Mini electric saw chain and mini electric saw

Abstract

The utility model relates to a mini electric saw chain which comprises a plurality of transmission pieces, a plurality of pin shafts, a plurality of connecting pieces and a plurality of cutting pieces. The multiple transmission pieces are arranged on the plane to form an annular structure, the cutting piece comprises a first connecting part, a depth limiting part and a cutting part, the first connecting part is located on the side face of the transmission piece, the first connecting part is connected with two adjacent transmission pieces, and the cutting part is located behind the depth limiting part. Wherein the cutting part comprises a transverse extending section, a supporting section and a cutting section, the transverse extending section comprises a first end and a second end, the first end is connected to the first connecting part, and the second end extends in the direction where the transmission piece is located. The supporting section is connected to the second end, and the supporting section is arranged close to the thickness center face of the annular structure. A knife edge is arranged on the front side of the cutting section, the cutting section comprises a third end and a fourth end, the third end is connected to the supporting section, and the fourth end extends in the direction where the first connecting part is located.

Description

Technical Field

[0001] The utility model relates to the field of electric saws, in particular to a mini electric saw saw chain and a mini electric saw. Background Art

[0002] The saw chain of an electric saw generally consists of a plurality of drive plates, a plurality of connecting plates, a plurality of cutting plates and a plurality of pins. The "L"-shaped cutting edges are arranged alternately on the saw chain of a conventional electric saw, and the cutting work is completed through the cyclic movement of the saw chain. However, the mini electric saw has low requirements for the maximum cyclic speed and the output power of the motor. When the cutting plate structure of the conventional electric saw saw chain is applied to the mini electric saw, there is a problem of large amplitude of cutting plate jitter, which is likely to cause a feeling of weak cutting force, resulting in easy jamming of the saw chain and poor cutting efficiency of the mini electric saw. Content of the Utility Model

[0003] In view of this, the utility model provides a mini electric saw saw chain and a mini electric saw to solve the problem of poor cutting efficiency in the prior art.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model proposes:

[0005] A mini electric saw saw chain, comprising:

[0006] A plurality of drive plates, which are arranged in a plane to form an annular structure;

[0007] A plurality of pins, which are penetrated and connected to the drive plates, and at least two pins are arranged on each drive plate;

[0008] A plurality of connecting plates, which are distributed on both sides of the annular structure and are used to connect the pins on adjacent two drive plates;

[0009] A plurality of cutting plates, which are alternately distributed on both sides of the annular structure; the cutting plate includes a first connecting portion, a depth limiting portion and a cutting portion. The first connecting portion is located on the side surface of the drive plate, and the first connecting portion is connected to the pins on adjacent two drive plates. The depth limiting portion is connected to the first connecting portion, and the cutting portion is connected to the first connecting portion, and the cutting portion is located behind the depth limiting portion;

[0010] Wherein, the cutting portion includes a horizontally extending section, a supporting section and a cutting section. The horizontally extending section includes a first end and a second end. The first end is connected to the first connecting portion, and the second end extends towards the direction where the drive plate is located; the supporting section is connected to the second end, and the supporting section is arranged close to the thickness center plane of the annular structure; a cutting edge is arranged on the front side of the cutting section, and the cutting section includes a third end and a fourth end. The third end is connected to the supporting section, and the fourth end extends towards the direction where the first connecting portion is located.

[0011] Preferably, the second end is disposed beyond the thickness center plane of the annular structure, and the support section is disposed parallel to the thickness center plane of the annular structure.

[0012] Preferably, for the two pin shafts connected by the first connecting portion, a first longitudinal axis is formed by the connecting line of the center points of the two pin shafts; the distance between the highest point of the cutting portion and the first longitudinal axis is the first height, and the distance between the highest point of the depth limiting portion and the first longitudinal axis is the second height, and the first height is longer than the second height.

[0013] Preferably, the first height is 0.5 mm to 1.2 mm longer than the second height.

[0014] Preferably, the first height is between 4.6 mm and 5.8 mm, and the second height is between 4.4 mm and 4.8 mm.

[0015] Preferably, the angle between the top surface of the cutting portion and the first longitudinal axis is between 0° and 8°, and the angle between the top surface of the depth limiting portion and the first longitudinal axis is between 0° and 8°.

[0016] Preferably, the transmission piece includes a second connecting portion, a guiding portion and a chip clearing portion. The pin shaft is arranged on the second connecting portion. The second connecting portion is used to connect with the connecting piece or the first connecting portion. The guiding portion is connected to the second connecting portion, and the chip clearing portion is connected to the second connecting portion, and the chip clearing portion is located behind the guiding portion, and the rear side of the chip clearing portion is arc-shaped.

[0017] Preferably, for the two pin shafts connected by the second connecting portion, a second longitudinal axis is formed by the connecting line of the center points of the two pin shafts; the distance between the lowest point of the guiding portion and the second longitudinal axis is the third height, and the distance between the lowest point of the chip clearing portion and the second longitudinal axis is the fourth height, and the fourth height is longer than the third height.

[0018] Preferably, the fourth height is 1.2 mm to 1.8 mm longer than the third height, the third height is between 3.2 mm and 3.8 mm, and the fourth height is between 5.0 mm and 5.6 mm.

[0019] The present invention also provides a mini electric saw, which includes the above-mentioned mini electric saw chain and guide plate. The annular structure is arranged in a closed loop. An annular guide groove is provided on the edge of the guide plate. The transmission piece extends into the annular guide groove. The distance between the fourth ends of two adjacent cutting pieces constitutes the maximum width of the mini electric saw chain, and the maximum width is less than or equal to the thickness of the guide plate.

[0020] Implementing the embodiments of the present invention will have the following beneficial effects:

[0021] After adopting the above-mentioned mini chainsaw chain, the support section is brought closer to the thickness center plane of the annular structure through the transverse extension section, improving the stability of the cutting disc, reducing the jumping generated during cutting of the cutting disc, thereby reducing the resistance it receives, and improving the cutting efficiency of the mini chainsaw chain. Similarly, for a mini chainsaw applying this mini chainsaw chain, it has good cutting efficiency for hard wood under the conditions of low power and low cycle speed. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Partial structural schematic diagram intercepted from a mini chainsaw chain in one embodiment Figure 1 .

[0024] Figure 2 Partial structural schematic diagram intercepted from a mini chainsaw chain in one embodiment Figure 2 ;

[0025] Figure 3 Partial structural schematic diagram intercepted from a mini chainsaw chain in one embodiment Figure 3 ;

[0026] Figure 4 Front view of a cutting disc in one embodiment;

[0027] Figure 5 Side view of a cutting disc in one embodiment;

[0028] Figure 6 Schematic three-dimensional structure diagram of a cutting disc in one embodiment, showing the extension direction of the transverse extension section and the extension direction of the cutting section;

[0029] Figure 7 Schematic structure diagram of a cutting disc connecting two drive plates in one embodiment, showing the thickness center plane of the annular structure.

[0030] Figure 8 Overall external shape schematic diagram of a mini chainsaw in one embodiment;

[0031] Figure 9 Schematic diagram of the structural relationship among a mini chainsaw chain, a guide plate, and a drive sprocket in one embodiment;

[0032] Figure 10In one embodiment, it is a cross-sectional view of the saw chain and guide plate of a mini circular saw;

[0033] Wherein:

[0034] Drive plate 1, annular structure 10, thickness center plane 100 of the annular structure, second connecting portion 11, guiding portion 12, chip clearing portion 13, second longitudinal axis 110, lowest point 121 of the guiding portion, rear side 131 of the chip clearing portion, lowest point 132 of the chip clearing portion;

[0035] Pin shaft 2;

[0036] Connecting plate 3;

[0037] Cutting blade 4, first connecting portion 41, depth limiting portion 42, cutting portion 43, first longitudinal axis 410, highest point 421 of the depth limiting portion, top surface 422 of the depth limiting portion, transverse extension section 431, support section 432, cutting section 433, highest point 434 of the cutting portion, top surface 435 of the cutting portion, first end 4311, second end 4312, cutting edge 4330, third end 4331, fourth end 4332;

[0038] Guide plate 5, annular guide groove 51;

[0039] Drive chain tooth 6;

[0040] Circular motion direction V, lower axis X, extension direction A of the second end, extension direction B of the fourth end, cross-sectional area C;

[0041] First height H1, second height H2, third height H3, fourth height H4;

[0042] Maximum width W1, thickness of the guide plate W2. Detailed implementation mode

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this utility model; the terms "including" and "having" and any variations thereof in the specification and claims of this utility model and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this utility model or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0044] References herein to "embodiments" mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0046] Referring to the attached Figures 1 to 10 , the present utility model provides a mini circular saw chain, which includes a plurality of drive plates 1, a plurality of pins 2, a plurality of connecting plates 3, and a plurality of cutting plates 4.

[0047] Among them, the plurality of drive plates 1 are arranged in a plane to form an annular structure 10, and the annular structure 10 can be closed-loop arranged to adapt to circular cyclic motion. The drive plates 1 are used for driving connection with the drive chain teeth 6 on the mini circular saw. The pins 2 are penetrated and connected to the drive plates 1, and at least two pins 2 are arranged on each drive plate 1. The plurality of connecting plates 3 are distributed on both sides of the annular structure 10 and are used for connecting the pins 2 on adjacent two drive plates 1. The plurality of cutting plates 4 are staggered and distributed on both sides of the annular structure 10 and are used for connecting the pins 2 on adjacent two drive plates 1. The drive plates 1 and the connecting plates 3, as well as the drive plates 1 and the cutting plates 4, are connected through the pins 2, that is, the pins 2 penetrate the drive plates 1 and the connecting plates 3, or the pins 2 penetrate the drive plates 1 and the cutting plates 4. Among them, the cutting plates 4 play the same connecting role as the connecting plates 3, and the cutting plates 4 also have a cutting function.

[0048] Specifically, the cutting plate 4 includes a first connecting portion 41, a depth limiting portion 42, and a cutting portion 43. The first connecting portion 41 is located on the side of the drive plate 1, and the first connecting portion 41 is connected to the pins 2 on adjacent two drive plates 1. The depth limiting portion 42 is connected to the first connecting portion 41, and the depth limiting portion 42 is used for limiting the cutting depth of the cutting plate 4. The cutting portion 43 is connected to the first connecting portion 41, and the cutting portion 43 is located behind the depth limiting portion 42. A cutting edge 4330 is provided on the cutting portion 43, and the object is cut by the cutting portion 43.

[0049] Among them, the cutting portion 43 includes a horizontally extending section 431, a supporting section 432, and a cutting section 433. The horizontally extending section 431 includes a first end 4311 and a second end 4312. The first end 4311 is connected to the first connecting portion 41, and the second end 4312 extends in the direction of the drive plate 1. This extending direction is as shown in the attached Figure 6As shown in direction A in the figure. The support section 432 is connected to the second end 4312, and the support section 432 extends upward and is arranged parallel to the thickness center plane 100 of the annular structure 10, and the support section 432 is arranged close to the thickness center plane 100 of the annular structure 10. The thickness center plane 100 of the annular structure 10 is as shown in the attached Figure 3 , 7 and as shown in FIGS. 10, the annular structure 10 is formed by arranging a plurality of driving pieces 1 in a plane. The thickness of the annular structure 10 is equal to the thickness of the driving piece 1, that is, the thickness center plane 100 is formed at half of the thickness of the driving piece 1. A cutting edge 4330 is provided on the front side of the cutting section 433. The cutting section 433 includes a third end 4331 and a fourth end 4332. The third end 4331 is connected to the support section 432, and the fourth end 4332 extends in the direction where the first connecting portion 41 is located. This extending direction is as shown in the attached Figure 6 direction B in the figure. The cutting edge 4330 extends from the third end 4331 to the fourth end 4332. In the cutting section 433, the cutting edge 4330 specifically plays a cutting role. In this embodiment, the vertical cross-section of the cutting portion 43 is arranged in a "C" shape with an opening facing outward. The support section 432 is brought close to the thickness center plane 100 of the annular structure 10 through the transverse extension section 431, so as to improve the stability of the cutting piece 4 and reduce the jumping generated when the cutting piece 4 performs cutting. Especially for cutting hard wood, the resistance received by it can be reduced, and the cutting efficiency of the saw chain of this mini-saw can be improved. The circulating movement direction V of the saw chain of this mini-saw is as shown in the attached Figure 1 figure. The positional relationship terms such as the front side and the rear are based on the usage state shown in this figure.

[0050] Referring to the attached Figures 8 to 10 , the present invention also provides a mini-saw, which includes the above-mentioned saw chain of the mini-saw, a guide plate 5, a driving sprocket 6 and a motor. The motor is used to drive the driving sprocket 6, and the driving sprocket 6 drives the saw chain of the mini-saw to circulate. The annular structure 10 is arranged in a closed loop. An annular guide groove 51 is provided on the edge of the guide plate 5, and the driving piece 1 extends into the annular guide groove 51.

[0051] In this embodiment, the power of the motor is below 650W, and the power of the motor determines the rotational speed of the driving sprocket. The circulating speed of the saw chain of the mini-saw is changed by adjusting the number of teeth and the pitch of the driving sprocket 6. The pitch of the driving sprocket is related to the pitch of the saw chain of the mini-saw.

[0052] The circulating speed of the mini-saw is calculated according to the following formula:

[0053]

[0054] wherein, V is the maximum circulating speed, P is the pitch, T is the number of teeth of the driving sprocket, and R is the rotational speed of the driving sprocket.

[0055] For example, when the pitch P is 0.25 in, the number of teeth T of the drive sprocket is 7, and the rotation speed R of the drive sprocket is 5000 r / min, the maximum cycle speed V can be calculated to be approximately 0.2916 in / s, which is converted to V≈7.408 m / s.

[0056] In this embodiment, V≤8m / s. Under this condition, the mini electric saw exhibits excellent cutting efficiency.

[0057] Furthermore, in order to enlarge the size of the blade 4330, in this embodiment, the second end 4312 is arranged beyond the thickness center plane 100 of the annular structure 10, and the fourth section of the cutting section 433 extends in the opposite direction, so that the extension length of the cutting section 433 is the same as the extension length of the transverse extension section 431. In addition, the projections of the two adjacent front and rear support sections 432 on the transverse cross section are partially overlapped.

[0058] Furthermore, the two pins 2 connected by the first connecting portion 41 form a first longitudinal axis 410 through a line connecting the center points of the two pins 2. The first longitudinal axis 410 is shown in the attached Figure 2 The distance between the highest point 434 of the cutting portion 43 and the first longitudinal axis 410 is a first height H1, and the distance between the highest point 421 of the depth limiting portion 42 and the first longitudinal axis 410 is a second height H2, and the first height H1 is longer than the second height H2.

[0059] Specifically, the first height H1 is 0.5 mm to 1.2 mm longer than the second height H2, that is, in a single cycle of the mini electric saw chain, the maximum cutting depth is between 0.5 mm and 1.2 mm, for example, the first height H1 is 1.0 mm longer than the second height H2. Under this height difference, the jumping amplitude generated by the cutting part is very small, which can ensure the cutting efficiency of the cutting blade.

[0060] In addition, the "L"-shaped cutting blade in the prior art has a large edge jump when cutting hard wood, and cannot start cutting wood directly. It needs to rely on its depth limiter to contact the hard wood for stability before it can cut smoothly, that is, its single cutting depth is its single maximum cutting depth, which will lead to the problem of large wood chips. In this embodiment, due to the high stability of the cutting part 43, when cutting hard wood, the cutting part 43 has a small jump, and can start cutting directly after contacting the hard wood, and the depth limiter 42 only serves to limit the single cutting depth, and the wood chips produced by cutting are smaller, which is more conducive to cleaning wood chips.

[0061] Further, on the basis that the first height H1 is longer than the second height H2, the first height H1 is between 4.6 mm and 5.8 mm, and the second height H2 is between 4.4 mm and 4.8 mm. In one embodiment, the first height H1 is 5.5 mm and the second height H2 is 4.5 mm.

[0062] Further, the angle a between the top surface 435 of the cutting part 43 and the first longitudinal axis 410 is between 0° and 8°, and the angle b between the top surface 422 of the depth limiting part 42 and the first longitudinal axis 410 is between 0° and 8°. The larger the values of the above two angles are set within the range, the smaller the resistance suffered by the saw chain of the mini electric saw during cutting. In addition, the top surface 435 of the cutting part 43 and the top surface 422 of the depth limiting part 42 can be arranged in an arc shape.

[0063] Further, the driving piece 1 also has a chip clearing function. Specifically, the driving piece 1 includes a second connecting part 11, a guiding part 12 and a chip clearing part 13. The pin shaft 2 is arranged through the second connecting part 11, and the second connecting part 11 is used to connect with the connecting piece 3 or the first connecting part 41. Specifically, at least two pin shafts 2 can be arranged through the second connecting part 11, one of the pin shafts 2 is connected with the connecting piece 3, and another pin shaft 2 is connected with the first connecting part 41. The guiding part 12 is connected to the lower side of the second connecting part 11, and the chip clearing part 13 is connected to the second connecting part 11, and the chip clearing part 13 is located behind the guiding part 12, and the rear side 131 of the chip clearing part 13 is arranged in an arc shape. After the saw chain of the mini electric saw is installed on the guide plate 5, the chip clearing part 13 is used to scrape the wood chips in the annular guide groove 51.

[0064] Specifically, for the two pin shafts 2 connected by the second connecting part 11, the connecting line of the center points of the two pin shafts 2 forms a second longitudinal axis 110, and the second longitudinal axis 110 is as shown in the attached Figure 2 figure. In the attached Figure 2 figure, the second longitudinal axis 110 coincides with the first longitudinal axis 410. The distance between the lowest point 121 of the guiding part 12 and the second longitudinal axis 110 is the third height H3, and the distance between the lowest point 132 of the chip clearing part 13 and the second longitudinal axis 110 is the fourth height H4, and the fourth height H4 is longer than the third height H3. Specifically, the fourth height H4 is 1.2 mm to 1.8 mm longer than the third height H3, for example, 1.5 mm longer. On this basis, the third height H3 is between 3.2 mm and 3.8 mm, and the fourth height H4 is between 5.0 mm and 5.6 mm. In one embodiment, the third height H3 is 3.7 mm and the fourth height H4 is 5.2 mm.

[0065] Further, referring to the attached Figure 2, on the drive plate 1, a lower axis X is formed with the bottom of the connecting plate 3 as a reference. The cross-sectional area of the part of the drive plate 1 below the lower axis X is C, and the cross-sectional area C is made less than or equal to 11.2 square millimeters. This improves the frictional resistance suffered by the improved saw chain during cyclic movement in the annular guide groove 51, reduces the heat generation phenomenon, that is, reduces the kinetic energy loss, and indirectly improves the cutting performance of the saw chain and the mini electric saw of this mini electric saw.

[0066] In addition, referring to the attached Figure 10 , the maximum width W1 of the saw chain of this mini electric saw is determined by the spacing between the fourth ends 4332 of two adjacent cutting pieces 4. The maximum width W1 of the saw chain also determines the width of the cut when the saw chain cuts. The maximum width W1 of the saw chain of this mini electric saw is less than or equal to the thickness W2 of the guide plate 5, making the maximum width W1 close to the thickness W2 of the guide plate 5 to reduce the resistance suffered by the saw chain of the mini electric saw, and at the same time maintain a sufficient length of the cutting edge 4330. Further, the fourth end 4332 extends to be flush with the outer surface of the first connecting portion 41.

[0067] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure made by using the specification and drawings of the present invention and directly or indirectly applied in other related technical fields shall be equally within the scope of the patent protection of the present invention.

Claims

1. A mini circular saw chain, characterized in that, Including: A plurality of transmission plates, and the plurality of transmission plates are arranged on a plane to form an annular structure; A plurality of pin shafts, and the pin shafts are penetrated and connected to the transmission plates, and at least two pin shafts are arranged on each of the transmission plates; A plurality of connecting plates, and the plurality of connecting plates are distributed on both sides of the annular structure and are used to connect the pin shafts on two adjacent transmission plates; A plurality of cutting plates, and the plurality of cutting plates are staggered and distributed on both sides of the annular structure; the cutting plate includes a first connecting portion, a depth limiting portion and a cutting portion, the first connecting portion is located on the side surface of the transmission plate, the first connecting portion is connected to the pin shafts on two adjacent transmission plates, the depth limiting portion is connected to the first connecting portion, the cutting portion is connected to the first connecting portion, and the cutting portion is located behind the depth limiting portion; Wherein, the cutting portion includes a transverse extension section, a support section and a cutting section, the transverse extension section includes a first end and a second end, the first end is connected to the first connecting portion, and the second end extends towards the direction where the transmission plate is located; the support section is connected to the second end, and the support section is arranged close to the thickness center plane of the annular structure; a cutting edge is arranged on the front side of the cutting section, the cutting section includes a third end and a fourth end, the third end is connected to the support section, and the fourth end extends towards the direction where the first connecting portion is located.

2. A mini circular saw chain according to claim 1, characterized in that, The second end is arranged beyond the thickness center plane of the annular structure, and the support section is arranged parallel to the thickness center plane of the annular structure.

3. A mini circular saw chain according to claim 1, characterized in that, For the two pin shafts connected by the first connecting portion, a first longitudinal axis is formed by connecting the center points of the two pin shafts; The distance between the highest point of the cutting portion and the first longitudinal axis is a first height, the distance between the highest point of the depth limiting portion and the first longitudinal axis is a second height, and the first height is longer than the second height.

4. A mini circular saw chain according to claim 3, characterized in that, The first height is 0.5 mm to 1.2 mm longer than the second height.

5. A mini circular saw chain according to claim 4, characterized in that, The first height is between 4.6 mm and 5.8 mm, and the second height is between 4.4 mm and 4.8 mm.

6. A mini circular saw chain according to claim 3, characterized in that, The included angle between the top surface of the cutting portion and the first longitudinal axis is between 0° and 8°, and the included angle between the top surface of the depth limiting portion and the first longitudinal axis is between 0° and 8°.

7. A mini circular saw chain according to claim 1, characterized in that, The transmission plate includes a second connecting portion, a guiding portion and a chip clearing portion, the pin shaft is arranged on the second connecting portion, the second connecting portion is used to connect with the connecting plate or the first connecting portion, the guiding portion is connected to the second connecting portion, the chip clearing portion is connected to the second connecting portion, and the chip clearing portion is located behind the guiding portion, and the rear side of the chip clearing portion is arc-shaped.

8. A mini circular saw chain according to claim 7, characterized in that, For the two pin shafts connected by the second connecting portion, a second longitudinal axis is formed by connecting the center points of the two pin shafts; The distance between the lowest point of the guiding portion and the second longitudinal axis is a third height, the distance between the lowest point of the chip clearing portion and the second longitudinal axis is a fourth height, and the fourth height is longer than the third height.

9. A mini circular saw chain according to claim 8, wherein, The fourth height is 1.2 millimeters to 1.8 millimeters longer than the third height, the third height is between 3.2 millimeters and 3.8 millimeters, and the fourth height is between 5.0 millimeters and 5.6 millimeters.

10. A mini circular saw, characterized in that, Comprising the mini circular saw chain and the guide plate according to any one of claims 1-9, the annular structure is arranged in a closed loop, an annular guide groove is provided on the edge of the guide plate, the transmission piece extends into the annular guide groove, and the distance between the fourth ends of two adjacent cutting pieces constitutes the maximum width of the mini circular saw chain, and the maximum width is less than the thickness of the guide plate.

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