Multi-cutter-type arrangement combined saw chain and design method

Abstract

The invention belongs to the technical field of saw chains, and particularly relates to a multi-cutter-type arrangement combined type saw chain and a design method.The multi-cutter-type arrangement combined type saw chain comprises a saw chain body, a plurality of cutting elements are arranged on the saw chain body and are arranged according to a set sequence, and the cutting elements are arranged on the saw chain body. And the cutting mechanism compatible with various using objects is combined. According to the multi-cutting-element combined saw chain, the mode that multiple cutting elements are combined is adopted, the advantages of the multiple cutting elements are integrated into one saw chain, the use requirements of various working conditions are met, and the defect that a traditional saw chain cannot give consideration to high sharpness, high applicability, high reliability and the like is overcome.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of saw chain, and particularly relates to a multi-cutter type arrangement and combination type saw chain and a design method. BACKGROUND

[0002] Tree felling operations often have to face various complex felling environments. For example, in the same felling operation process, different tree species such as hardwood, softwood or soft and hard trees need to be felled. For different tree species, using different cutter types of saw chains is more targeted. For example, for hardwood, a round corner cutter type is usually selected, which can reduce the probability of chipping and prolong the sharpness retention period, but selecting a round corner saw chain often causes the cutting rate to slow down and the working time to be longer, which is not conducive to the timely completion of the felling operation.

[0003] However, the existing saw chains are configured with a single cutting element, and during felling operations, different cutter types of saw chains cannot be continuously replaced according to different tree species (or use environment). The main reason is that the operation of replacing the saw chain is relatively cumbersome. This situation leads to the continuous use of saw chains suitable for certain environmental use on unsuitable felling objects, such as saw chains suitable for cutting hardwood used for felling softwood, saw chains suitable for sandstone environment used in environments with less sandstone, and so on. That is, the existing saw chain products cannot take into account various use environments and use objects, and therefore, it is necessary to improve the existing technology. SUMMARY

[0004] The present application discloses a multi-cutter type arrangement and combination type saw chain and a design method, which adopts a multi-cutter element combination type design method to concentrate the advantages of multiple cutting elements in one saw chain, meet the use requirements of various working conditions, and make up for the deficiencies of traditional saw chains that cannot take into account high sharpness, high applicability and high reliability.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: A multi-cutter type arrangement and combination type saw chain, comprising a saw chain body, wherein the saw chain body is provided with a plurality of cutting elements, and the plurality of cutting elements are arranged in a set order and combined into a cutting mechanism compatible with multiple use objects.

[0006] Preferably, the cutting elements are two or three or more than three.

[0007] Preferably, the plurality of cutting elements are arranged into cutting units in a set order, and the cutting units are arranged in sequence on the saw chain body.

[0008] Preferably, the cutting elements include two or three of a round corner cutter type, a right angle cutter type and an oblique angle cutter type.

[0009] A design method of a multi-cutter type arrangement combined saw chain, comprising: a double-cutter type combined mode and a three-cutter type combined mode.

[0010] Preferably, the double-cutter type combined mode comprises the following two basic modes: (1) In the reverse direction of the saw chain running, each cutting unit comprises a rounded corner cutting element region A1, a right angle cutting element region B1, a rounded corner cutting element region C1 and a right angle cutting element region D1 arranged in sequence on the saw chain body; (2) In the reverse direction of the saw chain running, each cutting unit comprises a rounded corner cutting element region A2, a rounded corner cutting element region B2, a right angle cutting element region C2 and a right angle cutting element region D2 arranged in sequence on the saw chain body; In the above two basic modes, the number ratio of the right angle cutting element and the rounded corner cutting element is adjusted according to the difficulty of the cutting object, and the right angle cutting element and the rounded corner cutting element are uniformly distributed in each corresponding region.

[0011] Preferably, the three-cutter type combined mode comprises the following basic mode: in the reverse direction of the saw chain running, each cutting unit comprises a right angle cutting element region A3, a rounded corner cutting element region B3 and an oblique angle cutting element region C3 arranged in sequence.

[0012] Preferably, in the double-cutter type combined mode: The method for improving the flatness of the cutting surface is: setting the side angle of the right angle cutting element tooth as ∠1 and the side angle of the rounded corner cutting element tooth as ∠2, designing the degrees of ∠1 and ∠2 according to 80°<∠1<∠2≤90°, setting the maximum distance from the longitudinal midplane of the transmission element in the running direction of the saw chain to the side wall of the rounded corner cutting element tooth as a1 and to the side wall of the right angle cutting element tooth as a2, a1 and a2 respectively representing the effective cutting width of the rounded corner cutting element and the right angle cutting element, setting a1>a2, that is, ensuring the contact of the rounded corner cutting element with the surface, reducing the influence of the right angle cutting element on the cutting surface, and further improving the flatness of the cutting surface; The method for improving the balance of the left and right sides of the saw chain is: setting the longitudinal midplane of the transmission element in the running direction of the saw chain as the middle position, the maximum thickness of the tooth side wall of the right angle cutting element on one side of the middle position as a4 and the maximum thickness of the tooth side wall of the rounded corner cutting element on the other side as a3, setting a3 less than a4, that is, in the cutting process, the resistance area of the tooth side wall of the rounded corner cutting element is less than that of the right angle cutting element, and the tooth of the right angle cutting element is sharper than that of the rounded corner cutting element, so as to keep the balance of the left and right sides of the saw chain during running; The method for improving the cutting efficiency of the saw chain is: the maximum thickness a5 and a6 of the blade tip represent the effective cutting depth of the right-angle cutting element and the effective cutting depth of the round-angle cutting element, that is, the depth of the blade tip of the right-angle cutting element and the blade tip of the round-angle cutting element cutting into wood, and a5 is greater than a6, so that the right-angle cutting element has the characteristic of being sharper.

[0013] The beneficial effects of the multi-blade type arrangement combined saw chain and design method are: (1) The advantages of various cutting elements are concentrated in one saw chain through the combined design of the various cutting elements, various working conditions are met, and the shortcomings of the traditional saw chain, such as not being able to balance high sharpness, high applicability and high reliability, are made up.

[0014] (2) The application provides a combination mode of two or more cutting elements, which provides the possibility of customizing the saw chain, and the technical solution adopts the combination of a few cutting elements, has low requirements on production process and equipment, and can meet the requirements by using the existing process and equipment, that is, the scheme has low implementation cost and is beneficial to popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 : the schematic diagram of the overall structure of the saw chain body in an embodiment of the application; Figure 2 : the schematic diagram of a double-blade type combination mode in an embodiment of the application; Figures 3-6 : the partial view of Figure 2 ; Figure 7 : the schematic diagram of a double-blade type combination mode two in an embodiment of the application; Figures 8-11 : the partial view of Figure 7 ; Figure 12 : the schematic diagram of a three-blade type combination mode in an embodiment of the application; Figures 13-16 : the partial view of Figure 12 ; Figure 17 : the schematic diagram of the side cutting design principle of the saw chain cutting element in an embodiment of the application; Figure 18 : the schematic diagram of the top surface cutting design principle of the saw chain cutting element in an embodiment of the application; Figure 19 : the side view of the saw chain cutting element in an embodiment of the application ((1) the side view of the right-angle cutting element; (2) the side view of the cutting element combined with the right-angle and the round-angle; (3) the side view of the round-angle cutting element).

[0016] Reference: 01, round cutting element; 011, gullet flank; 012, gullet top; 02, straight cutting element; 03, cutting direction; 1: right round cutting element, 2: left round cutting element, 3: right straight cutting element, 4: left straight cutting element, 5: rivet, 6: transmission element, 7: connecting element; 8: wood, 9: saw chain, 10: to-be-cut wood side, 11: round cutting element side cutting edge (top view angle of gullet flank front end), 12: cut wood side, 13: straight cutting element cutting edge movement track, 14: A1 area saw chain round cutting element top gullet cutting schematic diagram, 15: round cutting element blade tip cutting position, 16: round cutting element cutting support position, 17: groove one, 18: straight cutting element blade tip cutting position, 19: straight cutting element cutting support position, 20: groove two, 21: round cutting element blade rounding, 22: round cutting element inner bending area, 23: straight cutting element blade rounding, 24: straight cutting element inner bending area, 25: B1 area saw chain straight cutting element top gullet cutting schematic diagram, 26: round cutting element blade, 27: straight cutting element blade. DETAILED DESCRIPTION

[0017] The following description is only a preferred embodiment of the present application, and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the scope of protection of the present application.

[0018] The following embodiments can be understood as part of the expression of the partial structure or method of the present application, or can be understood as the mutual combination of the embodiments to explain the larger scope of the structure or method of the present application.

[0019] Embodiment 1: A multi-cutter type arrangement combined saw chain, comprising a saw chain body, wherein a plurality of cutting elements are arranged on the saw chain body, and the plurality of cutting elements are arranged in a set order and combined into a cutting mechanism compatible with a plurality of use objects.

[0020] The saw chain body is a common structure, typically including cutting elements, transmission elements, rivets, and connecting elements. Several transmission elements are arranged sequentially. A first connecting unit consists of two opposing connecting elements, with their two connecting holes aligned one-to-one. These opposing connecting holes are connected to the connecting holes of adjacent transmission elements via rivets. A second connecting unit consists of one connecting element and one cutting element, arranged opposite each other. In the second connecting unit, the two connecting holes of the cutting element are aligned one-to-one with the two connecting holes of the connecting element, and these opposing connecting holes are connected to the connecting holes of adjacent transmission elements via rivets. The first and second connecting units are alternately arranged, with adjacent cutting elements located on either side of the transmission elements.

[0021] Example 2: One way to improve this invention is as follows: like Figure 1 As shown, the saw chain body is arranged with the following components in sequence: right rounded corner cutting element 1, left rounded corner cutting element 2, right right angle cutting element 3, and left right angle cutting element 4. The right rounded corner cutting element 1, left rounded corner cutting element 2, right right angle cutting element 3, and left right angle cutting element 4 constitute one cutting unit. Each cutting unit is arranged in sequence on the saw chain body.

[0022] like Figure 1 As shown, the saw chain body is equipped with rivets 5, transmission elements 6, and connecting elements 7. The transmission elements 6 and rivets 5 are fitted with a clearance, and the transmission elements 6 can rotate around the rivets 5. The right rounded corner cutting element 1, the left rounded corner cutting element 2, the right right angle cutting element 3, the left right angle cutting element 4, and the corresponding connecting elements 7 are fixedly connected by riveting with rivets 5.

[0023] The arrangement of the right rounded corner cutting element 1, left rounded corner cutting element 2, right right-angle cutting element 3, and left right-angle cutting element 4 on the saw chain body is as follows: Figure 2 As shown, Figure 2 This is a technical solution using a double-blade combination, where the cutting direction is that the saw chain moves to the right, such as... Figure 3 As shown, area A1 is the rounded corner cutting element area. The main function of this area is to utilize the advantages of the rounded corner cutting element to improve the flatness of the saw chain's cut surface and enhance its adaptability in complex environments containing hard particles such as sand and gravel. Figure 4 As shown, region B1 is the right-angle cutting element area. The main function of this area is to utilize the advantages of right-angle cutting elements to increase the cutting speed and efficiency of the saw chain; for example... Figure 5 As shown, area C1 is the area for rounded corner cutting elements, and its function is the same as A1; as Figure 6 As shown, region D1 is the area for right-angled cut elements, which has the same function as region B1, and subsequent chain links are arranged in this cycle.

[0024] The rounded cutting element refers to the angle between the top of the cutting tooth 012 and the side of the cutting tooth 011 of the rounded cutting element 01 as shown in Figure 3 , 5 . The right-angle cutting element refers to the angle between the top of the cutting tooth and the side of the cutting tooth of the right-angle cutting element as shown in Figure 4 , 6 .

[0025] Example 3: Another improvement is that: If large-diameter wood is cut, the right-angle cutting elements and the rounded cutting elements can be arranged and combined as shown in Figure 7 , arranged from right to left in the reverse direction of the cutting direction, with the A2 and B2 areas being rounded cutting element areas and the C2 and D2 areas being right-angle cutting element areas, and subsequent links being arranged in turn in a cycle, as shown in detail in Figures 8-11 . The advantage of this arrangement is that when large-diameter wood is cut, more cutting teeth participate in cutting at the same time inside the wood, which can cause the cutting form to change too frequently (switching between rounded cutting and right-angle cutting), and increasing the rounded cutting area and the right-angle cutting area can reduce this switching frequency and improve cutting stability.

[0026] Example 4: Another improvement is that: Taking the combination of the right-angle cutting element and the rounded cutting element as an example, if the working conditions are extremely complex (such as many sand particles or many hard woods), then the proportion of the rounded cutting element can be increased according to the needs, such as changing the number ratio of the rounded cutting element to the right-angle cutting element from 1:1 to 2:1, i.e., the number of the rounded cutting element is twice the number of the right-angle cutting element.

[0027] Example 5: Another improvement is that: taking the combination of the right-angle cutting element and the rounded cutting element as an example, if it is a normal working condition (such as very few sand and mostly wood that is easy to cut), then the proportion of the right-angle cutting element can be appropriately increased, such as changing the number ratio of the rounded cutting element to the right-angle cutting element from 1:1 to 1:2, i.e., the number of the right-angle cutting element is twice the number of the rounded cutting element.

[0028] Example 6: As shown in Figure 12As shown, this embodiment provides three arrangement schemes for cutting elements. Following the reverse direction of the saw chain's movement, each cutting unit, from right to left, consists of a right-angle cutting element area A3, a rounded-corner cutting element area B3, and an oblique-angle cutting element area C3, then cycling back to the right-angle cutting element area D3. This selection and arrangement of cutting element blades is particularly suitable for hardwood and gravel environments, and especially for use on large logging machines. During large logging operations, the impact on the saw chain during cutting is extremely high due to the machine's power, making the blades prone to chipping or deformation. Oblique-angle and rounded-corner blades can withstand this large impact load, while right-angle blades are prone to chipping under such loads. The presence of oblique-angle and rounded-corner blades can remove large hard particles and impurities from the cutting path, reduce the cutting range and resistance of right-angle blades, lower the risk of chipping, and extend service life. This improves the cutting efficiency of the entire chain while extending its service life. Among them, the oblique-angle cutting element is as follows... Figure 15 As shown, there is a chamfer between the top of the cutting tooth and the side of the cutting tooth.

[0029] Working principle of the invention: Using rounded and right-angled cut elements according to Figure 2 For example, the arrangement method is as follows: like Figure 19 As shown, the right-angle cutting element has an inclination angle ∠1 (the angle between the side surface and the vertical plane) on its side blade (the side of the cutting tooth), while the rounded-corner cutting element has an inclination angle ∠2. ∠1 and ∠2 are adjusted according to requirements. Taking a high degree of surface flatness as an example, the relationship between ∠1 and ∠2 can be 80° < ∠1 < ∠2 ≤ 90°. Appropriately increasing the inclination angle of the rounded-corner cutting element is more conducive to improving the flatness of the wood cut surface. a1 and a2 represent the effective cutting widths of the rounded-corner and right-angle cutting elements, respectively. Designing a1 > a2 ensures that the rounded-corner cutting element contacts the cut surface, reducing the influence of the right-angle cutting element on the cut surface; thus, it effectively guarantees the flatness of the cut surface. Figure 17 As shown, when the saw chain is cutting in the tree 8, the front end 11 of the tooth side of the rounded cutting element blade 26 contacts the wood and cuts it. After the side of the wood to be cut 10 is cut, it becomes wider than the width of the side of the wood that has been cut 12, depending on the sawing direction. The dotted line 13 is the forward trajectory of the cutting edge (front end of the tooth side) of the right-angle cutting element blade 27. The possibility of it contacting the side cutting surface of the wood will be significantly reduced, thereby reducing its impact on the flatness of the cut surface.

[0030] like Figure 19 As shown, the maximum thicknesses a3 and a4 of the sidewall of the cutting teeth will affect the left and right forces on the saw chain during the cutting process. To prevent excessive left and right swaying, a3 is designed to be slightly smaller than a4.

[0031] like Figure 19As shown, in order to improve the strength of the cutting element, a transition arc design is adopted at the inner bending area 22 of the rounded corner cutting element and the inner bending area 23 of the right-angle cutting element to avoid stress concentration and breakage.

[0032] like Figure 19 As shown, the maximum thicknesses a5 and a6 at the top of the cutting teeth represent the effective cutting depths of the right-angle cutting element and the rounded-corner cutting element, respectively, i.e., the depth to which the cutting tips 23 and 21 of the right-angle cutting element cut into the wood. During sawing, the right-angle cutting element is sharper. To fully utilize its sharpness, a5 is slightly larger than a6 in this design. Appropriately reducing the value of a6 also helps to reduce the occurrence of left-right force imbalance and improve cutting stability. Figure 18 As shown, 14 is the cutting area of ​​the rounded corner cutting element, and 25 is the cutting area of ​​the right-angle cutting element. Both cutting methods are carried out under the support of the support plate on the front side of the cutting element (see: rounded corner cutting element cutting support position 16, right-angle cutting element cutting support position 19), so that the rounded corner cutting edge and the right-angle cutting edge penetrate into the wood (see: rounded corner cutting element tip cutting position 15, right-angle cutting element tip cutting position 18). Then, under the power drive, groove 17 and groove 20 formed after cutting are left on the wood surface. In order to reduce vibration, ensure force balance and improve cutting speed, the groove depth of the rounded corner cutting area is slightly smaller than the groove depth of the right-angle cutting area in this scheme.

[0033] As described above, the design method mentioned in this invention can arrange and combine the cutting elements on the saw chain body according to the following principles: (1) Arrange and combine according to different work scenarios; (2) Based on the differences in the depth of wood cutting by different cutting elements on the front and side, the cutting advantages of the cutting mechanism are fully utilized; (3) Based on the difference in the blade tip width of different cutting elements, ensure that the force on different cutting elements is balanced in the transverse and longitudinal directions; (4) The cutting depth, cutting angle and blade top width of different cutting elements are designed in relation to different usage scenarios.

Claims

1. A multi-cutter type combination saw chain, characterized by: The saw chain body is provided with a plurality of cutting elements arranged in a set order and combined into a cutting mechanism compatible with a plurality of use objects.

2. A multi-blade combination saw chain as set forth in claim 1, characterized in that: The cutting elements are two or three or more.

3. A multi-blade combination saw chain as set forth in claim 2, characterized in that: The plurality of cutting elements are arranged in cutting units in a set order and sequentially arranged on the saw chain body.

4. A multi-blade combination saw chain as set forth in claim 3, characterized in that: The cutting elements include two or three of a round corner cutter, a right angle cutter and an oblique angle cutter.

5. The method of designing a multi-blade type combination saw chain according to claim 4, characterized in that: The cutting elements include two or three of a round corner cutter, a right angle cutter and an oblique angle cutter. The cutting elements include two or three of a round corner cutter, a right angle cutter and an oblique angle cutter.

6. The design method of the multi-cutter arrangement combination saw chain according to claim 5, characterized in that the double-cutter combination mode includes the following two basic modes: (1) in the opposite direction of the saw chain running, each cutting unit sequentially includes a round corner cutting element region A1, a right angle cutting element region B1, a round corner cutting element region C1 and a right angle cutting element region D1 arranged on the saw chain body; (2) in the opposite direction of the saw chain running, each cutting unit sequentially includes a round corner cutting element region A2, a round corner cutting element region B2, a right angle cutting element region C2 and a right angle cutting element region D2 arranged on the saw chain body; In the above two basic modes, the number ratio of the right angle cutting elements and the round corner cutting elements is adjusted according to the difficulty of the cutting object, and the right angle cutting elements and the round corner cutting elements are uniformly distributed in each corresponding region.

7. The method of designing a multi-blade type combination saw chain according to claim 5, characterized in that: The three-cutter combination mode includes the following basic mode: in the opposite direction of the saw chain running, each cutting unit sequentially includes a right angle cutting element region A3, a round corner cutting element region B3 and an oblique angle cutting element region C3.

8. The method of designing a multi-blade type combination saw chain according to claim 6, characterized in that: In the double-cutter combination mode: The method for improving the flatness of the cutting surface is to set the side wall inclination angle of the right angle cutting element tooth as ∠1 and the side wall inclination angle of the round corner cutting element tooth as ∠2, to design the degrees of ∠1 and ∠2 according to 80°<∠1<∠2≤90°, to set the maximum distance of the longitudinal middle surface of the transmission element in the running direction of the saw chain to the side wall of the round corner cutting element tooth as a1 and to the side wall of the right angle cutting element tooth as a2, a1 and a2 respectively representing the effective cutting width of the round corner cutting element and the right angle cutting element, to set a1>a2, to ensure the contact of the round corner cutting element with the surface, to reduce the influence of the right angle cutting element on the cutting surface, and to further improve the flatness of the cutting surface; The method for improving the balance of the left and right sides of the saw chain is to set the longitudinal middle surface of the transmission element in the running direction of the saw chain as the middle position, to set the maximum thickness of the side wall of the right angle cutting element on one side of the middle position as a4 and the maximum thickness of the side wall of the round corner cutting element on the other side of the middle position as a3, to set a3 less than a4, to make the resistance area of the side wall of the round corner cutting element smaller than that of the side wall of the right angle cutting element during the cutting process, and to combine the sharper tooth of the right angle cutting element with the tooth of the round corner cutting element to keep the balance of the left and right sides of the saw chain during the running process. The method for improving the cutting efficiency of the saw chain is that the maximum thickness a5 and a6 of the tooth top respectively represent the effective cutting depth of the right-angle cutting element and the effective cutting depth of the round-angle cutting element, that is, the depth of the right-angle cutting element and the round-angle cutting element cutting into the wood, and a5 is greater than a6, so that the right-angle cutting element has the characteristic of being sharper.

Images