Handheld efficient multifunctional electric arc machining device

Abstract

The invention provides a handheld efficient multifunctional electric arc machining device, and relates to the technical field of electric arc machining, the handheld efficient multifunctional electric arc machining device comprises a handheld handle and a controller, the handheld handle is provided with a machining mechanism for electric arc machining, and the handheld handle is provided with a compensation mechanism for electrode compensation; the machining mechanism comprises a fixed shell, a splash guard, a movable column and an electric grinding wheel, the compensation mechanism comprises a servo motor and an infrared distance meter, the fixed shell is fixedly installed at the side end of the servo motor, and the splash guard is located at the lower end of the fixed shell. According to the device, the adjustable electric grinding wheel is arranged, the infrared distance meter drives the servo motor to achieve position adjustment of the electric grinding wheel, the automatic compensation function of the electrode is achieved, it is ensured that the electrode is located at the optimal machining position all the time, and the adjustment threshold value of electrode compensation of the electric grinding wheel can be accurately adjusted according to the real-time abrasion degree; and compared with manual adjustment, the method has accuracy and timeliness.

Description

Technical Field

[0001] The present invention belongs to the technical field of arc processing, and more specifically, relates to a handheld, efficient, and multifunctional arc processing device. Background Art

[0002] Handheld high-speed arc processing equipment is an efficient processing tool based on the principle of arc discharge and has portable operation characteristics. It mainly controls the high-frequency arc (temperature can reach thousands of degrees Celsius) generated between the electrode and the workpiece through a handheld operating handle to achieve rapid etching of metal materials.

[0003] The Chinese patent publication number is: CN103752989B. This invention combines three processing methods: high-speed arc, ultrasonic vibration and grinding. By combining the various processing methods, the material removal rate can be significantly improved. It is particularly suitable for on-site repair processing of the surface fatigue layer of large and immovable scrap mechanical parts.

[0004] Existing arc machining devices have the following problems: 1. Dynamic wear of handheld electrodes leads to unstable machining accuracy. Although handheld electrodes are not fixed, they will experience continuous wear due to arc discharge during high-speed arc machining, such as wear on the electrode end surface and shape distortion. Although the gap can be manually adjusted by handheld operation, the lag and randomness of manual operation make it difficult to accurately match the real-time wear rate of the electrode, which can easily lead to fluctuations in the discharge gap. If the electrode is not adjusted in time after wear, the gap may be too large (arc extinguished) or too small (electrode and workpiece short circuit), resulting in interruption of the machining process, deterioration of surface quality, deviation of machining dimensions, or uneven surface roughness. 2. Existing handheld devices rely on manual visual inspection or shutdown measurement to determine the degree of electrode wear. Traditional fixed electrode compensation technologies, such as servo motor-driven screw-nut mechanisms, are difficult to directly transplant to handheld devices. The real-time movement of handheld devices and electrode wear require compensation mechanisms with rapid perception and execution capabilities. Traditional mechanical structures are difficult to adapt to high-frequency position adjustment requirements and are prone to fatigue in handheld operations. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a handheld high-efficiency and multifunctional arc machining device to solve the above problems.

[0006] A handheld, efficient and multifunctional arc processing device comprises a handheld handle and a controller, the controller is integrated with an ultrasonic generator and a high-voltage pulse power supply, the handheld handle is provided with a processing mechanism for arc processing, the handheld handle is provided with a compensation mechanism for electrode compensation, the processing mechanism comprises a fixed shell, a splash shield, a movable column and an electric grinding wheel, the compensation mechanism comprises a servo motor and an infrared rangefinder, the fixed shell is fixedly mounted on the side end of the servo motor, the splash shield is located at the lower end of the fixed shell, the lower end of the fixed shell is fixedly mounted with a mounting block, the servo motor is located at the lower end of the mounting block, the movable column is located on the splash shield, and the infrared rangefinder is fixedly mounted on the inner side wall of the splash shield, the side end of the handheld handle is fixedly mounted with a wiring terminal, and the circumferential end of the handheld handle is fixedly mounted with a speed regulating knob. The lower end of the fixed shell is fixedly installed with a connecting column, a telescopic rod is fixedly installed between the servo motor and the mounting block, the circumferential end of the servo motor is fixedly installed with a terminal block, the output end of the servo motor is fixedly installed with a threaded rod, the upper end of the splash guard is penetrated by a first circular groove, the upper end of the splash guard is also penetrated by a second circular groove, the circumferential end of the inner wall of the splash guard is provided with an embedded groove, the side end of the embedded groove is fixedly installed with a glass protective plate, the movable column is slidably installed on the inner side wall of the second circular groove, the lower end of the movable column is fixedly installed with a brush, the infrared rangefinder is fixedly installed on the inner side wall of the embedded groove, the upper end of the splash guard is fixedly installed with a relay, a second connecting wire is fixedly installed between the infrared rangefinder and the relay, and a first connecting wire is fixedly installed between the infrared rangefinder and the terminal block.

[0007] Preferably, the electric grinding wheel is located on the inner wall of the splash guard, and a transmission shaft is fixedly installed on the upper end of the electric grinding wheel. The transmission shaft passes through the inner wall of the first circular groove, and is fixedly installed in a fixed shell. An annular plate is fixedly installed on the circumferential end of the transmission shaft.

[0008] Preferably, a side connecting rod is fixedly installed between the annular plate and the movable column, an ear plate is fixedly installed on the circumferential end of the annular plate, a threaded groove is opened through the upper end of the ear plate, and the threaded rod is threadedly installed on the inner wall of the threaded groove.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, an infrared rangefinder is provided on the inner wall of the embedded groove, and the wear of the electric grinding wheel can be detected by the infrared rangefinder. The infrared rangefinder can quickly capture the micron-level wear changes of the grinding wheel by virtue of high-frequency real-time monitoring. Its detection response is immediate, and compared with manual measurement, which is easily affected by subjective operation, low measurement frequency and environmental interference, infrared ranging can accurately control errors and stably output high-precision data through non-contact measurement and precise algorithm filtering.

[0010] In the present invention, a glass protective plate is provided at the side end of the embedded groove to protect the infrared rangefinder. This can not only effectively block the contaminants such as abrasive chips, coolant and dust splashed during the electric grinding wheel processing through physical isolation, and prevent them from directly impacting or adhering to the infrared rangefinder lens and sensor surface, thereby preventing measurement deviation or equipment failure caused by contamination of optical components, but also rely on the high light transmittance of the transparent material of the glass protective plate to ensure that the emission and reception of the infrared light beam are not significantly hindered, thereby maintaining the ranging accuracy, and has a good protective effect on the infrared rangefinder.

[0011] In the present invention, an adjustable electric grinding wheel is provided, and the position of the electric grinding wheel is adjusted by driving a servo motor through an infrared rangefinder, thereby realizing the automatic compensation function of the electrode, ensuring that the electrode is always in the optimal processing position, and the adjustment threshold of the electrode compensation of the electric grinding wheel can be accurately adjusted according to the real-time wear degree, which is more accurate and timely than manual adjustment, and continuously maintains the accuracy of the electric grinding wheel position and the quality of workpiece processing after automatic electrode compensation.

[0012] In the present invention, a telescopic rod is provided at the upper end of the servo motor, which allows the servo motor to move synchronously with the up and down movement of the electric grinding wheel, ensuring that the threaded rod and the thread groove at the output end of the servo motor always maintain precise engagement, avoiding overload, jamming or transmission failure problems caused by relative position changes, and ensuring the stability and reliability of the transmission system. At the same time, when the electric grinding wheel is dynamically adjusted, the servo motor can adapt to the displacement changes of the electric grinding wheel while driving the threaded rod to rotate to achieve position compensation of the electric grinding wheel, and is flexible to use.

[0013] In the present invention, a side connecting rod is provided between the annular plate and the movable column. When the electric grinding wheel moves up and down, the side connecting rod is driven to move through the annular plate. The movement of the side connecting rod drives the movable column to move. The movement of the movable column drives the brush to move synchronously with the position of the electric grinding wheel, avoiding the interference risk caused by lagging or leading movement of the brush, ensuring that the relative position of the brush and the electric grinding wheel always meets the electrical contact requirements during the movement, and ensuring the quality of its workpiece processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the controller of the present invention Figure 2 It is a structural schematic diagram of the handheld handle of the present invention; Figure 3 It is a structural schematic diagram of the fixed housing of the present invention; Figure 4 It is a schematic structural diagram of the splash guard of the present invention; Figure 5 It is a schematic structural diagram of the electric grinding wheel of the present invention; Figure 6 It is a structural schematic diagram of the servo motor of the present invention; Figure 7 It is a structural schematic diagram of the connecting column of the present invention; Figure 8 It is a structural schematic diagram of the infrared rangefinder of the present invention; Figure 9 It is a structural schematic diagram of the relay of the present invention.

[0015] In the figure, the correspondence between the component names and the drawing numbers is: 1. Handle; 11. Terminal; 12. Speed ​​control knob; 2. Fixed shell; 21. Connecting column; 22. Mounting block; 3. Servo motor; 31. Telescopic rod; 32. Terminal block; 33. Threaded rod; 4. Splash shield; 41. First circular groove; 42. Second circular groove; 43. Embedded groove; 45. Glass protection plate; 5. Movable column; 51. Brush; 6. Infrared rangefinder; 61. First connecting line; 62. Relay; 63. Second connecting line; 7. Electric grinding wheel; 71. Drive shaft; 72. Side connecting rod; 73. Ring plate; 74. Ear plate; 75. Threaded groove; 8. Controller. DETAILED DESCRIPTION

[0016] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0017] See also Figures 1-9The present invention provides a handheld, efficient and multifunctional arc processing device, comprising a handheld handle 1 and a controller 8, the controller 8 being integrated with an ultrasonic generator and a high-voltage pulse power supply, the handheld handle 1 being provided with a processing mechanism for arc processing, the handheld handle 1 being provided with a compensation mechanism for electrode compensation, the processing mechanism comprising a fixed shell 2, a splash shield 4, a movable column 5 and an electric grinding wheel 7, when the device is in use, the electric grinding wheel 7 and the workpiece are respectively connected to the two ends of the high-voltage pulse arc power supply, when the distance between the two electrodes is reduced to a level where the electric field intensity is large enough, spark discharge is generated between the two poles, thereby melting and boiling the electrode metal of the workpiece, and then the molten metal is removed under the action of external force to achieve processing of the workpiece, when in use, the handheld handle 1 is integrated with a motor, a coupling, a spindle and a connecting flange, the motor drives the spindle to rotate through the coupling, and the spindle then drives the variable speed drive shaft through the connecting flange The amplitude rod rotates to provide power for the equipment and realize motion transmission. An ultrasonic generator can be connected to the terminal 11. The amplitude rod passes through the splash shield 4 and is fixedly connected to the electric grinding wheel 7 and is insulated from each other. The ultrasonic generator is used to adjust the amplitude and vibration frequency parameters of the amplitude rod to control the size of the discharge gap and the length of the discharge time. The electric grinding wheel 7 is used as the tool electrode and is connected to the cathode of the arc processing control power supply through the brush 51. While performing high-speed arc discharge processing, the electric grinding wheel 7 also rotates with the amplitude rod as the axis, and is usually designed to be spherical crown-shaped to ensure that the working surface is consistent with the vibration direction of the amplitude rod, which is convenient for controlling the discharge gap and the cooling of the grinding wheel. A splash shield 4 is provided to protect the operator and the internal components of the equipment to prevent arc splashing and debris from entering. At the same time, a handheld handle 1 is provided to facilitate the operator's handheld operation to meet the needs of on-site processing; The compensation mechanism includes a servo motor 3 and an infrared rangefinder 6. The fixed housing 2 is fixedly mounted on the side end of the servo motor 3. The splash shield 4 is located at the lower end of the fixed housing 2. The lower end of the fixed housing 2 is fixedly mounted with a mounting block 22. The servo motor 3 is located at the lower end of the mounting block 22. The movable column 5 is located on the splash shield 4. The infrared rangefinder 6 is fixedly mounted on the inner side wall of the splash shield 4. The side end of the handheld handle 1 is fixedly mounted with a terminal 11. The circumferential end of the handheld handle 1 is fixedly mounted with a speed control knob 12. The lower end of the fixed housing 2 is fixedly mounted. A connecting column 21 is provided, a telescopic rod 31 is fixedly installed between the servo motor 3 and the mounting block 22, a terminal block 32 is fixedly installed on the circumferential end of the servo motor 3, a threaded rod 33 is fixedly installed on the output end of the servo motor 3, a first circular groove 41 is penetrated through the upper end of the splash shield 4, a second circular groove 42 is also penetrated through the upper end of the splash shield 4, an embedded groove 43 is provided on the circumferential end of the inner wall of the splash shield 4, a glass protective plate 45 is fixedly installed on the side end of the embedded groove 43, and the movable column 5 is slidably mounted on the inner wall of the second circular groove 42 , a brush 51 is fixedly installed at the lower end of the movable column 5, an infrared rangefinder 6 is fixedly installed on the inner side wall of the embedded groove 43, a relay 62 is fixedly installed on the upper end of the splash shield 4, a second connecting line 63 is fixedly installed between the infrared rangefinder 6 and the relay 62, and a first connecting line 61 is fixedly installed between the infrared rangefinder 6 and the terminal block 32. In actual use, the electric grinding wheel 7 will be worn out after long-term use. An infrared rangefinder 6 is provided on the inner side wall of the splash shield 4. By emitting an infrared beam, the measuring beam is reflected by the surface of the object to be measured. The time difference or phase difference returned after the electric grinding wheel 7 is used to calculate the distance between the measured object and the sensor. The electric grinding wheel 7 mainly manifests itself as a thinning of the thickness of the working surface (such as the outer circle or end face). Since the electric grinding wheel 7 is mostly spherical, the infrared rangefinder 6 will detect the wear of the electric grinding wheel 7 through an infrared beam. The wear threshold can be set. When the wear exceeds the threshold, the infrared rangefinder 6 will transmit a signal to the relay 62 through the second connecting line 63. After receiving the signal, the relay 62 will start the servo motor 3 through the first connecting line 61. The electric grinding wheel 7 is located on the inner side wall of the splash guard 4, and a transmission shaft 71 is fixedly installed on the upper end of the electric grinding wheel 7. The transmission shaft 71 penetrates and is installed on the inner side wall of the first circular groove 41. The transmission shaft 71 is fixedly installed in the fixed housing 2, and an annular plate 73 is fixedly installed on the circumferential end of the transmission shaft 71. A side connecting rod 72 is fixedly installed between the annular plate 73 and the movable column 5. A side connecting rod 72 is also provided between the annular plate 73 and the movable column 5. When the electric grinding wheel 7 moves up and down, the side connecting rod 72 is driven to move by the annular plate 73. The movement of the side connecting rod 72 drives the movable column 5 to move. The movement of the movable column 5 drives the brush 51 to move synchronously with the position of the electric grinding wheel 7, avoiding the interference risk caused by the lagging or leading movement of the brush 51, and ensuring that the relative position of the brush 51 and the electric grinding wheel 7 always meets the electrical contact requirements during the movement, thereby ensuring the quality of its workpiece processing; The circumferential end of the annular plate 73 is fixedly installed with an ear plate 74, and the upper end of the ear plate 74 is penetrated by a threaded groove 75, and the threaded rod 33 is threadedly installed on the inner side wall of the threaded groove 75. After the terminal block 32 on the servo motor 3 is started by receiving the signal of the relay 62, the servo motor 3 will drive the threaded rod 33 to rotate. The rotation of the threaded rod 33 will drive the ear plate 74 to move downward through the threaded groove 75. The downward movement of the ear plate 74 drives the annular plate 73 to move downward. The downward movement of the annular plate 73 will drive the transmission shaft 71 to move downward. The downward movement of the transmission shaft 71 will drive the electric grinding wheel 7 to move downward. Because a certain detection threshold is set on the infrared rangefinder 6, the servo motor 3 will also drive the threaded rod 33 to rotate according to the wear threshold. After the threaded rod 33 rotates and drives the electric grinding wheel 7 to a suitable position, it will stop rotating, thereby changing the position of the electric grinding wheel 7 to achieve motor compensation.

[0018] Working principle: In the first step, when the device is in use, the electric grinding wheel 7 and the workpiece are respectively connected to the two ends of the high-voltage pulse arc power supply. When the gap between the two electrodes is reduced to a point where the electric field strength is large enough, spark discharge is generated between the two electrodes, thereby melting and boiling the workpiece electrode metal, and then the molten metal is removed under the action of external force to achieve processing of the workpiece. When in use, the handheld handle 1 is integrated with a motor, a coupling, a spindle, and a connecting flange. The motor drives the spindle to rotate through the coupling, and the spindle then drives the amplitude rod to rotate through the connecting flange, providing power for the equipment and realizing motion transmission. An ultrasonic generator can be connected at the terminal 11, and the amplitude rod passes through the splash guard 4 and is fixedly connected to the electric grinding wheel 7 and is insulated from each other. The ultrasonic generator is used to adjust the amplitude and vibration frequency parameters of the amplitude converter to control the size of the discharge gap and the length of the discharge time. The electric grinding wheel 7 is used as the tool electrode and is connected to the cathode of the arc processing control power supply through the brush 51. The electric grinding wheel 7 rotates with the amplitude converter as the axis while performing high-speed arc discharge processing, and is usually designed to be spherical to ensure that the working surface is consistent with the vibration direction of the amplitude converter, which is convenient for controlling the discharge gap and the cooling of the grinding wheel. A splash guard 4 is provided to protect the operator and the internal components of the equipment to prevent arc splashing and debris from entering. At the same time, it is equipped with a handheld handle 1 to facilitate the operator's handheld operation to meet the needs of on-site processing.

[0019] In the second step, in actual use, the electric grinding wheel 7 will be worn out after long-term use. An infrared rangefinder 6 is set on the inner wall of the splash shield 4. By emitting an infrared light beam and measuring the time difference or phase difference of the light beam after being reflected by the surface of the object to be measured, the distance between the object to be measured and the sensor is calculated. The electric grinding wheel 7 mainly manifests as a thinning of the thickness of the working surface (such as the outer circle, end face). Since the electric grinding wheel 7 is mostly spherical, the infrared rangefinder 6 will detect the wear of the electric grinding wheel 7 through the infrared light beam. The wear threshold can be set. When it is detected that the wear exceeds the threshold, the infrared rangefinder 6 will transmit a signal to the relay 62 through the second connecting line 63. After receiving the signal, the relay 62 will start the servo motor 3 through the first connecting line 61; The device is provided with an infrared rangefinder 6 on the inner side wall of the embedded groove 43. The infrared rangefinder 6 can detect the wear of the electric grinding wheel 7. The infrared rangefinder 6 can quickly capture the wear changes of the grinding wheel at the micron level by virtue of high-frequency real-time monitoring. Its detection response is immediate. Compared with manual measurement, which is easily affected by subjective operation, low measurement frequency and environmental interference, infrared ranging can accurately control errors and stably output high-precision data through non-contact measurement and precise algorithm filtering. The device provides a glass protection plate 45 at the side end of the embedded groove 43 to protect the infrared rangefinder 6. The glass protection plate 45 can effectively block the contaminants such as grinding chips, coolant and dust splashed during the processing of the electric grinding wheel 7 through physical isolation, preventing them from directly impacting or adhering to the lens and sensor surface of the infrared rangefinder 6, thereby preventing measurement deviation or equipment failure caused by contamination of optical components. At the same time, the device can rely on the high light transmittance of the transparent material of the glass protection plate 45 to ensure that the emission and reception of the infrared light beam are not significantly hindered, thereby maintaining the distance measurement accuracy. The device has a good protective effect on the infrared rangefinder 6. In the third step, after the terminal block 32 on the servo motor 3 is started by receiving the signal of the relay 62, the servo motor 3 will drive the threaded rod 33 to rotate. The rotation of the threaded rod 33 will drive the ear plate 74 to move downward through the thread groove 75. The downward movement of the ear plate 74 will drive the annular plate 73 to move downward. The downward movement of the annular plate 73 will drive the transmission shaft 71 to move downward. The downward movement of the transmission shaft 71 will drive the electric grinding wheel 7 to move downward. Because a certain detection threshold is set on the infrared rangefinder 6, the rotation of the threaded rod 33 by the servo motor 3 will also be driven according to the wear threshold. After the threaded rod 33 rotates and drives the electric grinding wheel 7 to a suitable position, it will stop rotating, thereby changing the position of the electric grinding wheel 7 to achieve motor compensation. The device is provided with an adjustable electric grinding wheel 7, and the infrared rangefinder 6 drives the servo motor 3 to adjust the position of the electric grinding wheel 7, thereby realizing the automatic compensation function of the electrode, ensuring that the electrode is always in the optimal processing position, and the adjustment threshold of the electrode compensation of the electric grinding wheel 7 can be accurately adjusted according to the real-time wear degree, which is more accurate and timely than manual adjustment, and continuously maintains the accuracy of the position of the electric grinding wheel 7 and the quality of the workpiece processing after the electrode automatic compensation; This device provides a telescopic rod 31 at the upper end of the servo motor 3, which allows the servo motor 3 to move synchronously with the up and down movement of the electric grinding wheel 7, ensuring that the threaded rod 33 at the output end of the servo motor 3 and the threaded groove 75 always maintain precise engagement, avoiding problems such as overloading, jamming or transmission failure due to changes in relative position, and ensuring the stability and reliability of the transmission system. At the same time, when the electric grinding wheel 7 is dynamically adjusted, the servo motor 3 can adapt to the displacement changes of the electric grinding wheel 7 in the process of driving the threaded rod 33 to rotate to achieve position compensation of the electric grinding wheel 7, and is flexible to use.

[0020] In the fourth step, a side connecting rod 72 is also set between the annular plate 73 and the movable column 5. When the electric grinding wheel 7 moves up and down, the side connecting rod 72 will be driven to move through the annular plate 73. The movement of the side connecting rod 72 will drive the movable column 5 to move. The movement of the movable column 5 will drive the brush 51 to move synchronously with the position of the electric grinding wheel 7, avoiding the interference risk caused by the lagging or leading movement of the brush 51, and ensuring that the relative position of the brush 51 and the electric grinding wheel 7 always meets the electrical contact requirements during the movement, thereby ensuring the quality of its workpiece processing.

[0021] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A handheld, efficient, multifunctional arc machining device, comprising a handheld handle (1) and a controller (8), characterized in that: The handheld handle (1) is provided with a processing mechanism for performing arc processing, and the handheld handle (1) is provided with a compensation mechanism for performing electrode compensation; The processing mechanism comprises a fixed housing (2), a splash shield (4), a movable column (5) and an electric grinding wheel (7); the compensation mechanism comprises a servo motor (3) and an infrared rangefinder (6); the fixed housing (2) is fixedly mounted on the side end of the servo motor (3); the splash shield (4) is located at the lower end of the fixed housing (2); a mounting block (22) is fixedly mounted on the lower end of the fixed housing (2); the servo motor (3) is located at the lower end of the mounting block (22); the movable column (5) is located on the splash shield (4); and the infrared rangefinder (6) is fixedly mounted on the inner side wall of the splash shield (4).

2. A handheld, efficient, multifunctional arc machining device as claimed in claim 1, characterized in that: A wiring terminal (11) is fixedly mounted on the side end of the hand-held handle (1), and a speed regulating knob (12) is fixedly mounted on the circumferential end of the hand-held handle (1).

3. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 2, characterized in that: A connecting column (21) is fixedly mounted on the lower end of the fixed housing (2), and a telescopic rod (31) is fixedly mounted between the servo motor (3) and the mounting block (22).

4. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 3, characterized in that: A terminal block (32) is fixedly mounted on the circumferential end of the servo motor (3), and a threaded rod (33) is fixedly mounted on the output end of the servo motor (3).

5. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 4, characterized in that: A first circular groove (41) is formed through the upper end of the splash shield (4), a second circular groove (42) is formed through the upper end of the splash shield (4), an embedded groove (43) is formed at the circumferential end of the inner side wall of the splash shield (4), and a glass protection plate (45) is fixedly mounted on the side end of the embedded groove (43).

6. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 5, characterized in that: The movable column (5) is slidably mounted on the inner side wall of the second circular groove (42), and a brush (51) is fixedly mounted on the lower end of the movable column (5).

7. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 6, characterized in that: The infrared rangefinder (6) is fixedly mounted on the inner side wall of the embedded groove (43); a relay (62) is fixedly mounted on the upper end of the splash shield (4); a second connecting wire (63) is fixedly mounted between the infrared rangefinder (6) and the relay (62); and a first connecting wire (61) is fixedly mounted between the infrared rangefinder (6) and the wiring board (32).

8. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 7, characterized in that: The electric grinding wheel (7) is located on the inner side wall of the splash shield (4), and a transmission shaft (71) is fixedly mounted on the upper end of the electric grinding wheel (7). The transmission shaft (71) is installed through the inner side wall of the first circular groove (41). The transmission shaft (71) is fixedly mounted in the fixed housing (2), and an annular plate (73) is fixedly mounted on the circumferential end of the transmission shaft (71).

9. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 8, characterized in that: A side connecting rod (72) is fixedly installed between the annular plate (73) and the movable column (5), and an ear plate (74) is fixedly installed at the circumferential end of the annular plate (73).

10. A handheld high-efficiency and multifunctional arc machining device as claimed in claim 9, characterized in that: A threaded groove (75) is formed through the upper end of the ear plate (74), and the threaded rod (33) is threadably mounted on the inner side wall of the threaded groove (75).

Images