Street tree deep root solid fertilizer applicator

Abstract

This utility model relates to the technical field of deep-root solid fertilizer application devices for roadside trees, and in particular to a deep-root solid fertilizer application device for roadside trees, comprising a controller, a device housing, a solid fertilizer storage bin, a ditching and mixing mechanism, and a backfilling and compaction mechanism; the controller is electrically connected to the solid fertilizer storage bin, the ditching and mixing mechanism, and the backfilling and compaction mechanism; the device housing contains a solid fertilizer storage bin, a ditching and mixing mechanism at the bottom, backfilling and compaction mechanisms on the front and rear sides, and a push rod on the left side; the controller is mounted on the push rod; the solid fertilizer storage bin is connected to the ditching and mixing mechanism, which includes a guide hole drilling component and a fertilizer discharge component. This utility model, taking into account the small size of roadside tree pits, the need for on-site hardening, and the high density of the soil, meets the practical needs of simple on-site operation, time and labor saving, and low investment, achieving the effects of precise fertilization, deep fertilization, automated backfilling and compaction, and modular and convenient operation.

Description

Technical Field

[0001] This utility model relates to the technical field of deep-root solid fertilizer application devices for roadside trees, and in particular to a deep-root solid fertilizer application device for roadside trees. Background Technology

[0002] Street trees line both sides of urban roads, and due to the prevalence of hard paving around them, fertilization and maintenance are difficult. Currently, the main methods are broadcasting and burying fertilizer. Broadcasting applies fertilizer to the surface, but this method is susceptible to being washed away by rainwater, and some fertilizer also evaporates into the air, reducing fertilizer utilization. Burying fertilizer largely avoids these two drawbacks and improves fertilizer utilization, but it is time-consuming and labor-intensive, with higher time and labor costs. Additionally, the fertilizer is buried relatively shallowly, which doesn't effectively guide root growth to deeper areas, and the large diameter of conventional drilling equipment can cause significant damage to the tree's root system.

[0003] The patent with patent number "CN107820818B" and titled "A Tree Fertilizer Application Device for Landscaping" uses a box connected to a motor to provide liquid fertilizer to trees, solving the problem of fertilizer piling up on the ground and trees not being able to absorb nutrients in time. The advantage is that applying liquid fertilizer is time-saving and labor-saving; the disadvantages are that liquid fertilizer has a shorter effective period and is more damaging to the environment.

[0004] The patent, numbered CN215223712U and titled "A Fertilizer Application Mechanism for Street Trees," uses a four-wheel tractor to install a crossbar to fix the fertilization mechanism. It employs a hammer-based drilling method, based on the principle of a tamping machine, to force liquid fertilizer injection pipes into the soil surrounding the street trees. Its advantages include a specific design for street trees; however, its disadvantages include a large size, a short-lasting effect of the liquid fertilizer, and significant environmental damage.

[0005] Based on the above problems, there is an urgent need for a specialized device that can achieve deep root fertilization with small-diameter pores, precise slow release of solid fertilizer, and full automation of the trenching-backfilling process, in order to reduce root damage rate and extend fertilizer effectiveness. Utility Model Content

[0006] To overcome existing shortcomings, this utility model focuses on the integrated design of drilling and fertilization by drilling guide holes, applying solid fertilizer, and backfilling soil. Taking into account the characteristics of small tree pits, hardened site, and high soil density of roadside trees, it meets the actual needs of simple on-site operation, saving time and labor, and low investment, and provides a deep root solid fertilizer application device for roadside trees.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a deep-root solid fertilizer application device for roadside trees, including a controller, a device shell, a solid fertilizer storage bin, a trenching and fertilizer mixing mechanism, and a backfilling and compaction mechanism; the controller is electrically connected to the solid fertilizer storage bin, the trenching and fertilizer mixing mechanism, and the backfilling and compaction mechanism; the device shell has a solid fertilizer storage bin inside, a trenching and fertilizer mixing mechanism at the bottom, a backfilling and compaction mechanism on the front and rear sides, and a push rod on the left side; the controller is mounted on the push rod; the solid fertilizer storage bin is connected to the trenching and fertilizer mixing mechanism, which includes a guide hole drilling component and a fertilizer discharge component; the fertilizer discharge component includes a fertilizer discharge box, a fertilizer pipe, and a fertilizer discharge auger; the fertilizer discharge box is connected to the solid fertilizer storage bin, and its bottom is connected to the fertilizer pipe through a fertilizer inlet; the fertilizer pipe has a fertilizer discharge auger inside and a fertilizer outlet at the bottom; the guide hole drilling component includes a transmission box, a retaining cover, and auger blades; the transmission box is installed on the upper part of the fertilizer pipe, and a retaining cover is provided at the bottom; auger blades are installed below the retaining cover.

[0008] According to another embodiment of the present invention, the transmission box is further provided with a hydraulic motor, a drive gear, a driven gear, a hollow shaft and a bearing seat; the output shaft of the hydraulic motor is connected to the drive gear, the drive gear meshes with the driven gear, and the driven gear is mounted on the hollow shaft; the hollow shaft is sleeved on the outside of the lower tube and mounted on the transmission box through the bearing seat.

[0009] According to another embodiment of the present invention, the transmission box is further comprising an output shaft of a hydraulic cylinder connected to the top, and the hydraulic cylinder is mounted at the bottom of the fertilizer discharge box.

[0010] According to another embodiment of the present invention, the fertilizer outlet is further provided with an inverted cone at its bottom, and a pressure sensor is installed inside the inverted cone.

[0011] According to another embodiment of the present invention, the fertilizer discharge box is further provided with a rotary motor on its side, and the output shaft of the rotary motor passes through the fertilizer discharge box body and is connected to a spiral rod disposed inside.

[0012] According to another embodiment of the present invention, the solid fertilizer storage chamber is a detachable chamber body, and the chamber body is equipped with a temperature and humidity sensor and a liquid level sensor. The bottom is an inclined surface and is connected to the side of the fertilizer discharge box; the inclined surface has an angle greater than 30° with the horizontal plane.

[0013] According to another embodiment of the present invention, the push rod further includes a grip handle, on which a button module and a display module are provided, and a controller is provided inside; the controller is electrically connected to the button module and the display module.

[0014] According to another embodiment of the present invention, the backfilling and compaction mechanism further includes a retractable shovel head, a vibrating motor, and a roller. The retractable shovel head includes an electric push rod and a shovel head. The top of the shovel head is mounted on the side of the device housing via the electric push rod, and a vibrating motor is provided on the back. The roller is fixed to the rear side of each set of shovel heads via a connecting rod.

[0015] According to another embodiment of the present invention, the controller further includes a main control chip, a communication module, a storage module, and a power management module; the main control chip establishes data connections with a pressure sensor, a temperature and humidity sensor, and a liquid level sensor through the communication module, and establishes control connections with the hydraulic valves of the hydraulic motor, rotary motor, vibration motor, electric push rod, and hydraulic cylinder; the storage module is equipped with a fertilizer parameter database and a sensor historical data storage area; the power management module integrates an overload protection circuit and is connected to each electrical component through cables.

[0016] The beneficial effects of this utility model are: Efficient and precise fertilization: Through the linkage of the controller and multiple sensors, the soil condition (pressure sensor), solid fertilizer storage (liquid level sensor) and the environment inside the silo (temperature and humidity sensor) can be monitored in real time. Combined with the pre-set fertilization parameters, the amount of fertilizer applied, the drilling depth and the compaction intensity are automatically adjusted to achieve precise fertilization and avoid resource waste. Deep fertilization and root protection: The guide hole drilling component uses spiral blades and hydraulic drive to quickly drill deep guide holes. Combined with the fertilizer feeding spiral, it can directly deliver fertilizer to the dense root area, improve nutrient absorption efficiency. The inverted cone fertilizer outlet design, combined with a pressure sensor, can dynamically adjust the fertilizer feeding resistance to avoid blockage and reduce mechanical damage to the root system. Automated backfilling and compaction: The backfilling and compaction mechanism works in conjunction with a retractable shovel and a vibrating motor to quickly backfill soil and compact it in layers. The roller further flattens the surface to ensure the stability of the soil structure after fertilization and reduce soil erosion. Modular and easy to operate: The solid fertilizer storage compartment is designed to be detachable for easy cleaning and replenishment. The inclined bottom (>30°) combined with the screw rod for forced fertilizer discharge prevents fertilizer from caking. The push rod integrates buttons and a display screen, supporting one-button start / stop and parameter setting, reducing the difficulty of manual operation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 yes Figure 3 Sectional view of AA; Figure 5 This is a diagram of the internal structure of the transmission box; Figure 6 This is a diagram of the internal structure of the fertilizer discharge box; Figure 7 This is the electrical wiring diagram for this utility model.

[0019] In the diagram: 1. Controller; 2. Device housing; 3. Solid fertilizer storage bin; 4. Trenching and fertilizer mixing mechanism; 5. Backfilling and compaction mechanism; 6. Push rod; 7. Guide tunnel drilling assembly; 8. Fertilizer discharge assembly; 9. Fertilizer discharge box; 10. Fertilizer discharge pipe; 11. Fertilizer discharge auger; 12. Transmission box; 13. Soil retaining cover; 14. Spiral blade; 15. Hydraulic motor; 16. Drive gear; 17. Driven gear; 18. Hollow shaft; 19. Bearing seat; 20. Hydraulic cylinder; 21. Inverted cone; 22. Pressure sensor; 23. Rotary motor; 24. Spiral rod; 25. Temperature and humidity sensor; 26. Liquid level sensor; 27. Handle; 28. Button module; 29. ​​Display module; 30. Telescopic shovel head; 31. Vibration motor; 32. Roller; 33. Electric push rod; 34. Shovel head; 35. Main control chip; 36. Communication module; 37. Storage module; 38. Power management module. Detailed Implementation

[0020] like Figure 1 This is a schematic diagram of the structure of this utility model, a deep-root solid fertilizer application device for roadside trees, including a controller 1, a device housing 2, a solid fertilizer storage bin 3, a trenching and fertilizer mixing mechanism 4, and a backfilling and compaction mechanism 5; the controller 1 is electrically connected to the solid fertilizer storage bin 3, the trenching and fertilizer mixing mechanism 4, and the backfilling and compaction mechanism 5; the device housing 2 has a solid fertilizer storage bin 3 inside, a trenching and fertilizer mixing mechanism 4 at the bottom, a backfilling and compaction mechanism 5 on the front and rear sides, and a push rod 6 on the left side; the controller 1 is mounted on the push rod 6; the solid fertilizer storage bin 3 is connected to the trenching and fertilizer mixing mechanism 4. The trenching and fertilizer mixing mechanism 4 includes a guide tunnel drilling component 7 and a fertilizer discharge component 8. The fertilizer discharge component 8 includes a fertilizer discharge box 9, a fertilizer discharge pipe 10, and a fertilizer discharge spiral 11. The fertilizer discharge box 9 is connected to the solid fertilizer storage bin 3, and its bottom is connected to the fertilizer discharge pipe 10 through a fertilizer inlet. The fertilizer discharge pipe 10 is equipped with a fertilizer discharge spiral 11 and has a fertilizer outlet at its bottom. The guide tunnel drilling component 7 includes a transmission box 12, a soil retaining cover 13, and spiral blades 14. The transmission box 12 is installed on the upper part of the fertilizer discharge pipe 10, and the soil retaining cover 13 is provided at its bottom. The spiral blades 14 are installed below the soil retaining cover 13.

[0021] Specifically, the chassis structure of the device housing 2 adopts a high-strength lightweight aluminum alloy frame, and the bottom is equipped with adjustable height and braked casters to ensure stable movement of the device; an independent hydraulic pump station and battery pack are installed at the rear of the push rod 6 to provide power to the hydraulic motor 15, electric push rod 33, and vibration motor 31, and to drive the wheel axle of the device; the guide hole drilling assembly 7 is vertically suspended below the front of the device by the hydraulic cylinder 20, and is raised off the ground when not in operation.

[0022] According to another embodiment of the present invention, the transmission box 12 is further provided with a hydraulic motor 15, a driving gear 16, a driven gear 17, a hollow shaft 18, and a bearing seat 19; the output shaft of the hydraulic motor 15 is connected to the driving gear 16, the driving gear 16 meshes with the driven gear 17, and the driven gear 17 is mounted on the hollow shaft 18; the hollow shaft 18 is sleeved on the outside of the lower tube 10 and mounted on the transmission box 12 through the bearing seat 19.

[0023] According to another embodiment of the present invention, the transmission box 12 is further comprising an output shaft of a hydraulic cylinder 20 connected to the top, and the hydraulic cylinder 20 is mounted at the bottom of the fertilizer discharge box 9.

[0024] According to another embodiment of the present invention, the fertilizer outlet is further provided with an inverted cone 21 at the bottom, and a pressure sensor 22 is installed inside the inverted cone 21.

[0025] According to another embodiment of the present invention, the fertilizer discharge box 9 is further provided with a rotary motor 23 on its side, and the output shaft of the rotary motor 23 passes through the body of the fertilizer discharge box 9 and is connected to a spiral rod 24 disposed inside.

[0026] According to another embodiment of the present invention, the solid fertilizer storage chamber 3 is a detachable chamber body, and a temperature and humidity sensor 25 and a liquid level sensor 26 are provided inside the chamber body. The bottom is an inclined surface and is connected to the side of the fertilizer discharge box 9. The inclined surface has an angle greater than 30° with the horizontal plane.

[0027] According to another embodiment of the present invention, the push rod 6 further includes a grip handle 27, on which a button module 28 and a display module 29 are provided, and a controller 1 is provided inside; the controller 1 is electrically connected to the button module 28 and the display module 29.

[0028] According to another embodiment of the present invention, the backfilling and compaction mechanism 5 further includes a telescopic shovel head 30, a vibration motor 31, and a roller 32. The telescopic shovel head 30 includes an electric push rod 33 and a shovel head 34. The top of the shovel head 34 is mounted on the side of the device housing 2 via the electric push rod 33, and the back is provided with a vibration motor 31. The roller 32 is fixed to the rear side of each set of shovel heads 34 via a connecting rod.

[0029] Specifically, the telescopic shovel head 30 is folded to both sides of the device via the electric push rod 33. After reaching the backfilling position, the shovel head 34 unfolds to both sides of the guide hole, the vibration motor 31 starts, and the roller 32 is automatically lowered to the ground. The backfilling and compaction mechanism 5 is coordinated with the movement of the device, i.e., the movement-compaction linkage: when the device moves forward, the roller 32 rotates to compact the soil, and the vibration motor 31 adjusts the vibration frequency according to the device speed to ensure uniform compaction.

[0030] According to another embodiment of the present invention, the main control chip 35 establishes data connections with the pressure sensor 22, the temperature and humidity sensor 25, and the liquid level sensor 26 respectively through the communication module 36, and establishes control connections with the hydraulic valves of the hydraulic motor 15, the rotary motor 23, the vibration motor 31, the electric push rod 33, and the hydraulic cylinder 20; the storage module 37 is equipped with a fertilizer parameter database and a sensor historical data storage area; the power management module 38 integrates an overload protection circuit and is connected to each electrical component through cables.

[0031] Specifically, the main control chip 35 can be an STM32H743VIT6 (ARM Cortex-M7 core, 480MHz clock speed, double-precision FPU, supports multi-protocol communication). It acquires analog signals (such as 0-10V voltage or 4-20mA current) from the pressure sensor 22 via its built-in ADC, interprets them as actual pressure values, connects to the temperature and humidity sensor 25 and the liquid level sensor 26 via I²C interface, and outputs PWM signals to drive the hydraulic motor 15 (frequency 1-10kHz, adjustable duty cycle). It controls the start / stop and speed of the rotary motor 23 and the vibration motor 31 via GPIO (with a motor driver chip such as DRV8873), sends digital signals to the electric actuator 33 controller (such as an L298N module) to set the extension / retraction stroke, and controls the opening and closing of the solenoid valve of the hydraulic cylinder 20 (valve island model: Festo) via RS485 / CAN bus. CPX-MPA); The communication module 36 includes an ESP32-C3 (Wi-Fi / Bluetooth dual-mode, for remote monitoring) for wireless communication, an isolated CAN transceiver for wired communication, sensor data: Modbus RTU protocol (temperature, humidity, and liquid level sensors), sampling frequency 10Hz, actuator commands: CANopen protocol (hydraulic system control), response delay <10ms, and remote interaction: MQTT protocol (uploading data to the cloud platform and distributing fertilization parameters).

[0032] Detailed operation process: Step 1: Equipment Preparation Install the detachable solid fertilizer storage compartment 3 into the device housing 2, confirming that the liquid level sensor 26 shows sufficient fertilizer and the temperature and humidity sensor 25 monitors that the environment inside the compartment is normal. Select the fertilization mode (such as depth, fertilization amount) via the button module 28 on the push rod 6, and the controller 1 calls the preset parameters in the storage module 37.

[0033] Step 2: Start trenching and fertilizer mixing Pressing the start button causes the hydraulic cylinder 20 to push the transmission box 12 downwards, bringing the spiral blades 14 into contact with the ground. The hydraulic motor 15 drives the drive gear 16 to rotate the hollow shaft 18, causing the spiral blades 14 to penetrate the soil to a set depth. Simultaneously, the soil retainer 13 prevents soil clods from splashing. The rotary motor 23 starts the spiral rod 24, pushing the fertilizer in the storage bin 3 into the fertilizer discharge box 9. The fertilizer discharge spiral 11 then transports the fertilizer through the fertilizer discharge pipe 10 to the fertilizer outlet. The pressure sensor 22 monitors the fertilizer discharge resistance and dynamically adjusts the fertilizer discharge speed.

[0034] Step 3: Deep application and thorough mixing of fertilizer The spiral blade 14 rotates continuously to form a guide hole. Fertilizer is evenly distributed at the bottom of the guide hole through the inverted cone 21. When the guide hole drilling component 7 rises, the spiral blade 14 slightly disturbs the soil to achieve preliminary fertilizer mixing.

[0035] Step 4: Backfill and compact. The telescopic shovel head 30 is extended to both sides of the guide hole via the electric push rod 33. The vibration motor 31 is started to make the shovel head 34 vibrate, pushing the excavated soil back into the guide hole. The roller 32 behind the connecting rod rolls and compacts the surface soil as the device moves forward, forming a flat ground surface.

[0036] Step 5: Status Monitoring and Adjustment The display module 29 provides real-time feedback on fertilizer application amount, tunnel depth, and equipment status. If the liquid level sensor 26 alarms, it prompts for fertilizer replenishment. When the temperature and humidity are abnormal, the controller 1 automatically starts ventilation inside the chamber.

[0037] Step 6: End of assignment Turn off the power, clean the residual fertilizer from the fertilizer discharge component, disassemble the solid fertilizer storage chamber 3 for maintenance, and retain the operation record in the data storage module 37 for analysis.

[0038] The above description is illustrative only and not restrictive of this utility model. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all such modifications, variations or equivalents will fall within the protection scope of this utility model.

Claims

1. A deep-root solid fertilizer application device for roadside trees, characterized in that, The device includes a controller (1), a housing (2), a solid fertilizer storage bin (3), a ditching and fertilizer mixing mechanism (4), and a backfilling and compaction mechanism (5); the controller (1) is electrically connected to the solid fertilizer storage bin (3), the ditching and fertilizer mixing mechanism (4), and the backfilling and compaction mechanism (5); the housing (2) contains the solid fertilizer storage bin (3), the ditching and fertilizer mixing mechanism (4) is located at the bottom, the backfilling and compaction mechanism (5) is located on the front and rear sides, and a push rod (6) is located on the left side; the controller (1) is mounted on the push rod (6); the solid fertilizer storage bin (3) is connected to the ditching and fertilizer mixing mechanism (4), and the ditching and fertilizer mixing mechanism (4) includes a guide hole drilling mechanism. The components (7) and the fertilizer discharge component (8) include a fertilizer discharge box (9), a fertilizer discharge pipe (10), and a fertilizer discharge spiral (11). The fertilizer discharge box (9) is connected to the solid fertilizer storage bin (3), and its bottom is connected to the fertilizer discharge pipe (10) through a fertilizer inlet. The fertilizer discharge pipe (10) is equipped with a fertilizer discharge spiral (11) and a fertilizer outlet at its bottom. The guide tunnel drilling component (7) includes a transmission box (12), a soil retaining cover (13), and spiral blades (14). The transmission box (12) is installed on the upper part of the fertilizer discharge pipe (10), and a soil retaining cover (13) is provided at its bottom. Spiral blades (14) are installed below the soil retaining cover (13).

2. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The transmission box (12) is equipped with a hydraulic motor (15), a drive gear (16), a driven gear (17), a hollow shaft (18), and a bearing seat (19); the output shaft of the hydraulic motor (15) is connected to the drive gear (16), the drive gear (16) meshes with the driven gear (17), and the driven gear (17) is mounted on the hollow shaft (18); the hollow shaft (18) is sleeved on the outside of the lower tube (10) and mounted on the transmission box (12) through the bearing seat (19).

3. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The top of the transmission box (12) is connected to the output shaft of the hydraulic cylinder (20), which is installed at the bottom of the fertilizer discharge box (9).

4. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, A reverse cone (21) is installed at the bottom of the fertilizer outlet, and a pressure sensor (22) is installed inside the reverse cone (21).

5. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The fertilizer discharge box (9) is equipped with a rotary motor (23) on its side. The output shaft of the rotary motor (23) passes through the body of the fertilizer discharge box (9) and is connected to a spiral rod (24) inside.

6. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The solid fertilizer storage chamber (3) is a detachable chamber. The chamber is equipped with a temperature and humidity sensor (25) and a liquid level sensor (26). The bottom is an inclined surface and is connected to the side of the fertilizer discharge box (9). The inclined surface has an angle greater than 30° with the horizontal plane.

7. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The push rod (6) includes a grip handle (27), on which a button module (28) and a display module (29) are provided, and a controller (1) is provided inside; the controller (1) is electrically connected to the button module (28) and the display module (29).

8. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The backfilling and compaction mechanism (5) includes a telescopic shovel head (30), a vibration motor (31), and a roller (32). The telescopic shovel head (30) includes an electric push rod (33) and a shovel head (34). The top of the shovel head (34) is mounted on the side of the device housing (2) via the electric push rod (33), and the back is equipped with a vibration motor (31). The roller (32) is fixed to the rear side of each set of shovel heads (34) via a connecting rod.

9. The deep-root solid fertilizer application device for roadside trees according to claim 1, characterized in that, The controller (1) includes a main control chip (35), a communication module (36), a storage module (37), and a power management module (38). The main control chip (35) establishes data connections with the pressure sensor (22), temperature and humidity sensor (25), and liquid level sensor (26) through the communication module (36), and establishes control connections with the hydraulic valves of the hydraulic motor (15), rotary motor (23), vibration motor (31), electric push rod (33), and hydraulic cylinder (20). The storage module (37) is equipped with a fertilizer parameter database and a sensor historical data storage area. The power management module (38) integrates an overload protection circuit and is connected to each electrical component through cables.

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