Foldable lithium electric saw

Abstract

The invention provides a foldable lithium electric saw. The foldable lithium electric saw comprises a driving device, a cutter assembly, a first supporting device, a second supporting device and an adjusting mechanism. The driving device provides power for the cutter assembly through the driving shaft. The cutter assembly comprises a chain, a chain wheel and a chain guide plate. The chain wheel and the chain guide plate cooperate to support the chain. The driving device is mounted on the first mounting part, and the driving shaft is arranged perpendicular to the extending direction of the first supporting device. The second supporting device is suitable for supporting the chain guide plate in a sliding mode, the second supporting device is suitable for rotating around the driving shaft relative to the first installation part, and the chain guide plate and the chain synchronously rotate along with the second supporting device so that the cutter assembly can be switched between the initial state and the folded state. The adjusting mechanism is suitable for adjusting the tensioning degree of the chain by driving the chain guide plate to approach / leave the chain wheel in the length direction. Switching from the initial state to the folded state is achieved through the second supporting device, the overall size of the electric saw is reduced, and a user can conveniently carry the electric saw to various operation sites.

Description

Technical Field

[0001] The invention belongs to the technical field of electric saws, and in particular relates to a foldable lithium electric saw. Background Art

[0002] In the fields of modern forestry, garden maintenance, and outdoor operations, electric saws are used frequently as an efficient cutting tool. Lithium electric saws have gradually come to the fore due to their advantages such as no power cord constraints and flexible operation. However, the existing lithium electric saws still have room for improvement in portability and tool angle adjustment. Especially for people who need to work in the field for a long time or need to frequently switch between different sites, how to further improve the portability and flexibility while ensuring the performance of the electric saw has become an urgent problem to be solved in the industry. Although existing folding electric saws can be partially folded, they often have problems such as poor structural stability and easy loosening of rotating joints. At the same time, the chain tensioning adjustment of existing lithium electric saws usually adopts a bolt push-type structure, which is cumbersome to operate and prone to backlash. In addition, the lubrication system of the tool assembly often relies on manual oiling, which is inconvenient to maintain. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a foldable lithium electric saw to meet the needs of users.

[0004] To achieve the above object, the present invention provides a foldable lithium electric saw, comprising:

[0005] a drive device comprising a drive shaft;

[0006] A tool assembly, comprising a chain, a sprocket and a chain guide, wherein the sprocket is connected to the drive shaft, the sprocket and the drive shaft are relatively fixed, the sprocket and the chain guide cooperate to support the chain, and the sprocket is meshed with the chain;

[0007] A first supporting device, comprising a gripping portion and a first mounting portion disposed at one end of the gripping portion, the driving device being mounted on the first mounting portion, and the driving shaft being disposed perpendicular to an extending direction of the first supporting device;

[0008] A second supporting device, which is suitable for slidably supporting the chain guide, the second supporting device is suitable for rotating around the driving shaft relative to the first mounting portion, the chain guide and the chain rotate synchronously with the second supporting device, so that the tool assembly switches between the initial state and the folded state;

[0009] An adjusting mechanism, which is suitable for adjusting the tension of the chain by driving the chain guide plate to approach or move away from the sprocket along its length direction;

[0010] A lithium battery, which can supply energy to the driving device. The lithium battery is installed at the other end of the holding part.

[0011] Wherein, in the initial state, the extending direction of the chain guide plate is parallel to the extending direction of the first supporting device and extends outward toward the first mounting part; in the folded state, the extending direction of the chain guide plate is parallel to the extending direction of the first supporting device, the chain guide plate extends outward away from the first mounting part, and the tool assembly rotates 180° from the initial state to the folded state.

[0012] Preferably: In the folded state, the overall size of the electric saw is greatly reduced, and the overall length h2 after folding is shortened to 50%-60% of the overall length h1 in the initial state.

[0013] Preferably: The second supporting device includes a rotating guide plate and a cover plate. The rotating guide plate and the cover plate are adapted to be assembled along the direction of the driving shaft and define a second cavity. The second cavity includes an outlet. The sprocket is installed in the second cavity. The driving shaft is adapted to extend into the second cavity and connect the sprocket. The chain guide plate extends out of the second cavity through the outlet.

[0014] Preferably: The first mounting part defines a first cavity, and at least part of the driving device is arranged in the first cavity.

[0015] Preferably: The outlet is provided with comb teeth, which can automatically clean the sawdust and branches wound on the chain.

[0016] Preferably: The first mounting part includes a first rotating surface. The rotating guide plate includes a second rotating surface and a third rotating surface arranged oppositely. The second rotating surface faces the first rotating surface. The third rotating surface is provided with a guiding slide rail. The chain guide plate includes a guiding chute arranged along its length direction. The guiding slide rail and the guiding chute are in reciprocating sliding fit to eliminate the deflection error during the adjustment process.

[0017] Preferably: The adjusting mechanism includes an adjusting knob and a cam assembly. The cam assembly includes a disk-shaped cam and a follower connected in transmission. The follower is connected to the chain guide plate. The disk-shaped cam is connected to the adjusting knob. The adjusting knob drives the disk-shaped cam to rotate, and then drives the chain guide plate to approach / away from the sprocket through the follower.

[0018] Preferably, the follower includes an integral follower flat plate and a follower bump. The disk cam, the follower flat plate, and the chain guide are parallel to each other. The follower flat plate is connected to the chain guide. The follower bump includes a follower plane that is disposed perpendicular to the length direction of the chain guide. The outer contour of the disk cam contacts the follower plane. When the disk cam rotates, the acting force between the disk cam and the follower is disposed along the length direction of the chain guide.

[0019] Preferably, the rotating guide plate and the cover plate are detachably connected by a bolt structure, which is convenient for disassembly and maintenance. The bolt structure includes a T-shaped screw, a nut, and a tensioning knob. The T-shaped screw is installed on the rotating guide plate. The tensioning knob is fixedly connected to the nut. The tensioning knob is disposed outside the cover plate. The nut extends into the second cavity and is threadedly connected to the thread. The T-shaped screw is disposed along the direction of the drive shaft.

[0020] Further, the adjusting knob is disposed outside the cover plate. The adjusting knob is coaxially disposed with the tensioning knob. The tensioning knob cooperates with the cover plate to axially limit the adjusting knob. The nut is adapted to pass through the adjusting knob and radially limit it.

[0021] Preferably, the foldable lithium-ion saw includes a locking mechanism that is adapted to limit the rotation of the second support mechanism relative to the first support mechanism. The locking mechanism includes:

[0022] At least one locking groove that extends inward perpendicular to the first rotation plane;

[0023] A locking pin that is telescopically disposed on the second support device. The locking pin is disposed parallel to the direction of the drive shaft.

[0024] A locking knob that is adapted to drive the locking pin to engage or disengage with the locking groove to achieve locking / unlocking. When the locking pin is inserted into one of the locking grooves, the tool assembly is in an initial state.

[0025] A return spring that is adapted to urge the locking pin to remain withdrawn from the locking groove to maintain the unlocked state.

[0026] Preferably, the locking pin includes a first stop portion protruding radially therefrom. The second support mechanism is formed with an unlocking groove. A second stop ring is disposed in the unlocking groove. The first stop portion abuts against the second stop ring to limit the locking pin from disengaging from the unlocking groove. Both ends of the return spring abut against the second stop ring and the locking knob. The return spring urges the locking pin to remain completely received in the unlocking groove.

[0027] Preferably, a rotating shaft portion protrudes from the first rotating surface, a sleeve portion is formed on the rotating guide plate, the sleeve portion is sleeved on the rotating shaft portion, a pressing member is disposed on the third rotating surface, the pressing member is connected to the rotating shaft portion and axially limits the rotating guide plate, wherein: the pressing member includes an annular pressing plate, an inner ring portion of the pressing plate is connected to the rotating shaft portion by a plurality of screws, and an outer ring portion of the pressing plate contacts the rotating sleeve portion.

[0028] Preferably, the third rotating surface includes a fan-shaped limiting portion disposed around the sleeve portion, the fan-shaped limiting portion includes a plurality of circumferentially evenly distributed limiting grooves, the pressing member includes a limiting claw extending outward from the pressing plate, and when the second supporting device rotates, the limiting claw can be successively engaged with the limiting grooves.

[0029] Preferably, the pressing member further includes a positioning block, a positioning groove is formed by enclosing the positioning block and the pressing plate, the rotating guide plate includes a convex platform disposed on the third rotating surface, and the sliding rail protrudes from the convex platform. The convex platform includes a positioning protrusion, and when the positioning protrusion is inserted into the positioning groove, the tool assembly is in an initial state, and the second supporting device can only rotate in one direction.

[0030] Preferably, the radian of the fan-shaped limiting portion is π / 2, and when the limiting claw switches to engage with each limiting groove, the second rotating mechanism rotates 10°-20°.

[0031] Preferably, the limiting claw includes a cantilever portion extending outward along one radial direction of the pressing plate and a claw portion disposed at the free end of the cantilever portion, and the claw portion has a V-shaped structure.

[0032] Preferably, the first rotating surface includes a plurality of indicators, the cover plate includes an indicating arrow, and the indicating arrow can be selectively aligned with one of the indicators to indicate the rotation angle. The locking grooves correspond to the indicators one by one, and each locking groove and its corresponding indicator are centrosymmetric about the center of the sprocket, so that the user can intuitively understand the folding angle and state of the device, and the operation is more intuitive and convenient.

[0033] Preferably, the included angle between two adjacent indicators is N times the included angle between two adjacent limiting grooves, and N is a natural number not greater than 18.

[0034] Preferably, an oil injection hole is provided on the first rotating surface. The rotating guide plate includes an oil guiding groove provided on the second rotating surface, an oil storage groove provided on the third rotating surface, and an oil guiding hole communicating the oil guiding groove and the oil storage groove. The oil guiding groove faces the first rotating surface, and a first sealing ring and a second sealing ring are respectively provided on the inner and outer radial sides of the oil guiding groove. The oil storage groove faces the chain. An oil pot storing lubricating oil and an oil pump are provided on the first mounting portion. The oil pump is adapted to pump the lubricating oil into the oil guiding groove through the oil injection hole, and the lubricating oil then flows into the oil storage groove to lubricate the chain. Compared with the prior art in which the oil injection hole is provided on the first mounting portion, this design can prevent the lubricating oil from splashing and has a higher overall cleanliness.

[0035] Preferably, the first supporting device includes a left housing and a right housing. The left housing and the right housing are adapted to be assembled along the direction of the driving shaft and define the holding portion and the first mounting portion. The detachable left housing and right housing facilitate the installation of the driving device, the oil pump, the oil pot, etc.

[0036] Preferably, a hollowed-out area is further provided on the first rotating surface. The user can observe the remaining oil quantity in the oil pot through the hollowed-out area, timely replenish the lubricating oil, ensure that the chain is always in a good lubricated state, extend the service life of the chain and the electric saw, and reduce the maintenance cost. An oil inlet nozzle is provided on the oil pot, and the oil inlet nozzle passes through the first housing and is exposed outside.

[0037] Preferably, a protective plate is rotatably provided on the upper surface of the first mounting portion, and an auxiliary handle is provided on the left side surface of the first mounting portion.

[0038] The beneficial effects of the present invention are as follows:

[0039] 1. Through the unique design of the second supporting device, the chain guide plate and the chain can rotate 180° relative to the first mounting portion around the driving shaft, realizing the switching from the initial state to the folded state. In the folded state, the overall size of the electric saw is greatly reduced, and the overall length after folding is shortened to 50%-60% of the initial state, which is convenient for the user to carry to various working sites.

[0040] 2. The adjusting mechanism adopts the cooperation of an adjusting knob and a cam assembly. The user only needs to rotate the adjusting knob to drive the disk-shaped cam to rotate, and then accurately drive the chain guide plate to approach or move away from the sprocket along its length direction through the follower, realizing the rapid and accurate adjustment of the chain tension.

[0041] 3. The setting of the locking mechanism provides a strong guarantee for the safe use of the electric saw. When the locking pin is inserted into the locking groove, the tool assembly is fixed in the initial state and cannot rotate randomly, effectively avoiding the accident of the tool rotating and hurting people caused by misoperation. Further, by setting multiple locking pins, the tool assembly can be fixed at different angles to adapt to different working sites. In addition, the design of the return spring enables the locking pin to automatically reset after the unlocking operation is completed and maintain the unlocked state, facilitating the rotation of the second support mechanism to adjust the tool angle.

[0042] 4. The multi-angle engagement mechanism of the fan-shaped limiting part and the limiting claw, combined with the locking mechanism, realizes double locking, prevents the tool assembly from rotating under unexpected circumstances, avoids operators from being injured, and improves the safety of the electric saw during use. A single limiting groove can achieve precise positioning of the rotation angle with a minimum of 10°. By setting an angle-scale indicator and a synchronously rotating arrow mark, and combining with the tactile feedback of the limiting claw, double perception of the folding angle is realized.

[0043] 5. The lubrication system composed of an oil injection hole, an oil guide groove, an oil storage tank, and an oil guide hole enables the lubricating oil to be pumped from the oil pot into the oil guide groove through the oil injection hole and then flow into the oil storage tank to lubricate the chain. The whole process is smooth and efficient. Further, the oil guide groove is arranged towards the first rotating surface, and when the lubricating oil flows through the oil guide groove, it can also lubricate the first rotating surface and the second rotating surface, improving the smoothness of the rotation process. Description of the Drawings

[0044] Figure 1 It is a schematic diagram of the initial state of a foldable lithium-ion electric saw provided by the present invention.

[0045] Figure 2 It is a front view of a foldable lithium-ion electric saw provided by the present invention in the initial state.

[0046] Figure 3 It is a schematic diagram of the folded state of a foldable lithium-ion electric saw provided by the present invention.

[0047] Figure 4 It is a front view of a foldable lithium-ion electric saw provided by the present invention in the folded state.

[0048] Figure 5 It is a schematic diagram of the structure of the first support device and related components provided by the present invention.

[0049] Figure 6 It is a schematic diagram of the structure of the second support device and the tool assembly provided by the present invention.

[0050] Figure 7 It is a partial cross-sectional structure schematic diagram of the second support device and the tool assembly provided by the present invention.

[0051] Figure 8 Another sectional structure schematic diagram of the second support device and the tool assembly provided by the present invention.

[0052] Figure 9 Assembly schematic diagram of the rotating guide plate and the pressing member provided by the present invention.

[0053] Figure 10 Assembly schematic diagram of the rotating guide plate and the pressing member from another angle provided by the present invention.

[0054] Figure 11 Structure schematic diagram of the rotating guide plate provided by the present invention.

[0055] Figure 12 Structure schematic diagram of the cam assembly provided by the present invention.

[0056] Figure 13 Schematic diagram of the state of a foldable lithium-ion saw provided by the present invention after rotating 45° clockwise from the initial state.

[0057] In the figure: 1. Driving device; 11. Driving shaft; 21. Chain; 22. Sprocket; 23. Chain guide plate; 231. Guide chute; 3. Lithium battery; 4. First support device; 41. Left housing; 42. Right housing; 43. Holding part; 44. First installation part; 441. First cavity; 442. First rotating surface; 443. Rotating shaft part; 444. Oil injection hole; 445. Hollow area; 45. Protection plate; 46. Auxiliary handle; 5. Second support device; 51. Rotating guide plate; 511. Second rotating surface; 512. Third rotating surface; 513. Sleeve part; 514. Boss; 5141. Positioning protrusion; 515. Guide rail; 516. Sector-shaped limiting part; 5161. Limiting groove; 517. Oil guide groove; 518. Oil storage tank; 519. Oil guide hole; 52. Cover plate; 521. Indication arrow; 53. Second cavity; 532. Comb teeth; 541. First sealing ring; 542. Second sealing ring; 551. T-shaped screw; 552. Nut; 553. Tightening knob; 61. Adjusting knob; 62. Disk-shaped cam; 63. Follower; 631. Follower flat plate; 632. Follower convex block; 6321. Follower plane; 71. Locking groove; 72. Locking pin; 721. First stopping part; 73. Locking knob; 74. Return spring; 75. Unlocking groove; 751. Second stopping ring; 8. Pressing member; 81. Pressing plate; 82. Limiting claw; 821. Cantilever part; 822. Claw part; 83. Positioning block; 84. Positioning groove; 9. Oil pot; 91. Oil inlet nozzle. Detailed implementation manners

[0058] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] Here, it should also be noted that in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0060] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0061] As Figures 1-13 described, a foldable lithium-powered saw includes a drive device 1, a cutter assembly, a lithium battery 3, a first support device 4, a second support device 5 and an adjustment mechanism. The cutter assembly includes a chain 21, a sprocket 22 and a chain guide 23. The sprocket 22 is drivingly connected to a drive shaft 11, and the sprocket 22 is relatively fixed with respect to the drive shaft 11 to ensure the stability of power transmission. The sprocket 22 is more specifically a nine-tooth sprocket, and the sprocket 22 meshes with the chain 21. The sprocket 22 and the chain guide 23 cooperate to support the chain 21 to ensure the stability and safety of the chain 21 during operation. The drive device 1 provides power for the cutter assembly through the drive shaft 11 to ensure the normal operation of the chain 21 and the sprocket 22, thereby realizing the cutting function. The lithium battery 3 can supply energy to the drive device 1. The first support device 4 includes a left housing 41 and a right housing 42. The left housing 41 and the right housing 42 are adapted to be assembled along the direction of the drive shaft 11 and define a holding portion 43 and a first mounting portion 44. The first mounting portion 44 and the lithium battery 3 are respectively arranged at both ends of the holding portion 43. The first mounting portion 44 defines a first cavity 441, and a part of the drive device 1 is arranged in the first cavity 441. The drive shaft 11 is arranged perpendicular to the extending direction of the first support device 4. The second support device 5 is adapted to slidably support the chain guide 23, and the second support device 5 is adapted to rotate relative to the first mounting portion 44 about the drive shaft 11. The chain guide 23 and the chain 21 rotate synchronously with the second support device 5 to enable the cutter assembly to switch between an initial state and a folded state. The adjustment mechanism is adapted to adjust the tension of the chain 21 by driving the chain guide 23 to approach / away from the sprocket 22 along its length direction. Wherein, in the initial state, the extending direction of the chain guide 23 is parallel to the extending direction of the first support device 4 and extends outwardly towards the first mounting portion 44; in the folded state, the extending direction of the chain guide 23 is parallel to the extending direction of the first support device 4, the chain guide 23 extends outwardly away from the first mounting portion 44, and the cutter assembly rotates 180° from the initial state to the folded state. In the folded state, the overall size of the saw is greatly reduced, and the overall length h2 after folding is shortened to 60% of the overall length h1 in the initial state.

[0062] In this embodiment, the second support device 5 includes a rotating guide plate 51 and a cover plate 52. The rotating guide plate 51 and the cover plate 52 are adapted to be assembled along the direction of the drive shaft 11 and define a second cavity 53. The second cavity 53 includes an outlet provided with a comb tooth 532, which can automatically clean the sawdust and branches wound on the chain 21. The sprocket 22 is installed in the second cavity 53. The drive shaft 11 is adapted to extend into the second cavity 53 and connect to the sprocket 22. The chain guide plate 23 extends out of the second cavity 53 through the outlet.

[0063] In this embodiment, the first mounting portion 44 includes a first rotating surface 442. The rotating guide plate 51 includes a second rotating surface 511 and a third rotating surface 512 which are oppositely arranged. The second rotating surface 511 faces the first rotating surface 442. The first rotating surface 442 is convexly provided with a rotating shaft portion 443. The rotating guide plate 51 is formed with a bushing portion 513. The bushing portion 513 is sleeved on the rotating shaft portion 443. A pressing member 8 is arranged facing the third rotating surface 512. The pressing member 8 is connected to the rotating shaft portion 443 and axially limits the rotating guide plate 51, wherein: the pressing member 8 includes an annular pressing plate 81. The inner ring portion of the pressing plate 81 is connected to the rotating shaft portion 443 through a plurality of screws. The outer ring portion of the pressing plate 81 contacts the rotating sleeve portion. The third rotating surface 512 is provided with a boss 514. The boss 514 is provided with a guiding slide rail 515. The chain guide plate 23 includes a guiding chute 231 arranged along its length direction. The guiding slide rail 515 and the guiding chute 231 are in reciprocating sliding fit to eliminate the deflection error during the adjustment process.

[0064] In this embodiment, the adjusting mechanism includes an adjusting knob 61 and a cam assembly. The cam assembly includes a disk-shaped cam 62 and a follower 63 which are in transmission connection. The follower 63 includes an integral follower flat plate 631 and a follower convex block 632. The disk-shaped cam 62, the follower flat plate 631 and the chain guide plate 23 are parallel to each other. The follower flat plate 631 is connected to the chain guide plate 23. The follower convex block 632 includes a follower plane 6321 which is arranged perpendicular to the length direction of the chain guide plate 23. The outer contour of the disk-shaped cam 62 contacts the follower plane 6321. The acting force between the disk-shaped cam 62 and the follower 63 is arranged along the length direction of the chain guide plate 23. The disk-shaped cam 62 is connected to the adjusting knob 61. The adjusting knob 61 drives the disk-shaped cam 62 to rotate, and further drives the chain guide plate 23 to approach / away from the sprocket 22 through the follower 63.

[0065] In this embodiment, the rotating guide plate 51 and the cover plate 52 are detachably connected by a bolt structure, which is convenient for disassembly and maintenance. The bolt structure includes a T-shaped screw 551, a nut 552, and a tightening knob 553. The T-shaped screw 551 is installed on the rotating guide plate 51. The tightening knob 553 is fixedly connected to the nut 552. The tightening knob 553 is arranged outside the cover plate 52, and the nut 552 extends into the second cavity 53 and is threadedly connected. The T-shaped screw 551 is arranged along the direction of the drive shaft 11. Further, the adjusting knob 61 is arranged outside the cover plate 52. The adjusting knob 61 is coaxially arranged with the tightening knob 553. The tightening knob 553 cooperates with the cover plate 52 to axially limit the adjusting knob 61, and the nut 552 is adapted to pass through the adjusting knob 61 and radially limit it.

[0066] In this embodiment, the foldable lithium electric saw includes a locking mechanism, which is adapted to limit the rotation of the second support mechanism relative to the first support mechanism. The locking mechanism includes a plurality of locking grooves 71, a locking pin 72, a locking knob 73, a return spring 74, and an unlocking groove 75. The locking grooves 71 extend into the first cavity 441 perpendicular to the first rotating surface 442. The unlocking groove 75 extends into the second cavity 53 perpendicular to the second rotating surface 511. The locking pin 72 is telescopically arranged in the unlocking groove 75. The locking pin 72 is arranged parallel to the direction of the drive shaft 11. The locking knob 73 is adapted to drive the locking pin 72 to engage or disengage with the locking grooves 71 to achieve locking / unlocking. When the locking pin 72 is inserted into one of the locking grooves 71, the tool assembly is in the initial state. The locking pin 72 includes a first stop portion 721 protruding radially along it. A second stop ring 751 is arranged in the unlocking groove 75. The first stop portion 721 abuts against the second stop ring 751 to limit the locking pin 72 from disengaging from the unlocking groove 75. Both ends of the return spring 74 abut against the second stop ring 751 and the locking knob 73. The return spring 74 drives the locking pin 72 to be completely received in the unlocking groove 75 to maintain the unlocked state.

[0067] In this embodiment, the third rotating surface 512 includes a fan-shaped limiting portion 516 arranged around the bushing portion 513. The fan-shaped limiting portion 516 includes a plurality of circumferentially evenly distributed limiting grooves 5161. The pressing member 8 includes a limiting claw 82 extending outward from the pressing plate 81. The limiting claw 82 includes a cantilever portion 821 extending radially outward along one of the pressing plates 81 and a claw portion 822 arranged at the free end of the cantilever portion 821. The claw portion 822 has a V-shaped structure. When the second support device 5 rotates, the claw portion 822 can be successively engaged with the limiting grooves 5161. The radian of the fan-shaped limiting portion 516 is π / 2. Each time the limiting claw 82 switches to engage with a limiting groove 5161, the second rotating mechanism rotates 15°.

[0068] In this embodiment, the first rotating surface 442 includes a plurality of indicating marks, and the cover plate 52 includes an indicating arrow 521. The indicating arrow 521 can be selectively aligned with one of the indicating marks to prompt the rotation angle. The indicating marks include three indicating marks of 90°, 135°, and 180°. The included angle between two adjacent indicating marks is 45°, which is three times the included angle between two adjacent limiting grooves 5161. The locking grooves 71 correspond to the indicating marks one by one, or the locking grooves 71 only correspond to the 180° indicating mark. The corresponding locking grooves 71 and the indicating marks are centrosymmetric about the center of the sprocket 22. Users can intuitively understand the folding angle and state of the device, and the operation is more intuitive and convenient.

[0069] In this embodiment, the pressing member 8 further includes a positioning block 83. The positioning block 83 and the pressing plate 81 enclose a positioning groove 84. The boss 514 includes a positioning protrusion 5141. When the positioning protrusion 5141 is inserted into the positioning groove 84, the tool assembly is in the initial state, and the second supporting device 5 can only rotate unidirectionally.

[0070] In this embodiment, an oil injection hole 444 is provided on the first rotating surface 442. The rotating guide plate 51 includes an oil guide groove 517 provided on the second rotating surface 511, an oil storage groove 518 provided on the third rotating surface 512, and an oil guide hole 519 connecting the oil guide groove 517 and the oil storage groove 518. The oil guide groove 517 faces the first rotating surface 442. A first sealing ring 541 and a second sealing ring 542 are respectively provided on the inner and outer radial sides of the oil guide groove 517. The oil storage groove 518 faces the chain 21. An oil pot 9 storing lubricating oil and an oil pump are provided on the first mounting portion 44. The oil pump is adapted to pump the lubricating oil into the oil guide groove 517 through the oil injection hole 444. The lubricating oil then flows into the oil storage groove 518 and lubricates the chain 21. Compared with the prior art in which the oil injection hole 444 is provided on the first mounting portion 44, this design can prevent the lubricating oil from splashing, and the overall cleanliness is higher.

[0071] In this embodiment, a hollow area 445 is further provided on the first rotating surface 442. Users can observe the remaining oil volume in the oil pot 9 through the hollow area 445, supplement the lubricating oil in time, ensure that the chain 21 is always in a good lubrication state, extend the service life of the chain 21 and the electric saw, and reduce the maintenance cost. An oil inlet nozzle 91 is provided on the oil pot 9. The oil inlet nozzle 91 passes through the first housing and is exposed outside.

[0072] In this embodiment, a protective plate 45 is rotatably provided on the upper surface of the first mounting portion 44, and an auxiliary handle 46 is provided on the left side surface of the first mounting portion 44.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A foldable lithium electric saw, characterized in that: include: a drive device comprising a drive shaft; A tool assembly, comprising a chain, a sprocket and a chain guide, wherein the sprocket is connected to the drive shaft, the sprocket and the drive shaft are relatively fixed, the sprocket and the chain guide cooperate to support the chain, and the sprocket is meshed with the chain; A first supporting device, comprising a gripping portion and a first mounting portion disposed at one end of the gripping portion, the driving device being mounted on the first mounting portion, and the driving shaft being disposed perpendicular to an extending direction of the first supporting device; A second supporting device, which is suitable for slidably supporting the chain guide, the second supporting device is suitable for rotating around the driving shaft relative to the first mounting portion, the chain guide and the chain rotate synchronously with the second supporting device, so that the tool assembly switches between the initial state and the folded state; An adjusting mechanism, which is suitable for adjusting the tension of the chain by driving the chain guide plate to approach or move away from the sprocket along its length direction; Wherein, in the initial state, the extension direction of the chain guide is parallel to the extension direction of the first supporting device and extends outward toward the first mounting portion; In the folded state, the extension direction of the chain guide is parallel to the extension direction of the first supporting device, the chain guide extends outwardly away from the first mounting portion, and the tool assembly rotates 180° from the initial state to switch to the folded state.

2. A foldable lithium electric saw according to claim 1, characterized in that: The second supporting device comprises a rotating guide plate and a cover plate, the rotating guide plate and the cover plate are adapted to be assembled along the direction of the driving shaft and define a second cavity, the second cavity comprises an outlet, the sprocket is installed in the second cavity, the driving shaft is adapted to extend into the second cavity and connect to the sprocket, and the chain guide extends out of the second cavity through the outlet; The first mounting portion includes a first rotating surface, the rotating guide plate includes a second rotating surface and a third rotating surface that are relatively arranged, the second rotating surface is arranged opposite to the first rotating surface, the third rotating surface is provided with a guide rail, the chain guide plate includes a guide groove arranged along its length direction, and the guide rail and the guide groove are reciprocatingly slidably matched.

3. A foldable lithium electric saw according to claim 2, characterized in that: The adjusting mechanism includes an adjusting knob and a cam assembly, the cam assembly includes a disc-mounted cam and a follower that are transmission-connected, the follower is connected to the chain guide, the disc-mounted cam is connected to the adjusting knob, the adjusting knob drives the disc-mounted cam to rotate, and then drives the chain guide to approach / move away from the sprocket through the follower.

4. A foldable lithium electric saw according to claim 3, characterized in that: The follower includes an integrated follower plate and a follower protrusion, the disc-mounted cam, the follower plate and the chain guide are parallel to each other, the follower plate is connected to the chain guide, the follower protrusion includes a follower plane, the follower plane is arranged perpendicular to the length direction of the chain guide, the outer contour of the disc-mounted cam is in contact with the driven plane, and when the disc-mounted cam rotates, the acting force between the disc-mounted cam and the follower is arranged along the length direction of the chain guide.

5. The foldable lithium electric saw according to claim 2, characterized in that: A locking mechanism is included, which is suitable for limiting the rotation of the second supporting mechanism relative to the first supporting mechanism, and the locking mechanism includes: at least one locking groove, the locking groove extending inwardly perpendicular to the first rotating surface; A locking pin is telescopically arranged on the second supporting device, and the locking pin is arranged parallel to the driving shaft direction. A locking knob, which is suitable for driving the locking pin to engage with or separate from the locking groove to achieve locking / unlocking, and when the locking pin is engaged with the locking groove, the tool assembly is in an initial state; A return spring is adapted to drive the locking pin to keep exiting the locking groove to maintain an unlocked state.

6. The foldable lithium electric saw according to claim 5, characterized in that: The locking pin includes a first stop portion protruding along its radial direction, the second supporting mechanism is formed with an unlocking groove, a second stop ring is arranged in the unlocking groove, the first stop portion abuts against the second stop ring to limit the locking pin from disengaging from the unlocking groove, the two ends of the return spring abut against the second stop ring and the locking knob, and the return spring drives the locking pin to remain completely accommodated in the unlocking groove.

7. The foldable lithium electric saw according to claim 5, characterized in that: The first rotating surface is convexly provided with a rotating shaft portion, the rotating guide plate is formed with a shaft sleeve portion, the shaft sleeve portion is sleeved on the rotating shaft portion, a clamping member is arranged on the third rotating surface, the clamping member is connected to the rotating shaft portion and constitutes an axial limit for the rotating guide plate, wherein: the clamping member includes an annular clamping plate, the inner ring portion of the clamping plate is connected to the rotating shaft portion by a plurality of screws, and the outer ring portion of the clamping plate is in contact with the rotating sleeve portion.

8. The foldable lithium electric saw according to claim 7, characterized in that: The third rotating surface includes a fan-shaped limiting portion arranged around the sleeve portion, the fan-shaped limiting portion includes a plurality of circumferentially evenly distributed limiting grooves, the clamping member includes a limiting claw extending outward from the clamping plate, and when the second supporting device rotates, the limiting claws can be engaged with the limiting grooves one by one.

9. The foldable lithium electric saw according to claim 8, characterized in that: At least one of the following is met: The arc of the sector-shaped limiting portion is π / 2, and each time the limiting claw switches to engage with one of the limiting grooves, the second rotating mechanism rotates 10°-20°; The limiting claw comprises a cantilever portion extending radially outward along one side of the pressing plate and a claw portion arranged at a free end of the cantilever portion, and the claw portion is in a V-shaped structure; The first rotating surface includes a plurality of indicators, the cover plate includes an indicator arrow, and the indicator arrow can be selectively aligned with one of the indicators to indicate the rotation angle. The locking grooves correspond to the indicators one by one, and each locking groove and the corresponding indicator are symmetrical about the center of the sprocket.

10. The foldable lithium electric saw according to claim 2, characterized in that: The first rotating surface is provided with an oil filling hole, the rotating guide plate comprises an oil guide groove provided on the second rotating surface, an oil storage groove provided on the third rotating surface, and an oil guide hole connecting the oil guide groove and the oil storage groove, the oil guide groove is provided toward the first rotating surface, the radial inner and outer sides of the oil guide groove are respectively provided with a first sealing ring and a second sealing ring, and the oil storage groove is provided toward the chain; The first mounting portion is provided with an oil pot and an oil pump storing lubricating oil, and the oil pump is suitable for pumping the lubricating oil into the oil guide groove through the oil filling hole, and the lubricating oil then flows into the oil storage groove and lubricates the chain.

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