Laser welding cooling device

Abstract

The invention discloses a laser welding cooling device, which relates to the technical field of welding, and comprises a laser welding hood and a welding base, and further comprises a laser welding head mounted in the laser welding hood; the laser welding head is composed of a laser emitting head, a laser generator and a lens fixedly installed in the laser emitting head through an installation frame, a heat conduction mechanism matched with the installation frame is installed on the laser welding head, and a cooling circulation mechanism matched with the heat conduction mechanism is installed on the laser welding head. The laser welding head cooling device has the advantages that when a lens in a laser welding head is cooled, multi-stage cooling is adopted, the temperature on the lens can be more accurately controlled, in the initial stage, automatic cooling and heat dissipation are conducted through phase change paraffin, energy consumption is low, temperature control is accurate, a pump machine operates stably, cooling liquid flows stably, and laser beams are effectively influenced by operation of the pump machine.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to a laser welding cooling device. Background Art

[0002] In modern manufacturing, laser welding technology is widely used in aerospace, automobile manufacturing, electronics and other fields due to its significant advantages such as high energy density, fast welding speed and small heat-affected zone. During the laser welding process, the high energy of the laser beam will generate a large amount of heat in the welding area. If the heat cannot be dissipated in a timely and effective manner, the focusing lens in the laser welding equipment will be degraded due to overheating or even damaged, which will seriously affect the stability of the laser.

[0003] At present, most common laser welding cooling devices use a single water cooling or air cooling method. When using water cooling, although the cooling efficiency is relatively high, the circulation of the coolant is driven by the pump, and the cooling needs to be adjusted in real time according to the temperature on the lens. The current method is to adjust the flow rate of the coolant by adjusting the operating power of the water pump. This adjustment method will cause damage to the pump due to frequent frequency changes, and will also produce frequent flow rate differences, thereby increasing the vibration frequency, affecting the stability of the laser, and resulting in reduced welding quality.

[0004] Therefore, a new type of laser welding cooling device can be used to solve the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that variable frequency cyclic vibration of the coolant affects the stability of the laser, and to propose a laser welding cooling device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A laser welding cooling device comprises a laser welding cover and a welding base, and also comprises a laser welding head installed inside the laser welding cover; The laser welding head is composed of a laser emitting head, a laser generator, and a lens fixedly mounted inside the laser emitting head via a mounting frame. The laser welding head is equipped with a heat conducting mechanism that cooperates with the mounting frame, and the laser welding head is equipped with a cooling circulation mechanism that cooperates with the heat conducting mechanism. The heat conduction mechanism consists of a first annular heat conduction plate, an annular heat conduction box, an annular water tank divided into two upper and lower chambers by an annular partition, multiple first heat conduction rods and multiple second heat conduction rods. Each second heat conduction rod is equipped with an expansion mechanism. The second heat conduction rod extends into the lower chamber of the annular water tank. The second annular heat conduction plate conducts the heat on the mounting frame to the annular heat conduction box through the first heat conduction rod. The annular heat conduction box is filled with phase change material paraffin. The annular water tank and the annular heat conduction box are jointly equipped with multiple auxiliary heat conduction structures that cooperate with the mounting frame to speed up the heat dissipation.

[0007] Preferably, the mounting frame consists of a connecting ring and a second annular heat conducting plate, the connecting ring is fixedly connected to the protective cover, the lens is fixedly connected to the second annular heat conducting plate, and the second annular heat conducting plate is fixedly connected to the connecting ring.

[0008] Preferably, a protective gas injector matched with the laser welding head is fixedly mounted on the laser welding machine cover.

[0009] Preferably, the auxiliary heat-conducting structure comprises a fixed column fixedly mounted on the annular water tank, and an arc-shaped heat-conducting plate cooperating with the connecting ring is mounted on the fixed column via an elastic telescopic frame; A plurality of elastic telescopic rods are fixedly mounted on the arc-shaped heat conducting plate, and a heat conducting plate is fixedly mounted on one end of the plurality of elastic telescopic rods away from the arc-shaped heat conducting plate. The heat conducting plate passes through and extends into the upper chamber of the annular water tank. A movable component that cooperates with the arc-shaped heat conducting plate is jointly mounted on the annular heat conducting box and the annular water tank. A spiral plate is fixedly mounted in the upper chamber of the annular water tank, and a baffle is fixedly mounted in the lower chamber of the annular water tank. A first water outlet pipe and a water inlet pipe are fixedly connected on both sides of the baffle respectively. A water guide hole connecting the upper and lower chambers is opened on the annular partition. A second water outlet pipe connected to the upper chamber is fixedly connected on the annular water tank, and the second water outlet pipe is connected to the first water outlet pipe through a hose.

[0010] Preferably, the movable component includes a piston ring slidably mounted inside the annular heat conducting box, a plurality of pillars are fixedly mounted on the piston ring, each of the pillars passes through and extends out of the annular heat conducting box from above, a plurality of second permanent magnets are fixedly mounted on the piston ring, and a plurality of first permanent magnets matching the corresponding second permanent magnets are fixedly mounted on the top wall of the annular heat conducting box; A pushing frame is fixedly installed on each of the pillars, and a plurality of telescopic rods are fixedly installed on the top of the annular water tank. Each of the pushing frames is rotatably connected to the telescopic end of the corresponding telescopic rod, and a first pressure head is fixedly installed on the telescopic end of each telescopic rod. A push rod is slidably installed on the fixed column, and the push rod is fixedly connected to the arc-shaped heat conducting plate. A second pressure head that cooperates with the first pressure head is fixedly installed on the end of the push rod away from the arc-shaped heat conducting plate.

[0011] Preferably, the expansion mechanism includes a hollow heat-conducting rod fixedly mounted on the second heat-conducting rod, a plurality of umbrella rib blocking plates are rotatably mounted on the hollow heat-conducting rod, and an opening and closing structure that cooperates with the umbrella rib blocking plates is installed between the plurality of telescopic rods and the annular water tank.

[0012] Preferably, the opening and closing structure includes a sliding rod fixedly mounted on the telescopic end of the telescopic rod, each of the sliding rods passes through the corresponding fixed end of the telescopic rod, and a hollow sliding ring is fixedly mounted on the plurality of sliding rods. A plurality of linkage rod groups are mounted on the hollow sliding ring, and each linkage rod group is composed of a plurality of linkage rods, and each linkage rod is rotatably connected to the hollow sliding ring, and an end of each linkage rod away from the hollow sliding ring is rotatably connected to the corresponding umbrella rib blocking plate, and a trapezoidal sealing plug that matches the water guide hole is fixedly mounted on one of the sliding rods.

[0013] Preferably, the angle between each connecting rod and the corresponding umbrella rib blocking plate is set between thirty degrees and forty-five degrees.

[0014] Preferably, the cooling circulation mechanism includes a pump fixedly mounted on the laser welding head, a coolant storage tank fixedly mounted on the pump, and coolant circulation is achieved between the pump and the first water outlet pipe and the water inlet pipe through a circulation pipeline. A cooler is installed on the circulation pipeline to accelerate the cooling of the coolant in the circulation pipeline.

[0015] Preferably, nano-scale grooves are processed on the surfaces of the first heat-conducting rod and the second heat-conducting rod. The nano-scale grooves on the second heat-conducting rod utilize the capillary effect to guide the rapid diffusion of the condensate, and the nano-scale grooves on the first heat-conducting rod increase the contact area with the paraffin, thereby achieving the purpose of enhancing the evaporative heat dissipation efficiency.

[0016] Compared with the existing technology, the advantages of the present invention are: 1. When cooling the lens inside the laser welding head, this laser welding cooling device uses phase change material paraffin to absorb heat from the lens and preserve the heat to maintain the temperature of the lens, ensuring that the operating temperature of the lens is within the appropriate temperature and reducing the probability of lens deformation. Compared with direct water cooling, it can automatically cool and dissipate heat at low temperatures without starting a pump for heat dissipation, resulting in more precise temperature control and lower energy consumption.

[0017] 2. When cooling the lens inside the laser welding head, this laser welding cooling device cools the paraffin after phase change by setting up an annular water tank with upper and lower chambers. It operates when the paraffin is not completely melted. At this time, the circulating water only circulates through the lower chamber of the annular water tank. The space of the lower chamber is small, the amount of water required is small, the energy consumption is low, and the lens is indirectly cooled and dissipated through the paraffin, which makes the temperature control more precise.

[0018] 3. When the laser welding cooling device cools down the lens inside the laser welding head, after the paraffin is completely melted, the paraffin absorbs more heat and generates more heat on the lens. At this time, the melted paraffin will increase its volume, driving the sealing plug to move and opening the water guide hole. At this time, the circulating water channel passes not only through the lower chamber, but also through the upper chamber, and drives the auxiliary heat conduction structure to operate, directly dissipating the heat from the connecting ring of the lens, thereby improving the cooling efficiency. At the same time, the single lower chamber is changed to the upper and lower chambers for joint circulation, thereby improving the heat dissipation efficiency without changing the pump power, and effectively reducing the probability of the pump variable frequency vibration affecting the laser stability.

[0019] 4. When cooling the internal lens of the laser welding head and implementing dual-chamber circulation cooling, this laser welding cooling device uses a sliding rod, a hollow sliding ring and a connecting rod to drive the umbrella rib blocking plate to rotate and expand, so that the hollow heat-conducting rod on the second heat-conducting rod is exposed, increasing the contact area with the coolant in the lower chamber of the annular water tank, so that the coolant can take away heat faster and improve the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic structural diagram of a laser welding cooling device proposed by the present invention; Figure 2 for Figure 1 Detailed diagram of the structure of the laser welding hood after it is rotated to a certain angle; Figure 3 for Figure 2 Detailed schematic diagram of the structure of the internal laser welding head and its surrounding components; Figure 4 for Figure 3 Detailed schematic diagram of the structure after rotation at a certain angle; Figure 5 for Figure 4 Detailed schematic diagram of the structure of the internal lens and cooling circulation mechanism of the laser welding head; Figure 6 for Figure 5 Detailed schematic diagram of the structure after removing the protective cover; Figure 7 for Figure 6A detailed schematic diagram of the enlarged structure of the middle lens, mounting frame, and heat conduction mechanism; Figure 8 for Figure 7 Detailed schematic diagram of the structure after rotation at a certain angle; Figure 9 for Figure 7 Detailed diagram of the structure after removing the mounting frame and lens; Figure 10 for Figure 7 Detailed diagram of the exploded structure of the middle mounting frame and lens; Figure 11 for Figure 9 Detailed schematic cross-sectional view of the structure; Figure 12 for Figure 11 Detailed schematic diagram of the structure after rotation at a certain angle; Figure 13 for Figure 11 Detailed schematic diagram of the structure after removing the spiral plate and auxiliary heat conduction structure; Figure 14 for Figure 13 Detailed schematic diagram of the structure of the hollow sliding ring and the second heat conducting rod; Figure 15 for Figure 14 A detailed diagram of the enlarged structure of part A; Figure 16 for Figure 15 Detailed schematic diagram of the structure of the second heat conducting rod and the expansion mechanism after deployment; Figure 17 for Figure 9 Detailed schematic diagram of the structure after removing the annular water tank and the second heat conducting rod; Figure 18 for Figure 17 Detailed schematic cross-sectional view of the structure; Figure 19 for Figure 18 A schematic detailed diagram of the enlarged structure of one of the auxiliary heat-conducting structures, the piston ring and its surrounding components; Figure 20 for Figure 19 A detailed schematic diagram of the enlarged structure after removing the piston ring and the second permanent magnet; Figure 21 for Figure 20 A schematic detailed diagram of the enlarged structure of part B; Figure 22 for Figure 20 Detailed schematic diagram of the plan structure along one of the angles.

[0021] In the figure: 1 laser welding machine cover, 2 welding base, 3 laser welding head, 4 shielding gas ejector, 5 welding rod, 6 laser emission head, 7 coolant storage tank, 8 pump, 9 laser generator, 10 circulation pipeline, 11 cooler, 12 protective cover, 13 lens, 14 mounting frame, 15 heat conduction mechanism, 16 annular water tank, 17 annular heat conduction box, 18 first water outlet pipe, 19 water inlet pipe, 20 second water outlet pipe, 21 first annular heat conduction plate, 22 first heat conduction rod, 23 second heat conduction rod, 24 auxiliary Heat-conducting auxiliary structure, 25 connecting ring, 26 second annular heat-conducting plate, 27 annular partition, 28 hollow sliding ring, 29 spiral plate, 30 sealing plug, 31 sliding rod, 32 first pressure head, 33 expansion mechanism, 34 umbrella rib sealing plate, 35 hollow heat-conducting rod, 36 connecting rod, 37 heat-conducting plate, 38 arc-shaped heat-conducting plate, 39 elastic telescopic rod, 40 first permanent magnet block, 41 piston ring, 42 second permanent magnet block, 43 fixed column, 44 push rod, 45 pillar, 46 elastic telescopic frame, 47 telescopic rod. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1: Reference Figure 1-Figure 3 、 Figure 5-Figure 22 A laser welding cooling device includes a laser welding cover 1 and a welding base 2, and also includes a laser welding head 3 installed inside the laser welding cover 1; The laser welding head 3 is composed of a laser emitting head 6, a laser generator 9 and a lens 13 fixedly mounted inside the laser emitting head 6 via a mounting frame 14. A heat conducting mechanism 15 that cooperates with the mounting frame 14 is mounted on the laser welding head 3.

[0024] A shielding gas injector 4 cooperating with the laser welding head 3 is fixedly mounted on the laser welding machine cover 1 , a frame is fixedly mounted on the bottom of the laser welding head 3 , and a welding rod 5 is fixedly mounted on the frame.

[0025] In addition to the laser emitting head 6, the laser generator 9 and the lens 13, the laser welding head 3 also has other components. Since it is an existing device, all of its specific components are not described here.

[0026] The shielding gas injector 4 injects inert gas to the welding part of the workpiece during welding to perform anti-oxidation treatment on the welding part and isolate the oxygen in the air.

[0027] The laser welding head 3 emits laser light to melt the welding rod 5, and the molten welding rod 5 drops to the welding position to be welded.

[0028] The mounting frame 14 is composed of a connecting ring 25 and a second ring-shaped heat conduction plate 26, the connecting ring 25 is fixedly connected between the protective sleeve 12, the lens 13 is fixedly connected between the second ring-shaped heat conduction plate 26, and the second ring-shaped heat conduction plate 26 is fixedly connected between the connecting ring 25.

[0029] The lens 13 will heat after being irradiated by laser, at this time, the heat on the lens 13 is absorbed by the second ring-shaped heat conduction plate 26, and part of the temperature is conducted to the connecting ring 25, the connecting ring 25 is used for lossless mounting of the lens 13.

[0030] The heat conduction mechanism 15 is composed of a first ring-shaped heat conduction plate 21, a ring-shaped heat conduction box 17, a ring-shaped water tank 16 which is divided into upper and lower chambers by a ring-shaped partition 27, a plurality of first heat conduction rods 22 and a plurality of second heat conduction rods 23, and each second heat conduction rod 23 is provided with an expansion mechanism 33.

[0031] The second heat conduction rod 23 extends into the lower chamber of the ring-shaped water tank 16, the heat on the mounting frame 14 is conducted to the ring-shaped heat conduction box 17 through the first heat conduction rod 22, the ring-shaped heat conduction box 17 is filled with paraffin wax, and a plurality of auxiliary heat conduction structures 24 matched with the mounting frame 14 are installed on the ring-shaped water tank 16 and the ring-shaped heat conduction box 17 to accelerate the heat dissipation speed.

[0032] The heat on the second ring-shaped heat conduction plate 26 is conducted to the ring-shaped heat conduction box 17 through the first heat conduction rod 22, and the solid paraffin wax in the ring-shaped heat conduction box 17 absorbs the heat on the first heat conduction rod 22 to melt the paraffin wax.

[0033] The auxiliary heat conduction structure 24 includes a fixed column 43 fixedly installed on the ring-shaped water tank 16, and an arc-shaped heat conduction plate 38 matched with the connecting ring 25 is installed on the fixed column 43 through an elastic expansion frame 46. A plurality of elastic expansion rods 39 are fixedly installed on the arc-shaped heat conduction plate 38, and a heat conduction plate 37 is fixedly installed at the ends of the plurality of elastic expansion rods 39 away from the arc-shaped heat conduction plate 38, the heat conduction plate 37 penetrates and extends into the upper chamber of the ring-shaped water tank 16, and a moving part matched with the arc-shaped heat conduction plate 38 is installed on the ring-shaped heat conduction box 17 and the ring-shaped water tank 16. When the paraffin is completely melted, the curved heat conducting plate 38 is moved toward the side close to the connecting ring 25 by the movable component, so that the curved heat conducting plate 38 and the connecting ring 25 are in contact. At this time, the heat on the connecting ring 25 is transferred to the curved heat conducting plate 38, and then transferred to the heat conducting plate 37 through the elastic telescopic rod 39. The heat conducting plate 37 extends into the upper chamber of the annular water tank 16. At this time, the coolant circulation in the upper chamber will remove the heat from the heat conducting plate 37.

[0034] The elastic telescopic rod 39 , the heat conducting plate 37 and the arc-shaped heat conducting plate 38 are all made of metal material with good thermal conductivity.

[0035] The moving parts include a piston ring 41 slidably mounted inside the annular heat conducting box 17. A plurality of struts 45 are fixedly mounted on the piston ring 41. Each strut 45 extends from above through the annular heat conducting box 17. A plurality of second permanent magnets 42 are fixedly mounted on the piston ring 41. A plurality of first permanent magnets 40 that cooperate with corresponding second permanent magnets 42 are fixedly mounted on the top wall of the annular heat conducting box 17. (The first permanent magnets 40 and the second permanent magnets 42 have the same magnetic properties, generating a repulsive force. When the paraffin wax transforms from liquid to solid, its volume decreases. The repulsive force between the first permanent magnets 40 and the second permanent magnets 42 causes the piston ring 41 to return to its original position.) A pushing frame is fixedly installed on each pillar 45, and a plurality of telescopic rods 47 are fixedly installed on the top of the annular water tank 16. Each pushing frame is rotatably connected to the telescopic end of the corresponding telescopic rod 47. A first pressure head 32 is fixedly installed on the telescopic end of each telescopic rod 47. A push rod 44 is slidably installed on the fixed column 43. The push rod 44 is fixedly connected to the arc-shaped heat conducting plate 38. A second pressure head cooperating with the first pressure head 32 is fixedly installed on the end of the push rod 44 away from the arc-shaped heat conducting plate 38.

[0036] When the paraffin in the annular heat conduction box 17 is completely melted, the volume of the paraffin in the annular heat conduction box 17 reaches its maximum (the solid phase changes to liquid and the volume increases), which will push the piston ring 41 to move upward, and the piston ring 41 drives the support 45 to move upward, thereby driving the telescopic end of the telescopic rod 47 to extend, and the first pressure head 32 of the telescopic end of the telescopic rod 47 will press the second pressure head on the push rod 44 to make the push rod 44 slide on the fixed column 43 toward the side close to the connecting ring 25, thereby driving the arc-shaped heat conduction plate 38 to move toward the side close to the connecting ring 25 until the arc-shaped heat conduction plate 38 is in contact with the connecting ring 25.

[0037] A spiral plate 29 is fixedly installed in the upper chamber of the annular water tank 16, and a baffle is fixedly installed in the lower chamber of the annular water tank 16. The first water outlet pipe 18 and the water inlet pipe 19 are fixedly connected on both sides of the baffle. A water guide hole connecting the upper and lower chambers is opened on the annular partition 27. A second water outlet pipe 20 connected to the upper chamber is fixedly connected to the annular water tank 16, and the second water outlet pipe 20 is connected to the first water outlet pipe 18 through a hose.

[0038] When the heat is low: the paraffin in the annular heat conduction box 17 absorbs heat. At this time, the heat is not enough to completely melt the paraffin, so the paraffin still has the function of absorbing heat. At this time, the paraffin alone is used to cool the lens 13; When the temperature rises and the paraffin is half melted, the coolant enters the lower chamber of the annular water tank 16 from the water inlet pipe 19, circulates under the annular partition 27, and is then output from the first water outlet pipe 18. The coolant circulates in the lower chamber of the annular water tank 16 and takes away the heat from the first heat-conducting rod 22 inserted into the lower chamber of the annular water tank 16, performing secondary cooling (at this time, the temperature absorbed by the paraffin exceeds the normal operating temperature of the lens 13).

[0039] When the temperature continues to rise and the paraffin is completely melted, the water guide hole opens, and the coolant in the lower chamber enters the upper chamber through the water guide hole. Then, under the action of the spiral plate 29, it flows in a spiral in the upper chamber, and then flows out from the second water outlet pipe 20. The coolant flowing out of the water outlet pipe 20 flows through the hose to the first water outlet pipe 18 for discharge. At this time, not only the coolant in the lower chamber circulates, but the coolant in the upper chamber also circulates. The circulating coolant in the upper chamber will take away the heat on the heat conduction plate 37.

[0040] Nano-scale grooves are machined on the surfaces of the first heat-conducting rod 22 and the second heat-conducting rod 23. The nano-scale grooves on the second heat-conducting rod 23 use the capillary effect to guide the rapid diffusion of the condensate, and the nano-scale grooves on the first heat-conducting rod 22 increase the contact area with the paraffin, thereby achieving the purpose of enhancing the evaporative heat dissipation efficiency.

[0041] The expansion mechanism 33 includes a hollow heat-conducting rod 35 fixedly mounted on the second heat-conducting rod 23 , on which a plurality of umbrella rib blocking plates 34 are rotatably mounted, and an opening and closing structure cooperating with the umbrella rib blocking plates 34 is installed between the plurality of telescopic rods 47 and the annular water tank 16 .

[0042] The opening and closing structure includes a sliding rod 31 fixedly mounted on the telescopic end of the telescopic rod 47, each sliding rod 31 passes through the corresponding fixed end of the telescopic rod 47, and a hollow sliding ring 28 is fixedly mounted on the multiple sliding rods 31. Multiple groups of connecting rod groups are installed on the hollow sliding ring 28, and each group of connecting rod groups is composed of multiple connecting rods 36. Each connecting rod 36 is rotatably connected to the hollow sliding ring 28, and each connecting rod 36 is rotatably connected to the corresponding umbrella rib blocking plate 34 at one end away from the hollow sliding ring 28. A trapezoidal sealing plug 30 that matches the water guide hole is fixedly mounted on one of the sliding rods 31.

[0043] The angle between each connecting rod 36 and the corresponding umbrella rib blocking plate 34 is set between thirty degrees and forty-five degrees. This angle design is to ensure that the movement of the connecting rod 36 can drive the umbrella rib blocking plate 34 to rotate.

[0044] As the telescopic end of the telescopic rod 47 moves upward, the sliding rod 31 fixedly connected thereto will be driven to move upward. The upward movement of the sliding rod 31 will drive the hollow sliding ring 28 to move upward, thereby driving the umbrella rib blocking plate 34 to rotate through the connecting rod 36, so that the hollow heat-conducting rod 35 on the second heat-conducting rod 23 is exposed. At this time, the coolant in the lower chamber will pass through the hollow part inside the hollow heat-conducting rod 35, increasing the contact area and accelerating the cooling efficiency.

[0045] The function of the trapezoidal sealing plug 30 used here is: as the paraffin melts, the volume of the paraffin in the annular heat conduction box 17 gradually increases, and at this time the trapezoidal sealing plug 30 will gradually move upward. During the upward movement, due to its trapezoidal design, the sealing plug 30 is always located in the water guide hole to seal the water guide hole until the paraffin is almost completely melted. At this time, the volume of the paraffin is about to reach its maximum, the sealing plug 30 is separated from the water guide hole, the water guide hole is opened, and the coolant not only circulates through the lower chamber, but also enters the upper chamber through the water guide hole for circulation.

[0046] Example 2: This example differs from the example 1 in that: Figures 1-6 The laser welding head 3 is equipped with a cooling circulation mechanism that cooperates with the heat conduction mechanism 15.

[0047] The cooling circulation mechanism includes a pump 8 fixedly mounted on the laser welding head 3, on which a coolant storage tank 7 is fixedly mounted. The coolant circulates between the pump 8 and the first water outlet pipe 18 and the water inlet pipe 19 through a circulation pipeline 10. A cooler 11 is installed on the circulation pipeline 10 to accelerate the cooling of the coolant in the circulation pipeline 10.

[0048] After the paraffin is half melted, it enters the secondary cooling stage. At this time, the pump 8 is started, and the pump 8 inputs the coolant in the coolant storage tank 7 into the lower chamber of the annular water tank 16 through the water inlet pipe 19, so that the coolant circulates in the lower chamber. When the paraffin is completely melted, the coolant not only circulates through the lower chamber, but also enters the upper chamber through the water guide hole, circulates in the upper chamber under the action of the spiral plate 29, and then flows out from the second water outlet pipe 20.

[0049] The cooler 11 is an existing device and can be considered to have a refrigeration effect. The purpose of adding the cooler 11 to the circulation pipeline 10 is to make the coolant flow in at a low temperature before entering the lower cavity of the annular water tank 16, thereby improving the cooling efficiency.

[0050] The specific operating steps of this device are as follows: Low-heat cooling: At this time, the paraffin wax is less than half melted, and the heat on the second annular heat conducting plate 26 is transferred to the annular heat conducting box 17 through the first heat conducting rod 22. The solid paraffin wax in the annular heat conducting box 17 absorbs the heat from the first heat conducting rod 22 to melt the paraffin wax. Medium heat cooling: At this time, the paraffin is half melted and enters the secondary cooling stage. The second heat conducting rod 23 will bring the heat in the paraffin to the annular water tank 16. At this time, the pump 8 starts and inputs the coolant in the coolant storage tank 7 into the lower chamber of the annular water tank 16 through the water inlet pipe 19. The coolant circulates in the lower chamber and then flows out from the first water outlet pipe 18. At this time, the coolant circulation will take away the heat on the second heat conducting rod 23. High-temperature cooling: At this time, the paraffin is completely melted and its volume reaches its maximum, pushing the piston ring 41 upward. The piston ring 41 drives the support 45 upward, thereby driving the telescopic end of the telescopic rod 47 to extend. The first pressing head 32 of the telescopic end of the telescopic rod 47 presses the second pressing head on the push rod 44, causing the push rod 44 to slide on the fixed column 43 toward the side close to the connecting ring 25, thereby driving the arc-shaped heat conducting plate 38 to move toward the side close to the connecting ring 25 until the arc-shaped heat conducting plate 38 is in contact with the connecting ring 25. As the telescopic end of the telescopic rod 47 moves upward, the sliding rod 31 fixed thereto will be driven to move upward, and the sliding rod 31 will drive the sealing plug 30 to move upward so that the sealing plug 30 is separated from the water guide hole. The upward movement of the sliding rod 31 will drive the hollow sliding ring 28 to move upward, thereby driving the umbrella rib sealing plate 34 to rotate through the connecting rod 36, so that the hollow heat-conducting rod 35 on the second heat-conducting rod 23 is exposed. At this time, the coolant in the lower chamber will pass through the hollow part inside the hollow heat-conducting rod 35, increasing the contact area and accelerating the cooling efficiency. Part of the coolant in the annular water tank 16 circulates in the lower chamber, and the other part enters the upper chamber through the water guide hole, and then flows in a spiral shape in the upper chamber under the action of the spiral plate 29, and then flows out from the second water outlet pipe 20. The coolant flowing out of the water outlet pipe 20 will flow through the hose to the first water outlet pipe 18 for discharge. At this time, not only the coolant in the lower chamber circulates, but the coolant in the upper chamber also circulates. The circulating coolant in the upper chamber will take away the heat from the heat conduction plate 37.

[0051] The above merely provides the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto. Any person skilled in the art, according to the technical range disclosed by the present application and the inventive concept thereof, can make equivalent replacements or changes, and all these should be covered in the protection scope of the present application.

Claims

1. A laser welding cooling device, comprising a laser welding hood (1) and a welding base (2), characterized in that: Also included is a laser welding head (3) mounted inside the laser welding machine cover (1); The laser welding head (3) is composed of a laser emitting head (6), a laser generator (9), and a lens (13) fixedly mounted inside the laser emitting head (6) via a mounting frame (14); a heat conducting mechanism (15) matched with the mounting frame (14) is mounted on the laser welding head (3); and a cooling circulation mechanism matched with the heat conducting mechanism (15) is mounted on the laser welding head (3); The heat conduction mechanism (15) is composed of a first annular heat conduction plate (21), an annular heat conduction box (17), an annular water tank (16) divided into two upper and lower chambers by an annular partition (27), a plurality of first heat conduction rods (22) and a plurality of second heat conduction rods (23), each of the second heat conduction rods (23) is installed with an expansion mechanism (33), the second heat conduction rod (23) extends into the lower chamber of the annular water tank (16), the second annular heat conduction plate (26) conducts the heat on the mounting frame (14) to the annular heat conduction box (17) through the first heat conduction rod (22), and the annular heat conduction box (17) is filled with phase change material paraffin. The annular water tank (16) and the annular heat conduction box (17) are jointly installed with a plurality of auxiliary heat conduction structures (24) that cooperate with the mounting frame (14) to accelerate the heat dissipation speed.

2. The laser welding cooling device according to claim 1, characterized in that: The mounting frame (14) is composed of a connecting ring (25) and a second annular heat conducting plate (26); the connecting ring (25) is fixedly connected to the protective cover (12); the lens (13) is fixedly connected to the second annular heat conducting plate (26); and the second annular heat conducting plate (26) is fixedly connected to the connecting ring (25).

3. The laser welding cooling device according to claim 1, characterized in that: A protective gas injector (4) that matches the laser welding head (3) is fixedly mounted on the laser welding machine cover (1).

4. The laser welding cooling device according to claim 2, characterized in that: The auxiliary heat-conducting structure (24) comprises a fixed column (43) fixedly mounted on the annular water tank (16), and an arc-shaped heat-conducting plate (38) matched with the connecting ring (25) is mounted on the fixed column (43) via an elastic telescopic frame (46); A plurality of elastic telescopic rods (39) are fixedly mounted on the arc-shaped heat conducting plate (38), and a heat conducting plate (37) is fixedly mounted on one end of the plurality of elastic telescopic rods (39) away from the arc-shaped heat conducting plate (38). The heat conducting plate (37) passes through and extends into the upper chamber of the annular water tank (16). A movable component that cooperates with the arc-shaped heat conducting plate (38) is installed on the annular heat conducting box (17) and the annular water tank (16). The annular water tank (16) A spiral plate (29) is fixedly installed in the upper chamber, a baffle is fixedly installed in the lower chamber of the annular water tank (16), and a first water outlet pipe (18) and a water inlet pipe (19) are fixedly connected to both sides of the baffle. A water guide hole connecting the upper and lower chambers is opened on the annular partition (27), and a second water outlet pipe (20) connected to the upper chamber is fixedly connected on the annular water tank (16), and the second water outlet pipe (20) is connected to the first water outlet pipe (18) through a hose.

5. The laser welding cooling device according to claim 4, characterized in that: The movable component comprises a piston ring (41) slidably mounted inside the annular heat conducting box (17), a plurality of pillars (45) being fixedly mounted on the piston ring (41), each of the pillars (45) passing through and extending out of the annular heat conducting box (17) from above, a plurality of second permanent magnets (42) being fixedly mounted on the piston ring (41), and a plurality of first permanent magnets (40) matching corresponding second permanent magnets (42) being fixedly mounted on the top wall inside the annular heat conducting box (17); A pushing frame is fixedly mounted on each of the pillars (45), and a plurality of telescopic rods (47) are fixedly mounted on the top of the annular water tank (16). Each of the pushing frames is rotatably connected to the telescopic end of the corresponding telescopic rod (47), and a first pressure head (32) is fixedly mounted on the telescopic end of each telescopic rod (47). A push rod (44) is slidably mounted on the fixed column (43), and the push rod (44) is fixedly connected to the arc-shaped heat conducting plate (38). A second pressure head that matches the first pressure head (32) is fixedly mounted on the end of the push rod (44) away from the arc-shaped heat conducting plate (38).

6. The laser welding cooling device according to claim 5, characterized in that: The expansion mechanism (33) comprises a hollow heat-conducting rod (35) fixedly mounted on the second heat-conducting rod (23), a plurality of umbrella rib blocking plates (34) being rotatably mounted on the hollow heat-conducting rod (35), and an opening and closing structure cooperating with the umbrella rib blocking plates (34) being mounted between the plurality of telescopic rods (47) and the annular water tank (16).

7. The laser welding cooling device according to claim 6, characterized in that: The opening and closing structure includes a sliding rod (31) fixedly mounted on the telescopic end of the telescopic rod (47), each of the sliding rods (31) passes through the fixed end of the corresponding telescopic rod (47), and a hollow sliding ring (28) is fixedly mounted on the plurality of sliding rods (31). The hollow sliding ring (28) is mounted with a plurality of linkage rod groups, each linkage rod group is composed of a plurality of linkage rods (36), each linkage rod (36) is rotationally connected to the hollow sliding ring (28), and one end of each linkage rod (36) away from the hollow sliding ring (28) is rotationally connected to the corresponding umbrella rib blocking plate (34), and a trapezoidal blocking plug (30) that matches the water guide hole is fixedly mounted on one of the sliding rods (31).

8. The laser welding cooling device according to claim 7, characterized in that: The included angle between each connecting rod (36) and the corresponding umbrella rib blocking plate (34) is set between thirty degrees and forty-five degrees.

9. The laser welding cooling device according to claim 4, characterized in that: The cooling circulation mechanism comprises a pump (8) fixedly mounted on the laser welding head (3), a coolant storage tank (7) fixedly mounted on the pump (8), a coolant circulation is achieved between the pump (8) and the first water outlet pipe (18) and the water inlet pipe (19) via a circulation pipeline (10), and a cooler (11) is installed on the circulation pipeline (10) to accelerate the cooling of the coolant in the circulation pipeline (10).

10. The laser welding cooling device according to claim 1, characterized in that: Nano-scale grooves are processed on the surfaces of the first heat-conducting rod (22) and the second heat-conducting rod (23). The nano-scale grooves on the second heat-conducting rod (23) utilize the capillary effect to guide the rapid diffusion of the condensate, and the nano-scale grooves on the first heat-conducting rod (22) increase the contact area with the paraffin, thereby achieving the purpose of enhancing the evaporative heat dissipation efficiency.

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