Portable automatic magnetic drill

Abstract

The invention belongs to the technical field of electric tools, and relates to a portable automatic magnetic drill. The main drilling machine head is composed of a machine shell, a main gear motor, a drive control circuit, a man-machine interface board and a storage battery, and the electric control permanent magnetic chuck is provided with double electric push rods. The main drilling machine head is combined with an electric control permanent magnetic chuck with double electric push rods to form a symmetrical rack capable of automatically feeding. And the driving control circuit drives and controls the rotary operation of the drilling speed reducing motor, the suction and release of the electric control permanent magnetic chuck, and the synchronous elongation, synchronous shrinkage and stop of the double electric push rods. The requirement of the drilling machine for the rigidity of the rack is low from the overall structural layout, and on the premise that the drilling quality is guaranteed, the used rack material is small in size and light in weight, so that carrying and high-position lifting operation are convenient. An automatic execution system is arranged in the drilling machine, manual holding stress application feeding is not needed in the drilling process, and drilling operation on special occasions (such as suspension, high position and upward position) where manual holding stress application is not convenient becomes possible.

Description

Technical Field

[0001] The invention belongs to the technical field of electric tools, and in particular relates to a portable automatic magnetic drill. Background Art

[0002] Magnetic drills are widely used in the construction, manufacturing, and renovation of bridges, power transmission, ships, chemicals, petroleum, and coal mines. Currently, the widely used magnetic drills have an electromagnetic base. If the power fails and the base loses its magnetic force, the drill will fall off, causing a safety hazard. Existing magnetic drills require manual force to feed the drill, and the operator's hands must remain on the drill. To ensure drilling accuracy, the drill frame must be highly rigid, so the cross-sectional area of the material used cannot be too small, making it difficult to reduce the weight. The heavy weight makes it difficult to lift, making drilling difficult or even impossible in special situations where manual control is not convenient (such as suspended, elevated, or supine positions).

[0003] Existing magnetic drills, such as the Chinese utility model patent application number "201420029010.3," titled "A Hollow-Core Magnetic Drill," and the PCT invention patent application number "201480019039.6," titled "Battery-Type Drill," require high rigidity in their support structure because their frame is located to the side of the drilling axis. If the rigidity is too low, the reaction force generated during drilling will cause the frame to deform, generating lateral forces that deviate from the drilling center. This not only increases drilling power consumption but also causes the drilled hole to be misaligned, reducing hole quality. Therefore, a rigid support structure is necessary. However, a rigid support structure results in a larger cross-section, larger volume, and heavier weight, making it difficult to carry and lift the magnetic drill, limiting its application in some specialized applications.

[0004] Another existing magnetic drill, such as the Chinese utility model patent application number "201921541727," entitled "A Handheld Magnetic Drill with Positioning Function," utilizes a standard hand drill mounted on a bracket with a magnetic chuck. This drill requires manual force to drill. When drilling deep holes in thick steel workpieces, the operator's constant, direct pressure is labor-intensive. This also inevitably generates non-vertical, deflecting, and lateral forces. Given the limited rigidity of the bracket and hand drill assembly, this can affect drilling accuracy. This can be particularly challenging in difficult environments where manual force application is undesirable (such as suspended, elevated, or in an upright position). Furthermore, because the drill utilizes an electromagnetic magnetic chuck, it requires continuous power to maintain magnetic force, resulting in high energy consumption and low safety. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art by providing a portable, automatic magnetic drill powered by an internal battery. The drill must not only offer high safety, ensuring power outage resistance after the magnetic chuck engages a steel workpiece, but also, crucially, be lightweight for easy high-altitude lifting. Furthermore, the drill must automatically feed the hole, making it possible to drill holes in difficult environments (e.g., suspended, elevated, or supine positions) where manual power drilling is inconvenient.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: it includes a casing with a battery accommodating portion and a drilling reduction motor, and also includes an electric-controlled permanent magnetic suction cup with a double electric push rod, the double electric push rod is composed of two electric push rods, the axes and telescopic directions of the two electric push rods are parallel to each other and perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup, the electric-controlled permanent magnetic suction cup has upper and lower transparent spaces for convenient passage of the drill bit, and the bottom ends of the two electric push rods are rigidly fixed to the two sides of the space of the electric-controlled permanent magnetic suction cup.

[0007] The body of the drilling reduction motor is fixed in the casing, and the lower end of its torque output shaft extends out of the bottom of the casing, and can be docked to install a drilling fixture. The axis of its torque output shaft is also perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup, and is located in the middle of the two electric push rod axes and corresponds to the empty position of the lower electric-controlled permanent magnetic suction cup for the drill bit to pass through. When drilling, the drill bit drills the workpiece through the empty space.

[0008] The upper mechanism of the dual electric push rods, namely the bodies of their respective servo reduction motors and the outer tubes of the push rods, are fixed within the housing. The housing and the various components integrated therein together form the main drilling head. The dual electric push rods enable the main drilling head to move back and forth electrically relative to the bottom surface of the electrically controlled permanent magnetic chuck, thereby forming the electric feed frame of the magnetic drill.

[0009] The present invention utilizes an electrically retractable frame structure combining a main drill head with an electrically controlled permanent magnetic chuck equipped with dual electric push rods. Preferably, the two push rods have identical mechanical parameters and bending stiffness, and their axes lie in the same plane as the torque output shaft, symmetrically and parallel to each other on either side of the axis of the drilling reduction motor's torque output shaft. Precisely due to this spatial symmetry and the identical mechanical parameters and bending stiffness of the two push rods, when the drill bit is fed, the reaction force of the feed pressure is symmetrically and evenly borne by the two push rods, thus preventing lateral forces that could tilt the drill bit. Furthermore, the reaction torque generated by the drilling torque on the frame during drilling is symmetrically borne by the push rods on either side. Even if the push rods undergo some bending deformation, the deformation is symmetrically rotated along the axis of the torque output shaft, preventing the center axis of symmetry from shifting. Therefore, the drill bit's center and verticality remain unchanged, which helps ensure accurate positioning during drilling. In addition, the dual electric push rods use synchronous extension and contraction control, and the drilling rig feed pressure is concentric and coaxial with the drilling mandrel. This avoids the lateral deflection force that may be generated when a conventional side frame or an ordinary drilling rig is manually controlled and fed. Therefore, the symmetrical frame structure of the present invention is combined with the electric feed mechanism, and the frame rigidity requirements are greatly reduced compared to the mechanism with the frame on the side. Therefore, the cross-section of the relevant components can be designed to be relatively small, thereby significantly reducing the overall weight of the drilling rig. The present invention reduces the rigidity requirements of the drilling rig on the frame from the overall structural layout. Under the premise of ensuring the quality of drilling, the material used is small in volume and as light as possible, thus facilitating portability and high-position lifting.

[0010] It also includes a drive control circuit arranged in the casing, which includes a main control part, a DC / DC converter for powering the main control part, and a battery power detection part for power management; it also includes a drilling reduction motor drive part, a magnetization drive part, and a servo reduction motor drive part. The drilling reduction motor, the magnetization coil of the electric-controlled permanent magnetic suction cup, and the two servo reduction motors of the dual electric push rods are respectively electrically connected to the corresponding parts in the drive control circuit.

[0011] It also includes a human-machine interface board electrically connected to the drive control circuit, which is provided with a switch group and a display screen. By manually operating the corresponding switches of the switch group, the driving control circuit can set the drilling program parameters and operate the magnetic drill.

[0012] The drive control circuit uses the battery housed in the housing as a power source to drive and control the drilling reduction motor and the electric-controlled permanent magnetic chuck respectively, and drives and controls the synchronous extension, contraction or stop of the dual electric push rods.

[0013] A drive control circuit controls the simultaneous extension, retraction, or stop of the dual electric push rods, achieving electric balanced feeding. Feed force, feed depth, stop, and return are all preset within the drive control circuit's internal program. This allows the magnetic drill to automatically feed without manual force application or control.

[0014] The present invention uses an electrically controlled permanent magnetic chuck as the magnetic base for the drill. Its unique feature is that the magnetizing coil only needs to be supplied with a short, high-current pulse in the forward or reverse direction when engaging or releasing a workpiece. In the engaged state, the permanent magnet within the chuck maintains the magnetic attraction, eliminating the need for further power. This not only saves energy but also prevents accidents such as the loss of magnetic force during operation in conventional electromagnetic drills, which can lead to the drill becoming loose from the workpiece or equipment. This achieves high safety.

[0015] A handle is provided near the upper part of the casing. The handle is formed on the upper part of the casing due to the handle being left out. A cavity is provided in the handle. The battery can be fixedly or pluggably accommodated in the cavity.

[0016] The attraction or release of the electric-controlled permanent magnetic chuck can be triggered by the corresponding switch of the switch group on the human-machine interface board, and the attraction switch and the release switch can also be directly derived from the magnetization drive part in the drive control circuit to directly trigger the attraction or release of the electric-controlled permanent magnetic chuck 1.

[0017] In summary, the present invention achieves light weight, automation, high safety, and portability from the overall layout of the mechanism, making it possible to perform drilling in special situations (such as suspended, high-position, and supine positions) where manual power drilling is inconvenient.

[0018] By presetting the program within the drive control circuit, the number of revolutions and direction of the drilling reduction motor and the feed rate and direction of the dual electric push rods are set to a preset parameter ratio, thus becoming the preferred preset operation menu. Furthermore, under the premise that the strength of the magnetic drill body can withstand it, the function of a power screw machine can be realized.

[0019] Since the operator only needs to perform drilling positioning and start execution, the operator's hands can be off the drill rig during drilling. The beneficial effect of the expansion is that one person can operate multiple magnetic drills of the present invention at multiple stations at the same time, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the appearance of the present invention.

[0021] Figure 2 This is a schematic block diagram of the electrical components of the present invention.

[0022] Figure 3It is a top view of the present invention.

[0023] Figure 4 It is a partial cross-sectional view of the main structure of the present invention along line A-A.

[0024] Figure 5 This is a top view of the electrically controlled permanent magnetic chuck according to embodiment 1 of the present invention.

[0025] Figure 6 1 is a cross-sectional view B-B of the electrically controlled permanent magnetic chuck and a schematic diagram of the magnetic force line circuit in the attracted state of Example 1 of the present invention.

[0026] Figure 7 This is a top view of the electrically controlled permanent magnetic chuck according to embodiment 2 of the present invention.

[0027] Figure 8 2 is a cross-sectional view C-C of the electrically controlled permanent magnetic chuck and a schematic diagram of the magnetic force line circuit in the attracted state of Example 2 of the present invention.

[0028] Figure 9 1 is a cross-sectional view B-B of the electro-permanent magnetic chuck and a schematic diagram of the magnetic field line loop in the released state of Example 1 of the present invention.

[0029] Figure 10 2 is a cross-sectional view C-C of the electro-permanent magnetic chuck and a schematic diagram of the magnetic field line loop in the released state of Example 2 of the present invention.

[0030] Figure: 1. Electric-controlled permanent magnetic chuck; 2. Inner tube; 3. Outer tube; 4. Nut; 5. Main reduction motor; 6. Lead screw; 7. Servo reduction motor; 8. Casing; 9. Battery; 10. Drive control circuit; 11. Human-machine interface board; 12. Switch group; 13. Display screen; 14. Suction cup cover; 15. Magnetic pole shoe ring; 16. Outer magnetic ring; 17. Reversible permanent magnet; 18. Strong permanent magnet; 19. Magnetizing coil; 20. Handle left blank; 21. Handle; 22. DC power jack; 23. Main reduction motor output shaft; 24. Axis of the main reduction motor output shaft; 25. Drill chuck; 26. Workpiece; 27. Double electric push rod; 71. Electric push rod; 72. Electric push rod; 81. Magnetic drill head; 151. Magnetic cover; 161. Bottom magnetic strip; 171. Reversible permanent magnet; 181. Strong permanent magnet; 191. Pull-on switch; 192. Release switch.

[0031] The present invention will be further described in detail below by way of embodiments with reference to the accompanying drawings.

[0032] Example 1

[0033] See attached Figures 1 to 4A portable automatic magnetic drill includes a casing 8 with a battery 9 accommodating portion and a drilling reduction motor 5, and also includes an electric-controlled permanent magnetic suction cup 1 with a double electric push rod 27, wherein the double electric push rod 27 is composed of two electric push rods 71 and 72, the axes and telescopic directions of the two electric push rods are parallel to each other and perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup 1, and the electric-controlled permanent magnetic suction cup 1 has upper and lower transparent spaces for convenient passage of the drill bit, and the bottom ends of the electric push rod 71 and the electric push rod 72 are rigidly fixed to the two sides of the space of the electric-controlled permanent magnetic suction cup 1.

[0034] The body of the drilling reduction motor 5 is fixed in the casing 8, and the lower end of its torque output shaft 23 extends out of the bottom of the casing 8, and can be docked with a drill chuck 25. The axis 24 of its torque output shaft is also perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup 1, and is located in the middle of the axis of the electric push rod 71 and the electric push rod 72 and corresponds to the empty position of the lower electric-controlled permanent magnetic suction cup 1 for convenient passage of the drill bit.

[0035] The mechanisms on the upper portion of the dual electric push rods 27, namely, the bodies of the servo reduction motors 7 on the upper portions of the electric push rods 71 and 72, and the outer tubes 3 of the electric push rods, are each secured within a housing 8. The housing 8, along with the various components integrated therein, constitutes a magnetic drill head 81. The dual electric push rods 27 enable the main drill head 81 to electrically move back and forth relative to the bottom surface of the electrically controlled permanent magnetic chuck, thereby forming an electrically powered feed frame for the magnetic drill. When the magnetic drill head 81 approaches the bottom surface of the electrically controlled permanent magnetic chuck 1, the drill's feed function is realized; when the magnetic drill head 81 moves away from the bottom surface of the electrically controlled permanent magnetic chuck 1, the drill's return function is realized.

[0036] The two electric push rods 71 and 72 of the dual electric push rod 27 have the same structure and electromechanical parameters. Each includes its own servo reduction motor 7, outer tube 3, inner tube 2, lead screw 6, and nut 4. The lead screw 6 is fixed coaxially with the torque output shaft of the corresponding servo reduction motor 7. The inner wall of the outer tube 3 and the outer wall of the inner tube 2 slide together to allow relative linear movement in the longitudinal direction. The nut 4 is fixed to the top of the inner tube 2. The nut 4 and the lead screw 6 form a longitudinally driven lead screw nut pair. The threaded portion of the lead screw can rotate along its axis to enter or exit the inner cavity of the electric push rod inner tube 2. Optimally, the axes of the two electric push rods 71 and 72 are in the same plane as the torque output shaft 24, and are located parallel to each other and symmetrically on both sides of the axis of the drilling reduction motor torque output shaft.

[0037] The inner tube 2 of the electric push rod is made of a high-strength metal material, preferably a non-magnetic stainless steel tube, which can avoid rust and magnetic adhesion of broken iron chips and is easy to clean.

[0038] The outer tube 3 of each of the electric push rod 71 and the electric push rod 72 can be an individual component or can be directly integrally formed at the corresponding position of the housing 8. In this case, the portion is a part of the housing 8 and slides with the outer wall of the inner tube 2 to function as the outer tube of the electric push rod.

[0039] The machine body 8 also includes a drive control circuit 10 disposed within the housing 8. The drive control circuit 10 includes a main control unit with an MCU, a DC / DC converter that powers the main control unit, and a battery charge detection unit for power management. The drive control circuit 10 also includes a drilling reduction motor drive unit, a magnetization drive unit, and a servo reduction motor drive unit. The drilling reduction motor 5, the magnetization coil 19 of the electric-controlled permanent magnetic chuck 1, and the two servo reduction motors 7 of the dual electric push rod 27 are all electrically connected to corresponding components within the drive control circuit 10. The drive control circuit 10 can be disposed on a single circuit board or distributed across different circuit boards to form functional module boards for each component. This facilitates decentralized installation, fully utilizes the dispersed space within the housing 8, and miniaturizes the machine head 81.

[0040] The drive control circuit 10 uses the battery 9 stored in the casing 8 as a power source to drive and control the rotation of the drilling reduction motor 5, drives and controls the attraction and release of the electric-controlled permanent magnetic suction cup 1, and drives and controls the synchronous extension, synchronous contraction and stop of the dual electric push rods 27.

[0041] During drilling, if the battery power detection unit detects that the battery power is lower than the set value, it will feedback to the main control unit, and the main control unit will control the servo reduction motor drive unit to control the double electric push rod 27 to first stop feeding, then retract the tool to return to the upper limit, and then control the drilling reduction motor drive unit to stop supplying power to the drilling reduction motor 5. This program control method can prevent the drill bit from being stuck in the deep hole and unable to be removed due to a sudden shutdown when the battery is low.

[0042] The machine also includes a human-machine interface panel 11, located on top of the housing 8 and electrically connected to the drive control circuit 10. A switch group 12 and a display screen 13 are provided on the panel. By manually operating the corresponding switches of the switch group 12, the main control unit of the drive control circuit 10 is configured to set drilling program parameters and operate the magnetic drill. The setting status, execution progress, and remaining battery power are displayed on the display screen 13 on the switch panel. The drilling speed and drilling depth can be preset according to work needs, and the system automatically returns and stops after reaching the preset values, achieving automated drilling. Furthermore, by presetting the program within the drive control circuit 10, the number of revolutions and direction of the drilling reduction motor and the feed rate and direction of the dual electric push rods 27 are set to a preset parameter ratio, thereby forming the preferred preset operation menu. Furthermore, under the premise that the strength of the magnetic drill body can withstand it, the function of a power drill can be achieved.

[0043] Figure 3The number and layout of switches in the switch group 12 are merely illustrative and are not intended to limit the present invention.

[0044] The maximum distance (upper limit) and the minimum distance (lower limit) between the magnetic drill head 81 and the electric-controlled permanent magnetic chuck 1 are both digitally set and limited by the internal program of the drive control circuit 10 through the human-machine interface board 11, without the need for additional limit switches.

[0045] The housing 8 is provided with a handle recess 20 near the top, forming a handle 21 on the top of the housing. A cavity is provided within the handle 21, which can accommodate a battery 9 either fixedly or removably. Preferably, the battery 9 is removably accommodated within the housing, so that when a battery set is insufficient in capacity at a work site without mains power, a spare battery can be easily replaced to allow work to continue.

[0046] The human-machine interface panel 11 is arranged at a position on the housing 8 that is convenient for operation, and is preferably arranged on the top of the handle 21 .

[0047] The electric-controlled permanent magnetic chuck 1 can be engaged or released by corresponding switches in the switch assembly 12. Alternatively, the engagement switch 191 and release switch 192 can be directly derived from the magnetization drive unit within the drive control circuit 10, thereby directly triggering the engagement or release of the electric-controlled permanent magnetic chuck 1. The two switches can be located in a convenient position on the housing 8. In this embodiment, the two switches are installed below the handle recess 20, which facilitates operation during drilling and positioning. This position is for demonstration purposes only and is not intended to limit the present invention.

[0048] This embodiment also includes an external DC power socket 22, which is electrically connected to the power supply circuit of the drive control circuit 10. When a mains power line is available and a large number of drilling operations are required, an external DC power supply can be connected to continuously power the magnetic drill. During drilling breaks, the battery 9 can also be recharged, thereby compensating for the limited battery power of the battery 9. The provision of the DC power socket 22 is merely a configuration option and is not intended to limit the present invention.

[0049] See attached Figure 5 , Attachment Figure 6As shown, the electrically controlled permanent magnetic chuck 1 has a transparent top and bottom opening, which gives the planar shape of the electrically controlled permanent magnetic chuck 1 a closed ring. The electrically controlled permanent magnetic chuck 1 comprises a magnetic pole shoe ring 15, a reversible permanent magnet 17, a strong permanent magnet 18, a magnetizing coil 19, and a bottom magnetic ring 16. The reversible permanent magnet 17 and the strong permanent magnet 18 can be a single ring or constructed from multiple pieces. The magnetizing coil 19 is mounted on the outside of the magnetic pole shoe ring 15 and inside the reversible permanent magnet 17. The strong permanent magnet 18 is located below the magnetizing coil 19. The bottom magnetic ring 16 is located below the reversible permanent magnet 17 and mounted outside the strong permanent magnet 18. The magnetic potential direction of the strong permanent magnet 18 is radially distributed in polar coordinates.

[0050] When the magnetization drive unit in the drive control circuit 10 adds a positive magnetization current pulse to the magnetization coil 19, the reversible permanent magnet 17 is positively magnetized through the bottom magnetic ring 16 - ferromagnetic workpiece 26 - magnetic pole shoe ring 15 magnetic circuit. At this time, the residual magnetic potential direction of the reversible permanent magnet 17 is opposite to the magnetic potential direction of the strong permanent magnet 18, as shown in the attached figure. Figure 6 As shown by the middle dotted line, under the action of their respective magnetic potentials, the residual magnetic fluxes of the reversible permanent magnet 17 and the strong permanent magnet 18 are collected and superimposed in parallel by the outer magnetic ring 16, forming a magnetic circuit through the ferromagnetic workpiece 26 - the magnetic pole shoe ring 15. At this time, the magnetizing coil 19 does not need to be powered on anymore and the electronically controlled permanent magnetic chuck 1 can firmly attract the workpiece, so the drilling rig can start drilling operations.

[0051] The drill chuck 25 and the workpiece 26 in the accompanying drawings are only schematic diagrams for the convenience of explaining the principle of the present invention and are not considered as the specific content of the present invention.

[0052] See attached Figure 9 When the workpiece 26 needs to be released, the magnetization drive unit in the drive control circuit 10 adds a reverse magnetization current pulse to the magnetization coil 19, causing the reversible permanent magnet 17 to first demagnetize and then magnetize in the reverse direction, as shown in the attached figure. Figure 9 As shown by the middle dotted line, at this time, the direction of the residual magnetism of the reversible permanent magnet 17 is consistent with the direction of the magnetic potential of the strong permanent magnet 18. Under the action of the magnetic potential of the reversible permanent magnet 17, the residual magnetism of the strong permanent magnet 18 passes through the magnetic pole shoe ring 15 and the outer magnetic conductive ring 16 to form a magnetic circuit, and its magnetic lines of force no longer pass through the workpiece 26, so that the electric-controlled permanent magnetic chuck 1 releases the workpiece 26, and the drilling rig can be moved to take it away.

[0053] The materials of the magnetic pole shoe ring 15 and the outer magnetic ring 16 are soft magnetic materials with low coercivity, high magnetic permeability and high saturation magnetic flux density, such as pure iron, iron-based low-carbon steel, and silicon steel. Iron-based low-carbon steel is preferred in terms of cost and strength. The reversible permanent magnet 17 refers to the reversible permanent magnet 17 material having a coercive force that is smaller than the coercive force of the strong permanent magnet 18 material, which is only a fraction or a dozen times smaller than the latter. The materials of the reversible permanent magnet 17 include manganese aluminum carbon, aluminum nickel cobalt or iron chromium cobalt. The materials of the strong permanent magnet 18 include permanent ferrite, samarium cobalt or neodymium iron boron, and the coercive force ranges from 600 to 2000 kA / m. When a forward pulse current flows through the magnetizing coil 19, its magnetizing potential is greater than the coercive force of the reversible permanent magnet 17, and the reversible permanent magnet 17 can be magnetized in the forward direction. When a reverse pulse current flows through the magnetizing coil 19, the reversible permanent magnet 17 can be demagnetized and then magnetized in the reverse direction. Here, the electrical parameter values of the forward or reverse magnetizing current pulses passing through the magnetizing coil 19 are set to such an electrical parameter value that the magnetizing potential generated by the magnetizing coil 19 can only magnetize, demagnetize, and magnetize the reversible permanent magnet 17 in the forward direction, and is not sufficient to produce a demagnetization effect on the strong permanent magnet 18.

[0054] The electrically controlled permanent magnetic suction cup 1 is formed into a closed ring with a hollow middle portion due to the hollow core in the middle portion of the magnetic pole shoe ring 15. The hollow middle portion allows the drill bit to pass through and also has the function of collecting drill cuttings to prevent them from flying around. The bottom surface of the electrically controlled permanent magnetic suction cup 1 is a magnetic attraction surface. The upper portion of the magnetic pole shoe ring 15 has an outwardly extending eaves ring, which can provide magnetic conductivity for the reversible permanent magnet 17 and is also used for fixed connection with the bottom of the double electric push rod 27. The reversible permanent magnet 17 and the strong permanent magnet 18 can be an integral ring, or they can be spliced into a ring with multiple rectangular or arc-shaped pieces to reduce costs. When the reversible permanent magnet 17 is spliced in multiple pieces, the outside of the electric permanent magnetic suction cup 1 needs to be wrapped and integrated with a non-magnetic suction cup cover 14.

[0055] The magnetic components of the electric-controlled permanent magnetic chuck 1 can be fixed with non-magnetic screws and glued, or can be directly glued and sealed into one.

[0056] The reversible permanent magnets 17 are located radially outward of the magnetic chuck because the larger outer circumference allows for more reversible permanent magnets to be placed. This increases the total magnetic flux of the chuck when engaged, thus achieving greater magnetic attraction. Placing the magnetic pole shoe ring 15 on the inner ring offers the advantages of less magnetic flux leakage, less attraction of scrap metal, and improved cleaning compared to placing the reversible permanent magnets there.

[0057] The overall structural layout of this invention reduces the rigidity requirements of the drilling rig frame and streamlines the mechanism. While ensuring drilling quality, the materials used are compact and lightweight, achieving ease of portability and high-position lifting, reduced labor intensity, and enhanced safety. Furthermore, the built-in electromechanical automation system enables drilling in special situations where manual power drilling is inconvenient (such as suspended, elevated, and supine positions).

[0058] Example 2

[0059] Referring to Example 1, the feature thereof is that except for the electrically controlled permanent magnetic chuck 1, the other parts are the same as those of Example 1.

[0060] See attached Figure 7 , Attachment Figure 8 The electrically controlled permanent magnetic chuck 1 of this embodiment has a hollow space with a transparent opening at the top and bottom. This hollow space gives the electrically controlled permanent magnetic chuck 1 an open ring shape with an opening on one side. The electrically controlled permanent magnetic chuck 1 comprises a magnetic shield 151, a reversible permanent magnet 171, a strong permanent magnet 181, a magnetizing coil 19, and a bottom magnetic strip 161. The reversible permanent magnet 171 is located at the top of the inner cavity of the magnetic shield 151. The magnetizing coil 19 is mounted outside the reversible permanent magnet 171. The strong permanent magnet 181 is located below the magnetizing coil 19. The bottom magnetic strip 161 is located below the reversible permanent magnet 171 and in the center of the strong permanent magnet 181. The magnetic potential direction of the reversible permanent magnet 171 is longitudinal, while the magnetic potential direction of the strong permanent magnet 181 is transverse, with both sides having the same polarity relative to the bottom magnetic strip 161.

[0061] See attached Figure 8 When the magnetization drive unit in the drive control circuit 10 adds a positive magnetization pulse to the magnetization coil 19, the reversible permanent magnet 171 is positively magnetized through the bottom magnetic strip 161, the ferromagnetic workpiece 26, and the magnetic cover 151. The direction of the residual magnetic potential is opposite to that of the strong permanent magnet 181. Figure 8 As shown by the middle dotted line, under the action of their respective magnetic potentials, the residual magnetic fluxes of the reversible permanent magnet 171 and the strong permanent magnet 181 are collected and superimposed in parallel by the bottom magnetic strip 161, forming a magnetic circuit through the ferromagnetic workpiece 26 - the magnetic pole shoe ring 151. At this time, the magnetizing coil 19 does not need to be energized any more to firmly attract the workpiece with the electrically controlled permanent magnetic chuck 1, and the drilling rig can perform drilling operations.

[0062] See attached Figure 10When the workpiece 26 needs to be released, the magnetization drive unit in the drive control circuit 10 adds a reverse magnetization current pulse to the magnetization coil 19, so that the reversible permanent magnet 171 is first demagnetized and then reversely magnetized. At this time, the direction of the residual magnetic potential of the reversible permanent magnet 171 is consistent with the direction of the magnetic potential of the strong permanent magnet 181. Under the action of the magnetic potential of the reversible permanent magnet 171, the residual magnetism of the strong permanent magnet 181 passes through the magnetic conductive cover 151 and the bottom magnetic conductive strip 161 to form a magnetic circuit. Its magnetic lines of force are shown in the attached figure. Figure 10 The middle dotted line shows that the workpiece 26 is no longer passed, so the electrically controlled permanent magnetic chuck 1 releases the workpiece 26 and the drilling rig can be moved to remove it.

[0063] The material of the magnetic cover 151 and the bottom magnetic strip 161 is a soft magnetic material with low coercivity, high magnetic permeability and high saturation magnetic flux density, such as pure iron, iron-based low-carbon steel, and silicon steel. Iron-based low-carbon steel is preferred in terms of cost and strength. The reversible permanent magnet 171 refers to the reversible permanent magnet 171 material having a smaller coercivity than the strong permanent magnet 181 material, which is only a fraction or a dozen times smaller than the latter. The material of the reversible permanent magnet 171 includes manganese aluminum carbon, aluminum nickel cobalt or iron chromium cobalt. The material of the strong permanent magnet 181 includes permanent ferrite, samarium cobalt or neodymium iron boron, and the coercivity ranges from 600 to 2000 kA / m. When a forward pulse current flows through the magnetizing coil 19, its magnetizing potential is greater than the coercive force of the reversible permanent magnet 171, causing the reversible permanent magnet 171 to be magnetized in the forward direction. When a reverse pulse current flows through the magnetizing coil 19, the reversible permanent magnet 171 can be demagnetized and then magnetized in the reverse direction. Here, the electrical parameter values of the forward or reverse magnetizing current pulses flowing through the magnetizing coil 19 are set to such an electrical parameter value that the magnetizing potential generated by the magnetizing coil 19 can only magnetize, demagnetize, and magnetize the reversible permanent magnet 17 in the forward direction, and is not sufficient to produce a demagnetization effect on the strong permanent magnet 181.

[0064] The magnetic shield 151 of this embodiment has an open ring shape (U or C). The bottoms of the two inner tubes 2 of the dual electric push rods 27 are rigidly fixed to the ends of the open ring of the magnetic shield 151. The lower portion between the two inner tubes 2 corresponds to a corresponding open position, which allows the drill bit to pass through. The advantage of using an open ring is that the drill bit center alignment can be observed through the opening during drilling positioning, and after drilling is completed, the opening is convenient for cleaning iron chips.

[0065] The magnetic components of the electric-controlled permanent magnetic chuck 1 can be fixed with non-magnetic screws and glued, or can be directly glued and sealed into one.

[0066] The above descriptions of the upper, lower, vertical, and horizontal directions in this specification are for ease of explanation and understanding only with reference to the drawings. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A portable automatic magnetic drill comprising a housing (8) having a battery receiving portion and a drilling reduction motor (5), characterized in that: It also includes an electric-controlled permanent magnetic suction cup (1) with a double electric push rod (27), and the electric-controlled permanent magnetic suction cup (1) has a transparent upper and lower space for the drill bit to pass through; the double electric push rod (27) is composed of two electric push rods, an electric push rod (71) and an electric push rod (72), the two axes and the telescopic directions of the electric push rod (71) and the electric push rod (72) are parallel to each other and perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup (1), and the bottom ends of the electric push rod (71) and the electric push rod (72) are respectively rigidly fixed to the two sides of the space of the electric-controlled permanent magnetic suction cup (1); The body of the drilling reduction motor (5) is fixed in the housing (8), the lower end of the torque output shaft (23) thereof extends out of the bottom of the housing (8), the axis (24) of the torque output shaft is also perpendicular to the bottom surface of the electric-controlled permanent magnetic chuck (1), and is located between the axes of the electric push rod (71) and the electric push rod (72) and corresponds to the empty position of the lower electric-controlled permanent magnetic chuck (1) for the drill bit to pass through; The mechanism on the upper part of the double electric push rod (27), i.e., the body of the servo reduction motor (7) on the upper part of the electric push rod (71) and the outer tube (3) of the electric push rod (72), are respectively fixed in the housing (8). The housing (8) and the components integrated therein together constitute a magnetic drilling head (81). The double electric push rod (27) can make the main drilling head (81) move back and forth electrically toward or away from the bottom surface of the electric-controlled permanent magnetic chuck, thereby constituting a magnetic drilling electric feed frame. The machine also includes a drive control circuit (10) disposed in the housing (8), wherein the drive control circuit (10) includes a main control unit, a drilling reduction motor drive unit, a magnetizing drive unit, and a servo reduction motor drive unit; the drilling reduction motor (5), the magnetizing coil (19) of the electric-controlled permanent magnetic chuck (1), and the two servo reduction motors (7) of the dual electric push rods (27) are electrically connected to corresponding units in the drive control circuit (10). The drive control circuit (10) uses the battery (9) housed in the battery receiving portion of the housing (8) as a power source to drive and control the rotation of the drilling reduction motor (5), to drive and control the attraction and release of the electric-controlled permanent magnetic chuck (1), and to drive and control the synchronous extension, synchronous contraction and stop of the dual electric push rods (27).

2. The portable automatic magnetic drill according to claim 1, wherein: The two electric push rods of the double electric push rod (27), namely the electric push rod (71) and the electric push rod (72), have the same structure and electromechanical parameters, and each includes its own servo reduction motor (7), outer tube (3), inner tube (2), lead screw (6) and nut (4); the lead screw (6) is fixed coaxially with the torque output shaft of the corresponding servo reduction motor (7), the inner wall of the outer tube (3) and the outer wall of the corresponding inner tube (2) are slidably matched and can move relatively straightly in the longitudinal direction, the nut (4) is fixed to the top of the corresponding inner tube (2), the nut (4) and the lead screw (6) form a lead screw nut pair, and the threaded portion of the lead screw (6) can rotate along its axis to enter or exit the inner cavity of the corresponding inner tube (2); The axes of the two electric push rods (71) and the electric push rod (72) are in the same plane as the torque output shaft (24) and are symmetrically located on both sides of the torque output shaft axis (23) in parallel with each other.

3. The portable automatic magnetic drill according to claim 1, characterized in that The invention also includes a human-machine interface board (11) electrically connected to the drive control circuit (10), on which a switch group (12) and a display screen (13) are provided, and is used to set program parameters of the drive control circuit (10) and operate the magnetic drill by manually operating the corresponding switches of the switch group (12).

4. The portable automatic magnetic drill according to claim 3, characterized in that The upper limit and lower limit of the distance between the magnetic drill head (81) and the electric-controlled permanent magnetic chuck (1) are both achieved by digitally setting the program parameters inside the drive control circuit (10) through the human-machine interface board (11).

5. The portable automatic magnetic drill according to claim 1, characterized in that: The electrically controlled permanent magnetic chuck (1) has a transparent space at the top and bottom, and the space makes the plane shape of the electrically controlled permanent magnetic chuck (1) a closed ring.

6. The portable automatic magnetic drill according to claim 5, characterized in that The electric-controlled permanent magnetic chuck (1) is composed of a magnetic pole shoe ring (15), a reversible permanent magnet (17), a strong permanent magnet (18), a magnetizing coil (19), and a bottom magnetic ring (16). The reversible permanent magnet (17) and the strong permanent magnet (18) can be in the form of an integral ring or can be formed by splicing multiple pieces into a ring. The magnetizing coil (19) is sleeved on the outside of the magnetic pole shoe ring (15) and the inside of the reversible permanent magnet (17). The strong permanent magnet (18) is located at the bottom of the excitation coil (19). The bottom magnetic ring (16) is located at the bottom of the reversible permanent magnet (17) and sleeved on the outside of the strong permanent magnet (18). The magnetic potential direction of the reversible permanent magnet (17) is longitudinal, and the magnetic potential direction of the strong permanent magnet (18) is radial polar coordinate radiation distribution.

7. The portable automatic magnetic drill according to claim 1, characterized in that The electrically controlled permanent magnetic chuck (1) has a space with openings that are transparent from top to bottom, and the space makes the plane shape of the electrically controlled permanent magnetic chuck (1) an open ring with an opening on one side.

8. The portable automatic magnetic drill according to claim 7, characterized in that The electrically controlled permanent magnetic chuck (1) is composed of a magnetic cover (151), a reversible permanent magnet (171), a strong permanent magnet (181), a magnetizing coil (19), and a bottom magnetic strip (161). The reversible permanent magnet (171) is located at the top of the inner cavity of the magnetic cover (151), the magnetizing coil (19) is sleeved outside the reversible permanent magnet (171), the strong permanent magnet (181) is located at the bottom of the magnetizing coil (19), the bottom magnetic strip (161) is located at the bottom of the reversible permanent magnet (171) and in the middle of the strong permanent magnet (181), the magnetic potential direction of the reversible permanent magnet (171) is longitudinal, and the magnetic potential direction of the strong permanent magnet (181) is transverse and has the same polarity relative to the bottom magnetic strip (161).

9. The portable automatic magnetic drill according to claim 2, characterized in that The outer tubes (3) of the electric push rod (71) and the electric push rod (72) are directly integrally formed at the corresponding position of the housing (8), that is, the position is both a part of the housing (8) and slides with the outer wall of the corresponding inner tube (2) to have the function of the outer tube of the electric push rod.

10. The portable automatic magnetic drill according to claim 3, characterized in that By presetting the program parameters inside the drive control circuit (10), the number of revolutions and the rotation direction of the drilling reduction motor (5) and the feed amount and the moving direction of the dual electric push rod (27) are in a preset parameter ratio relationship, thereby becoming a preset operation menu.

11. The portable automatic magnetic drill according to claim 3, characterized in that A pull-in switch (191) and a release switch (192) are directly derived from the magnetization drive unit in the drive control circuit (10); the pull-in switch (191) directly controls the pull-in of the electric-controlled permanent magnetic chuck (1); and the release switch (192) directly controls the release of the electric-controlled permanent magnetic chuck (1).

12. The portable automatic magnetic drill according to any one of claims 1 to 11, characterized in that The housing (8) is provided with a handle space (20) near the upper portion, and the handle space (20) forms a handle (21) on the upper portion of the housing. A cavity is provided in the handle (21), and the battery (9) can be fixedly or pluggably accommodated in the cavity.

13. The portable automatic magnetic drill according to claim 12, wherein : The human-machine interface panel (11) is arranged on the top of the handle (21).

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