Handheld tree trunk whitening device

Abstract

The utility model discloses a handheld tree trunk whitewashing device which comprises a brush handle and a roller, the brush handle comprises a frame body, a first rotating arm and a second rotating arm, the first rotating arm and the second rotating arm are oppositely arranged, the first rotating arm is connected with the frame body in a pivoted mode, the second rotating arm is connected with the frame body in a pivoted mode, and the two ends of the roller are connected with the first rotating arm and the second rotating arm respectively. The roller comprises a flexible sleeve body, and the flexible sleeve body is made of bendable cloth, so that when a user holds the whitewashing device to roll and brush a plant trunk, the middle of the roller is stressed, and the two ends of the roller are pulled towards the middle, so that the two ends of the roller can move close to each other relatively, and the flexible sleeve body is in a bent state; the flexible sleeve body in the bent state can be attached to the arc-shaped outer circumferential surface of the trunk in a large area, so that a user can roll and brush the trunk efficiently.

Description

Technical Field

[0001] This utility model relates to the field of tree trunk whitening technology, and in particular to a handheld tree trunk whitening device. Background Technology

[0002] With the improvement of living standards, land greening, urban greening, roadside greening, and other forms of greening can effectively improve environmental sanitation and play multiple roles in maintaining ecological balance. Greening refers to the planting of protective forests, roadside trees, crops, and various plants in residential areas and parks.

[0003] Especially for tree planting, tree whitewashing is used to provide the tree's growing environment with many benefits, such as sterilization, insect control, protection against frost and sunburn, and beautification. Tree trunk whitewashing usually refers to the process of applying a mixture of quicklime, water, salt, adhesive, and lime-sulfur mixture to the base of the tree trunk. The whitewashing is mainly done before the soil freezes in winter.

[0004] In the prior art, Chinese Patent Publication No. CN211882701U discloses a pest and disease control device for forestry trees. The key features of this device include a telescopic rod, one end of which is fixedly connected to a connecting frame. A roller assembly is fixedly installed on the rear side of one end of the connecting frame. The roller assembly includes an inner core cylinder, with a brush sleeve fitted around its outer side. A fixed shaft is connected through the inner side of the inner core cylinder. The height of the device can be adjusted via the telescopic rod, making it suitable for different users and fruit trees. However, during use, because the outer circumferential surface of the tree trunk is curved, the roller assembly cannot properly conform to the outer circumferential surface of the trunk. Each time the user scrapes the trunk up and down, the area scraped is small, requiring multiple scraping motions, which is time-consuming, laborious, and results in poor brushing effectiveness. Utility Model Content

[0005] The purpose of this invention is to provide a handheld tree trunk whitening tool, which aims to at least solve the technical problem that the existing roller brush cannot adhere to the arc-shaped outer circumference surface of the tree trunk over a large area.

[0006] To achieve the above objectives, the utility model provides a handheld tree trunk whitewasher, the key features of which include:

[0007] The brush handle includes a frame and a first rotating arm and a second rotating arm disposed opposite to each other, the first rotating arm being pivotally connected to the frame and the second rotating arm being pivotally connected to the frame;

[0008] A roller, the two ends of which are respectively connected to the first rotating arm and the second rotating arm, the roller includes a flexible sleeve, and the flexible sleeve is a bendable fabric;

[0009] An elastic element is provided to apply a force to the first rotating arm (120) and the second rotating arm (130) in a direction away from each other, thereby keeping the flexible sleeve (210) in a straight state.

[0010] In the roller brush state, the middle part of the flexible sleeve is subjected to force, and the two ends of the roller can move closer to each other, thereby realizing that the flexible sleeve is in a bending state.

[0011] Furthermore, the roller also includes a first roller group and a second roller group, with the two ends of the flexible sleeve respectively fitted onto the first roller group and the second roller group.

[0012] Furthermore, the first rotating arm is provided with a first support shaft, and the first roller assembly is rotatably mounted on the first support shaft; the second rotating arm is provided with a second support shaft, and the second roller assembly is rotatably mounted on the second support shaft.

[0013] Furthermore, a first spring is sleeved on the first support shaft, and a second spring is sleeved on the second support shaft. A first abutting protrusion is provided at one end of the first support shaft facing the second support shaft, and a second abutting protrusion is provided at one end of the second support shaft facing the first support shaft. One end of the first spring abuts against the first roller assembly, and the other end of the first spring abuts against the first abutting protrusion. One end of the second spring abuts against the second roller assembly, and the other end of the second spring abuts against the second abutting protrusion.

[0014] Furthermore, the first roller group and the second roller group have the same structure, and the first roller group or the second roller group includes:

[0015] A first end cap is rotatably mounted on the first support shaft or the second support shaft, and an accommodating groove is provided at the outward end of the first end cap.

[0016] The second end cap is located on the side of the first end cap facing outward, so that by retracting one end of the flexible sleeve into the receiving groove and fastening the second end cap to the first end cap, one end of the flexible sleeve is fitted onto the first roller group or the second roller group.

[0017] Furthermore, the first rotating arm is provided with a first through hole, through which the first support shaft passes to the first rotating arm. The second rotating arm is provided with a second through hole, through which the second support shaft passes to the second rotating arm. The first support shaft is provided with a first fixing component, and the second support shaft is provided with a second fixing component, so that the first support shaft is mounted on the first rotating arm by the first fixing component, and the second support shaft is mounted on the second rotating arm by the second fixing component.

[0018] Furthermore, both the outer peripheral surfaces of the first support shaft and the second support shaft are provided with external threads. The first fixing component and the second fixing component have the same structure. The first fixing component or the second fixing component includes a first nut and a second nut. The first nut and the second nut are respectively disposed on both sides of the first through hole or both sides of the second through hole, so that by tightening the first nut and the second nut, the first nut and the second nut can be moved towards each other, so as to install the first support shaft onto the first rotating arm or the second support shaft onto the second rotating arm.

[0019] Furthermore, the elastic element includes a first torsion spring and a second torsion spring. The first rotating arm is rotatably connected to the brush handle via a first pivot, and the first torsion spring is disposed on the first pivot. The second rotating arm is rotatably connected to the brush handle via a second pivot, and the second torsion spring is disposed on the second pivot, so that the flexible sleeve is in a straightened state by the elastic force of the first torsion spring and the second torsion spring.

[0020] Furthermore, a recessed space is formed between the roller and the frame so that when the flexible sleeve is in a bent state, the flexible sleeve at least partially bends into the recessed space.

[0021] Furthermore, the flexible sleeve is made of an elastic material.

[0022] As can be seen from the above technical solution, the handheld tree trunk whitening device of this utility model has a first rotating arm and a second rotating arm on the frame, and both the first rotating arm and the second rotating arm can rotate on the frame. The two ends of the roller are connected to the first rotating arm and the second rotating arm respectively. The flexible sleeve in the roller is made of bendable fabric. When the user rolls the whitening device on the tree trunk, the middle of the roller is subjected to force, and the two ends of the roller will be subjected to a pulling force towards the middle. The pulling force pulls the first rotating arm and the second rotating arm to rotate, so that the two ends of the roller can move closer to each other, thereby realizing that the flexible sleeve is in a bent state. The flexible sleeve in the bent state can fit the arc-shaped outer circumference surface of the tree trunk over a large area, so that the user can efficiently roll the tree trunk.

[0023] To make the technical concept, other objectives, advantages, features and functions of this utility model clearer and easier to understand, preferred embodiments will be specifically described in the following detailed description, and will be illustrated in conjunction with the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the handheld tree trunk whitening device provided in this application;

[0026] Figure 2 This is an exploded view of the handheld tree trunk whitening device provided in this application;

[0027] Figure 3 This is a right view of the handheld tree trunk whitening device provided in this application;

[0028] Figure 4 This application provides Figure 3 Sectional view at CC;

[0029] Figure 5 This application provides Figure 4 Enlarged view of some of the structures in the image;

[0030] Figure 6 This is an exploded structural diagram of the frame provided in this application;

[0031] The above figures include the following reference numerals:

[0032] 100. Brush handle; 110. Frame; 120. First rotating arm; 123. First support shaft; 123a. First abutment protrusion; 124. First through hole; 130. Second rotating arm; 133. Second support shaft; 133a. Second abutment protrusion; 134. Second through hole; 200. Roller; 210. Flexible sleeve; 220. First roller assembly; 230. Second roller assembly; 240. First end cap; 241. Receiving groove; 250. Second end cap; 300. First pivot; 310. First torsion spring; 400. Second pivot; 410. Second torsion spring; 500. First fixing component; 510. Second fixing component; 520. First nut; 530. Second nut; 600. First spring; 610. Second spring. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Please refer to the following: Figures 1 to 5 This embodiment provides a handheld tree trunk whitening device, including a brush handle 100 and a roller 200. The brush handle 100 includes a frame 110 and a first rotating arm 120 and a second rotating arm 130 arranged opposite to each other. The first rotating arm 120 is pivotally connected to the frame 110, and the second rotating arm 130 is pivotally connected to the frame 110. The two ends of the roller 200 are respectively connected to the first rotating arm 120 and the second rotating arm 130. The roller 200 includes a flexible sleeve 210, and the flexible sleeve 210 is a bendable fabric, preferably plush fabric, so that when the roller is in the brushing state, the middle part of the flexible sleeve 210 is subjected to force, and the two ends of the roller 200 can move closer to each other, thereby realizing that the flexible sleeve 210 is in a bent state.

[0035] As can be seen, the handheld tree trunk whitening device of this utility model has a first rotating arm 120 and a second rotating arm 130 arranged on the frame 110, and both the first rotating arm 120 and the second rotating arm 130 can rotate on the frame 110. The two ends of the roller 200 are connected to the first rotating arm 120 and the second rotating arm 130 respectively. The flexible sleeve 210 in the roller 200 is made of bendable fabric. When the user rolls the whitening device on the tree trunk, the middle of the roller 200 is subjected to force, and the two ends of the roller 200 will be subjected to a pulling force towards the middle. The pulling force pulls the first rotating arm 120 and the second rotating arm 130 to rotate, so that the two ends of the roller 200 can move relatively closer to each other, thereby realizing that the flexible sleeve 210 is in a bent state. The flexible sleeve 210 in the bent state can fit the arc-shaped outer circumference surface of the tree trunk over a large area, so that the user can efficiently roll the tree trunk.

[0036] Furthermore, the roller 200 also includes a first roller group 220 and a second roller group 230, with the two ends of the flexible sleeve 210 respectively sleeved on the first roller group 220 and the second roller group 230.

[0037] The first roller group 220 and the second roller group 230 provide a stable end support structure for the flexible sleeve 210, which enables the flexible sleeve 210 to maintain a relatively stable state during operation. This prevents the flexible sleeve 210 from falling off or shifting during the whitening process, ensuring the smooth progress of the whitening work. Furthermore, when the flexible sleeve 210 needs to be replaced, it can simply be removed from the first roller group 220 and the second roller group 230 and a new flexible sleeve 210 can be put on, reducing maintenance costs and difficulty and improving the ease of use of the equipment.

[0038] Furthermore, a first support shaft 123 is provided on the first rotating arm 120, and the first roller assembly 220 is rotatably mounted on the first support shaft 123. A second support shaft 133 is provided on the second rotating arm 130, and the second roller assembly 230 is rotatably mounted on the second support shaft 133. The first support shaft 123 and the second support shaft 133 provide a stable support structure for the first roller assembly 220 and the second roller assembly 230, ensuring the stability of the roller 200 during operation.

[0039] Preferably, a first spring 600 is sleeved on the first support shaft 123, and a second spring 610 is sleeved on the second support shaft 133. A first abutting protrusion 123a is provided at one end of the first support shaft 123 facing the second support shaft 133, and a second abutting protrusion 133a is provided at one end of the second support shaft 133 facing the first support shaft 123. One end of the first spring 600 abuts against the first roller assembly 220, and the other end of the first spring 600 abuts against the first abutting protrusion 123a. The second spring... One end of the spring 610 abuts against the second roller assembly 230, and the other end of the second spring 610 abuts against the second abutment protrusion 133a. By setting the first spring 600 and the second spring 610, the flexible sleeve 210 can be kept in a straight state so that the paint can be applied more evenly. When the plant trunk is brushed, the first spring 600 and the second spring 610 can be compressed. The first spring 600 and the second spring 610 do not affect the bending of the flexible sleeve 210.

[0040] Preferably, the first roller group 220 and the second roller group 230 have the same structure. The first roller group 220 or the second roller group 230 includes a first end cap 240 and a second end cap 250. The first end cap 240 is rotatably mounted on the first support shaft 123 or the second support shaft 133. The outward end of the first end cap 240 is provided with a receiving groove 241. The second end cap 250 is located on the outward side of the first end cap 240 so that by retracting one end of the flexible sleeve 210 into the receiving groove 241 and fastening the second end cap 250 onto the first end cap 240, one end of the flexible sleeve 210 is sleeved on the first roller group 220 or the second roller group 230. Both the first end cap 240 and the second end cap 250 are provided with clearance holes for the first support shaft 123 or the second support shaft 133 to pass through.

[0041] By retracting the end of the flexible sleeve 210 into the receiving groove 241 of the first end cap 240 and fastening the second end cap 250, the flexible sleeve 210 can be quickly installed and disassembled. This design does not require complicated tools or professional skills, and operators can replace the flexible sleeve 210 in a short time, which significantly improves maintenance efficiency. It is especially suitable for situations where the flexible sleeve 210 needs to be replaced frequently or in multiple scenarios. Moreover, the friction between the second end cap 250 and the first end cap 240 can effectively fix the flexible sleeve 210, and the flexible sleeve 210 will not easily fall off during use.

[0042] In one possible implementation, a slot is provided at the middle position of the bottom wall of the receiving groove 241, and a snap-fit ​​protrusion is provided at the middle position of the end of the second end cap 250. By inserting the end of the second end cap 250 into the receiving groove 241, the end of the second end cap 250 presses the annular opening of one end of the flexible sleeve 210 against the bottom wall of the receiving groove 241. The snap-fit ​​protrusion is snapped into the slot, so that the second end cap 250 is fixed relative to the first end cap 240, and the annular opening of one end of the flexible sleeve 210 is fixedly installed between the second end cap 250 and the first end cap 240. In this way, the flexible sleeve 210 will not easily fall off during use.

[0043] In another possible implementation, one end of the flexible sleeve 210 is retracted into the receiving groove 241, causing the opening of the flexible sleeve 210 to unfold against the bottom wall of the receiving groove 241. The end of the second end cap 250 is inserted into the receiving groove 241, so that the end of the second end cap 250 presses the annular opening of the flexible sleeve 210 against the bottom wall of the receiving groove 241. At the same time, a first through hole is provided on the first end cap 240 and a second through hole is provided on the second end cap 250 corresponding to the first through hole. By passing a bolt through the first through hole and the second through hole in sequence, so that the end of the bolt protrudes from the second through hole, and a nut is screwed into the end of the bolt to fix the second end cap 250 relative to the first end cap 240. In this way, one end of the flexible sleeve 210 can be fixedly installed. The installation of the other end of the flexible sleeve 210 is the same. In this way, the flexible sleeve 210 will not easily fall off during use.

[0044] Preferably, the first rotating arm 120 is provided with a first through hole 124, and the first support shaft 123 passes through the first through hole 124 to the first rotating arm 120. The second rotating arm 130 is provided with a second through hole 134, and the second support shaft 133 passes through the second through hole 134 to the second rotating arm 130. The first support shaft 123 is provided with a first fixing component 500, and the second support shaft 133 is provided with a second fixing component 510, so that the first support shaft 123 is installed on the first rotating arm 120 by the first fixing component 500, and the second support shaft 133 is installed on the second rotating arm 130 by the second fixing component 510.

[0045] With this configuration, the first support shaft 123 is detachably mounted on the first rotating arm 120, and the second support shaft 133 is detachably mounted on the second rotating arm 130, so that the whitening device can be disassembled into multiple parts when not in use, reducing space occupation, improving portability, and enhancing the versatility and flexibility of the equipment.

[0046] Preferably, the outer peripheral surfaces of the first support shaft 123 and the second support shaft 133 are both provided with external threads. The first fixing component 500 and the second fixing component 510 have the same structure. The first fixing component 500 or the second fixing component 510 includes a first nut 520 and a second nut 530. The first nut 520 and the second nut 530 are respectively disposed on both sides of the first through hole 124 or the second through hole 134, so that by turning the first nut 520 and the second nut 530, the first nut 520 and the second nut 530 can move towards each other, so as to install the first support shaft 123 onto the first rotating arm 120 or the second support shaft 133 onto the second rotating arm 130.

[0047] The first support shaft 123 is firmly fixed to the first rotating arm 120 and the second support shaft 133 is firmly fixed to the second rotating arm 130 by tightening the first nut 520 and the second nut 530 on opposite sides of the first through hole 124 or the second through hole 134. This structure can withstand the axial and radial forces during the brushing process, and the tightening of the nuts does not require professional tools. Operators can complete the installation or removal of the support shaft end by simple manual or wrench operation.

[0048] In this embodiment, the first rotating arm 120 is rotatably connected to the brush handle 100 via a first pivot 300, and a first torsion spring 310 is provided on the first pivot 300. The second rotating arm 130 is rotatably connected to the brush handle 100 via a second pivot 400, and a second torsion spring 410 is provided on the second pivot 400, so that the flexible sleeve 210 is in a straight state by the elastic force of the first torsion spring 310 and the second torsion spring 410.

[0049] The elastic force of the first torsion spring 310 and the second torsion spring 410 keeps the flexible sleeve 210 straight when it is not subjected to external force. When the whitening device leaves the tree trunk surface or completes a whitening operation, the first rotating arm 120 and the second rotating arm 130 can automatically return to their initial positions.

[0050] In this embodiment, a recessed space is formed between the roller 200 and the frame 110 so that when the flexible sleeve 210 is in a bent state, the flexible sleeve 210 is at least partially bent into the recessed space. When the flexible sleeve 210 is bent to fit tree trunks of different diameters, the recessed space provides sufficient accommodating area, allowing the flexible sleeve 210 to bend and deform smoothly without being unable to fit the tree trunk due to space limitations, thus ensuring that the whitewasher can adapt to tree trunks of various thicknesses.

[0051] In this embodiment, the flexible sleeve 210 is made of elastic material. The elastic material allows the flexible sleeve 210 to automatically adjust its shape according to the shape and thickness of the tree trunk, and fit tightly against the surface of the tree trunk. Whether the tree trunk is straight or has a certain curvature or is irregular, it can ensure that the whitewash is applied evenly and avoid missed or uneven application, thereby improving the quality of whitewashing.

[0052] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0053] This utility model discloses a handheld tree trunk whitening device. A first rotating arm 120 and a second rotating arm 130 are mounted on a frame 110, both of which can rotate on the frame 110. The two ends of a roller 200 are connected to the first rotating arm 120 and the second rotating arm 130, respectively. The flexible sleeve 210 within the roller 200 is made of bendable fabric. When the user uses the handheld whitening device to brush the tree trunk, the center of the roller 200 is subjected to force, and the two ends of the roller 200 are pulled inwards. This pulling force causes the first rotating arm 120 and the second rotating arm 130 to rotate, allowing the two ends of the roller 200 to move closer together, thus placing the flexible sleeve 210 in a bent state. In this bent state, the flexible sleeve 210 can conform to the large-area arc-shaped outer circumference of the tree trunk, enabling the user to efficiently brush the tree trunk.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0055] In the description of this application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "lateral", "longitudinal", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0056] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] Certain terms are used in the specification and claims of this utility model to refer to specific elements. Those skilled in the art will understand that manufacturers may use different names to refer to the same components, and this document is not intended to distinguish between components that have the same function but different names. In the following specification and claims, words such as “comprising,” “having,” and “including” are open-ended terms and should therefore be interpreted as “containing but not limited to…”.

[0059] Furthermore, it should be noted that in the description of this utility model, the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0060] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A handheld tree trunk whitewashing device, characterized in that, include: The brush handle (100) includes a frame (110) and a first rotating arm (120) and a second rotating arm (130) disposed opposite to each other. The first rotating arm (120) is pivotally connected to the frame (110), and the second rotating arm (130) is pivotally connected to the frame (110). A roller (200) is connected at both ends to the first rotating arm (120) and the second rotating arm (130) respectively. The roller (200) includes a flexible sleeve (210) and the flexible sleeve (210) is a bendable fabric. An elastic element is provided to apply a force to the first rotating arm (120) and the second rotating arm (130) in a direction away from each other, thereby keeping the flexible sleeve (210) in a straight state; In the state of the roller brush, the middle part of the flexible sleeve (210) is subjected to force, and the two ends of the roller (200) can move towards each other to achieve the flexible sleeve (210) in a bent state.

2. The handheld tree trunk whitening device according to claim 1, characterized in that, The roller (200) also includes a first roller group (220) and a second roller group (230), and the two ends of the flexible sleeve (210) are respectively sleeved on the first roller group (220) and the second roller group (230).

3. The handheld tree trunk whitening device according to claim 2, characterized in that, The first rotating arm (120) is provided with a first support shaft (123), and the first roller assembly (220) is rotatably mounted on the first support shaft (123). The second rotating arm (130) is provided with a second support shaft (133), and the second roller assembly (230) is rotatably mounted on the second support shaft (133).

4. The handheld tree trunk whitening device according to claim 3, characterized in that, A first spring (600) is sleeved on the first support shaft (123), and a second spring (610) is sleeved on the second support shaft (133). A first abutting protrusion (123a) is provided at one end of the first support shaft (123) facing the second support shaft (133), and a second abutting protrusion (133a) is provided at one end of the second support shaft (133) facing the first support shaft (123). One end of the first spring (600) abuts against the first roller assembly (220), and the other end of the first spring (600) abuts against the first abutting protrusion (123a). One end of the second spring (610) abuts against the second roller assembly (230), and the other end of the second spring (610) abuts against the second abutting protrusion (133a).

5. The handheld tree trunk whitening device according to claim 3, characterized in that, The first roller group (220) and the second roller group (230) have the same structure, and the first roller group (220) or the second roller group (230) includes: A first end cap (240) is rotatably mounted on the first support shaft (123) or the second support shaft (133), and an accommodating groove (241) is provided at the outward end of the first end cap (240). The second end cap (250) is located on the outward side of the first end cap (240) so that one end of the flexible sleeve (210) is folded into the receiving groove (241) and the second end cap (250) is fastened to the first end cap (240) so that one end of the flexible sleeve (210) is sleeved on the first roller group (220) or the second roller group (230).

6. The handheld tree trunk whitening device according to claim 3, characterized in that, The first rotating arm (120) is provided with a first through hole (124), and the first support shaft (123) passes through the first through hole (124) to the first rotating arm (120). The second rotating arm (130) is provided with a second through hole (134), and the second support shaft (133) passes through the second through hole (134) to the second rotating arm (130). The first support shaft (123) is provided with a first fixing component (500), and the second support shaft (133) is provided with a second fixing component (510), so that the first support shaft (123) is installed on the first rotating arm (120) by the first fixing component (500), and the second support shaft (133) is installed on the second rotating arm (130) by the second fixing component (510).

7. The handheld tree trunk whitening device according to claim 6, characterized in that, The outer peripheral surfaces of the first support shaft (123) and the second support shaft (133) are both provided with external threads. The first fixing component (500) and the second fixing component (510) have the same structure. The first fixing component (500) or the second fixing component (510) includes a first nut (520) and a second nut (530). The first nut (520) and the second nut (530) are respectively disposed on both sides of the first through hole (124) or on both sides of the second through hole (134). By twisting the first nut (520) and the second nut (530), the first nut (520) and the second nut (530) move towards each other, so as to install the first support shaft (123) onto the first rotating arm (120) or install the second support shaft (133) onto the second rotating arm (130).

8. The handheld tree trunk whitening device according to any one of claims 1 to 7, characterized in that, The elastic element includes a first torsion spring (310) and a second torsion spring (410). The first rotating arm (120) is rotatably connected to the brush handle (100) via a first pivot (300). The first torsion spring (310) is disposed on the first pivot (300). The second rotating arm (130) is rotatably connected to the brush handle (100) via a second pivot (400). The second torsion spring (410) is disposed on the second pivot (400) so that the flexible sleeve (210) is in a straightened state by the elastic force of the first torsion spring (310) and the second torsion spring (410).

9. The handheld tree trunk whitening device according to any one of claims 1 to 7, characterized in that, A recessed space is formed between the roller (200) and the frame (110) so that when the flexible sleeve (210) is in a bent state, the flexible sleeve (210) bends into the recessed space at least partially.

10. The handheld tree trunk whitening device according to any one of claims 1 to 7, characterized in that, The flexible sleeve (210) is made of elastic material.

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