Silent electric drill

Abstract

The utility model relates to a mute electric drill relates to electric drill equipment technical field. Mute electric drill mainly by control unit, execution unit, accomodate unit constitute, control unit is the control box of being placed in the carrying case, execution unit inside integrated propulsion mechanism, propulsion transmission shaft, propulsion follow -up support structure, propulsion tail fixed base, drilling rig drive structure, drill chucking device, propulsion sliding block, propulsion slide rail, drilling rig fixed base, drilling rig control box, accomodate unit includes carrying case and accessory box. The utility model can realize localization, no -load noise is less than or equal to 35 decibels, working noise is less than or equal to 75 decibels, maximum torque is greater than or equal to 45 newton meter, supports AC DC double power supply, wired and wireless double operation mode, adapts -20 DEG C to +55 DEG C environment and IP66 grade dustproof waterproof, can drill to various material wallboard, and the operation is convenient and intelligent, and the safety protection is perfect, solves the problem that the existing domestic mute electric drill core technology depends on import, product loss, adaptation deficiency.

Description

Technical Field

[0001] This utility model relates to the field of electric drilling equipment technology, specifically a silent electric drill that can silently drill holes in wall panels of various materials such as brick-concrete walls, concrete, aluminum-lithium alloy plates, iron plates, glass curtain walls, and ceramic curtain walls. Background Technology

[0002] In specialized industries performing special tasks, silent electric drills are crucial equipment for ensuring stealth and efficiency. They must operate with low noise while also meeting the drilling requirements of various wall materials. Currently, while foreign silent electric drills have significant advantages in motor technology, material application, and noise reduction technology—such as using advanced brushless DC motors, special alloys, and high-performance composite materials, and integrating active noise reduction technology, achieving noise levels as low as below 25 decibels—and offer a wide variety of products suitable for extreme environments and special tasks, their high price and the existence of barriers to core technology hinder widespread procurement and maintenance.

[0003] Although domestic silent electric drills have made some technological progress and can basically meet the needs of routine special industry tasks, the following shortcomings still exist: 1. Core technologies: Key components such as high-end motor control systems, high-precision gears, and intelligent sensors rely on imports, resulting in unstable torque, slow speed response, and short service life of electric drills.

[0004] 2. In terms of product variety: The development of special products for extreme environments such as high temperature, extreme cold, and electromagnetic shielding is lagging behind, which cannot meet the needs of complex tasks.

[0005] 3. Application level: The equipment is unevenly distributed across regions, with low equipment rates in grassroots and remote areas, and insufficient operator training makes it difficult to fully utilize the performance of electric drills.

[0006] 4. Existing domestic silent electric drills cannot fully meet the stringent requirements of special industries and special tasks in terms of noise reduction, positioning accuracy, continuous working time, and low temperature adaptability.

[0007] Therefore, it is particularly important to research a silent electric drill that is technologically independent and controllable, has comprehensive performance, is easy to operate, and can adapt to complex environments. Summary of the Invention

[0008] To overcome the shortcomings of the existing technology, the purpose of this invention is to provide a silent electric drill to solve the problems of existing silent electric drills, such as reliance on imported core technologies, poor adaptability, and inconvenience in operation.

[0009] To achieve the above-mentioned objectives, the present invention provides a silent electric drill, which mainly consists of a control unit, an execution unit, and a storage unit. The control unit is a control box placed inside a carrying case. The execution unit integrates a propulsion mechanism, a propulsion drive shaft, a propulsion follow-up support structure, a propulsion tail fixing seat, a drill drive structure, a drill bit clamping device, a propulsion slider, a propulsion slide rail, a drill fixing seat, and a drill control box. The storage unit includes a carrying case and an accessory box.

[0010] Furthermore, the outer shell and top cover of the control box of the control unit are made of POM material. The surface of the control box is equipped with a D-type waterproof CAT6 docking module, a charging port, a ring-shaped waterproof illuminated button switch and a touch screen. It has a built-in WiFi bridge and repeater, and a lithium battery. The control box is connected to the drilling rig control box via a network cable or a wireless connection module.

[0011] Furthermore, the two ends of the drilling rig control box of the execution unit are respectively fixed to the propulsion tail mounting base and the drilling rig mounting base. The outer shell and cover of the drilling rig control box are made of POM material. The surface of the drilling rig control box is equipped with a connector, a D-type waterproof CAT6 docking module, a power indicator, an LED current regulator, and a waterproof rocker switch. It has a built-in lithium battery, WiFi bridge and repeater, driver, DC step-up voltage regulator module, SC5-C0A4 type PLC programmable controller, and SC-0808-N type digital input / output module. The drilling rig control box connects to the network... The wired or wireless connection module connects to the control box. The drilling rig control box connects to the feed servo motor and the drilling rig servo motor via a power cable. The drilling rig control box receives commands from the control box and performs logic analysis and data processing. The propulsion mechanism includes a feed servo motor and a gear reducer. The feed servo motor has a rear encoder. The driving gear and driven gear of the gear reducer mesh with each other. The driving gear is connected to the output shaft of the feed servo motor via a key. The driven gear is connected to one end of the propulsion drive shaft via a key. The other end of the propulsion drive shaft is connected to the propulsion tail fixed seat via a bearing. The drive gear shaft and driven gear shaft are connected to the housing of the propulsion mechanism via bearings at both ends; the propulsion drive shaft is a ball screw, and the propulsion follow-up support structure is threadedly connected to the propulsion drive shaft; the propulsion follow-up support structure is fixed on the propulsion slide block, and the propulsion slide block slides in cooperation with the propulsion rails installed at both ends of the propulsion tail fixed seat and the drilling rig fixed seat; the drilling rig drive structure's drilling servo motor is fixed on the body of the drill bit clamping device, the drilling rig servo motor has a rear encoder, and the drilling rig servo motor is keyed to one end of the drive synchronous wheel shaft through a synchronous wheel reducer, and the drive synchronous wheel shaft is... The other end of the wheel axle and both ends of the driven synchronous wheel axle are connected to the drilling rig drive mechanism housing via bearings. The driving synchronous wheel and the driven synchronous wheel are keyed to the driving synchronous wheel axle and the driven synchronous wheel axle, respectively. The driving synchronous wheel and the driven synchronous wheel are connected by a belt. The driven synchronous wheel and the cutter bar of the drill bit clamping device are connected by a key and a shaft with an elastic retaining ring. The drilling rig drive mechanism housing is equipped with an infinitely adjustable LED light. The waterproof boat-shaped switch of the LED light is integrated into the drilling rig control box. The drill bit clamping device adopts a detachable mechanism, which includes a cutter bar and a collet. The collet clamps the drill bit.

[0012] Furthermore, the housings of the feed servo motor and gear reducer, the housing of the drilling rig servo motor and its synchronous gear reducer, the driving synchronous gear, the driven synchronous gear, and the propulsion tail fixing seat are made of aluminum alloy. The feed servo motor and drilling rig servo motor are DC brushless servo motors. The driving gear and driven gear are made of polyetheretherketone (PEEK) material and have a helical gear structure. The gearbox is filled with low-temperature lubricating grease and sound-absorbing cotton. The propulsion slide rail has a hollow design. The drilling rig fixing seat is made of 304 stainless steel. The propulsion drive shaft is made of 4Cr13 mold steel.

[0013] Furthermore, the carrying case is made of PC and ABS composite material to store and protect the control unit and the execution unit; the accessory case is made of PP material.

[0014] Furthermore, the execution unit supports AC / DC dual power supply modes. When powered by DC, it is powered by a lithium battery and the power level is displayed in real time. When powered by AC, it is connected to the mains power through an adapter. The two modes can be switched by a selector switch. The control unit and the execution unit support both wired and wireless operation modes.

[0015] Compared with the prior art, this utility model has the following advantages: 1. Independent and controllable technology: The raw materials are domestically commonly used alloys and plastics and purchased standard parts, which can be made domestically. Core components do not rely on imports, reducing procurement costs and supply risks.

[0016] 2. Excellent noise reduction: The use of a DC brushless servo motor can eliminate carbon brush friction noise. The reducer gear adopts a high-precision helical gear structure and PEEK material, and is used with low-temperature lubricating grease to reduce meshing vibration and friction noise. The inner layer of the reducer housing is filled with sound-absorbing material. The no-load noise is no more than 35 decibels, and the working noise is no more than 75 decibels, which can meet the special operation requirements.

[0017] 3. Reliable performance: Maximum torque not less than 50 N·m, maximum rated drilling speed not less than 340 rpm, positioning error not greater than 1 mm in automatic mode, can efficiently drill holes in various wall panels, and has IP66 dustproof and waterproof rating, low temperature adaptability from -20℃ to +55℃, continuous working time not less than 1 hour in battery power mode, and no-load battery life not less than 8 hours, which can adapt to complex task environments.

[0018] 4. Convenient and intelligent operation: Equipped with a simple and intuitive touch screen, the interface menu is controlled within 2 levels, supports both wired and wireless operation modes, and has automatic initialization, working mode memory, and real-time data monitoring functions. The automatic mode installation and operation time is short, and it has a built-in fault diagnosis system to reduce the difficulty of operation and maintenance costs.

[0019] 5. Comprehensive safety protection: Equipped with gloves and goggles to ensure operator safety; the control circuit has short-circuit protection and reverse connection protection, and the servo motor and control box have a high protection level to avoid safety risks caused by equipment failure or environmental factors. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a simplified structural diagram of the present invention.

[0021] Figure 2 This is a simplified structural diagram of the accessory box of this utility model.

[0022] Figure 3 yes Figure 1 A simplified schematic diagram of the propulsion mechanism.

[0023] Figure 4 yes Figure 1 A simplified schematic diagram of the drive mechanism of a drilling rig.

[0024] Figure 5 yes Figure 1 A simplified schematic diagram of the detachable mechanism of the drill bit clamping device.

[0025] Figure 6 This is a block diagram of the electrical connection structure of this utility model.

[0026] In the diagram: 1. Propulsion mechanism; 2. Propulsion drive shaft; 3. Propulsion follow-up support structure; 4. Propulsion tail fixing seat; 5. Drilling rig drive structure; 6. Drill bit clamping device; 7. Propulsion slider; 8. Propulsion slide rail; 9. Drilling rig fixing seat; 10. Control box; 11. Drilling rig control box; 12. Feed servo motor; 13. Gear reducer; 14. Drive gear; 15. Driven gear; 16. Drilling rig servo motor; 17. Drilling rig drive mechanism housing; 18. Drive synchronous pulley; 19. Driven synchronous pulley; 20. Belt; 21. LED light; 22. Tool holder; 23. Collet; 24. Carrying case; 25. Accessory box. Detailed Implementation

[0027] To make the invention's objectives, technical solutions, and advantages clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, this utility model of a silent electric drill mainly consists of a control unit, an execution unit, and a storage unit. Each component works in concert through specific structures, materials, and connection methods to achieve silent drilling, ensuring stable operation in environments ranging from -20℃ to +55℃. The silent drill's no-load noise is ≤35 dB, its operating noise is ≤75 dB, its maximum torque is ≥45 N·m, its maximum rated drilling speed is ≥350 rpm, and its automatic mode positioning error is ≤1 mm. The control unit and execution unit support both AC and DC power supply modes. In DC power supply mode, it is powered by a 48V-7Ah low-temperature lithium battery pack (operating temperature -20℃ to +55℃) with real-time power display. The lithium battery has overcharge and over-discharge protection. In AC power supply mode, it is connected to mains power via an adapter. The two modes can be switched via a selector switch. The control unit and execution unit support both wired and wireless operation modes. The wireless remote control transmission distance can reach 20 meters in open, unobstructed environments.

[0029] The control box 10 of the control unit has a shell and top cover made of POM material. The surface of the control box 10 features a D-type waterproof CAT6 connector module (Category 6), a DC-025M-5.5×2.1 pin charging port, a ring-shaped waterproof illuminated push-button switch, and a 7-inch touchscreen. It has a built-in VAP11G-500S WiFi bridge and repeater, and a 4V-1300mAh lithium battery. The control box 10 connects to the drilling rig control box 11 via a network cable or wireless connection module. The ring-shaped waterproof illuminated push-button switch of the control box 10 is connected to the touchscreen, and the ring-shaped waterproof illuminated push-button switch and the touchscreen are connected via Wi-Fi. The WiFi bridge and repeater connect to the D-type waterproof CAT6 docking module. The power output of the lithium battery connects to the WiFi bridge and repeater via a ring-shaped waterproof illuminated push-button switch, enabling wireless communication for the control box 10. This also provides power and signal interaction for the touchscreen and the ring-shaped waterproof illuminated push-button switch, facilitating human-machine operation and status display. The charging port connects to the lithium battery for charging management. The D-type waterproof CAT6 docking module connects to the D-type waterproof CAT6 docking module of the drilling rig control box 11 via a network cable, establishing a wired data transmission link for transmitting control commands and feedback information. The control box 10 features an automatic heavy-load switching mode, allowing for high-speed, high-efficiency operation when torque is low and stable low-speed operation when torque is high. It also has fault diagnosis functions, automatically stopping and alarming when abnormal current or torque is detected. Furthermore, it features automatic initialization, work data recording, and fault diagnosis alarm functions. Finally, it offers automatic drilling depth setting and manual / automatic stepless speed regulation.

[0030] The execution unit mainly consists of a propulsion mechanism 1, a propulsion drive shaft 2, a propulsion follow-up support structure 3, a propulsion tail fixed seat 4, a drilling rig drive structure 5, a drill bit clamping device 6, a propulsion slider 7, a propulsion slide rail 8, a drilling rig fixed seat 9, and a drilling rig control box 11.

[0031] The drilling rig control box 11 is responsible for receiving instructions from the control box 10 and performing logical analysis and data processing on the entire automated drilling process. The two ends of the drilling rig control box 11 are fixed to the propulsion tail mounting base 4 and the drilling rig mounting base 9, respectively. The outer shell and cover of the drilling rig control box 11 are made of POM material. The surface of the drilling rig control box 11 is equipped with a connector, a D-type waterproof CAT6 docking module (Category 6), a power indicator, an LED current regulator, and a waterproof rocker switch. It has a built-in 48V-7Ah lithium battery, a VAP11G-500S WiFi bridge and repeater, an LD3M-EC7010 driver, a GYDC2403 DC-DC step-up regulator module, an SC5-C0A4 PLC programmable controller, and an SC-0808-N digital input / output module. The charging port of the drilling rig control box 11 is connected to a lithium battery. The output of the lithium battery is connected to a DC-DC step-up regulator module via a waterproof rocker switch (the waterproof rocker switch has three positions: battery power, off, and power supply) to achieve voltage conversion. The DC-DC step-up regulator module supplies power to an SC5-C0A4 PLC programmable controller, an SC-0808-N digital input / output module, and a driver. The waterproof rocker switch is connected to an LED current regulator and a power display to display the power level and provide stepless adjustment for the LED 21. The DC-DC step-up regulator module is connected to the driver of the drilling rig servo motor 16 via a four-pin connector through the PLC programmable controller and the digital input / output module. The waterproof rocker switch is also connected to the driver of the drilling rig servo motor 16 via a seven-pin connector. The digital input / output module is connected to the driver of the feed servo motor 12 via a four-pin connector, and the waterproof boat-shaped switch is connected to the driver of the drilling rig servo motor 16 via a seven-pin connector. The digital input / output module is connected to the sensor via a six-pin connector. The sensor is installed on the propulsion follow-up support structure 3 and is used to detect the movement distance of the propulsion drive shaft 2. The PLC programmable controller is connected to the power cables of the feed servo motor 12 and the drilling rig servo motor 16 via the digital input / output module and outputs drive commands. The drilling rig control box 11 also has a built-in WiFi bridge and repeater. The WiFi bridge and repeater are connected to the PLC programmable controller. The WiFi bridge and repeater are also connected to the D-type waterproof CAT6 docking module of the control box 10 via a network cable. The WiFi bridge and repeater establish a wired communication link with the wireless module of the control box 10.The PLC programmable controller is based on the Leadsys Studio platform, uses a quad-core high-speed processor, and has a built-in light / heavy load automatic switching mode. It operates at high speed and high efficiency when the torque is low, and operates at low speed and stable when the torque is high. It has fault diagnosis function, and automatically stops and alarms when abnormal current or torque is detected. The control algorithm conforms to the PLCopen standard and has automatic initialization, working data recording, fault diagnosis and alarm functions. It supports Ether-Cat bus control, automatic drilling depth setting and manual / automatic stepless speed regulation.

[0032] The propulsion mechanism 1 includes a Leadshine LVM06002H3H3-M17 type DC brushless feed servo motor 12 and a gear reducer 13. The feed servo motor 12 is equipped with a rear encoder. The drive gear 14 and driven gear 15 of the gear reducer 13 mesh with each other. The drive gear 14 is connected to the output shaft of the feed servo motor 12 via a key. The driven gear 15 is connected to one end of the propulsion drive shaft 2 via a key. The other end of the propulsion drive shaft 2 is connected to the propulsion tail fixing seat 4 via a bearing. The two ends of the drive gear shaft and the driven gear shaft are respectively connected to the housing of the propulsion mechanism 1 via bearings. The propulsion drive shaft 2 is a ball screw. The propulsion follow-up support structure 3 is threadedly connected to the propulsion drive shaft 2. The propulsion follow-up support structure 3 is fixed on the propulsion slider 7. The propulsion slider 7 slides with the propulsion slide rails 8 installed at both ends of the propulsion tail fixing seat 4 and the drilling rig fixing seat 9. The Leadshine LVM06002H3H3-M17 type DC brushless drilling rig servo motor 16 of the drilling rig drive structure 5 is fixed on... On the body of the drill bit clamping device 6, the drill rig servo motor 16 is equipped with a rear encoder. The drill rig servo motor 16 is keyed to one end of the active synchronous pulley shaft via a synchronous pulley reducer. The other end of the active synchronous pulley shaft and both ends of the driven synchronous pulley shaft are respectively connected to the drill rig drive mechanism housing 17 via bearings. The active synchronous pulley 18 and the driven synchronous pulley 19 are keyed to the active synchronous pulley shaft and the driven synchronous pulley shaft, respectively. The active synchronous pulley 18 and the driven synchronous pulley 19 are connected by a belt 20. The cutter bar 22 of the drill bit clamping device 6 is connected to the shaft by a key and a flexible retaining ring. The drill drive mechanism housing 17 is equipped with an infinitely adjustable LED light 21, which can adjust the brightness to meet the working needs in dim environments. The waterproof boat-shaped switch of the LED light 21 is integrated on the drill control box 11. The drill bit clamping device 6 adopts a detachable mechanism, including an ER20M16 type cutter bar 22 and an ER2 type collet 23. The collet 23 clamps the drill bit. When not in use, the drill bit can be removed and placed in the accessory box 25.

[0033] After receiving control commands from the PLC programmable controller of the control unit, the drivers of the feed servo motor 12 and the drilling rig servo motor 16 convert the control signals into electrical signals recognizable by the servo motors. These signals drive the feed servo motor 12 to rotate the propulsion drive shaft 2, which then moves forward or backward along the propulsion slide rail 8 via the propulsion follow-up support structure 3 and the propulsion slider 7, thus achieving the feed action of the drill bit. Precise control is achieved through sensors in the propulsion follow-up support structure 3, which also drive the drilling rig servo motor 16 to rotate the drill bit. The drivers adjust the states of the feed servo motor 12 and the drilling rig servo motor 16 in real time. When an abnormal torque is detected, the machines automatically stop and an alarm is triggered.

[0034] The housings of the feed servo motor 12 and gear reducer 13, the housing of the drilling rig servo motor 16 and its synchronous gear reducer, the driving synchronous gear 18, the driven synchronous gear 19, and the propulsion tail fixing seat 4 are made of aluminum alloy (with black oxide surface treatment). The driving gear 14 and driven gear 15 are made of polyetheretherketone (PEEK) material. The gearbox is filled with low-temperature lubricating grease and sound-absorbing cotton. The propulsion slide rail 8 adopts a hollow design with a positioning accuracy of ±0.01~±0.5mm. The drilling rig fixing seat 9 is made of 304 stainless steel. The dimensions of the propulsion tail fixing seat 4 and the drilling rig fixing seat 9 have been optimized to reduce weight while ensuring strength. The propulsion drive shaft 2 is made of 4Cr13 mold steel.

[0035] The storage unit includes a carrying case 24 and an accessory box 25. The carrying case 24 is made of PC and ABS composite material with an IP55 protection rating. It is used to store and protect the control unit and the execution unit, and is easy to carry. The accessory box 25 is made of PP material and contains gloves, goggles, a 200W power cable, operation and maintenance tools, spare drill bits (including carbide brick drill bits, cobalt-containing high-speed steel metal drill bits, ceramic glass special drill bits, etc., with at least four diameter specifications for each type of drill bit), spare lithium batteries and chargers, etc. The spare lithium batteries can be quickly replaced to provide backup power for the equipment. There are two chargers that can charge the lithium batteries in the control box 10 and the drilling rig control box 11.

Claims

1. A silent electric drill, characterized in that: The silent electric drill consists of a control unit, an execution unit, and a storage unit. The control unit is a control box (10) placed inside the carrying case (24). The execution unit integrates a propulsion mechanism (1), a propulsion drive shaft (2), a propulsion follow-up support structure (3), a propulsion tail fixing seat (4), a drill drive structure (5), a drill bit clamping device (6), a propulsion slider (7), a propulsion slide rail (8), a drill fixing seat (9), and a drill control box (11). The storage unit includes a carrying case (24) and an accessory box (25).

2. A silent electric drill according to claim 1, characterized in that: The outer shell and top cover of the control box (10) of the control unit are made of POM material. The surface of the control box (10) is provided with a D-type waterproof CAT6 docking module, a charging port, a ring waterproof button switch with light and a touch screen. It has a built-in WiFi bridge and repeater, and a lithium battery. The control box (10) is connected to the drilling rig control box (11) through a network cable or wireless connection module.

3. A silent electric drill according to claim 1, characterized in that: The two ends of the drilling rig control box (11) of the execution unit are fixed on the propulsion tail fixing seat (4) and the drilling rig fixing seat (9) respectively. The outer shell and cover of the drilling rig control box (11) are made of POM material. The surface of the drilling rig control box (11) is equipped with a flight plug, a D-type waterproof CAT6 docking module, a power display, an LED current regulator, and a waterproof boat-type switch. It has a built-in lithium battery, WiFi bridge and repeater, driver, DC step-up voltage regulator module, SC5-C0A4 type PLC programmable controller, and SC-0808-N type digital input and output module. The drilling rig control box (11) is connected to the control box (10) through a network cable or wireless connection module. The drilling rig control box (11) is connected to the control box (10) through a power supply. The cable is connected to the feed servo motor (12) and the drilling rig servo motor (16). The drilling rig control box (11) receives the instructions from the control box (10) and performs logical analysis and data processing on them. The propulsion mechanism (1) includes the feed servo motor (12) and the gear reducer (13). The feed servo motor (12) is equipped with a rear encoder. The drive gear (14) and driven gear (15) of the gear reducer (13) mesh with each other. The drive gear (14) is connected to the output shaft of the feed servo motor (12) by a key. The driven gear (15) is connected to one end of the propulsion drive shaft (2) by a key. The other end of the propulsion drive shaft (2) is connected to the propulsion tail fixed seat (4) by a bearing. The drive gear shaft and the driven gear Both ends of the shaft are connected to the housing of the propulsion mechanism (1) via bearings; the propulsion drive shaft (2) is a ball screw, and the propulsion follow-up support structure (3) is threadedly connected to the propulsion drive shaft (2); the propulsion follow-up support structure (3) is fixed on the propulsion slider (7), and the propulsion slider (7) is slidably engaged with the propulsion slide rails (8) installed at both ends of the propulsion tail fixed seat (4) and the drilling rig fixed seat (9); the drilling rig servo motor (16) of the drilling rig drive structure (5) is fixed on the body of the drill bit clamping device (6), the drilling rig servo motor (16) is equipped with a rear encoder, and the drilling rig servo motor (16) is keyed to one end of the active synchronous wheel shaft via a synchronous wheel reducer, and the other end of the active synchronous wheel shaft and the two ends of the driven synchronous wheel shaft are connected to the active synchronous wheel shaft. The ends are connected to the drill drive mechanism housing (17) via bearings. The active synchronous pulley (18) and the driven synchronous pulley (19) are connected to the active synchronous pulley shaft and the driven synchronous pulley shaft respectively via key. The active synchronous pulley (18) and the driven synchronous pulley (19) are connected via belt (20). The driven synchronous pulley (19) is connected to the cutter bar (22) of the drill bit clamping device (6) via key and shaft elastic retaining ring. The drill drive mechanism housing (17) is equipped with an infinitely adjustable LED light (21). The waterproof boat-shaped switch of the LED light (21) is integrated on the drill control box (11). The drill bit clamping device (6) adopts a detachable mechanism, including the cutter bar (22) and the collet (23). The collet (23) clamps the drill bit.

4. A silent electric drill according to claim 3, characterized in that: The housings of the feed servo motor (12) and gear reducer (13), the housing of the drilling rig servo motor (16) and its synchronous gear reducer, the active synchronous gear (18), the driven synchronous gear (19) and the propulsion tail fixing seat (4) are made of aluminum alloy. The feed servo motor (12) and drilling rig servo motor (16) are DC brushless servo motors. The active gear (14) and driven gear (15) are made of cervical polyether ether ketone material and have a helical tooth structure. The gearbox is filled with low-temperature lubricating grease and sound-absorbing cotton. The propulsion slide rail (8) has a hollow design. The drilling rig fixing seat (9) is made of stainless steel. The propulsion drive shaft (2) is made of mold steel.

5. A silent electric drill according to claim 1, characterized in that: The carrying case (24) is made of PC and ABS composite material to store and protect the control unit and the execution unit; the accessory box (25) is made of PP material.

6. A silent electric drill according to claim 1, characterized in that: The execution unit supports AC / DC dual power supply modes. When powered by DC, it is powered by a lithium battery and the power level is displayed in real time. When powered by AC, it is connected to the mains power through an adapter. The two modes can be switched by a switch. The control unit and the execution unit support both wired and wireless operation modes.

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