Pruning device

Abstract

The trimming device comprises an operation assembly, a connecting piece, a driving piece, an expansion piece, a clamping and embedding piece and a shearing piece, the operation assembly, the connecting piece, the driving piece, the expansion piece, the clamping and embedding piece and the shearing piece are detachably connected, a user is allowed to rapidly replace or upgrade parts according to different use scenes and requirements, and the trimming efficiency is improved. The shearing piece is pressed downwards through the pressing block to be fixed in the positioning groove of the clamping and embedding piece, the position of the shearing piece is fixed through the locking mechanism, and it is guaranteed that the shearing piece cannot be loosened in the working process through the pre-tightening force of the pressing block. And the pressing block is matched with the positioning groove, so that the shearing piece cannot loosen or fall off during high-speed rotation or strong shearing, and the phenomenon of'fly cutter 'is avoided. The shearing piece is effectively prevented from vibrating and shifting in the working process, the stability and reliability of the equipment are improved, the use efficiency and reliability of the equipment are improved, and the user experience is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of gardening equipment technology, and in particular to a pruning device. Background Technology

[0002] With the development of agriculture, forestry, and landscaping, pruning has become increasingly important. While traditional pruning tools are simple and easy to use, they are inefficient and labor-intensive when faced with large-scale operations or complex environments. In practice, pruning devices need to be able to adapt to branches of different heights and diameters, while ensuring safety and ease of operation.

[0003] In actual operation of existing shearing devices, "flying blades" and "blade retraction" are common malfunctions. Flying blades refer to the shearing blades detaching from their fixed position or even flying out of the equipment due to external force or structural problems during use. This is an extremely dangerous malfunction that can lead to equipment damage, personnel injury, and even safety accidents. Blade retraction refers to the blades moving backward or retracting during the shearing process due to external force or structural problems, resulting in poor shearing effects or inability to complete the shearing. This phenomenon affects shearing efficiency and quality and may even lead to equipment malfunction.

[0004] Existing pruning devices have many shortcomings in terms of functionality, portability, safety, cost, and cutting effect, making it difficult to meet the needs of modern agriculture, forestry, and landscaping maintenance for efficient, flexible, safe, and precise pruning. Utility Model Content

[0005] In view of the deficiencies in the prior art, this application provides a pruning device to solve the problems of low reliability and safety of the pruning devices in the prior art.

[0006] The above-mentioned objectives of this application are mainly achieved through the following technical solutions:

[0007] A trimming device, the trimming device comprising:

[0008] An operating component having a connecting end and a gripping end for holding;

[0009] A connector, detachably connected to the connecting end, and the connector having a mounting position;

[0010] A driving component is detachably connected to the connector, the driving component including a fixing part fixed on the mounting position and a rotatable output end;

[0011] An extension component is detachably connected to the output end and rotates synchronously with the output end. The extension component includes a positioning section and a threaded section arranged coaxially, and a pressure block is threadedly connected to the threaded section.

[0012] An insert is mounted on the drive member. The insert has a positioning hole that mates with the positioning section so that the insert rotates synchronously with the extension member. The top of the insert has a positioning groove.

[0013] The shearing component has a central through hole and is detachably connected to the threaded section. The pressure block can press the shearing component down into the positioning groove. The shearing component has at least two shearing blades.

[0014] In an optional embodiment, the extension, the drive, the insert, and the shearing member are arranged coaxially.

[0015] In an optional embodiment, the extension includes a base with a connection hole, and the base is fixedly connected to the output end by fixing bolts.

[0016] In an optional embodiment, the threaded segment is provided with a radially extending limiting hole, and a limiting part with a length greater than the outer diameter of the threaded segment is movably arranged in the limiting hole to limit the separation of the pressure block from the threaded segment.

[0017] In an optional embodiment, the positioning segment and the positioning hole are respectively configured as corresponding polygonal shapes.

[0018] In an optional embodiment, two positioning strips are provided in the positioning groove, and the two positioning strips are symmetrically arranged on both sides of the positioning hole at intervals. The shearing member is provided with two mating grooves corresponding to the positioning strips, so that when the shearing member is arranged in the positioning groove, the positioning strips extend into the mating grooves.

[0019] In an optional embodiment, the positioning strip and the mating groove are respectively configured in an arc shape.

[0020] In an optional embodiment, the connector is coaxially sleeved with the connecting end, and the mounting position is arranged radially with respect to the connector, such that the center line of the drive member is arranged perpendicular to the center line of the connector.

[0021] In an optional embodiment, the trimming device further includes a control component for controlling the drive component. The control component is disposed on the operating assembly and is electrically connected to the drive component by a control line. The operating assembly includes multiple coaxially sleeved operating units, each of which has a double-layer hollow structure. The connector has a hollow structure, and the control line passes sequentially through the connector and the operating unit.

[0022] In an optional embodiment, the driving component is an external rotor motor, the fixing part is a stator base fixed on the connecting member, and the output end is an external rotor.

[0023] Compared with the prior art, the advantages of this application are:

[0024] The trimming device of this application includes an operating component, a connector, a driving component, an extension component, a locking component, and a cutting component. The operating component has a connecting end and a gripping end for holding. The connector is detachably connected to the connecting end and has a mounting position. The driving component is detachably connected to the connector and includes a fixing part fixed to the mounting position and a rotatable output end. The extension component is detachably connected to the output end and rotates synchronously with the output end. The extension component includes a positioning section and a threaded section arranged coaxially, and a pressure block is threadedly connected to the threaded section. The locking component covers the driving component and has a positioning hole that mates with the positioning section so that the locking component rotates synchronously with the extension component. The top of the locking component has a positioning groove. The cutting component has a through hole in the center and is detachably connected to the threaded section. The pressure block can press the cutting component down into the positioning groove. The cutting component has at least two cutting blades.

[0025] The detachable connections between operating components, connectors, drivers, extension components, inserts, and cut-out components allow users to quickly replace or upgrade parts according to different usage scenarios and needs.

[0026] The shearing component is fixed in the positioning groove of the insert by a pressure block. This locking mechanism not only secures the position of the shearing component but also ensures that it will not loosen during operation through the pre-tightening force of the pressure block. The cooperation between the pressure block and the positioning groove ensures that the shearing component will not loosen or fall off during high-speed rotation or heavy shearing, avoiding the "flying knife" phenomenon. This effectively prevents vibration and displacement of the shearing component during operation, improving the stability and reliability of the equipment. This not only increases the efficiency and reliability of the equipment but also significantly enhances the user experience. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the pruning device provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the card insert provided in the embodiments of this application;

[0030] Figure 3An exploded view of some components of the trimming device provided in an embodiment of this application;

[0031] In the diagram: 101, operating component; 102, connector; 103, mounting position; 104, drive component; 200, extension component; 201, positioning section; 202, threaded section; 203, pressure block; 204, base; 205, connecting hole; 206, limiting hole; 300, insert; 301, positioning hole; 302, positioning groove; 303, positioning strip; 400, shearing component; 401, mating groove; 402, shearing blade. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0033] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a trimming device provided in an embodiment of this application. The trimming device includes an operating component 101, a connecting member 102, a driving member 104, an extension member 200, a locking member 300, and a cutting member 400, wherein:

[0034] The operating component 101 has a connecting end and a gripping end for holding. The operating component 101 is used for user gripping and operation. The connecting end is used to connect with the connector 102 to achieve stable structural support. The gripping end provides a comfortable grip experience and can be equipped with anti-slip material to ensure stable operation.

[0035] The grip material can be selected from rubber, plastic or metal, depending on the usage environment and user needs.

[0036] The connector 102 is detachably connected to the connecting end, and the connector 102 has a mounting position 103 for fixing the drive component 104. The connector 102 adopts a detachable design, which facilitates replacement and maintenance. It is easy to connect to the operating component 101 and the drive component 104. This improves the maintainability and flexibility of the equipment.

[0037] like Figure 1As shown, the drive member 104 is detachably connected to the connector 102. The drive member 104 includes a fixing part fixed to the mounting position 103 and a rotatable output end. The drive member 104 is the power source of the trimming device, including the fixing part and the rotatable output end. The fixing part is mounted on the mounting position 103 of the connector 102, and the output end provides rotational power.

[0038] The drive component 104 can be a DC motor, AC motor, or brushless motor, depending on the power requirements of the equipment and the application scenario. The drive component 104 can be fixed by bolts, snap rings, or adhesive, with the specific choice depending on structural strength and ease of installation.

[0039] like Figure 1 , Figure 2 as well as Figure 3 As shown, Figure 2 This is a schematic diagram of the structure of the card insert 300 provided in the embodiments of this application; Figure 3 This is an exploded view of some components of the trimming device provided in the embodiment of this application; the extension 200 is detachably connected to the output end and rotates synchronously with the output end. The extension 200 includes a positioning section 201 and a threaded section 202 arranged coaxially. A pressure block 203 is threadedly connected to the threaded section 202.

[0040] The extension component 200 is connected to the output end of the drive component 104 and rotates synchronously with the output end. The extension component 200 includes a coaxially arranged positioning section 201 and a threaded section 202. A pressure block 203 is connected to the threaded section 202 for fixing the shearing component 400. The extension component 200 is fixed by the threaded connection and the pressure block 203, ensuring the stability and replaceability of the shearing component 400. The axial arrangement of the extension component 200 improves power transmission efficiency and shearing accuracy. The positioning section 201 can be circular, polygonal, or other irregularly shaped, selected according to shearing requirements and structural strength.

[0041] The insert 300 is mounted on the drive member 104. The insert 300 is provided with a positioning hole 301 that cooperates with the positioning section 201 so that the insert 300 and the extension member 200 rotate synchronously. The top of the insert 300 is provided with a positioning groove 302.

[0042] like Figure 1 , Figure 2 as well as Figure 3As shown, the insert 300 is mounted on the drive member 104. The insert 300 has a positioning hole 301 that mates with the positioning section 201 of the extension member 200, and a positioning groove 302 on its top. The insert 300 enables synchronous rotation of the extension member 200 and the shearing member 400. The fit between the positioning hole 301 and the positioning groove 302 ensures precise connection and synchronous rotation between components, improving the overall performance of the equipment.

[0043] The shearing member 400 has a through hole in the center and is detachably connected to the threaded section 202. The pressure block 203 can press the shearing member 400 into the positioning groove 302. The shearing member 400 is provided with at least two shearing blades 402.

[0044] The shearing component 400 is the actuating part of the trimming device. It has a central through hole and is mounted on the threaded section 202, connecting to the extension component 200. The pressure block 203 presses the shearing component 400 down into the positioning groove 302 of the insert 300, ensuring the stability of the shearing component 400 during operation. The shearing component 400 has at least two shearing blades 402 for completing the trimming task during rotation.

[0045] The number and shape of the shearing blades 402 can be adjusted according to the material and size of the object being trimmed, such as increasing the number of shearing blades 402 to improve shearing efficiency. The shearing component 400 can be made of high-carbon steel, alloy steel, or ceramic material.

[0046] like Figure 1 , Figure 2 as well as Figure 3As shown, in an optional embodiment, the operating principle of the trimming device in this application is as follows: the trimming device includes an operating component 101, a connector 102, a driving component 104, an extension component 200, a snap-fit ​​component 300, and a cutting component 400. The operating component 101 has a connecting end and a gripping end for holding. The connector 102 is detachably connected to the connecting end and has a mounting position 103. The driving component 104 is detachably connected to the connector 102 and includes a fixing part fixed to the mounting position 103 and a rotatable output end. The extension component 200 is detachably connected to the output end and is co-located with the output end. The extension 200 includes a coaxially arranged positioning section 201 and a threaded section 202, with a pressure block 203 threadedly connected to the threaded section 202. A retaining element 300 covers the driving element 104, and the retaining element 300 has a positioning hole 301 that mates with the positioning section 201, allowing the retaining element 300 to rotate synchronously with the extension 200. A positioning groove 302 is provided at the top of the retaining element 300. A shearing element 400 has a through hole at its center and is detachably connected to the threaded section 202. The pressure block 203 can press the shearing element 400 into the positioning groove 302. The shearing element 400 has at least two shearing blades 402.

[0047] The detachable connection between the operating component 101, connector 102, drive component 104, extension component 200, insert component 300, and cutter component 400 allows users to quickly replace or upgrade components according to different usage scenarios and needs.

[0048] The shearing component 400 is pressed and fixed within the positioning groove 302 of the insert 300 by the pressure block 203. This locking mechanism not only fixes the position of the shearing component 400, but also ensures that the shearing component 400 will not loosen during operation through the pre-tightening force of the pressure block 203. The cooperation between the pressure block 203 and the positioning groove 302 ensures that the shearing component 400 will not loosen or fall off during high-speed rotation or heavy shearing, avoiding the "flying knife" phenomenon. This effectively prevents the vibration and displacement of the shearing component 400 during operation, improving the stability and reliability of the equipment, thus not only increasing the efficiency and reliability of the equipment, but also significantly enhancing the user experience.

[0049] In an optional embodiment, the extension member 200, the drive member 104, the insert member 300, and the shearing member 400 are arranged coaxially. This coaxial arrangement reduces friction and vibration during power transmission, improving shearing accuracy and equipment lifespan.

[0050] Coaxial arrangement ensures linear power transmission, reducing power loss and vibration caused by eccentricity or angular deviation. It improves shearing accuracy, ensuring the stability of the sheared part 400 during rotation. It reduces vibration and noise during equipment operation, extending equipment lifespan. It enhances the operating experience, reducing user fatigue caused by vibration.

[0051] like Figure 1 , Figure 3 As shown, in an optional embodiment, the extension 200 includes a base 204, which has a connection hole 205, and the base 204 is fixedly connected to the output end by fixing bolts.

[0052] The base 204 serves as the connecting component between the extension 200 and the drive component 104, and is secured with bolts to ensure a firm connection. The base 204 can be made of high-strength aluminum alloy, significantly reducing the weight of the component while maintaining structural strength. This improves the overall stability of the equipment, ensuring it won't loosen under high torque output. The reduced weight makes the equipment easier to carry and operate, especially suitable for handheld trimming devices. The aluminum alloy material is highly corrosion-resistant, making it suitable for harsh outdoor environments.

[0053] like Figure 1 , Figure 2 as well as Figure 3 As shown, in an optional embodiment, the threaded segment 202 is provided with a radially extending limiting hole 206, and a limiting part with a length greater than the outer diameter of the threaded segment 202 is movably arranged in the limiting hole 206 to limit the separation of the pressure block 203 from the threaded segment 202.

[0054] The limiting hole 206 and the limiting part mechanically prevent the pressure block 203 from loosening or falling off the threaded section 202. This prevents the pressure block 203 from loosening due to vibration or impact during operation, ensuring the reliable fixation of the shearing component 400. It also improves equipment safety and avoids accidental injuries caused by parts falling off.

[0055] like Figure 1 , Figure 2 as well as Figure 3 As shown, in an optional embodiment, the positioning segment 201 and the positioning hole 301 are respectively configured as compatible polygonal shapes. The polygonal (e.g., regular hexagonal) positioning segment 201 and positioning hole 301 provide higher positioning accuracy through multiple contact surfaces, reducing relative movement between components. The symmetry of the regular hexagon makes it easier to achieve high-precision fit during machining and assembly. This improves the connection accuracy between components, ensures the stability of power transmission and the rotational accuracy of the shearing component 400, and enhances the overall reliability and service life of the equipment.

[0056] like Figure 1 , Figure 2as well as Figure 3 As shown, in an optional embodiment, two positioning strips 303 are protruding in the positioning groove 302. The two positioning strips 303 are symmetrically arranged on both sides of the positioning hole 301 at intervals. The shearing member 400 is provided with two mating grooves 401 corresponding to the positioning strips 303, so that when the shearing member 400 is arranged in the positioning groove 302, the positioning strips 303 extend into the mating grooves 401.

[0057] The positioning strip 303 and the mating groove 401 further restrict the relative movement of the shearing component 400 through mechanical engagement, ensuring the stability of the shearing component 400 during operation. This prevents the shearing component 400 from shaking or shifting during operation, improves shearing accuracy, and reduces assembly difficulty.

[0058] like Figure 1 , Figure 2 as well as Figure 3 As shown, in an optional embodiment, the positioning strip 303 and the mating groove 401 are respectively configured in an arc shape. The arc-shaped positioning strip 303 and the mating groove 401, through curved surface contact, provide a larger contact area and better stress distribution. This ensures that the shearing member 400 maintains a stable stress state during rotation. It improves the fixing stability of the shearing member 400 and reduces damage caused by stress concentration.

[0059] like Figure 1 , Figure 2 as well as Figure 3 As shown, in an optional embodiment, the connector 102 is coaxially sleeved with the connecting end, and the mounting position 103 is arranged radially with respect to the connector 102, so that the center line of the driving member 104 is arranged perpendicular to the center line of the connector 102.

[0060] The vertical arrangement design makes the overall structure more compact by changing the direction of power transmission, while reducing the lateral dimensions of the equipment. It also improves torsional resistance and reduces structural deformation caused by high torque output.

[0061] In an optional embodiment, the trimming device further includes a control component for controlling the drive component 104. The control component is disposed on the operating assembly 101 and is electrically connected to the drive component 104 by a control line. The operating assembly 101 includes a plurality of coaxially sleeved operating units, each of which has a double-layer hollow structure. The connector 102 has a hollow structure, and the control line is sequentially passed through the connector 102 and the operating unit.

[0062] The control unit achieves precise control of the drive unit 104 via electrical connection. The hollow structure of the operating unit and connector 102 provides a protective channel for the control lines while reducing the weight of the equipment. Users can control the start, stop, and speed adjustment of the drive unit 104 through the control unit. The hollow structure design reduces the weight of the equipment while protecting the control lines from external damage. This enhances the user experience, making it particularly suitable for complex environments or scenarios requiring long-term operation.

[0063] The operating component 101 includes multiple coaxially connected operating units. Each operating unit has a double-layer hollow structure, providing different length configurations to perform trimming operations on work areas of different heights. In addition, the double-layer hollow structure of each operating unit can improve the structural strength of the operating component 101. Furthermore, the material of the operating component 101 can be configured as carbon fiber composite material to improve strength while reducing weight.

[0064] In an optional embodiment, the drive component 104 is an external rotor motor, the fixing part is a stator base 204 fixed to the connector 102, and the output end is an external rotor. The external rotor motor places the rotor externally, directly driving the shearing component 400, reducing power transmission links. The external rotor motor has a compact structure, reducing the size and weight of the equipment, and improving the overall performance and reliability of the equipment.

[0065] It should be understood that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0066] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0067] It should be understood that in the description of this utility model, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship when the disclosed product is used, or the orientation or positional relationship commonly understood by those skilled in the art. 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.

[0068] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0069] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0070] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0071] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0072] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A trimming device, characterized in that, The pruning device comprises: an operating assembly having a connecting end and a holding end for holding; a connecting piece detachably connected to the connecting end and having a mounting position on the connecting piece; a driving piece detachably connected to the connecting piece, the driving piece comprising a fixed part fixed to the mounting position and a rotatable output end; an extension piece detachably connected to the output end and synchronously rotating with the output end, the extension piece comprising a positioning section and a threaded section coaxially arranged, and a pressing block threadedly connected to the threaded section; a clamping piece covering the driving piece, the clamping piece being provided with a positioning hole matched with the positioning section so that the clamping piece synchronously rotates with the extension piece, and the clamping piece being provided with a positioning groove at the top; a shearing piece provided with a through hole at the center and detachably connected to the threaded section, the pressing block being capable of pressing the shearing piece into the positioning groove, and the shearing piece being provided with at least two shearing blades.

2. The trimming device of claim 1, wherein: The extension piece, the driving piece, the clamping piece and the shearing piece are coaxially arranged.

3. The trimming device of claim 1, wherein: The extension piece comprises a base provided with a connecting hole, and the base is fixedly connected to the output end by a fixing bolt.

4. The trimming device of claim 3, wherein: The threaded section is provided with a radially extending limiting hole, and a limiting part with a length greater than the outer diameter of the threaded section is movably arranged in the limiting hole to limit the separation of the pressing block and the threaded section.

5. The trimming device of claim 1, wherein: The positioning section and the positioning hole are respectively configured in a polygonal shape.

6. The trimming device of claim 1, wherein: The positioning groove is provided with two positioning strips protruding inward, the two positioning strips being symmetrically arranged at both sides of the positioning hole, and the shearing piece is provided with two matching grooves corresponding to the positioning strips, so that when the shearing piece is arranged in the positioning groove, the positioning strips extend into the matching grooves.

7. The trimming device of claim 6, wherein: The positioning strips and the matching grooves are respectively configured in an arc shape.

8. The trimming device of claim 1, wherein: The connecting piece is coaxially sleeved with the connecting end, the mounting position is arranged radially with respect to the connecting piece, and the center line of the driving piece is arranged perpendicularly to the center line of the connecting piece.

9. The trimming device of claim 1, wherein: The pruning device further comprises a control piece for controlling the driving piece, the control piece being arranged on the operating assembly and being electrically connected to the driving piece through a control line, the operating assembly comprising a plurality of coaxially sleeved operating units, each operating unit being a double-layer hollow structure, the connecting piece being a hollow structure, and the control line being sequentially arranged in the connecting piece and the operating units.

10. The trimming device of claim 1, wherein: The driving piece is an external rotor motor, the fixed part is a stator base fixed to the connecting piece, and the output end is an external rotor.

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