A magnetic drill for improving drilling accuracy

Abstract

The present application discloses a magnetic drill for improving drilling accuracy, comprising a magnetic base, a main unit fixedly connected to the magnetic base, a slide seat installed at the main unit, an electric drill unit installed at the slide seat, and a driving unit installed at the main unit and capable of controlling the sliding of the slide seat; the driving unit comprises a rotating shaft, a rotating block fixed at the rotating shaft, and a rotating rod fixed at the rotating block, a rotating sleeve that rotates synchronously with the rotating shaft is fixed at the rotating shaft, and a rotating abutment block is fixed at the rotating sleeve; a fixed base plate is fixed at the main unit, a rotating annular plate that can rotate is installed at the fixed base plate, an arc scale plate is fixed at the rotating annular plate, a marking slide seat that can slide along the arc scale plate is provided at the arc scale plate, and the rotating abutment block can abut against the marking slide seat. The magnetic drill of the present application can realize the switching of drilling modes and achieve high-precision drilling.

Description

Technical Field

[0001] The present application relates to the field of machining, and in particular to a magnetic drill for improving drilling accuracy. Background Art

[0002] The difference between a magnetic drill and an ordinary electric drill is that a magnetic drill has a magnetic base, which can be adsorbed on the surface of the drilled part through the magnetic base, thereby providing a stable foundation and facilitating the drilling operation of the electric drill. In addition, the magnetic drill has a handle rod, which can drive the drilling depth of the electric drill. The activation of the adsorption characteristics of the magnetic base and the drilling operation of the electric drill are controlled separately. In the existing magnetic drill, after the electromagnet is energized and fixed by the magnetic base, the electric drill is turned on, and then the operator often manually drives the handle to lower the drill bit to drill the object to be processed. Under normal circumstances, it can meet the use requirements, because there is no requirement for the accuracy of drilling, and generally the object to be processed needs to be drilled through, so there can be a certain error in the amplitude of the drill bit's descent. However, in some cases, such as drilling, the workpiece does not need to be drilled through, but a blind hole of a specific depth needs to be drilled. Alternatively, although the workpiece is drilled through, there are other parts very close to the bottom of the workpiece that cannot be touched by the drill. At this time, manual operation is very arbitrary and it is easy to drill too deep or damage other parts. Summary of the invention

[0003] Purpose of the invention: This application aims to overcome the defects of the prior art and to provide a magnetic drill that is convenient for improving the drilling accuracy of a magnetic drill.

[0004] Technical solution: A magnetic drill comprises a magnetic base, a main unit fixedly connected to the magnetic base, a slide installed on the main unit, an electric drill unit installed on the slide, and a driving unit installed on the main unit and capable of controlling the sliding of the slide; the driving unit comprises a rotating shaft, a rotating block fixed on the rotating shaft, and a rotating rod fixed on the rotating block, a rotating sleeve that rotates synchronously with the rotating shaft is fixed on the rotating shaft, and a rotating abutment block is fixed on the rotating sleeve; a fixed base plate is fixed on the main unit, a rotatable rotating annular plate is installed on the fixed base plate, an arc-shaped scale plate is fixed on the rotating annular plate, a marking slide that can slide along the arc-shaped scale plate is provided on the arc-shaped scale plate, and the rotating abutment block can abut against the marking slide.

[0005] Furthermore, the driving unit is a manual driving unit.

[0006] Furthermore, the fixed base plate has an annular groove surrounding the rotating annular plate, the marking slide includes a first slide, a second slide, a connecting seat connecting the first slide and the second slide, a first slide fixedly connected to the first slide, and a second slide fixedly connected to the second slide, the first slide has a limiting groove matching the arc scale plate, the second slide is fixed with a limiting slider matching the annular groove, the first slide has a first locking bolt whose end can abut the arc scale plate, and the second slide has a first locking bolt whose end can abut the A second locking bolt is provided to fix the base plate, a first fixed shaft is also fixed to the rotating annular plate, a rotating seat is installed on the first fixed shaft, a first end limit plate is provided at the top end of the first fixed shaft, an annular abutment plate surrounding the first fixed shaft is provided at the first fixed shaft, a compression spring surrounding the first fixed shaft and located between the annular abutment plate and the first end limit plate is provided at the first fixed shaft, a first limit through-hole is provided at the rotating seat through which the first fixed shaft passes, the rotating seat can abut against the rotating abutment block, and the rotating seat can abut against the end of the arc scale plate.

[0007] Furthermore, the cross section of the annular chute is T-shaped.

[0008] Furthermore, the surface of the annular abutting plate abutting against the rotating seat has an anti-slip pad, the cross section of the arc-shaped scale plate is T-shaped, and the cross sections of the limiting sliding groove and the limiting sliding block are both T-shaped.

[0009] Therefore, the sliding parts are precisely matched and will not fall off from each other.

[0010] Furthermore, the arc-shaped scale plate has marking scales distributed in an arc shape.

[0011] Furthermore, the marking scale corresponds to the descent height of the electric drill.

[0012] This makes it easier to adjust the positioning.

[0013] Furthermore, a first knob is fixed to the first locking bolt, a second knob is fixed to the second locking bolt, a limiting sleeve is fixed to the second slide, and the marking slide has a threaded channel that penetrates the limiting sleeve and the second slide and cooperates with the second locking bolt.

[0014] Therefore, due to the existence of the limiting sleeve, the length of the threaded channel is lengthened, so that the first locking bolt is more stable when locked.

[0015] Furthermore, the marking slide has a receiving groove, the receiving groove has a second fixed shaft and a rotating pad, the end of the second fixed shaft has a second end limit plate, and the rotating pad has a second limit through-hole passed by the second fixed shaft; the rotating pad has a protrusion, the rotating seat has a blind hole, a pressure sensor that can be pressed by the protrusion is installed in the blind hole, and a control unit and an indicator light are installed on the host, the control unit can control the magnetic seat drill to be in a precise drilling mode, in the precise drilling mode, when the measured value of the pressure sensor is greater than or equal to a set threshold value, the control unit controls the indicator light to light up; the rotating seat can be in a first position and a second position. position, when the rotating seat is in the first position, the rotating seat can abut against the first sliding seat and can abut against the rotating abutment block; when the rotating seat is in the second position, the rotating seat can abut against the second sliding seat and cannot abut against the rotating abutment block; the rotating pad can be in the third position and the fourth position, when the rotating pad is in the third position, the rotating pad is located in the accommodating groove, and the rotating abutment block can abut against the rotating pad; when the rotating pad is in the fourth position, the rotating abutment block can abut against the surface of the accommodating groove; when the rotating pad is in the fourth position and the rotating seat is in the second position, the protrusion can be inserted into the blind hole and press the pressure sensor.

[0016] Furthermore, when the rotating seat is in the first position, the rotating seat abuts against the end of the arc-shaped marking plate.

[0017] Furthermore, the protrusion includes a cylindrical part and a hemispherical part connected to the cylindrical part; when the rotating pad is in the third position, the length direction of the rotating pad is parallel to the fixed substrate; when the rotating pad is in the fourth position, the length direction of the rotating pad is perpendicular to the fixed substrate.

[0018] Furthermore, the marking slide is provided with two elastic abutment plates whose ends abut against the rotating pad, the surface of the elastic abutment plates abutting against the rotating pad has an anti-slip pad, and the elastic abutment plates include a first flat plate fixed to the marking slide, a second flat plate abutting against the rotating pad, and an arc-shaped connecting plate connecting the first flat plate and the second flat plate.

[0019] Furthermore, there are three rotating rods which are distributed in a circular shape with equal intervals, and the ends of the rotating rods are provided with handles.

[0020] Furthermore, the host also has a handle unit.

[0021] This makes it easier to grip the magnetic drill for transport.

[0022] Furthermore, the host has a control panel, which has a speed control knob, an electric drill unit on / off button, and a magnetic base on / off button; the indicator light is installed on the control panel, and the control panel is also equipped with a switching button for turning on the precise drilling mode.

[0023] Thus, it is possible to switch between the normal drilling mode and the precise drilling mode, so that a reminder of the correctness of the operation can be given in the precise drilling mode.

[0024] Furthermore, a first Bluetooth device may be installed in the host; the end of the rotating base has a cover, and the rotating base has an installation space, in which a battery, a microprocessor and a second Bluetooth device communicating with the first Bluetooth device are installed.

[0025] This arrangement can avoid complicated wiring at the rotating seat. The pressure sensor at the rotating seat can be powered independently and communicate with the control unit at the host by using Bluetooth.

[0026] Furthermore, the host has a slide rail, the slide seat has a slider matched with the slide rail, the slide seat has a rack, and the rotating shaft is equipped with a gear matched with the rack.

[0027] Furthermore, the gear is installed in the host.

[0028] Furthermore, the electric drill unit includes an electric drill housing, a connecting frame connecting the electric drill housing and a slide seat, a motor installed in the electric drill housing, a drill mounting rod driven by the motor, and a drill bit installed on the drill mounting rod, the drill mounting rod has a socket, the drill bit can be inserted into the socket, and the drill mounting rod has a drill locking bolt that locks the relative position of the drill mounting rod and the drill bit.

[0029] Furthermore, the surface of the rotating backing plate facing the accommodating groove includes a rectangular portion and a semicircular portion connected to the rectangular portion.

[0030] Furthermore, the fixed base plate has a circular limiting groove, and the rotating annular plate has a circular limiting rail matched with the limiting groove.

[0031] An elastic reset component is installed between the fixed base plate and the rotating annular plate, so that in the absence of external force, the relative position of the rotating annular plate and the fixed base plate is always at the initial position.

[0032] Thus, the elastic reset component enables the rotating annular plate to be in the initial position when not in operation, and does not need to be adjusted every time. In addition, the elastic reset component can also provide a boost when the handle is reset after drilling is completed.

[0033] Furthermore, the rotating annular plate is provided with a third locking bolt, and the third locking bolt can lock the relative position of the rotating annular plate and the fixed base plate.

[0034] Beneficial effects: The magnetic drill of the present application can be used as an ordinary magnetic drill, is easy to use, and has multiple handles for conveniently adjusting and controlling the drilling depth of the electric drill.

[0035] In addition, the magnetic drill of the present application also provides a precise drilling mode, so that when drilling a hole of a specific depth, or in order to avoid over-drilling, the drilling depth can be precisely controlled, and the special structure setting makes it less likely for the operator to make mistakes or over-drilling when drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the magnetic drill in the initial state;

[0037] Figure 1A This is an enlarged view of area A;

[0038] Figure 2 It is a schematic diagram of the drill bit abutting against the drilled surface. At this time, the rotating abutment block rotates at a certain angle, the rotating abutment block abuts against the rotating seat, and the rotating seat abuts against the rotating pad;

[0039] Figure 3 Schematic diagram of adjusting the position of the marking slide according to the drilling depth requirements;

[0040] Figure 4 A schematic diagram of rotating the rotating annular plate to the position of the marking slide;

[0041] Figure 5 A schematic diagram of a flip rotating seat;

[0042] Figure 6 A schematic diagram of drilling a hole in a marking slide by abutting against a rotating abutment block;

[0043] Figure 7 A schematic diagram of rotating the rotating seat and the rotating pad;

[0044] Figure 8 A schematic diagram of the protrusion abutting against the pressure sensor and the rotating abutment block abutting against the accommodating groove;

[0045] Fig. 9 A schematic diagram for marking the separation of the slide;

[0046] Fig. 9A This is an enlarged view of area B. DETAILED DESCRIPTION

[0047] Reference numerals: 1 magnetic base;

[0048] 2 Host; 2.1 Magnetic base on / off button; 2.2 Electric drill on / off button; 2.3 Switch button; 2.4 Indicator light; 2.5 Rotating shaft; 2.5.1 Fixed sleeve; 2.5.2 Rotating abutment block; 2.6 Rotating block; 2.7 Rotating rod; 2.8 Handle; 2.9 Slide rail; 2.10 Handle unit;

[0049] 3 slide seat; 3.1 electric drill unit; 3.2 drill mounting rod; 3.3 drill; 3.4 drill locking bolt; 3.5 connecting frame;

[0050] 4 marked slide seat; 4.1 first slide seat; 4.1.1 limit slide groove; 4.2 second slide seat; 4.2.1 limit slide block; 4.3 connecting seat; 4.3.1 accommodating groove; 4.3.2 rotating pad; 4.3.2.1 protrusion; 4.3.3 second end limit plate; 4.3.4 elastic abutment sheet; 4.3.4.1 arc-shaped connecting plate; 4.4 first slide plate; 4.4.1 first locking bolt; 4.5 second slide plate; 4.5.1 limit sleeve; 4.5.2 second locking bolt;

[0051] 5 rotating seat; 5.1 cover; 5.2 blind hole;

[0052] 6 fixed base plate; 6.1 circular slide groove;

[0053] 7 rotating annular plate; 7.1 arc-shaped scale plate; 7.2 scale; 7.3 first fixed axis; 7.4 compression spring; 7.5 first end limit block; 7.6 annular abutment plate.

[0054] The following is a specific description in conjunction with the accompanying drawings: A magnetic drill for improving drilling accuracy, comprising a magnetic base 1, a main unit 2 fixedly connected to the magnetic base 1, a slide 3 installed at the main unit 2, an electric drill unit 3.1 installed at the slide 3, and a driving unit installed at the main unit 2 and capable of controlling the sliding of the slide 3; the driving unit comprises a rotating shaft 2.5, a rotating block 2.6 fixed at the rotating shaft 2.5, and a rotating rod 2.7 fixed at the rotating block 2.6, and the rotating shaft 2.5 is fixed with A rotating sleeve 2.5.1 rotates synchronously with the rotating shaft 2.5, and a rotating abutment block 2.5.2 is fixed to the rotating sleeve 2.5.1; a fixed base plate 6 is fixed to the main machine 2, and a rotatable rotating annular plate 7 is installed on the fixed base plate 6, and an arc scale plate 7.1 is fixed to the rotating annular plate 7, and the arc scale plate 7.1 has a marking slide 4 that can slide along the arc scale plate 7.1, and the rotating abutment block 2.5.2 can abut against the marking slide 4. The fixed base plate 6 has an annular groove 6.1 surrounding the rotating annular plate 7, the marking slide 4 includes a first slide 4.1, a second slide 4.2, a connecting seat 4.3 connecting the first slide 4.1 and the second slide 4.2, a first slide 4.4 fixedly connected to the first slide 4.1 and a second slide 4.5 fixedly connected to the second slide 4.2, the first slide 4.1 has a limiting groove 4.1.1 matched with the arc scale plate 7.1, the second slide 4.2 is fixed with a limiting slider 4.2.1 matched with the annular groove 6.1, the first slider 4.4 has a first locking bolt 4.4.1 whose end can abut the arc scale plate 7.1, and the second slider The plate 4.5 has a second locking bolt 4.5.2 whose end can abut the fixed base plate 6, and the rotating annular plate 7 is also fixed with a first fixed shaft, and a rotating seat 5 is installed at the first fixed shaft. The top of the first fixed shaft has a first end limit plate 7.5, and the first fixed shaft has an annular abutment plate 7.6 surrounding the first fixed shaft. The first fixed shaft has a compression spring 7.4 surrounding the first fixed shaft and located between the annular abutment plate 7.6 and the first end limit plate 7.5, and the rotating seat 5 has a first limit through-hole passed by the first fixed shaft. The rotating seat 5 can abut the rotating abutment block 2.5.2, and the rotating seat 5 can abut the end of the arc scale plate 7.1.

[0055] The surface of the annular abutment plate 7.6 abutting against the rotating seat 5 has an anti-skid pad, the cross section of the arc scale plate 7.1 is T-shaped, and the cross sections of the limit slide groove 4.1.1 and the limit slide block 4.2.1 are both T-shaped; the arc scale plate 7.1 has arc-shaped marking scales 7.2. The first locking bolt 4.4.1 is fixed with a first knob, the second locking bolt 4.5.2 is fixed with a second knob, the second slide 4.5 is fixed with a limit sleeve 4.5.1, and the marking slide 4 has a threaded channel that penetrates the limit sleeve 4.5.1 and the second slide 4.5 and cooperates with the second locking bolt 4.5.2. The marking slide 4 has a receiving groove 4.3.1, and the receiving groove 4.3.1 has a second fixed shaft and a rotating pad 4.3.2. The end of the second fixed shaft has a second end limit plate 4.3.3, and the rotating pad 4.3.2 has a second limit through-hole passed by the second fixed shaft; the rotating pad 4.3.2 has a protrusion 4.3.2.1, and the rotating seat 5 has a blind hole 5.2, and a pressure sensor that can be pressed by the protrusion 4.3.2.1 is installed in the blind hole 5.2. The host 2 is installed with a control unit and an indicator light 2.4, and the control unit can control the magnetic base drill to be in a precise drilling mode. In the precise drilling mode, when the measured value of the pressure sensor is greater than or equal to the set threshold value, the control unit controls the indicator light 2.4 to light up; the rotating seat 5 can be in a first position and a second position. When the rotating seat 5 is in When in the first position, the rotating seat 5 can abut against the first slide 4.1 and can abut against the rotating abutment block 2.5.2; when the rotating seat 5 is in the second position, the rotating seat 5 can abut against the second slide 4.2 and cannot abut against the rotating abutment block 2.5.2; the rotating pad 4.3.2 can be in the third position and the fourth position. When the rotating pad 4.3.2 is in the third position, the rotating pad 4.3.2 is located in the accommodating groove, and the rotating abutment block 2.5.2 can abut against the rotating pad 4.3.2; when the rotating pad 4.3.2 is in the fourth position, the rotating abutment block 2.5.2 can abut against the surface of the accommodating groove 4.3.1; when the rotating pad 2.5.2 is in the fourth position and the rotating seat is in the second position, the protrusion 4.3.2.1 can be inserted into the blind hole 5.2 and press the pressure sensor.

[0056] The protrusion 4.3.2.1 includes a cylindrical part and a hemispherical part connected to the cylindrical part; when the rotating pad 4.3.2 is in the third position, the length direction of the rotating pad 4.3.2 is parallel to the fixed base plate 6; when the rotating pad 4.3.2 is in the fourth position, the length direction of the rotating pad 4.3.2 is perpendicular to the fixed base plate 6. The marking slide 4 is provided with two elastic abutting pieces 4.3.4 whose ends abut against the rotating pad, and the surface of the elastic abutting piece 4.3.4 abutting against the rotating pad has an anti-slip pad, and the elastic abutting piece 4.3.4 includes a first flat plate fixed to the marking slide 4, a second flat plate abutting against the rotating pad, and an arc-shaped connecting plate 4.3.4.1 connecting the first flat plate and the second flat plate. The rotating rods 2.7 are three in number and are distributed in a circular shape with equal spacing. The ends of the rotating rods 2.7 are provided with handles 2.8. The host 2 is provided with a control panel, which is provided with a speed knob, an electric drill unit on / off button 2.2, and a magnetic base on / off button 2.1. The indicator light 2.4 is installed on the control panel, and a switch button 2.3 for turning on the precise drilling mode is also installed on the control panel. The host 2 is provided with a slide rail 2.9, the slide seat 3 is provided with a slider that cooperates with the slide rail 2.9, the slide seat 3 is provided with a rack, and the rotating shaft 2.5 is provided with a gear that cooperates with the rack. The electric drill unit includes an electric drill housing, a connecting frame 3.5 connecting the electric drill housing and the slide 3, a motor installed in the electric drill housing, a drill mounting rod 3.2 driven by the motor, and a drill bit 3.3 installed at the drill mounting rod 3.2, wherein the drill mounting rod 3.2 has a socket into which the drill bit 3.3 can be inserted, and the drill mounting rod 3.2 has a drill locking bolt 3.4 for locking the relative positions of the drill mounting rod 3.2 and the drill bit 3.3.

[0057] As shown in the figure, the magnetic drill of the present application can make the marking slide not in a locked state during normal use, so that it can be used as an ordinary magnetic drill. However, when the drilling accuracy needs to be determined very accurately, the following operations are performed:

[0058] First, turn on the switch button to switch to the precision drilling mode. Only in this mode will the indicator light be lit according to the signal from the pressure sensor. Then follow the steps below: Figure 1 As shown, the magnetic drill is in the initial state; then Figure 2 As shown, when the electric drill is not turned on, the operating handle makes the drill bit of the electric drill contact the surface of the drilled object, at this time, the rotating abutment block and the rotating annular plate are rotated to a certain angle; then as shown in FIG. Figure 3As shown, the rotating annular plate is kept stationary, and the sliding mark slide slides to the specified position (the specified position is determined according to the depth of the drill hole. Since there is a corresponding relationship between the rotation angle of the rotating shaft and the descending height of the electric drill, the scale at the arc scale plate can be a length scale, and the length scale directly corresponds to the descending height of the electric drill). After the adjustment is completed, the second locking bolt is locked (the first locking bolt is not locked at this time); then as Figure 4 As shown, the rotating annular plate is rotated so that the rotating seat abuts against the rotating pad plate to lock the first locking bolt; then as Figure 5 As shown, flip the rotating seat; then Figure 6 As shown, turn on the electric drill and operate the electric drill to descend until the rotating abutment block abuts against the rotating pad; then Figure 7 As shown, the shaft is reset. At this time, the drilling depth can be measured visually or with tools. In theory, the drilling depth is a little short of the desired drilling depth. Figure 8 In the state shown, the hole will be drilled to the required depth only when the abutment block is rotated to abut the accommodating groove. The reason why this check is needed is that, theoretically, the drilling depth is still a little short of the mark during this check. It is a confirmation operation to confirm that the position marked by the marking slide is correct. Because if the depth is a little short of the mark, you can drill again. If the hole is over-drilled, it cannot be compensated. Therefore, this inspection and confirmation step is to prevent the situation where there is an error in the marking of the marking slide (the error is generally not too large when the operator sets the position of the marking slide). In case of an error, the operation can be repeated to remedy the situation. If there is no problem with the drilling depth checked in this step, then proceed to the next step. Figure 8 As shown, fold the rotating seat and the rotating pad so that the protrusion abuts the pressure sensor, and the indicator light is on (this is also a confirmation step. Therefore, after drilling this time, the drilling depth is theoretically better than the requirement. The indicator light is on to remind the operator that the operation is correct and to avoid forgetting to flip the rotating pad, etc.), operate the electric drill to lower the drilling, and rotate the abutment block to abut the surface of the accommodating groove, so that the hole is drilled to the required depth. Therefore, the above operation makes the drilling more accurate and can avoid excessive drilling caused by the positioning error of the operator on the marking slide. The scale of the arc scale plate can be set by the technician according to the corresponding relationship between the rotation angle of the shaft and the sliding distance of the electric drill, and the dimensions of the rotating seat, the marking slide and the rotating pad need to be considered for calibration. In theory, the scale of the scale corresponds to the depth of the drilling when the rotating abutment block abuts the rotating pad. For example, the side of the marking slide away from the rotating seat is taken as the reference plane. When the scale of the arc scale plate corresponding to the reference plane is 25mm, then in Figure 8 When the indicator light is on, the drilling depth of the electric drill is exactly 25mm. Figure 6In the state shown, the depth of the drilling is slightly less than 25 mm, so the scale is set in this way to make the operation more convenient for the operator.

[0059] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A magnetic drill that is convenient for improving drilling accuracy. It is characterized in that It includes a magnetic base, a main machine fixedly connected to the magnetic base, a slide seat installed on the main machine, an electric drill unit installed on the slide seat, and a driving unit installed on the main machine and capable of controlling the sliding of the slide seat; the driving unit includes a rotating shaft, a rotating block fixed on the rotating shaft, and a rotating rod fixed on the rotating block, a rotating sleeve that rotates synchronously with the rotating shaft is fixed on the rotating shaft, and a rotating abutment block is fixed on the rotating sleeve; a fixed base plate is fixed on the main machine, a rotating circular plate that can rotate is installed on the fixed base plate, an arc scale plate is fixed on the rotating circular plate, a marking slide seat that can slide along the arc scale plate is provided on the arc scale plate, and the rotating abutment block can abut against the marking slide seat; the fixed base plate has a rotating ring plate that surrounds the rotating ring plate The cam is an annular groove of the plate, the marking slide comprises a first slide, a second slide, a connecting seat connecting the first slide and the second slide, a first slide fixedly connected to the first slide and a second slide fixedly connected to the second slide, the first slide has a limiting slide groove matching the arc scale plate, the second slide is fixed with a limiting slide block matching the annular groove, the first slide has a first locking bolt whose end can abut against the arc scale plate, the second slide has a second locking bolt whose end can abut against the fixed base plate, the rotating annular plate is also fixed with a first fixed shaft, the first fixed shaft is installed with a rotating seat, the top of the first fixed shaft has a first end limiting plate, the first fixed shaft has a An annular abutment plate surrounding the first fixed shaft, the first fixed shaft has a compression spring surrounding the first fixed shaft and located between the annular abutment plate and the first end limit plate, the rotating seat has a first limit through-hole passed by the first fixed shaft, the rotating seat can abut the rotating abutment block, and the rotating seat can abut the end of the arc-shaped scale plate; the marking slide has a receiving groove, the receiving groove has a second fixed shaft and a rotating pad, the end of the second fixed shaft has a second end limit plate, the rotating pad has a second limit through-hole passed by the second fixed shaft; the rotating pad has a protrusion, the rotating seat has a blind hole, a pressure sensor that can be pressed by the protrusion is installed in the blind hole, and the host has a A control unit and an indicator light are installed, the control unit can control the magnetic drill to be in a precise drilling mode, in the precise drilling mode, when the measured value of the pressure sensor is greater than or equal to the set threshold value, the control unit controls the indicator light to light up; the rotating seat can be in a first position and a second position, when the rotating seat is in the first position, the rotating seat can abut against the first sliding seat and can abut against the rotating abutment block; when the rotating seat is in the second position, the rotating seat can abut against the second sliding seat and cannot abut against the rotating abutment block; the rotating pad can be in a third position and a fourth position, when the rotating pad is in the third position, the rotating pad is located in the accommodating groove, and the rotating abutment block can abut against the rotating pad;When the rotating pad is in the fourth position, the rotating abutment block can abut the surface of the accommodating groove; when the rotating pad is in the fourth position and the rotating seat is in the second position, the protrusion can be inserted into the blind hole and press the pressure sensor. ; 2. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that The surface where the annular abutment plate abuts against the rotating seat has an anti-slip pad, the cross-section of the arc-shaped scale plate is T-shaped, and the cross-sections of the limiting slide groove and the limiting slider are both T-shaped; the arc-shaped scale plate has arc-shaped marking scales.

3. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that A first knob is fixed to the first locking bolt, a second knob is fixed to the second locking bolt, a limiting sleeve is fixed to the second slide plate, and the marking slide seat has a threaded channel that penetrates the limiting sleeve and the second slide plate and cooperates with the second locking bolt.

4. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that The protrusion includes a cylindrical portion and a hemispherical portion connected to the cylindrical portion; when the rotating pad is in the third position, the length direction of the rotating pad is parallel to the fixed base plate; When the rotating pad is at the fourth position, the length direction of the rotating pad is perpendicular to the fixed base plate.

5. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that The marking slide is provided with two elastic abutment plates whose ends abut against the rotating pad, the surface of the elastic abutment plates abutting against the rotating pad has an anti-slip pad, and the elastic abutment plates include a first flat plate fixed to the marking slide, a second flat plate abutting against the rotating pad, and an arc-shaped connecting plate connecting the first flat plate and the second flat plate.

6. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that There are three rotating rods, which are distributed in a circular shape with equal intervals, and the ends of the rotating rods are provided with handles; the main unit is provided with a control panel, and the control panel has a speed adjustment knob, an electric drill unit on / off button, and a magnetic base on / off button; the indicator light is installed on the control panel, and the control panel is also provided with a switching button for turning on the precise drilling mode.

7. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that The host is provided with a slide rail, the slide seat is provided with a slider matched with the slide rail, the slide seat is provided with a rack, and the rotating shaft is provided with a gear matched with the rack.

8. The magnetic drill for improving drilling accuracy according to claim 1, It is characterized in that The electric drill unit includes an electric drill housing, a connecting frame connecting the electric drill housing and a slide seat, a motor installed in the electric drill housing, a drill mounting rod driven by the motor, and a drill bit installed on the drill mounting rod, wherein the drill mounting rod has a socket into which the drill bit can be inserted, and the drill mounting rod has a drill locking bolt for locking the relative position of the drill mounting rod and the drill bit.

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