Speed-regulating variable-frequency ultrasonic quincunx picking and beating machine

Abstract

The present application relates to a kind of speed-regulating variable frequency ultrasonic plum picking and beating machine, including beating ware, transmission mechanism, power transmission and picking and beating pole, handle, control system, frequency conversion system, direct-current brushless reduction motor, can be carried lithium battery, the inner wall of beating ware is equipped with ultrasonic generator and ultrasonic enhancement plate;Lithium battery power supply makes direct-current brushless reduction motor drive power transmission mechanism to carry out rotary motion, power transmission drives rotating eccentric mechanism to realize reciprocating motion again, so that beating ware reciprocates left and right, carries out beating branch, and produces vibration to branch, so as to pick and beat whole plum, also can use the cavitation and vibration effect of high frequency ultrasonic wave to promote plum high frequency vibration and fall off, picking and beating arm is close to merge when beating and avoid damaging ultrasonic generator and ultrasonic enhancement plate, while avoiding damaging branch;With simple structure, easy operation, long-lasting, safe and reliable, high work efficiency and the like, promote plum industry to intelligent direction.

Description

Technical Field

[0001] This invention belongs to the category of agricultural machinery and equipment, specifically relating to a speed-regulating frequency-converting ultrasonic plum blossom harvester. Background Technology

[0002] Plum blossom is a unique flowering plant native to my country. It is considered the foremost of the ten most famous flowers in China, and along with orchids, bamboo, and chrysanthemums, it is known as one of the "Four Gentlemen." my country has a vast area dedicated to plum blossom cultivation and a large number of plum trees. As a unique traditional flower, plum blossom has high value; it can be used to make medicine, cosmetics, and tea. Regularly brewing plum blossom tea can invigorate the spleen and stomach, clear and protect the liver, and promote blood circulation. Furthermore, the anthocyanins in plum blossom can inhibit melanin formation, reducing the appearance of dark spots and freckles, thus having a whitening effect. Plum blossom also contains abundant vitamin C and vitamin E, which can promote skin cell renewal, improve skin elasticity, delay skin aging, and make the skin smoother and more delicate, exhibiting significant beauty benefits. Therefore, in recent years, plum blossom has become increasingly popular among young people.

[0003] However, traditional methods of picking plum blossoms primarily involve manual labor, where people climb trees and pluck the blossoms one by one by hand. This is extremely dangerous, prone to falls and other accidents. Furthermore, the limited strength at height makes it difficult to harvest the blossoms, and this method is labor-intensive, incomplete, and inefficient. While some methods use sticks to knock the blossoms down from the trees to prevent climbing and avoid potential safety hazards, this easily damages branches and breaks off blossoms, resulting in poor-quality flowers, hindering tree growth, and reducing the following year's plum blossom yield.

[0004] Although there have been designs for speed-adjustable and frequency-controlled plum blossom harvesting machines in recent years, these are mainly large-scale machines suitable for harvesting plum blossoms in plains areas, but not for harvesting plum blossoms growing on steep mountain slopes with an incline of more than 25 degrees.

[0005] Therefore, it is necessary to provide a variable frequency speed-controlled plum blossom harvester that is portable, easy to operate, safe and reliable, highly efficient, does not damage branches and buds, and has practical value for promotion on steep mountain slopes. Summary of the Invention

[0006] To overcome the problems existing in the background technology, the present invention provides a speed-regulating and frequency-converting plum blossom harvester, which allows people to directly harvest plum blossoms scattered on branches from the ground. It has a simple structure, is easy to operate, is safe and reliable, is convenient to carry in mountainous areas, does not damage plum blossom branches, does not affect the increase of plum blossom yield in the following year, has high harvesting efficiency, requires less manpower, and saves time and effort.

[0007] To achieve the objective of this invention, the technical solution adopted is as follows:

[0008] A variable-speed, variable-frequency ultrasonic plum blossom harvesting machine includes a beater, a transmission mechanism, a power transmission and harvesting rod, a connector, a handle, a control system and a variable-frequency system, a DC brushless geared motor, an aviation plug connector, and a backpack-type lithium battery. The beater includes a harvesting arm and a fixing hole located below the harvesting arm. The harvesting arm is divided into a left harvesting arm and a right harvesting arm. An ultrasonic generator is installed on the inner wall of both the left and right harvesting arms. A left ultrasonic enhancement plate is installed on the inner wall of the left harvesting arm where no ultrasonic generator is installed, and a right ultrasonic enhancement plate is installed on the inner wall of the right harvesting arm where no ultrasonic generator is installed. When the left and right harvesting arms move towards each other simultaneously and are fully in contact, they wrap around the ultrasonic generator, the left ultrasonic enhancement plate, and the right ultrasonic enhancement plate to form a complete harvesting arm.

[0009] Preferably, a screw drive motor is installed in the lower support portion of the left and right mining arms, and mining arm drive screws are installed at both ends of the screw drive motor. A mining arm drive screw sleeve is provided at the lower part of the left and right mining arms, which is threadedly engaged with the mining arm drive screw.

[0010] Preferably, the transmission mechanism includes a reciprocating rod for connecting and fixing the mining arm, the reciprocating rod is fixed to a pivot bearing through a fixing hole, and a conversion device is connected to the lower part of the reciprocating rod. The lower part of the conversion device is provided with a steel pipe track and a transmission rod fixing groove for fixing the power transmission to the mining arm.

[0011] Preferably, the power transmission and tapping rod includes a power transmission shaft, which is sleeved inside a carbon fiber housing. The power transmission shaft in the power transmission and tapping rod is connected to a DC brushless geared motor via a coupling in a connector, and rotates under the drive of the DC brushless geared motor.

[0012] Preferably, the control system and frequency conversion system include a power switch, a start button, and a control circuit board. The control circuit board is equipped with a CPU, a temperature sensor, a heat sink, a data acquisition and processor, and a switching power supply control system. The power switch has a start button on its side. The power switch and start button are mounted on a handle. A grip is provided on the power transmission and striking rod at the front of the handle. The power switch is electrically connected to the control circuit board via a power connection wire, and the start button is electrically connected to the control circuit board via a start switch wire. The control circuit board is electrically connected to a DC brushless geared motor via a battery wire. The DC brushless geared motor is connected to a portable lithium battery via an aviation plug connector wire.

[0013] Preferably, the transmission mechanism further includes a circular sliding bearing fixing groove for fixing the circular sliding bearing, the circular sliding bearing connecting the conversion device and the power transmission shaft in the mining rod, a steel pipe rail at the rear of the circular sliding bearing fixing groove, a transmission rod fixing groove at the rear of the steel pipe rail, and a power transmission shaft installed in the transmission rod fixing groove.

[0014] Preferably, the conversion device includes a slider fixedly connected to the crank connecting rod, the slider having a ball bearing inside, the rear of the crank connecting rod being connected to a rotating arm, the rotating arm being fixedly connected to a central shaft via a circular bearing fixing groove, the central shaft being connected to a power transmission shaft via a coupling, and the centerline of the central shaft being a straight line with the center of symmetry of the conversion device.

[0015] Preferably, the power transmission and the harvesting rod are connected to the transmission mechanism and the DC brushless geared motor through a specific quadrilateral lock hole interface. The DC brushless geared motor is rotatably connected to the conversion device in the transmission mechanism through the power transmission shaft. The conversion device drives the crank connecting rod to rotate, and the crank connecting rod drives the rotating arm to move 360°. The other end of the rotating arm is connected to the slider and drives the slider to swing back and forth. Above the slider is a rod that moves back and forth, driving the harvesting arm to move back and forth 80°. The power transmission and the harvesting rod can also increase or decrease the number of connecting rods according to the height of the plum tree branches, which is suitable for plum trees within 8m to deal with branches of different heights.

[0016] Preferably, the surface of the DC brushless geared motor housing is provided with DC brushless geared motor heat dissipation holes. The DC brushless geared motor is a DC brushless geared self-cooling motor. The DC brushless geared motor contains a planetary gear reducer with a power of 150W, a motor speed of 1500±300r / min, and a frequency of 25±5Hz.

[0017] Preferably, the control system and the end of the frequency converter are electrically connected to the DC brushless geared motor via control wires, and the DC brushless geared motor is then connected to the portable lithium battery via an aviation plug connector.

[0018] The transmission mechanism is widely used due to its smooth transmission and low impact, vibration, and noise. It can smoothly transmit the rotation of a DC brushless geared motor to the telescopic rod through a coupling. A steel pipe track is also used to reduce friction and reduce kinetic energy loss, making the vibration more powerful. The telescopic rod is also equipped with a circular sliding bearing to support the power transmission rod. The point contact between the rod and the bearing outer sleeve allows for rotation with minimal frictional resistance. Therefore, the circular bearing has low friction and is relatively stable, not changing with the bearing speed, and can achieve a smooth rotational motion with high sensitivity and precision. This serves two purposes: stabilizing the telescopic rod and reducing friction, all to maximize the transmission of kinetic energy to the beater.

[0019] The control circuit board is equipped with heat sinks for the DC brushless geared motor. During motor operation, a large amount of heat is generated inside. If this heat cannot be effectively dissipated, it will cause the motor to overheat, thus affecting its performance and lifespan. Therefore, in order to ensure the normal operation of the motor, heat sinks are installed on the control circuit board to help dissipate the heat generated by the generator.

[0020] DC brushless geared motors can work for extended periods. They feature a simple structure, no commutation sparks, a wide speed range, low noise, and small size. Furthermore, they are equipped with heat dissipation holes to enhance heat dissipation and have a lifespan of up to 20,000 hours.

[0021] The protection provided by the control system and frequency converter system includes overload protection, short circuit protection, undervoltage protection, loss of excitation protection, undercurrent protection, and leakage protection for the DC brushless motor. It enables automatic power increase during slow start-up. The current of the DC brushless geared motor is fed back to the CPU, and the control system and frequency converter system provide power-off protection. When the current is too high, the control system and frequency converter system provide power-off protection to prevent the DC brushless geared motor from stalling and burning out. When working, hold the handle firmly, first turn on the power switch, press and hold it for three seconds to start to prevent accidental activation, and then turn on the start switch to begin operation.

[0022] The control system and the inverter system are electrically connected to the DC brushless geared motor via wires. The DC brushless geared motor is then connected to the portable lithium battery via an aviation plug connector. The portable lithium battery is a rechargeable, high-performance, dedicated portable lithium battery. A full charge of the portable lithium battery can provide 4-8 hours of continuous operation.

[0023] The beneficial effects of this invention are as follows:

[0024] The variable frequency speed-regulating plum blossom harvester of the present invention has the characteristics of simple structure, safety and reliability, simple operation, lightweight and portable and high efficiency, and avoids the danger of falling when picking by manual climbing trees;

[0025] This invention uses a branch shaking harvesting method. Since the vibration position is closer to the plum blossom, this method can reduce the loss of vibration transmission, making the vibration more concentrated on the target and improving the harvesting efficiency. At the same time, the branch shaking harvesting method can easily harvest multiple plum blossoms, reducing the time and manpower required for harvesting.

[0026] The power transmission and harvesting rod used in this invention can freely increase or decrease the number of rods as the height of the plum blossom branches changes. Each rod section is 1.5m long, and when fully extended, it is suitable for plum blossom harvesting work within 8m.

[0027] The outer shell of this invention is made of carbon fiber, which is not only lightweight and portable, but also effectively reduces the impact on the branches, preventing damage. Furthermore, carbon fiber material has excellent properties such as high strength and corrosion resistance, ensuring a longer service life and better performance for the harvester during use.

[0028] The variable speed frequency conversion plum blossom harvester of this invention can not only harvest plum blossoms, but also osmanthus, peach blossoms, cherry blossoms, etc., and has a wide range of uses;

[0029] This invention incorporates an emergency stop device to ensure timely power cut-off when the DC brushless geared motor faces the risk of stalling, thereby preventing damage from overheating. This device intervenes rapidly to interrupt the current and protect the motor's safe operation when abnormal motor operation or exceeding safety thresholds is detected. This not only extends the motor's lifespan but also effectively reduces potential safety hazards caused by motor failures.

[0030] This invention is suitable for steep mountain slopes with an angle of 25° or more, with a total weight of less than 5Kg. It can be powered by a backpack-type lithium battery for 4-8 hours, with a rated voltage of 36V and a capacity of 12Ah. The DC brushless geared motor has a power of 150W.

[0031] This invention features an ultrasonic generator and an ultrasonic intensifier plate on the inner wall of the beater. High-frequency ultrasonic waves induce cavitation and vibration in the plum blossoms, causing them to fall off and preventing damage to the branches from the beating. The close-fitting arms effectively protect the ultrasonic generator and ultrasonic intensifier plate. Attached Figure Description

[0032] Figure 1 A schematic diagram of the overall structure of the variable frequency ultrasonic plum blossom harvester designed in this invention.

[0033] Figure 2 Schematic diagram of the beater structure of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 1 ;

[0034] Figure 3 Schematic diagram of the beater structure of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 2 ;

[0035] Figure 4 Schematic diagram of the beater structure of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 3 ;

[0036] Figure 5 Schematic diagram of the beater structure of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 4 ;

[0037] Figure 6A partial structural diagram of the beater of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 1 ;

[0038] Figure 7 A partial structural diagram of the beater of the variable frequency ultrasonic plum blossom harvester designed for this invention. Figure 2 ;

[0039] Figure 8 A schematic diagram of the transmission mechanism of the variable frequency ultrasonic plum blossom harvester designed for this invention.

[0040] Figure 9 A schematic diagram of the conversion device structure of the speed-regulating frequency-converting ultrasonic plum blossom harvester designed for this invention;

[0041] Figure 10 A schematic diagram of the power transmission and internal cross-sectional structure of the tapping rod of the variable frequency ultrasonic tapping machine designed for this invention.

[0042] Figure 11 A schematic diagram of the connection structure of the variable frequency ultrasonic plum blossom harvester designed for this invention.

[0043] Figure 12 A schematic diagram of the control system and the external structure of the variable frequency system of the speed-regulating and frequency-converting ultrasonic plum blossom harvester designed for this invention;

[0044] Figure 13 A schematic diagram of the internal structure of the control system and frequency conversion system of the speed-regulating and frequency-converting ultrasonic plum blossom harvester designed for this invention.

[0045] Figure 14 A schematic diagram of the aviation plug connector and the portable lithium battery structure of the variable frequency ultrasonic plum blossom harvester designed for this invention.

[0046] In the diagram: 1. Beater; 2. Transmission mechanism; 3. Power transmission and striking rod; 4. Connector; 5. Handle; 6. Handle; 7. Control system and frequency conversion system; 8. DC brushless geared motor; 9. Aviation plug connector; 10. Backpackable lithium battery; 11. Striking arm; 12. Fixing hole; 111. Left striking arm; 112. Right striking arm; 113. Ultrasonic generator; 114. Left ultrasonic intensifier plate; 115. Right ultrasonic intensifier plate; 116. Screw drive motor; 117. Striking arm drive screw; 118. Striking arm drive screw sleeve; 21. Reciprocating rod; 22. Pivot bearing; 23. Conversion device; 24. Circular slide. 25. Circular sliding bearing fixing slot; 26. Steel pipe track; 27. Transmission rod fixing slot; 31. Power transmission shaft; 32. Carbon fiber shell; 71. Power switch; 72. Start switch; 73. Control circuit board; 74. CPU; 75. Temperature sensor; 76. Heat sink; 77. Data acquisition and processor; 78. Switching power supply control system; 79. Power connection wire; 710. Start switch wire; 711. Battery wire; 81. Heat dissipation hole of DC brushless geared motor; 231. Slider; 232. Ball bearing; 233. Crank connecting rod; 234. Rotating arm; 235. Circular bearing fixing slot; 236. Central shaft. Detailed Implementation

[0047] The technical solutions in the embodiments of this design will be clearly and completely described below in conjunction with the technical content of the embodiments described herein. Obviously, the described embodiments are only a part of the embodiments of this design, and not all of the embodiments. Based on the embodiments of this design, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this design.

[0048] like Figure 1 As shown, a variable speed frequency ultrasonic plum blossom harvesting machine includes a beater 1, a transmission mechanism 2, a power transmission and harvesting rod 3, a connector 4, a handle 5, a grip 6, a control system and a frequency conversion system 7, a DC brushless geared motor 8, an aviation plug connector 9, and a backpack-type lithium battery 10.

[0049] like Figure 2 , 3As shown in Figures 4 and 5, a variable frequency ultrasonic plum blossom harvesting machine is disclosed. The harvesting device 1 includes a harvesting arm 11 and a fixing hole 12 located below the harvesting arm 11. The harvesting arm 11 is divided into a left harvesting arm 111 and a right harvesting arm 112. An ultrasonic generator 113 is installed on the inner wall of both the left and right harvesting arms 111 and 112. A left ultrasonic enhancement plate 114 is installed on the inner wall of the left harvesting arm 111 where the ultrasonic generator 113 is not installed, and a right ultrasonic enhancement plate 115 is installed on the inner wall of the right harvesting arm 112 where the ultrasonic generator 113 is not installed. When the left and right harvesting arms 111 and 112 move towards each other and are fully in contact, they wrap the ultrasonic generator 113, the left ultrasonic enhancement plate 114, and the right ultrasonic enhancement plate 115 to form a complete harvesting arm 11.

[0050] like Figure 6 , 7 As shown, a variable speed frequency ultrasonic plum blossom harvester has a screw drive motor 116 installed in the lower support part of the left harvesting arm 111 and the right harvesting arm 112. The two ends of the screw drive motor 116 are equipped with harvesting arm drive screws 117. The lower part of the left harvesting arm 111 and the right harvesting arm 112 is provided with a harvesting arm drive screw sleeve 118 that is threadedly engaged with the harvesting arm drive screw 117.

[0051] like Figure 8 As shown, a variable frequency ultrasonic plum blossom harvester includes a transmission mechanism 2 comprising a reciprocating rod 21 for connecting and fixing the harvesting arm 11. The reciprocating rod 21 is fixed to a fulcrum bearing 22 through a fixing hole 12. A conversion device 23 is connected to the lower part of the reciprocating rod 21. The lower part of the conversion device 23 is provided with a steel pipe track 26 and a transmission rod fixing groove 27 for fixing the power transmission and the harvesting arm 3. The transmission mechanism 2 also includes a circular sliding bearing fixing groove 25 for fixing the circular sliding bearing 24. The rear part of the circular sliding bearing fixing groove 25 is provided with a steel pipe track 26. The rear part of the steel pipe track 26 is provided with a transmission rod fixing groove 27 and a power transmission and harvesting arm 3.

[0052] like Figure 9 As shown, a variable frequency ultrasonic plum blossom harvester has a conversion device 23 including a slider 231 fixedly connected to a crank connecting rod 233. A ball bearing 232 is provided inside the slider 231. The rear part of the crank connecting rod 233 is connected to a rotating arm 234. The rotating arm 234 is fixed by a circular bearing fixing groove 235, so that the central shaft 236 is connected to the power transmission shaft 31.

[0053] like Figure 10As shown, a variable speed frequency ultrasonic plum blossom harvester has a power transmission shaft 31 encased in a carbon fiber shell 32. The power transmission and harvesting rod 3 are connected to the transmission mechanism 2 and the DC brushless geared motor 8 through a specific quadrilateral lock hole interface.

[0054] like Figure 9 , 10 As shown in Figure 11, a variable frequency ultrasonic plum blossom harvester is described. The rotation of the DC brushless geared motor 8 is transmitted to the conversion device 23 in the transmission mechanism 2 through the power transmission shaft 31 in the harvesting rod 3. The conversion device 23 drives the crank connecting rod 233 to rotate, and the crank connecting rod 233 drives the rotating arm 234 to move 360°. The other end of the rotating arm 234 is connected to the slider 231 and drives the slider 231 to move back and forth. The harvesting arm 11 is connected above the slider 231 and drives the beater 1 to swing back and forth 80°.

[0055] like Figure 12 As shown, a variable frequency ultrasonic plum blossom harvester has a handle 5 on the front end of the handle 6 and a grip on the harvesting rod 3. The surface of the housing of the DC brushless geared motor 8 is provided with DC brushless geared motor heat dissipation holes 81. The DC brushless geared motor 8 is a DC brushless geared self-cooling motor.

[0056] like Figure 13 , 14 As shown, a variable frequency ultrasonic plum blossom harvester includes a control system and a frequency conversion system 7. The control system includes a power switch 71, and a start switch 72 is located on the side of the power switch 71. The power switch 71 and the start switch 72 are mounted on a handle 6. The power switch 71 is electrically connected to the control circuit board 73 via a control circuit board 73, and the start switch 72 is electrically connected to the control circuit board 73 via a start switch wire 710. The control circuit board 73 is electrically connected to a DC brushless geared motor 8 via a battery wire 711. The DC brushless geared motor 8 is connected to a portable lithium battery 10 via an aviation connector 9. The DC brushless geared motor 8 is a DC brushless geared self-cooling motor containing a planetary gear reducer. Its rated power is 150W, its output speed is 1500±300r / min, and its frequency is 25±5Hz.

[0057] like Figure 14 As shown, a variable frequency ultrasonic plum blossom harvester has a rechargeable high-performance dedicated rechargeable lithium battery 10 with a rated voltage of 36V and a capacity of 12Ah. The rechargeable lithium battery 10 can work continuously for 4-8 hours when fully charged.

[0058] like Figure 1-14As shown, the variable frequency ultrasonic plum blossom harvester includes a beater 1, a transmission mechanism 2, a power transmission and harvesting rod 3, a connector 4, a handle 5, a grip 6, a control system and a frequency conversion system 7, a DC brushless geared motor 8, an aviation plug connector 9, and a portable lithium battery 10. Before operation, ensure the portable lithium battery 10 is charged. After assembling the portable lithium battery 10, determine the height of the plum blossom tree and whether the power transmission and harvesting rod 3 needs to be lengthened. If so, take out a spare power transmission and harvesting rod 3 and connect it to the machine via connector 4. The two ends of the harvesting rod 3 are connected to the DC brushless geared motor 8 and the transmission mechanism 2 respectively. The other end of the transmission mechanism 2 is connected to the beater 1. Then, the portable lithium battery 10 is connected to the DC brushless geared motor using the aviation plug connector 9. The assembly is now complete. Select the plum blossom branches to be harvested and beat the branches with the two harvesting arms on the beater. After fixing it, hold the handle 6 with one hand and use the other hand to turn on the power switch 71 and the start switch 72. First, turn on the power switch 71 and press and hold it for three seconds to start to prevent accidental activation. Then, turn on the start switch 72 to start working.

[0059] After pressing the switch, hold the handle 6 with both hands and wait for the DC brushless geared motor 8 to slowly rotate. The rotation of the DC brushless geared motor 8 drives the power transmission shaft 31 inside the mining arm 3 to rotate together. One end of the power transmission shaft 31 is connected to the conversion device 23 inside the transmission mechanism 2. The conversion device 23 drives the crank connecting rod 233 to rotate. The crank connecting rod 233 drives the rotating arm 234 to move 360°. The other end of the rotating arm 234 is connected to the slider 231 and drives the slider 231 to move back and forth. The rod 21 above the slider 231 moves back and forth, driving the mining arm 11 to move back and forth 80°.

[0060] At this point, the direction of the force also changes; by striking the branches with such a back-and-forth slapping motion, the plum blossoms are knocked down; after the power is turned on, when the slapper gets stuck on the branch, the DC brushless geared motor 8 will operate under overload. At this time, the CPU 74 will immediately disconnect the power supply to the DC brushless geared motor 8 to prevent the DC brushless geared motor 8 from stalling and burning out; at this time, simply remove the slapper 1, put it back against the branch, and press the switch to continue working.

[0061] The screw drive motor 116 rotates synchronously in steps, driving the harvesting arm drive screw 117 to rotate, which in turn drives the harvesting arm drive sleeve 118 to move in steps. This causes the left harvesting arm 111 and the right harvesting arm 112 to move towards each other and either close or unfold. Both the left and right harvesting arms 111 and 112 can perform the beating process when they are close or unfolded. When the left and right harvesting arms 111 and 112 are fully unfolded, the plum blossom branch is clamped in the area between the left and right harvesting arms 111 and 112. The ultrasonic generator 113 is activated, and the ultrasonic generator 113 releases high-frequency vibrations. The left ultrasonic enhancement plate 114 and the right ultrasonic enhancement plate 115 enhance and strengthen the ultrasonic waves emitted by the ultrasonic generator 113 on the opposite side, causing high-frequency ultrasonic vibrations to form in the area between the left and right harvesting arms 111 and 112. This causes the plum blossom to fall off quickly due to high-frequency cavitation and resonance, avoiding damage to the branch from beating.

[0062] The variable frequency speed-regulating plum blossom harvester of this invention features a simple structure, safety and reliability, easy operation, portability, and high efficiency, while avoiding the danger of falling branches during manual tree climbing. Employing a branch-vibration harvesting method, the vibration is closer to the plum blossom, reducing vibration transmission loss and concentrating the vibration on the target, thus improving harvesting efficiency. This method also allows for convenient harvesting of multiple plum blossoms, reducing the time and manpower required. The power transmission and harvesting rods can be freely adjusted in number to accommodate changes in the height of the plum blossom branches, with each rod section being 1.5m long, making it suitable for plum blossom harvesting up to 8m in length. The carbon fiber outer shell is lightweight and portable, effectively reducing impact on the branches and preventing damage. In addition, carbon fiber materials possess excellent properties such as high strength and corrosion resistance, ensuring a longer service life and better performance for the harvester. It can be used not only for harvesting plum blossoms but also for osmanthus, peach blossoms, cherry blossoms, and other flowers, making it widely applicable. An emergency stop device is added to ensure timely power cut-off when the DC brushless geared motor faces the risk of stalling, preventing damage from overheating. This device intervenes quickly to interrupt the current and protect the motor's safe operation when abnormal motor operation or exceeding safety thresholds is detected. This not only extends the motor's lifespan but also effectively reduces potential safety hazards caused by motor failure. Suitable for steep mountain slopes above 25°, with a total weight of less than 5kg, it features a backpack-mounted lithium battery providing 4-8 hours of continuous operation (rated voltage 36V, capacity 12Ah), and a 150W DC brushless geared motor. An ultrasonic generator and ultrasonic reinforcement plate are installed on the inner wall of the harvester. High-frequency ultrasonic waves cause the plum blossoms to vibrate in unison, promoting their detachment and preventing damage to branches. The harvesting arms are brought together to effectively protect the ultrasonic generator and ultrasonic reinforcement plate.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable frequency ultrasonic plum blossom harvesting machine, comprising a beater (1), a transmission mechanism (2), a power transmission and harvesting rod (3), a connector (4), a handle (5), a grip (6), a control system and a frequency conversion system (7), a DC brushless geared motor (8), an aviation plug connector (9), and a backpack-type lithium battery (10), characterized in that: The tapping device (1) includes a tapping arm (11) and a fixing hole (12) located below the tapping arm (11). The tapping arm (11) is divided into a left tapping arm (111) and a right tapping arm (112). An ultrasonic generator (113) is installed on the inner wall of both the left tapping arm (111) and the right tapping arm (112). A left ultrasonic enhancement plate (114) is installed on the inner wall of the left tapping arm (111) where the ultrasonic generator (113) is not installed, and a right ultrasonic enhancement plate (115) is installed on the inner wall of the right tapping arm (112) where the ultrasonic generator (113) is not installed. When the left tapping arm (111) and the right tapping arm (112) move towards each other and are fully in contact, they wrap the ultrasonic generator (113), the left ultrasonic enhancement plate (114) and the right ultrasonic enhancement plate (115) to form a complete tapping arm (11). The lower support portion of the left mining arm (111) and the right mining arm (112) is equipped with a screw drive motor (116), and mining arm drive screws (117) are installed at both ends of the screw drive motor (116). The lower part of the left mining arm (111) and the right mining arm (112) is provided with a mining arm drive screw sleeve (118) that is threadedly engaged with the mining arm drive screw (117). The transmission mechanism (2) includes a reciprocating rod (21) for connecting and fixing the mining arm (11). The reciprocating rod (21) is fixed to a pivot bearing (22) through the fixing hole (12). A conversion device (23) is connected to the lower part of the reciprocating rod (21). The lower part of the conversion device (23) is provided with a steel pipe rail (26) and a transmission rod fixing groove (27) for fixing the power transmission and mining arm (3). The power transmission and tapping rod (3) includes a power transmission shaft (31), which is fitted inside a carbon fiber shell (32). The power transmission shaft (31) in the power transmission and tapping rod (3) is connected to the DC brushless geared motor (8) through the coupling (41) in the connector (4), and rotates under the drive of the DC brushless geared motor (8). The control system and frequency conversion system (7) include a power switch (71), a start button (72) and a control circuit board (73). The control circuit board (73) is equipped with a CPU (74), a temperature sensor (75), a heat sink (76), a data acquisition and processor (77) and a switching power supply control system (78). The side of the power switch (71) is equipped with a start button (72). The power switch (71) and the start button (72) are mounted on the handle (6). The power transmission and striking rod (3) at the front end of the handle (6) is equipped with a grip (5). The power switch (71) is electrically connected to the control circuit board (73) through a power connection wire (79) and the start button (72) is electrically connected to the start switch wire (710) through a start switch wire. The control circuit board (73) is electrically connected to the DC brushless geared motor (8) through a battery wire (711). The DC brushless geared motor (8) is connected to the portable lithium battery (10) through an aviation plug connector (9).

2. The variable frequency ultrasonic plum blossom harvester according to claim 1, characterized in that: The transmission mechanism (2) also includes a circular sliding bearing fixing groove (25) for fixing and installing a circular sliding bearing (24), and the circular sliding bearing (24) connects the conversion device (23) to the power transmission shaft (31) in the power transmission and mining rod (3).

3. The variable frequency ultrasonic plum blossom harvester according to claim 2, characterized in that: The rear part of the circular sliding bearing fixing groove (25) is provided with a steel pipe rail (26), the rear part of the steel pipe rail (26) is provided with a transmission rod fixing groove (27), and a power transmission shaft (31) is installed in the transmission rod fixing groove (27).

4. The variable frequency ultrasonic plum blossom harvester according to claim 1, characterized in that: The conversion device (23) includes a slider (231) fixedly connected to the crank connecting rod (233), and a ball bearing (232) is provided inside the slider (231). The rear part of the crank connecting rod (233) is connected to the rotating arm (234).

5. The variable frequency ultrasonic plum blossom harvester according to claim 4, characterized in that: The rotating arm (234) is fixedly connected to the central shaft (236) through the circular bearing fixing groove (235). The central shaft (236) is connected to the power transmission shaft (31) through the coupling (41). The center line of the central shaft (236) is on the same straight line as the center of symmetry of the conversion device (23).

6. The variable frequency ultrasonic plum blossom harvester according to claim 1, characterized in that: The power transmission and the tapping rod (3) are connected to the transmission mechanism (2) and the DC brushless geared motor (8) through a specific quadrilateral lock hole interface. The DC brushless geared motor (8) is rotatably connected to the conversion device (23) in the transmission mechanism (2) through the power transmission shaft (31).

7. The variable frequency ultrasonic plum blossom harvester according to claim 6, characterized in that: The conversion device (23) drives the crank connecting rod (233) to rotate, and the crank connecting rod (233) drives the rotating arm (234) to move 360°. The other end of the rotating arm (234) is connected to the slider (231) and drives the slider (231) to move back and forth. The rod (21) above the slider (231) moves back and forth, which drives the harvesting arm (11) to swing back and forth 80°.

8. The variable frequency ultrasonic plum blossom harvester according to claim 1, characterized in that: The surface of the housing of the brushless DC geared motor (8) is provided with heat dissipation holes (81), and the brushless DC geared motor (8) is a brushless DC geared self-cooling motor.

9. The variable frequency ultrasonic plum blossom harvester according to claim 8, characterized in that: The DC brushless geared motor (8) contains a planetary gear reducer with a power of 150W, a motor speed of 1500±300r / min, and a frequency of 25±5Hz.

10. The variable frequency ultrasonic plum blossom harvester according to claim 1, characterized in that: The control system and the end of the frequency conversion system (7) are electrically connected to the DC brushless geared motor (8) through the switching power supply control system (78). The DC brushless geared motor (8) is then connected to the portable lithium battery (10) through the aviation plug connector (9).

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