An inner hole laser cladding head and its cooling water circulation device

Abstract

The present invention relates to the field of laser cladding technology, and more particularly to an internal bore laser cladding head and its cooling water circulation device, comprising a water inlet pipe, a water outlet pipe, a connecting pipe, a reflector water cooling pipe, and a focusing mirror water cooling annular cavity disposed between the outer wall of a focusing lens barrel and the inner wall of a cladding head body; the water inlet pipe is connected to the focusing mirror water cooling annular cavity, the focusing mirror water cooling annular cavity is connected to one end of the reflector water cooling pipe via a connecting pipe, the other end of the reflector water cooling pipe is connected to the water outlet pipe, and the reflector water cooling pipe is disposed on the back side of the reflector. The present invention adds a focusing mirror water cooling annular cavity between the outer wall of the focusing lens barrel and the inner wall of the cladding head body, and adds a reflector water cooling pipe on the back side of the reflector. Through the continuous circulation of cooling water, the heat generated by the various components and optical elements of the cladding head during operation can be promptly removed, thereby effectively reducing the temperature of the cladding head and the optical elements, and extending the service life of the internal bore laser cladding head.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cladding, and in particular to an inner hole laser cladding head and a cooling water circulation device thereof. Background Art

[0002] With the recent development of high-power fiber laser technology, fiber lasers have excellent laser properties and high photoelectric conversion efficiency. The power of fiber lasers used in internal hole cladding processes has reached 1000 to 3000 watts. The components of high-power laser cladding heads inevitably generate heat. Cooling with circulating cooling water is a common method.

[0003] The cooling water pipe required for the cladding head of ordinary structure is designed outside the optical tube. Due to space limitations, the processing aperture of the laser cladding head is greater than 100 mm, and it is impossible to process the surface of small inner holes with a diameter of less than 100 mm. Therefore, it is necessary to design a cooling water circulation device for the inner hole laser cladding head with a small space occupied by the water and gas path to solve the problem of heating of the laser cladding head processing and optical devices in small diameter holes. Summary of the Invention

[0004] The purpose of the present invention is to provide an inner hole laser cladding head and its cooling water circulation device, which can effectively solve the problems of heating of optical elements and cladding heads during laser cladding processing in small diameter holes, and realize high-power laser cladding processing on the surface of inner holes with a diameter of less than 100 mm.

[0005] To achieve the above-mentioned objectives, the technical solution of the present invention is a cooling water circulation device for an internal hole laser cladding head, comprising a water inlet pipe, a water outlet pipe, a connecting pipe, a reflector water cooling pipe, and a focusing mirror water cooling annular cavity arranged between the outer wall of the focusing lens barrel and the inner wall of the cladding head body; one end of the water inlet pipe is connected to the focusing mirror water cooling annular cavity, the focusing mirror water cooling annular cavity is connected to one end of the reflector water cooling pipe through a connecting pipe, the other end of the reflector water cooling pipe is connected to one end of the water outlet pipe, and the reflector water cooling pipe is arranged on the back side of the reflector.

[0006] Furthermore, the water inlet pipeline is communicated with an end of the focusing mirror water-cooling annular cavity away from the reflector, and an end of the focusing mirror water-cooling annular cavity close to the reflector is communicated with the connecting pipeline.

[0007] Furthermore, the reflector water cooling pipeline includes an inner tube section arranged in the reflector tube and an outer tube section arranged outside the reflector tube and located on both sides of the inner tube section, and the two ends of the inner tube section are respectively connected to the connecting pipeline and the water outlet pipeline through the outer tube sections on both sides.

[0008] Furthermore, the inner section of the barrel is U-shaped, and the bottom of the U-shape is close to the back side of the reflector.

[0009] Furthermore, a water inlet joint is provided at the other end of the water inlet pipe, and a water outlet joint is provided at the other end of the water outlet pipe.

[0010] The present invention also provides an internal hole laser cladding head, comprising a reflector assembly, a cladding head, a connecting rod and a cooling water pipe access device connected in sequence, and also comprising the above-mentioned cooling water circulation device, the cladding head comprising a cladding head body and a focusing lens barrel and a focusing lens arranged in the inner hole of the cladding head body, a closed water-cooled annular cavity for the focusing lens is formed between the outer wall of the focusing lens barrel and the inner wall of the cladding head body, the reflector water-cooling pipe is arranged in the reflector assembly, the connecting pipe is arranged in the cladding head body, the other end of the water inlet pipe and the other end of the water outlet pipe respectively pass through the connecting rod and extend to the cooling water pipe access device.

[0011] Furthermore, the connecting rod includes a first connecting rod and a second connecting rod, the cladding head, the first connecting rod, the second connecting rod and the cooling water pipe access device are connected in sequence, the cladding head, the first connecting rod, the second connecting rod and the water inlet pipe and the water outlet pipe in the cooling water pipe access device are correspondingly connected, and sealing rings are provided at the pipe joints.

[0012] Furthermore, the cooling water pipeline access device includes a pipeline ring, a water inlet joint and a water outlet joint, the water inlet joint and the water outlet joint are fixed on the outer wall of the pipeline ring, and the water inlet joint and the water outlet joint are respectively connected to the water inlet pipeline and the water outlet pipeline in the pipeline ring.

[0013] Furthermore, the reflector assembly includes a reflector seat, a reflector and a reflector barrel. The reflector seat is fixedly connected to the front end of the cladding head. A reflector is provided at one end of the reflector barrel. The other end of the reflector barrel is fixed to the reflector seat. The outer section of the reflector water cooling pipeline is provided in the reflector seat.

[0014] Furthermore, the cladding head body is provided with a temperature detector for detecting the temperature inside the cladding head body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention adds a focusing mirror water-cooling annular cavity between the outer wall of the focusing lens barrel and the inner wall of the cladding head body, and adds a reflecting mirror water-cooling pipeline on the back side of the reflecting mirror. Through the continuous circulation of cooling water, the heat generated by the various components of the cladding head and the optical elements during operation can be promptly taken away, which can effectively reduce the temperature of the cladding head and the optical elements and improve the service life of the inner hole laser cladding head;

[0017] (2) The cooling water circulation pipeline in the internal hole laser cladding head of the present invention adopts a hidden structure, which is entirely designed inside the cooling water pipeline access device, connecting rod, cladding head, and reflector assembly. The simple and compact structure greatly compresses the outer diameter of the cladding head and the connecting rod, which is conducive to laser cladding processing of smaller and deeper holes, and realizes high-power laser cladding processing of internal hole surfaces with a diameter of less than 100 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A three-dimensional diagram of an inner hole laser cladding head provided in the second embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of an inner hole laser cladding head provided in the second embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of a cooling water circulation device for an inner hole laser cladding head provided in Example 1 of the present invention;

[0022] Figure 4 A partially enlarged schematic diagram of a cooling water circulation device for an inner hole laser cladding head provided in Example 1 of the present invention;

[0023] In the figure: 1. Reflector assembly; 101. Reflector mount; 102. Reflector; 103. Reflector barrel; 2. Cladding head; 201. Cladding head body; 202. Focusing barrel; 203. Focusing lens; 3. First connecting rod; 4. Second connecting rod; 5. Cooling water pipe access device; 501. Pipe ring; 502. Water inlet connector; 503. Water outlet connector; 6. Temperature detector; 7. Sealing ring; 8. Water inlet pipe; 9. Focusing lens water-cooling annular cavity; 10. Connecting pipe; 11. Reflector water-cooling pipe; 12. Water outlet pipe; 13. Optical path. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1

[0026] like Figure 3 As shown, this embodiment provides a cooling water circulation device for an internal hole laser cladding head, comprising a water inlet pipe 8, a water outlet pipe 12, a connecting pipe 10, a reflector water cooling pipe 11, and a focusing mirror water cooling annular cavity 9 provided between the outer wall of the focusing lens barrel 202 and the inner wall of the cladding head body 201; one end of the water inlet pipe 8 is connected to the focusing mirror water cooling annular cavity 9, the focusing mirror water cooling annular cavity 9 is connected to one end of the reflector water cooling pipe 11 through the connecting pipe 10, the other end of the reflector water cooling pipe 11 is connected to one end of the water outlet pipe 12, and the reflector water cooling pipe 11 is provided on the back side of the reflector 102.

[0027] In this embodiment, a focusing lens water-cooling annular cavity 9 is added between the outer wall of the focusing lens barrel 202 and the inner wall of the cladding head body 201, and a reflecting mirror water-cooling pipeline 11 is added on the back side of the reflecting mirror 102. Through the continuous circulation of cooling water, the heat generated by the various components and optical elements of the cladding head during operation can be promptly removed, which can effectively reduce the temperature of the cladding head and optical elements and extend the service life of the inner hole laser cladding head.

[0028] Furthermore, the water inlet pipe 8 is connected to the end of the focusing mirror water-cooling annular cavity 9 away from the reflector 102, and the end of the focusing mirror water-cooling annular cavity 9 close to the reflector 102 is connected to the connecting pipe 10, so that the cooling water can fully exchange heat with the focusing lens barrel 202, thereby improving the cooling effect.

[0029] Furthermore, the reflector water cooling pipeline 11 includes an inner section arranged in the reflector barrel 103 and outer sections arranged outside the reflector barrel 103 and located on both sides of the inner section, and the two ends of the inner section are connected to the connecting pipeline 10 and the water outlet pipeline 12 through the outer sections on both sides. Figure 4 As shown, the inner section of the tube is U-shaped, and the two sides of the U-shape are close to the side walls of the reflector tube 103, and the bottom of the U-shape is close to the back side of the reflector 102, so that the reflector water cooling pipeline 11 is longer and closer to the heating part of the reflector 102, thereby improving the cooling effect.

[0030] Furthermore, a water inlet joint 502 is provided at the other end of the water inlet pipe 8, and a water outlet joint 503 is provided at the other end of the water outlet pipe 12. When in use, the water inlet joint 502 and the water outlet joint 503 are respectively connected to the output water pipe and the input water pipe of the external chiller to provide cooling water for the cooling water circulation device of this embodiment, and the water after absorbing heat is re-cooled and recycled.

[0031] Example 2

[0032] like Figure 1-Figure 3As shown, this embodiment provides an internal hole laser cladding head, comprising a reflector assembly 1, a cladding head 2, a connecting rod, and a cooling water pipe access device 5 connected in sequence, and also comprising the cooling water circulation device described in Example 1. The cladding head 2 comprises a cladding head body 201, a focusing lens barrel 202, and a focusing lens 203. The focusing lens barrel 202 is fixed to the inner hole of the cladding head body 201 in a coaxial manner with threads. The focusing lens 203 is fixedly mounted on the rear end of the focusing lens barrel 202. A closed focusing lens water-cooling annular cavity 9 is formed between the outer wall of the focusing lens barrel 202 and the inner wall of the cladding head body 201. The reflector water-cooling pipe 11 is disposed in the reflector assembly 1, and the connecting pipe 10 is disposed in the cladding head body 201. The other ends of the water inlet pipe 8 and the other ends of the water outlet pipe 12 respectively pass through the connecting rod and extend to the cooling water pipe access device 5.

[0033] In this embodiment, the water inlet pipe 8 sequentially passes through the cooling water pipe access device 5, the connecting rod, the cladding head 2, and the reflector assembly 1. The water outlet pipe 12 sequentially passes through the reflector assembly 1, the cladding head 2, the connecting rod, and the cooling water pipe access device 5. The cooling water required for cooling the laser light path 13 is connected to the water inlet pipe in the cooling water pipe access device 5. The cooling water passes through the connecting rod and the cladding head 2 to the focusing mirror water-cooling annular cavity 9 to cool the heating part of the focusing mirror 203 and the cladding head body 201. Then, it passes through the connecting pipe 10 to the reflector water-cooling pipe 11 to cool the heating part of the reflector 102. Then, it passes through the water outlet pipe 12 through the cladding head 2 and the connecting rod to return to the cooling water pipe access device 5 and is discharged. By adding a focusing mirror water-cooling annular cavity 9 and a reflecting mirror water-cooling pipeline 11, heat exchange can be directly performed on the heat dissipation parts of the focusing mirror 203 and the heat dissipation parts of the reflecting mirror 102 respectively, which can greatly improve the heat dissipation efficiency of the cladding head and optical elements, and effectively solve the problems of heat generation of optical elements and cladding heads during laser cladding processing in small-diameter holes. In addition, the cooling water circulation pipeline adopts a hidden structure and is entirely designed inside the cooling water pipeline access device 5, connecting rod, cladding head 2, and reflector assembly 1. The simple and compact structure greatly compresses the outer diameter of the cladding head 2 and the connecting rod, which is conducive to laser cladding processing of smaller and deeper holes, and realizes high-power laser cladding processing on the surface of inner holes with a diameter of less than 100 mm.

[0034] Furthermore, the connecting rod includes a first connecting rod 3 and a second connecting rod 4, the cladding head 2, the first connecting rod 3, the second connecting rod 4 and the cooling water pipe access device 5 are connected in sequence, the cladding head body 201, the first connecting rod 3, the second connecting rod 4 and the cooling water pipe access device 5 are all provided with a circular hole in the center and are coaxially arranged, the circular hole is an optical path 13 channel, the side wall is provided with the water inlet pipe 8 and the water outlet pipe 12, and the cladding head body 201, the first connecting rod 3, the second connecting rod 4 and the cooling water pipe access device 5 The water inlet pipe 8 is connected in sequence, the cladding head 2, the first connecting rod 3, the second connecting rod 4 and the cooling water pipe access device 5 The water outlet pipe 12 is connected in sequence, and the pipe joints of the water inlet pipe 8 and the pipe joints of the water outlet pipe 12 are provided with sealing rings 7 for sealing the pipe joints to form a sealed waterway to prevent cold water leakage. The distance between the cladding head 2 and the pipeline ring 501 is extended by the first connecting rod 3 and the second connecting rod 4. The length of the connecting rod can be configured according to the depth of the machined hole.

[0035] Furthermore, the cooling water pipe access device 5 includes a pipe ring 501, a water inlet connector 502, and a water outlet connector 503. The center of the pipe ring 501 is provided with a circular hole as a passage for the optical path 13. One end of the pipe ring 501 is connected to the second connecting rod 4, and the end face of the other end is the mounting surface of the internal hole laser cladding head, which can be used in conjunction with other optical head components. The water inlet connector 502 and the water outlet connector 503 are fixed to the outer wall of the pipe ring 501 by threads, and the water inlet connector 502 and the water outlet connector 503 are respectively connected to the water inlet pipe 8 and the water outlet pipe 12 in the pipe ring 501. In this embodiment, the water inlet pipe 8 and the water outlet pipe 12 in the pipe ring 501 are connected to the water inlet connector 502 and the water outlet connector 503 respectively after being turned.

[0036] Furthermore, the reflector assembly 1 includes a reflector seat 101, a reflector 102 and a reflector barrel 103. The reflector seat 101 is fixedly connected to the front end of the cladding head 2. The reflector barrel 103 is provided with a reflector 102 at one end. The reflector 102 is used to turn the direction of the laser to ensure that the laser is vertically irradiated to the surface of the workpiece. The other end of the reflector barrel 103 is fixed on the reflector seat 101. The outer section of the reflector water-cooling pipeline 11 is arranged in the reflector seat 101, and the inner section of the reflector water-cooling pipeline 11 is arranged in the reflector barrel 103.

[0037] Furthermore, the cladding head body 201 is provided with a temperature detector 6 for detecting the temperature inside the cladding head body 201 and transmitting the detected temperature to the system. When the temperature of the cladding head 2 is abnormal, the system will issue a warning to stop processing.

[0038] The reflector seat 101, the cladding head body 201, the first connecting rod 3, the second connecting rod 4 and the pipeline ring 501 of this embodiment are connected by screws and are locked to maintain a fixed position.

[0039] When performing laser inner hole cladding processing, the cladding head 2, the first connecting rod 3 and the second connecting rod 4 will extend into the deep hole, while the pipe ring 501 will remain outside the deep hole, so the shape of the pipe ring 501 is not restricted by space. When in use, the output water pipe and the input water pipe of the external chiller are connected to the water inlet joint 502 and the water outlet joint 503 respectively. The circulation process of the cooling water is as follows: the cooling water enters the sealed water circuit through the water inlet joint 502, passes through the pipe ring 501, the second connecting rod 4, and the water inlet pipe 8 in the first connecting rod 3 to reach the water inlet pipe 8 in the cladding head body 201, and then enters the focusing lens water-cooling annular cavity 9 between the outer wall of the focusing lens barrel 202 and the inner wall of the cladding head body 201; the cooling water absorbs the focusing lens and the cooling water flows into the focusing lens. After absorbing the heat from the lens barrel 202 and the cladding head body 201, the cooling water exits the other side of the focusing lens water-cooling annular cavity 9 and enters the reflector water-cooling pipe 11 on the back side of the reflector 102 through the connecting pipe 10. After absorbing the heat from the reflector 102, the cooling water enters the water outlet pipe 12 within the cladding head body 201. The cooling water then flows through the first connecting rod 3, the second connecting rod 4, and the water outlet pipe 12 in the pipe ring 501, returning to the water outlet connector 503 on the pipe ring 501, completing a cooling water cycle. This embodiment achieves the purpose of cooling the various components and optical elements of the laser cladding head through the continuous circulation of cooling water.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An inner hole laser cladding head, characterized by: The invention comprises a reflector assembly, a cladding head, a connecting rod and a cooling water pipe access device connected in sequence, and also comprises a cooling water circulation device, wherein the cooling water circulation device comprises a water inlet pipe, a water outlet pipe, a connecting pipe, a reflector water cooling pipe and a focusing mirror water cooling annular cavity; one end of the water inlet pipe is connected to the focusing mirror water cooling annular cavity, the focusing mirror water cooling annular cavity is connected to one end of the reflector water cooling pipe through a connecting pipe, the other end of the reflector water cooling pipe is connected to one end of the water outlet pipe, and the reflector The mirror water-cooling pipeline is arranged on the back side of the reflector; the cladding head includes a cladding head body and a focusing lens barrel and a focusing lens arranged in the inner hole of the cladding head body, and a closed focusing lens water-cooling annular cavity is formed between the outer wall of the focusing lens barrel and the inner wall of the cladding head body. The reflector water-cooling pipeline is arranged in the reflector assembly, and the connecting pipeline is arranged in the cladding head body. The other end of the water inlet pipeline and the other end of the water outlet pipeline respectively pass through the connecting rod and extend to the cooling water pipeline access device.

2. The inner hole laser cladding head according to claim 1, characterized in that: The water inlet pipeline is communicated with an end of the focusing mirror water-cooling annular cavity away from the reflector, and an end of the focusing mirror water-cooling annular cavity close to the reflector is communicated with the connecting pipeline.

3. The inner hole laser cladding head according to claim 1, characterized in that: The reflector water cooling pipeline includes an inner tube section arranged in the reflector tube and an outer tube section arranged outside the reflector tube and located on both sides of the inner tube section, and the two ends of the inner tube section are respectively connected to the connecting pipeline and the water outlet pipeline through the outer tube sections on both sides.

4. The inner hole laser cladding head according to claim 3, characterized in that: The inner section of the cylinder is U-shaped, and the bottom of the U-shape is close to the back side of the reflector.

5. The inner hole laser cladding head according to claim 1, characterized in that: The other end of the water inlet pipe is provided with a water inlet joint, and the other end of the water outlet pipe is provided with a water outlet joint.

6. The inner hole laser cladding head according to claim 1, characterized in that: The connecting rod includes a first connecting rod and a second connecting rod. The cladding head, the first connecting rod, the second connecting rod and the cooling water pipeline access device are connected in sequence. The cladding head, the first connecting rod, the second connecting rod and the water inlet pipeline and the water outlet pipeline in the cooling water pipeline access device are correspondingly connected, and sealing rings are provided at the pipeline joints.

7. The inner hole laser cladding head according to claim 6, characterized in that: The cooling water pipeline access device includes a pipeline ring, a water inlet joint and a water outlet joint. The water inlet joint and the water outlet joint are fixed on the outer wall of the pipeline ring, and the water inlet joint and the water outlet joint are respectively connected to the water inlet pipeline and the water outlet pipeline in the pipeline ring.

8. The inner hole laser cladding head according to claim 1, characterized in that: The reflector assembly includes a reflector seat, a reflector and a reflector barrel. The reflector seat is fixedly connected to the front end of the cladding head. A reflector is provided at one end of the reflector barrel. The other end of the reflector barrel is fixed to the reflector seat. The outer barrel section of the reflector water cooling pipeline is provided in the reflector seat.

9. The inner hole laser cladding head according to claim 1, characterized in that: The cladding head body is provided with a temperature detector for detecting the temperature inside the cladding head body.

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