High-efficiency saw chain and cutting blade thereof

Abstract

Pin shaft holes are formed in the middle of a connecting base portion of the cutting blade at intervals, a depth limiting portion, a cutting concave portion and a cutting concave portion of a cutting portion are sequentially arranged on the upper portion of the connecting base portion from front to back, the cutting portion is of an L-shaped structure, and a transmission protrusion is arranged on the lower portion of the connecting base portion. And the outer side edge of the upper tangent plane exceeds the central line of the thickness of the connecting base part and does not exceed the overall thickness. The high-efficiency saw chain comprises the cutting blades, connecting pieces and pin shafts, the cutting blades are divided into left cutting knives and right cutting knives according to the orientation of outer tangent planes, the left cutting knives and the right cutting knives are arranged in a staggered mode and connected through the connecting pieces and the pin shafts to form the whole annular saw chain, and at the moment, the left cutting knives, the middle guide teeth and the right cutting knives are arranged in the middle. The connecting pieces are located on two sides. According to the utility model, the stress point is centered during cutting, the resistance during cutting is reduced, and the endurance time of the lithium battery and the gasoline engine is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to a saw chain, in particular to a high-efficiency saw chain and a cutting blade thereof. Background Art

[0002] The saw chain is a portable saw powered by a lithium battery or a gasoline engine. It is mainly used for logging and timber making. Its working principle is to perform shearing by the lateral movement of the staggered L-shaped blades on the saw chain. The blades are staggered on the saw chain. The distance between the outer cut surfaces of the staggered blades is the maximum gap for cutting. When cutting, the upper cut surfaces of the staggered blades need to cut off the wood where the gap is located. The upper cut surfaces of the staggered blades will overlap within the width of the gap.

[0003] Authorization announcement number CN 215202400U discloses a high-efficiency saw chain, including multiple transmission plates, multiple rebound transmission plates, multiple cutting knives, multiple connecting plates and multiple pins; multiple transmission plates 1 are arranged at intervals, and only one rebound transmission plate 2 is arranged between any two adjacent transmission plates 1, multiple transmission plates 1 and multiple rebound transmission plates 2 are in the same plane, and connecting plates 4 are arranged at the joints between transmission plates 1 and adjacent rebound transmission plates 2, and connecting plates 4 are located on one side of the plane where transmission plates 1 and rebound transmission plates 2 are located, and connecting plates 4 are hinged to transmission plates 1 and rebound transmission plates 2 through pins 5; multiple cutting knives 3 are arranged at intervals, and any two adjacent cutting knives 3 are located on both sides of the plane where transmission plates 1 and rebound transmission plates 2 are located, and any two adjacent cutting knives 3 are symmetrically structured, and cutting knives 3 correspond to connecting plates 4 and are hinged to the pins 5 of connecting plates 4, and two adjacent connecting plates 4 are not connected to cutting knives 3 at the same time. The utility model effectively reduces the energy consumption of saw chains and effectively prolongs the endurance of lithium batteries or gasoline engines.

[0004] However, the above technical solution has the following shortcomings: 1. A transmission plate 1 and a rebound transmission plate 2 are provided between two adjacent cutting knives, and the two are connected by a connecting plate, thereby increasing the length of a single section of the saw chain and affecting the sawing efficiency. 2. Two adjacent cutting knives 3 are located on both sides of the plane where the transmission plate 1 and the rebound transmission plate 2 are located, which is equivalent to an offset, affecting the cutting stability. 3. The outer end of the upper L-shaped curved portion of the cutting knives 3 needs to exceed the connecting base 31 and the transmission plate, increasing the manufacturing cost. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a high-efficiency saw chain and a cutting blade thereof which are reasonably designed, centrally arranged and have high sawing efficiency.

[0006] The technical solution of the utility model is:

[0007] A cutting blade for a saw chain comprises a connecting base, wherein the middle of the connecting base is provided with pin holes at intervals, a cutting recess is provided in the middle of the upper part of the connecting base, the front and rear sides of the cutting recess are respectively a depth limiting part and a cutting part, the cutting part has an outer cutting surface and an upper cutting surface, a transmission protrusion is provided at the lower part of the connecting base, when installed, the connecting base and the middle guide tooth of the saw chain are in the same plane, and both sides are connected by a connecting piece and a pin respectively.

[0008] Furthermore: the inner edge of the upper cut surface exceeds the center line of the thickness of the connecting base and does not exceed the overall thickness of the connecting base, and the outer edge of the upper cut surface exceeds the outer end of the pin shaft.

[0009] Furthermore: the upper cutting surface is an inclined surface which is higher at the front and lower at the back, the outer cutting surface is an inclined surface which is higher at the top and lower at the bottom, and the intersection of the upper cutting surface and the outer cutting surface is a knife edge.

[0010] Furthermore: the cutting portion is an L-shaped structure.

[0011] Furthermore: there are two pin holes, and the center distance between them is T1=7.1±2mm; the distance between the horizontal center line of the pin hole and the lower edge of the connecting base is C2=6.5±1mm; the distance between the horizontal center line of the pin hole and the upper edge of the connecting base is C1=6.0±1mm; the distance between the external section and the connecting base is A=2.8±0.5mm.

[0012] Furthermore: the depth limiting portion deviates from the center line and is inclined toward the side of the circumscribed surface.

[0013] A high-efficiency saw chain using the cutting blade also includes the connecting piece and the pin shaft, the cutting blade is divided into a left cutting blade and a right cutting blade according to the orientation of the external cut surface, the left cutting blade and the right cutting blade are arranged alternately, wherein a front pin shaft hole of the left cutting blade is connected to a rear pin shaft hole of a middle guide tooth through the connecting piece and the pin shaft, the front pin shaft hole of the middle guide tooth is connected to a rear pin shaft hole of the right cutting blade through the connecting piece and the pin shaft, the front pin shaft hole of the right cutting blade is connected to the rear pin shaft hole of the next middle guide tooth through the connecting piece and the pin shaft, the front pin shaft hole of the middle guide tooth is connected to the rear pin shaft hole of the next left cutting blade through the connecting piece and the pin shaft, and so on, to form a whole ring-shaped saw chain; the left cutting blade 1, the middle guide tooth and the right cutting blade are located on the same plane in the center, and the connecting piece is located on both sides of the left cutting blade, the middle guide tooth and the right cutting blade respectively.

[0014] Furthermore, the distance between the outer cutting surfaces of the left cutting knife and the right cutting knife is the maximum gap of the cutting, and the upper cutting surfaces of the left cutting knife and the right cutting knife may overlap within the width of the gap.

[0015] Furthermore, two pin holes are arranged at intervals in the middle of the middle guide tooth, a transmission protrusion is arranged at the lower part of the middle guide tooth, and a second protrusion is arranged at the upper part of the middle guide tooth.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model combines the middle guide tooth and the cutting knife of the traditional structure into one, so that the force point is centered during cutting, the resistance during cutting is reduced, and the endurance of the lithium battery and the gasoline engine is effectively extended.

[0018] 2. The utility model is centrally arranged, the cutting blade and the middle guide tooth are in the same plane, and the two sides are connected by a connecting plate to improve the stability of the overall structure.

[0019] 3. The outer side edge of the cut surface of the cutting knife of the utility model exceeds the center line of the thickness of the connecting base and does not exceed the overall thickness of the connecting base. The overall structure is compact and the processing cost is reduced.

[0020] 4. The upper cutting surface and the outer cutting surface of the utility model are both inclined surfaces, which are convenient for chip removal, reduce blockage during sawing, are not easy to generate heat, and reduce energy consumption.

[0021] 5. The utility model has reasonable design, compact connection and high sawing efficiency, reduces the length of the saw chain unit, improves the sawing efficiency, is easy to promote and implement, and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a high-efficiency saw chain;

[0023] Figure 2 for Figure 1 A top view of the high efficiency saw chain shown;

[0024] Figure 3 for Figure 1 A side view of the high efficiency saw chain shown;

[0025] Figure 4 for Figure 1 The structural diagram of the cutting knife on the middle left;

[0026] Figure 5 for Figure 4 The three-dimensional structural schematic diagram of the left cutting knife shown;

[0027] Figure 6 for Figure 1 The structural diagram of the cutting knife in the middle right;

[0028] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure of the right cutting knife shown;

[0029] Figure 8 for Figure 1 Dimensional drawing of the right cutting knife;

[0030] Fig. 9 for Figure 8 Side view of the right cutting knife. DETAILED DESCRIPTION

[0031] Example 1: See Figure 1 -- Fig. 9 , in the figure, 1-left cutting knife, 2-middle guide tooth, 3-right cutting knife, 4-pin shaft, 5-connecting plate, 6-connecting base, 7-pin shaft hole, 8-outer section, 9-transmission protrusion, 10-upper section, 11-cutting recess, 12-depth limiting part.

[0032] A cutting blade for a saw chain comprises a connecting base 6, wherein the middle of the connecting base 6 is provided with pin holes 7 at intervals, wherein the number of the pin holes 7 is two, a cutting recess 11 is provided in the middle of the upper part of the connecting base 6, and the front and rear sides of the cutting recess 11 are respectively a depth limiting part 12 and a cutting part (the forward cutting direction is the front, and the reverse direction is the rear), wherein the cutting part has an outer cutting surface 8 and an upper cutting surface 10, wherein: a transmission protrusion 9 is provided at the lower part of the connecting base 6 (this structure integrates the middle guide tooth and the cutting blade of the traditional structure into one).

[0033] Preferred solution: the inner edge of the upper cutting surface 10 exceeds the center line of the thickness of the connecting base 6 and does not exceed the overall thickness of the connecting base 6. Of course, it can also exceed the overall thickness, but it will only cause cost waste. The outer edge of the upper cutting surface 10 exceeds the outer end of the pin 4 to avoid the slit being smaller than the length of the pin 4 and being unable to cut. The upper cutting surface 10 is a slope with a high front and a low back, and the outer cutting surface 8 is a slope with a high top and a low bottom. The intersection of the upper cutting surface 10 and the outer cutting surface 8 is a knife edge.

[0034] Optimal solution: the cutting portion is an L-shaped structure.

[0035] Optimal solution: the center distance between the two pin holes 7 is T1=7.1±2mm; the distance between the horizontal center line of the pin hole 7 and the lower edge of the connecting base 6 is C2=6.5±1mm; the distance between the horizontal center line of the pin hole and the upper edge of the connecting base 6 is C1=6.0±1mm; the distance between the circumferential surface 8 and the connecting base 6 is A=2.8±0.5mm.

[0036] Preferably, the depth limiting portion 12 deviates from the center line and is inclined toward the circumscribed surface 8 .

[0037] During installation and use, the connection base and the middle guide tooth of the saw chain are located in the same plane, and both sides are connected by connecting plates and pin shafts respectively.

[0038] Embodiment 2: This embodiment is basically the same as the embodiment 1, and the similarities are not repeated. The difference is that the high-efficiency saw chain further includes a connecting piece 5 and a pin 4, wherein the saw chain cutting blade is divided into a left cutting blade 1 and a right cutting blade 3 according to the orientation of the outer cutting surface 10, and the adjacent left cutting blades 1 and right cutting blades 3 are arranged alternately, wherein the front pin hole of a left cutting blade 1 is connected to the rear pin hole of a middle guide tooth 2 through the connecting piece 5 and the pin 4, and the front pin hole of the middle guide tooth 2 is connected to the rear pin hole of the middle guide tooth 2 through the connecting piece 5 and the pin 4 is connected to the rear pin hole of a right cutting knife 3, the front pin hole of the right cutting knife 3 is connected to the rear pin hole of the next middle guide tooth 2 through the connecting piece 5 and the pin 4, the front pin hole of the middle guide tooth 2 is connected to the rear pin hole of the next left cutting knife 1 through the connecting piece 5 and the pin 4, and so on, forming a whole ring-shaped saw chain. At this time, the left cutting knife 1, the middle guide tooth 2 and the right cutting knife 3 are located on the same plane in the center, and the connecting piece 5 is located on both sides of the left cutting knife 1, the middle guide tooth 2 and the right cutting knife 3 respectively.

[0039] Optimal solution: two pin holes are arranged at intervals in the middle of the middle guide tooth 2 , a transmission protrusion is arranged at the lower part of the middle guide tooth 2 , and a second protrusion is arranged at the upper part of the middle guide tooth 2 .

[0040] Preferably, any two adjacent left cutting knives 1 and right cutting knives 3 have a bilaterally symmetrical structure. During cutting, the distance between the outer cutting surfaces 10 of the left cutting knife 1 and the right cutting knife 3 is the maximum cutting gap. The upper cutting surfaces 8 of the left cutting knife 1 and the right cutting knife 3 will overlap within the width of the gap to facilitate the formation of a complete cutting surface.

[0041] In addition, the connection base 6 of the cutting blade is centrally arranged so that the force point is centered during cutting, thereby reducing the resistance during cutting and effectively extending the battery life of the lithium battery and the gasoline engine.

[0042] On the premise of meeting the technical features of the above-mentioned schemes, the middle guide teeth, pin shaft, and connecting plate can also adopt structures corresponding to existing saw chains (such as "Cutting teeth for saw chains" with application publication number CN 104708676A and "A high-efficiency saw chain" with authorization announcement number CN215202400U), and the outer cutting surface 8, upper cutting surface 10, depth limiting portion 12 and cutting edge can also adopt structures corresponding to existing saw chains.

[0043] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification made according to the technical essence of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. A cutting blade of a saw chain, comprising a connecting base (6), wherein the middle of the connecting base (6) is provided with pin holes (7) at intervals, wherein: A cutting recess (11) is provided in the middle of the upper part of the connection base (6), and the front and rear sides of the cutting recess (11) are respectively a depth limiting part (12) and a cutting part, and the cutting part has an outer cutting surface (8) and an upper cutting surface (10). A transmission protrusion (9) is provided at the lower part of the connection base (6). When installed, the connection base (6) and the middle guide tooth (2) of the saw chain are located in the same plane, and both sides are connected by a connecting piece (5) and a pin shaft (4).

2. The cutting blade of a saw chain according to claim 1, characterized in that: The inner edge of the upper cut surface (10) exceeds the center line of the thickness of the connecting base (6) and does not exceed the overall thickness of the connecting base (6), and the outer edge of the upper cut surface (10) exceeds the outer end of the pin shaft (4).

3. The cutting blade of a saw chain according to claim 1, characterized in that: The upper cutting surface (10) is an inclined surface that is higher at the front and lower at the back, and the outer cutting surface (8) is an inclined surface that is higher at the top and lower at the bottom. The intersection of the upper cutting surface (10) and the outer cutting surface (8) is a knife edge.

4. The cutting blade of a saw chain according to claim 1, characterized in that: The cutting portion is an L-shaped structure.

5. The cutting blade of a saw chain according to claim 1, characterized in that: There are two pin holes (7), and the center distance T1 is 7.1±2 mm; the distance C2 between the horizontal center line of the pin hole (7) and the lower edge of the connecting base (6) is 6.5±1 mm; the distance C1 between the horizontal center line of the pin hole (7) and the upper edge of the connecting base (6) is 6.0±1 mm; the distance A between the external section and the connecting base (6) is 2.8±0.5 mm.

6. The cutting blade of a saw chain according to claim 1, characterized in that: The depth limiting portion (12) deviates from the center line and is inclined toward the side of the circumscribed surface (8).

7. A high-efficiency saw chain using the cutting blade according to any one of claims 1 to 6, comprising the connecting piece (5) and the pin (4), characterized in that: The cutting blade is divided into a left cutting blade (1) and a right cutting blade (3) according to the orientation of the outer cutting surface (8). The left cutting blade (1) and the right cutting blade (3) are arranged alternately, wherein a front pin hole of the left cutting blade (1) is connected to a rear pin hole of a middle guide tooth (2) through the connecting plate (5) and the pin (4), and the front pin hole of the middle guide tooth (2) is connected to a rear pin hole of the right cutting blade (3) through the connecting plate (5) and the pin (4). The connecting piece (5) and the pin shaft (4) are connected to the rear pin shaft hole of the next middle guide tooth (2); the front pin shaft hole of the middle guide tooth (2) is connected to the rear pin shaft hole of the next left cutting knife (1) through the connecting piece (5) and the pin shaft (4); and so on, forming a whole ring-shaped saw chain; the left cutting knife (1), the middle guide tooth (2) and the right cutting knife (3) are located on the same plane in the middle, and the connecting piece (5) is located on both sides of the left cutting knife (1), the middle guide tooth (2) and the right cutting knife (3) respectively.

8. A high efficiency saw chain according to claim 7, characterized in that: The distance between the outer cutting surfaces of the left cutting knife (1) and the right cutting knife (3) is the maximum cutting gap, and the upper cutting surfaces of the left cutting knife (1) and the right cutting knife (3) overlap within the width of the gap.

9. The high-efficiency saw chain according to claim 7, characterized in that: Two pin holes are arranged at intervals in the middle of the middle guide tooth (2), a transmission protrusion is arranged at the lower part of the middle guide tooth, and a second protrusion is arranged at the upper part of the middle guide tooth.

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