Portable automatic magnetic drill

Abstract

The utility model 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 or renovation of bridges, power transmission, ships, chemicals, petroleum, coal mines, etc. The magnetic base of the currently widely used magnetic drill is an electromagnetic base. Once the power fails and the magnetic base loses its magnetism, the drilling machine will fall off and cause a safety accident, which has low safety. The existing magnetic drills require manual force to operate the feed when drilling, and the human hand cannot leave the drilling machine. In order to ensure the drilling accuracy, the drilling rig frame must have greater rigidity, so the cross-sectional area of ​​the material used cannot be too small, which makes it difficult to reduce the weight. The heavy weight is not convenient to lift, which makes drilling very difficult or impossible in some special occasions where it is not convenient to manually hold the drilling operation (such as suspended, high, supine, etc.).

[0003] Existing magnetic drills, such as the Chinese utility model patent with patent application number "201420029010.3" and the name "A hollow magnetic base magnetic drill" and the PCT international invention patent with patent application number "201480019039.6" and the name "battery-type puncher", have high rigidity requirements for the support structure because their frame mechanism is on the side of the drilling axis. If the rigidity is low, the reaction force generated during drilling will cause the frame to deform, and then generate lateral forces that deviate from the center of the drilling, which will not only increase the power consumption of drilling but also cause the drilled hole to be offset and the quality of the hole to decrease. Therefore, a support with high rigidity has to be used, and a support with high rigidity will result in a large cross-section, volume, and weight of the support material, which is not conducive to the portability and lifting of the magnetic drill, which limits its application in some special occasions.

[0004] Another existing magnetic drill, such as the Chinese utility model patent with the patent application number "201921541727" and the name "A handheld magnetic electric drill with positioning function", is to clamp an ordinary hand drill on a bracket with a magnetic suction cup. The drill must be manually fed with force to drill holes. When drilling deep holes in thicker steel workpieces, the labor intensity of the operator's continuous direct drilling pressure is very high, and it is inevitable that artificial non-vertical deflection and shaking lateral forces will be generated at this time, which will affect the drilling accuracy when the bracket and hand drill clamping rigidity are limited. Especially in some special occasions that are not conducive to manual grip and force application (such as suspension, high position, supine position, etc.), it will cause drilling difficulties. In addition, because it uses an electromagnetic magnetic suction cup, continuous power supply is required to maintain magnetic force, high energy consumption, and low safety. Summary of the invention

[0005] The purpose of the present invention is to overcome the above shortcomings of the prior art and provide a portable automatic magnetic drill powered by an internal storage battery. It should not only have high safety of not being afraid of power failure after the magnetic suction cup is positioned and sucked with the steel workpiece, but also be as light as possible to facilitate high-position lifting. Moreover, it should realize automatic feeding during drilling, thereby making it possible to drill holes in special occasions (such as suspended, high-position, supine position, etc.) where manual control and force drilling operations are inconvenient.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: 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 facilitating the 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 with a drilling fixture for installation. The axis of its torque output shaft is also perpendicular to the bottom surface of the electric-controlled permanent magnetic suction cup, and its position is in the middle of the axes of the two electric push rods 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 a hole in the workpiece through the empty space.

[0008] The upper mechanism of the double electric push rods, i.e., the body of each servo reduction motor and the outer tube of the electric push rods, are fixed in the casing respectively, and the casing and the components integrated therein together constitute the main drilling head. The double electric push rods can make the main drilling head move back and forth electrically toward or away from the bottom surface of the electric-controlled permanent magnetic chuck, thereby forming an electric feed frame for the magnetic drill.

[0009] The present invention adopts an electrically retractable frame structure that combines a main drill head with an electrically controlled permanent magnetic suction cup with dual electric push rods. Preferably, the two electric push rods of the dual electric push rods have the same mechanical parameters and bending rigidity, and the axes of the two electric push rods are in the same plane as the torque output shaft, and are parallel to each other and symmetrically located on both sides of the axis of the torque output shaft of the drilling reduction motor. It is precisely because of the spatial symmetry and the same mechanical parameters and bending rigidity of the two electric push rods that when the drill bit is fed and forced, the reaction force of the feed pressure is symmetrically and evenly borne by the two electric push rods, so that no lateral force that causes the drill bit to tilt will be generated. At the same time, the reaction torque generated by the drilling torque during drilling on the frame is symmetrically borne by the electric push rods on both sides. Even if the electric push rods produce a certain bending deformation, they are symmetrically rotated along the axis of the torque output shaft. The symmetrical center axis will not be offset, so the center and verticality of the drill bit will not change, which is conducive to ensuring the position accuracy during drilling. In addition, the double electric push rods are controlled by synchronous extension and contraction, and the drilling rig feed pressure is concentric and coaxial with the drilling mandrel, which avoids the lateral force that may be generated when the side frame or ordinary drilling rig is manually held and forced to feed. Therefore, the symmetrical frame structure of the present invention is combined with the electric feed mechanism, which greatly reduces the requirements for the frame rigidity compared to the mechanism on the side of the frame. Therefore, the cross-section of the relevant components can be designed to be relatively small, thereby greatly 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, and achieves the purpose of small volume and light weight of the materials used while ensuring the quality of drilling, so as to facilitate carrying and high-position lifting.

[0010] It also includes a drive control circuit arranged in the casing, which includes a main control unit, a DC / DC converter for powering the main control unit, and a battery power detection unit for power management; it also includes a drilling reduction motor drive unit, a magnetizing drive unit, and a servo reduction motor drive unit. The drilling reduction motor, the magnetizing 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, on which a switch group and a display screen are arranged. By manually operating the corresponding switches of the switch group, the drive control circuit is set with drilling program parameters and the magnetic drill is operated.

[0012] The driving control circuit uses the battery stored 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] The drive control circuit is used to control the synchronous extension, contraction or stop of the dual electric push rods to achieve electric balanced feeding. The feeding force, feeding depth, stop and return are all preset by the internal program of the drive control circuit. This achieves the purpose of automatic feeding of the magnetic drill without manual force control operation.

[0014] The present invention adopts an electrically controlled permanent magnetic chuck as a magnetic seat for a drilling rig. The characteristics of the electrically controlled permanent magnetic chuck are that only when the magnetization coil is magnetized with a workpiece or when the reverse magnetization is released, a short-term positive or reverse large pulse current needs to be supplied to the magnetization coil. In the attracted state, the permanent magnet inside the electrically controlled permanent magnetic chuck continues to maintain the magnetic attraction without the need for continued power supply. This saves electric energy and prevents safety accidents caused by the disappearance of the magnetic force of the chuck, which causes the drilling rig to loosen from the workpiece or equipment, due to an accidental power failure during operation of an ordinary electromagnetic magnetic drill, thereby achieving the purpose of high safety.

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

[0016] The closing or releasing 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 closing switch and the releasing switch can be directly led out from the magnetization drive part in the drive control circuit to directly trigger the closing or releasing of the electric-controlled permanent magnetic chuck 1 through the closing switch or the releasing switch.

[0017] In summary, the present invention has achieved light weight, automation, high safety and portability in terms of overall layout, making it possible to drill holes in special occasions (such as suspended, high position, supine position, etc.) where manual force drilling is inconvenient.

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

[0019] Since the operator only needs to perform drilling positioning and start execution, the operator's hands can be off the drilling rig during drilling. The beneficial effect of the expansion is that one person can operate multiple magnetic drilling rigs 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 It 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 It 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] Fig. 9 It is a cross-sectional view B-B of the electric permanent magnetic chuck and a schematic diagram of the magnetic force line loop in the released state of Example 1 of the present invention.

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

[0030] In the figure: 1. Electric controlled permanent magnetic suction cup; 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. No. 1 reversible permanent magnet; 18. No. 1 strong permanent magnet; 19. Magnetizing coil; 20. Handle is left blank; 21. Handle; 22. DC power socket; 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. No. 1 electric push rod; 72. No. 2 electric push rod; 81. Magnetic drill head; 151. Magnetic cover; 161. Bottom magnetic strip; 171. No. 2 reversible permanent magnet; 181. No. 2 strong permanent magnet; 191. Pull-in switch; 192. Release switch. Implementation

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

[0032] Example 1

[0033] See attached Figures 1 to 4A portable automatic magnetic drill comprises a casing 8 with a battery 9 accommodating portion and a drilling reduction motor 5, and also comprises an electric-controlled permanent magnetic chuck 1 with a double electric push rod 27, wherein the double electric push rod 27 consists of two electric push rods, namely a No. 1 electric push rod 71 and a No. 2 electric push rod 72, wherein 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 chuck 1, and the electric-controlled permanent magnetic chuck 1 has upper and lower transparent spaces for facilitating the passage of a drill bit, and the bottom ends of the No. 1 electric push rod 71 and the No. 2 electric push rod 72 are rigidly fixed to the two sides of the space of the electric-controlled permanent magnetic chuck 1 respectively.

[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 No. 1 electric push rod 71 and the No. 2 electric push rod 72 and corresponds to the empty position of the lower electric-controlled permanent magnetic suction cup 1 for the drill bit to pass through.

[0035] 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 No. 1 electric push rod 71 and the No. 2 electric push rod 72 and the outer tube 3 of the electric push rod are respectively fixed in the housing 8. The housing 8 and the components integrated therein together constitute the magnetic drilling head 81. The double electric push rod 27 can make the main drilling head 81 move back and forth electrically relative to the bottom surface of the electric-controlled permanent magnetic suction cup to approach or move away, thereby forming the electric feeding frame of the magnetic drilling. When the magnetic drilling head 81 approaches the bottom surface of the electric-controlled permanent magnetic suction cup 1, the feeding function of the drilling machine can be realized; when the magnetic drilling head 81 moves away from the bottom surface of the electric-controlled permanent magnetic suction cup 1, the retracting and returning function of the drilling machine can be realized.

[0036] The two electric push rods No. 1 electric push rod 71 and No. 2 electric push rod 72 of the double electric push rod 27 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 inner tube 2 can slide together and move relatively straightly 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 lead screw nut pair for longitudinal transmission. The threaded part of the lead screw can rotate along its axis to enter or exit the inner cavity of the inner tube 2 of the electric push rod. Optimally: the axes of the two electric push rods No. 1 electric push rod 71 and No. 2 electric push rod 72 are in the same plane as the torque output shaft axis 24, and are parallel to each other and symmetrically located on both sides of the torque output shaft axis 24 of the drilling reduction motor.

[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 filings and is easy to clean.

[0038] The outer tube 3 of each of the first electric push rod 71 and the second 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 part is a part of the housing 8 and slides with the outer wall of the inner tube 2 to have the function of the outer tube of the electric push rod.

[0039] It also includes a drive control circuit 10 arranged in the housing 8, wherein the drive control circuit 10 includes a main control unit with an MCU, a DC / DC converter for powering the main control unit, and a battery power detection unit for power management, and 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 double electric push rod 27 are electrically connected to the corresponding parts in the drive control circuit 10. The drive control circuit 10 can be arranged on a circuit board, or it can be dispersed on different circuit boards to form functional module boards of various parts, which is conducive to dispersed installation, making full use of the dispersed space in the housing 8, and miniaturizing the machine head 81.

[0040] The drive control circuit 10 uses the battery 9 stored in the housing 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 be fed back 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 position, 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 taken out due to sudden shutdown when the battery is low.

[0042] It also includes a human-machine interface board 11 placed on the top of the casing 8 and electrically connected to the drive control circuit 10, on which a switch group 12 and a display screen 13 are provided. By manually operating the corresponding switches of the switch group 12, the main control unit of the drive control circuit 10 is set to set the drilling program parameters and operate the magnetic drill. The setting status, execution process and remaining battery power are displayed by the display screen 13 on the switch panel. The drilling speed and drilling depth can be preset according to work needs, and automatically return and stop after reaching the preset value to achieve automated drilling. It is also possible to preset the program inside the drive control circuit 10 so that the number of revolutions and direction of the drilling reduction motor and the feed amount and direction of the dual electric push rod 27 are in a preset parameter ratio relationship, thereby becoming an optimal preset operation menu. Furthermore, under the premise that the strength of the magnetic drill body can be tolerated, the function of the power screw machine is realized.

[0043] Figure 3The number and layout of switches in the switch group 12 are shown for illustration only 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 space 20 near the upper part, so that the upper part of the housing forms a handle 21, and a cavity is provided in the handle 21, and the cavity can accommodate the battery 9 in a fixed or pluggable manner. Preferably, the battery 9 is pluggable and accommodated in the housing, so that at a work site without mains electricity, when a set of batteries is insufficient in capacity, a spare battery can be conveniently replaced to allow the work to continue.

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

[0047] The closing or releasing of the electric-controlled permanent magnetic chuck 1 can be triggered by the corresponding switch of the switch group 12, and the closing switch 191 and the releasing switch 192 can be directly led out from the magnetization drive part in the drive control circuit 10, and the closing or releasing of the electric-controlled permanent magnetic chuck 1 can be directly triggered by the closing switch 191 or the releasing switch 192. The two switches can be set at a convenient position on the housing 8. In this embodiment, the installation position of the two switches is set at the lower part of the handle 20, which is convenient for operation during drilling positioning. This position is only for demonstration and is not a limitation of the present invention.

[0048] This embodiment also provides an external DC power socket 22, which is electrically connected to the power supply line of the drive control circuit 10. When there is a mains power line and a large number of drilling operations are required, an external DC power supply can be connected to continuously power the magnetic drill, and the battery 9 can also be charged during the drilling interval, which is helpful to make up for the limited power of the battery 9. The DC power socket 22 is only a configuration option and is not a limitation of the present invention.

[0049] See attached Figure 5 , Attachment Figure 6As shown, the electric-controlled permanent magnetic chuck 1 has a transparent space above and below, and the space makes the plane shape of the electric-controlled permanent magnetic chuck 1 a closed ring. The electric-controlled permanent magnetic chuck 1 is composed of a magnetic pole shoe ring 15, a No. 1 reversible permanent magnet 17, a No. 1 strong permanent magnet 18, a magnetizing coil 19, and a bottom magnetic ring 16. The No. 1 reversible permanent magnet 17 and the No. 1 strong permanent magnet 18 can be an integral ring or can be spliced ​​into a ring with multiple pieces; the magnetizing coil 19 is sleeved on the outside of the magnetic pole shoe ring 15 and the inside of the No. 1 reversible permanent magnet 17, the No. 1 strong permanent magnet 18 is at the bottom of the magnetizing coil 19, the bottom magnetic ring 16 is at the bottom of the No. 1 reversible permanent magnet 17 and sleeved on the outside of the No. 1 strong permanent magnet 18, and the magnetic potential direction of the No. 1 strong permanent magnet 18 is a radial polar coordinate radiation distribution.

[0050] When the magnetizing drive unit in the drive control circuit 10 adds a positive magnetizing current pulse to the magnetizing 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. Figure 6 As shown by the dotted line in the middle, the residual magnetic flux of the No. 1 reversible permanent magnet 17 and the No. 1 strong permanent magnet 18 are collected and superimposed in parallel by the outer magnetic conductive ring 16 under the action of their respective magnetic potentials, and a magnetic circuit is formed through the ferromagnetic workpiece 26-the magnetic conductive pole shoe ring 15. At this time, the magnetizing coil 19 does not need to be energized any more, and the electrically controlled permanent magnetic suction cup 1 can firmly attract the workpiece, and the drilling rig can perform drilling operations.

[0051] The drill chuck 25 and the workpiece 26 in the accompanying drawings are only provided for convenience in explaining the principle of the present invention and are not intended to be the specific contents of the present invention.

[0052] See attached Fig. 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, so that the first reversible permanent magnet 17 is first demagnetized and then reversely magnetized. Fig. 9 As shown by the middle dotted line, at this time, the direction of the residual magnetic potential of the reversible permanent magnet No. 17 is consistent with the direction of the magnetic potential of the strong permanent magnet No. 18. Under the action of the magnetic potential of the reversible permanent magnet No. 17, the residual magnetism of the strong permanent magnet No. 18 passes through the magnetic pole shoe ring 15 and the outer magnetic 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 suction cup 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 coercive force, 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 No. 1 reversible permanent magnet 17 refers to the No. 1 reversible permanent magnet 17 material, whose coercive force is smaller than the coercive force of the No. 1 strong permanent magnet 18 material, which is only a fraction or a dozen of the latter. The materials of the No. 1 reversible permanent magnet 17 include manganese aluminum carbon, aluminum nickel cobalt or iron chromium cobalt. The materials of the No. 1 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 positive pulse current flows through the magnetizing coil 19, its magnetizing potential is greater than the coercive force of the reversible permanent magnet 17, which can magnetize the reversible permanent magnet 17 in a positive direction, and when a reverse pulse current flows through the magnetizing coil 19, the reversible permanent magnet 17 can be demagnetized first and then magnetized in a reverse direction. Here, the electrical parameter value of the positive or reverse magnetizing current pulse passed through the magnetizing coil 19 is set to an electrical parameter value that the magnetizing potential generated by it can only magnetize, demagnetize, and reverse magnetize the reversible permanent magnet 17 in a positive 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 a closed ring with a hollow middle part due to the hollow core in the middle part of the magnetic pole shoe ring 15. The hollow in the middle 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 part of the magnetic pole shoe ring 15 has an eaves ring extending outward, which can provide magnetic conductivity for the No. 1 reversible permanent magnet 17 and is also used for fixed connection with the bottom of the double electric push rod 27. The No. 1 reversible permanent magnet 17 and the No. 1 strong permanent magnet 18 can be an integral ring, and in order to reduce costs, they can also be spliced ​​into a ring with multiple rectangular or arc-shaped pieces. When the No. 1 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 reason why the No. 1 reversible permanent magnet 17 is arranged at the radial outer ring of the magnetic suction cup is that the outer ring has a large circumference and can be arranged with more reversible permanent magnets, which is beneficial to increase the total magnetic flux of the magnetic suction cup in the attracted state and to obtain a greater magnetic attraction. Compared with the reversible permanent magnet being arranged at the inner ring, the magnetic pole shoe ring 15 is arranged at the inner ring, which has the advantages of less magnetic leakage, less adsorption of broken iron filings, and is convenient for cleaning.

[0057] The present invention reduces the rigidity requirement of the frame and simplifies the structure from the overall structural layout. Under the premise of ensuring the quality of drilling, the materials used are small in size and light in weight, thus achieving the purpose of easy carrying and high-position lifting, reducing the labor intensity of operation and high safety. In addition, the built-in electromechanical automatic feeding system makes it possible to drill holes in special occasions (such as suspended, high-position, and supine positions) where manual control and force drilling operations are inconvenient.

[0058] Example 2

[0059] Referring to Example 1, the feature of the invention 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 electric-controlled permanent magnetic chuck 1 described in this embodiment is left with a hollow with an opening that is transparent from top to bottom. Due to the hollow, the plane shape of the electric-controlled permanent magnetic chuck 1 is an open ring with an opening on one side. The electric-controlled permanent magnetic chuck 1 consists of a magnetic cover 151, a reversible permanent magnet No. 2 171, a strong permanent magnet No. 2 181, a magnetizing coil 19, and a bottom magnetic strip 161. The reversible permanent magnet No. 2 171 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 No. 2 171, the strong permanent magnet No. 2 181 is at the bottom of the magnetizing coil 19, the bottom magnetic strip 161 is at the bottom of the reversible permanent magnet No. 2 171 and in the middle of the strong permanent magnet No. 2 181, the magnetic potential direction of the reversible permanent magnet No. 2 171 is longitudinal, the magnetic potential direction of the strong permanent magnet No. 2 181 is transverse, and the two sides have the same polarity relative to the bottom magnetic strip 161.

[0061] See attached Figure 8 When the magnetizing drive unit in the drive control circuit 10 adds a positive magnetizing electric pulse to the magnetizing 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, and the direction of the residual magnetic potential is opposite to the direction of the magnetic potential 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 No. 2 171 and the strong permanent magnet No. 2 181 are collected and superimposed in parallel by the bottom magnetic strip 161, and a magnetic circuit is formed through the ferromagnetic workpiece 26 - the magnetic pole shoe ring 151. At this time, the magnetizing coil 19 does not need to be powered on any more, and the electric-controlled permanent magnetic suction cup 1 can firmly attract the workpiece, and the drilling rig can perform drilling operations.

[0062] See attached Fig.10When the workpiece 26 needs to be released, the magnetizing drive unit in the drive control circuit 10 adds a reverse magnetizing current pulse to the magnetizing coil 19, so that the reversible permanent magnet 171 is first demagnetized and then reversely magnetized. At this time, the residual magnetic potential direction of the reversible permanent magnet 171 is consistent with the magnetic potential direction 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, and its magnetic lines of force are shown in the attached figure. Fig.10 The dotted line in the middle 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 take it away.

[0063] The materials of the magnetic cover 151 and the bottom magnetic strip 161 are soft magnetic materials with low coercive force, 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 No. 2 171 refers to the reversible permanent magnet No. 2 171 material, which has a smaller coercive force than the strong permanent magnet No. 2 181 material, and is only a fraction or a dozen of the latter. The materials of the reversible permanent magnet No. 2 171 include manganese aluminum carbon, aluminum nickel cobalt or iron chromium cobalt. The materials of the strong permanent magnet No. 2 181 include permanent ferrite, samarium cobalt or neodymium iron boron, and the coercive force ranges from 600 to 2000 kA / m. When a positive pulse current flows through the magnetizing coil 19, its magnetizing potential is greater than the coercive force of the reversible permanent magnet No. 2 171, and the reversible permanent magnet No. 2 171 can be magnetized in the positive direction. When a reverse pulse current flows through the magnetizing coil 19, the reversible permanent magnet No. 2 171 can be demagnetized first and then magnetized in the reverse direction. Here, the electrical parameter value of the positive or reverse magnetizing current pulse passed through the magnetizing coil 19 is set to an electrical parameter value that the magnetizing potential generated by it can only magnetize, demagnetize, and reverse magnetize the reversible permanent magnet No. 2 171 in the positive direction, and is not enough to produce a demagnetization effect on the strong permanent magnet No. 2 181.

[0064] The plane shape of the magnetic cover 151 in this embodiment is an open ring (U or C shape), and the bottoms of the two inner tubes 2 of the dual electric push rod 27 are rigidly fixed to the two ends of the open ring of the magnetic cover 151, and the lower part between the two inner tubes 2 corresponds to the empty position, and the hole allows the drill to pass through. The advantage of using an open ring is that when drilling positioning, the center alignment of the drill can be observed through the opening, and after the drilling is completed, it is convenient to clean iron filings through the opening.

[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 upper, lower, vertical and horizontal directions described in this specification are only for the convenience of explanation and understanding. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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), the electric-controlled permanent magnetic suction cup (1) having upper and lower transparent spaces for the drill bit to pass through; the double electric push rod (27) is composed of two electric push rods, namely, a No. 1 electric push rod (71) and a No. 2 electric push rod (72), the two axes and the telescopic directions of the No. 1 electric push rod (71) and the No. 2 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 No. 1 electric push rod (71) and the No. 2 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 suction cup (1), and the position is between the axes of the first electric push rod (71) and the second electric push rod (72) and corresponds to the empty position of the lower electric-controlled permanent magnetic suction cup (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 No. 1 electric push rod (71) and the No. 2 electric push rod (72) and the outer tube (3) of the electric push rod are respectively fixed in the casing (8), and the casing (8) and the components integrated therein together constitute a magnetic drilling head (81), and the double electric push rod (27) can make the main drilling head (81) move reciprocatingly and electrically toward or away from the bottom surface of the electric-controlled permanent magnetic suction cup, 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 double electric push rods (27) are electrically connected to corresponding units in the drive control circuit (10) respectively; The drive control circuit (10) uses a battery (9) stored in a battery storage 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 suction cup (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, characterized in that: The two electric push rods of the double electric push rod (27), namely the first electric push rod (71) and the second electric push rod (72), have the same structure and electromechanical parameters, and each comprises its own servo reduction motor (7), an outer tube (3), an inner tube (2), a lead screw (6) and a 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 along 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, the first electric push rod (71) and the second electric push rod (72), are in the same plane as the axis of the torque output shaft (24) and are symmetrically located on both sides of the axis of the torque output shaft (24) in parallel with each other.

3. The portable automatic magnetic drill according to claim 1, characterized in that The invention also comprises 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 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.

5. The portable automatic magnetic drill according to claim 4, characterized in that The electric-controlled permanent magnetic chuck (1) with a closed ring-shaped plane is composed of a magnetic pole shoe ring (15), a No. 1 reversible permanent magnet (17), a No. 1 strong permanent magnet (18), a magnetizing coil (19), and a bottom magnetic ring (16). The No. 1 reversible permanent magnet (17) and the No. 1 strong permanent magnet (18) can be 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 No. 1 reversible permanent magnet (17). The No. 1 strong permanent magnet (18) is at the bottom of the magnetizing coil (19). The bottom magnetic ring (16) is at the bottom of the No. 1 reversible permanent magnet (17) and sleeved on the outside of the No. 1 strong permanent magnet (18). The magnetic potential direction of the No. 1 reversible permanent magnet (17) is longitudinal, and the magnetic potential direction of the No. 1 strong permanent magnet (18) is radial polar coordinate radiation distribution.

6. The portable automatic magnetic drill according to claim 1, characterized in that The electrically controlled permanent magnetic chuck (1) has a space with an opening that is 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.

7. The portable automatic magnetic drill according to claim 6, characterized in that The electrically controlled permanent magnetic chuck (1) is in the shape of an open ring with an opening on one side and is composed of a magnetic cover (151), a second reversible permanent magnet (171), a second strong permanent magnet (181), a magnetizing coil (19), and a bottom magnetic strip (161). The second reversible permanent magnet (171) is located at the top of the inner cavity of the magnetic cover (151). The magnetizing coil (19) is sleeved on the second reversible permanent magnet. (171), the second strong permanent magnet (181) is at the bottom of the magnetizing coil (19), the bottom magnetic conductive strip (161) is at the bottom of the second reversible permanent magnet (171) and in the middle of the second strong permanent magnet (181), the magnetic potential direction of the second reversible permanent magnet (171) is longitudinal, and the magnetic potential direction of the second strong permanent magnet (181) is transverse and has the same polarity relative to the bottom magnetic conductive strip (161).

8. The portable automatic magnetic drill according to claim 2, characterized in that The outer tubes (3) of the two electric push rods (27), namely the first electric push rod (71) and the second electric push rod (72), are directly integrally formed at the corresponding position of the casing (8), that is, the position is both a part of the casing (8) and slidably cooperates with the outer wall of the corresponding inner tube (2) so as to have the function of the outer tube of the electric push rod.

9. 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 section in the drive control circuit (10); the pull-in switch (191) is used to directly control the pull-in of the electric-controlled permanent magnetic chuck (1); and the release switch (192) is used to directly control the release of the electric-controlled permanent magnetic chuck (1).

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

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