Laser drilling device capable of recycling waste gas and using method of laser drilling device

Abstract

The invention relates to the technical field of laser drilling, and provides a laser drilling device capable of recycling waste gas and a using method thereof.The laser drilling device comprises a pulse output end of a laser and a protection box, the protection box covers a workbench at the pulse output end to enable the pulse output end to be in a sealed state, and the protection box can be opened; an air circulation filtering device is further arranged and connected with the protection box, the air circulation filtering device comprises a filtering box located outside the protection box, an air inlet pipe for conveying waste gas is arranged between the filtering box and the protection box, the other end of the filtering box is connected with an air outlet pipe, a draught fan used for controlling flowing of airflow is installed in the air inlet pipe, and the air outlet pipe is connected with an air outlet pipe. Waste gas in the protection box is filtered through the air circulation filtering device, and external air is prevented from being polluted.

Description

Technical Field

[0001] The present invention relates to the technical field of laser drilling, and in particular to a laser drilling device capable of recovering waste gas and a method of using the same. Background Art

[0002] Film cooling holes are an important process in aero-engine manufacturing, which is directly related to the performance and reliability of the engine. Purpose of drilling: The main purpose of film cooling holes is to realize film cooling technology. By processing tiny holes on the blades, high-speed airflow is ejected, forming a layer of air film on the surface of the blades, effectively reducing the temperature of the blades and protecting the blades from high temperature. Technical advantages: Laser drilling technology has significant advantages. It has a fast processing speed, which is 10 to 1000 times that of traditional mechanical equipment, greatly improving production efficiency. At the same time, laser drilling is not affected by material properties, and can process almost any material to achieve deformation-free hole drilling. Laser drilling requires a femtosecond laser, which is a laser device with extremely high time resolution. Its pulse duration reaches the femtosecond level, that is, 1e-15 seconds, which means that in such a short time, light can only travel a very short distance, less than one hundredth of a hair. Femtosecond lasers use mode-locking technology to generate ultrashort pulses of light. These pulses have extremely high peak power, wide spectral width, and extremely short laser emission time. Femtosecond lasers can be used for micro-processing, such as processing tiny parts, marking, cutting, etc. They can also be used to manufacture solar cells, LED lights, etc. In addition, femtosecond lasers are also important scientific research tools that can be used to detect the reaction process of molecules during chemical reactions and to study the nanostructure of semiconductors.

[0003] Femtosecond lasers are used to quickly and efficiently drill holes in parts. Existing femtosecond lasers produce some harmful gases and particles due to the high temperature when drilling, and most of them do not have gas filtering devices. Direct emissions will cause environmental pollution and are not conducive to the health and safety of users.

[0004] Therefore, it is necessary to redesign the femtosecond laser to effectively prevent the existing femtosecond laser from producing some harmful gases and particles due to high temperature when drilling. Most of them do not have gas filtering devices, and direct emissions will cause environmental pollution, which is not conducive to the health and safety of users. Summary of the invention

[0005] In view of the above defects, the present invention provides a laser drilling device, which can avoid air pollution caused by drilling. The specific scheme is as follows: A laser drilling device capable of recovering waste gas comprises a pulse output end of a laser and a protective box, wherein the protective box is covered on a workbench at the pulse output end so that the pulse output end is in a sealed state and the protective box can be opened, and is also provided with an air circulation filter device, the air circulation filter device is connected to the protective box and comprises a filter box located outside the protective box, an air inlet pipe for conveying waste gas is arranged between the filter box and the protective box, and a fan for promoting the circulation of airflow is installed in the air inlet pipe.

[0006] Furthermore, the air inlet pipe includes a first pipeline and a second pipeline, the first pipeline is connected between the fan and the protection box, the second pipeline is connected between the fan and the filter box, a first regulating valve is installed on the first pipeline, and a second regulating valve is installed on the air outlet pipe.

[0007] Furthermore, the two ends of the filter box are respectively provided with an air inlet hole connected to the air inlet pipe and an air outlet hole connected to the air outlet pipe, and a plurality of slots arranged in sequence are provided between the air inlet hole and the air outlet hole, and filter screens are respectively inserted into the plurality of slots; a filter cover that can be opened and closed is provided on the side wall of the filter box corresponding to the insertion direction of the slot.

[0008] Furthermore, the filter screen includes an outer frame plugged into the slot, a filter element is arranged in the outer frame, and the filter elements of the multiple filter screens are fiber filter cotton, HEPA filter cloth, activated carbon plate and collecting bag, and the collecting bag is located at the air outlet.

[0009] Furthermore, an elastic element is provided on the insertion end surface of the outer frame to react thereon and push it outward, and the elastic element is a spring sheet.

[0010] Furthermore, an air intake fan for balancing the air pressure is installed on the protection box.

[0011] Furthermore, a gas concentration sensor is installed on the second pipeline.

[0012] Furthermore, a flexible sleeve is provided on one side of the protective box and is sleeved with the pulse output end. The flexible sleeve can be stretched along with the movement of the pulse output end. The flexible sleeve is a latex tube, and a sealing ring is provided at the connection between the flexible sleeve and the pulse output end.

[0013] Furthermore, a bracket is provided, the laser and the protection box are installed on the top of the bracket, and the filter box is installed below the protection box.

[0014] Furthermore, a method for using a laser drilling device capable of recovering waste gas is provided, and the specific steps are as follows: S1. Open the protective box, place the workpiece to be punched on the workbench, and punch a hole in the workpiece through the pulse output end of the laser. The flexible sleeve can be stretched as the pulse output end moves, and exhaust gas leakage can be avoided. S2. Start the fan. After the fan rotates to pump the air inside the protection box into the filter box, close the first regulating valve and the second regulating valve. The fan controls the back and forth flow of the exhaust gas in the filter box by forward and reverse rotation, thereby filtering the exhaust gas repeatedly. When the gas concentration sensor detects that the particulate matter in the air reaches the safety standard, open the first regulating valve and the second regulating valve, and the fan discharges the filtered gas. At the same time, open the air intake fan to stabilize the air pressure in the protection box. S3. Open the filter cover on the filter box, and the frame elastically connected to the slot in the filter box is ejected, so that the filter elements of multiple filter screens can be quickly replaced for next use.

[0015] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention filters the exhaust gas in the protective box through the air circulation filter device, thereby preventing the external air from being polluted; 2. The present invention pumps the air inside the protection box to the inside of the filter box through the rotation of the fan, closes the first regulating valve and the second regulating valve, and controls the back and forth flow of the exhaust gas in the filter box through forward and reverse rotation of the fan, thereby filtering the exhaust gas repeatedly. When the gas concentration sensor detects that the particulate matter in the air reaches the safety standard, the first regulating valve and the second regulating valve are opened, and the fan discharges the filtered gas. At the same time, the air intake fan is turned on to stabilize the air pressure in the protection box. The invention has the advantages of simple structure and easy and quick operation. 3. The filter box of the present invention is provided with multiple filter screens, and different filter elements are provided in the multiple filter screens, which has the advantage of good filtering effect; 4. In the present invention, the outer frame is elastically connected to the slot. After the filter cover is opened, the outer frame is pushed out of the slot through the spring sheet, which is convenient for quickly replacing a new filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the protection box of the present invention; Figure 3 It is a schematic diagram of the structure between the protection box and the filter box of the present invention; Figure 4 The present invention Figure 3 A partial enlarged structural diagram of the filter box; Figure 5 It is a schematic diagram of the elastic connection between the outer frame and the slot; Description of reference numerals: 1. Bracket; 2. Laser; 3. Pulse output terminal; 4. Protective box; 5. Flexible sleeve; 6. Cover plate; 7. Fan; 7-1. First pipeline; 7-2. Second pipeline; 7-3. Air outlet pipe; 8. First regulating valve; 9. Filter box; 10. Inlet fan; 11. Outer frame; 12. Collecting bag; 13. Activated carbon plate; 14. HEPA filter cloth; 15. Fiber filter cotton; 16. Shrapnel; 17. Slot. DETAILED DESCRIPTION

[0017] The technical solution of the invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments.

[0018] Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the invention.

[0019] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances. Example 1

[0021] like Figure 1As shown, a laser drilling device capable of recovering waste gas is shown, the laser drilling device is a femtosecond laser, the workpiece to be drilled is a turbine, and includes a pulse output end 3 of the laser 2 and a protective box 4, the protective box 4 is covered on the workbench at the pulse output end 3, so that the pulse output end 3 is in a sealed state, and the protective box 4 can be opened, and the side of the protective box 4 is provided with a cover plate 6 that can be opened, and an air circulation filter device is also provided, the air circulation filter device is connected to the protective box 4, including a filter box 9 located outside the protective box 4, an air inlet pipe for conveying waste gas is provided between the filter box 9 and the protective box 4, and the other end of the filter box 9 is connected to an air outlet pipe 7-3, and a fan 7 for controlling the flow of air is installed in the air inlet pipe. The protective box 4 is installed with an air intake fan 10 for balancing the air pressure.

[0022] like Figure 3 As shown, the air inlet pipe includes a first pipe 7-1 and a second pipe 7-2, the first pipe 7-1 is connected between the fan 7 and the protection box 4, the second pipe 7-2 is connected between the fan 7 and the filter box 9, the second pipe 7-2 is installed with a gas concentration sensor, the first pipe 7-1 is installed with a first regulating valve 8, and the air outlet pipe 7-3 is installed with a second regulating valve. The filter screen includes an outer frame 11 plugged into the slot 17, and a filter element is arranged in the outer frame 11. The filter elements of the multiple filter screens are fiber filter cotton 15, HEPA filter cloth 14, activated carbon plate 13 and collection bag 12, respectively, and the collection bag 12 is located at the air outlet. Example 2

[0023] like Figure 4 As shown, an elastic element is provided on the insertion end surface of the outer frame 11 to react thereon and push it outward, and the elastic element is a spring sheet 16. Example 3

[0024] like Figure 1 As shown, a bracket 1 is also provided, the laser 2 and the protection box 4 are installed on the top of the bracket 1, and the filter box 9 is installed below the protection box 4.

[0025] like Figure 2 As shown, a flexible sleeve 5 is provided on one side of the protective box 4 and is sleeved with the pulse output terminal 3. The flexible sleeve 5 can be stretched as the pulse output terminal 3 moves. The flexible sleeve 5 is a latex tube, and a sealing ring is provided at the connection between the flexible sleeve 5 and the pulse output terminal 3. Example 4

[0026] A method for using a laser drilling device capable of recovering waste gas, the specific steps are as follows: S1. By opening the protective box 4, the workpiece to be punched is placed on the workbench, and the workpiece is punched through the pulse output end 3 of the laser 2. The flexible sleeve 5 can be stretched along with the movement of the pulse output end 3, and exhaust gas leakage can be avoided; S2, start the fan 7, after the fan 7 rotates to pump the air inside the protection box 4 into the filter box 9, close the first regulating valve 8 and the second regulating valve, the fan 7 controls the back and forth flow of the exhaust gas in the filter box 9 by forward and reverse rotation, so as to filter the exhaust gas repeatedly, when the gas concentration sensor detects that the particulate matter in the air reaches the safety standard, open the first regulating valve 8 and the second regulating valve, the fan 7 discharges the filtered gas, and at the same time, open the air intake fan 10 to stabilize the air pressure in the protection box 4; S3, opening the filter cover on the filter box 9, the frame body in the filter box 9 elastically connected with the slot 17 is ejected, and the filter elements of the multiple filter screens are quickly replaced for next use.

[0027] like Figure 3 As shown, the two ends of the filter box 9 are respectively provided with an air inlet hole connected to the air inlet pipe and an air outlet hole connected to the air outlet pipe 7-3, and a plurality of slots 17 arranged in sequence are provided between the air inlet hole and the air outlet hole, and filter screens are respectively inserted into the plurality of slots 17; a filter cover that can be opened and closed is provided on the side wall of the filter box 9 corresponding to the insertion direction of the slot 17.

[0028] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A laser drilling device capable of recovering waste gas, comprising a pulse output end (3) of a laser (2) and a protective box (4), wherein the protective box (4) is covered on a workbench at the pulse output end (3) so that the pulse output end (3) is in a sealed state, and the protective box (4) can be opened, characterized in that: An air circulation filter device is also provided, which is connected to the protection box (4) and comprises a filter box (9) located outside the protection box (4), an air inlet pipe for conveying waste gas is provided between the filter box (9) and the protection box (4), the other end of the filter box (9) is connected to an air outlet pipe (7-3), and a fan (7) for controlling the flow of air is installed in the air inlet pipe.

2. The laser drilling device capable of recovering waste gas according to claim 1, characterized in that: The air inlet pipe comprises a first pipe (7-1) and a second pipe (7-2); the first pipe (7-1) is connected between the fan (7) and the protection box (4); the second pipe (7-2) is connected between the fan (7) and the filter box (9); a first regulating valve (8) is installed on the first pipe (7-1); and a second regulating valve is installed on the air outlet pipe (7-3).

3. The laser drilling device capable of recovering waste gas according to claim 2, characterized in that: An air inlet hole connected to the air inlet pipe and an air outlet hole connected to the air outlet pipe (7-3) are respectively provided at both ends of the filter box (9); a plurality of slots (17) arranged in sequence are provided between the air inlet hole and the air outlet hole; filter screens are respectively inserted into the plurality of slots (17); and a filter cover that can be opened and closed is provided on the side wall of the filter box (9) corresponding to the insertion direction of the slots (17).

4. The laser drilling device capable of recovering waste gas according to claim 3, characterized in that: The filter screen comprises an outer frame (11) plugged into a slot (17), a filter element is arranged in the outer frame (11), and the filter elements of the plurality of filter screens are fiber filter cotton (15), HEPA filter cloth (14), an activated carbon plate (13) and a collection bag (12), respectively, and the collection bag (12) is located at the air outlet.

5. The laser drilling device capable of recovering waste gas according to claim 4, characterized in that: An elastic element is provided on the insertion end surface of the outer frame (11) to react thereon and push it outwards, and the elastic element is a spring sheet (16).

6. The laser drilling device capable of recovering waste gas according to claim 2, characterized in that: An air intake fan (10) for balancing air pressure is installed on the protection box (4).

7. The laser drilling device capable of recovering waste gas according to claim 6, characterized in that: A gas concentration sensor is installed on the second pipeline (7-2).

8. The laser drilling device capable of recovering waste gas according to claim 1, characterized in that: A flexible sleeve (5) is provided on one side of the protection box (4) and is sleeved with the pulse output end (3). The flexible sleeve (5) can be stretched along with the movement of the pulse output end (3). The flexible sleeve (5) is a latex tube. A sealing ring is provided at the connection between the flexible sleeve (5) and the pulse output end (3).

9. The laser drilling device capable of recovering waste gas according to claim 1, characterized in that: A bracket (1) is also provided, the laser (2) and the protection box (4) are installed on the top of the bracket (1), and the filter box (9) is installed below the protection box (4).

10. The method for using the laser drilling device capable of recovering waste gas according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. By opening the protective box (4), a workpiece to be punched is placed on a workbench, and a hole is punched in the workpiece through the pulse output end (3) of the laser (2). The flexible sleeve (5) can be stretched along with the movement of the pulse output end (3), and exhaust gas leakage can be avoided. S2, start the fan (7), after the fan (7) rotates to pump the air inside the protection box (4) into the inside of the filter box (9), close the first regulating valve (8) and the second regulating valve, the fan (7) controls the back and forth flow of the exhaust gas in the filter box (9) by forward and reverse rotation, thereby filtering the exhaust gas repeatedly, when the gas concentration sensor detects that the particulate matter in the air reaches the safety standard, open the first regulating valve (8) and the second regulating valve, the fan (7) discharges the filtered gas, and at the same time, open the air intake fan (10) to stabilize the air pressure in the protection box (4); S3, the filter cover on the filter box (9) is opened, and the frame elastically connected to the slot (17) in the filter box (9) is ejected, and the filter elements of the multiple filter screens are quickly replaced for next use.

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