Drill bit for trunk injection machine

Abstract

The utility model relates to the technical field of trunk injection machines, in particular to a drill bit for a trunk injection machine, the drill bit is provided with a drill bit assembly, the drill bit assembly comprises a drill bit, a self-tapping thread section and a drill bit mounting rod, a liquid outlet is formed in the joint of the drill bit and the self-tapping thread section, and arc-shaped protrusions are symmetrically arranged on the two sides of the liquid outlet in the rotating direction of the drill bit; and wood chips generated by drilling are guided away to the two sides of the liquid outlet. By arranging the arc-shaped protrusions, wood chips are guided to the two sides, smoothness of a liquid outlet is guaranteed, liquid medicine can be continuously and stably injected into a tree trunk, the blocking situation is greatly reduced, the medicine injection operation can be continuously carried out, the maintenance cost of equipment is reduced, and the overall working efficiency is improved. And by arranging the locking protrusion and the locking clamping groove, circumferential rotation of the drill bit assembly relative to the rotating mandrel is limited, the drill bit assembly is not prone to rotating, and stability and accuracy of drilling are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tree trunk injection molding machine technology, and in particular to a drill bit for a tree trunk injection molding machine. Background Technology

[0002] Tree trunk injection machines, as important equipment for controlling tree diseases and pests in the field of forestry protection, occupy a key position in modern forestry development. Their working principle is to inject pesticides directly into the tree trunk, utilizing the tree's own vascular system to ensure the pesticide is evenly delivered to all parts of the tree, thereby achieving the purpose of controlling diseases and pests. Compared with traditional spraying methods, tree trunk injection machines have many significant advantages, such as more significant control effects, precise targeting of harmful organisms, minimal environmental pollution (avoiding pesticide drift and leakage), and effective protection for the applicator and surrounding organisms, greatly reducing harm to natural enemies and contributing to the maintenance of ecological balance. Therefore, they are widely used in forestry production, urban landscaping maintenance, and other scenarios.

[0003] Although trunk injection machines play an important role in the prevention and control of diseases and pests, there are still some problems with the existing trunk injection machine drill bits, such as the utility model patent with patent number: 202322548647.5 and patent name: an electric trunk injection machine. Regarding the design of the liquid outlet, it is located at the connection between the drill bit and the self-tapping thread. When drilling into the tree trunk, sawdust is squeezed into the outlet, obstructing the normal flow of the liquid. Operators often need to frequently stop work to disassemble the drill bit for cleaning, which undoubtedly increases labor intensity and reduces work efficiency. If cleaning is not timely, the pressure in the injection system will rise rapidly under continuous pressurization, exceeding the pressure capacity of the liquid pressurization device, causing component damage and leakage. In addition, regarding the connection between the drill bit and the rotating mandrel, the drill bit generally relies on a threaded connection or a single fixing method. When the tree trunk injection machine is working, due to external forces such as vibration and torque, the drill bit is prone to loosening and rotation, which not only affects the accuracy of drilling but may also cause the drill bit to fall off the rotating mandrel, posing a threat to the safety of the operator. Summary of the Invention

[0004] To address the above problems, this application provides a drill bit for a tree trunk injection molding machine, which includes a drill bit assembly. The drill bit assembly includes a drill bit, a self-tapping threaded section, and a drill bit mounting rod. The drill bit assembly has a liquid outlet channel, and a liquid outlet is provided at the connection between the drill bit and the self-tapping threaded section. The liquid outlet has symmetrical arc-shaped protrusions on both sides along the rotation direction of the drill bit to guide the sawdust generated during drilling away from both sides of the liquid outlet.

[0005] In one embodiment, the drill bit assembly is detachably connected to the rotating mandrel via a locking nut. The rotating mandrel has a drill bit mounting hole, the drill bit mounting rod has a locking protrusion, and the rotating mandrel has a locking groove that matches the locking protrusion.

[0006] In one embodiment, an annular filter screen is provided at the connection end face between the drill bit mounting rod and the rotating mandrel, and the mesh diameter of the annular filter screen is smaller than the diameter of the liquid outlet.

[0007] In one embodiment, the locking nut is threadedly engaged with the rotating mandrel. When the locking nut is tightened, it presses against the drill bit mounting rod, thereby locking the drill bit assembly tightly onto the rotating mandrel.

[0008] In one embodiment, the contact surface between the drill bit mounting rod and the rotating mandrel is provided with a sealing ring to prevent leakage of the chemical solution.

[0009] In one embodiment, there are two liquid outlets, which are symmetrically arranged about the axial centerline of the drill bit.

[0010] In one embodiment, there are two locking protrusions and two locking slots.

[0011] The beneficial effects of this utility model are as follows:

[0012] This application discloses a drill bit for a tree trunk injection machine, comprising a drill bit assembly including a drill bit, a self-tapping threaded section, and a drill bit mounting rod. A liquid outlet is located at the connection between the drill bit and the self-tapping threaded section. Symmetrical arc-shaped protrusions are provided on both sides of the liquid outlet along the rotation direction of the drill bit to guide sawdust generated during drilling away from the sides of the liquid outlet. By providing these arc-shaped protrusions to guide sawdust to both sides, the unobstructed flow of the liquid outlet is ensured, allowing for continuous and stable injection of the medicine into the tree trunk, significantly reducing the occurrence of blockages, enabling continuous injection operations, lowering equipment maintenance costs, and improving overall work efficiency. The use of locking protrusions and locking grooves restricts the circumferential rotation of the drill bit assembly relative to the rotating mandrel, preventing rotation of the drill bit assembly and ensuring the stability and accuracy of drilling. A locking nut provides axial fixation, making the connection between the drill bit assembly and the rotating mandrel more secure and reliable, preventing loosening or detachment, and improving the safety of equipment operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the drill bit assembly structure;

[0014] Figure 2 for Figure 1 Enlarged view at point A;

[0015] Figure 3This is a schematic diagram of a rotating mandrel structure;

[0016] Explanation of symbols in the diagram:

[0017] 1. Drill bit assembly; 11. Drill bit; 12. Self-tapping threaded section; 13. Drill bit mounting rod; 14. Fluid outlet channel; 15. Locking protrusion;

[0018] 2. Liquid outlet; 21. Arc-shaped protrusion;

[0019] 3. Rotating mandrel; 31. Drill bit mounting hole; 32. Locking slot. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] like Figure 1 , 2 As shown, a drill bit for a tree trunk injection molding machine is provided with a drill bit assembly 1. The drill bit assembly 1 includes a drill bit 11, a self-tapping threaded section 12, and a drill bit mounting rod 13. The drill bit assembly 1 is provided with a liquid outlet channel 14. A liquid outlet 2 is provided at the connection between the drill bit 11 and the self-tapping threaded section 12. The liquid outlet 2 is provided with symmetrical arc-shaped protrusions 21 on both sides along the rotation direction of the drill bit 11, which are used to guide the sawdust generated by drilling to both sides of the liquid outlet 2.

[0023] Specifically, the drill assembly 1 consists of a drill bit 11, a self-tapping threaded section 12, and a drill bit mounting rod 13. The drill bit 11 is located at the front end of the drill assembly 1 and is used to drill injection holes in the tree trunk. The self-tapping threaded section 12 is connected to the drill bit 11, and its threaded structure helps the drill bit to drill and be fixed better inside the tree trunk. The drill bit mounting rod 13 is located at the rear end of the drill assembly 1 and is used to install the drill assembly 1 onto the tree trunk injection machine. Inside the drill assembly 1, there is a liquid outlet channel 14 to provide a path for the delivery of the liquid. The liquid outlet 2 is located at the connection between the drill bit 11 and the self-tapping threaded section 12 and is the outlet for the liquid to flow out and enter the tree trunk. Symmetrical arc-shaped protrusions 21 are provided on both sides of the liquid outlet 2 along the rotation direction of the drill bit 11 to guide away sawdust and prevent sawdust from entering the liquid outlet 2 during rotation and clogging it. When the trunk injection machine is started, the drill bit mounting rod 13 drives the entire drill bit assembly 1 to rotate at high speed. During this rotation, the drill bit 11 begins drilling into the trunk, with the self-tapping thread section 12 assisting the drill bit 11 to drill into the trunk more smoothly. Simultaneously, the injection solution enters the outlet channel 14 through the injection machine's pressurization system and flows out from the outlet 2, injecting into the trunk. During drilling, a large amount of sawdust is generated. Because arc-shaped protrusions 21 are provided on both sides of the outlet 2, these protrusions rotate along with the drill bit 11, guiding the sawdust generated during drilling away from both sides of the outlet 2, preventing sawdust accumulation and blockage. By setting the arc-shaped protrusions 21 to guide the sawdust to both sides, the outlet 2 remains unobstructed, allowing the injection solution to be continuously and stably injected into the trunk, greatly reducing the occurrence of blockages, enabling continuous injection operations, reducing equipment maintenance costs, and improving overall work efficiency. Figure 1 , 3 As shown, the drill bit assembly 1 is detachably connected to the rotating mandrel 3 via a locking nut. The rotating mandrel 3 is provided with a drill bit mounting hole 31, the drill bit mounting rod 13 is provided with a locking protrusion 15, and the rotating mandrel 3 is provided with a locking groove 32 that matches the locking protrusion 15.

[0024] Specifically, in this embodiment, there are two locking protrusions 15 and two locking slots 32, symmetrically arranged. When installing the drill bit assembly 1, simply align the locking protrusion 15 on the drill bit mounting rod 13 with the locking slot 32 of the rotating mandrel 3 for initial positioning, and then use a lock nut for axial fixation. This reduces installation difficulty and improves installation efficiency. The locking protrusion 15 and the locking slot 32 cooperate to restrict the circumferential rotation of the drill bit assembly 1 relative to the rotating mandrel 3, making it less likely for the drill bit assembly 1 to rotate, thus ensuring the stability and accuracy of drilling. The lock nut provides axial fixation, preventing displacement of the drill bit assembly 1 in the axial direction. The combined effect of these two elements makes the connection between the drill bit assembly 1 and the rotating mandrel 3 more stable and reliable, avoiding problems such as loosening or falling off, and improving the safety of equipment operation.

[0025] like Figure 1 , 3 As shown, an annular filter screen is provided at the connection end face of the drill bit mounting rod 13 and the rotating mandrel 3, and the mesh diameter of the annular filter screen is smaller than the diameter of the liquid outlet 2.

[0026] Specifically, an annular filter screen with a mesh diameter smaller than that of the liquid outlet 2 is installed at the connection end face between the drill bit mounting rod 13 and the rotating mandrel 3. This effectively prevents sawdust from entering during pressure relief and liquid return. The annular filter screen can intercept sawdust, ensuring smooth pressure relief and liquid return, and avoiding problems such as abnormal pressure and poor liquid return caused by blockage.

[0027] like Figure 1 , 3 As shown, the locking nut is connected to the rotating mandrel 3 by thread engagement. When the locking nut is tightened, it presses against the drill bit mounting rod 13, so that the drill bit assembly 1 is tightly locked in the rotating mandrel 3.

[0028] Specifically, the locking nut and the rotating mandrel 3 are connected by thread engagement. When the locking nut is tightened, it can press the drill bit mounting rod 13, so that the drill bit assembly 1 is tightly locked in the rotating mandrel 3. This can effectively prevent the drill bit assembly 1 from loosening or shifting on the rotating mandrel 3, ensuring stable rotation of the drill bit during trunk injection. The installation and removal of the drill bit assembly 1 can be easily achieved by rotating the locking nut, which facilitates the replacement of the drill bit assembly 1 and improves work efficiency.

[0029] like Figure 1 , 3 As shown, the contact surface between the drill bit mounting rod 13 and the rotating mandrel 3 is provided with a sealing ring to prevent leakage of the medicine.

[0030] Specifically, by setting a sealing ring, leakage of the medicine from the contact gap between the two can be effectively prevented, ensuring stable delivery of the medicine during the injection process and avoiding waste of the medicine.

[0031] like Figure 1 , 2 As shown, there are two liquid outlets 2, which are symmetrically arranged along the axial center line of the drill bit 11.

[0032] Specifically, in this embodiment, two liquid outlets 2 are provided. The symmetrical distribution of the two liquid outlets 2 allows the liquid to spread more evenly when injected into the tree trunk. The simultaneous operation of the two liquid outlets 2 increases the amount of liquid injected in the same amount of time, speeding up the injection process and improving work efficiency.

[0033] This application discloses a drill bit for a tree trunk injection machine, comprising a drill bit assembly 1. The drill bit assembly 1 includes a drill bit 11, a self-tapping threaded section 12, and a drill bit mounting rod 13. An outlet 2 is provided at the connection between the drill bit 11 and the self-tapping threaded section 12. The outlet 2 has symmetrically arranged arc-shaped protrusions 21 on both sides along the rotation direction of the drill bit 11, which guide sawdust generated during drilling to both sides of the outlet 2. By providing the arc-shaped protrusions 21 to guide the sawdust to both sides, the unobstructed flow of the outlet 2 is ensured, allowing the injection solution to be continuously and stably injected into the tree trunk. This significantly reduces the occurrence of blockages, enables continuous injection operations, lowers equipment maintenance costs, and improves overall work efficiency. By setting the locking protrusion 15 and the locking slot 32, the circumferential rotation of the drill bit assembly 1 relative to the rotating mandrel 3 is restricted, making it difficult for the drill bit assembly 1 to rotate and ensuring the stability and accuracy of drilling. By setting the locking nut for axial fixation, the connection between the drill bit assembly 1 and the rotating mandrel 3 is made more stable and reliable, avoiding problems such as loosening or falling off, and improving the safety of equipment operation.

[0034] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A drill bit for a tree trunk injection machine, comprising a drill bit assembly (1), the drill bit assembly (1) including a drill bit (11), a self-tapping threaded section (12) and a drill bit mounting rod (13), wherein the drill bit assembly (1) has a liquid outlet channel (14) and a liquid outlet (2) is provided at the connection between the drill bit (11) and the self-tapping threaded section (12), characterized in that, The outlet (2) is symmetrically provided with arc-shaped protrusions (21) on both sides along the rotation direction of the drill bit (11), which are used to guide the wood chips generated by drilling to both sides of the outlet (2).

2. The drill bit for a tree trunk injection molding machine according to claim 1, characterized in that, The drill bit assembly (1) is detachably connected to the rotating mandrel (3) by a locking nut. The rotating mandrel (3) is provided with a drill bit mounting hole (31). The drill bit mounting rod (13) is provided with a locking protrusion (15). The rotating mandrel (3) is provided with a locking groove (32) that matches the locking protrusion (15).

3. The drill bit for a tree trunk injection molding machine according to claim 2, characterized in that, An annular filter screen is provided at the connection end face between the drill bit mounting rod (13) and the rotating mandrel (3), and the mesh diameter of the annular filter screen is smaller than the diameter of the liquid outlet (2).

4. The drill bit for a tree trunk injection molding machine according to claim 2, characterized in that, The locking nut is connected to the rotating mandrel (3) by thread engagement. When the locking nut is tightened, it presses against the drill bit mounting rod (13), so that the drill bit assembly (1) is tightly locked in the rotating mandrel (3).

5. A drill bit for a tree trunk injection molding machine according to claim 2, characterized in that, The contact surface between the drill bit mounting rod (13) and the rotating mandrel (3) is provided with a sealing ring to prevent leakage of the medicine.

6. A drill bit for a tree trunk injection molding machine according to claim 1, characterized in that, The number of liquid outlets (2) is two, and they are symmetrically arranged with respect to the axial center line of the drill bit (11).

7. A drill bit for a tree trunk injection molding machine according to claim 2, characterized in that, The number of the locking protrusion (15) and the number of the locking slot (32) are both two.

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