CN210435477U

CN210435477U - Chain tensioning and adjusting mechanism of electric chain saw

Info

Publication number: CN210435477U
Application number: CN201921411933.4U
Authority: CN
Inventors: 周美
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-05-01
Anticipated expiration: 2029-08-28

Abstract

The utility model relates to a chain tensioning and adjusting mechanism of an electric chain saw in the technical field of electric chain saws, which comprises a rotary switch, an adjusting turntable, a pushing block, a chain guide plate, a chain wheel, a power transmission plate and a bearing shell; the two opposite surfaces of the adjusting turntable are respectively provided with a spiral wheel groove, a star gear and a T-shaped cylinder; the pushing block is provided with a step-shaped clamping groove and an arc shifting piece, the end part of the T-shaped barrel is clamped on the clamping groove, and the arc shifting piece is in adaptive clamping connection with the spiral wheel groove; the pushing block is connected to the end part of the chain guide plate; the central axis of the power transmission plate is respectively connected with a fixed shaft and a rotating shaft, and the fixed shaft sequentially penetrates through the chain guide plate, the pushing block and the adjusting turntable and then is connected with the rotating switch; the rotating shaft is connected with a transmission gear and a chain wheel, the power transmission plate is connected to the upper part of the bearing shell, and the transmission gear is positioned in the bearing shell. The utility model discloses the mode of the regulation electric saw chain of straight pushing-type has changed into screw propulsion for adjust compact structure, degree of regulation is controllable and convenient operation.

Description

Chain tensioning and adjusting mechanism of electric chain saw

Technical Field

The utility model relates to an electricity chain saw technical field specifically, relates to an electricity chain saw chain tensioning adjustment mechanism.

Background

The electric chain saw is a tool frequently used in the felling industry of people at present, and the electric chain saw is developed to be a cutting tool which takes electricity as power and is used for cutting timber, stone, steel and the like, so that the time and labor consumed by cutting materials are greatly saved. The saw blade of the electric saw is generally divided into a plurality of types, such as a round type, a strip type, a chain type and the like.

The tensioning of the chain of current electric chain saw is adjusted with relaxing, perhaps practical straight word screwdriver adjusts, perhaps the practicality pushes up the straight pushing-type that pushes down and adjusts the rate of tension of electric chain saw chain, and it is very inconvenient to use, and the regulation degree is also not well controlled, causes chain life greatly reduced to also influence the stability of fuselage performance.

Found through prior art retrieval, chinese utility model patent publication is CN203944923U, the name is an electric chain saw that can manual regulation saw blade rate of tension, it includes the electric saw fuselage, the power supply, the baffle, side cap and chain, its characteristics are, still include manual overspeed device tensioner, manual overspeed device tensioner is including drawing tight nail, the screw rod, pinion and apron, be equipped with the card hole of a chucking drawing tight nail on the baffle, be equipped with one on the drawing tight nail with the axle center vertically screw hole of drawing tight nail, screw rod threaded connection is in the screw hole of drawing tight nail, pinion and screw rod meshing, the pinion runs through the side cap and cup joints the knob at the tip, manual overspeed device tensioner compress tightly through the apron, the apron passes through the apron screw installation on the side cap. But this utility model still uses the straight pushing-type mode when adjusting the electric saw chain rate of tension, and degree of regulation is not well controlled.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing an electricity chain saw chain tensioning adjustment mechanism.

According to the utility model, the chain tension adjusting mechanism of the electric chain saw comprises a rotary switch, an adjusting turntable, a pushing block, a chain guide plate, a chain wheel, a power transmission plate and a bearing shell;

the two opposite surfaces of the adjusting turntable are respectively provided with a spiral wheel groove and a star-shaped gear, a T-shaped cylinder is arranged on the axis of the adjusting turntable, a groove is formed between the end part of the T-shaped cylinder and a central platform of the spiral wheel groove, and the rotary switch is provided with a rotary column matched with the star-shaped gear;

the pushing block is U-shaped, a step-shaped clamping groove is formed in the inner side of the pushing block, an arc shifting piece is arranged at the end of the central axis of the pushing block, the end of the T-shaped cylinder is clamped on the clamping groove, and the arc shifting piece is clamped with the spiral wheel groove in a matched mode;

the end part of the chain guide plate is provided with a U-shaped groove, and the pushing block is connected to the end part of the chain guide plate;

the central axis of the power transmission plate is respectively connected with a fixed shaft and a rotating shaft, and the fixed shaft sequentially penetrates through the chain guide plate, the pushing block and the adjusting turntable and then is connected with the rotating switch; the transmission shaft is connected with a transmission gear and the chain wheel, the chain wheel and the transmission gear are respectively positioned on two sides of the power transmission plate, the power transmission plate is fixed on the upper portion of the bearing shell, and the transmission gear is positioned in the bearing shell.

In some embodiments, the sprocket is provided with a D-shaped hole, and the rotating shaft is provided with a D-shaped bearing adapted to the D-shaped hole.

In some embodiments, the pushing block is provided with a convex block, the convex block is a cylinder, a D-shaped cylinder or a conical cylinder, and the chain guide plate is provided with a fixing hole matched with the convex block.

In some embodiments, the chain guide is provided with a plurality of sets of fixing holes along the axial direction, and the axial distance of each set of fixing holes is the same.

In some embodiments, the power transmission plate is provided with an integrally formed cushion block, the cushion block and the chain wheel are located in the same horizontal plane of the power transmission plate, the fixing shaft penetrates through the cushion block, and the shape of the cushion block is matched with that of the end part of the chain guide plate.

In some embodiments, a U-shaped bar block is arranged on the cushion block, the U-shaped bar block is matched with the U-shaped groove on the chain guide plate, and the fixing shaft penetrates through the U-shaped bar block.

In some embodiments, the end of the rotating shaft is provided with a rolling bearing, the rolling bearing and the transmission gear are located on the same side of the power transmission plate, the transmission gear is located between the rolling bearing and the power transmission plate, and a groove matched with the rolling bearing is formed in the bearing shell.

In some embodiments, an elastic gasket is arranged between the transmission gear and the rolling bearing, and the elastic gasket is an oil-resistant soft plastic gasket.

In some embodiments, the power transmission plate is provided with a plurality of sets of fixing screw holes, the fixing screw holes are boss-shaped screw holes, and the bearing shell is provided with an internal thread hole matched with the fixing screw holes.

In some embodiments, the stressed shell position fiber plastic shell.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses the mode of the regulation electric saw chain of direct pushing-type has changed into screw propulsion formula, not only makes to adjust compact structure, and screw propulsion's accommodate mode makes the regulation precision more advanced one step more simultaneously, and degree of regulation is controllable and convenient operation.

2. The utility model discloses a redundant design to the fixed orifices on the chain guide can carry out the regulation of many gears to the chain, can effectively deal with the situation of carrying out the short circuit after the chain damages simultaneously, imitates the life who prolongs the chain guide.

3. The utility model discloses a U type strip piece that the setting has direction and limiting displacement leads and spacing to the advancing direction of chain guide, prevents to rock about the chain guide, improves the quality and the effect that the brick was cut to the electric saw chain.

4. The utility model discloses a be fixed in the middle part of axis of rotation with drive gear, the tip reconnection of its axis of rotation is with antifriction bearing to set up on the load casing with the recess that has spacing and fixed action of antifriction bearing looks adaptation, make drive gear after receiving the torsion that motor output shaft given, can rely on antifriction bearing and recess interact between them effectively to decompose and offset the eccentric moment of torsion that the axis of rotation received, ensure the degree of stability of axis of rotation.

5. The utility model discloses a drive gear with set up anti oily soft plastic gasket between the antifriction bearing, ensure the fastening nature that antifriction bearing and recess both are connected, further improve the output stability of the moment of axis of rotation.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of the adjusting turntable with a star-shaped gear;

FIG. 3 is a schematic structural view of the side of the adjusting turntable with the spiral wheel groove of the present invention;

FIG. 4 is a schematic view of the three-dimensional structure of the adjusting turntable of the present invention;

FIG. 5 is a schematic structural view of the pushing block of the present invention with an arc-shaped shifting piece;

FIG. 6 is a schematic structural view of the pushing block with a slot;

FIG. 7 is a schematic view of a planar structure of the power pushing block of the present invention;

fig. 8 is a schematic perspective view of the power pushing block of the present invention;

fig. 9 is a schematic structural view of the force-bearing shell of the present invention;

fig. 10 is a schematic view of the plane structure of the rotary switch of the present invention;

fig. 11 is a schematic structural view of the chain guide of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

The utility model provides a chain tensioning and adjusting mechanism of an electric chain saw, which comprises a rotary switch 1, an adjusting turntable 2, a pushing block 3, a chain guide plate 4, a chain wheel 5, a power transmission plate 6 and a force bearing shell 7, as shown in figures 1-11;

the two opposite surfaces of the adjusting turntable 2 are respectively provided with a spiral wheel groove 21 and a star-shaped gear 22, the axis of the adjusting turntable 2 is provided with a T-shaped cylinder 23, the T-shaped cylinder 23 is preferably a hollow body, the end part of the T-shaped cylinder 23 and a central platform of the spiral wheel groove 21 form a groove, and the rotary switch 1 is provided with a rotary column 11 matched with the star-shaped gear 22; the spiral wheel groove 21 is provided with a channel inlet at the outermost side of the adjusting turntable 2, so that the arc-shaped shifting piece 32 can conveniently enter and exit, the spiral wheel groove 21 is provided with a limit stop at the center of the adjusting turntable 2, namely, the spiral groove of the spiral wheel groove 21 stops at the center of the adjusting turntable 2, the stopping point is the position flush with the outer diameter edge of the end part with the larger diameter of the T-shaped cylinder, and when the adjusting turntable 2 drives the arc-shaped shifting piece 32 to rotate to the stopping point position, namely, the minimum stroke of the chain guide plate 4, namely, the electric saw chain on the chain guide plate 4 is in the maximum loose state; the rotary switch 1 is a rotary disc type switch, a rotary handle is arranged outside the rotary switch, a rotary column 11 which is matched with the star-shaped gear 22 and is arranged on the inner side surface of the rotary switch is provided with at least one rotary shaft 11, preferably a plurality of rotary shafts 11 are arranged, so that after the rotary shafts 11 are inserted into gear grooves of the star-shaped gear 22, the rotary handle can easily rotate the adjusting rotary disc 2, the further symmetrical arrangement is adopted, and the symmetry can be centrosymmetric or triangular symmetric.

The pushing block 3 is U-shaped, the inner side of the pushing block 3 is provided with a step-shaped clamping groove 31, the end part of the central axis of the pushing block 3 is provided with an arc-shaped shifting piece 32, the end part of the T-shaped cylinder is clamped on the clamping groove 31, and the arc-shaped shifting piece 32 is in adaptive clamping connection with the spiral wheel groove 21; the arc-shaped shifting piece 32 and the clamping groove 31 are respectively positioned on two sides of the pushing block 3;

the end part of the chain guide plate 4 is provided with a U-shaped groove, and the pushing block 3 is connected to the end part of the chain guide plate 4; the U-shaped groove formed in the chain guide plate 4 is matched with the U-shaped shape of the pushing block 3, the opening width of the U-shaped groove in the chain guide plate 4 is larger than or equal to the width of the U-shaped opening of the pushing block 3, preferably larger than the width of the U-shaped opening of the pushing block 3, when the chain guide plate moves forwards and backwards around a shaft, the contact with the shaft can be reduced as much as possible, and the phenomena of structural shell clamping and the like caused by friction or collision are reduced; the chain guide plate 4 is a standard part, the edge of the chain guide plate is provided with a groove for fixing a chain, the pushing block 3 can be fixed at one end of the chain guide plate 4, which is provided with a U-shaped groove, by screws, and the pushing block and the chain guide plate can also be fixedly connected by means of welding and the like;

the central axis of the power transmission plate 6 is respectively connected with a fixed shaft 61 and a rotating shaft 62, and the fixed shaft 61 sequentially penetrates through the chain guide plate 4, the pushing block 3 and the adjusting turntable 2 and then is connected with the rotating switch 1; the rotating shaft 62 is connected with a transmission gear 63 and the chain wheel 5, the chain wheel 5 and the transmission gear 63 are respectively positioned on two surfaces of the power transmission plate 6, the power transmission plate 6 is fixed on the upper part of the bearing shell 7, and the transmission gear 63 is positioned in the bearing shell 7. Two holes are formed in the central axis of the power transmission plate 6, a bearing is fixedly arranged in one hole which is close to the electric saw engine, the rotating shaft 62 penetrates through the bearing and then is fixed, the rotating shaft 62 can be connected in an interference fit mode, meanwhile, the rotating shaft 62 and the transmission gear 63 are fixedly connected through the bearing, the transmission gear 63 is in meshing transmission with a power output shaft of the engine, the optimal transmission gear adopts a helical gear, transmission torque is large, and the transmission gear cannot be easily damaged. Sprocket 5 middle part is equipped with the race that meshes with the electric saw chain mutually, sprocket 5's height and chain guide 4 highly keep level basically, sprocket 5's radial central axis and chain guide 4's axis coincide mutually, after the electric saw chain adds on sprocket 5 and chain guide 4 promptly, the inclined pivoted condition can not appear in the electric saw chain, it is preferred, chain guide 4's tip is when advancing to sprocket 5's direction, chain guide 4 is located between the upper and lower two sides of sprocket 5, can guarantee like this that the rotation of electric saw chain is on same horizontal plane, reduce the problem of electric saw chain slippage, protect the operator to avoid the injury.

Right the utility model discloses electric saw chain tensioning adjustment mechanism's operation principle explains as follows:

if the electric saw is loosened after working for a period of time, the rotating column 11 in the rotating switch 1 drives the star-shaped gear 22 to rotate by manually or electrically rotating the rotating switch 1, the spiral wheel groove 21 carries the arc-shaped shifting piece 32 on the pushing block 3 to generate rotary displacement, and then the pushing block 3 drives the chain guide plate 4 to move forwards in the direction departing from the chain wheel 5, so that the axial distance of the electric saw chain is adjusted and increased, and the electric saw chain is in a tensioned state;

conversely, if the electric saw chain needs to be adjusted to be in a loose state, the rotating switch is rotated reversely, and finally the pushing block 3 drives the chain guide plate 4 to advance towards the direction close to the chain wheel 5, so that the axial distance of the electric saw chain is adjusted and reduced, and the electric saw chain is in the loose state.

Preferably, the rotary switch 1 is rotated clockwise to adjust the tension of the chain of the electric saw, and is rotated counterclockwise to adjust the slack of the chain of the electric saw, in order to meet the behavioral habits of most people.

The utility model discloses the mode of the regulation electric saw chain of direct pushing-type has changed into screw propulsion formula, not only makes to adjust compact structure, and screw propulsion's accommodate mode makes the regulation precision more advanced one step more simultaneously, and degree of regulation is controllable and convenient operation.

The sprocket 5 is provided with a D-shaped hole, and the rotating shaft 62 is provided with a D-shaped bearing matched with the D-shaped hole. Sprocket 5 sets up to D shape hole and is connected the back with the D type bearing that is fixed in on the axis of rotation 62, can effectively increase sprocket 5's transmission power, for the relation of connection that both formed with the face of cylinder and through interference fit among the prior art, eliminated the phenomenon that the sprocket skidded. Further, the chain wheel 5 is fixed on the D-shaped bearing of the rotating shaft 62 in a spot welding manner, so that the chain wheel 5 and the D-shaped bearing are integrated, and the disassembly and assembly work is convenient.

The pushing block 3 is provided with a convex block 33, the convex block 33 is a cylinder, a D-shaped cylinder or a conical cylinder, and the chain guide plate 4 is provided with a fixing hole 41 matched with the convex block 33. After the protruding block 33 is matched and connected with the fixing hole 41, the pushing block 3 is fixedly connected with the chain guide plate 4. At least one lug 33 is arranged on the pushing block 3, preferably, one lug 33 is respectively arranged on two side plates of the U-shaped pushing block 3, an internal thread is arranged on at least one lug 33, the fixing hole 41 of the chain guide plate 4 is arranged into a T-shaped hole, namely, a stepped hole, the screw rod part of the screw penetrates through the fixing hole 41 and then is connected with the internal thread of the lug boss 33, and the screw nut part of the screw is positioned on the step of the fixing hole 41, so that the two are fixedly connected. Further, under the condition that has a plurality of lugs 33, can set the lug to different shapes, set cylindrical lug on the curb plate of the U-shaped board that promotes piece 3, D type or toper cylinder are set to what another curb plate is relative, when convenient discernment installation, because different shape structure, the stress point is not on same horizontal plane, but greatly reduced is because of the friction damage that vibrations or other reasons lead to, increases the firmness of both connections.

The chain guide 4 is provided with a plurality of groups of fixing holes 41 along the axial direction, and the axial distances of the fixing holes 41 in each group are the same. In the use process of the electric saw, because the stress of the chain guide plate 4 is large, the fixing hole 41 which is in adaptive connection with the lug 33 is often damaged, the service life of the chain guide plate 4 can be effectively prolonged through the redundant design of the fixing hole 41, and meanwhile, the chain can be adjusted in multiple gears.

The power transmission plate 6 is provided with an integrally formed cushion block 64, the cushion block 64 and the chain wheel 5 are located in the same horizontal plane of the power transmission plate 6, the fixing shaft 61 penetrates through the cushion block 64, and the shape of the cushion block 64 is matched with that of the end part of the chain guide plate 4. A cushion block 64 which is integrally formed and has a horizontal end face higher than the horizontal plane of the power transmission plate 6 is arranged on the power transmission plate 6, the fixing shaft 61 penetrates through the central axis of the cushion block 64, and the height of the cushion block 64 is mainly determined according to the height of the chain wheel 5 from the power transmission plate 6. In the electric saw working process, if the distance between the horizontal end face of sprocket 5 and the horizontal end face of power transmission board 6 is too close, the electric saw chain rotates the in-process, set screw or other protrusions on the chain can hardly appear and contact with power transmission board 6 and cause damage between them, for this reason, cushion 64 can improve the horizontal plane distance of chain baffle 4 and power transmission board 6, and then can improve the height of sprocket 5 to the degree that is enough with the phase separation of chain and power transmission board 6, avoid both to produce the collision.

The cushion block 64 is provided with a U-shaped strip block 641, the U-shaped strip block 641 is matched with a U-shaped groove in the chain guide plate 4, and the fixing shaft 61 penetrates through the U-shaped strip block 641. Set up on cushion 64 with the U type strip piece 641 of the U type groove looks adaptation on chain guide 4, when making chain guide 4 can directly pass fixed axle 61 and sit on cushion 64, U type groove looks adaptation ground joint on U type strip piece 641 on the chain guide, at this moment, U type strip piece 641 not only plays good guide effect when adjusting chain guide 4, and at electric saw chain during operation, can play good limiting displacement to chain guide 4, prevent that chain guide 4 from rocking about, improve the quality and the effect that the brick was cut to the electric saw chain. Meanwhile, the fixing shaft 61 passes through the U-shaped bar block 641, and a section of U-shaped bar block 641 is arranged in the direction of the fixing shaft 61 facing the rotating shaft 62, and the section of U-shaped bar block is marked as 641', so that when the chain guide 4 is adjusted to move in the direction away from the chain wheel 5, the end of the pushing block 3 can be protected from being contacted with the fixing shaft 61, and the collision damage to the fixing shaft 61 can be avoided.

The end part of the rotating shaft 62 is provided with a rolling bearing 65, the rolling bearing 65 and the transmission gear 63 are positioned on the same side of the power transmission plate 6, the transmission gear 63 is positioned between the rolling bearing 65 and the power transmission plate 6, and a groove 71 matched with the rolling bearing 65 is arranged in the bearing shell 7. During the operation of the electric saw, the problem that the rotating shaft 62 is broken under the condition of eccentric moment is often caused only by the fixing action of the power transmission plate 6 on the rotating shaft 62. The utility model discloses a be fixed in the middle part of axis of rotation 62 rather than the bottom with drive gear 63, a antifriction bearing 65 is reconnected to the bottom of its axis of rotation to set up on load casing 7 with the recess 71 that has spacing and fixed action of antifriction bearing 65 looks adaptation, make drive gear 63 after the torsion that receives the motor output shaft and give, can rely on antifriction bearing 65 and recess 71 interact between them effectively to decompose and offset the eccentric moment of torsion that axis of rotation 62 received, ensure axis of rotation 62's degree of stability.

An elastic gasket is arranged between the transmission gear 63 and the rolling bearing 65, and the elastic gasket is an oil-resistant soft plastic gasket. Grease is needed to be used as a lubricant in the process of meshing transmission of the transmission gear 63 and the motor power output shaft, the rolling bearing 65 is embedded in the groove 71, if the grease exists in the rolling bearing 65 and the groove 71, the rolling bearing 65 is easy to rotate along with the rotating shaft 62, and after a long time, a gap is formed between the rolling bearing 65 and the groove 71, so that the rotating shaft 62 cannot be well protected.

The power transmission plate 6 is provided with a plurality of groups of fixing screw holes 66, the fixing screw holes 66 are boss-shaped screw holes, and the bearing shell 7 is provided with an internal thread hole matched with the fixing screw holes 66. The boss-shaped fixing screw holes 66 and the rest force bearing shell 7 are connected so that the fastening screws cannot be higher than the horizontal plane of the power transmission plate 6, and the optimized fixing screw holes 66 can enable the end parts of the fastening screws to be positioned on the horizontal plane of the power transmission plate 6, so that the hands of a human body are prevented from being scratched when the power transmission plate is detached or inspected.

And the bearing shell is a 7-position fiber plastic shell. Bearing casing 7 is as the casing of bearing power transmission board 6 and its part at operation on power transmission board 6, and practical fiber plastics is as the casing material, can effectively alleviate the whole quality of electric saw, and bearing casing 7 adopts integrated into one piece simultaneously, is provided with many strengthening ribs in it, especially is provided with many strengthening ribs outside recess 71 to ensure recess 71's steadiness.

The rotary switch 1, the adjusting rotary disc 2, the pushing block 3, the chain guide plate 4, the chain wheel 5, the power transmission plate 6 and other parts are made of metal materials or alloy materials, and can also be made of other materials with proper hardness, such as high-molecular high-modulus compound fiber materials and the like.

In summary, the utility model changes the direct pushing type mode of adjusting the electric saw chain into the spiral pushing type mode, which not only makes the adjusting structure compact, but also makes the adjusting precision more precise and more advanced by the spiral pushing type adjusting mode, the adjusting degree is controllable and the operation is convenient; the utility model can adjust the chain with multiple gears by the redundant design of the fixing holes on the chain guide plate, and can effectively deal with the situation of short circuit after the chain is damaged, effectively prolong the service life of the chain guide plate; the utility model guides and limits the advancing direction of the chain guide plate by arranging the U-shaped strip block with guiding and limiting functions, thereby preventing the chain guide plate from shaking left and right and improving the quality and effect of brick cutting of the chain of the electric saw; the utility model fixes the transmission gear in the middle of the rotating shaft, the end part of the rotating shaft is connected with the rolling bearing, and the bearing shell is provided with the groove which is matched with the rolling bearing and has the functions of limiting and fixing, so that the transmission gear can effectively decompose and offset the eccentric torque received by the rotating shaft by the interaction of the rolling bearing and the groove after receiving the torque force given by the motor output shaft, and the stability of the rotating shaft is ensured; the utility model discloses a drive gear with set up anti oily soft plastic gasket between the antifriction bearing, ensure the fastening nature that antifriction bearing and recess both are connected, further improve the output stability of the moment of axis of rotation.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A chain tensioning and adjusting mechanism of an electric chain saw is characterized by comprising a rotary switch (1), an adjusting turntable (2), a pushing block (3), a chain guide plate (4), a chain wheel (5), a power transmission plate (6) and a bearing shell (7);

the two opposite surfaces of the adjusting turntable (2) are respectively provided with a spiral wheel groove (21) and a star-shaped gear (22), a T-shaped cylinder (23) is arranged on the axis of the adjusting turntable (2), the end part of the T-shaped cylinder (23) and a central platform of the spiral wheel groove (21) form a groove, and the rotary switch (1) is provided with a rotary column (11) matched with the star-shaped gear (22);

the pushing block (3) is U-shaped, a step-shaped clamping groove (31) is formed in the inner side of the pushing block (3), an arc-shaped shifting piece (32) is arranged at the end of the central axis of the pushing block (3), the end of the T-shaped barrel is clamped on the clamping groove (31), and the arc-shaped shifting piece (32) is in adaptive clamping connection with the spiral wheel groove (21);

the end part of the chain guide plate (4) is provided with a U-shaped groove, and the pushing block (3) is connected to the end part of the chain guide plate (4);

a fixed shaft (61) and a rotating shaft (62) are respectively connected to the central axis of the power transmission plate (6), and the fixed shaft (61) sequentially penetrates through the chain guide plate (4), the pushing block (3) and the adjusting turntable (2) and then is connected with the rotating switch (1); be connected with drive gear (63) on axis of rotation (62) with sprocket (5), sprocket (5) with drive gear (63) are located the two sides of power transmission board (6) respectively, power transmission board (6) are fixed in the upper portion of load casing (7), drive gear (63) are located in load casing (7).

2. The electric chainsaw chain tension adjustment mechanism according to claim 1, wherein the sprocket wheel (5) is provided with a D-shaped hole and the rotation shaft (62) is provided with a D-shaped bearing adapted to the D-shaped hole.

3. The electric chainsaw chain tension adjustment mechanism according to claim 1, wherein the push block (3) is provided with a cam (33), the cam (33) is a cylinder, a D-cylinder or a cone-cylinder, and the chain guide (4) is provided with a fixing hole (41) adapted to the cam (33).

4. The electric chain saw chain tension adjusting mechanism as recited in claim 3, wherein the chain guide plate (4) is provided with a plurality of sets of the fixing holes (41) along an axial direction, and axial distances of the fixing holes (41) of each set are the same.

5. The electric chainsaw chain tension adjustment mechanism according to claim 1, wherein the power transmission plate (6) is provided with an integrally formed spacer (64), the spacer (64) and the sprocket (5) are located in the same horizontal plane of the power transmission plate (6), the fixed shaft (61) passes through the spacer (64), and the shape of the spacer (64) is adapted to the shape of the end of the chain guide plate (4).

6. The chain tension adjusting mechanism of an electric chain saw as recited in claim 5, characterized in that the pad block (64) is provided with a U-shaped bar (641), the U-shaped bar (641) is adapted to the U-shaped groove of the chain guide (4), and the fixing shaft (61) penetrates through the U-shaped bar (641).

7. The electric chain saw chain tension adjusting mechanism as recited in claim 1, wherein the end of the rotating shaft (62) is provided with a rolling bearing (65), the rolling bearing (65) and the transmission gear (63) are located on the same side of the power transmission plate (6), the transmission gear (63) is located between the rolling bearing (65) and the power transmission plate (6), and a groove (71) matched with the rolling bearing (65) is arranged in the bearing housing (7).

8. The electric chainsaw chain tension adjustment mechanism according to claim 7, wherein an elastic washer is provided between the transmission gear (63) and the rolling bearing (65), the elastic washer being an oil-resistant soft plastic washer.

9. The chain tension adjusting mechanism of an electric chain saw according to claim 1, wherein the power transmission plate (6) is provided with a plurality of sets of fixing screw holes (66), the fixing screw holes (66) are boss-shaped screw holes, and the bearing housing (7) is provided with an internal thread hole matched with the fixing screw holes (66).

10. The electric chainsaw chain tension adjustment mechanism of claim 1, wherein the force bearing housing (7) is a fiber plastic housing.