxide or cuprous oxide at high temperatures, but the oxide layer is easily affected by environmental humidity and temperature, causing it to fade or peel off, resulting in blurred markings and affecting the marking effect. Summary of the Invention

[0005] The purpose of this invention is to provide a laser marking machine and method based on heat exchanger production, which can reduce the deformation or micro-cracks of thin-walled heat exchange tubes that may be caused by local thermal expansion, thereby improving product quality. On the other hand, by introducing inert gas, the oxidation of copper due to high temperature is reduced, and the oxide layer is prevented from falling off, thus affecting the marking effect, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a laser marking machine based on heat exchanger production, comprising a support base, a placement box fixed to the top of the support base, a marking component disposed inside the placement box on the top of the support base, the marking component emitting a laser to mark the heat exchange tubes of the heat exchanger, and a placement rack for placing the heat exchange tubes disposed on the top of the support base, characterized in that the laser marking machine further comprises:

[0007] A limiting component is disposed on the left side of the placement frame. The limiting component is used to limit the heat exchange tube in conjunction with the placement frame to prevent the heat exchange tube from shifting during marking. The limiting component includes a straight tube fixedly connected to the left side of the placement frame, a cylinder fixedly connected to the right side of the straight tube, a first piston plate fixedly connected inside the cylinder, a blocking frame fixedly connected to the right side of the first piston plate, a small ring fixedly connected inside the straight tube, and a first spring fixedly connected between the small ring and the first piston plate.

[0008] The jet assembly is disposed outside the stop frame and is used to eject low-temperature inert gas. The jet assembly includes an outer frame disposed outside the stop frame, a motion tube fixedly inserted inside the first piston plate, and a branch tube, the branch ends of which are respectively inserted into the motion tube and the outer frame.

[0009] Preferably, the motion tube passes through the inside of the first spring, and the branch tube is made of a flexible material.

[0010] Preferably, the laser marking machine further includes:

[0011] The propulsion assembly is located on the left side of the outer frame. The propulsion assembly includes a connecting pipe fixedly inserted into the top of a straight pipe, an installation pipe fixedly inserted into the top of the connecting pipe, a second piston plate movably connected inside the installation pipe, a push rod fixedly connected to the right side of the second piston plate, an air suction frame configured on the right side of the push rod, a connecting rod fixedly connected between the right side of the air suction frame and the outer frame, and bristles fixedly connected to the inner side of the outer frame.

[0012] Preferably, an air intake pipe is fixedly inserted into the left side of the air intake frame.

[0013] Preferably, a flow limiting component is provided on the right side of the blocking frame. The flow limiting component includes a chamber opened inside the blocking frame and a ring frame disposed on the right side of the blocking frame. A conduit is fixedly inserted between the inside of the ring frame and the chamber. A first elastic membrane is fixedly connected to the ring side of the ring frame, and a second elastic membrane is fixedly connected to the outside of the chamber. The elasticity of the second elastic membrane is less than that of the first elastic membrane.

[0014] Preferably, an extension ring is fixedly connected to the outer side of the cylinder, and a spiral groove is formed on the outer side of the extension ring. A guide slider is fixedly connected to the inner side of the suction frame, and the guide slider moves inside the spiral groove.

[0015] Preferably, a main block slides on the top of the placement rack, a support block is fixed on the left side of the main block at the top of the placement rack, a first electric telescopic rod is fixed at the rear end of the top of the main block, a clamping block is fixed on the output shaft of the first electric telescopic rod, and a second electric telescopic rod is fixed between the placement rack and the main block.

[0016] Preferably, a cleaning assembly is disposed on the right side of the outer frame. The cleaning assembly includes a jet frame rotatably connected to the right side of the outer frame. The jet frame has jet holes on its inner side. A mounting plate is fixedly connected to the bottom of the jet frame. The cleaning assembly also includes a curved frame fixed to the left side of the support block. A corrugated bladder is fixedly connected between the curved frame and the mounting plate. An air pipe is fixedly inserted between the corrugated bladder and the jet frame. A round rod is slidably connected inside the mounting plate. The right end of the round rod is fixedly connected to the support block. A second spring is fixedly connected between the mounting plate and the support block.

[0017] Preferably, a solenoid valve is installed inside the venting pipe, a through groove is opened near the corrugated bladder of the venting pipe, and an elastic bladder is fixedly connected to the outside of the venting pipe outside the through groove.

[0018] A laser marking method based on heat exchanger manufacturing includes the following steps:

[0019] S1. Placement: Place the U-shaped heat exchange tube on the placement rack;

[0020] S2. Marking: Permanent markings are made on the surface of the U-shaped heat exchange tube using the marking component.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Through the action of the jet assembly, low-temperature inert gas is sprayed from the outer frame onto the outer surface of the heat exchange tube, and blown into the interior of the moving tube through another branch end. It is also introduced into the interior of the heat exchange tube from the right end of the baffle. The low-temperature inert gas can accelerate the cooling of the copper heat diffusion area, reduce the deformation or micro-cracks of the thin-walled heat exchange tube that may be caused by local thermal expansion, and improve the quality of the product. On the other hand, the introduction of inert gas reduces the oxidation of copper due to high temperature and avoids the oxide layer from falling off, which affects the marking effect.

[0023] 2. Because the outer frame moves from left to right with the brush bristles before marking, it can clean the area to be marked, thereby removing impurities from the surface of the heat exchange tube and reducing the possibility of uneven marking or poor adhesion caused by uncleaned surfaces, thus further improving the marking quality.

[0024] 3. Due to the sealing effect of the first elastic membrane, when gas enters the interior of the heat exchange tube, only a small amount of inert gas passes through the first elastic membrane, allowing more inert gas to be sprayed from the outer frame to the outside of the heat exchange tube. This ensures a better cooling and anti-oxidation effect on the outside of the heat exchange tube.

[0025] 4. As the suction frame moves to the right, the suction frame rotates along with the connecting rod and the outer frame under the action of the guide slider and the spiral groove. At this time, the outer frame can rotate with the brush bristles to improve the cleaning effect on the marking position of the heat exchange tube. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is an overall structural view of the present invention;

[0028] Figure 2 This is a cross-sectional view of the placement box of the present invention;

[0029] Figure 3 This is a partial structural schematic diagram of the placement rack of the present invention;

[0030] Figure 4 This is a schematic diagram of a half-section of the extension ring of the present invention;

[0031] Figure 5 This is a partial structural diagram of the main block of the present invention;

[0032] Figure 6 This is a partial structural diagram of the left side of the placement rack of the present invention;

[0033] Figure 7 This is a schematic diagram of a half-section of the straight tube of the present invention;

[0034] Figure 8 This is a schematic diagram of a half-section of the air intake frame of the present invention;

[0035] Figure 9 This is a partial structural schematic diagram of the current limiting component of the present invention;

[0036] Figure 10 This is a partial structural schematic diagram of the air intake frame of the present invention;

[0037] Figure 11 This is a partial structural diagram of the cleaning assembly of the present invention;

[0038] Figure 12 This is a schematic diagram of a half-section of the jet frame of the present invention;

[0039] Figure 13 This is a half-sectional structural diagram of the mounting plate of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Support base; 2. Placement box; 3. Marking assembly; 4. Limiting assembly; 41. Straight pipe; 42. Cylinder; 43. First piston plate; 44. Blocking frame; 45. Small ring; 46. First spring; 5. Jet assembly; 51. Outer frame; 52. Motion pipe; 53. Branch pipe; 6. Propulsion assembly; 61. Connecting pipe; 62. Mounting pipe; 63. Second piston plate; 64. Push rod; 65. Inhalation frame; 66. Connecting rod; 7. Flow limiting assembly; 71. Chamber; 72. Ring frame; 73. Conduit; 74. First spring. 75. Membrane; 8. Second elastic membrane; 9. Cleaning assembly; 10. Air jet frame; 11. Air jet hole; 12. Mounting plate; 13. Bend frame; 14. Corrugated bladder; 15. Vent pipe; 16. Round rod; 17. Second spring; 18. Solenoid valve; 19. Through groove; 10. Elastic bladder; 11. Brush bristles; 12. Suction pipe; 13. Extension ring; 14. Spiral groove; 15. Guide slider; 16. Main block; 17. Support block; 18. First electric telescopic rod; 19. Clamping block; 10. Second electric telescopic rod; 11. Placement rack. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1: Please refer to Figures 1 to 12 The present invention provides a technical solution: a laser marking machine based on heat exchanger production, including a support base 1, a placement box 2 fixed on the top of the support base 1, and a marking component 3 disposed inside the placement box 2. The laser marking machine emits laser marking, which is a mature existing technology. It emits laser to make permanent marks on the surface of the workpiece, and will not be described in detail.

[0044] A main block 14 slides on the top of the placement rack 19. A support block 15 is fixed on the top of the placement rack 19 to the left of the main block 14. A first electric telescopic rod 16 is fixed to the rear end of the top of the main block 14. A clamping block 17 is fixed to the output shaft of the first electric telescopic rod 16. A second electric telescopic rod 18 is fixed between the placement rack 19 and the main block 14.

[0045] The marking component 3 emits a laser to mark the heat exchange tubes of the heat exchanger. The top of the support base 1 is equipped with a placement frame 19 for placing the heat exchange tubes. The laser marking machine also includes a limiting component 4 disposed on the left side of the placement frame 19. The limiting component 4 is used to cooperate with the placement frame 19 to limit the heat exchange tubes and prevent them from shifting during marking. The limiting component 4 includes a straight tube 41 fixedly connected to the left side of the placement frame 19. A cylinder 42 is fixedly fixed to the right side of the straight tube 41. A first piston plate 43 is fixedly connected inside the cylinder 42. A blocking frame 44 is fixedly fixed to the right side of the first piston plate 43. A small ring 45 is fixedly connected inside the straight tube 41. A first spring 46 is fixedly connected between the small ring 45 and the first piston plate 43. The right side of the blocking frame 44 has a smaller diameter.

[0046] By adopting the above technical solution, the top front and rear ends of the main block 14 and the support block 15 are provided with grooves that are adapted to the heat exchange tubes, and the bottom of the clamping block 17 is also provided with a groove corresponding to the groove on the main block 14. Anti-slip pads are adhered inside the grooves of the main block 14 and the grooves of the clamping block 17. Before marking, the output shaft of the first electric telescopic rod 16 extends and the U-shaped heat exchange tube to be marked is placed above the main block 14 and the support block 15. The side of the U-shaped heat exchange tube that is not open is attached to the inner side of the placement rack 19, and the groove corresponds to the heat exchange tube. Then, the output shaft of the first electric telescopic rod 16 retracts, so that the bottom of the clamping block 17 is attached to the top of the main block 14. At this time, the main block 14 and the clamping block 17 clamp the U-shaped heat exchange tube. Then, the output shaft of the second electric telescopic rod 18 extends, so that the main block 14 moves to the left with the heat exchange tube.

[0047] Under the limiting effect of the groove, the front opening of the U-shaped heat exchange tube can be aligned with the blocking frame 44. As the output shaft of the second electric telescopic rod 18 extends, the front opening of the U-shaped heat exchange tube approaches the blocking frame 44 and squeezes the blocking frame 44. At this time, the smaller diameter part of the right side of the blocking frame 44 rises into the interior of the heat exchange tube. When the blocking frame 44 is squeezed, the blocking frame 44 moves to the left with the first piston plate 43. At this time, the first spring 46 is compressed. When the output extension of the second electric telescopic rod 18 stops and remains stationary, the elastic force of the first spring 46 helps to clamp the heat exchange tube, preventing the heat exchange tube from shifting during marking, thereby avoiding the situation of marking deviation and improving the quality of the left mark.

[0048] The laser marking machine also includes an air jet assembly 5 disposed outside the blocking frame 44. The air jet assembly 5 is used to spray low-temperature inert gas. The air jet assembly 5 includes an outer frame 51 disposed outside the blocking frame 44. A motion tube 52 is fixedly inserted into the inside of the first piston plate 43. The air jet assembly 5 also includes a branch tube 53. The branch ends of the branch tube 53 are respectively inserted into the inside of the motion tube 52 and the outer frame 51.

[0049] The motion tube 52 passes through the inside of the first spring 46, and the branch tube 53 is made of flexible material. The design of the flexible material ensures that the motion tube 52 does not affect the movement of the outer frame 51 and the stop frame 44.

[0050] By adopting the above technical solution, during use, low-temperature inert gas is introduced from the ends of the outer frame 51 and the baffle 44 of the branch pipe 53, so that the low-temperature inert gas is sprayed from the outer frame 51 onto the outer surface of the heat exchange tube, and blown into the interior of the moving tube 52 through another branch end, and introduced into the interior of the heat exchange tube from the right end of the baffle 44.

[0051] Low-temperature inert gas can accelerate the cooling of the copper heat diffusion area, reduce the deformation or micro-cracks in thin-walled heat exchange tubes that may be caused by local thermal expansion, and improve product quality. On the other hand, the introduction of inert gas can reduce the oxidation of copper due to high temperature and avoid the oxide layer from peeling off, which would affect the marking effect.

[0052] This allows for cooling of the heat exchange tubes from both the inside and outside, resulting in more uniform cooling and reducing the likelihood of heat exchange tube deformation.

[0053] The laser marking machine also includes a propulsion assembly 6 located on the left side of the outer frame 51. The propulsion assembly 6 includes a connecting pipe 61 fixedly inserted into the top of a straight pipe 41, an installation pipe 62 fixedly inserted into the top of the connecting pipe 61, a second piston plate 63 movably connected inside the installation pipe 62, a push rod 64 fixedly connected to the right side of the second piston plate 63, an air suction frame 65 located on the right side of the push rod 64, a connecting rod 66 fixedly connected between the right side of the air suction frame 65 and the outer frame 51, and brush bristles 9 fixedly connected to the inner side of the outer frame 51.

[0054] The space between the first piston plate 43 and the second piston plate 63 inside the cylinder 42, the straight tube 41 and the mounting tube 62 is partially filled with a medium, and the right end of the push rod 64 is rotatably connected with a ball to reduce friction.

[0055] By adopting the above technical solution, when the output shaft of the second electric telescopic rod 18 extends, and the front opening of the U-shaped heat exchange tube approaches the blocking frame 44 and squeezes the blocking frame 44, the blocking frame 44 moves to the left with the first piston plate 43. At this time, under the pressure of the medium, the second piston plate 63 can move to the right, causing the push rod 64 to push the suction frame 65, causing the suction frame 65 to move to the right with the connecting rod 66 and the outer frame 51. When the output shaft of the second electric telescopic rod 18 stops extending, the suction frame 65 moves to the left side of the marking position, while the outer frame 51 moves to the right side of the marking position.

[0056] Before marking, the outer frame 51 moves from left to right with the brush bristles 9, which can clean the area to be marked, thereby removing impurities from the surface of the heat exchange tube and reducing the problem of uneven marking or poor adhesion that may be caused by uncleaned surfaces, thus further improving the marking quality.

[0057] An air intake pipe 10 is fixedly inserted into the left side of the air intake frame 65.

[0058] By adopting the above technical solution, the external part of the suction pipe 10 is connected to the external suction equipment. The suction pipe 10 is made of flexible hose material. When laser marking is performed, the suction pipe 10 will absorb the generated smoke and reduce environmental pollution.

[0059] A flow limiting component 7 is configured on the right side of the blocking frame 44. The flow limiting component 7 includes a chamber 71 opened inside the blocking frame 44. The flow limiting component 7 also includes a ring frame 72 configured on the right side of the blocking frame 44. A conduit 73 is fixedly inserted between the inside of the ring frame 72 and the chamber 71. A first elastic membrane 74 is fixedly connected to the ring side of the ring frame 72. A second elastic membrane 75 is fixedly connected to the outside of the chamber 71. The elasticity of the second elastic membrane 75 is less than the elasticity of the first elastic membrane 74.

[0060] By adopting the above technical solution, the annular side of the chamber 71 and the ring frame 72 is filled with more air. Since the elasticity of the second elastic membrane 75 is less than that of the first elastic membrane 74, the second elastic membrane 75 is in an expanded state in the initial state. The elasticity of the first elastic membrane 74 is greater, so it does not expand. Since the first elastic membrane 74 is expanded at this time, it is convenient to insert the heat exchange tube into the position with the smaller diameter on the right side of the baffle frame 44.

[0061] When the front opening of the U-shaped heat exchange tube approaches the baffle 44 and squeezes the baffle 44, the front opening of the U-shaped heat exchange tube will squeeze the second elastic membrane 75. At this time, the second elastic membrane 75 contracts. Under the pressure of the air inside the chamber 71 and the ring frame 72, the first elastic membrane 74 can expand. After the first elastic membrane 74 expands, the outer side of the first elastic membrane 74 approaches the inner side of the heat exchange tube. When low-temperature inert gas is introduced from the branch pipe 53, due to the sealing effect of the first elastic membrane 74, when the gas enters the interior of the heat exchange tube, only a small amount of inert gas passes through the first elastic membrane 74, causing more inert gas to be sprayed from the outer frame 51 to the outside of the heat exchange tube. This ensures a good cooling and anti-oxidation effect on the outside of the heat exchange tube.

[0062] An extension ring 11 is fixedly connected to the outer side of the cylinder 42. A spiral groove 12 is provided on the outer side of the extension ring 11. A guide slider 13 is fixedly connected to the inner side of the suction frame 65. The guide slider 13 moves inside the spiral groove 12, and the suction frame 65 moves outside the extension ring 11.

[0063] By adopting the above technical solution, when the front opening of the U-shaped heat exchange tube approaches the blocking frame 44 and squeezes the blocking frame 44, the second piston plate 63 moves to the right, and the push rod 64 pushes the suction frame 65. While the suction frame 65 moves to the right, under the action of the guide slider 13 and the spiral groove 12, the suction frame 65 rotates with the connecting rod 66 and the outer frame 51. At this time, the outer frame 51 can rotate with the brush bristles 9, which improves the cleaning effect on the marking position of the heat exchange tube.

[0064] It should be noted that when the outer frame 51 moves to the right side of the marking position, the connecting rod 66 rotates to the front and rear ends and does not obstruct the marking.

[0065] It should be noted that the pitch of the spiral groove 12 is relatively large. When the suction frame 65 rotates with the connecting rod 66 and the outer frame 51, the rotation angle is less than 270 degrees, which reduces the influence of the branch pipe 53 and the suction pipe 10 on the movement of the suction frame 65 and the outer frame 51.

[0066] Example 2: The technical solution of this example differs from that of Example 1 in that: Figures 1 to 6 and Figures 11 to 13 A cleaning assembly 8 is arranged on the right side of the outer frame 51. The cleaning assembly 8 includes a jet frame 81 rotatably connected to the right side of the outer frame 51. A jet hole 82 is opened on the inner side of the jet frame 81. A mounting plate 83 is fixedly connected to the bottom of the jet frame 81. The cleaning assembly 8 also includes a curved frame 84 fixed to the left side of the support block 15. A corrugated bladder 85 is fixedly connected between the curved frame 84 and the mounting plate 83. A vent pipe 86 is fixedly inserted between the corrugated bladder 85 and the jet frame 81. A round rod 87 is slidably connected inside the mounting plate 83. The right end of the round rod 87 is fixedly connected to the support block 15. A second spring 88 is fixedly connected between the mounting plate 83 and the support block 15.

[0067] By adopting the above technical solution, when the suction frame 65 moves to the right with the outer frame 51, the jet frame 81 moves to the right with the mounting plate 83, so that the mounting plate 83 cooperates with the bending frame 84 to squeeze, thereby compressing the bellows 85. At this time, the gas inside the bellows 85 enters the interior of the jet frame 81 through the vent pipe 86 and is ejected from the jet hole 82, which facilitates the blowing out of gas when the brush 9 cleans the heat exchange tube to improve the cleaning effect.

[0068] After the marking is completed, the output shaft of the second electric telescopic rod 18 retracts. At this time, under the elastic force of the second spring 88, it is easy for the mounting plate 83 and the jet frame 81 and other structures to reset. When the corrugated bladder 85 expands, it draws air through the jet hole 82.

[0069] An electromagnetic valve 89 is installed inside the vent pipe 86. A through groove 810 is opened near the corrugated bladder 85 in the vent pipe 86. An elastic bladder 811 is fixedly connected to the outside of the vent pipe 86 outside the through groove 810.

[0070] By adopting the above technical solution, during the compression process of the bellows 85, the solenoid valve 89 is intermittently closed and then opened by the external controller. When the solenoid valve 89 is closed, the gas generated by the compression of the bellows 85 enters the interior of the elastic bladder 811, at which time the elastic bladder 811 expands. When the solenoid valve 89 is opened, the elastic force of the elastic bladder 811 facilitates the rapid ejection of the gas inside the elastic bladder 811. This design is beneficial for instantly blowing away heavy objects such as metal shavings, thereby improving the cleaning effect and avoiding the influence of impurities on the cleaning effect.

[0071] A laser marking method based on heat exchanger manufacturing includes the following steps:

[0072] S1. Placement: The top front and rear ends of the main block 14 and the support block 15 are provided with grooves that are compatible with the heat exchange tube. The bottom of the clamping block 17 is also provided with a groove corresponding to the groove on the main block 14. Anti-slip pads are adhered inside the grooves of the main block 14 and the clamping block 17. Before marking, the output shaft of the first electric telescopic rod 16 extends to place the U-shaped heat exchange tube to be marked above the main block 14 and the support block 15. The closed side of the U-shaped heat exchange tube is attached to the inner side of the placement frame 19, and the groove corresponds to the heat exchange tube. Then, the output shaft of the first electric telescopic rod 16 retracts, so that the bottom of the clamping block 17 is attached to the top of the main block 14. At this time, the main block 14 and the clamping block 17 clamp the U-shaped heat exchange tube. Then, the output shaft of the second electric telescopic rod 18 extends to facilitate the main block 14 to move the heat exchange tube to the left.

[0073] Under the limiting action of the groove, the front opening of the U-shaped heat exchange tube can be aligned with the blocking frame 44. As the output shaft of the second electric telescopic rod 18 extends, the front opening of the U-shaped heat exchange tube approaches the blocking frame 44 and squeezes the blocking frame 44. Under the elastic force of the first spring 46, it is beneficial to clamp the heat exchange tube and prevent the heat exchange tube from shifting during marking, thereby avoiding the situation of marking deviation and improving the quality of the mark left.

[0074] S2, Marking: Laser is emitted from the marking component 3 to create a permanent mark on the surface of the workpiece.

[0075] Working principle: Low-temperature inert gas is introduced from the end of the outer frame 51 and the baffle 44 through the branch pipe 53, so that the low-temperature inert gas is sprayed from the outer frame 51 onto the outer surface of the heat exchange tube, and blown into the interior of the moving tube 52 through another branch end, and introduced into the interior of the heat exchange tube from the right end of the baffle 44.

[0076] Low-temperature inert gas can accelerate the cooling of the copper heat diffusion area, reduce the deformation or micro-cracks in thin-walled heat exchange tubes that may be caused by local thermal expansion, and improve product quality. On the other hand, the introduction of inert gas can reduce the oxidation of copper due to high temperature and avoid the oxide layer from peeling off, which would affect the marking effect.

[0077] When the output shaft of the second electric telescopic rod 18 extends, and the front opening of the U-shaped heat exchange tube approaches the blocking frame 44 and squeezes the blocking frame 44, the blocking frame 44 moves to the left along with the first piston plate 43. At this time, under the pressure of the medium, since the outer frame 51 moves from left to right with the brush 9 before marking, the area to be marked can be cleaned, thereby facilitating the removal of impurities on the surface of the heat exchange tube and reducing the problem of uneven marking or poor adhesion that may be caused by uncleaned surfaces.

[0078] When the front opening of the U-shaped heat exchange tube approaches the baffle 44 and compresses the baffle 44, the front opening of the U-shaped heat exchange tube will compress the second elastic membrane 75. The second elastic membrane 75 contracts, and under the pressure of the air inside the chamber 71 and the ring frame 72, the first elastic membrane 74 expands. After the first elastic membrane 74 expands, its outer side approaches the inner side of the heat exchange tube. When low-temperature inert gas is introduced from the branch pipe 53, due to the sealing effect of the first elastic membrane 74, only a small amount of inert gas passes through the first elastic membrane 74 when the gas enters the interior of the heat exchange tube, causing a larger amount of inert gas to be sprayed from the outer frame 51 to the outside of the heat exchange tube. When the frame 44 is pressing, the second piston plate 63 moves to the right, and the push rod 64 pushes the suction frame 65. While the suction frame 65 moves to the right, under the action of the guide slider 13 and the spiral groove 12, the suction frame 65 rotates with the connecting rod 66 and the outer frame 51. At this time, the outer frame 51 can rotate with the brush bristles 9 to improve the cleaning effect on the marking position of the heat exchange tube. When the suction frame 65 moves to the right with the outer frame 51, the jet frame 81 moves to the right with the mounting plate 83, so that the mounting plate 83 cooperates with the bending frame 84 to press, thereby compressing the bellows 85. At this time, the gas inside the bellows 85 enters the interior of the jet frame 81 through the vent pipe 86 and is ejected from the jet hole 82, which facilitates the blowing out of gas when the brush bristles 9 clean the heat exchange tube to improve the cleaning effect.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser marking machine based on heat exchanger production, comprising a support base (1), a placement box (2) fixed on the top of the support base (1), a marking component (3) disposed inside the placement box (2) on the top of the support base (1), the marking component (3) emitting laser to mark the heat exchange tubes of the heat exchanger, and a placement rack (19) for placing the heat exchange tubes disposed on the top of the support base (1), characterized in that, Laser marking machines also include: The limiting component (4) is disposed on the left side of the placement frame (19). The limiting component (4) is used to cooperate with the placement frame (19) to limit the heat exchange tube and prevent the heat exchange tube from shifting during marking. The limiting component (4) includes a straight tube (41) fixedly connected to the left side of the placement frame (19). A cylinder (42) is fixedly connected to the right side of the straight tube (41). A first piston plate (43) is fixedly connected inside the cylinder (42). A blocking frame (44) is fixedly connected to the right side of the first piston plate (43). A small ring (45) is fixedly connected inside the straight tube (41). A first spring (46) is fixedly connected between the small ring (45) and the first piston plate (43). The jet assembly (5) is disposed outside the stop frame (44). The jet assembly (5) is used to spray low-temperature inert gas. The jet assembly (5) includes an outer frame (51) disposed outside the stop frame (44). A motion tube (52) is fixedly inserted into the inside of the first piston plate (43). The jet assembly (5) also includes a branch tube (53). The branch ends of the branch tube (53) are respectively inserted into the motion tube (52) and the inside of the outer frame (51). The propulsion assembly (6) is located on the left side of the outer frame (51). The propulsion assembly (6) includes a connecting pipe (61) fixedly inserted into the top of a straight pipe (41). An installation pipe (62) is fixedly inserted into the top of the connecting pipe (61). A second piston plate (63) is movably connected inside the installation pipe (62). A push rod (64) is fixedly connected to the right side of the second piston plate (63). An air intake frame (65) is arranged on the right side of the push rod (64). A connecting rod (66) is fixedly connected between the right side of the air intake frame (65) and the outer frame (51). A brush (9) is fixedly connected to the inner side of the outer frame (51). A flow limiting assembly (7) is arranged on the right side of the blocking frame (44). The flow limiting assembly (7) includes components opened on the blocking frame. (44) The internal chamber (71) and the flow limiting assembly (7) also include a ring frame (72) configured to the right of the blocking frame (44). A conduit (73) is fixedly inserted between the inside of the ring frame (72) and the chamber (71). A first elastic membrane (74) is fixedly connected to the ring side of the ring frame (72). A second elastic membrane (75) is fixedly connected to the outside of the chamber (71). The elasticity of the second elastic membrane (75) is less than that of the first elastic membrane (74). An extension ring (11) is fixedly connected to the outside of the cylinder (42). A spiral groove (12) is opened on the outside of the extension ring (11). A guide slider (13) is fixedly connected to the inside of the suction frame (65). The guide slider (13) moves inside the spiral groove (12).

2. The laser marking machine based on a heat exchanger as described in claim 1, characterized in that: The motion tube (52) passes through the inside of the first spring (46), and the branch tube (53) is made of flexible material.

3. The laser marking machine based on a heat exchanger as described in claim 1, characterized in that: An air intake pipe (10) is fixedly inserted into the left side of the air intake frame (65).

4. A laser marking machine based on a heat exchanger as described in claim 1, characterized in that: A main block (14) slides on the top of the placement rack (19). A support block (15) is fixed on the top of the placement rack (19) to the left of the main block (14). A first electric telescopic rod (16) is fixed at the rear end of the top of the main block (14). A clamping block (17) is fixed on the output shaft of the first electric telescopic rod (16). A second electric telescopic rod (18) is fixed between the placement rack (19) and the main block (14).

5. A laser marking machine based on a heat exchanger as described in claim 1, characterized in that: A cleaning assembly (8) is arranged on the right side of the outer frame (51). The cleaning assembly (8) includes a jet frame (81) rotatably connected to the right side of the outer frame (51). A jet hole (82) is opened on the inner side of the jet frame (81). A mounting plate (83) is fixedly connected to the bottom of the jet frame (81). The cleaning assembly (8) also includes a curved frame (84) fixed to the left side of the support block (15). A corrugated bladder (85) is fixedly connected between the curved frame (84) and the mounting plate (83). A vent pipe (86) is fixedly inserted between the corrugated bladder (85) and the jet frame (81). A round rod (87) is slidably connected inside the mounting plate (83). The right end of the round rod (87) is fixedly connected to the support block (15). A second spring (88) is fixedly connected between the mounting plate (83) and the support block (15).

6. A laser marking machine based on a heat exchanger as described in claim 5, characterized in that: An electromagnetic valve (89) is installed inside the venting tube (86). A through groove (810) is provided near the corrugated bladder (85) of the venting tube (86). An elastic bladder (811) is fixedly connected to the outside of the through groove (810) of the venting tube (86).

7. A laser marking method based on heat exchanger production, characterized in that: This method is applicable to the laser marking machine based on a heat exchanger as described in any one of claims 1-6, and includes the following steps: S1. Placement: Place the U-shaped heat exchange tube on the placement rack (19); S2, Marking: A permanent mark is made on the surface of the U-shaped heat exchange tube by using the marking component (3).

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