A mechanical tree whitewashing device for forestry and its use method

Abstract

The present invention discloses a mechanical tree whitewashing device for forestry and its use method, comprising a cross-drive mechanism mounted on a mobile trolley, a reciprocating rotary mechanism mounted on the transmission end of the cross-drive mechanism, a cross-flow hot air blower mounted on the transmission end of the reciprocating rotary mechanism, a flat nickel-titanium memory alloy tube mounted on the air outlet end of the cross-flow hot air blower, a strip-shaped air outlet formed on the bottom of the flat nickel-titanium memory alloy tube on the side away from the cross-flow hot air blower, and a plurality of evenly arranged adaptive spraying mechanisms mounted on the side wall above the strip-shaped air outlet. The present invention addresses the technical field of tree whitewashing. The present invention solves the problems of traditional tree whitewashing devices, such as the difficulty of adapting to the irregular shape of tree trunks, uneven whitewashing, low efficiency, poor functional integration, and untimely drying after spraying, which leads to dripping of whitewashing agent and poor adhesion.

Description

Technical Field

[0001] The present invention relates to the technical field of tree whitewashing, and in particular to a mechanical tree whitewashing device for forestry and a method of using the same. Background Art

[0002] In traditional forestry tree whitewashing operations, the encircling structure of whitewashing equipment has always been cumbersome to operate and has poor adaptability. Most devices use a rigid encircling structure, requiring manual adjustment of the encircling components' position and angle before operation to accommodate tree trunks of varying thicknesses and shapes. This not only consumes a significant amount of manpower and time, but also makes it difficult to fit tightly to irregular trunks, leading to leaks during the whitewashing process. Furthermore, the rigid encircling structure occupies a large amount of space during movement and storage, hindering transportation and storage, significantly limiting the efficiency and convenience of whitewashing operations.

[0003] At the same time, existing whitewashing devices operate independently from each other in the spraying and drying stages. After spraying, the whitewashing agent often relies on natural air drying, which is slow in environments with high humidity and low temperatures. Any whitewashing agent that hasn't dried in time tends to drip downward under the influence of gravity, resulting in wasted whitewashing agent and uneven whitewashing. Even in some devices equipped with a hot air drying function, the hot air channel and surrounding structure are separate, independent components, resulting in a complex equipment structure, high manufacturing costs, and low efficiency in the coordinated operation of the various components.

[0004] Therefore, how to design an embracing structure that can flexibly adapt to different tree trunk shapes, be easy to move and store, and realize simultaneous spraying and drying operations, promote the rapid drying of the whitewash agent and combine with the trunk surface, has become a key problem in the current development of forestry tree whitewashing technology. Summary of the Invention

[0005] In order to solve the problems that traditional tree whitewashing devices are difficult to adapt to the irregular shape of tree trunks, have uneven whitewashing, low efficiency, poor functional integration, and untimely drying after spraying resulting in whitewashing agent dripping and poor adhesion, the purpose of the present invention is to provide a mechanical tree whitewashing device for forestry and a method of use thereof.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a mechanical tree whitewashing device for forestry, comprising a cross-driving mechanism installed on a mobile trolley, a reciprocating rotating mechanism installed on the transmission end of the cross-driving mechanism, a cross-flow hot air blower installed on the transmission end of the reciprocating rotating mechanism, a flat nickel-titanium memory alloy tube installed on the air outlet end of the cross-flow hot air blower, a strip air outlet opened on the bottom of the flat nickel-titanium memory alloy tube away from the cross-flow hot air blower, and a plurality of evenly arranged adaptive spraying mechanisms installed on the side wall above the strip air outlet.

[0007] Preferably, the cross drive mechanism includes a hydraulic cylinder fixedly mounted on the mobile trolley, the hydraulic cylinder transmits in the horizontal direction, and its transmission end is fixedly connected to the first linear motor; the first linear motor transmits in the vertical direction, and its transmission end is fixedly connected to the hanging plate; the side wall of the hanging plate near the bottom is connected to the reciprocating rotating mechanism.

[0008] Preferably, the reciprocating rotating mechanism includes a U-shaped frame fixedly connected to the hanging plate, and the side walls of the U-shaped frame are slidably connected with the first arc rod, the second arc rod and the T-shaped rod; the outer wall of the second arc rod is fixedly connected with an arc rack, and the side wall of the T-shaped rod is provided with teeth that engage with the middle part of the arc rack, and the side wall of the U-shaped frame located between the arc rack and the teeth is provided with a strip through hole for the arc rack and the teeth to pass through; the inner wall of the U-shaped frame is fixedly installed with a motor, and the output end shaft of the motor is connected to a disc, and the end face of the disc is eccentrically fixedly connected to the drive shaft, and the bottom of the T-shaped rod is fixedly connected to a rectangular plate, and the side wall of the rectangular plate is vertically provided with a strip hole, and the outer wall of the drive shaft is slidably connected to the inner wall of the strip hole.

[0009] Preferably, the cross-flow hot air blower is fixedly mounted on the first arc-shaped rod and the second arc-shaped rod, and an electric heating wire is installed in the air inlet of the cross-flow hot air blower; the cross-flow hot air blower can turn on and off the heating of the electric heating wire;

[0010] The air outlet of the cross-flow hot air blower is vertically arranged and connected to the middle of one side of the flat nickel-titanium memory alloy tube; the two ends of the flat nickel-titanium memory alloy tube are respectively fixedly connected to an iron block and an electromagnet;

[0011] When the cross-flow hot air blower is turned on to heat the electric heating wire, the hot air heats the flat nickel-titanium memory alloy tube, and the flat nickel-titanium memory alloy tube undergoes a high-temperature phase change and bends into a ring shape;

[0012] When the cross-flow hot air blower is turned off and the heating wire is heated, the flat nickel-titanium memory alloy tube undergoes a low-temperature phase change and returns to a flat strip shape.

[0013] Preferably, the adaptive spraying mechanism includes two rectangular frames symmetrically fixedly installed on the side walls of a flat nickel-titanium memory alloy tube in the upper and lower directions, an arc-shaped spring piece is installed between the two rectangular frames, the end of the arc-shaped spring piece is vertical, and the outer wall of the end is slidably connected to the end of the rectangular frame and extends to the interior of the rectangular frame; one end of the arc-shaped spring piece located inside the rectangular frame is fixedly connected to a movable plate that is slidably connected to the inner wall of the rectangular frame, the inner wall of the rectangular frame is vertically fixedly connected to a fixed rod, and the outer wall of the fixed rod is provided with a spring that is tightly pressed against the inner wall of the rectangular frame and the movable plate; the middle part of the outer wall of the arc-shaped spring piece is fixedly connected to a connecting block, the side wall of the connecting block is fixedly connected to a notched spherical shell, and the inner wall of the notched spherical shell is rollingly inlaid with a sphere.

[0014] Preferably, the bottom of the connecting block is fixedly connected to a second linear motor that transmits in the vertical direction, the transmission end of the second linear motor is fixedly connected to a J-shaped plate, and the side wall of the bottom of the J-shaped plate is fixedly installed with an inclined skew nozzle.

[0015] Preferably, a bellows expansion tube is fixedly connected to the middle of the inner wall of the arc-shaped spring piece, and the end of the bellows expansion tube away from the arc-shaped spring piece is fixedly connected to the side wall of the flat nickel-titanium memory alloy tube. The outer wall of the bellows expansion tube close to one end of the flat nickel-titanium memory alloy tube is connected to a connecting tube for connecting to an adjacent bellows expansion tube, and one of the bellows expansion tubes is connected to an air pump for suction and inflation.

[0016] A method for using a mechanical tree whitewashing device for forestry includes the following steps:

[0017] Step 1: The cross drive mechanism moves the flat nickel-titanium memory alloy tube to the base of the tree;

[0018] Step 2: A cross-flow hot air blower sends hot air into the flat nickel-titanium memory alloy tube, and the flat nickel-titanium memory alloy tube is bent into a ring shape to embrace the tree;

[0019] Step 3: Several adaptive spraying mechanisms are synchronously pressed against the tree;

[0020] Step 4: Several adaptive spraying mechanisms simultaneously spray whitewash toward the trees, while a cross-driving mechanism pulls the flat nickel-titanium memory alloy tube upward, and a reciprocating rotating mechanism drives the annular flat nickel-titanium memory alloy tube to reciprocate.

[0021] Step 5: Hot air is blown from the strip-shaped air outlet toward the whitewash agent on the trees to dry the whitewash agent.

[0022] Compared with the prior art, the present invention achieves the following beneficial effects:

[0023] 1. The design of the adaptive spraying mechanism of the present invention can be adjusted in real time according to the curvature shape and orientation of the tree trunk, ensuring that the sphere always remains in a tight contact with the trunk, so that the whitewash agent evenly covers the surface of the trunk, thereby improving the quality of whitewashing.

[0024] 2. In the present invention, the flat nickel-titanium memory alloy tube is in a flat strip shape at room temperature, which is convenient for moving and storing the device. When hot air is introduced and heated to the phase change temperature, it quickly bends into a circular ring shape, which can tightly embrace the tree trunk. After the operation is completed, the heating is stopped and the alloy tube returns to a flat state under natural cooling.

[0025] 3. In the present invention, the flat nickel-titanium memory alloy tube not only serves as an embracing structure, but also serves as a hot air channel, thereby achieving simultaneous spraying and drying, promoting rapid bonding of the whitewashing agent with the trunk surface, and preventing the whitewashing agent from dripping downward.

[0026] 4. In the present invention, the reciprocating rotating mechanism drives the annular flat nickel-titanium memory alloy tube to rotate back and forth, thereby achieving uniform spraying of the entire height of the tree trunk and avoiding missing coating.

[0027] 5. The present invention can also cover the whitewashing of the roots of tree trunks. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the reciprocating rotating mechanism of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the reciprocating rotating mechanism connection of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the adaptive spraying mechanism of the present invention;

[0033] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of part A.

[0034] Figure: 1. Cross drive mechanism; 101. Hydraulic cylinder; 102. First linear motor; 103. Hanging plate; 2. Reciprocating rotation mechanism; 201. U-shaped frame; 202. First arc rod; 203. Second arc rod; 204. T-shaped rod; 205. Tooth; 206. Motor; 207. Disc; 208. Drive shaft; 209. Rectangular plate; 210. Strip hole; 211. Arc rack; 3. Crossflow hot air blower; 4. Flat nickel Titanium memory alloy tube; 401, strip air outlet; 402, iron block; 403, electromagnet; 5, adaptive spraying mechanism; 501, rectangular frame; 502, arc-shaped spring; 503, movable plate; 504, fixing rod; 505, spring; 506, connecting block; 507, notched spherical shell; 508, sphere; 509, second linear motor; 510, J-shaped plate; 511, skew nozzle; 512, corrugated telescopic tube; 513, connecting tube. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] See also Figures 1 to 5. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0037] This invention provides a technical solution: a mechanical tree whitewashing device for forestry use. This device utilizes a cross-drive mechanism 1 for spatial positioning. The device utilizes a reciprocating mechanism 2, a cross-flow hot air blower 3, a flat nickel-titanium shape memory alloy tube 4, and an adaptive spray mechanism 5 to achieve automated whitewashing and drying of trees. The following describes the various components and operating procedures in detail, using specific embodiments.

[0038] The cross-drive mechanism 1 is the basis for the entire device to achieve spatial movement. The hydraulic cylinder 101, which is fixedly installed on the mobile trolley, uses a double-acting hydraulic cylinder with adjustable stroke. Its telescopic distance in the horizontal direction can be accurately controlled by the hydraulic control system. The maximum stroke is set to 1.5 meters to meet the operational needs of trees with different spacings. The first linear motor 102 is vertically installed at the transmission end of the hydraulic cylinder 101. Its slide rail adopts a high-precision linear guide rail, and the slider is fixedly connected to the hanging plate 103 by bolts. The driving motor of the first linear motor 102 uses a servo motor, which can achieve precise displacement control at the level of 0.1mm, ensuring that the hanging plate 103 can be lifted and lowered smoothly in the vertical direction. The lifting range is 0-3 meters, which is suitable for the whitewashing of trees of different heights.

[0039] In the reciprocating rotating mechanism 2, the U-shaped frame 201 is made of high-strength aluminum alloy and is fixed to the side wall of the hanging plate 103 near the bottom by welding. The side wall of the U-shaped frame 201 is slidably connected with the first curved rod 202, the second curved rod 203, and the T-shaped rod 204. The first curved rod 202, the second curved rod 203, and the T-shaped rod 204 are all made of stainless steel to ensure smooth and stable sliding. The curved rack 211 is fixed to the outer wall of the second curved rod 203 via a key connection, and the teeth 205 are machined on the side wall of the T-shaped rod 204 by a milling process. Both have a module of 2 and a pressure angle of 20°, ensuring good meshing transmission.

[0040] The motor 206 is a stepper motor with a speed reducer having a reduction ratio of 1:10 and is connected to the central axis of the disc 207 via a coupling. The diameter of the disc 207 is 150 mm, and the drive shaft 208 is eccentrically mounted 50 mm from the center of the disc. The strip hole 210 on the rectangular plate 209 is 100 mm long and 1 mm wider than the outer diameter of the drive shaft 208 to ensure that the drive shaft 208 can slide flexibly within the strip hole 210. When the motor 206 is powered on, the disc 207 drives the drive shaft 208 to move in a circular trajectory. Under the restriction of the strip hole 210, the rectangular plate 209 and the T-bar 204 perform reciprocating linear motion in the horizontal direction, and then through the engagement of the teeth 205 with the arc rack 211, the second arc rod 203 drives the cross-flow hot air blower 3 and the flat nickel-titanium memory alloy tube 4 to achieve forward and reverse reciprocating rotation.

[0041] The housing of the crossflow hot air blower 3 is made of high-temperature-resistant engineering plastic and houses an adjustable heating wire with a power adjustment range of 500-2000W. The crossflow hot air blower 3 is bolted to the first and second curved rods 202, 203. A filter is installed at its air inlet to prevent debris from entering and affecting the operation of the hot air blower. The air outlet of the crossflow hot air blower 3 is sealed with a flange to the middle of one side of the flat nickel-titanium memory alloy tube 4, ensuring leak-free hot air transmission.

[0042] The thickness of the flat nickel-titanium memory alloy tube 4 is 2mm, the width is 50mm, and the length is customized according to actual needs, generally 2-3 meters. At both ends of the flat nickel-titanium memory alloy tube 4, an iron block 402 is welded at one end, and an on-off electromagnet 403 is installed at the other end. The suction force of the electromagnet 403 is greater than 100N, ensuring that the flat nickel-titanium memory alloy tube 4 can be firmly adsorbed when bent into a circular shape. When the cross-flow hot air blower 3 turns on the heating wire for heating and blows hot air at a temperature of 40-60°C into the interior of the flat nickel-titanium memory alloy tube 4, the flat nickel-titanium memory alloy tube 4 gradually bends into a circular shape due to the high-temperature phase change; when the whitewashing work is completed, the heating wire is turned off, and the flat nickel-titanium memory alloy tube 4 cools naturally at ambient temperature, and the low-temperature phase change returns to a flat strip, making it easy to transfer the device to the next tree.

[0043] In the adaptive spray mechanism 5, two rectangular frames 501 are symmetrically welded to the sidewalls of the flat nickel-titanium memory alloy tube 4. The internal dimensions of the rectangular frames 501 match those of the movable plate 503. A low-friction polytetrafluoroethylene gasket is used between the movable plate 503 and the inner wall of the rectangular frame 501 to reduce sliding resistance. A fixed rod 504 is threadedly fixed to the inner wall of the rectangular frame 501. A compression spring 505 is used with an elastic coefficient of 10 N / mm and a pre-compression of 10 mm, ensuring that the curved spring 502 provides stable elastic support for the notched spherical shell 507.

[0044] The notched spherical shell 507 has a notch angle of 120°, and the sphere 508 embedded inside has a diameter of 20mm. It is made of high-hardness ceramic and has a polished surface to reduce friction with the tree trunk. The connecting block 506 is fixed to the arc-shaped spring 502 by welding. The second linear motor 509 is installed at the bottom of the connecting block 506. Its stroke is 200mm and can drive the J-shaped plate 510 and the skewed nozzle 511 to move precisely in the vertical direction. The spray angle of the skewed nozzle 511 is 45°. By adjusting the flow control valve of the nozzle, the spray volume of the whitewash agent can be controlled between 50-200ml / min.

[0045] The bellows 512 is made of silicone, offering excellent flexibility and sealing properties. Its inner diameter is 10mm and its outer diameter is 15mm. A connecting tube 513, a flexible hose, connects the bellows 512 in sequence, with one end connected to an air pump. The pump's suction pressure is -0.05MPa, and the tension of the curved spring 502 is adjusted by controlling its start and stop.

[0046] Specific implementation of the device usage method:

[0047] Step 1: Positioning:

[0048] The operator drives the mobile cart and moves the device near the tree to be whitewashed. By pressing a button on the control panel, the cross-drive mechanism 1 is activated. Hydraulic cylinder 101 is first controlled to extend and retract horizontally, moving the flat NiTi memory alloy tube 4 to the base of the tree, maintaining a horizontal distance of 10-20 cm from the trunk. The first linear motor 102 then adjusts the height of the hanging plate 103, aligning the bottom of the flat NiTi memory alloy tube 4 with the base of the tree trunk.

[0049] Step 2: Hug the tree trunk:

[0050] On the control panel, activate crossflow hot air blower 3 and the heating wire heating function, setting the temperature to 50°C. Crossflow hot air blower 3 delivers hot air into the flat nickel-titanium memory alloy tube 4. After approximately 30 seconds, the flat nickel-titanium memory alloy tube 4 gradually bends into a ring shape due to the high-temperature phase transition. Once the flat nickel-titanium memory alloy tube 4 is bent into place, electromagnet 403 is energized, causing it to attach to iron block 402, completing the encircling and securing of the tree trunk.

[0051] Step 3: Tighten the spraying mechanism:

[0052] An air pump is used to release pressure from the bellows 512. The curved spring piece 502 returns to its original shape, the bellows 512 stretches, and the center of the curved spring piece 502 moves away from the flat nickel-titanium memory alloy tube 4, allowing the spheres 508 of the adaptive spray mechanism 5 to simultaneously press against the tree. By monitoring the feedback from the pressure sensors on the device, the contact pressure between each sphere 508 and the tree trunk is maintained at 1-2N.

[0053] Step 4: Spraying and moving:

[0054] Turn on the whitening agent delivery pump and deliver the whitening agent to each skew nozzle 511 through the pipeline. Start the second linear motor 509, drive the skew nozzle 511 down to the root of the trunk, set the spray flow rate of the nozzle to 100ml / min, and start spraying the root trunk. During the spraying process, the second linear motor 509 lifts the skew nozzle 511 upward at a speed of 5mm / s. When the skew nozzle 511 is close to the sphere 508, start the cross drive mechanism 1, and pull the annular flat nickel-titanium memory alloy tube 4 upward at a speed of 10mm / s; at the same time, start the reciprocating rotation mechanism 2, and the motor 206 runs at a speed of 10 rpm to drive the annular flat nickel-titanium memory alloy tube 4 to rotate back and forth, so as to achieve uniform spraying of the full height of the trunk.

[0055] Step 5: Drying:

[0056] During the spraying process, cross-flow hot air blower 3 operates continuously, blowing hot air from strip-shaped air outlet 401 toward the whitewash on the tree. The hot air is maintained at a temperature of 40-50°C and a speed of 5-8 m / s, accelerating the drying process of the whitewash. When the whitewashing of a tree is complete, the heating wire is turned off, the air pump and whitewash delivery pump are stopped, and electromagnet 403 is de-energized. The flat nickel-titanium memory alloy tube 4 returns to its flat strip shape due to natural cooling. The operator then drives the mobile cart to the next tree and repeats the above process.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A mechanical tree whitewashing device for forestry, comprising a cross drive mechanism (1) mounted on a mobile trolley, characterized in that: A reciprocating rotating mechanism (2) is installed on the transmission end of the cross-driving mechanism (1), a cross-flow hot air blower (3) is installed on the reciprocating rotating mechanism (2), a flat nickel-titanium memory alloy tube (4) is installed on the air outlet end of the cross-flow hot air blower (3), a strip-shaped air outlet (401) is provided on the bottom of the flat nickel-titanium memory alloy tube (4) on the side away from the cross-flow hot air blower (3), and a plurality of evenly arranged adaptive spraying mechanisms (5) are installed on the side wall thereof located above the strip-shaped air outlet (401); The cross drive mechanism (1) includes a hydraulic cylinder (101) fixedly mounted on a mobile trolley, wherein the hydraulic cylinder (101) performs transmission in a horizontal direction, and a first linear motor (102) is fixedly connected to a transmission end thereof; the first linear motor (102) performs transmission in a vertical direction, and a hanging plate (103) is fixedly connected to a transmission end thereof; a side wall of the hanging plate (103) close to the bottom is connected to the reciprocating rotating mechanism (2); The reciprocating rotating mechanism (2) comprises a U-shaped frame (201) fixedly connected to the hanging plate (103); a first arc-shaped rod (202), a second arc-shaped rod (203) and a T-shaped rod (204) are slidably connected to the side wall of the U-shaped frame (201); an arc-shaped rack (211) is fixedly connected to the outer wall of the second arc-shaped rod (203); a tooth (205) meshing with the middle part of the arc-shaped rack (211) is provided on the side wall of the T-shaped rod (204); and a tooth (205) is provided on the side wall of the U-shaped frame (201) between the arc-shaped rack (211) and the tooth (205). There is a strip-shaped through hole for the arc-shaped rack (211) and the teeth (205) to pass through; the inner wall of the U-shaped frame (201) is fixedly mounted with a motor (206), the output end shaft of the motor (206) is connected to a disk (207), the end face of the disk (207) is eccentrically fixedly connected to a drive shaft (208), the bottom of the T-shaped rod (204) is fixedly connected to a rectangular plate (209), the side wall of the rectangular plate (209) is vertically opened with a strip-shaped hole (210), and the outer wall of the drive shaft (208) is slidably connected to the inner wall of the strip-shaped hole (210); The cross-flow hot air blower (3) is fixedly mounted on the first arc-shaped rod (202) and the second arc-shaped rod (203); The flat nickel-titanium memory alloy tube (4) undergoes a high-temperature phase change and bends into a circular ring; and the flat nickel-titanium memory alloy tube (4) undergoes a low-temperature phase change and returns to a flat strip shape.

2. A mechanical tree whitewashing device for forestry according to claim 1, characterized in that: An electric heating wire is installed in the air inlet of the cross-flow hot air blower (3); the cross-flow hot air blower (3) can turn on and off the heating of the electric heating wire; The air outlet of the cross-flow hot air blower (3) is vertically arranged, and the air outlet is connected to the middle of one side of the flat nickel-titanium memory alloy tube (4); the two ends of the flat nickel-titanium memory alloy tube (4) are respectively fixedly connected to an iron block (402) and an electromagnet (403); When the cross-flow hot air blower (3) is turned on to heat the electric heating wire, the hot air heats the flat nickel-titanium memory alloy tube (4), and the flat nickel-titanium memory alloy tube (4) undergoes a high-temperature phase change and bends into a circular ring shape; When the cross-flow hot air blower (3) is turned off to heat the electric heating wire, the flat nickel-titanium memory alloy tube (4) undergoes a low-temperature phase change and returns to a flat strip shape.

3. The mechanical tree whitewashing device for forestry according to claim 1, characterized in that: The adaptive spraying mechanism (5) comprises two rectangular frames (501) symmetrically fixedly mounted on the side wall of a flat nickel-titanium memory alloy tube (4) in an upper and lower direction, an arc-shaped spring piece (502) is mounted between the two rectangular frames (501), the end of the arc-shaped spring piece (502) is vertical, and the outer wall of the end is slidably connected to the end of the rectangular frame (501) and extends to the interior of the rectangular frame (501); one end of the arc-shaped spring piece (502) located inside the rectangular frame (501) is fixedly connected to the rectangular frame (501) The inner wall is a movable plate (503) connected in a sliding manner, the inner wall of the rectangular frame (501) is vertically fixedly connected to a fixed rod (504), and the outer wall of the fixed rod (504) is provided with a spring (505) pressed against the inner wall of the rectangular frame (501) and the movable plate (503); the middle part of the outer wall of the arc-shaped spring piece (502) is fixedly connected to a connecting block (506), the side wall of the connecting block (506) is fixedly connected to a notched spherical shell (507), and the inner wall of the notched spherical shell (507) is rollingly inlaid with a sphere (508).

4. The mechanical tree whitewashing device for forestry according to claim 3, characterized in that: A second linear motor (509) for transmission in the vertical direction is fixedly connected to the bottom of the connecting block (506); a transmission end of the second linear motor (509) is fixedly connected to a J-shaped plate (510); and a tilted deflection nozzle (511) is fixedly mounted on the side wall of the bottom of the J-shaped plate (510).

5. The mechanical tree whitewashing device for forestry according to claim 3, characterized in that: A bellows expansion tube (512) is fixedly connected to the middle of the inner wall of the arc-shaped spring piece (502), and one end of the bellows expansion tube (512) away from the arc-shaped spring piece (502) is fixedly connected to the side wall of the flat nickel-titanium memory alloy tube (4). The outer wall of the bellows expansion tube (512) close to one end of the flat nickel-titanium memory alloy tube (4) is connected to a connecting tube (513) for connecting to an adjacent bellows expansion tube (512), and one of the bellows expansion tubes (512) is connected to an air pump for suction and inflation.

6. A method for using a mechanical tree whitewashing device for forestry, characterized in that: The mechanical tree whitewashing device for forestry according to any one of claims 1 to 5 comprises the following steps: Step 1: The cross drive mechanism (1) moves the flat nickel-titanium memory alloy tube (4) to the bottom of the tree; Step 2: The cross-flow hot air blower (3) sends hot air into the interior of the flat nickel-titanium memory alloy tube (4), and the flat nickel-titanium memory alloy tube (4) is bent into a ring shape to embrace the tree; Step 3: a plurality of adaptive spraying mechanisms (5) are synchronously pressed against a circle around the tree; Step 4: a plurality of adaptive spraying mechanisms (5) spray the whitening agent toward the trees synchronously, while the cross driving mechanism (1) pulls the flat nickel-titanium memory alloy tube (4) upward, and the reciprocating rotating mechanism (2) drives the annular flat nickel-titanium memory alloy tube (4) to reciprocate; Step 5: Hot air is blown from the strip-shaped air outlet (401) toward the whitewashing agent on the trees to dry the whitewashing agent.

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