Gun drill

Abstract

The invention provides a gun drill, and relates to the technical field of electric tools. A gun drill includes: a spindle; the impact mechanism is connected with the main shaft; the first shell abuts against the impact mechanism; the main shaft, the impact mechanism and the first shell are all arranged in the second shell; one end of the conducting strip is connected with the first shell, and the other end of the conducting strip is connected with the second shell; the sensor is arranged on the second shell and used for measuring whether the second shell is electrified or not; and the controller is electrically connected with the sensor, and when the sensor detects that the second shell is electrified, the controller cuts off the power output of the gun drill and gives an alarm. The electric potential conducted to the gearbox shell from the drill bit is guided to the head shell through the conducting strip, the sensor is arranged on the head shell for voltage detection, and once it is detected that the head shell is electrified, the controller immediately cuts off power output of the motor and triggers acousto-optic or screen alarm, so that the operation safety is remarkably improved; the cable is especially suitable for complex working conditions with hidden wire risks such as buildings and decoration.

Description

Technical Field

[0001] This invention belongs to the field of power tool technology, and specifically relates to a gun drill. Background Technology

[0002] In modern machining, construction, and maintenance operations, gun drills are a common handheld power tool widely used due to their compact structure, flexible operation, and suitability for working in confined spaces.

[0003] However, in actual use, especially when drilling into walls, concrete, or metal structures, there is a risk of accidentally drilling through hidden electrical wires. Once the drill bit comes into contact with a live wire, the drill bit and its connected metal structure may become instantly energized. Since gun drills are mostly made of metal components to ensure structural strength and transmission efficiency, this energized state can easily be conducted through internal metal paths, which may not only damage the internal electronic components of the gun drill, but more seriously, may cause electric shock to the operator, threatening personal safety.

[0004] Therefore, accurately detecting whether the drill bit is charged is particularly important. However, placing a voltage sensor directly near the drill bit or spindle that is rotating at high speed and accompanied by strong vibrations presents a great challenge in engineering implementation: on the one hand, the sensor is difficult to withstand high-frequency impact and high-temperature environment; on the other hand, the rotating structure makes the electrical connection complicated, which can easily lead to signal interference or connection failure.

[0005] Therefore, there is an urgent need for a safety protection structure that can reliably and in real time detect whether the drill bit is energized due to contact with the power source without interfering with the normal operation of the drill bit, and actively cut off the power output and issue an alarm before a danger occurs. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems existing in the prior art by providing a gun drill.

[0007] The objective of this invention can be achieved through the following technical solution: a gun drill, comprising:

[0008] spindle;

[0009] An impact mechanism, which is connected to the main shaft;

[0010] A first housing, which abuts against the impact mechanism;

[0011] The second housing, in which the main shaft, the impact mechanism, and the first housing are all disposed;

[0012] A conductive sheet, one end of which is connected to the first housing and the other end of which is connected to the second housing;

[0013] A sensor, mounted on the second housing, is used to measure whether the second housing is energized.

[0014] The controller is electrically connected to the sensor. When the sensor detects that the second housing is energized, the controller cuts off the power output of the drill and issues an alarm.

[0015] As a further improvement of the present invention, the impact mechanism includes a moving impact block and a stationary impact block connected to each other, the moving impact block being connected to the main shaft, and the stationary impact block abutting against the first housing.

[0016] As a further improvement of the present invention, the dynamic impact block includes a plug-in portion and a first impact portion disposed radially outside the plug-in portion, and the static impact block includes a second impact portion and a first through hole disposed at the center of the second impact portion, the plug-in portion is inserted into the first through hole, and the first impact portion abuts against the second impact portion.

[0017] As a further improvement of the present invention, toothed surfaces are provided on two opposite sides of the first impact part and the second impact part, and the first impact part and the second impact part engage through the toothed surfaces. An annular groove is provided on the insertion part, and an elastic ring is provided on the annular groove. The elastic ring abuts against the inner side of the first through hole.

[0018] As a further improvement of the present invention, it also includes a limiting block, which is disposed on the radial outer side of the static impact block, and one end of the conductive sheet is disposed between the limiting block and the front end of the first housing, and the limiting block and the first housing abut against each other through the conductive sheet.

[0019] As a further improvement of the present invention, the static impact block is provided with a protrusion along the circumferential direction, and the limiting block is provided with a corresponding groove. The static impact block and the limiting block are in concave-convex fit. The limiting block is provided with a first fastener, which passes through the limiting block and the conductive sheet in sequence and is connected to the static impact block.

[0020] As a further improvement of the present invention, the limiting block is provided with a plurality of first mounting holes, the first fastener passes through the first mounting holes, the diameter of the first mounting holes gradually decreases towards the first housing, and the side of the first mounting holes is provided with openings.

[0021] As a further improvement of the present invention, the second housing is provided with adjacent mounting grooves and slots, the other end of the conductive sheet is disposed in the mounting groove and the end is inserted into the slot, the mounting groove is also provided with a second mounting hole, and the second fastener passes through the conductive sheet and is disposed in the second mounting hole.

[0022] As a further improvement of the present invention, a torque sleeve is also included, wherein a spring piece is provided in the circumferential direction of the limiting block, the spring piece is disposed outside the groove, the spring piece corresponds one-to-one with the groove, and the spring piece abuts against the inner wall of the torque sleeve.

[0023] As a further improvement of the present invention, a display screen is also included. The display screen is disposed at the tail of the drill bit and is electrically connected to the controller. The display screen can display the gear position of the drill bit. When the controller issues an alarm, the alarm will be displayed on the display screen. The display screen is provided with a speed adjustment button and a locking button. The speed adjustment button is used to adjust the speed of the drill bit motor, and the locking button is used to lock or unlock the speed adjustment button to prevent accidental activation.

[0024] Based on the above technical solution, the present invention can produce at least the following technical effects:

[0025] 1. This invention guides the electric potential conducted from the drill bit to the gearbox housing to the head shell through a conductive sheet, and sets a sensor on the head shell to detect the voltage. Once the head shell is detected to be energized, the controller immediately cuts off the motor power output and triggers an audible and visual or screen alarm, which significantly improves the safety of operation. It is especially suitable for complex working conditions such as construction and decoration where there is a risk of hidden wires.

[0026] 2. Compared with the solution of directly arranging the sensor near the spindle or gearbox housing where there is high speed and strong vibration, the present invention cleverly transfers the detection point to the relatively stationary and more spacious head shell position, avoiding the problem of sensor failure due to mechanical impact, high temperature or rotational interference.

[0027] 3. The conductive sheet is reliably connected between the gearbox housing and the head housing through structures such as limiting blocks and fasteners, ensuring a stable and continuous electrical conduction path. The overall solution is easy to integrate into the existing gun drill structure without major changes to the transmission or housing layout, and has good engineering feasibility and mass production compatibility.

[0028] 4. The display screen at the tail of the gun drill not only shows the current working speed in real time, but also alerts the user in the event of a leakage alarm, improving the efficiency of risk perception. It is also equipped with a speed adjustment button and a lock button, allowing the user to flexibly adjust the speed according to the working conditions. The lock button can also prevent sudden changes in speed due to accidental contact during construction, further improving the accuracy and safety of operation. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the gun drill of the present invention.

[0031] Figure 2 This is a cross-sectional view of the drill head of the present invention.

[0032] Figure 3 This is an exploded view of the conductive path in the gun drill of this invention.

[0033] Figure 4 This is a schematic diagram of the drill head after removing the drill chuck and torque sleeve of the present invention.

[0034] Figure 5 This is a side view of the limiting block, conductive sheet, and first housing in the gun drill of the present invention.

[0035] Figure 6 This is a schematic diagram of the limiting block, conductive sheet, first housing, and second housing in the gun drill of the present invention.

[0036] Figure 7 This is a schematic diagram of the moving impact block in the gun drill of the present invention.

[0037] Figure 8 This is a schematic diagram of the static impact block in the gun drill of the present invention.

[0038] Figure 9 This is a schematic diagram of the limiting block in the gun drill of the present invention.

[0039] Figure 10 A schematic diagram of the second housing in the gun drill of the present invention.

[0040] Figure 11 Rear view of the gun drill of the present invention.

[0041] In the diagram, 100 is the spindle; 200 is the impact mechanism; 210 is the moving impact block; 211 is the insertion part; 212 is the first impact part; 213 is the annular groove; 214 is the elastic ring; 220 is the static impact block; 221 is the first through hole; 222 is the second impact part; 223 is the protrusion; 300 is the first housing; 400 is the second housing; 410 is the mounting groove; 411 is the second mounting hole; 412 is the second fastener; 420 is the slot; 500 is the conductive sheet; 600 is the limiting block; 610 is the groove; 620 is the first mounting hole; 621 is the first fastener; 622 is the opening; 630 is the spring; 640 is the front cover plate; 700 is the torque sleeve; 800 is the display screen; 810 is the speed adjustment button; 820 is the locking button; 830 is the push button; and 900 is the drill chuck. Detailed Implementation

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "first," "second," or "a" in the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. In the present invention, unless otherwise explicitly specified and defined, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to the specific circumstances. Furthermore, the technical solutions of the various embodiments of this invention can be combined with each other, but only on the basis that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] The following are specific embodiments of the present invention, in conjunction with the appendix. Figure 1-11 The technical solution of the present invention will be further described below, but the present invention is not limited to the following embodiments.

[0044] The gun drill of this invention has a pistol-like structure and mainly includes a spindle 100, an impact mechanism 200, a first housing 300, a second housing 400, a conductive plate 500, a sensor, a controller, a drill chuck 900, a drill bit, and a display screen 800 at the tail end. In this embodiment, the first housing 300 is a gearbox housing, and the second housing 400 is the head shell of the gun drill. The spindle 100 serves as the core transmission component for power output, with its front end fixedly connected to the drill chuck 900, whereby the drill bit is firmly clamped, thus achieving rotary drilling. The rear end of the spindle 100 is connected to the impact mechanism 200, which provides axial impact force during drilling, making it particularly suitable for efficient drilling of hard materials such as concrete and masonry.

[0045] The impact mechanism 200 includes a moving impact block 210 and a stationary impact block 220 that cooperate with each other. The moving impact block 210 is directly connected to the main shaft 100 and rotates synchronously with the main shaft 100; the stationary impact block 220 is fixed inside the first housing 300 and does not rotate with the main shaft 100. Specifically, the moving impact block 210 includes a plug-in portion 211 and a first impact portion 212 disposed radially outside the plug-in portion 211; the stationary impact block 220 has a first through hole 221 at its center and a second impact portion 222 arranged around the through hole. During assembly, the plug-in portion 211 of the moving impact block 210 is inserted into the first through hole 221 of the stationary impact block 220, so that the first impact portion 212 and the second impact portion 222 are axially opposite to each other and can periodically impact each other. To enhance the impact transmission efficiency and prevent slippage, meshing toothed surfaces are machined on the two opposing sides of the first impact portion 212 and the second impact portion 222. When the spindle 100 drives the moving impact block 210 to rotate, the meshing and disengagement between the tooth surfaces generate periodic axial displacement, thereby forming a continuous impact action. In addition, to ensure the axial positioning and sealing of the moving impact block 210 in the first through hole 221, an annular groove 213 is provided on the insertion part 211, and an elastic ring 214 (such as an O-ring) is installed in the annular groove 213. The elastic ring 214 abuts tightly against the inner side of the first through hole 221, which not only plays a role in buffering and vibration reduction, but also prevents dust or debris from entering the interior of the impact pair.

[0046] The first housing 300 is a gearbox housing made of metal, which houses the spindle 100 and gear transmission components. Because the gun drill uses a metal structure to ensure strength and heat dissipation, if the drill bit accidentally comes into contact with a live wire, the current will be conducted sequentially along the conductive path of the drill bit, drill chuck 900, spindle 100, moving impact block 210, stationary impact block 220, and first housing 300, causing the first housing 300 to become energized. However, the first housing 300 is located at the front of the gun drill, in a confined space and adjacent to high-speed rotating transmission components, resulting in severe vibrations, making it unsuitable for directly mounting electronic sensors. Therefore, this invention innovatively introduces a conductive sheet 500, one end of which is reliably connected to the first housing 300, and the other end extends and connects to the second housing 400 (i.e., the head shell). This conductive sheet 500 is typically made of a thin copper alloy sheet with good conductivity, which can effectively conduct electric potential and has a certain deformation capacity to adapt to assembly tolerances and minor vibrations during operation.

[0047] To ensure a stable electrical connection between the conductive sheet 500 and the first housing 300, a limiting block 600 is provided on the radially outer side of the static impact block 220 in this embodiment. One end of the conductive sheet 500 is positioned between the limiting block 600 and the front end of the first housing 300. The limiting block 600 and the first housing 300 abut against each other through the conductive sheet 500, i.e., the limiting block 600 and the front end of the first housing 300 clamp the conductive sheet 500. The limiting block 600 achieves a concave-convex fit with the circumferentially distributed grooves 610 of its circumferentially distributed protrusions 223 of the static impact block 220, thereby restricting its circumferential rotation. A first fastener 621 (such as a screw) passes through the limiting block 600 and the conductive sheet 500 in sequence and is screwed into the first housing 300, thereby axially locking the limiting block 600 and the first housing 300 and locking the conductive sheet 500.

[0048] It is worth noting that the limiting block 600 is provided with multiple first mounting holes 620. The diameter of these mounting holes gradually decreases along the direction towards the first housing 300, and their sides are not completely closed, with openings 622 provided. This design not only facilitates the quick alignment and installation of the first fastener 621, but also allows the fastener to be preloaded through the elastic deformation of the hole wall during tightening, further improving the connection reliability. The limiting block 600 is also provided with a front cover plate 640, and the first mounting holes 620 are installed in the first mounting holes 620 through the front cover plate 640. At the same time, the limiting block 600 is also provided with several spring pieces 630 in the circumferential direction. Each spring piece 630 corresponds to a groove 610 and is located on its outer side. The spring piece 630 extends outward and abuts against the inner wall of the torque sleeve 700 sleeved on the outside of the limiting block 600. When the impact mechanism 200 is working, the reaction torque generated is transmitted to the torque sleeve 700 through the spring 630, and then distributed to the entire head shell structure by the torque sleeve 700, which effectively relieves local stress concentration and extends the service life of the components.

[0049] The other end of the conductive sheet 500 is connected to the second housing 400. The second housing 400 (i.e., the head shell) is also made of metal and constitutes the main body of the front outer shell of the gun drill. On its side near the limiting block 600, there are adjacently arranged mounting grooves 410 and slots 420. The end of the conductive sheet 500 is first inserted into the mounting groove 410, and then its end is further inserted into the slot 420, forming a double positioning structure to prevent the conductive sheet 500 from loosening under long-term vibration. To further strengthen the connection, the mounting groove 410 is also provided with a second mounting hole 411. A second fastener 412 (such as a screw) passes through the conductive sheet 500 and is screwed into the second mounting hole 411 to achieve mechanical locking. In this way, the conductive sheet 500 obtains a stable electrical and mechanical connection at both ends, ensuring that the potential on the first housing 300 can be reliably conducted to the second housing 400.

[0050] A sensor is installed on the second housing 400 to detect whether it is energized in real time. This sensor can be a voltage sensing probe, an electric field sensor, or a leakage current detection module. Its installation position is flexible; it can be embedded in the internal cavity of the second housing 400 or placed externally on the surface of the head shell to form an independent detection unit. The sensor is electrically connected to a controller, which is typically integrated into the control circuit board inside the drill bit and linked to the motor drive circuit. When the sensor detects an abnormal voltage in the second housing 400, it determines that the drill bit may be energized due to contact with an electrical wire. At this time, the controller immediately executes a safety protection procedure: on the one hand, it cuts off the power supply to the motor, stopping the spindle 100 from rotating; on the other hand, it triggers an audible and visual alarm device (such as a buzzer or flashing LED) and displays a "leakage current alarm" or similar message on the display screen 800 at the tail, reminding the operator to immediately stop work and investigate the source of the risk.

[0051] It is worth mentioning that this invention features an integrated display screen 800 at the tail of the drill bit, and a push button 830 on the drill body for switching working gears. When the push button 830 is slid to switch working gears, the display screen 830 will show the current working gear in real time. This display screen 800 is electrically connected to the controller and is used not only to display the current working gear (such as low speed and high speed; it should be noted that "working gear" refers to different gearbox transmission ratios), but also to provide visual feedback in the event of a safety incident.

[0052] The display screen 800 integrates a speed adjustment button and a lock button 820. Users can adjust the motor speed by pressing the speed adjustment button to suit drilling needs on different materials; the lock button 820 is used to lock the speed adjustment function—when the lock button 820 is in the "locked" state, even if the speed adjustment button is accidentally pressed, the motor speed will not change, effectively preventing accidental speed adjustments due to hand slippage or collisions during construction, improving operational stability and safety. This interactive design balances functionality and accidental touch prevention, reflecting ergonomic principles.

[0053] In summary, this invention cleverly solves the technical challenge of directly detecting the electrified state of drill bits in high-speed rotating tools by adding an electrical safety monitoring system consisting of a conductive plate 500, sensors, and a controller to the traditional gun drill structure. This system requires no modification to the original power transmission layout; simply by rationally arranging conductive paths and detection points, it can achieve early identification and proactive intervention of potential electric shock risks. The entire solution is compact, responsive, and highly reliable, meeting the performance and durability requirements of industrial-grade power tools while significantly improving user safety in complex working environments. In practical applications, this gun drill can be widely used in building decoration, electrical maintenance, pipeline installation, and other fields, and is particularly suitable for high-risk scenarios such as the renovation of old walls and areas with dense concealed wiring.

[0054] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A gun drill, characterized by The utility model relates to a gun drill, which comprises: a main shaft (100); an impact mechanism (200) connected with the main shaft (100); a first housing (300) abutting against the impact mechanism (200); a second housing (400) in which the main shaft (100), the impact mechanism (200) and the first housing (300) are arranged; an electrically conductive sheet (500) having one end connected with the first housing (300) and the other end connected with the second housing (400); a sensor arranged on the second housing (400) for measuring whether the second housing (400) is electrified; a controller electrically connected with the sensor, which cuts off the power output of the gun drill and sends an alarm when the sensor detects that the second housing (400) is electrified.

2. The gun drill according to claim 1, characterized in that, The impact mechanism (200) comprises a dynamic impact block (210) and a static impact block (220) connected with each other, the dynamic impact block (210) is connected with the main shaft (100), and the static impact block (220) abuts against the first housing (300).

3. The gun drill according to claim 2, characterized in that, The dynamic impact block (210) comprises a plug-in part (211) and a first impact part (212) arranged radially outside the plug-in part (211), the static impact block (220) comprises a second impact part (222) and a first through hole (221) arranged at the center of the second impact part (222), the plug-in part (211) is inserted into the first through hole (221), and the first impact part (212) abuts against the second impact part (222).

4. The gun drill according to claim 3, characterized in that, The first impact part (212) and the second impact part (222) are provided with toothed surfaces on opposite sides, the first impact part (212) and the second impact part (222) are engaged through the toothed surfaces, an annular groove (213) is arranged on the plug-in part (211), an elastic ring (214) is arranged on the annular groove (213), and the elastic ring (214) abuts against the inner side surface of the first through hole (221).

5. The gun drill according to claim 2, characterized in that, The utility model also comprises a limiting block (600), the limiting block (600) is arranged radially outside the static impact block (220), one end of the electrically conductive sheet (500) is arranged between the limiting block (600) and the front end of the first housing (300), and the limiting block (600) abuts against the first housing (300) through the electrically conductive sheet (500).

6. The gun drill according to claim 5, characterized in that, The static impact block (220) is provided with a protrusion (223) in the circumferential direction, a groove (610) is correspondingly arranged on the limiting block (600), the static impact block (220) and the limiting block (600) are matched in concave-convex mode, a first fastener (621) is arranged on the limiting block (600), and the first fastener (621) is connected with the first housing (300) in sequence through the limiting block (600) and the electrically conductive sheet (500).

7. The gun drill according to claim 6, characterized in that The limiting block (600) is provided with a plurality of first mounting holes (620), the first fastener (621) is arranged in the first mounting hole (620), the hole diameter of the first mounting hole (620) gradually decreases towards the first shell (300), and the side of the first mounting hole (620) is provided with an opening (622).

8. The gun drill according to claim 5, characterized in that, The second shell (400) is provided with an adjacent mounting groove (410) and a slot (420), one end of the conductive sheet (500) is arranged in the mounting groove (410), and the other end is arranged in the slot (420), and the mounting groove (410) is further provided with a second mounting hole (411), and the second fastener (412) is arranged in the second mounting hole (411) through the conductive sheet (500).

9. The gun drill according to claim 6, characterized in that Further comprising a torque sleeve (700), the limiting block (600) is provided with a spring sheet (630) in the circumferential direction, the spring sheet (630) is arranged outside the groove (610), the spring sheet (630) corresponds to the groove (610) one by one, and the spring sheet (630) abuts against the inner wall of the torque sleeve (700).

10. The gun drill according to claim 1, characterized in that, Further comprising a display screen (800), the display screen (800) is arranged at the tail of the gun drill, the display screen (800) is electrically connected with the controller, the display screen (800) can display the gear position of the gun drill, when the controller issues an alarm, the alarm is displayed on the display screen (800), the display screen (800) is provided with a speed regulating button (810) and a locking button (820), the speed regulating button is used for adjusting the rotating speed of the motor of the gun drill, and the locking button (820) is used for locking or unlocking the speed regulating button to prevent accidental touch.

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