Lithium battery brushless work tool with anti-twist function

Abstract

The utility model discloses lithium electric brushless operation tool with prevent twisting function, including host computer structure, the lower extreme of host computer structure has the detachable setting shell, the transmission assembly is installed in the shell, and the shell has the output shaft that extends downwards in, and the outer end cover that will output shaft limit is detachably fixed to the lower extreme of shell, and the detachable setting operation end is installed to the lower extreme of output shaft, transmission assembly includes axle three, and axle three is connected with output shaft sleeve, and the strong spring is supported between both. Compared with prior art, the utility model has the advantages that adopts pure mechanical type clutch structure, and bevel tooth one and bevel tooth two separate or cooperate, avoid the risk that electronic sensor is out of order because of high and low temperature, damp, dust and other bad environment, when the operation end jam produces huge reaction force, and the operator instinctively releases hand or stops pressing, and power transmission is physical instantaneous cut-off.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a lithium-ion brushless working tool with anti-torsion function. Background Technology

[0002] Currently available lithium battery-powered work tools can be combined with different components to achieve different functions. For example, the main unit can be combined with a drilling mechanism to drill the ground, or with a mixing mechanism to mix materials.

[0003] When the main unit is in use, it needs to drive the equipment to rotate. Since the main unit is operated by a person, if the main unit suddenly encounters a large obstacle, the handle will cause the operator's arm to rotate rapidly under the action of the reaction force. This can easily lead to serious personal injury accidents such as wrist sprains, arm muscle strains, or even fractures. At the same time, the sudden loss of control of the equipment may also cause the equipment itself to be damaged due to impact.

[0004] Currently, most equipment, especially entry-level products, lacks a simple and effective mechanical anti-torsion structure. This means they cannot completely cut off power transmission in the event of a sudden torque change, thus failing to completely prevent personal injury accidents and exhibiting inherent safety flaws. While some equipment currently uses gyroscopes within the controller to cut off power transmission, the reliability and stability of the gyroscope sensor and its related circuitry may decrease under harsh conditions such as high and low temperature variations and humid, dusty environments. This can easily lead to false signals or malfunctions, causing system mis-triggering, affecting operational efficiency, creating safety hazards, and requiring additional sensors and more complex control units, significantly increasing product manufacturing costs. Utility Model Content

[0005] In view of the problems mentioned above, the technical problem to be solved by this utility model is to provide a lithium-ion brushless working tool with anti-torsion function.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a lithium battery brushless working tool with anti-torsion function, including a main body structure, a detachable outer shell at the lower end of the main body structure, a transmission component installed inside the outer shell, an output shaft extending downward inside the outer shell, an outer end cover that limits the position of the output shaft is detachably fixed at the lower end of the outer shell, and a detachable working end is installed at the lower end of the output shaft. The transmission assembly includes a third shaft, which is sleeved with the output shaft. A strong spring supports the two. When the main structure is manually pressed down, the inner end of the third shaft engages with the upper end of the output shaft, allowing power to be transmitted from the third shaft to the output shaft. When the main structure is not pressed down, the inner end of the third shaft separates from the upper end of the output shaft, and power transmission is canceled.

[0007] A further preferred embodiment of this utility model is: the main unit structure has a controller and a motor inside, and its upper end has a battery pack for use as a power source. The output end of the motor inside the main unit structure has an inner shaft extending downward, and the inner shaft is used to drive the transmission component to rotate.

[0008] A further preferred embodiment of this utility model is: the transmission assembly further includes shaft one and shaft two; The lower end of the main structure and the inner wall of the outer shell are integrally formed with several mating cavities. Bearings are installed near the upper and lower ends of shaft one, shaft two and shaft three. The bearings on shaft one, shaft two and shaft three are respectively embedded into the mating cavities of the corresponding main structure and outer shell. A primary gear 1 and a driven gear 1 are fixed on shaft 1, and a primary gear 2 and a driven gear 2 are fixed on shaft 2. A primary gear 3 is fixed on shaft 3. The primary gear 1 meshes with the outer side of the inner shaft, the driven gear 1 meshes with the primary gear 2, and the driven gear 2 meshes with the primary gear 3, which is used for the transmission of kinetic energy.

[0009] A further preferred embodiment of this utility model is: the diameter of the first main gear is larger than the diameter of the first driven gear, and the diameter of the second main gear is larger than the diameter of the second driven gear.

[0010] A further preferred embodiment of this utility model is: the lower end of the shaft is a tube body, and an anti-twist block is installed inside it. The downward-facing side of the anti-twist block has an outward-protruding oblique tooth. The upper end of the output shaft extends into the shaft tube, and its upper end face has an integral helical tooth two that mates with helical tooth one. A strong spring is installed inside the output shaft, and the upper end of the strong spring extends upward out of the output shaft.

[0011] A further preferred embodiment of this utility model is: the upper end face of the anti-torsion block is a polygonal end, and its upper end face fits into the inside of the shaft three tube. A bolt fixed to the shaft three passes through the axis of the anti-torsion block, so that the anti-torsion block is detachable. The upper end of the strong spring is pressed against the bolt.

[0012] A further preferred embodiment of this utility model is: the lower end of the anti-twist block is recessed on the side that mates with the upper end of the output shaft, while the upper end of the output shaft is protruding on the side that mates with the anti-twist block, so that the anti-twist block and the output shaft fit together.

[0013] A further preferred embodiment of this utility model is as follows: a clamping cavity is formed inside the outer shell, the axis of the clamping cavity coincides with the axis of the output shaft, and a limiting plate layer is integrally formed on the outside of the output shaft in an annular arrangement. The limiting plate layer is disposed in the clamping cavity and the outer arc wall of the limiting plate layer fits against the inner wall of the clamping cavity. When the main unit structure is not pressed, the limiting plate layer contacts the inner wall of the outer end cover.

[0014] A further preferred embodiment of this utility model is: the lower end of the output shaft is a sleeve-shaped structure with threads on the inner wall, the working end is a stirring rod, the working end is threadedly connected to the lower end of the output shaft, the lower end of the stirring rod is a circular structure for contact, and the upper surface of the circular structure has a spiral blade for stirring.

[0015] A further preferred embodiment of this utility model is: the lower end of the output shaft is a rod-shaped structure extending downwards, the working end is a ground drill that is sleeved with the rod-shaped structure at the lower end of the output shaft, and a transverse pin for limiting is transversely penetrating the part where the working end is sleeved with the output shaft.

[0016] Compared with the prior art, the advantages of this utility model are: 1. It adopts a purely mechanical clutch structure, with helical gear one and helical gear two separating or engaging, avoiding the risk of electronic sensor failure due to harsh environments such as high and low temperatures, humidity, and dust. When the working end is blocked and generates a huge reaction force, the operator will instinctively release or stop pressing, and the power transmission will be physically cut off instantly.

[0017] 2. When pressing down on the main unit structure, the working end remains active; when releasing, the working end remains stationary. The operator can control the power engagement by adjusting the pressure applied, providing a good user experience.

[0018] 3. The high-strength spring, anti-torsion block, and output shaft are all detachable and replaceable. After wear, there is no need to replace the entire assembly. Only a few inexpensive parts need to be replaced for repair, which significantly reduces the user's long-term use and maintenance costs. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the outer shell and internal structure of the present invention; Figure 3 This is an exploded view of the outer shell and transmission assembly of this utility model; Figure 4 This is an exploded view of the outer shell and transmission assembly of this utility model. Figure 5 This is a schematic diagram of the structure of the present invention when the shaft three is engaged with the output shaft; Figure 6This is a schematic diagram of the structure of the present invention when the third shaft is separated from the output shaft; Figure 7 This utility model Figure 6 A magnified schematic diagram of the structure of part A in the diagram; Figure 8 This is a schematic diagram of the output shaft structure of this utility model; Figure 9 This is a schematic diagram of the structure of this utility model when the working end is a stirring rod; Figure 10 This is a schematic diagram of the structure of the working end of this utility model when it is a ground drill.

[0021] In the diagram: 1. Main unit structure; 11. Inner shaft; 12. Mating cavity; 2. Battery pack; 3. Outer shell; 31. Clamping cavity; 4. Transmission assembly; 41. Shaft 1; 42. Shaft 2; 43. Shaft 3; 431. Anti-torsion block; 432. Polygonal end; 433. Bolt; 434. Helical gear 1; 44. Bearing; 45. Main gear 1; 46. Driven gear 1; 47. Main gear 2; 48. Driven gear 2; 49. Main gear 3; 5. Output shaft; 51. Limiting plate layer; 52. Helical gear 2; 53. Strong spring; 6. Outer end cover; 7. Working end. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0023] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0024] This embodiment mainly describes a lithium-ion brushless work tool with anti-torsion function. Please refer to [link / reference]. Figures 1-10 Specifically, the following is a summary: Currently, most equipment, especially entry-level products, lacks a simple and effective mechanical anti-torsion structure. Although some equipment currently cuts off power transmission by adding a gyroscope inside the controller, the reliability and stability of the gyroscope sensor and its related circuits may decrease under harsh working conditions such as high and low temperature changes and humid and dusty conditions. Based on this, a lithium battery brushless working tool with anti-torsion function is proposed, including a main body structure 1. The lower end of the main body structure 1 has a detachable housing 3. The transmission component 4 is installed inside the housing 3. The housing 3 has an output shaft 5 extending downward. The lower end of the housing 3 is detachably fixed with an outer end cover 6 that limits the output shaft 5. The lower end of the output shaft 5 is equipped with a detachable working end 7. The transmission assembly 4 includes a shaft 43, which is sleeved with the output shaft 5. A strong spring 53 supports the two. When the main structure 1 is pressed down manually, the inner end of the shaft 43 is engaged with the upper end of the output shaft 5, so that the power of the shaft 43 is transmitted to the output shaft 5. When the main structure 1 is not pressed, the inner end of the shaft 43 is separated from the upper end of the output shaft 5, and the power transmission is canceled.

[0025] Specifically, the main unit structure 1 drives the transmission component 4 to rotate, and the transmission component 4 drives the working end 7 to rotate. The transmission component 4 has a shaft 43, which can cooperate with the output shaft 5 under the action of external operator pressing the main unit structure 1, so that the output shaft 5 rotates. When the external operator does not press, the output shaft 5 does not rotate.

[0026] It should be noted that the strong spring 53 is replaceable, and different strong springs 53 can be set according to different situations.

[0027] The main unit structure 1 has a controller and a motor inside, and a battery pack 2 at its upper end for use as a power source. The motor output end inside the main unit structure 1 has an inner shaft 11 extending downward, which is used to drive the transmission component 4 to rotate.

[0028] Specifically, the controller and motor inside the main unit structure 1 are existing technologies, as are the gyroscope inside the main unit structure 1. The power supply via the battery pack 2 is also an existing mature technology. When the inner shaft 11 rotates, the transmission component 4 is also driven to rotate.

[0029] like Figure 3 and Figure 4 As shown, the transmission assembly 4 also includes shaft 41 and shaft 42; The lower end of the main structure 1 and the inner wall of the outer shell 3 are integrally formed with several mating cavities 12. Bearings 44 are installed near the upper and lower ends of shaft 1 41, shaft 2 42 and shaft 3 43 respectively. The bearings 44 on shaft 1 41, shaft 2 42 and shaft 3 43 are respectively embedded into the mating cavities 12 of the corresponding main structure 1 and outer shell 3. A primary gear 45 and a driven gear 46 are fixed on shaft 1 41, both coaxially arranged. A primary gear 47 and a driven gear 48 are fixed on shaft 2 42, both coaxially arranged. A primary gear 49 is fixed on shaft 3 43, both coaxially arranged. The primary gear 45 meshes with the outer side of the inner shaft 11. The driven gear 46 meshes with the primary gear 47. The driven gear 48 meshes with the primary gear 49. This is used for the transmission of kinetic energy.

[0030] Specifically, by setting bearings 44 on shaft 1 41, shaft 2 42 and shaft 3 43, and limiting them through the mating cavity 12 of the main structure 1 and the outer shell 3, the resistance of shaft 1 41, shaft 2 42 and shaft 3 can be reduced as much as possible when rotating, and they can be kept in a stable state as much as possible, so as to transfer the kinetic energy of the inner shaft 11 to the main gear 3 49.

[0031] like Figure 3 and Figure 4 As shown, the diameter of main gear 1 (45) is larger than the diameter of driven gear 1 (46), and the diameter of main gear 2 (47) is larger than the diameter of driven gear 2 (48).

[0032] Specifically, the brushless motor of the lithium battery tool has a very high speed. The speed of the main gear 3 49 is significantly reduced by the transmission component 4, and the torque is amplified. The high speed and low torque power of the brushless motor is converted into the low speed and high torque power required by the working end 7.

[0033] like Figures 5-8 As shown, the lower end of shaft 3 43 is a tube body, and an anti-twist block 431 is installed inside it. The downward-facing side of the anti-twist block 431 has an outward-protruding helical tooth 434. The upper end of the output shaft 5 extends into the tube of shaft 3 43. Its upper end face has an integral helical tooth 2 52 that mates with helical tooth 1 434. A strong spring 53 is installed inside the output shaft 5, and the upper end of the strong spring 53 extends upward out of the output shaft 5.

[0034] Specifically, when the operator presses down on the main unit structure 1, the strong spring 53 will be compressed, causing the anti-torsion block 431 to engage with the output shaft 5. Conversely, when there is no downward pressing force, the helical tooth 434 of the anti-torsion block 431 will disengage from the helical tooth 52 of the output shaft 5, and the strong spring 53 will return to its original state, preventing the output shaft 5 from rotating.

[0035] like Figure 7 As shown, the upper end face of the anti-torsion block 431 is a polygonal end 432, and its upper end face fits into the inside of the shaft 43 tube. A bolt 433 that is fixed to the shaft 43 passes through the axis of the anti-torsion block 431, making the anti-torsion block 431 detachable. The upper end of the strong spring 53 is pressed against the bolt 433.

[0036] Specifically, the upper end face of the anti-twist block 431 is a polygonal end 432. The anti-twist block 431 fits inside the tube of the shaft 43. The shaft 43 can drive the anti-twist block 431 to rotate. The anti-twist block 431 is fixed inside the tube of the shaft 43 by bolts 433, so that the anti-twist block 431 can be disassembled.

[0037] like Figures 5-8As shown, the lower end of the anti-twist block 431 is recessed on the side that mates with the upper end of the output shaft 5, while the upper end of the output shaft 5 is protruding on the side that mates with the anti-twist block 431. When the anti-twist block 431 and the output shaft 5 mate, they fit together.

[0038] Specifically, the mating surfaces of the anti-torsion block 431 and the output shaft 5 can fit together, so that the helical gear 434 and the helical gear 52 can be engaged to transmit power from the anti-torsion block 431 to the output shaft 5.

[0039] like Figure 7 As shown, a clamping cavity 31 is formed inside the outer shell 3. The axis of the clamping cavity 31 coincides with the axis of the output shaft 5. The output shaft 5 has an integrally formed ring-shaped limiting plate layer 51. The limiting plate layer 51 is set inside the clamping cavity 31 and the outer arc wall of the limiting plate layer 51 is in contact with the inner wall of the clamping cavity 31. When the main unit structure 1 is not pressed, the limiting plate layer 51 is in contact with the inner wall of the outer end cover 6.

[0040] Specifically, the limiting plate 51 can slide along the clamping cavity 31. When the main structure 1 is not pressed, the helical tooth 434 and the helical tooth 52 are separated under the action of the strong spring 53. It should be noted that the strong spring 53 is in a compressed state whether the helical tooth 434 and the helical tooth 52 are engaged or not engaged. The limiting plate 51 is limited in the clamping cavity 31. When the outer end cover 6 is removed, the limiting plate 51 and the output shaft 5 can be removed.

[0041] like Figure 9 As shown, the lower end of the output shaft 5 is a sleeve-shaped structure with threads on the inner wall, and the working end 7 is a stirring rod. The working end 7 is threadedly connected to the lower end of the output shaft 5. The lower end of the stirring rod is a circular structure for contact, and the upper surface of the circular structure has spiral blades for stirring.

[0042] Specifically, when stirring at the working end 7, the lower circular structure of the working end 7 is pressed against the lower inner wall of the stirring structure, causing the first helical tooth 434 and the second helical tooth 52 to engage, causing the working end 7 to rotate. When the main structure 1 is not pressed, the first helical tooth 434 and the second helical tooth 52 can separate, causing the stirring rod to stop rotating.

[0043] like Figure 10 As shown, the lower end of the output shaft 5 is a rod-shaped structure extending downwards, and the working end 7 is a ground drill that is sleeved with the rod-shaped structure at the lower end of the output shaft 5. A transverse pin for limiting is passed through the sleeve part of the working end 7 and the output shaft 5.

[0044] Specifically, when the working end 7 is a ground drill, it needs to be squeezed downwards, which also allows the helical tooth 434 to cooperate with the helical tooth 52, causing the working end 7 to rotate. When the main structure 1 is not pressed, the helical tooth 434 and the helical tooth 52 separate, and the ground drill stops rotating.

[0045] It should be noted that when the working end 7 is a stirring rod and a ground drill, the stirring rod and the ground drill can be set up in two groups. The housing 3, the transmission component 4, the output shaft 5 and the stirring rod are in one group, and the housing 3, the transmission component 4, the output shaft 5 and the ground drill are in another group. The stirring rod or the ground drill can be separated by separating the housing 3 from the main structure 1. It should also be noted that the transmission component 4 in the stirring rod group and the ground drill group is set to different torques and speeds. The torque and speed are changed by changing the diameter of the main gear 1 45, the driven gear 1 46, the main gear 2 47, the driven gear 2 48 and the main gear 3 49. This is the existing technology, and the gear size can be adjusted according to the actual situation.

[0046] Working principle: When the main structure 1 is working, it can drive the inner shaft 11 to rotate and drive the transmission component 4 to transmit kinetic energy. The rotation of the shaft 3 43 controls the rotation of the output shaft 5, thereby causing the working end 7 to rotate.

[0047] In particular, when the rotation of shaft 43 requires the output shaft 5 to rotate, such as Figures 6-7 The diagram shows the situation where the force spring 53 is hidden and the shaft 3 43 is not engaged with the output shaft 5. When the shaft 3 43 is driven to rotate, the output shaft 5 does not rotate, and the working end 7 at the lower end of the output shaft 5 does not rotate accordingly. When the main unit structure 1 is manually pressed downwards, the shaft 3 43 engages with the output shaft 5, and the force spring 53 is compressed, as shown... Figure 5 As shown, the output shaft 5 can only drive the working end 7 to rotate under manual downward pressure. Therefore, when the working end 7 is locked, the handle, under the action of reaction force, drives the operator's arm to rotate rapidly. Under the operator's instinct, the main structure 1 is not squeezed or released, so the main structure 1 does not have a downward squeezing effect. Under the action of the strong spring 53, the anti-torsion block 431 is separated from the output shaft 5. Even if the main structure 1 is still working, the working end 7 is prevented from rotating, avoiding secondary injury to the operator.

[0048] The anti-torsion block 431 can be disassembled by bolt 433, and the output shaft 5 can also be disassembled when the outer end cover 6 is removed. In addition, the working end 7 can be separated from the output shaft 5. Therefore, when the helical teeth 434 of the anti-torsion block 431 and the helical teeth 52 of the output shaft 5 are worn, they can be replaced in time, with fewer replacement parts, reducing costs and increasing efficiency.

[0049] It should be noted that when the output shaft 5 and the anti-torsion block 431 rotate synchronously, the helical gear 434 and the helical gear 52 are in a meshing state and rotate synchronously. There is a certain resistance when they separate. At the same time, the main structure 1 has its own gravity. When the main structure 1 is not subjected to a downward external force, the elastic force of the strong spring 53 can effectively separate the helical gear 434 and the helical gear 52. Even if the strong spring 53 becomes fatigued, it is easy to remove and replace it.

[0050] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] The above provides a detailed description of the lithium-ion brushless working tool with anti-torsion function provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The above description of the embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A lithium-ion battery-powered brushless work tool with anti-torsion function, comprising a main unit structure, characterized in that, The lower end of the main unit structure has a detachable outer shell, inside which a transmission component is installed. Inside the outer shell is an output shaft extending downwards. The lower end of the outer shell is detachably fixed with an outer end cover that limits the position of the output shaft. The lower end of the output shaft is equipped with a detachable working end. The transmission assembly includes a third shaft, which is sleeved with the output shaft. A strong spring supports the two. When the main structure is manually pressed down, the inner end of the third shaft engages with the upper end of the output shaft, allowing power to be transmitted from the third shaft to the output shaft. When the main structure is not pressed down, the inner end of the third shaft separates from the upper end of the output shaft, and power transmission is canceled.

2. The lithium-ion brushless work tool with anti-torsion function according to claim 1, characterized in that, The main unit has a controller and a motor inside, and a battery pack at the top for use as a power source. The motor output end inside the main unit has an inner shaft that extends downwards, which is used to drive the transmission components to rotate.

3. The lithium-ion brushless work tool with anti-torsion function according to claim 2, characterized in that, The transmission assembly also includes shaft one and shaft two; The lower end of the main structure and the inner wall of the outer shell are integrally formed with several mating cavities. Bearings are installed near the upper and lower ends of shaft one, shaft two and shaft three. The bearings on shaft one, shaft two and shaft three are respectively embedded into the mating cavities of the corresponding main structure and outer shell. A primary gear 1 and a driven gear 1 are fixed on shaft 1, and a primary gear 2 and a driven gear 2 are fixed on shaft 2. A primary gear 3 is fixed on shaft 3. The primary gear 1 meshes with the outer side of the inner shaft, the driven gear 1 meshes with the primary gear 2, and the driven gear 2 meshes with the primary gear 3, which is used for the transmission of kinetic energy.

4. The lithium-ion brushless work tool with anti-torsion function according to claim 3, characterized in that, The diameter of primary gear one is larger than the diameter of driven gear one, and the diameter of primary gear two is larger than the diameter of driven gear two.

5. The lithium-ion brushless work tool with anti-torsion function according to claim 1, characterized in that, The lower end of the shaft is a tube, and an anti-twist block is installed inside it. The downward-facing side of the anti-twist block has an outward-protruding helical tooth. The upper end of the output shaft extends into the shaft tube, and its upper end face has an integral helical tooth two that mates with helical tooth one. A strong spring is installed inside the output shaft, and the upper end of the strong spring extends upward out of the output shaft.

6. The lithium-ion brushless work tool with anti-torsion function according to claim 5, characterized in that, The upper end of the anti-torsion block is polygonal, and its upper end fits into the inside of the shaft tube. A bolt that is fixed to the shaft tube passes through the axis of the anti-torsion block, making the anti-torsion block detachable. The upper end of the strong spring is pressed against the bolt.

7. The lithium-ion brushless work tool with anti-torsion function according to claim 5, characterized in that, The lower end of the anti-twist block is recessed on the side that mates with the upper end of the output shaft, while the upper end of the output shaft is protruding on the side that mates with the anti-twist block. When the anti-twist block and the output shaft mate, they fit together perfectly.

8. The lithium-ion brushless work tool with anti-torsion function according to claim 5, characterized in that, The outer casing has a clamping cavity inside, and the axis of the clamping cavity coincides with the axis of the output shaft. The output shaft has an integral ring-shaped limiting plate layer outside, which is set in the clamping cavity and the outer arc wall of the limiting plate layer fits against the inner wall of the clamping cavity. When the main unit structure is not pressed, the limiting plate layer is in contact with the inner wall of the outer end cover.

9. The lithium-ion brushless work tool with anti-torsion function according to claim 1, characterized in that, The lower end of the output shaft is a sleeve-shaped structure with threads on the inner wall, and the working end is a stirring rod. The working end is threadedly connected to the lower end of the output shaft. The lower end of the stirring rod is a circular structure for contact, and the upper surface of the circular structure has spiral blades for stirring.

10. The lithium-ion brushless work tool with anti-torsion function according to claim 1, characterized in that, The lower end of the output shaft is a rod-shaped structure extending downwards, and the working end is a ground drill that fits into the rod-shaped structure at the lower end of the output shaft. A transverse pin for limiting the position passes through the part where the working end fits into the output shaft.

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