Mechanical tree whitewashing device for forestry and use method of mechanical tree whitewashing device

Abstract

The invention discloses a forestry mechanical tree whitewashing device and a using method thereof.The forestry mechanical tree whitewashing device comprises a cross-shaped driving mechanism installed on a moving trolley, a reciprocating rotating mechanism is installed at the transmission end of the cross-shaped driving mechanism, and a transverse flow air heater is installed on the reciprocating rotating mechanism in a transmission mode; a flat nickel-titanium memory alloy pipe is installed at the air outlet end of the transverse flow hot-air blower, a strip-shaped air outlet is formed in the bottom of the side, away from the transverse flow hot-air blower, of the flat nickel-titanium memory alloy pipe, and a plurality of self-adaptive spraying mechanisms which are evenly arranged are installed on the side wall, located above the strip-shaped air outlet, of the flat nickel-titanium memory alloy pipe. The tree whitewashing device solves the problems that a traditional tree whitewashing device is difficult to adapt to the irregular shape of a tree trunk, whitewashing is uneven, efficiency is low, the function integration degree is poor, and the whitewashing agent drips and is poor in adhesion effect due to the fact that drying is not timely after spraying.

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 installed on the moving trolley. The hydraulic cylinder drives in the horizontal direction, and its driving end is fixedly connected to a first linear motor. The first linear motor drives in the vertical direction, and its driving end is fixedly connected to a hanging plate. The side wall of the hanging plate near the bottom is connected to the reciprocating rotation mechanism.

[0008] Preferably, the reciprocating rotation mechanism includes a U-shaped frame fixedly connected to the hanging plate. The side walls of the U-shaped frame are slidably penetrated by a first arc-shaped rod, a second arc-shaped rod, and a T-shaped rod. The outer wall of the second arc-shaped rod is fixedly connected with an arc-shaped rack. Teeth meshing with the middle of the arc-shaped rack are provided on the side wall of the T-shaped rod. A strip-shaped through hole is provided on the side wall of the U-shaped frame between the arc-shaped rack and the teeth for the arc-shaped rack and the teeth to pass through. A motor is fixedly installed on the inner wall of the U-shaped frame. The output end of the motor is axially connected with a disc. A driving shaft is eccentrically fixedly connected to the end face of the disc. The bottom of the T-shaped rod is fixedly connected with a rectangular plate. A strip-shaped hole is vertically provided on the side wall of the rectangular plate. The outer wall of the driving shaft is slidably connected with the inner wall of the strip-shaped hole.

[0009] Preferably, the cross-flow hot air blower is fixedly installed on the first arc-shaped rod and the second arc-shaped rod. 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. The air outlet of the cross-flow hot air blower is vertically arranged, and its air outlet communicates with the middle part of one side of the flat-shaped nickel-titanium memory alloy tube. Iron blocks and electromagnets are respectively fixedly connected to both ends of the flat-shaped nickel-titanium memory alloy tube. When the cross-flow hot air blower turns on the heating of the electric heating wire and the hot air heats the flat-shaped nickel-titanium memory alloy tube, the flat-shaped nickel-titanium memory alloy tube undergoes a high-temperature phase change and bends into a circular ring. When the cross-flow hot air blower turns off the heating of the electric heating wire, the flat-shaped nickel-titanium memory alloy tube undergoes a low-temperature phase change and returns to a flat strip shape.

[0010] Preferably, the adaptive spraying mechanism includes two rectangular frames symmetrically and fixedly installed on the side wall of the flat-shaped nickel-titanium memory alloy tube up and down. An arc-shaped elastic sheet is installed between the two rectangular frames. The end of the arc-shaped elastic sheet is vertical, and the outer wall of the end is slidably penetrated through the end of the rectangular frame and extends into the interior of the rectangular frame. One end of the arc-shaped elastic sheet located inside the rectangular frame is fixedly connected with a movable plate slidably connected to the inner wall of the rectangular frame. A fixed rod is vertically fixedly connected to the inner wall of the rectangular frame. A spring that abuts against the inner wall of the rectangular frame and the movable plate is sleeved on the outer wall of the fixed rod. A connecting block is fixedly connected to the middle of the outer wall of the arc-shaped elastic sheet. A notch spherical shell is fixedly connected to the side wall of the connecting block. A sphere is rollingly embedded in the inner wall of the notch spherical shell.

[0011] Preferably, the bottom of the connecting block is fixedly connected with a second linear motor that drives in the vertical direction. The driving end of the second linear motor is fixedly connected with a J-shaped plate. An inclined offset nozzle is fixedly installed on the side wall of the bottom of the J-shaped plate.

[0012] Preferably, a corrugated expansion tube is fixedly connected to the middle of the inner wall of the arc-shaped elastic piece. One end of the corrugated expansion tube away from the arc-shaped elastic piece is fixedly connected to the side wall of the flat-shaped nickel-titanium memory alloy tube. A connecting tube is communicated with the outer wall of one end of the corrugated expansion tube close to the flat-shaped nickel-titanium memory alloy tube for communicating with an adjacent corrugated expansion tube. An air pump is communicated with one of the corrugated expansion tubes for inhaling and inflating.

[0013] A method for using a mechanical tree whitening device for forestry includes the following steps: Step 1, the cross drive mechanism moves the flat-shaped nickel-titanium memory alloy tube to the side of the bottom of the tree; Step 2, the cross-flow hot air blower sends hot air into the flat-shaped nickel-titanium memory alloy tube, and the flat-shaped nickel-titanium memory alloy tube bends into a circular ring to surround the tree; Step 3, a plurality of adaptive spraying mechanisms are synchronously pressed against the circumference of the tree; Step 4, a plurality of adaptive spraying mechanisms synchronously spray the whitening agent towards the tree. At the same time, the cross drive mechanism lifts the flat-shaped nickel-titanium memory alloy tube upwards, and the reciprocating rotation mechanism drives the circular flat-shaped nickel-titanium memory alloy tube to rotate reciprocally; Step 5, hot air blows from the strip-shaped air outlet towards the whitening agent on the tree to dry the whitening agent.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. In the present invention, the design of the adaptive spraying mechanism can be adjusted in real time according to the bending shape and orientation of the tree trunk, ensuring that the sphere is always pressed against the tree trunk, so that the whitening agent evenly covers the surface of the tree trunk and improves the whitening quality.

[0015] 2. In the present invention, the flat-shaped nickel-titanium memory alloy tube is in a flat strip shape at normal temperature, which is convenient for the movement and storage of the device. When heated to the phase change temperature by hot air, it quickly bends into a circular ring and can tightly surround the tree trunk; after the operation is completed, heating is stopped, and the alloy tube returns to the flat state under natural cooling.

[0016] 3. In the present invention, the flat-shaped nickel-titanium memory alloy tube not only serves as a surrounding structure but also serves as a hot air channel, realizing the simultaneous spraying and drying, promoting the rapid combination of the whitening agent and the surface of the tree trunk, and avoiding the dripping of the whitening agent.

[0017] 4. In the present invention, the reciprocating rotation mechanism drives the circular flat-shaped nickel-titanium memory alloy tube to rotate reciprocally, realizing the uniform spraying of the entire height of the tree trunk and avoiding missed spraying.

[0018] 5. In the present invention, the whitening of the tree trunk root can also be covered. Description of the Drawings

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figure 1 It is a schematic structural diagram of the whole of the present invention; Figure 2 It is a schematic structural diagram of the reciprocating rotating mechanism of the present invention; Figure 3 It is a schematic structural diagram of the connection of the reciprocating rotating mechanism of the present invention; Figure 4 It is a schematic structural diagram of the adaptive spraying mechanism of the present invention; Figure 5 For the present invention Figure 4 It is a schematic structural diagram of part A in the present invention.

[0020] In the figure: 1. Cross drive mechanism; 101. Hydraulic cylinder; 102. First linear motor; 103. Suspension plate; 2. Reciprocating rotating mechanism; 201. U-shaped frame; 202. First arc-shaped rod; 203. Second arc-shaped rod; 204. T-shaped rod; 205. Teeth; 206. Motor; 207. Disc; 208. Drive shaft; 209. Rectangular plate; 210. Strip-shaped hole; 211. Arc-shaped rack; 3. Cross-flow hot air blower; 4. Flat-shaped nickel-titanium memory alloy tube; 401. Strip-shaped air outlet; 402. Iron block; 403. Electromagnet; 5. Adaptive spraying mechanism; 501. Rectangular frame; 502. Arc-shaped elastic piece; 503. Movable plate; 504. Fixed rod; 505. Spring; 506. Connecting block; 507. Notched spherical shell; 508. Sphere; 509. Second linear motor; 510. J-shaped plate; 511. Eccentric nozzle; 512. Corrugated expansion pipe; 513. Connecting pipe. Specific embodiments

[0021] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] Please refer to Figures 1 to 5 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0023] The present invention provides a technical solution: a mechanical tree whitening device for forestry. Through the cross drive mechanism 1 for spatial positioning, and by the collaborative work of the reciprocating rotation mechanism 2, the cross-flow hot air blower 3, the flat-shaped nickel-titanium memory alloy tube 4, and the adaptive spraying mechanism 5, the automatic whitening and drying of trees are completed. The following will describe the structures and working processes of each part in detail with specific embodiments.

[0024] The cross drive mechanism 1 is the basis for the entire device to achieve spatial movement. The hydraulic cylinder 101 fixedly installed on the mobile trolley is a double-acting hydraulic cylinder with adjustable stroke. Through the hydraulic control system, its telescopic distance in the horizontal direction can be precisely controlled, and the maximum stroke is set to 1.5 meters to meet the operation requirements of trees with different spacings. The first linear motor 102 is vertically installed at the driving end of the hydraulic cylinder 101. Its slide rail uses 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 is a servo motor, which can achieve precise displacement control at the 0.1 mm level, ensuring the stable lifting and lowering of the hanging plate 103 in the vertical direction, and the lifting range is 0 - 3 meters to adapt to the whitening work of trees at different heights.

[0025] In the reciprocating rotation mechanism 2, the U-shaped frame 201 is made of high-strength aluminum alloy and is fixed to the side wall near the bottom of the hanging plate 103 by welding. The side walls of the U-shaped frame 201 are slidably penetrated by the first arc-shaped rod 202, the second arc-shaped rod 203, and the T-shaped rod 204. The first arc-shaped rod 202, the second arc-shaped rod 203, and the T-shaped rod 204 are all made of stainless steel to ensure smooth and stable sliding. The arc-shaped rack 211 is fixedly connected to the outer wall of the second arc-shaped rod 203 by key connection, and the teeth 205 are machined on the side wall of the T-shaped rod 204 by milling. The module of both is 2, and the pressure angle is 20°, ensuring good meshing transmission.

[0026] The motor 206 is a stepper motor with a reducer, and the reduction ratio is 1:10. It is connected to the central axis of the disc 207 through a coupling. The diameter of the disc 207 is 150 mm, and the drive shaft 208 is eccentrically installed 50 mm away from the center of the disc. The length of the strip hole 210 on the rectangular plate 209 is 100 mm, and the width is 1 mm larger than the outer diameter of the drive shaft 208 to ensure the flexible sliding of the drive shaft 208 in the strip hole 210. When the motor 206 is powered on and running, 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-shaped rod 204 make reciprocating linear motions in the horizontal direction. Then, through the meshing of the teeth 205 and the arc-shaped rack 211, the second arc-shaped rod 203 drives the cross-flow hot air blower 3 and the flat-shaped nickel-titanium memory alloy tube 4 to achieve forward and reverse reciprocating rotation.

[0027] The housing of the cross-flow hot air blower 3 is made of high-temperature resistant engineering plastic, and an adjustable electric heating wire is installed inside. The power adjustment range of the electric heating wire is 500 - 2000W. The cross-flow hot air blower 3 is fixed on the first arc-shaped rod 202 and the second arc-shaped rod 203 by bolts. A filter screen is installed at its air inlet to prevent sundries from entering and affecting the normal operation of the hot air blower. The air outlet of the cross-flow hot air blower 3 is hermetically connected to the middle of one side of the flat-shaped nickel-titanium memory alloy tube 4 through a flange to ensure no leakage during the hot air transmission process.

[0028] The thickness of the flat-shaped 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-shaped 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 to ensure that the flat-shaped nickel-titanium memory alloy tube 4 can be firmly adsorbed when bent into a circular ring. When the cross-flow hot air blower 3 turns on the electric heating wire for heating and blows hot air at a temperature of 40 - 60°C into the interior of the flat-shaped nickel-titanium memory alloy tube 4, the flat-shaped nickel-titanium memory alloy tube 4 gradually bends into a circular ring due to high-temperature phase change; when the whitewashing work is completed, the electric heating wire is turned off, and the flat-shaped nickel-titanium memory alloy tube 4 naturally cools at ambient temperature, and the low-temperature phase change restores it to a flat strip shape, facilitating the transfer of the device to the next tree.

[0029] In the adaptive spraying mechanism 5, two rectangular frames 501 are symmetrically fixed on the side wall of the flat-shaped nickel-titanium memory alloy tube 4 in an up-and-down manner by welding. The internal dimensions of the rectangular frame 501 are adapted to the movable plate 503. A polytetrafluoroethylene gasket with a low coefficient of friction is used between the movable plate 503 and the inner wall of the rectangular frame 501 to reduce the sliding resistance. The fixed rod 504 is fixed to the inner wall of the rectangular frame 501 by threaded connection. The spring 505 is a compression spring with an elastic coefficient of 10N / mm and a pre-compression amount of 10mm to ensure that the arc-shaped elastic piece 502 provides stable elastic support for the notched spherical shell 507.

[0030] The notch angle of the notched spherical shell 507 is 120°. The diameter of the sphere 508 embedded inside is 20mm, which is made of high-hardness ceramic material and its surface is polished to reduce the frictional resistance with the tree trunk. The connecting block 506 and the arc-shaped elastic piece 502 are fixed by welding. The second linear motor 509 is installed at the bottom of the connecting block 506, and its stroke is 200mm, which can drive the J-shaped plate 510 and the offset nozzle 511 to move precisely in the vertical direction. The spraying angle of the offset nozzle 511 is 45°. By adjusting the flow control valve of the nozzle, the spraying amount of the whitewashing agent can be controlled between 50 - 200ml / min.

[0031] The corrugated expansion pipe 512 is made of silicone material, with good flexibility and sealing performance. Its inner diameter is 10 mm and its outer diameter is 15 mm. The connecting pipe 513 is a flexible pipe that sequentially connects each corrugated expansion pipe 512, with one end connected to the air pump. The air extraction pressure of the air pump is -0.05 MPa. By controlling the start and stop of the air pump, the tension of the arc-shaped elastic piece 502 is adjusted.

[0032] Specific implementation of the device usage method: Step 1, positioning: The operator drives the mobile trolley to move the device near the tree to be whitewashed. By operating the buttons on the control panel, the cross drive mechanism 1 is started. First, control the hydraulic cylinder 101 to expand and contract horizontally, so that the flat nickel-titanium memory alloy tube 4 moves to the side of the bottom of the tree, and the horizontal distance from the tree trunk is maintained at 10 - 20 cm; then adjust the height of the hanging plate 103 through the first linear motor 102 so that the bottom of the flat nickel-titanium memory alloy tube 4 is aligned with the root of the tree trunk.

[0033] Step 2, surrounding the tree trunk: Start the cross-flow hot air blower 3 on the control panel and turn on the electric heating wire heating function, and set the temperature to 50 °C. The cross-flow hot air blower 3 sends hot air into the flat nickel-titanium memory alloy tube 4. After about 30 seconds, the flat nickel-titanium memory alloy tube 4 gradually bends into a circular ring due to high-temperature phase change. When the flat nickel-titanium memory alloy tube 4 bends in place, energize the electromagnet 403 to make it adsorb with the iron block 402 to complete the surrounding and fixing of the tree trunk.

[0034] Step 3, the spraying mechanism is tightened: Release the pressure inside the corrugated expansion pipe 512 through the air pump. The arc-shaped elastic piece 502 returns to its arc shape, the corrugated expansion pipe 512 elongates, and the middle part of the arc-shaped elastic piece 502 moves away from the flat nickel-titanium memory alloy tube 4, so that the spheres 508 of several adaptive spraying mechanisms 5 are synchronously tightened around the tree. By observing the data feedback by the pressure sensor on the device, ensure that the contact pressure between each sphere 508 and the tree trunk is maintained at 1 - 2 N.

[0035] Step 4, spraying and moving: Turn on the whitening agent delivery pump and deliver the whitening agent to each offset nozzle 511 through the pipeline. Start the second linear motor 509 to drive the offset nozzle 511 to descend to the root of the tree trunk. Set the spraying flow rate of the nozzle to 100 ml / min and start spraying the root tree trunk. During the spraying process, the second linear motor 509 lifts the offset nozzle 511 upward at a speed of 5 mm / s. When the offset nozzle 511 approaches the sphere 508, start the cross drive mechanism 1 and lift the circular flat nickel-titanium memory alloy tube 4 upward at a speed of 10 mm / s; at the same time, start the reciprocating rotation mechanism 2, and the motor 206 operates at a speed of 10 revolutions per minute to drive the circular flat nickel-titanium memory alloy tube 4 to rotate reciprocally, realizing uniform spraying of the entire height of the tree trunk.

[0036] Step Five, Drying: During the spraying process, the cross-flow hot air blower 3 keeps working and blows hot air from the strip-shaped air outlet 401 onto the whitening agent on the tree. The temperature of the hot air is maintained at 40 - 50 °C and the wind speed is 5 - 8 m / s to accelerate the drying process of the whitening agent. When the whitening work of a tree is completed, turn off the heating wire, stop the air pump and the whitening agent delivery pump, cut off the power supply of the electromagnet 403, and the flat nickel-titanium memory alloy tube 4 returns to the flat strip shape under natural cooling. The operator drives the mobile trolley to the next tree and repeats the above operations.

[0037] The above embodiments merely illustrate the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A mechanical tree whitening device for forestry, comprising a cross drive mechanism (1) installed on a mobile trolley, characterized in that: A reciprocating rotary mechanism (2) is installed on the transmission end of the cross drive mechanism (1). A cross-flow hot air blower (3) is drivingly installed on the reciprocating rotary mechanism (2). A flat nickel-titanium memory alloy tube (4) is installed at the air outlet end of the cross-flow hot air blower (3). A strip-shaped air outlet (401) is formed at 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 number of adaptive spraying mechanisms (5) are evenly arranged on the side wall of the flat nickel-titanium memory alloy tube (4) above the strip-shaped air outlet (401).

2. The mechanical tree whitening device for forestry according to claim 1, characterized in that: The cross drive mechanism (1) includes a hydraulic cylinder (101) fixedly installed on the mobile trolley. The hydraulic cylinder (101) is driven in the horizontal direction, and its drive end is fixedly connected to a first linear motor (102). The first linear motor (102) is driven in the vertical direction, and its drive end is fixedly connected to a hanging plate (103). The side wall of the hanging plate (103) near the bottom is connected to the reciprocating rotary mechanism (2).

3. The mechanical tree whitening device for forestry according to claim 2, characterized in that: The reciprocating rotary mechanism (2) includes 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 inserted through 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). Teeth (205) meshing with the middle of the arc-shaped rack (211) are formed on the side wall of the T-shaped rod (204). A strip-shaped through hole is formed in the side wall of the U-shaped frame (201) between the arc-shaped rack (211) and the teeth (205) for the arc-shaped rack (211) and the teeth (205) to pass through. A motor (206) is fixedly installed on the inner wall of the U-shaped frame (201). The output end of the motor (206) is axially connected to a disc (207). A drive shaft (208) is eccentrically fixedly connected to the end face of the disc (207). A rectangular plate (209) is fixedly connected to the bottom of the T-shaped rod (204). A strip-shaped hole (210) is vertically formed in the side wall of the rectangular plate (209). The outer wall of the drive shaft (208) is slidably connected to the inner wall of the strip-shaped hole (210).

4. The mechanical tree whitening device for forestry according to claim 3, characterized in that: The cross-flow hot air blower (3) is fixedly installed on the first arc-shaped rod (202) and the second arc-shaped rod (203). A 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 heating wire. The air outlet of the cross-flow hot air blower (3) is vertically arranged, and its air outlet communicates with the middle of one side of the flat nickel-titanium memory alloy tube (4). Iron blocks (402) and electromagnets (403) are respectively fixedly connected to both ends of the flat nickel-titanium memory alloy tube (4). When the cross-flow hot air blower (3) turns on the heating of the heating wire and the hot air heats the flat nickel-titanium memory alloy tube (4), 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) turns off the heating of the heating wire, the flat nickel-titanium memory alloy tube (4) undergoes a low-temperature phase change and returns to a flat strip shape.

5. A mechanical tree whitewashing device for forestry according to claim 1, characterized in that: The adaptive spraying mechanism (5) includes two rectangular frames (501) symmetrically and fixedly installed on the side walls of the flat nickel-titanium shape memory alloy tube (4) in the up-and-down direction. An arc-shaped elastic sheet (502) is installed between the two rectangular frames (501). The end of the arc-shaped elastic sheet (502) is vertical, and the outer wall of the end slides through the end of the rectangular frame (501) and extends into the interior of the rectangular frame (501). One end of the arc-shaped elastic sheet (502) located inside the rectangular frame (501) is fixedly connected with a movable plate (503) that is slidably connected to the inner wall of the rectangular frame (501). A fixed rod (504) is vertically and fixedly connected to the inner wall of the rectangular frame (501). A spring (505) that abuts against the inner wall of the rectangular frame (501) and the movable plate (503) is sleeved on the outer wall of the fixed rod (504). A connecting block (506) is fixedly connected to the middle of the outer wall of the arc-shaped elastic sheet (502). A notch spherical shell (507) is fixedly connected to the side wall of the connecting block (506). A sphere (508) is rollingly embedded in the inner wall of the notch spherical shell (507).

6. The mechanical tree whitening device for forestry according to claim 5, characterized in that: A second linear motor (509) for vertical transmission is fixedly connected to the bottom of the connecting block (506). A J-shaped plate (510) is fixedly connected to the transmission end of the second linear motor (509). An inclined offset nozzle (511) is fixedly installed on the side wall of the bottom of the J-shaped plate (510).

7. A mechanical tree whitewashing device for forestry according to claim 5, characterized in that: A corrugated expansion pipe (512) is fixedly connected to the middle of the inner wall of the arc-shaped elastic sheet (502). One end of the corrugated expansion pipe (512) away from the arc-shaped elastic sheet (502) is fixedly connected to the side wall of the flat nickel-titanium shape memory alloy tube (4). A connecting pipe (513) is communicated with the outer wall of the end of the corrugated expansion pipe (512) close to the flat nickel-titanium shape memory alloy tube (4) for communicating with an adjacent corrugated expansion pipe (512). One of the corrugated expansion pipes (512) is communicated with an air pump for sucking and pumping air.

8. A method for using a mechanical tree whitening device for forestry, characterized in that, Using the mechanical tree whitening device for forestry according to any one of claims 1-7, includes the following steps: Step 1, the cross driving mechanism (1) moves the flat nickel-titanium shape memory alloy tube (4) to the side of 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 shape memory alloy tube (4), and the flat nickel-titanium shape memory alloy tube (4) bends into a circular ring to surround the tree; Step 3, several adaptive spraying mechanisms (5) synchronously abut against one week of the tree; Step 4, several adaptive spraying mechanisms (5) synchronously spray the whitening agent towards the tree. At the same time, the cross driving mechanism (1) pulls up the flat nickel-titanium shape memory alloy tube (4), and the reciprocating rotation mechanism (2) drives the circular flat nickel-titanium shape memory alloy tube (4) to rotate reciprocally; Step 5, hot air blows from the strip-shaped air outlet (401) towards the whitening agent on the tree to dry the whitening agent.

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