Cold-resistant saw blade and polishing device thereof

Abstract

The application discloses a cold-resistant saw blade and a grinding device thereof, which comprises a first support fixed on a chain saw body and a second support arranged on the first support. The second support is provided with a grinding assembly for grinding a blade edge of the saw blade. The grinding assembly comprises a shell, a grinding rod and a rocker arm. The grinding rod is connected with a first screw rod, the first screw rod is connected with a first sliding rod, the rocker arm is rotatably arranged on the shell, and the first sliding rod is connected with the rocker arm. The first screw rod is a bidirectional screw rod, and the shell is provided with a first guide pin matched with the first screw rod. The application provides the cold-resistant saw blade suitable for wood cutting operation in severe cold regions. Through special design of the blade edge angle and optimization of the saw blade material, the saw blade has excellent cutting performance and brittle fracture resistance in a low-temperature environment. Meanwhile, the application also provides a portable grinding device which can be directly installed on the chain saw body and can complete the grinding operation on the spot outdoors without disassembling the saw blade.

Description

Technical Field

[0001] This invention relates to the field of cutting equipment technology, and in particular to a cold-resistant saw blade and its grinding device. Background Technology

[0002] Chainsaws, as highly efficient handheld logging tools, are widely used in forestry, logging, and pruning operations. The saw chain (i.e., the saw blade) is the core working component of a chainsaw, and the sharpness of its cutting edge directly determines the sawing efficiency and work quality. In logging operations in frigid regions, the ambient temperature is extremely low, and the wood is often frozen, significantly increasing its hardness and brittleness. This places even more stringent demands on the cutting performance of the saw blade.

[0003] The cutting edge angle of a saw blade is a key parameter determining its cutting performance. Specifically, the angle between the cutting edge and the cutting direction directly affects cutting resistance, chip removal efficiency, and the durability of the cutting edge. Under normal temperature conditions, the design of the cutting edge angle mainly balances cutting efficiency and cutting edge strength. However, the working environment in frigid regions has unique characteristics: low temperatures cause significant changes in the physical and mechanical properties of wood, increasing the cutting resistance of frozen wood. At the same time, the saw blade material becomes less tough and more brittle at low temperatures, making the cutting edge more prone to chipping or breakage. Therefore, cold-resistant saw blades used in frigid regions require specialized design and optimization of their cutting edge angle and materials to meet the cutting needs under low-temperature conditions.

[0004] On the other hand, after prolonged use, the saw blade inevitably wears down and becomes dull, requiring regular sharpening to restore its cutting performance. Existing saw blade sharpening devices are typically fixed workbenches, requiring operation within a specific tool shed. This fixed sharpening method cannot meet the practical needs of outdoor operations in frigid regions—logging operations are usually long-term fieldwork, with work sites far from the tool shed. When the saw blade needs temporary sharpening during operation, workers can only use conventional hand tools such as files.

[0005] Manual filing has many drawbacks: First, it is difficult to control the force and precision of the filing, and the skill levels of different operators vary, making it difficult to ensure that the same cutting edge angle and grinding amount are achieved every time. Second, uneven force during manual filing can easily lead to local overheating, deformation, or even breakage of the cutting edge, seriously affecting the service life of the saw blade. Third, conventional manual filing is inefficient, and in frigid outdoor environments, operators are exposed to low temperatures for extended periods while performing delicate manual operations, resulting in high labor intensity. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a cold-resistant saw blade suitable for logging operations in frigid regions. Through a special design of the cutting edge angle and an optimized ratio of saw blade materials, the saw blade exhibits excellent cutting performance and resistance to brittle fracture in low-temperature environments. Simultaneously, it also provides a portable grinding device that can be directly mounted on the chainsaw body, allowing grinding operations to be completed on-site outdoors without disassembling the saw blade.

[0007] To solve the above-mentioned technical problems, the present invention provides a grinding device for cold-resistant saw blades, comprising a first bracket fixed to the main body of a chainsaw and a second bracket mounted on the first bracket. The second bracket is equipped with a grinding assembly for grinding the cutting edge of the saw blade. The grinding assembly includes a housing, a grinding rod, and a rocker arm. The grinding rod is connected to a first lead screw, which is connected to a first sliding rod. The rocker arm is rotatably mounted on the housing, and the first sliding rod is connected to the rocker arm. The first lead screw is a bidirectional helical lead screw, and the housing is provided with a first guide pin that cooperates with the first lead screw. The rocker arm rotates to rotate the grinding rod, which is then reciprocated by the first lead screw to grind the cutting edge within the notch.

[0008] In the above-described scheme, preferably, the housing is provided with several guide rods that are slidably connected to the second support. A first spring is sleeved on each guide rod, with both ends of the first spring abutting against the second support and the outer wall of the housing, respectively. The second support is displaced relative to the first support, causing the grinding rod on the housing to abut against the saw blade and be compressed by the elastic force of the first spring.

[0009] In the above scheme, preferably, the first bracket is provided with a positioning shaft, the positioning shaft is provided with a second lead screw that cooperates with the second bracket, the second bracket is provided with a second guide pin that cooperates with the second lead screw, and the second guide pin engages with the second lead screw so that the second lead screw drives the second bracket to move relative to the first bracket when rotating.

[0010] In the above scheme, preferably, one end of the positioning shaft is rotatably engaged with the first bracket, and the other end is provided with a transmission component between it and the first sliding rod.

[0011] In the above-described scheme, preferably, the transmission assembly includes an intermittent gear rotatably mounted on the housing and a transmission gear meshing with the intermittent gear, with a first sliding rod slidably passing through the center of the intermittent gear. The transmission gear includes a telescopic shaft, which is slidably connected to the end of a second lead screw, and the end of the second lead screw has a telescopic hole.

[0012] In the above scheme, preferably, the first support is provided with an auxiliary shaft that cooperates with the second support to achieve directional and stable sliding of the second support relative to the first support.

[0013] In the above-described scheme, preferably, a clutch assembly is provided between the first sliding rod and the rocker arm. The clutch assembly includes a first clutch pawl and a positioning nut disposed on the first sliding rod, and a clutch spring is disposed between the first clutch pawl and the positioning nut. The rocker arm includes a rotating sleeve that rotatably engages with the housing and a handle. The rotating sleeve is provided with a second clutch pawl that meshes with the first clutch pawl.

[0014] In the above scheme, preferably, a second spring is provided between the second guide pin and the second bracket, and a pull rope is connected to the second guide pin. A pull rope plate is rotatably sleeved on the first clutch pawl, and the pull rope plate is connected to the pull rope so that when the first clutch pawl overcomes the elastic force of the clutch spring and disengages from the second clutch pawl, it drives the pull rope plate to move, and further pulls the pull rope to disengage the second guide pin from the second lead screw, thereby realizing the reset displacement of the second bracket relative to the first bracket.

[0015] The present invention also provides a cold-resistant saw blade polished by the above-mentioned polishing device, comprising a saw blade body and a cutting edge and a groove provided on the saw blade body. The cutting edge is an inclined cutting edge, which extends inclinedly to one side from one end in the direction of travel, and the angle between the cutting edge and the direction of travel is 55-65°. The groove near the edge of the cutting edge forms an arc-shaped transition surface that matches the outer diameter of the polishing rod.

[0016] In the above-mentioned scheme, preferably, the saw blade is composed of the following chemical composition by weight percentage: carbon (C): 0.55%–0.65%; nickel (Ni): 1.40%–1.80%; chromium (Cr): 0.70%–1.00%; molybdenum (Mo): 0.20%–0.30%; manganese (Mn): 0.70%–0.90%; niobium (Nb): 0.15%–0.30%; vanadium (V): 0.10%–0.25%; total content of phosphorus (P) and sulfur (S): ≤0.035%; the balance being iron (Fe) and unavoidable impurities.

[0017] The beneficial effects of the present invention are as follows: The cold-resistant saw blade and its grinding device provided by the present invention have many beneficial effects.

[0018] First, the angle between the cutting edge and the direction of travel of the cold-resistant saw blade is 55° to 65°. This angle is specifically optimized for the cutting characteristics of frozen wood in extremely cold regions. Under low temperature and high resistance conditions, it can achieve the best balance between cutting resistance and cutting edge strength, ensuring cutting efficiency while reducing the risk of breakage. At the same time, the arc-shaped transition surface of the groove edge is adapted to the outer diameter of the grinding rod, which facilitates precise grinding by the grinding device. Furthermore, the saw blade has an optimized chemical composition by adding alloying elements such as nickel, chromium, molybdenum, manganese, niobium, and vanadium. This synergistically lowers the ductile-brittle transition temperature, improves hardenability, refines grains, and strengthens the saw blade through precipitation. This allows the saw blade to maintain excellent toughness, wear resistance, and impact resistance even in extremely cold environments below -40°C.

[0019] Meanwhile, the grinding device is directly fixed to the chainsaw body via the first bracket, allowing grinding to be completed on-site without disassembling the saw blade, overcoming the shortcomings of traditional fixed grinding devices that cannot operate in the field. When the resistance on the grinding rod reaches the clutch spring preload threshold, the first and second clutch pawls automatically disengage. The rotational power of the rocker arm is transmitted to the second lead screw via intermittent gears and transmission gears, driving the second bracket to retract and reset, disengaging the grinding rod from the cutting edge. After the resistance disappears, the clutch assembly automatically re-engages, and the grinding rod is fed back for grinding. This cycle repeats, achieving a pulse-like contact grinding effect of "forward grinding - retraction reset - forward grinding again," perfectly simulating the manual operation of pressing and rubbing with a file. This ensures that the force of each grinding action is uniform and controllable, avoiding overheating and excessive wear caused by continuous rigid pressure, and significantly reducing the intensity of manual operation through automatic cycling. Meanwhile, the cooperation between the bidirectional helical screw and the first guide pin causes the grinding rod to reciprocate axially while rotating. This composite motion trajectory coincides with the arc-shaped transition surface, enabling uniform grinding of the entire arc-shaped area of ​​the cutting edge in one pass, further improving grinding accuracy and consistency. In addition, the guide rod and the first spring provide elastic compression, maintaining a moderate and stable contact pressure between the grinding rod and the cutting edge, avoiding deformation or breakage caused by rigid contact; the intermittent gear and the transmission gear in the transmission assembly realize the linkage control between the displacement of the second support and the feed of the grinding rod. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the mating structure of the grinding device and the chainsaw body of the present invention.

[0021] Figure 2 This is a cross-sectional view of the grinding device of the present invention.

[0022] Figure 3 This is a top view of the saw blade structure of the present invention.

[0023] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the saw blade of the present invention. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: See also Figures 1-5 .

[0026] Example 1

[0027] This invention provides a grinding device for cold-resistant saw blades, including a first bracket 1 fixed to the main body of a chainsaw and a second bracket 2 disposed on the first bracket 1; the first bracket 1 can be fixedly connected to a suitable part of the chainsaw body by bolts, and the specific fixing method can be adapted to the structural characteristics of different models of chainsaws, such as... Figure 1 As shown, the first bracket 1 extends and is connected to one side of the chainsaw body by fixing bolts.

[0028] The second support 2 is provided with a grinding assembly 3 for grinding the cutting edge 12 on the saw blade 11; the grinding assembly 3 includes a housing 301, a grinding rod 302 and a rocker arm 303, the grinding rod 302 is connected to a first lead screw 304, the first lead screw 304 is connected to a first sliding rod 305, the rocker arm 303 is rotatably mounted on the housing 301, and the first sliding rod 305 is connected to the rocker arm 303.

[0029] The first lead screw 304 is a bidirectional helical lead screw, and the housing 301 is provided with a first guide pin 306 that cooperates with the first lead screw 304. The surface of the bidirectional helical lead screw is provided with two sections of threads with opposite directions of rotation. When the first lead screw 304 rotates, the first guide pin 306 cooperates with the helical groove on the surface of the lead screw, so that the first lead screw 304 rotates circumferentially and reciprocates axially at the same time. When the rocker arm 303 rotates, it drives the first lead screw 304 to rotate through the first sliding rod 305. Under the cooperation of the bidirectional helix and the first guide pin 306, the first lead screw 304 drives the grinding rod 302 to rotate and reciprocate axially, thereby achieving precise grinding of the cutting edge 12 in the groove 13.

[0030] like Figure 2 As shown, the housing 301 is provided with several guide rods 31 that are slidably connected to the second support 2. Preferably, there are two guide rods 31, symmetrically arranged on one side of the housing 301, to ensure the stability of the housing 301 when sliding relative to the second support 2. A first spring 32 is sleeved on each guide rod 31, with its two ends abutting against the second support 2 and the outer wall of the housing 301, respectively. When the second support 2 moves relative to the first support 1 towards the saw blade 11, the grinding rod 302 on the housing 301 gradually abuts against the cutting edge 12 of the saw blade 11. At this time, the first spring 32 is compressed, and its rebound force causes the housing 301 to experience an elastic thrust away from the second support 2, thereby causing the grinding rod 302 to press against the surface of the cutting edge 12 with elastic pressure.

[0031] like Figure 2As shown, the first bracket 1 is provided with a positioning shaft 101, and the positioning shaft 101 is provided with a second lead screw 102 that cooperates with the second bracket 2. The second bracket 2 is provided with a second guide pin 103 that cooperates with the second lead screw 102. The second guide pin 103 engages with the spiral groove of the second lead screw 102 so that the second lead screw 102 drives the second bracket 2 to move relative to the first bracket 1 when rotating. The surface of the second lead screw 102 is provided with external threads, and one end of the second guide pin 103 extends into the thread groove of the second lead screw 102 and engages with it. When the second lead screw 102 rotates, the thread engagement drives the second guide pin 103 and the second bracket 2 connected to it to move along the axial direction of the second lead screw 102. The first bracket 1 is also provided with an auxiliary shaft 104 that cooperates with the second bracket 2. The auxiliary shaft 104 is arranged parallel to the second lead screw 102, and the second bracket 2 is provided with a corresponding guide hole for the auxiliary shaft 104 to pass through, so as to ensure the directional stability of the second bracket 2 when sliding.

[0032] like Figure 2 , Figure 4 As shown, one end of the positioning shaft 101 is rotatably engaged with the first bracket 1, and the other end is connected to the first sliding rod 305 via a transmission assembly 4. The transmission assembly 4 includes an intermittent gear 401 rotatably mounted on the housing 301 and a transmission gear 402 meshing with the intermittent gear 401. The first sliding rod 305 is guided and slidably disposed through the center of the intermittent gear 401, that is, the first sliding rod 305 passes through the center hole of the intermittent gear 401. The two can slide relative to each other but are circumferentially fixed. When the intermittent gear 401 rotates, it can drive the first sliding rod 305 to rotate synchronously, and the first sliding rod 305 can slide axially relative to the intermittent gear 401. The transmission gear 402 includes a telescopic shaft 403, which is guided and slidably connected to the end of the second lead screw 102. The end of the second lead screw 102 is provided with a telescopic hole 404. One end of the telescopic shaft 403 is fixedly connected to or integrally formed with the transmission gear 402, and the other end extends into the telescopic hole 404 at the end of the second lead screw 102, and can slide axially along the telescopic hole 404. Preferably, the telescopic shaft 403 and the telescopic hole 404 can be configured as hexagonal or other non-circular shapes. When the first lead screw 304 rotates under the rocking motion of the rocker arm 303, the intermittent gear 401 drives the transmission gear 402 to transmit intermittently, thereby driving the second lead screw 102 to rotate through the telescopic shaft 403, thus realizing the transmission of the rotation of the first lead screw 304 to the second lead screw 102.

[0033] like Figure 2As shown, a clutch assembly 5 is provided between the first sliding rod 305 and the rocker arm 303. The clutch assembly 5 includes a first clutch pawl 501 and a positioning nut 502 provided on the first sliding rod 305. A clutch spring 503 is provided between the first clutch pawl 501 and the positioning nut 502. The rocker arm 303 includes a rotating sleeve 33 that is rotatably engaged with the housing 301 and a handle 34. The rotating sleeve 33 is rotatably mounted on the housing 301. The operator can drive the rotating sleeve 33 to rotate relative to the housing 301 by rotating the handle 34. A second clutch pawl 504 that meshes with the first clutch pawl 501 is provided on the rotating sleeve 33.

[0034] A second spring 105 is provided between the second guide pin 103 and the second bracket 2. The second guide pin 103 is connected to a pull rope 106. The elastic force of the second spring 105 keeps the second guide pin 103 engaged with the second lead screw 102. A pull rope plate 505 is rotatably sleeved on the first clutch pawl 501, and the pull rope plate 505 is connected to the pull rope 106.

[0035] The working process of the polishing device of the present invention is as follows: In the initial state, the elastic force of the clutch spring 503 keeps the first clutch pawl 501 and the second clutch pawl 504 engaged. When the operator turns the handle 34, the rocker arm 303 rotates. The rotation of the rocker arm 303 is transmitted to the first sliding rod 305 through the engagement of the first clutch pawl 501 and the second clutch pawl 504. The first sliding rod 305 drives the first lead screw 304 to rotate. Under the action of the bidirectional screw and the first guide pin 306, the first lead screw 304 drives the grinding rod 302 to reciprocate along the axial direction while rotating.

[0036] Simultaneously, the rotation of the first sliding rod 305 is transmitted to the second lead screw 102 through the meshing of the intermittent gear 401 and the transmission gear 402. Specifically, the first sliding rod 305 drives the intermittent gear 401 to rotate, the intermittent gear 401 drives the transmission gear 402 to rotate, and the transmission gear 402 drives the second lead screw 102 to rotate through the telescopic shaft 403. When the second lead screw 102 rotates, it drives the second bracket 2 to slowly move relative to the first bracket 1 toward the saw blade 11 through the threaded engagement with the second guide pin 103.

[0037] The feeding motion of the second support 2 causes the grinding rod 302 on the housing 301 to gradually come into contact with the cutting edge 12 of the saw blade 11. In the initial stage of contact between the grinding rod 302 and the cutting edge 12, the grinding rod 302 is subjected to small resistance. The first clutch 501 and the second clutch 504 remain engaged. The second support 2 continues to feed, and the grinding rod 302 grinds the cutting edge 12.

[0038] As the second support 2 continues to feed, the contact pressure between the grinding rod 302 and the cutting edge 12 gradually increases, and the resistance experienced by the grinding rod 302 also increases accordingly. When the resistance of the grinding rod 302 reaches the preset damping value (which is determined by the preload of the clutch spring 503), the resistance is transmitted to the first clutch pawl 501 through the first lead screw 304 and the first sliding rod 305, causing the first clutch pawl 501 to overcome the elastic force of the clutch spring 503 and move axially, disengaging from the second clutch pawl 504.

[0039] The axial displacement of the first clutch pawl 501 pulls the pull rope 106 via the rotating pull rope plate 505 sleeved on it. The pull rope 106 further pulls the second guide pin 103 to move against the elastic force of the second spring 105, causing the second guide pin 103 to disengage from the second lead screw 102. At this time, the second support 2 loses the constraint of the second lead screw 102 and, under the action of the elastic restoring force of the first spring 32, returns to its original position relative to the first support 1 a certain distance (i.e., away from the saw blade 11). The grinding rod 302 on the housing 301 then leaves the surface of the cutting edge 12, and the resistance is released.

[0040] The rocker arm 303 continues to rotate under the drive of the handle 34, and the second clutch pawl 504 on the rotating sleeve 33 continues to rotate with the rotating sleeve 33. When the second clutch pawl 504 rotates to a position opposite to the first clutch pawl 501, the first clutch pawl 501 and the second clutch pawl 504 re-engage under the elastic force of the clutch spring 503. At the same time as the first clutch pawl 501 resets, the pull rope plate 505 also resets, the pull rope 106 loosens, and the second guide pin 103 re-engages with the second lead screw 102 under the elastic force of the second spring 105.

[0041] The second lead screw 102 continues to rotate, driving the second support 2 to move relative to the first support 1 towards the saw blade 11, causing the grinding rod 302 to re-engage with the cutting edge 12 for the next round of grinding. This cycle repeats, with the grinding rod 302 repeatedly contacting and leaving the surface of the cutting edge 12 during the alternating feed and reset of the second support 2, achieving repetitive contact grinding and perfectly simulating the effect of manual pressing and reciprocating grinding with a file.

[0042] During the above process, the first spring 32 continuously applies elastic pressure to the housing 301 through the guide rod 31 to ensure that the grinding rod 302 and the cutting edge 12 maintain a moderate grinding pressure during each contact, so as to avoid damage to the cutting edge due to rigid impact. The combined motion of the rotation and reciprocating feed of the grinding rod 302 itself ensures that each contact grinding can evenly cover the entire arc area of ​​the cutting edge 12.

[0043] After grinding one tooth position, the operator can stop rotating the handle 34, and then rotate the saw chain a certain distance so that the next saw blade corresponds to the grinding device. Repeating the above operation can complete the grinding and maintenance of the entire saw chain and saw blade 11. Preferably, an active braking structure can be set on the chainsaw body to keep the saw chain in a non-transmittable state during grinding, maintaining a stationary braking state.

[0044] In the above structure, the rotation of the rocker arm 303 can be manually driven by the operator or automatically driven by a power device such as a motor. The grinding rod 302 is preferably made of wear-resistant material, and its outer diameter is adapted to the arc-shaped transition surface 14 of the groove 13 on the saw blade 11.

[0045] In this embodiment, the outer wall of the second guide pin 103 forms a guiding sliding state with the hole on the second bracket 2, one end of the second spring 105 abuts against the outer wall of the second guide pin 103 away from the second lead screw 102, and the other end abuts against the inner wall of the hole of the second bracket 2.

[0046] In addition, to adapt to the direction of the staggered saw blades 11, the first bracket 1 can be provided with an installation part that mirrors the main body of the chainsaw, so that after the grinding device finishes grinding the saw blades in one direction, it can be disassembled and installed on the other side of the chainsaw to further grind the saw blades in the other direction, and finally achieve complete grinding of the saw blades on the entire chainsaw.

[0047] Example 2

[0048] like Figure 3 , Figure 5 As shown, the present invention also provides a cold-resistant saw blade polished by the above-mentioned polishing device, including a saw blade 11 body and a cutting edge 12 and a groove 13 provided on the saw blade 11 body.

[0049] The cutting edge 12 is an inclined cutting edge, extending obliquely to one side from one end in the direction of travel; the angle α between the cutting edge 12 and the direction of travel is 55-65°. This angle range is specifically optimized for the cutting characteristics of frozen wood in extremely cold regions. In low-temperature environments, the hardness and brittleness of frozen wood increase significantly, resulting in increased cutting resistance. If the cutting edge angle is too small (i.e., the cutting edge is too sharp), although the cutting resistance is low, the cutting edge strength is insufficient, making it prone to chipping under impact loads; if the cutting edge angle is too large, the cutting resistance increases significantly, and the cutting efficiency decreases. Experimental verification shows that when the angle between the cutting edge and the direction of travel is 55-65°, lower cutting resistance can be achieved while ensuring sufficient cutting edge strength, achieving the best balance between cutting efficiency and cutting edge durability.

[0050] The groove 13 near the edge of the cutting edge 12 forms an arc-shaped transition surface 14 that matches the outer diameter of the grinding rod 302. The design of the arc-shaped transition surface 14 facilitates the smooth discharge of wood chips during the cutting process, and the matching with the outer diameter of the grinding rod 302 allows the grinding rod 302 to fit well with the arc-shaped transition surface 14 during reciprocating rotation and feeding, thereby uniformly grinding the entire arc-shaped area of ​​the cutting edge 12.

[0051] The saw blade 11 is composed of the following chemical components by weight percentage: carbon (C): 0.55%–0.65%; nickel (Ni): 1.40%–1.80%; chromium (Cr): 0.70%–1.00%; molybdenum (Mo): 0.20%–0.30%; manganese (Mn): 0.70%–0.90%; niobium (Nb): 0.15%–0.30%; vanadium (V): 0.10%–0.25%; total content of phosphorus (P) and sulfur (S): ≤ 0.035%; The balance consists of iron (Fe) and unavoidable impurities.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding device for cold-resistant saw blades, characterized in that: It includes a first bracket (1) fixed on the main body of the chainsaw and a second bracket (2) disposed on the first bracket (1); The second bracket (2) is provided with a grinding assembly (3) for grinding the cutting edge (12) on the saw blade (11). The grinding assembly (3) includes a housing (301), a grinding rod (302) and a rocker arm (303). The grinding rod (302) is connected to a first lead screw (304). The first lead screw (304) is connected to a first sliding rod (305). The rocker arm (303) is rotatably mounted on the housing (301). The first sliding rod (305) is connected to the rocker arm (303). The first lead screw (304) is a bidirectional helical lead screw, and the housing (301) is provided with a first guide pin (306) that cooperates with the first lead screw (304). The rocker arm (303) rotates to make the grinding rod (302) rotate and reciprocate through the first lead screw (304) to achieve grinding of the cutting edge (12) in the groove (13).

2. The grinding device for a cold-resistant saw blade according to claim 1, characterized in that: The housing (301) is provided with a plurality of guide rods (31) that are slidably connected to the second bracket (2). A first spring (32) is sleeved on the guide rod (31), and the two ends of the first spring (32) abut against the second bracket (2) and the outer wall of the housing (301) respectively. The second bracket (2) is displaced relative to the first bracket (1), so that the grinding rod (302) on the housing (301) abuts against the saw blade (11) and is squeezed by the elastic force of the first spring (32).

3. The grinding device for cold-resistant saw blades according to claim 2, characterized in that: The first bracket (1) is provided with a positioning shaft (101), the positioning shaft (101) is provided with a second lead screw (102) that cooperates with the second bracket (2), the second bracket (2) is provided with a second guide pin (103) that cooperates with the second lead screw (102), the second guide pin (103) meshes with the second lead screw (102) so that when the second lead screw (102) rotates, it drives the second bracket (2) to move relative to the first bracket (1).

4. The grinding device for a cold-resistant saw blade according to claim 1, characterized in that: One end of the positioning shaft (101) is rotatably engaged with the first bracket (1), and the other end is provided with a transmission assembly (4) between it and the first sliding rod (305).

5. The grinding device for a cold-resistant saw blade according to claim 4, characterized in that: The transmission assembly (4) includes an intermittent gear (401) rotatably mounted on the housing (301) and a transmission gear (402) meshing with the intermittent gear (401). The first sliding rod (305) is guided to slide through the center of the intermittent gear (401). The transmission gear (402) includes a telescopic shaft (403), which is guided and slidably connected to the end of the second lead screw (102), and the end of the second lead screw (102) is provided with a telescopic hole (404).

6. The grinding device for a cold-resistant saw blade according to claim 1, characterized in that: The first support (1) is provided with an auxiliary shaft (104) that cooperates with the second support (2) to achieve directional and stable sliding of the second support (2) relative to the first support (1).

7. A grinding device for cold-resistant saw blades according to claim 5, characterized in that: A clutch assembly (5) is provided between the first sliding rod (305) and the rocker arm (303). The clutch assembly (5) includes a first clutch pawl (501) and a positioning nut (502) provided on the first sliding rod (305). A clutch spring (503) is provided between the first clutch pawl (501) and the positioning nut (502). The rocker arm (303) includes a rotating sleeve (33) that is rotatably engaged with the housing (301) and a handle (34). The rotating sleeve (33) is provided with a second clutch pawl (504) that engages with the first clutch pawl (501).

8. The grinding device for a cold-resistant saw blade according to claim 7, characterized in that: A second spring (105) is provided between the second guide pin (103) and the second bracket (2), and a pull rope (106) is connected to the second guide pin (103). A pull rope plate (505) is rotatably sleeved on the first clutch pawl (501). The pull rope plate (505) is connected to the pull rope (106), so that when the first clutch pawl (501) overcomes the elastic force of the clutch spring (503) and disengages from the second clutch pawl (504), it drives the pull rope plate (505) to move, and further pulls the pull rope (106) to disengage the second guide pin (103) from the second lead screw (102), thereby realizing the reset displacement of the second bracket (2) relative to the first bracket (1).

9. The cold-resistant saw blade ground by the cold-resistant saw blade grinding device according to claim 1, characterized in that: Includes the saw blade (11) body and the cutting edge (12) and groove (13) provided on the saw blade (11) body. The cutting edge (12) is an inclined cutting edge, which is formed by extending inclinedly to one side from one end of the traveling direction. The angle between the cutting edge (12) and the traveling direction is 55-65°. The groove (13) near the edge of the cutting edge (12) forms an arc-shaped transition surface (14) that is adapted to the outer diameter of the grinding rod (302).

10. A cold-resistant saw blade according to claim 9, characterized in that: The saw blade (11) is composed of the following chemical components by weight percentage: carbon (C): 0.55%–0.65%; nickel (Ni): 1.40%–1.80%; chromium (Cr): 0.70%–1.00%; molybdenum (Mo): 0.20%–0.30%; manganese (Mn): 0.70%–0.90%; niobium (Nb): 0.15%–0.30%; vanadium (V): 0.10%–0.25%; total content of phosphorus (P) and sulfur (S): ≤ 0.035%; The balance consists of iron (Fe) and unavoidable impurities.

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