An ice drill bit and ice drill

Abstract

The utility model discloses an ice drill cutter head and ice drill, aims at solving the problem of the big cutting resistance of existing ice drill, the blade easy wear and tear and the unstable operation. The ice drill cutter head includes the cutter head and at least two radiation fixed on the blade. The blade has the arc cutting edge that protrudes to the ice drilling direction, and its core improvement lies in: the outer angle alpha defined at any point P on the arc cutting edge is all greater than 90 DEG, the outer angle alpha is the angle that the tangent of the blade part and the rotating circumferential tangent form, opens away from the center and is towards the rotating direction, and the outer angle alpha is monotonously increasing from the inside end to the outside end of the cutting edge. This design makes the blade with "oblique cutting" instead of "straight cutting", and the increasing change of the outer angle is matched with the increasing of the linear velocity, and the stress of each point of the blade is effectively balanced, so that the ice breaking efficiency is greatly improved, the wear is reduced, and the running stability is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of ice-breaking equipment technology, specifically to an ice drill bit for drilling holes in ice and an ice drill containing the bit. Background Technology

[0002] Ice drills are commonly used ice-breaking tools in winter ice fishing, scientific research sampling, and other fields. They use a rotating shaft to drive a cutter head at one end to rotate, and use the blades to cut the ice layer. Existing ice drill heads typically include a cutter head and multiple blades evenly distributed along its circumference, with the blades having curved cutting edges.

[0003] During the cutting process, the motion of any point P on the cutting edge can be decomposed into the motion along the tangent direction of the cutting edge and the tangent direction of the rotating circumference. The angle formed by the tangent of the cutting edge and the tangent of the rotating circumference at point P, with the opening facing away from the center of the cutter head and towards the direction of rotation of the cutter head, is defined as the "external angle". Existing technology typically designs the external angle of the insert to be close to 90°, which makes the insert almost perpendicular to the ice layer for "straight cutting" or "chopping," resulting in huge cutting resistance and high power consumption. More importantly, due to the different linear velocities at different positions of the insert, from the inner side (near the center) to the outer side (far the center), the linear velocity gradually increases, and the cutting stress also increases accordingly. However, the traditional design keeps the external angle constant, which cannot adapt to this stress change. This causes the outer part of the insert to bear abnormally concentrated stress, which not only accelerates wear but also easily causes the cutting edge to break and the overall operation of the cutter head to be unstable, seriously affecting service life and drilling efficiency.

[0004] Therefore, there is an urgent need for an ice drill bit that can effectively reduce cutting resistance, balance the force on the cutting edge, and improve ice-breaking efficiency and stability. Summary of the Invention

[0005] (a) Technical problems to be solved In view of the shortcomings of the existing technology, this utility model aims to solve the following technical problems: 1. Existing ice drill bits suffer from high cutting resistance and high power consumption due to unreasonable outer angle design.

[0006] 2. Existing ice drill bits cannot adapt to changes in linear velocity due to their constant outer angle, resulting in stress concentration on the outer side of the blade, easy wear and chipping, and unstable operation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: An ice drill bit includes a cutter head and at least two blades fixed on the cutter head. The blades extend radially outward from the center of the cutter head and have an arc-shaped cutting edge protruding in the direction of ice drilling. At any point P of the arc-shaped cutting edge, a tangent to the cutting edge and a tangent to the circumference of the rotating circle passing through point P are drawn through point P. The angle formed by the intersection of the cutting edge tangent and the circumference tangent, which simultaneously satisfies the condition that the opening is away from the center of the cutter head and faces the direction of rotation of the cutter head, is defined as the exterior angle of point P. The geometry of the arc-shaped cutting edge is configured such that the exterior angle at any point on it is greater than 90°, and the exterior angle monotonically increases from the inner end to the outer end of the arc-shaped cutting edge.

[0008] Preferably, the value of the outer angle is in the range of 95°-170°.

[0009] Preferably, the outer angle increases from 95°-110° at the inner end to 140°-170° at the outer end.

[0010] Preferably, the number of blades is 2, 3 or 4, and they are evenly distributed along the periphery of the cutter head.

[0011] An ice drill includes a rotating shaft, the end of which is connected to an ice drill bit as described in any one of the above claims.

[0012] Compared with the prior art, the present invention has the following significant advantages: 1. Low cutting resistance and high ice-breaking efficiency: By setting the outer angle of each point on the cutting edge to be greater than 90°, the blade cuts into the ice layer at an angle, replacing the traditional vertical "chopping" method, which greatly reduces the frontal resistance during cutting. Practical experience has shown that this design can improve ice-breaking capacity by 30%-40% while reducing drive power consumption.

[0013] 2. Balanced stress, reduced wear, and extended lifespan: The unique design features an outer angle that monotonically increases from the inside to the outside of the cutting edge. This design cleverly matches the increasing linear velocity of the insert from the inside to the outside: a relatively small outer angle is used when the inner linear velocity is lower to ensure sufficient cutting power; a larger outer angle is used when the outer linear velocity is higher and the impact stress is greater, producing a more significant "beveled" effect, thus effectively dispersing and reducing contact stress. Ultimately, this results in a more uniform and smooth stress distribution across the entire cutting edge during the cutting process, avoiding stress concentration, significantly reducing edge wear and the risk of chipping, and extending the tool's lifespan.

[0014] 3. Stable operation and excellent user experience: Due to the uniform force on the blade, the vibration and impact of the cutter head during the rotating ice-breaking process are significantly reduced, resulting in smoother and more stable operation, which improves operating comfort and drilling quality. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the ice drill bit of this utility model; Figure 2 for Figure 1 A schematic diagram of the geometric relationship of a point P on a medium-arc cutting edge and a schematic diagram of the corresponding exterior angle α; Figure 3 This is a schematic diagram of the overall structure of the ice drill of this utility model.

[0016] In the figure, 1-cutter head, 2-blade, 21-arc cutting edge, m-cutting line of the cutting edge, n-tangent of the rotating circle, α-exterior angle. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0019] In the description of the embodiments of this utility model, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0020] Please see Figures 1-3This utility model provides a technical solution: an ice drill bit, including a cutter head 1 and at least two blades 2 fixed on the cutter head 1. The blades 2 extend radially outward from the center of the cutter head 1 and have an arc-shaped cutting edge 21 protruding in the direction of ice drilling. At any point P of the arc-shaped cutting edge 21, a tangent m to the cutting edge of the arc-shaped cutting edge 21 and a tangent n to the circumference of the rotating circle passing through point P are drawn through point P. The angle formed by the intersection of the cutting edge tangent m and the circumference tangent n, which simultaneously satisfies the condition that the opening is away from the center of the cutter head 1 and the opening is in the direction of rotation of the cutter head, is defined as the exterior angle α of point P. The geometry of the arc-shaped cutting edge 21 is configured such that the exterior angle α at any point on it is greater than 90°, and the exterior angle α monotonically increases from the inner end to the outer end of the arc-shaped cutting edge 21.

[0021] Please see Figure 2 In this embodiment, the value of the exterior angle α ranges from 95° to 170°.

[0022] Please see Figure 2 In this embodiment, the outer angle α increases from 95°-110° at the inner end to 140°-170° at the outer end.

[0023] Please see Figure 1 In this embodiment, the number of blades 2 is 2, 3 or 4, and they are evenly distributed along the periphery of the blade disc 1.

[0024] Please see Figure 3 This utility model provides a technical solution: an ice drill, including a rotating shaft, the end of which is connected to the ice drill head described in any one of the above-mentioned embodiments.

[0025] The working principle and usage process of this utility model are as follows: When the ice drill is started, the rotating shaft drives the cutter head to rotate, and the arc-shaped cutting edge 21 of the blade 2 begins to contact the ice surface. Since the external angle α of all points is greater than 90°, the blade cuts into the ice layer in a "slanted cutting" manner, just like "slicing" an object with a knife rather than "chopping" it in, effectively reducing the initial impact and resistance.

[0026] During the cutting process, the linear velocity of the inner part of the blade 2 is relatively low, but its outer angle α is relatively small, which still maintains a strong positive cutting force, ensuring smooth ice breaking. As the cutting progresses to the outer part of the blade 2, although the linear velocity increases sharply, causing the cutting stress to increase instinctively, the corresponding outer angle α has also increased to a large value (e.g., 140°-170°). The larger outer angle α makes the "oblique cutting" effect more obvious, effectively decomposing the original vertical impact force and partially converting it into a force that causes ice chips to slide backward along the blade edge, thereby significantly reducing the actual normal stress at that point.

[0027] This collaborative design, which pairs a smaller outer angle with a lower linear velocity region and a larger outer angle with a higher linear velocity region, allows the cutting edge to achieve a dynamic balance of forces from the inside to the outside. This results in a smooth cutting process with low resistance and high efficiency, while effectively protecting the cutting edge, especially the outer part under high load, and preventing premature wear and chipping caused by stress concentration.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ice drill bit, comprising a cutter head (1) and at least two blades (2) fixed on the cutter head (1), characterized in that: The blade (2) extends radially outward from the center of the cutter head (1) and has an arc-shaped cutting edge (21) protruding in the direction of ice drilling; at any point P of the arc-shaped cutting edge (21), the tangent (m) of the cutting edge (21) through point P and the tangent (n) of the rotating circle through point P are drawn; the angle formed by the intersection of the cutting edge tangent (m) and the rotating circle tangent (n), which simultaneously satisfies that the opening is away from the center of the cutter head (1) and the opening is in the direction of the cutting head rotation, is defined as the exterior angle (α) of point P; the geometry of the arc-shaped cutting edge (21) is configured such that the exterior angle (α) of any point on it is greater than 90°, and the exterior angle (α) increases monotonically from the inner end to the outer end of the arc-shaped cutting edge (21).

2. The ice drill bit according to claim 1, characterized in that, The value of the exterior angle (α) ranges from 95° to 170°.

3. The ice drill bit according to claim 2, characterized in that, The outer angle (α) increases from 95°-110° at the inner end to 140°-170° at the outer end.

4. The ice drill bit according to claim 1, characterized in that, The number of blades (2) is 2, 3 or 4, and they are evenly distributed along the periphery of the cutter head (1).

5. An ice drill, comprising a rotating shaft, characterized in that, The end of the rotating shaft is connected to an ice drill bit as described in any one of claims 1 to 4.

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