Saw chain with special-shaped cutting elements

Abstract

A saw chain with a special-shaped cutting element belongs to the technical field of saw chains and comprises a saw chain body formed by connecting a connecting chain plate, a transmission chain plate, special-shaped cutting teeth and a rivet, and each special-shaped cutting tooth comprises a connecting part located on the lower portion and used for being connected with the rivet, a limiting tooth located at the front end of the top of the connecting part and a cutter tooth structure located at the rear end of the top of the connecting part. The top face of the cutter tooth structure is formed by connecting a first inclined plane and a second inclined plane, the intersecting line between the first plane and the second plane forms a top face cutting edge, the front end of the top face cutting edge protrudes forwards and forms a first cutting-in point used for cutting in wood, the first plane is located on the side, facing the transmission chain plate, of the cutter tooth structure, and the second plane is located on the side, facing the transmission chain plate, of the cutter tooth structure. The second plane is located on the side away from the transmission chain plate. Cutting recoil can be effectively reduced, the reliability and stability during wood cutting are improved, and the tipping risk of the cutter tooth structure is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of saw chains, and in particular relates to a saw chain with special-shaped cutting elements. Background Art

[0002] In tree felling, the chainsaw accessory saw chain has a vital impact on the operating efficiency. The saw chain is generally composed of cutting elements, transmission elements, connecting chain plates and rivets. The cutting edge design of the cutting element has a very obvious impact on the cutting efficiency and cutting smoothness. Therefore, in order to ensure that the saw chain has high cutting efficiency, the cutting angle of the cutting element is generally optimized to improve the above-mentioned performance of the saw chain. However, traditional blade designs generally adopt right-angle blade type and rounded blade type designs. The above blade types have different performance advantages. The right-angle blade type has a fast cutting speed, but is prone to blunting and chipping. The rounded blade type design is not easy to chip and blunt, but the initial cutting speed is significantly slower than the right-angle blade type. At the same time, both cut into the wood gradually from the tip of the blade tooth, resulting in excessive lateral torque, causing the saw chain to swing and vibrate lateraly, especially when cutting hardwood. Summary of the Invention

[0003] The present invention discloses a saw chain with a special-shaped cutting element to solve the problems existing in the prior art described in the background technology part.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A saw chain with a special-shaped cutting element includes a saw chain body connected by a connecting chain plate, a transmission chain plate, special-shaped cutting teeth, and rivets. The special-shaped cutting teeth include a connecting part located at the bottom and connected to the rivet, a limiting tooth located at the front end of the top of the connecting part, and a knife tooth structure located at the rear end of the top of the connecting part. The top surface of the knife tooth structure is composed of an inclined plane 1 and an inclined plane 2. The intersection of plane 1 and plane 2 constitutes a top surface cutting edge. The front end of the top surface cutting edge protrudes forward and constitutes a first entry point for cutting into wood. Plane 1 is located on the side of the knife tooth structure facing the transmission chain plate, and plane 2 is located on the side away from the transmission chain plate.

[0006] Preferably, the front edge of plane one constitutes cutting edge one, and the angle between cutting edge one and the straight line parallel to the connecting portion constitutes ∠A; the front edge of plane two constitutes cutting edge two, and the angle between cutting edge two and the straight line parallel to the connecting portion constitutes ∠B, the degree of ∠B is between 50-72°, and the degree of ∠B is slightly larger than ∠A; when cutting wood, the first entry point cuts into the wood first, and cutting edge two cuts into the wood before the cutting edge, thereby avoiding the cutting recoil caused by the front end of the top surface of the tooth structure cutting into the wood at the same time.

[0007] Preferably, the side of plane 2 away from plane 1 is connected to a tooth side surface, and the tooth side surface is connected to the connecting portion through the tooth root surface. The angle between the tooth side surface and the straight line parallel to the connecting portion forms ∠C, and the degree range of ∠C is between 0.5-12°, thereby making the front end of the tooth side surface form an outward-facing side blade.

[0008] Preferably, the front end point of the side edge in the second plane opposite to the top cutting edge constitutes a second entry point, and when the second entry point cuts into the wood, the side blade begins to cut into the wood.

[0009] Preferably, the angle between the first plane and the second plane forms ∠D, and the angle range of ∠D is between 150° and 175°.

[0010] Preferably, the angle between the second plane and the side surface of the blade tooth forms ∠E, and the degree of ∠E is between 85° and 95°.

[0011] Preferably, the area where the top surface cutting edge is located is located between the two longitudinal planes where the left and right ends of the top of the limiting tooth are located, and the distance C between the left and right top surface cutting edges satisfies: 1 times the thickness of the transmission chain plate ≤ C ≤ 2 times the thickness of the transmission chain plate.

[0012] Preferably, the side cutting depth a of the tooth side of the tooth structure is between 0.04 and 0.15P, wherein P is the chain pitch.

[0013] The beneficial effects of the saw chain with special-shaped cutting elements of the present invention are:

[0014] (1) The present invention redesigns the tooth structure, sets cutting edge 1, cutting edge 2, side cutting edge, first cutting point, and second cutting point, wherein plane 1, plane 2, and side of the tooth constitute a multi-segment cutting surface. By optimizing the order in which each part of the tooth structure cuts into the wood and its own structure, it can effectively reduce the cutting backlash, improve the reliability and stability when cutting wood, and reduce the risk of chipping of the tooth structure. Through the above design, the adaptability of the present invention to complex working conditions is significantly enhanced. In particular, after chipping due to contact with a hard obstacle, it can still cut at high speed because there are other cutting edges and blades running, avoiding the problem of being unable to cut due to chipping.

[0015] (2) The present invention can adjust the cutting order of each cutting surface and cutting point by adjusting the height and position of the top cutting edge protrusion to meet the cutting requirements of various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the overall structure of the saw chain of the present invention;

[0017] Figure 2 : Schematic diagram of the side view of the special-shaped cutting teeth of the present invention;

[0018] Figure 3 : Schematic diagram of the top view of the special-shaped cutting teeth of the present invention;

[0019] Figure 4 : A schematic front view of the structure of the special-shaped cutting teeth of the present invention;

[0020] Figure 5 : Schematic diagram of the cutting point of the special-shaped cutting teeth of the present invention Figure 1 ;

[0021] Figure 6 : Schematic diagram of the cutting point of the special-shaped cutting teeth of the present invention Figure 2 ;

[0022] Figure 7 : Schematic diagram of the cutting surface of the special-shaped cutting teeth of the present invention Figure 1 ;

[0023] Figure 8 : Schematic diagram of the cutting surface of the special-shaped cutting teeth of the present invention Figure 2 ;

[0024] Figure 9 : Schematic diagram of the cutting surface of the special-shaped cutting teeth of the present invention Figure 3 .

[0025] Markings in the figure: 1. Special-shaped cutting tooth; 2. Connecting chain plate; 3. Rivet; 4. Transmission chain plate; 5. Tooth structure; 51. Top cutting edge; 52. Plane one; 53. Plane two; 54. Side surface of tooth; 55. Root surface of tooth; 6. Limiting tooth; 7. Connecting part; 8. First entry point; 9. Second entry point; 10. Wood; 11. Cutting edge two; 12. Cutting edge one; 13. Side blade; a: Side cutting depth, b: Height of the protrusion on the side of the limiting tooth, c: Distance between the left and right top cutting edges, d: Cutting depth, e: Thickness of the limiting tooth. DETAILED DESCRIPTION

[0026] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0027] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0028] In an initial embodiment, the present invention is a saw chain having profiled cutting elements, such as Figure 1As shown, it includes a saw chain body connected by a connecting chain plate 2, a transmission chain plate 4, a special-shaped cutting tooth 1, and a rivet 3. Adjacent transmission chain plates 2 are connected by two connecting chain plates 2 or a connecting chain plate 2 and a special-shaped cutting tooth 1. The rivet 3 passes through two connecting holes of the transmission chain plate 4 and is clearance-fitted with the transmission chain plate 4. The rivet 3 is interference-fitted with the connecting holes of the two connecting chain plates 2 on both sides of the transmission chain plate 4 or the connecting holes of the connecting chain plate 2 and the special-shaped cutting tooth 1. The connecting chain plate 2 and the special-shaped cutting tooth 1 are both provided with two connecting holes. The special-shaped cutting teeth 1 are staggered left and right and evenly distributed along the length direction of the saw chain.

[0029] In a further embodiment, Figure 2-4 As shown, the special-shaped cutting tooth 1 includes a connecting portion 7 located at the lower part and connected to the rivet 3, a limiting tooth 6 located at the front end of the top of the connecting portion 7, and a tooth structure 5 located at the rear end of the top of the connecting portion 7. The top surface of the tooth structure is composed of an inclined plane 1 52 and an inclined plane 2 53. The intersection of plane 1 and plane 2 constitutes a top surface cutting edge 51. The front end of the top surface cutting edge 51 protrudes forward and constitutes a first entry point 8 for cutting into the wood 10. The plane 1 52 is located on the side of the tooth structure facing the transmission chain plate 4, and the plane 2 53 is located on the side away from the transmission chain plate 4.

[0030] like Figure 2 、 3 As shown, the top surface of the tooth structure is different from the single plane design of the cutting teeth of conventional saw chains. The top surface of the tooth structure of the present invention is composed of two inclined planes intersecting each other, and the top surface forms a raised blade angle, that is, the top surface cutting edge. The front end of the top surface cutting edge protrudes forward and forms the first entry point 8 for cutting into the wood. This arrangement makes it easier for the tooth structure to cut into the wood (such as Figure 5-9 shown).

[0031] In a further embodiment, Figure 2-4 As shown, the front edge of the plane 1 52 constitutes the cutting edge 1, and the angle between the cutting edge 1 and the straight line parallel to the connecting portion 7 constitutes ∠A. The front edge of the plane 2 53 constitutes the cutting edge 2, and the angle between the cutting edge 2 and the straight line parallel to the connecting portion 7 constitutes ∠B. The degree of ∠B is between 50-72°, and the degree of ∠B is slightly larger than ∠A. The purpose of this design is to reduce the cutting backlash. The principle is: Figure 5 As shown, when cutting wood, the first entry point 8 cuts into the wood first, as shown in FIG. Figure 7 、 8 As shown, the second cutting edge 11 cuts into the wood before the first cutting edge 12, thereby avoiding the cutting backlash caused by the front end of the top surface of the tooth structure cutting into the wood at the same time.

[0032] In a further embodiment, Figure 2-4As shown, the side of the plane 2 53 away from the plane 1 52 is connected to the tooth side surface 54, and the tooth side surface 54 is connected to the connecting portion through the tooth root surface 55. The angle between the tooth side surface 54 and the straight line parallel to the connecting portion 7 forms ∠C, and the degree range of ∠C is between 0.5-12°, so that the front end of the tooth side surface 54 forms an outward-facing side blade 13.

[0033] like Figure 3 As shown, in order to reduce the cutting resistance on the side of the tooth structure 5, a side inclination angle ∠C is designed, and the angle range is within the range of 0.5-12°. The existence of this angle can make the side blade of the front end of the tooth structure spread outward, thereby making it easier to cut into the wood. It can also prevent the side of the tooth structure other than the blade from contacting the wood, thereby causing friction between the saw chain and the wood, increasing the cutting resistance, and reducing the cutting efficiency.

[0034] In a further embodiment, Figure 2-9 As shown, the front end point of the side edge in the second plane 53 opposite to the top cutting edge 51 constitutes the second entry point 9, and when the second entry point 9 cuts into the wood 10, the side blade begins to cut into the wood 10.

[0035] In a further embodiment, Figure 2-4 As shown, the included angle between the plane 1 52 and the plane 2 53 forms ∠D, and the angle range of ∠D is between 150° and 175°.

[0036] In order to ensure that the cutting tip at the top of the cutting tooth can cut into the wood more easily and avoid excessive resistance, ∠D is reasonably designed. Under the premise of ensuring the strength of the cutting tip, its angle range is between 150° and 175°.

[0037] In a further embodiment, Figure 2-4 As shown, the angle between the second plane 53 and the side surface 54 of the blade tooth forms ∠E, and the degree of ∠E is between 85° and 95°.

[0038] In order to improve the cutting sharpness, the angle ∠E between the side of the tooth structure and plane 2 is designed to be between 85° and 95°. While ensuring the front cutting efficiency, the side cutting quality is optimized to ensure a smooth cut surface.

[0039] In a further embodiment, Figure 2-4 As shown, the area where the top surface cutting edge 51 is located is located between the two longitudinal planes where the left and right ends of the top of the limiting tooth 6 are located (i.e. Figure 4 In the e area), the distance C between the top cutting edges 51 on the left and right sides satisfies: 1 times the thickness of the transmission chain plate 4 ≤ C ≤ 2 times the thickness of the transmission chain plate 4.

[0040] In order to avoid excessive resistance torque on both sides of the tooth structure during operation, which may cause cutting vibration, the distribution area of ​​the dividing line on the top surface of the tooth structure should be within the e area, and the distance C between the top surface cutting edges 51 on the left and right sides shall meet the requirement of: 1 times the thickness of the transmission chain plate 4 ≤ C ≤ 2 times the thickness of the transmission chain plate 4.

[0041] In a further embodiment, Figure 2-4 As shown, the side cutting depth a of the tooth side surface 54 of the tooth structure is between 0.04 and 0.15P, wherein P is the chain pitch.

[0042] In order to improve cutting efficiency and reduce cutting resistance, the side cutting depth a of the tooth structure should be designed between (0.04~0.15)P (P is the chain pitch).

[0043] Working principle of the present invention:

[0044] When the present invention is implemented in the cutting operation, Figure 5-9 As shown, the first entry point 8 cuts into the wood 10 first, and then the second cutting edge and the first cutting edge cut into the wood in succession, forming a double-edged cutting effect. After the second entry point 9 on the second plane 53 cuts into the wood 10, the side blade at the front end of the side of the tooth begins to cut into the wood, cutting off the wood fibers from the side. Therefore, under the joint action of the three cutting edges and the two entry points, the cutting stability and cutting rate of the saw chain are greatly improved.

Claims

1. A saw chain with special-shaped cutting elements, comprising a saw chain body connected by connecting chain plates, transmission chain plates, special-shaped cutting teeth, and rivets, characterized by: The special-shaped cutting teeth include a connecting part located at the bottom and connected to the rivet, a limiting tooth located at the front end of the top of the connecting part, and a knife tooth structure located at the rear end of the top of the connecting part. The top surface of the knife tooth structure is composed of an inclined plane one and an inclined plane two. The intersection line between plane one and plane two constitutes a top surface cutting edge. The front end of the top surface cutting edge protrudes forward and constitutes a first entry point for cutting into wood. Plane one is located on the side of the knife tooth structure facing the transmission chain plate, and plane two is located on the side away from the transmission chain plate.

2. A saw chain with a special-shaped cutting element according to claim 1, characterized in that: The front edge of plane one constitutes cutting edge one, and the angle between cutting edge one and the straight line parallel to the connecting portion constitutes ∠A. The front edge of plane two constitutes cutting edge two, and the angle between cutting edge two and the straight line parallel to the connecting portion constitutes ∠B. The degree of ∠B is between 50-72°, and the degree of ∠B is slightly larger than ∠A. When cutting wood, the first entry point cuts into the wood first, and then cutting edge two cuts into the wood before the cutting edge, thereby avoiding the cutting recoil caused by the front end of the top surface of the tooth structure cutting into the wood at the same time.

3. A saw chain with a special-shaped cutting element according to claim 2, characterized in that: The side of the plane 2 away from the plane 1 is connected to the side of the tooth, and the side of the tooth is connected to the connecting part through the root surface of the tooth. The angle between the side of the tooth and the straight line parallel to the connecting part forms ∠C, and the degree range of ∠C is between 0.5-12°, so that the front end of the side of the tooth forms an outward-facing side blade.

4. A saw chain with a special-shaped cutting element according to claim 3, characterized in that: The front end point of the side edge in the second plane opposite to the top cutting edge constitutes a second cutting point, and when the second cutting point cuts into the wood, the side blade begins to cut into the wood.

5. A saw chain with a special-shaped cutting element according to claim 4, characterized in that: The included angle between the plane 1 and the plane 2 forms ∠D, and the angle range of ∠D is between 150° and 175°.

6. A saw chain with a special-shaped cutting element according to claim 5, characterized in that: The angle between the second plane and the side surface of the blade tooth forms ∠E, and the degree of ∠E is between 85° and 95°.

7. A saw chain with a special-shaped cutting element according to claim 6, characterized in that: The area where the top surface cutting edge is located is located between the two longitudinal planes where the left and right ends of the top of the limiting tooth are located. The distance C between the left and right top surface cutting edges satisfies: 1 times the thickness of the transmission chain plate ≤ C ≤ 2 times the thickness of the transmission chain plate.

8. A saw chain with a special-shaped cutting element according to claim 7, characterized in that: The side cutting depth a of the tooth side of the tooth structure is between 0.04 and 0.15P, wherein P is the chain pitch.

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