Single-hand electric chain saw with combined positioning structure

Abstract

The utility model relates to a single-hand electric chain saw with a combined positioning structure, which comprises a casing, a motor, a control component, a driving component and a saw chain assembly, the motor is arranged on the outer wall of the casing, the control component, the driving component and the saw chain assembly are mounted in the casing, and the saw chain assembly comprises a guide plate, a saw chain and a chain wheel. The device further comprises a first locking bolt and a locking block, an installation cavity is formed in the machine shell, the first locking bolt and the locking block are both installed in the installation cavity, the locking block is in threaded connection with the first locking bolt, a lock hole is formed in the guide plate, and the top of the locking block penetrates through the lock hole to be matched with the guide plate in an inserted connection mode. According to the technical scheme, on the premise that the positioning structure is simple, it can still be guaranteed that the saw chain assembly is effectively positioned, and therefore the assembling process is simplified, time consumption is shortened, efficiency is improved, and labor cost can be correspondingly controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric tools more particularly to a single hand electric chain saw with combined positioning structure. BACKGROUND

[0002] Electric chain saw, also known as electric chain saw, is a kind of sawing tool driven by electricity, which is widely used in forestry, wood processing and other related fields. The saw chain assembly of electric chain saw needs to be positioned during assembly. Accurate positioning is crucial for the normal operation, efficient cutting and safe operation of electric chain saw.

[0003] Chinese patent with publication number CN221158821U discloses an assembled mini electric chain saw. The saw chain assembly of the electric chain saw includes a chain wheel, a guide plate and a saw chain wrapped around the outer circumference of the guide plate. The front part of the machine body 1 is provided with a protective cover that covers and seals the rear side of the saw chain assembly 2. When the connecting column passes through the positioning long hole and the protective cover in sequence, it can be connected by tightening the lock nut. The saw chain assembly is assembled at the head of the machine body, and the chain wheel is positioned and clamped by the upper positioning plate and the lower positioning plate and installed at the rear side of the guide plate. The upper positioning plate and the lower positioning plate are positioned and clamped by the upper fixed plate and the lower fixed plate. The upper fixed plate and the lower fixed plate are positioned and installed on the guide plate. The front side of the upper fixed plate is provided with an upper front plate, and the rear side of the upper fixed plate is provided with an upper support plate. The front side of the lower fixed plate is provided with a lower front plate, and the rear side of the lower fixed plate is provided with a lower support plate. The upper and lower fixed plates are positioned and installed on the top surface and the bottom surface of the guide plate through the upper and lower front plates. In this embodiment, positioning columns and lock holes are provided between the upper front plate and the guide plate and between the lower front plate and the guide plate to form positioning and installation. After the positioning columns and lock holes are positioned and installed, rivets are used for anchoring to prevent the connection from loosening.

[0004] The positioning structure of the saw chain assembly of the above-mentioned electric chain saw is relatively complex. The rear side of the saw chain assembly is locked in the protective cover by the lock nut, and the chain wheel is clamped and installed at the rear side of the guide plate by the upper positioning plate and the lower positioning plate as positioning clamps. At the same time, the guide plate needs to be positioned by the upper fixed plate and the lower fixed plate. More specifically, the number of components of the positioning structure is large, which makes the assembly process too complicated. It takes more time and effort to identify parts, determine the assembly sequence and position during assembly, increasing the difficulty of assembly and the possibility of errors. Moreover, due to the difficulty of assembly, it will also affect the efficiency and increase the labor cost. SUMMARY

[0005] In view of the above, in order to overcome the above-mentioned positioning structure of the existing electric chain saw chain assembly is complex, resulting in assembly process is complicated, assembly time is prolonged, increases the difficulty of assembly and the possibility of error, at the same time will lead to the production efficiency is reduced, the labor cost increases, the utility model discloses a purpose is to provide a kind of in the premise of simple positioning structure, still can ensure that the effective positioning of chain saw chain assembly, so that the assembly process is simplified, time is shortened, efficiency is improved, labor cost can also be controlled accordingly of electric chain saw.

[0006] In order to achieve the above object, the technical solution of the utility model is:

[0007] A single-handed electric chain saw with combined positioning structure, it includes casing, motor, control assembly, driving assembly and chain saw assembly, motor is located on the outer wall of casing, control assembly, driving assembly and chain saw assembly are installed in casing, chain saw assembly includes guide plate, chain saw and sprocket, it further includes first locking bolt and locking block, installation cavity is opened in casing, first locking bolt and locking block are installed in installation cavity, and locking block is threadedly connected with first locking bolt, lock hole is opened in guide plate, the top of locking block is inserted into guide plate through lock hole.

[0008] As preferred, the inner wall of installation cavity is formed with stopper, the stopper is opened with communication channel, and the threaded segment of first locking bolt is threadedly connected with locking block through communication channel.

[0009] As preferred, the locking block is opened with screw hole, and the screw hole is opposite to first locking bolt, and the threaded segment of first locking bolt is threadedly connected in screw hole.

[0010] As preferred, it further includes second locking bolt, threaded sleeve and knob, the guide plate is opened with positioning long hole, the threaded segment of second locking bolt is inserted into positioning long hole from bottom to top, and is threadedly connected with threaded sleeve, and the knob is arranged on threaded sleeve.

[0011] As preferred, the bottom of knob is formed with insertion pipe, threaded sleeve is inserted into insertion pipe and is interference fit with insertion pipe, and the outer peripheral wall of threaded sleeve is further formed with anti-skid line.

[0012] As preferred, the outer wall of knob has locking and unlocking marks.

[0013] As preferred, the casing includes upper shell, lower shell, cover plate and guard plate, the outer wall of front part of upper shell is formed with mounting seat, chain saw assembly is mounted on mounting seat, cover plate is arranged on the rear part of chain saw assembly and is fixed with mounting seat, installation cavity is opened on mounting seat, guard plate is hinged on upper shell and covers chain saw assembly from above, motor is arranged on the inner bottom of lower shell, control assembly and driving assembly are arranged between upper shell and lower shell.

[0014] Preferably, the casing further comprises an anti-skid sleeve, which is sleeved on the rear part of the upper casing and the lower casing.

[0015] Preferably, the control assembly comprises a control circuit board, a power supply, a power switch, a safety switch and an electric quantity indicator lamp, the power supply, the power switch, the safety switch, the electric quantity indicator lamp and the motor are electrically connected with the control circuit board, and the power switch, the safety switch and the electric quantity indicator lamp are arranged on the outer wall of the casing.

[0016] Preferably, the driving assembly comprises a driving gear, a driven gear, a rolling bearing and a transmission shaft, the driving gear is sleeved on the output end of the motor, the driven gear is arranged on one side of the driving gear and is engaged with the driving gear, the lower end of the transmission shaft is connected with the rolling bearing, and the upper end of the transmission shaft passes through the driving gear and is connected with the sprocket, and the cooperation surface of the transmission shaft and the sprocket is non-circular.

[0017] Compared with the prior art, the electric chain saw has the following advantages:

[0018] The top of the locking block can pass through the locking hole and be inserted and matched with the guide plate, the first locking bolt is locked through the self-locking property of the threaded connection, so that the locking block is tightly matched with the locking hole and the clamping groove, the guide plate and the saw chain are positioned, and specifically, the rear movement in the horizontal direction is limited, so that the positioning structure of the saw chain assembly is significantly simplified, the effective positioning of the saw chain assembly can be ensured under the premise of simple structure, the assembly process is simplified, the time consumption is shortened, the efficiency is improved, the labor cost can be correspondingly controlled, the quality of the cut parts can be significantly improved through the positioning of the saw chain assembly, the design requirements can be ensured, the saw chain jamming phenomenon is reduced, the working efficiency is improved, meanwhile, the saw chain and the guide plate are not easy to be pulled out even in high-speed movement, the safety hidden danger is reduced, and the service life of the saw chain and the guide plate can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic view of the electric chain saw of the utility model;

[0020] Figure 2 is the structure schematic view of the saw chain assembly and the cover plate of the casing of the electric chain saw of the utility model when the cover plate is separated;

[0021] Figure 3 is the A part enlarged structure schematic view of the electric chain saw of the utility model; Figure 2

[0022] Figure 4 is the structure schematic view of the saw chain assembly and the cover plate of the casing of the electric chain saw of the utility model when the cover plate is separated;

[0023] Figure 5 is the B part enlarged structure schematic view of the electric chain saw of the utility model; Figure 4 ​​

[0024] Figure 6 is the cross-sectional structure schematic view of the electric chain saw of the utility model;

[0025] Figure 7 is the C part enlarged structure schematic view of the utility model Figure 6 ;

[0026] Figure 8 is the structure schematic view when the upper shell, the cover plate and the guard plate of the saw chain assembly, the casing of the electric chain saw of the utility model are separated;

[0027] Figure 9 is the structure schematic view when the lower shell of the electric chain saw of the utility model is separated;

[0028] Figure 10 is the cross-sectional structure schematic view of the electric chain saw of the utility model from another perspective;

[0029] Figure 11 is the D part enlarged structure schematic view of the utility model Figure 10 ;

[0030] Figure 12 is the overall structure schematic view of the thread sleeve of the electric chain saw of the utility model.

[0031] As shown in the figure:

[0032] 1, casing;101, upper shell;101a, mounting cavity;101b, stop block;101c, communication passage;101d, mounting seat;102, lower shell;103, cover plate;104, guard plate;105, anti-skid sleeve;2, motor;3, control assembly;301, control circuit board;302, power supply;303, power switch;304, safety switch;305, power indicator;4, driving assembly;401, driving gear;402, driven gear;403, rolling bearing;404, transmission shaft;5, saw chain assembly;501, guide plate;501a, lock hole;501b, positioning long hole;502, saw chain;503, sprocket;6, first locking bolt;7, locking block;701, screw hole;8, second locking bolt;9, thread sleeve;901, anti-skid line;10, knob;1001, spigot;1002, locking and unlocking mark. DETAILED DESCRIPTION

[0033] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0034] In the description of the utility model, it is necessary to explain that the directions or position relations of the terms "upper", "lower", "left", "right", "inner", "outer" and the like are based on the directions or position relations shown in the drawings, or the directions or position relations of the utility model product when it is usually placed, and are only for the convenience of simplifying the description, and do not indicate or imply that the directions must have specific directions and specific direction structures and operations, so it cannot be understood as the limitation of the utility model.

[0035] As Figures 1 to 7The utility model relates to a single hand electric chain saw with combined positioning structure, it includes casing 1, motor 2, control assembly 3, drive assembly 4 and saw chain combination 5, motor 2 is located on the outer wall of casing 1, its output end penetrates to the inside of casing 1, control assembly 3, drive assembly 4 and saw chain combination 5 are installed in casing 1, saw chain combination 5 includes guide plate 501, saw chain 502 and sprocket 503, guide plate 501 and sprocket 503 are arranged side by side, saw chain 502 is surrounded on the outer periphery of guide plate 501 and sprocket 503, guide plate 501 plays the role of lining to saw chain 502, makes saw chain 502 keep the shape that is matched with its appearance, sprocket 503 is used for driving saw chain 502, of course, sprocket 503 is connected with drive assembly 4, drive assembly 4 is connected with the output end of motor 2, motor 2 is controlled by control assembly 3, the above-mentioned setting is the conventional setting of existing electric chain saw, so it is not repeated, especially, it still includes first locking bolt 6 and locking block 7, the installation cavity 101a is set up in casing 1, first locking bolt 6 and locking block 7 are all installed in installation cavity 101a, installation cavity 101a has certain length, this allows first bolt to move in its inside, and locking block 7 and first locking bolt 6 are connected with each other by screw thread, when first locking bolt 6 rotates, will along installation cavity 101a moves, and locking block 7 is pressed on the inner wall of installation cavity 101a, or removes its pressed state, locking hole 501a is set up on guide plate 501, locking hole 501a penetrates the upper and lower end surfaces of guide plate 501, locking hole 501a is opposite up and down with installation cavity 101a, saw chain 502 is composed of a plurality of parallel articulated links, the top of locking block 7 passes through locking hole 501a and is inserted with guide plate 501, when first locking bolt 6 locks, can be tightly matched with the inner wall of locking hole 501a by the self-locking nature of screw thread connection, the positioning of guide plate 501 and saw chain 502 is carried out, specifically, the horizontal movement of guide plate 501 and saw chain 502 is limited, the positioning structure of saw chain combination 5 is significantly simplified, under the premise of simple structure, still can ensure that saw chain combination 5 is effectively positioned, thereby make the assembly process simple, time consumption shortens, efficiency promotes, manual cost can also be controlled accordingly, and the positioning of saw chain combination 5 can significantly improve the quality of cut parts, ensure that it meets the design requirements, and reduce the emergence of saw chain 502 jamming phenomenon, improve work efficiency, at the same time, even when high-speed motion is not easy to come out, reduce the security risk, in addition, the service life of saw chain 502 and guide plate 501 can be extended.

[0036] As Figure 2 And Figure 3As shown, the inner wall of the mounting cavity 101a is formed with a stopper 101b, which divides the mounting cavity 101a into two cavities, and a communication passage 101c is formed in the stopper 101b, which communicates the two cavities, and the diameter of the communication passage 101c matches the threaded segment of the first locking bolt 6, the threaded segment of the first locking bolt 6 is screwed with the locking block 7 through the communication passage 101c, and the head segment is limited by the stopper 101b after the first positioning bolt moves a certain distance, that is, the first locking bolt 6 has a maximum moving stroke, avoiding the first locking bolt 6 moving out of position.

[0037] As shown in Figure 6 and Figure 7 , the locking block 7 is provided with a threaded hole 701 opposite to the first locking bolt 6, and the threaded segment of the first locking bolt 6 is screwed in the threaded hole 701, so that the first locking bolt 6 is screwed with the locking block 7, and the first locking bolt 6 converts the rotating action into a pushing force to the locking block 7, so that the locking block 7 can press the guide plate 501 and the saw chain 502, and the limiting effect is more stable.

[0038] As shown in Figure 1 , Figure 2 , Figure 8 , Figure 10 and Figure 11 , it further comprises a second locking bolt 8, a threaded sleeve 9 and a knob 10, the guide plate 501 is provided with a positioning long hole 501b, which is a through hole consistent with the lock hole 501a, penetrating the upper and lower end faces of the guide plate 501, the threaded segment of the second locking bolt 8 passes through the positioning long hole 501b from bottom to top and is screwed with the threaded sleeve 9, and the knob 10 is arranged on the threaded sleeve 9, it can be understood that the knob 10, the threaded sleeve 9 and the second positioning bolt are arranged in sequence from top to bottom, and the knob 10 drives the threaded sleeve 9 to rotate when rotating, so that the threaded sleeve 9 can be tightly pressed on the guide plate 501 by using the self-locking property of the threaded connection, and the guide plate 501 is positioned in the vertical and horizontal direction, and the positioning can be released when rotating in the opposite direction, the above-mentioned arrangement still simplifies the positioning structure, in addition, the knob 10 can be rotated by hand during assembly, so that it is not necessary to use additional tools, which greatly facilitates the assembly.

[0039] As shown in Figures 10 to 12As shown, the bottom of the knob 10 is formed with a spigot 1001, the threaded sleeve 9 is inserted into the spigot 1001 and is in interference fit with the spigot 1001, so that the knob 10 and the threaded sleeve 9 are stably connected and are prevented from loosening, and the outer peripheral wall of the threaded sleeve 9 is further formed with anti-skid lines 901, which can increase the friction between the spigot 1001 and the threaded sleeve 9 when the knob 10 rotates, so as to prevent the knob 10 from slipping when it rotates and to ensure that the knob 10 can effectively transmit the rotating action to the threaded sleeve 9.

[0040] As shown in Figure 1 and Figure 8 , the outer wall of the knob 10 is provided with locking and unlocking marks 1002, including arrow indicating marks, locking marks and unlocking marks, so that the rotating direction of the knob 10 can be determined intuitively when it is assembled, the guide plate 501 can be quickly pressed and positioned by the threaded sleeve 9, and the positioning can also be quickly released.

[0041] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 8 , the shell 1 includes an upper shell 101, a lower shell 102, a cover plate 103 and a guard plate 104, the outer wall of the front part of the upper shell 101 is formed with a mounting seat 101d, the mounting seat 101d is a surrounding plate formed on the outer wall of the upper shell 101 and a flat area surrounded by the surrounding plate, the saw chain assembly 5 is mounted on the mounting seat 101d, a mounting cavity 101a is formed on the mounting seat 101d, the cover plate 103 is arranged on the rear part of the saw chain assembly 5, so as to shield the rear part of the chain wheel 503, the guide plate 501 and the rear part of the saw chain 502, so that the saw chain assembly 5 can be protected, and the cover plate 103 is fixed with the mounting seat 101d, the guard plate 104 is hinged to the upper shell 101 and covers the upper part of the saw chain assembly 5, so as to avoid that the top part of the saw chain 502 is exposed to the outside space, to reduce the possibility that the high-speed rotating saw chain 502 of the electric chain saw hurts the user and to improve the safety in use, the motor 2 is arranged on the inner bottom part of the lower shell 102, and the control assembly 3 and the driving assembly 4 are arranged between the upper shell 101 and the lower shell 102.

[0042] As shown in Figure 1 and Figure 2 , the shell 1 further includes an anti-skid sleeve 105, which is sleeved on the rear part of the upper shell 101 and the lower shell 102, that is, on the handle of the shell 1, and the material of the anti-skid sleeve 105 is rubber or silica gel, so that the user can stably hold it and avoid slipping.

[0043] As shown in Figure 1 and Figure 8As shown, the control assembly 3 comprises a control circuit board 301, a power supply 302, a power switch 303, a safety switch 304 and an electric quantity indicator lamp 305, the power supply 302, the power switch 303, the safety switch 304, the electric quantity indicator lamp 305 and the motor 2 are electrically connected with the control circuit board 301, the control circuit board 301 is provided with a control chip, and the power switch 303 and the safety switch 304 are arranged on the outer wall of the shell 1, the power switch 303 and the safety switch 304 are both press-type switches in the utility model, after the safety switch 304 is pressed, the motor 2 is controlled to run by the control chip on the control circuit board 301 through pressing the power switch 303, so as to drive the driving assembly 4 to drive the saw chain assembly 5, the power supply 302 supplies power to the whole circuit, the electric quantity indicator lamp 305 is used for displaying the residual power of the power supply 302, the safety switch 304 can avoid the motor 2 from running in the case that the power switch 303 is pressed by mistake, and further improve the safety of use.

[0044] As shown in the figure, Figures 8 to 10 As shown, the driving assembly 4 comprises a driving gear 401, a driven gear 402, a rolling bearing 403 and a transmission shaft 404, the driving gear 401 is sleeved on the output end of the motor 2 and is directly driven by the motor 2, the driven gear 402 is arranged on one side of the driving gear 401 and is engaged with the driving gear 401, the lower end of the transmission shaft 404 is connected with the rolling bearing 403, the upper end of the transmission shaft 404 penetrates through the driving gear 401 and is connected with the sprocket 503, and the cooperation surface shape of the transmission shaft 404 and the sprocket 503 is non-circular, so that the transmission shaft 404 can keep synchronous rotation with the driven gear 402 and transmit the rotation to the sprocket 503, so that the saw chain 502 is driven to cut by the sprocket 503.

[0045] In combination with Figures 1 to 12The electric chain saw of the utility model positions the guide plate 501 and the saw chain 502 of the saw chain assembly 5 by the first locking bolt 6 and the locking block 7 in front and back when the electric chain saw is rotating and distributing, and the guide plate 501 is positioned up and down in the vertical and horizontal plane by the second locking bolt 8, the threaded sleeve 9 and the knob 10 simultaneously, specifically, the first locking bolt 6 is moved in the installation cavity 101a by rotating, thereby driving the locking block 7 which is threadedly connected with the first locking bolt 6 to exert pressure on the inner wall of the locking hole 501a of the guide plate 501, so as to limit the rear movement of the guide plate 501 and the saw chain 502 in the horizontal direction, and the guide plate 501 and the saw chain 502 are positioned in front and back, the up and down positioning of the guide plate 501 in the vertical and horizontal plane is realized by rotating the knob 10, the threaded sleeve 9 is synchronously rotated by the insertion tube 1001 of the knob 10 when the knob 10 is rotating, the threaded sleeve 9 is moved up and down along the second locking bolt 8, thereby the self-locking property of the threaded connection is utilized, the threaded sleeve 9 can be tightly pressed on the guide plate 501, and the guide plate 501 is positioned in the vertical and horizontal direction, when in use, the user only needs to press the safety switch 304 first, and then the motor 2 is controlled to run by the control chip on the control circuit board 301 through the touch pressure power switch 303, the motor 2 drives the driving gear 401 to rotate, the driving gear 401 drives the engaged driven gear 402 to rotate, the driven gear 402 drives the transmission shaft 404 to rotate, the lower end of the transmission shaft 404 is supported by the rolling bearing 403, so that the abrasion can be reduced, the upper end drives the chain wheel 503 to rotate, and the chain wheel 503 drives the saw chain 502 to transmit and cut.

[0046] The above embodiments and descriptions are only to illustrate the principles and the best embodiments of the utility model, and the utility model can have various changes and improvements without departing from the spirit and the scope of the utility model, and these changes and improvements all fall within the scope of the utility model which is claimed to be protected.

Claims

1. A single-handed electric chainsaw with a combined positioning structure, comprising a housing (1), a motor (2), a control assembly (3), a drive assembly (4), and a saw chain assembly (5), wherein the motor (2) is disposed on the outer wall of the housing (1), the control assembly (3), the drive assembly (4), and the saw chain assembly (5) are installed in the housing (1), and the saw chain assembly (5) comprises a guide plate (501), a saw chain (502), and a sprocket (503), characterized in that, It further comprises a first locking bolt (6) and a locking block (7), the casing (1) is provided with a mounting cavity (101a), the first locking bolt (6) and the locking block (7) are both mounted in the mounting cavity (101a), and the locking block (7) is threadedly connected with the first locking bolt (6), the guide plate (501) is provided with a locking hole (501a), and the saw chain (502) is provided with a clamping groove between adjacent chain links, the top of the locking block (7) passes through the clamping groove opposite to the locking hole (501a) and extends into the locking hole (501a).

2. A single-handed electric chain saw having a combined positioning structure according to claim 1, wherein The inner wall of the mounting cavity (101a) is provided with a stop block (101b), the stop block (101b) is provided with a communication channel (101c), and the threaded segment of the first locking bolt (6) passes through the communication channel (101c) and is threadedly connected with the locking block (7).

3. A single-handed electric chain saw having a combined positioning structure according to claim 2, wherein The locking block (7) is provided with a threaded hole (701), the threaded hole (701) is opposite to the first locking bolt (6), and the threaded segment of the first locking bolt (6) is threadedly connected in the threaded hole (701).

4. A single-hand electric chain saw having a combined positioning structure according to any one of claims 1 to 3, characterized in that, It further comprises a second locking bolt (8), a threaded sleeve (9) and a knob (10), the guide plate (501) is provided with a positioning long hole (501b), the threaded segment of the second locking bolt (8) passes through the positioning long hole (501b) from bottom to top and is threadedly connected with the threaded sleeve (9), and the knob (10) is arranged on the threaded sleeve (9).

5. A single-handed electric chain saw having a combined positioning structure according to claim 4, wherein The bottom of the knob (10) is provided with a pipe (1001), the threaded sleeve (9) is inserted into the pipe (1001) and is in interference fit with the pipe (1001), and the outer peripheral wall of the threaded sleeve (9) is further provided with an anti-skid pattern (901).

6. A single-handed electric chain saw having a combined positioning structure according to claim 5, wherein The outer wall of the knob (10) is provided with locking and unlocking marks (1002).

7. A single-handed electric chain saw having a combined positioning structure according to any one of claims 1, 2, 3, 5 or 6, characterized in that, The casing (1) comprises an upper casing (101), a lower casing (102), a cover plate (103) and a guard plate (104), the outer wall of the front portion of the upper casing (101) is provided with a mounting seat (101d), the saw chain assembly (5) is mounted on the mounting seat (101d), the cover plate (103) is arranged on the rear portion of the saw chain assembly (5) and is fixed with the mounting seat (101d), the mounting cavity (101a) is arranged on the mounting seat (101d), the guard plate (104) is hinged to the upper casing (101) and covers the saw chain assembly (5) from above, the motor (2) is arranged at the bottom of the lower casing (102), and the control assembly (3) and the driving assembly (4) are both arranged between the upper casing (101) and the lower casing (102).

8. A single-handed electric chain saw having a combined positioning structure according to claim 7, wherein The casing (1) further comprises an anti-skid sleeve (105), and the anti-skid sleeve (105) is arranged on the rear portion of the upper casing (101) and the lower casing (102).

9. A single-handed electric chain saw having a combined positioning structure according to any one of claims 1, 2, 3, 5, 6 or 8, characterized in that, The control assembly (3) comprises a control circuit board (301), a power supply (302), a power switch (303) and a safety switch (304), the power supply (302), the power switch (303), the safety switch (304) and the motor (2) are electrically connected with the control circuit board (301), and the power switch (303) and the safety switch (304) are arranged on the outer wall of the shell (1).

10. A single-handed electric chain saw having a combined positioning structure according to claim 9, wherein The driving assembly (4) comprises a driving gear (401), a driven gear (402), a rolling bearing (403) and a transmission shaft (404), the driving gear (401) is sleeved on the output end of the motor (2), the driven gear (402) is arranged on one side of the driving gear (401) and is engaged with the driving gear (401), the lower end of the transmission shaft (404) is connected with the rolling bearing (403), the upper end of the transmission shaft (404) penetrates through the driving gear (401) and is connected with the chain wheel (503), and the cooperation surface shape of the transmission shaft (404) and the chain wheel (503) is non-circular.

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