Conical wood core sampler
By designing a conical wood core sampler, using a conical drill bit and a removable sleeve structure, the problem of hardwood sampling is solved and efficient and labor-saving wood core sampling is achieved.
Patent Information
- Application Number
- CN202510861256.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-25
- Publication Date
- 2025-08-15
AI Technical Summary
Existing wood core samplers are difficult to sample, especially in hardwood species, and the drill bit is difficult to remove from the trunk after sampling.
A conical wood core sampler is designed. The sampling drill bit is conical, with ridges on the outside and the through-trough is conical. The sampling sleeve is removably connected, and combined with the ejection assembly, providing progressive cutting and smooth passage.
It improves sampling efficiency, reduces initial wood-entry resistance, reduces the risk of sample damage, saves more effort on operation, and is suitable for field operations.
Smart Images
Figure CN120489620A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of analysis and sampling, in particular to a conical wood core sampler. Background Art
[0002] Trees need to be sampled and observed frequently to prevent some tree diseases. The existing tree sampling method is mostly drilling sampling. By drilling the core samples of the tree, without destroying the normal growth of the tree, the tree growth rate, tree age, tree growth firmness, nutrient migration and other related subjects can be analyzed and determined.
[0003] The existing wood core sampler includes a sampling drill bit and a hammering piece. The sampling front end of the sampling drill bit adopts a bullet-shaped design. When sampling, the hammering piece is struck to knock the sampling drill bit into the trunk of the tree for sampling. The above sampling method still has certain shortcomings. Because the sampling part is set to be bullet-shaped and has a smooth surface, it is difficult to damage wood fibers when sampling hardwood species, resulting in sampling difficulties. Moreover, after the sampling is completed, the sampling drill bit needs to be frequently rotated to remove the sampling drill bit from the trunk, which is inconvenient to use. Summary of the Invention
[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a conical wood core sampler for quickly sampling wood cores.
[0005] The present invention provides a conical wood core sampler, including a sampling drill bit, which is arranged in a frustum shape and has a first end and a second end. The diameter of the first end is larger than the diameter of the second end. The sampling drill bit is provided with a through groove along its length direction. A plurality of ridges are provided on the outside of the sampling drill bit, and the length direction of each ridge is consistent with the length direction of the sampling drill bit, and the plurality of ridges are evenly arranged along the circumference of the sampling drill bit. A sampling sleeve is connected to one end of the sampling drill bit. The sampling sleeve includes a barrel and a hammer block. The first end of the sampling drill bit is detachably connected to the barrel.
[0006] Preferably, the first end of the sampling drill bit is fixedly connected to a square seat, and the square seat is detachably connected to the cylinder.
[0007] Preferably, the through slot is tapered, and the inner diameter of the through slot increases sequentially from the first end to the second end, the port at the first end of the through slot is a rear tapered hole, and the port at the second end of the through slot is a front tapered hole.
[0008] Preferably, the sampling drill bit comprises several sections, adjacent sampling drill bits are threadedly connected, the ridges on each sampling drill bit segment are integrally formed with the corresponding sampling drill bit, and when several sections of the sampling drill bit are fully installed, adjacent ridges are located on the same straight line along the length direction of the sampling drill bit.
[0009] Preferably, the sampling sleeve also includes a flat-blade handle, a screw hole is provided on the cylinder body, the flat-blade handle is slidably arranged in the screw hole and slides through the cylinder body, the axis of the flat-blade handle is perpendicular to the axis of the cylinder body, a wood core groove is provided on the cylinder body, a square vertebral hole is provided on the cylinder body, the square seat is embedded in the square vertebral hole, the length of the wood core groove is greater than the length of the sampling drill bit, a wood core through hole is provided on the cylinder body, and the wood core through hole is connected to the through groove.
[0010] Preferably, it further includes an ejection assembly, which includes a handle and an ejector pin. A connecting sleeve is fixedly connected to the middle of the handle, and the ejector pin is inserted into the connecting sleeve. The axis of the ejector pin is perpendicular to the axis of the handle.
[0011] Preferably, the outer wall of the sampling drill bit close to the second end is a smooth outer wall.
[0012] Preferably, the number of the ridges is eight and they are evenly distributed along the circumference of the sampling drill bit.
[0013] Preferably, the sampling drill bit is made of die steel.
[0014] Compared to existing technologies, the present invention offers the following advantages: The sampling drill bit of the conical wood core sampler is designed as a frustum rather than a bullet, offering the advantage of progressive cutting: the frustum generates both axial and radial forces when entering the wood, more easily disrupting the wood fiber structure. Compared to the smooth surface of a traditional bullet-shaped drill bit, the conical design reduces initial penetration resistance, enabling the drill bit to penetrate hardwood faster and avoiding sampling failure or sample damage due to high wood density.
[0015] Secondly, the ridges are evenly distributed around the outside of the drill bit to form multiple cutting edges, which effectively increase friction and bite. The ridges tear wood fibers when struck, providing a sawtooth-like cutting effect, significantly improving sampling efficiency.
[0016] The through-slot provides a smooth passage for wood core samples, reducing the risk of sample jamming. The split design of the sampling sleeve, combined with a detachable connection, enhances modularity and operational flexibility. The hammer block applies the striking force, while the barrel firmly supports the drill bit. The overall structure requires only a small amount of rotation to remove the sample after sampling, making it more labor-saving and particularly suitable for field operations. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0018] Figure 2 This is a schematic diagram of the installation structure of the sampling drill bit and the sampling sleeve of the present invention.
[0019] Figure 3 This is a schematic structural diagram of the sampling drill bit of the present invention.
[0020] Figure 4 This is a schematic structural diagram of the sampling sleeve of the present invention from the first perspective.
[0021] Figure 5 This is a schematic structural diagram of the sampling sleeve of the present invention from a second viewing angle.
[0022] Figure 6 It is a schematic structural diagram of the ejection assembly of the present invention.
[0023] Figure 7 It is a schematic diagram of the changing structure of the through groove in the sampling drill bit of the present invention.
[0024] Explanation of the accompanying symbols: 1. Sampling drill bit; 2. Ridge; 3. Sampling sleeve; 31. Cylinder body; 32. Hammering block; 33. Slotted handle; 34. Twist hole; 35. Square conical hole; 36. Wood core through hole; 37. Wood core groove; 4. Front tapered hole; 5. Rear tapered hole; 6. Ejector assembly; 61. Holding handle; 62. Ejector pin; 63. Connecting sleeve; 7. Square seat. DETAILED DESCRIPTION
[0025] The following is combined with Figures 1 to 7 In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.
[0026] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Inside", "outside", "upper", "lower", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in the present invention are not drawn strictly according to the actual scale. The specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only structural schematic diagrams.
[0027] The present invention provides a conical wood core sampler, such as Figures 1 to 7 As shown, it includes a sampling drill bit 1, which is arranged in a frustum shape and has a first end and a second end. The diameter of the first end is larger than that of the second end. The sampling drill bit 1 is provided with a through groove along its length direction. A plurality of ridges 2 are provided on the outside of the sampling drill bit 1, and the length direction of each ridge 2 is consistent with the length direction of the sampling drill bit 1, and the plurality of ridges 2 are evenly arranged along the circumference of the sampling drill bit 1 and are fixedly connected to the outside of the sampling drill bit 1. A sampling sleeve 3 is connected to one end of the sampling drill bit 1. The sampling sleeve 3 includes a barrel 31 and a hammer block 32, and the first end is detachably connected to the barrel 31.
[0028] In this embodiment, the sampling drill bit 1 is designed as a frustum rather than a bullet, offering the advantage of progressive cutting: the frustum generates both axial and radial forces when entering the wood, making it easier to disrupt the wood fiber structure. Compared to the smooth surface of a traditional bullet, the conical design reduces initial penetration resistance, enabling the drill bit to penetrate hardwood faster and preventing sampling failure or sample damage due to high wood density.
[0029] Secondly, the ridges 2 are evenly distributed around the outside of the drill bit to form multiple cutting edges, which effectively increase friction and bite. The ridges 2 tear wood fibers when struck, providing a sawtooth-like cutting effect, significantly improving sampling efficiency.
[0030] The aperture of the through-hole of the present application changes in a curve. The through-hole length of the through-hole is 70mm, the diameter of the front cone hole is 4mm, and the diameter of the rear cone hole is 5mm. At 10mm from the front cone hole 5, the aperture design increases by 10% to 4.4mm, at 20mm from the front cone hole 5, it is 4.7mm, and at 30mm from the front cone hole 5, it is 4.7mm. The increase in aperture can effectively reduce the contact area between the sampling wood core and the hole wall, reducing frictional resistance, which is conducive to the smooth and damage-free ejection of the entire wood core by the ejector head 16.
[0031] The through-slot provides a smooth passage for wood core samples, reducing the risk of sample jamming. The sampling sleeve 3 features a split design with a detachable connection, enhancing modularity and operational flexibility. The hammer block 32 applies striking force, while the barrel 31 firmly supports the drill bit. The overall structure requires only a slight rotation after sampling for removal, making it more labor-saving and particularly suitable for field operations.
[0032] Preferably, Figures 1 to 3 As shown, the first end of the sampling drill bit 1 is fixedly connected to a square seat 7, and the square seat 7 is detachably connected to the cylinder 31.
[0033] In this embodiment, the square seat 7 serves as an intermediary component, fixed to the first end of the sampling drill bit 1. Its geometric shape provides an asymmetric force point, enhancing the mechanical lock with the barrel 31. This differs from a traditional direct threaded connection and effectively prevents accidental loosening during sampling. This is particularly true when sampling hardwood, where high vibrations are present. The square design absorbs vibration energy, reduces connection losses, and extends the life of the device. Removable connections, such as bolts or quick-release connectors, further optimize maintainability and portability: users can quickly remove the drill bit for cleaning or replacement, preventing corrosion from sample residue.
[0034] Preferably, if Figures 1 to 3 As shown, the through slot is tapered, and the inner diameter of the through slot increases from the first end to the second end. The port at the first end of the through slot is the rear tapered hole 5, and the port at the second end of the through slot is the front tapered hole 4.
[0035] In this embodiment, the channel is designed to be tapered, with a smaller front taper hole 4 and a larger rear taper hole 5, forming a natural guide funnel that guides the wood core sample smoothly from the smaller end to the first end during sampling. This prevents the sample from getting stuck in the middle of the channel, causing blockage or damage, especially during deep hole sampling.
[0036] At the same time, the tapered channel matches the shape of the frustum drill bit, producing a "wedge effect" when cutting into wood, reducing the rebound resistance of wood fibers and making sampling smoother.
[0037] On a technical level, the decreasing diameter design optimizes sample integrity: the small diameter end reduces cutting burrs and makes the wood core smoother, while the first end accommodates more bark tissue, making it suitable for needs such as annual ring analysis.
[0038] Preferably, if Figures 1 to 3 As shown, the sampling drill bit 1 includes several sections, and adjacent sampling drill bits 1 are threadedly connected. The ridges 2 on each segment of the sampling drill bit 1 are integrally formed with the corresponding sampling drill bit 1, and when several sections of the sampling drill bit 1 are fully installed, the adjacent ridges 2 along the length direction of the sampling drill bit 1 are located on the same straight line.
[0039] In this embodiment, the segmented design of the sampling drill bit 1 facilitates the detachable transportation of the sampling drill bit 1 , and reduces its volume by 50%, making it suitable for sampling environments with complex terrain (such as mountains or rainforests).
[0040] The threaded connection ensures the stability of the assembly and avoids loosening during sampling; the ridge 2 is integrally formed and precisely positioned to create a continuous cutting surface. The continuous ridge 2 enhances the sawing action, destroying the wood fibers in hardwood more thoroughly and reducing the need for repeated hammering.
[0041] The integrated ridge 2 manufacturing method improves structural strength and prevents breakage, while segmented assembly simplifies maintenance, requiring only damaged segments to be replaced. In practical applications, the combination with a frustum drill bit expands the device's applicability. For example, the drill bit length can be adjusted based on tree diameter, reducing overall sampling time by 30%. Economically, this design reduces production and replacement costs, while also reducing energy consumption, enabling lightweight, highly efficient sampling.
[0042] Preferably, if Figures 1 to 5 As shown, the sampling sleeve 3 also includes a flat handle 33, a screw hole 34 is provided on the barrel 31, the flat handle 33 is slidably arranged in the screw hole 34 and slides through the barrel 31, the axis of the flat handle 33 is perpendicular to the axis of the barrel 31, a wood core groove 37 is provided on the barrel 31, a square vertebral hole 35 is provided on the barrel 31, the square seat 7 is embedded in the square vertebral hole 35, the length of the wood core groove 37 is greater than the length of the sampling drill bit 1, and a wood core through hole 36 is provided on the barrel 31, which is connected to the through groove.
[0043] In this embodiment, the flat-head screw handle 33 is slidably arranged through the screw hole 34 to provide a lever force point: the screw handle is perpendicular to the axis of the cylinder 31, which is convenient for the operator to hold and tighten it, apply torque to remove the sampling drill bit 1, and can help stabilize the equipment and reduce shaking during sampling.
[0044] The wood core slot 37 is longer than the sampling drill bit 1, providing redundant space for the sample to avoid deformation. The wood core through-hole 36 connects to the through-slot, allowing for quick inspection or transfer of samples without complete disassembly of the equipment, improving workflow continuity. The threaded square seat 7 ensures efficient disassembly.
[0045] Preferably, if Figure 4~Figure 5 As shown, the hammering block 32 is configured to be circular and solid.
[0046] In this embodiment, the circular design of the hammering block 32 provides a uniform force-bearing surface, which disperses the impact force during hammering, reduces stress concentration, and prevents local deformation; the use of high-density steel solid setting increases the weight, ensuring that the force is efficiently transmitted to the drill bit without the need for repeated hammering.
[0047] In this embodiment, the rounded profile also improves operational safety: the absence of sharp edges reduces the risk of cuts, and it is easy to hold, reducing fatigue during long-term use in the field; in addition, the solid structure is corrosion-resistant and wear-resistant, extending the lifespan by 20%.
[0048] Preferably, if Figure 6 As shown, it also includes an ejection assembly 6, which includes a handle 61 and an ejector pin 62. A connecting sleeve 63 is fixedly connected to the middle position of the handle 61, and the ejector pin 62 is inserted into the connecting sleeve 63. The axis of the ejector pin 62 is perpendicular to the axis of the handle 61.
[0049] In this embodiment, the handle 61 provides a comfortable grip, with its axis perpendicular to the ejector pin 62, facilitating two-handed operation. This allows for even force when removing the wood core, reducing the risk of sample fragmentation. The ejector assembly 6, in conjunction with the wood core groove 37, allows for rapid sample removal without the need for repeated drill bit rotation, significantly improving efficiency. The pointed tip of the ejector pin 62 prevents damage to the wood core's growth ring structure, particularly when sampling deep holes or hardwoods.
[0050] Preferably, the sampling drill bit 1 is made of die steel.
[0051] In this embodiment, the sampling drill bit 1 is made of die steel. Due to its high hardness and toughness, die steel is less likely to curl or crack when cutting into hardwood. Combined with the tapered channel design, the ridges 2 remain sharp even after repeated cuts. Die steel is corrosion-resistant, extending the life of the drill bit by 30% and reducing the frequency of replacement.
[0052] Preferably, the outer wall of the sampling drill bit 1 near the second end is a smooth outer wall, and the number of ridges 2 is eight and evenly distributed along the circumference of the sampling drill bit 1 .
[0053] In this embodiment, the front end of the sampling drill bit 1 is not completely wrapped with ridges 2. This is because the thickness of the outer bark of the tree trunk is taken into consideration. The bark part is soft and can be easily drilled in without the ridges 2. After drilling in, the bark part plays a role in fixing the sampling drill bit 1 to a certain extent, making it convenient to further hammer in the sampling drill bit 1; the ridges 2 are set to eight, which destroy the wood fibers to facilitate hammering in and pulling out; and they reinforce the outer wall of the drill bit to prevent the drill bit from deforming and bending when hammering into hardwood. In order to reduce damage to the sampled trees, the drill bit diameter is controlled at about 5 mm. In the absence of the ridges 8 during the experiment, the sampling drill bit 1 is more likely to bend. Experiments have shown that the eight ridges 2 can not only maintain the strength of the sampling drill bit 1, but also destroy the wood fibers to facilitate hammering in and pulling out the sampling drill bit 1.
[0054] The method of using the conical wood core sampler of the present invention is as follows: The first step is to install the square seat 7 into the square tapered hole of the sampling sleeve 3. The staff holds the sampling sleeve 3 tightly with his left hand and aligns it vertically with the sampling trunk. He uses a hammer with his right hand to hit the hammer block 32 and uses an octagonal hole cone to chisel into the trunk.
[0055] Step 2: Insert the flat handle 33 into the handle hole, rotate the sampling sleeve 3, and rotate the sampling drill bit 1 in the trunk. This can use the ridge 2 to expand the diameter of the hole in the trunk, so that the sampling drill bit 1 can be easily pulled out.
[0056] Step 3: Hold the handle 61 tightly with your left hand, align it with the front tapered hole of the sampling drill bit 1, hold the sampling sleeve 3 tightly with your right hand, and push the handle 61 with your left hand. This will cause the ejector pin 62 to push out the sampled wood core from the sampling drill bit 1, and finally pass through the rear tapered hole 5 and the wood core through hole 36 and into the wood core groove 37, completing the wood core sampling.
[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A conical wood core sampler, characterized in that: include: The sampling drill bit (1) is configured in a frustum shape and has a first end and a second end, wherein the diameter of the first end is larger than that of the second end, and the sampling drill bit (1) is provided with a through groove along its length direction; A plurality of ridges (2) are provided, and the length direction of each ridge (2) is consistent with the length direction of the sampling drill bit (1), and the plurality of ridges (2) are evenly arranged along the circumference of the sampling drill bit (1); The sampling sleeve (3) comprises a barrel (31) and a hammering block (32), and the first end of the sampling drill bit (1) is detachably connected to the barrel (31).
2. A conical wood core sampler as claimed in claim 1, characterized in that: The first end is fixedly connected to a square seat (7), and the square seat (7) is detachably connected to the cylinder (31).
3. A conical wood core sampler as claimed in claim 1, characterized in that: The through-through slot is tapered, and the inner diameter of the through-through slot increases sequentially from the first end to the second end. The port at the first end of the through-through slot is a rear tapered hole (5), and the port at the second end of the through-through slot is a front tapered hole (4).
4. A conical wood core sampler as claimed in claim 2, characterized in that: The sampling sleeve (3) further comprises a flat handle (33), a screw hole (34) is provided on the cylinder (31), the flat handle (33) is slidably arranged in the screw hole (34) and slides through the cylinder (31), the axis of the flat handle (33) is perpendicular to the axis of the cylinder (31), a wood core groove (37) is provided on the cylinder (31), a square vertebral hole (35) is provided on the cylinder (31), the square seat (7) is embedded in the square vertebral hole (35), the length of the wood core groove (37) is greater than the length of the sampling drill bit (1), the cylinder (31) is provided with a wood core through hole (36), and the wood core through hole (36) is communicated with the through groove.
5. A conical wood core sampler as claimed in claim 1, characterized in that: The device further comprises an ejection assembly (6), wherein the ejection assembly (6) comprises a holding handle (61) and an ejector pin (62), wherein a connecting sleeve (63) is fixedly connected to the middle portion of the holding handle (61), and the ejector pin (62) is inserted into the connecting sleeve (63), and an axis of the ejector pin (62) is perpendicular to an axis of the holding handle (61).
6. A conical wood core sampler as claimed in claim 3, characterized in that: The sampling drill bit (1) is made of die steel.
7. A conical wood core sampler as claimed in claim 1, characterized in that: The outer wall of the sampling drill bit (1) close to the second end is a smooth outer wall.
8. A conical wood core sampler as claimed in claim 2, characterized in that: The ridges (2) are arranged in eight pieces and are evenly distributed along the circumference of the sampling drill bit (1).