Variable-speed electric wrench

Abstract

The utility model discloses a variable-speed electric wrench which comprises a handle, a connecting shell is installed at the bottom of the handle, a knob type speed regulation switch is installed on the connecting shell, a shell is integrally formed on the top of the handle, a screwing assembly and a cooling fan are installed in the shell, and the cooling fan is electrically connected with the knob type speed regulation switch. A stepless speed change switch electrically connected with the screwing assembly is installed on the side wall of the handle, one end of the shell is in threaded connection with a dustproof net assembly, and the side face of the dustproof net assembly is movably connected with a baffle mechanism. According to the electric wrench, the stepless speed change switch is arranged, a user can manually operate the stepless speed change switch to adjust the rotating speed of the screwing assembly in real time according to actual working requirements such as the specification of a bolt and the difficulty degree of screwing or unscrewing, and the electric wrench can adapt to various different working scenes through the stepless speed adjusting function; therefore, the working efficiency and the flexibility can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of electric wrench technology, and in particular to a variable speed electric wrench. Background Technology

[0002] In the mechanical assembly, maintenance and manufacturing industries, electric wrenches are widely used as efficient and convenient fastening tools for tightening and loosening bolts and nuts. With the continuous advancement of technology, the functionality and ease of use of electric wrenches have become important indicators for measuring their performance. Among them, heat dissipation performance, as a key factor in ensuring the long-term stable operation of electric wrenches, is receiving increasing attention in the industry.

[0003] Traditional electric wrenches often use cooling fans with a fixed airflow speed in their heat dissipation design. While this design can meet basic heat dissipation needs to a certain extent, its heat dissipation efficiency is inadequate when facing different work intensities and working environments. For example, when tightening high-strength bolts or working continuously for a long time, the motor and transmission components inside the electric wrench will generate a lot of heat. If the cooling fan cannot adjust its speed according to actual needs, it may cause the motor to overheat, or even lead to performance degradation or damage. On the other hand, when the load is small and the heat generation is low, the fan still runs at high speed, which not only wastes electricity but also generates unnecessary noise, affecting the user experience.

[0004] Therefore, developing an electric wrench that can adjust the cooling fan speed in real time according to the heat generation of the screw-in component has become a technical problem that urgently needs to be solved in the industry. This application proposes a variable-speed electric wrench, which allows users to make the cooling fan run at the corresponding speed according to the actual heat generation of the screw-in component. This ensures the safety of the screw-in component while reducing energy consumption and noise, and improving the efficiency and user experience of the electric wrench. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a variable-speed electric wrench.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A variable-speed electric wrench includes a handle, a connecting shell installed at the bottom of the handle, and a rotary speed control switch installed on the connecting shell. The top of the handle is integrally formed with a housing, and a turning assembly and a cooling fan are installed inside the housing. The cooling fan and the rotary speed control switch are electrically connected. A stepless speed switch electrically connected to the turning assembly is installed on the side wall of the handle. A dustproof mesh assembly is threaded to one end of the housing, and a baffle mechanism is movably connected to the side of the dustproof mesh assembly.

[0008] As a further embodiment of this utility model: the screwing assembly includes a screwing motor and a screwing head, the screwing motor is fixed inside the housing, and the screwing head is installed at the output end of the screwing motor.

[0009] As a further embodiment of this utility model: the dustproof net assembly includes a baffle plate, a mounting ring and a dustproof net body, the mounting ring is threaded to one end of the housing, and the baffle plate and the dustproof net body are fixed to the inner circumference of the mounting ring.

[0010] As a further embodiment of this utility model: the baffle mechanism includes a knob, a rib, and a rotating shaft. The rotating shaft is movably connected to the outer wall of one side of the baffle, and the rib is integrally formed on the outer wall of the rotating shaft. The knob is fixed to one end of the rotating shaft, and an elastic plate is movably connected between the rotating shaft and the outer wall of the rib.

[0011] As a further embodiment of this utility model: the elastic plate includes a baffle body and a spring, the baffle body is movably connected to the outside of the rib and the rotating shaft, and the spring is fixed between the baffle body and the knob.

[0012] As a further improvement of this utility model, a rubber pad is adhered to one side of the outer wall of the baffle body.

[0013] As a further improvement of this utility model, both the shielding plate and the dustproof net have a fan-shaped structure.

[0014] As a further improvement of this utility model, a battery is installed at the bottom of the connecting shell.

[0015] Compared with the prior art, this utility model provides a variable speed electric wrench, which has the following beneficial effects:

[0016] This application is equipped with a stepless speed switch, which allows users to manually adjust the speed of the screw-on component in real time according to actual work needs, such as the specifications of the bolts and the difficulty of tightening or loosening them. This stepless speed regulation function enables the electric wrench to adapt to various different work scenarios, greatly improving work efficiency and flexibility.

[0017] Equipped with a cooling fan and a rotary speed control switch to adjust the fan speed, users can select the appropriate fan speed setting based on the heat generated by the screw assembly. This ensures that the screw assembly receives sufficient heat dissipation during operation, thereby guaranteeing its safety and extending its service life.

[0018] The dustproof net assembly's main body serves to filter dust and, in conjunction with a cooling fan, accelerates heat dissipation. When cleaning the main body, users can easily remove the mounting ring from the housing for rinsing and cleaning. Additionally, the baffle mechanism can block the main body after cleaning, reducing dust accumulation and extending the cleaning cycle, thus lowering maintenance costs.

[0019] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the rear structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the internal structure of the main body of this utility model.

[0023] Figure 4 This is a schematic diagram of the overall structure of the dustproof component of this utility model.

[0024] Figure 5 This is a schematic diagram of the explosion structure of the dustproof component of this utility model.

[0025] In the diagram: 1. Housing; 2. Handle; 3. Connecting housing; 4. Battery; 5. Rotary speed control switch; 6. Stepless speed switch; 7. Twisting head; 8. Baffle body; 9. Twisting motor; 10. Cooling fan; 11. Baffle plate; 12. Mounting ring; 13. Dustproof net body; 14. Rubber pad; 15. Spring; 16. Knob; 17. Rib plate; 18. Rotating shaft. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Variable speed electric wrenches, such as Figures 1 to 5 As shown, the device includes a handle 2, a connecting shell 3 installed at the bottom of the handle 2, and a rotary speed control switch 5 installed on the connecting shell 3. The top of the handle 2 is integrally formed with a housing 1, and a rotating assembly and a cooling fan 10 are installed inside the housing 1. The cooling fan 10 and the rotary speed control switch 5 are electrically connected. A stepless speed switch 6, which is electrically connected to the rotating assembly, is installed on the side wall of the handle 2. A dustproof mesh assembly is threaded to one end of the housing 1, and a baffle mechanism is rotatably connected to the side of the dustproof mesh assembly.

[0028] The screw-tightening assembly can be used to tighten or loosen bolts or nuts. The continuously variable speed switch 6 can control the speed of the screw-tightening assembly. The continuously variable speed switch 6 adjusts the input power of the screw-tightening assembly by changing parameters such as resistance, voltage or current in the circuit, thereby achieving stepless adjustment of the speed of the screw-tightening assembly. In the electric wrench, it is electrically connected to the screw-tightening assembly, which is equivalent to a variable resistor or uses an electronic speed control circuit to control the speed of the core component of the motor screw-tightening assembly. When using the electric wrench, the user can manually operate the continuously variable speed switch 6 according to the actual work requirements, such as the bolt specifications and the difficulty of tightening or loosening. By pressing the switch, the user can change the internal resistance value of the switch or trigger the electronic speed control signal, thereby adjusting the speed of the screw-tightening assembly in real time.

[0029] The cooling fan 10 can be used to dissipate heat during the operation of the screwing assembly, ensuring the safe operation of the screwing assembly. The rotary speed control switch 5 is used to adjust the wind speed of the cooling fan 10. The rotary speed control switch 5 is mainly used to control the wind speed of the cooling fan 10. By changing the circuit parameters, the input power of the fan motor is adjusted. Generally, it may use variable resistor, PWM pulse width modulation and other technologies to achieve stepless or step-by-step adjustment of the wind speed.

[0030] The rotary speed control switch 5 uses a graded adjustment method, with multiple speed settings indicated on the switch, such as low speed, medium speed, and high speed. Users can select different speeds by rotating the knob, allowing the cooling fan 10 to operate at the corresponding speed. For example, when the rotation component is under light load and generates less heat, a low speed can be selected to reduce energy consumption and noise. When the rotation component operates under high load for extended periods and generates significant heat, a high speed can be selected to enhance heat dissipation.

[0031] Users can operate the stepless speed switch 6 and the rotary speed control switch 5 separately according to their actual needs. When tightening the bolts, first adjust the speed of the screw-in assembly using the stepless speed switch 6, and then adjust the speed of the cooling fan 10 using the rotary speed control switch 5 according to the heat generated by the screw-in assembly.

[0032] The dustproof mesh assembly can prevent dust from entering the housing 1, and can also work with the cooling fan 10 to accelerate the dissipation of heat. The dustproof mesh assembly and the housing 1 are connected by threads, making it easy to disassemble the dustproof mesh assembly and the housing 1 when cleaning is required. The baffle mechanism can block the dustproof mesh assembly after the work is completed, thereby reducing the adhesion of dust to the surface of the dustproof mesh and extending the cleaning cycle.

[0033] The screwing assembly includes a screwing motor 9 and a screwing head 7. The screwing motor 9 is fixed inside the housing 1, and the screwing head 7 is installed at the output end of the screwing motor 9.

[0034] The rotary motor 9 can drive the rotary head 7 to rotate, and the rotary head 7 can tighten or loosen bolts or nuts during the rotation process. The speed of the rotary motor 9 can be controlled by the stepless speed switch 6.

[0035] The dustproof net assembly includes a baffle plate 11, a mounting ring 12, and a dustproof net body 13. The mounting ring 12 is threaded to one end of the housing 1, and the baffle plate 11 and the dustproof net body 13 are fixed to the inner circumference of the mounting ring 12. Both the baffle plate 11 and the dustproof net body 13 are fan-shaped structures.

[0036] The heat generated by the rotary motor 9 during operation can be discharged through the dustproof net body 13 by the cooling fan 10. The dustproof net body 13 plays a role in dust prevention and can filter dust. When it is necessary to clean the dust attached to the dustproof net body 13, the mounting ring 12 can be removed from the housing 1, and the dustproof net body 13 can be rinsed with water to clean the dust.

[0037] The baffle mechanism includes a knob 16, a rib 17 and a rotating shaft 18. The rotating shaft 18 is rotatably connected to the outer wall of one side of the baffle 11, and the rib 17 is integrally formed on the outer circumference of the rotating shaft 18. The knob 16 is fixed to one end of the rotating shaft 18 by screws, and the rotating shaft 18 and the outer wall of the rib 17 are slidably connected by an elastic plate.

[0038] During operation, the elastic plate is rotated along the baffle plate 11 using the rotating shaft 18, so that the elastic plate and the baffle plate 11 are in contact. Heat can be discharged through the dustproof net body 13. After the operation is completed, the elastic plate is driven to rotate again using the rotating shaft 18, so that the elastic plate is in contact with the dustproof net body 13. The elastic plate blocks the dustproof net body 13, thus ensuring that it is in a non-operational state and preventing dust from contacting the dustproof net body 13, thereby extending the cleaning cycle of the dustproof net body 13.

[0039] The elastic plate includes a baffle body 8 and a spring 15. The baffle body 8 is slidably connected to the outside of the rib plate 17 and the rotating shaft 18, and the spring 15 is fixed between the baffle body 8 and the knob 16. A rubber pad 14 is adhered to one side of the outer wall of the baffle body 8.

[0040] The elastic force of the spring 15 can ensure the fit between the rubber pad 14 and the dustproof net body 13. The rubber pad 14 has a certain degree of flexibility to avoid gaps between it and the dustproof net body 13. The spring 15 drives the baffle body 8 to rotate synchronously during the rotation of the rotating shaft 18, thus avoiding relative rotation between the baffle body 8 and the rotating shaft 18.

[0041] The battery 4 is installed at the bottom of the connecting shell 3.

[0042] Battery 4 provides the necessary power to the screw-on assembly, cooling fan 10, and control system, enabling the electric wrench to work normally. The battery-powered design gives the electric wrench high portability and flexibility, and is not limited by the location of the power outlet. Users can use the electric wrench freely in various working scenarios, such as outdoor work, high-altitude work, or places without power supply, which greatly improves work efficiency and applicability. The charging port is located on the back of battery 4. When the battery 4 is low on power, users only need to insert one end of the charger into the charging port and connect the other end to the power outlet to start charging.

[0043] Working Principle: The user first checks the battery 4's power level. If the power is insufficient, charge it through the charging port on the back of battery 4 to ensure the electric wrench can work normally. Select the appropriate screwdriver head 7 according to the required bolt or nut specifications and install it at the output end of the screwdriver motor 9. The user manually controls the pressure of the stepless speed switch 6 according to actual work needs, such as bolt specifications and the difficulty of tightening or loosening. The stepless speed switch 6 adjusts the input power of the screwdriver motor 9 by changing parameters such as resistance, voltage, or current in the circuit, thereby achieving stepless adjustment of the screwdriver assembly's speed. Based on the screwdriver assembly's heat generation, the user rotates the rotary speed control switch 5 to select the fan speed level of the cooling fan 10, such as low, medium, or high. The rotary speed control switch 5 adjusts the fan motor's input power by changing circuit parameters, achieving graded fan speed adjustment. When the screwdriver head 7 is aligned with the bolt or nut, the electric wrench is activated. The screwdriver motor 9 drives the screwdriver head 7 to rotate, thus tightening or loosening the bolt or nut. During operation, the cooling fan 10 continuously operates, dissipating the heat generated by the screwdriver motor 9 through the dustproof net body 13. At the same time, the dustproof net body 13 filters dust. After the operation is completed, the user drives the elastic plate to rotate via the rotating shaft 18, so that the elastic plate is in contact with the dustproof net body 13. The rubber pad 14 in the elastic plate is tightly in contact with the dustproof net body 13 under the elastic force of the spring 15, preventing dust from contacting the dustproof net body 13 and thus extending the cleaning cycle of the dustproof net body 13. When it is necessary to clean the dust adhering to the dustproof net body 13, the user can remove the mounting ring 12 from the housing 1 and rinse the dustproof net body 13 with water to clean the dust.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Variable speed electric wrench comprising a handle (2), characterized in that, A connecting shell (3) is installed at the bottom of the handle (2), and a rotary speed control switch (5) is installed on the connecting shell (3). A housing (1) is integrally formed on the top of the handle (2), and a rotating assembly and a cooling fan (10) are installed inside the housing (1). The cooling fan (10) and the rotary speed control switch (5) are electrically connected. A stepless speed switch (6) that is electrically connected to the rotating assembly is installed on the side wall of the handle (2). A dustproof mesh assembly is threaded to one end of the housing (1), and a baffle mechanism is movably connected to the side of the dustproof mesh assembly.

2. The variable speed electric power wrench of claim 1 wherein, The screwing assembly includes a screwing motor (9) and a screwing head (7). The screwing motor (9) is fixed inside the housing (1), and the screwing head (7) is installed at the output end of the screwing motor (9).

3. The variable speed electric power wrench of claim 1 wherein, The dustproof net assembly includes a baffle plate (11), a mounting ring (12) and a dustproof net body (13). The mounting ring (12) is threaded to one end of the housing (1), and the baffle plate (11) and the dustproof net body (13) are fixed to the inner circumference of the mounting ring (12).

4. The variable speed electric power wrench of claim 3 wherein, The baffle mechanism includes a knob (16), a rib (17) and a rotating shaft (18). The rotating shaft (18) is movably connected to the outer wall of one side of the baffle (11), and the rib (17) is integrally formed on the outer wall of the circumference of the rotating shaft (18). The knob (16) is fixed to one end of the rotating shaft (18), and an elastic plate is movably connected between the rotating shaft (18) and the outer wall of the rib (17).

5. The variable speed electric power wrench of claim 4 wherein, The elastic plate includes a baffle body (8) and a spring (15). The baffle body (8) is movably connected to the outside of the rib (17) and the rotating shaft (18), and the spring (15) is fixed between the baffle body (8) and the knob (16).

6. The variable speed electric power wrench of claim 5 wherein, A rubber pad (14) is adhered to one side of the outer wall of the baffle body (8).

7. The variable speed electric power wrench of claim 3 wherein, Both the shielding plate (11) and the dustproof net body (13) are fan-shaped structures.

8. The variable speed electric power wrench of claim 1 wherein, The battery (4) is installed at the bottom of the connecting shell (3).

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