Differential guide wheel positioning assembly and cutting machine

Abstract

The utility model discloses a differential guide wheel positioning assembly and a cutting machine, the differential guide wheel positioning assembly is used for clamping and positioning a circular saw blade and comprises two guide wheels oppositely arranged on two sides of the circular saw blade and two bases respectively used for installing the two guide wheels, and the bases are provided with installing shafts used for installing the guide wheels; wherein at least one guide wheel comprises a first wheel body and a second wheel body, the first wheel body and the mounting shaft are coaxially arranged, the first wheel body is rotatably mounted on the mounting shaft, the second wheel body is located on the side, away from the circle center direction of the circular saw blade, of the first wheel body, the circular saw blade is clamped and positioned between the two guide wheels, and the side face of the circular saw blade abuts against the first wheel body and the second wheel body. When the circular saw blade rotates, friction drives the two guide wheels to rotate, and the angular speed of rotation of the second wheel body is larger than that of rotation of the first wheel body. According to the differential guide wheel positioning assembly, the sliding friction force loss between the guide wheel and the circular saw blade can be reduced, the additional energy consumption is reduced, the power is reduced, and the service life of the guide wheel and the circular saw blade is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of cutting devices, in particular to a differential guide wheel positioning assembly and a cutting machine. Background Art

[0002] The cutting machines currently on the market are used for cutting walls, floors, doors and windows, tiles, steel bars, concrete and other structures. For example, a utility model patent with the announcement number CN220903778U is named a water-cooled ring saw with a limiting stabilization mechanism. It mainly includes a saw blade guard, a ring saw blade installed and positioned in the saw blade guard at one end through an adjustment mechanism, and a driving mechanism for driving the ring saw blade to rotate. Among them, its adjustment mechanism includes four positioning guide wheels symmetrically arranged on both sides of the ring saw blade. The four positioning guide wheels are respectively arranged parallel to the ring saw blade and are set to a cylindrical structure with an integrated structure. The ring saw blade is clamped between the four positioning guide wheels. When the ring saw blade rotates, it drives the positioning guide wheels to rotate by friction with each positioning guide wheel.

[0003] In the above technical solution, since the circumferences of the inner and outer rings of the annular saw blade are different, that is, the angular velocities of the inner and outer rings of the annular saw blade are the same but the linear velocities are different, when the positioning guide wheel rotates with the annular saw blade, the friction between the side close to the center of the annular saw blade and the inner ring of the annular saw blade and the rolling friction between the side away from the center of the annular saw blade and the outer ring of the annular saw blade produce a speed difference, and the positioning guide wheel is set as an integrated structure, thereby generating sliding friction between the positioning guide wheel and the annular saw blade, resulting in large friction loss, large additional energy consumption, high power, large wear on the positioning guide wheel and the annular saw blade, and short service life. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the utility model provides a differential guide wheel positioning assembly and a cutting machine, the differential guide wheel positioning assembly being used for clamping and positioning a circular saw blade, comprising two guide wheels relatively arranged on both sides of the circular saw blade, and two bases respectively used to mount the two guide wheels, the bases having mounting shafts for mounting the guide wheels; at least one of the guide wheels comprising a first wheel body respectively coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft, and a second wheel body located on a side of the first wheel body away from the center direction of the circular saw blade, the circular saw blade being clamped and positioned between the two guide wheels and with its side surfaces abutting against the first wheel body and the second wheel body, and when the circular saw blade rotates, friction drives the two guide wheels to rotate, and the angular velocity of the second wheel body is greater than the angular velocity of the first wheel body.

[0005] Preferably, at least one fourth wheel body is arranged between the first wheel body and the second wheel body. The fourth wheel body is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameter of the fourth wheel body is larger than the outer diameters of the first wheel body and the second wheel body, and is used to extend into the circular guide rail groove correspondingly arranged on the side surface of the circular saw blade for limiting and guiding.

[0006] Preferably, there are at least two fourth wheel bodies, and a third wheel body is provided between two adjacent fourth wheel bodies, which is coaxially arranged with the mounting axis and rotatably mounted on the mounting axis. The outer diameters of the first wheel body, the second wheel body, and the third wheel body are the same. When the circular saw blade rotates, the angular velocity of the third wheel body is greater than the angular velocity of the first wheel body and less than the angular velocity of the second wheel body.

[0007] Preferably, at least one sixth wheel body is arranged between the first wheel body and the second wheel body. The sixth wheel body is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameter of the sixth wheel body is smaller than the outer diameters of the first wheel body and the second wheel body, and the outer side wall of the sixth wheel body does not contact the circular saw blade.

[0008] Preferably, there are at least two sixth wheel bodies, and a fifth wheel body is provided between two adjacent sixth wheel bodies, which is coaxially arranged with the mounting axis and rotatably mounted on the mounting axis. The outer diameters of the first wheel body, the second wheel body, and the fifth wheel body are the same. When the circular saw blade rotates, the angular velocity of the fifth wheel body is greater than the angular velocity of the first wheel body and less than the angular velocity of the second wheel body.

[0009] Preferably, the two adjacently arranged wheel bodies are connected for relative rotation via a plane bearing.

[0010] Preferably, the plane bearing includes an annular bearing frame arranged between two adjacent wheel bodies and a rolling element installed on the annular bearing frame, the annular bearing frame includes an inner ring bearing plate, an outer ring bearing plate, and a plurality of connecting plates connected between the inner ring bearing plate and the outer ring bearing plate, and the rolling element is arranged along the circumferential direction of the mounting shaft and is rotatably installed in a rolling area formed by the two adjacent connecting plates and the inner ring bearing plate and the outer ring bearing plate. When the circular saw blade rotates, the rolling element rotates radially around the mounting shaft under the friction of the two adjacent wheel bodies.

[0011] Preferably, each wheel body is rotatably connected to the mounting shaft via a bearing member.

[0012] The present utility model also provides a cutting machine, comprising a cutting body, at least two groups of the above-mentioned differential guide wheel positioning assemblies installed on the cutting body, a circular saw blade clamped and positioned between each group of relatively arranged guide wheels, and a driving structure installed on the cutting body, wherein the driving structure is transmission-connected to the circular saw blade and is used to drive the circular saw blade to rotate.

[0013] Preferably, at least one of the bases is movably connected to the cutting body via an adjusting structure, and the adjusting structure can drive the base and another base arranged opposite to it to move closer to or away from each other by moving relative to the cutting body, so as to adjust the preload force between the guide wheel and the circular saw blade.

[0014] The cam is configured to move the first and second wheels relative to each other so that the cam can move relative to the first wheel and the second wheel relative to each other, thereby reducing the risk of sliding friction between the guide wheel and the circular saw blade.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 The structure diagram of the differential guide wheel positioning assembly and the circular saw blade of an embodiment of the present invention is shown in FIG. Figure 1 .

[0018] Figure 2 The structure diagram of the differential guide wheel positioning assembly and the circular saw blade of an embodiment of the present invention is shown in FIG. Figure 2 .

[0019] Figure 3 This is a schematic cross-sectional view of a differential guide wheel positioning assembly and a circular saw blade according to an embodiment of the present invention.

[0020] Figure 4 This is a structural schematic diagram of a differential guide wheel positioning assembly according to an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the exploded structure of the differential guide wheel positioning assembly according to one embodiment of the present invention.

[0022] Figure 6 This is a schematic structural diagram of a cutting machine according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the exploded structure of a cutting machine according to an embodiment of the present invention.

[0024] Figure 8 This is a structural diagram of a cutting machine according to another embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar expressions used in the specification and claims of this utility model patent application do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation on quantity, but rather indicate the presence of at least one.

[0030] like Figure 1-5As shown, as an embodiment of the present invention, a differential guide wheel positioning assembly 2 is provided for clamping and positioning a circular saw blade 1. The differential guide wheel positioning assembly 2 includes two guide wheels 21 arranged on opposite sides of the circular saw blade 1, and two bases 22 for mounting the two guide wheels 21, each having a mounting shaft 221 for mounting the guide wheels 21. The guide wheels 21 include a first wheel body 211 coaxially arranged with the mounting shaft 221 and rotatably mounted on the mounting shaft 221, and a second wheel body 212 located on a side of the first wheel body 211 away from the center of the circular saw blade 1. The circular saw blade 1 is clamped and positioned between the two guide wheels 21, with its two side surfaces respectively contacting the first wheel body 211 and the second wheel body 212 of the two guide wheels 21. When the circular saw blade 1 rotates, friction drives the two guide wheels 21 to rotate, and the angular velocity of the second wheel body 212 is greater than the angular velocity of the first wheel body 211. In this embodiment, since the guide wheel 21 includes a first wheel body 211 and a second wheel body 212 which are respectively arranged coaxially with the mounting shaft 221 and rotatably mounted on the mounting shaft 221, that is, the first wheel body 211 and the second wheel body 212 are respectively configured as independent structures, so that the first wheel body 211 on the side close to the center direction of the circular saw blade 1 and the second wheel body 212 on the side away from the center direction of the circular saw blade 1 can be independently driven by the friction between the inner and outer rings of the circular saw blade 1, and the rotational movement of the second wheel body 212 does not interfere with the rotational movement of the first wheel body 211. , and the angular velocity of the rotation of the second wheel body 212 is greater than the angular velocity of the rotation of the first wheel body 211. Compared with the prior art in which the first wheel body and the second wheel body are set as an integrated structure, during the rotation of the circular saw blade 1, the rolling friction between the second wheel body 212 and the outer ring of the circular saw blade 1 and the rolling friction between the first wheel body 211 and the inner ring of the circular saw blade 1 do not interfere with each other, thereby reducing the sliding friction loss between the guide wheel 21 and the circular saw blade 1, reducing additional energy consumption, reducing power, and extending the service life of the guide wheel 21 and the circular saw blade 1. In this embodiment, the guide wheels 21 on both sides are configured to include a first wheel body 211 that is coaxially arranged with the mounting shaft 221 and rotatable and is installed on the mounting shaft 221, and a second wheel body 212 that is located on the side of the first wheel body 211 away from the center of the circular saw blade 1, which can simultaneously reduce the sliding friction loss between the guide wheels 21 on both sides and the two side surfaces of the circular saw blade 1. In other embodiments, only one of the guide wheels 21 can be configured to include a first wheel body 211 that is coaxially arranged with the mounting shaft 221 and rotatable and is installed on the mounting shaft 221, and a second wheel body 212 that is located on the side of the first wheel body 211 away from the center of the circular saw blade 1, which is used to reduce the sliding friction loss between the guide wheel 21 on one side and one side of the circular saw blade 1.

[0031] like Figure 3As shown, in some specific embodiments, in the guide wheel 21 arranged on one side of the circular saw blade 1, two fourth wheel bodies 214 are further arranged between the first wheel body 211 and the second wheel body 212. Each fourth wheel body 214 is coaxially arranged with the mounting shaft 221 and rotatably mounted on the mounting shaft 221. The outer diameter of the fourth wheel body 214 is larger than the outer diameter of the first wheel body 211 and the second wheel body 213. It is used to extend into the circular guide rail groove 11 correspondingly arranged on the side surface of the circular saw blade 1 for limiting and guiding, so as to prevent the circular saw blade 1 from falling off from the differential guide wheel positioning assembly 2 during rotation, thereby improving safety during use. A third wheel body 213 is provided between the two fourth wheel bodies 214, which is coaxially arranged with the mounting shaft 221 and rotatably mounted on the mounting shaft 221. The outer diameters of the first wheel body 211, the second wheel body 212, and the third wheel body 213 are the same. The circular saw blade 1 is clamped and positioned between the two guide wheels 21, and one side thereof is in contact with the first wheel body 211, the second wheel body 212, and the third wheel body 213 of the guide wheel 21, respectively. When the circular saw blade 1 rotates, friction drives the two guide wheels 21 to rotate. The angular velocity of the third wheel body 213 is greater than the angular velocity of the first wheel body 211, and less than the angular velocity of the second wheel body 212. In other embodiments, only one fourth wheel body 214 may be arranged between the first wheel body 211 and the second wheel body 212, in which case the third wheel body 213 is not required, or a larger number of fourth wheel bodies 214 may be arranged between the first wheel body 211 and the second wheel body 212, in which case the third wheel body 213 may be arranged between two adjacent fourth wheel bodies 214.

[0032] In some specific embodiments, in the guide wheel 21 arranged on the other side of the circular saw blade 1, two sixth wheel bodies 216 are arranged between the first wheel body 211 and the second wheel body 212. Each sixth wheel body 216 is coaxially arranged with the mounting shaft 221 and rotatably mounted on the mounting shaft 221. The outer diameter of the sixth wheel body 216 is smaller than the outer diameter of the first wheel body 211 and the second wheel body 212, and the outer side wall of the sixth wheel body 216 does not contact the circular saw blade 1. A fifth wheel body 215 is provided between the two sixth wheel bodies 216, which is coaxially arranged with the mounting shaft 221 and rotatably mounted on the mounting shaft 221. The outer diameters of the first wheel body 211, the second wheel body 212, and the fifth wheel body 215 are the same. The circular saw blade 1 is clamped and positioned between the two guide wheels 21, and the other side surface is respectively in contact with the first wheel body 211, the second wheel body 212, and the fifth wheel body 215 of the guide wheel 21. When the circular saw blade 1 rotates, the friction drives the two guide wheels 21 to rotate. The angular velocity of the fifth wheel body 215 is greater than the angular velocity of the first wheel body 211 and less than the angular velocity of the second wheel body 212. In other embodiments, only one sixth wheel body 216 may be arranged between the first wheel body 211 and the second wheel body 212, in which case there is no need to set the fifth wheel body 215, or a larger number of sixth wheel bodies 216 may be arranged between the first wheel body 211 and the second wheel body 212, in which case the fifth wheel body 215 may be arranged between two adjacent sixth wheel bodies 216.

[0033] like Figure 3 As shown, in some embodiments, two adjacent wheels are connected for relative rotation via planar bearings 217, reducing friction between the two wheels and ensuring that the two adjacent wheels do not interfere with each other during rotation. The inner side of each wheel is rotatably connected to the mounting shaft 221 via a bearing 218, facilitating smoother rotation of each wheel relative to the mounting shaft 221.

[0034] like Figure 5As shown, in some specific embodiments, the plane bearing 217 includes a circular bearing frame 2171 arranged between two adjacent wheel bodies and a rolling element 2172 installed on the circular bearing frame 2171. The circular bearing frame 2171 includes an inner ring bearing plate, an outer ring bearing plate, and a plurality of connecting plates connected between the inner ring bearing plate and the outer ring bearing plate. The rolling elements 2172 are arranged in a plurality of ways along the circumferential direction of the mounting shaft 221 and are rotatably installed in a rolling area formed by the adjacent connecting plates and the inner ring bearing plate and the outer ring bearing plate. When the circular saw blade 1 rotates, the rolling element 2172 rotates radially around the mounting shaft 221 under the friction of the two adjacent wheel bodies. In this embodiment, the rolling element 2172 is configured as a cylindrical structure arranged radially along the mounting shaft 221, and makes line-surface contact with the wheel body. The contact surface is large and the wheel body is not easily damaged. In other embodiments, the rolling element 2172 can also be configured as a ball structure, which makes point-surface contact with the wheel body, and can also reduce the friction between the two adjacent wheel bodies, ensuring that the two adjacent wheel bodies do not interfere with each other during rotation.

[0035] like Figure 3 As shown, in some specific embodiments, a fastening structure is provided on the end of the mounting shaft 221 that is close to the circular direction of the circular saw blade 1, which is used to prevent the wheel body from being disconnected from the mounting shaft 221. The fastening structure includes a fastening plate 222 arranged opposite the first wheel body 211 and a fastener 223 arranged on the side of the fastening plate 222 away from the first wheel body 211. The fastening plate 222 is sleeved on the mounting shaft 221 and is connected to the first wheel body 211 for relative rotation via a plane bearing. The fastener 223 is threadedly engaged with the mounting shaft 221 to fasten the fastening plate 222 and each wheel body to the mounting shaft 221.

[0036] like Figure 1 As shown, in some specific embodiments, the differential guide wheel positioning assembly 2 is arranged in two groups at intervals along the circumferential direction of the circular saw blade 1, and the circular saw blade 1 is configured as a circular ring structure. The hollow structure of the circular saw blade 1 is conducive to heat dissipation. In other embodiments, the differential guide wheel positioning assembly 2 can also be arranged in only one group or more groups, and the circular saw blade 1 can also be configured as a solid circle structure, both of which can be used for cutting walls, floors, doors and windows, tiles, steel bars, concrete and other structures.

[0037] like Figure 3 As shown, in some specific embodiments, the mounting shaft 221 is arranged parallel to the plane where the circular saw blade 1 is located, so that the guide wheel 21 is arranged parallel to the circular saw blade 1, which is suitable for the cutting body of some common cutting machines currently on the market. In other embodiments, the mounting shaft 221 is arranged at an angle to the plane where the circular saw blade 1 is located, so that the guide wheel 21 is arranged at an angle to the circular saw blade 1, which can both be used for positioning the circular saw blade 1 during rotation.

[0038] like Figure 6-7As shown, as another embodiment of the present invention, a cutting machine is also provided, comprising a cutting body 3, two groups of the above-mentioned differential guide wheel positioning assemblies 2 mounted on the cutting body 3, a circular saw blade 1 clamped and positioned between each group of relatively arranged guide wheels 21, and a driving structure (not shown in the figure) mounted on the cutting body 3, the driving structure being transmission-connected to the circular saw blade 1 for driving the circular saw blade 1 to rotate. The cutting machine in this embodiment, since it adopts the differential guide wheel positioning assembly 2 provided by the present invention, can also reduce the loss of sliding friction between the guide wheel 21 and the circular saw blade 1, reduce additional energy consumption, reduce power, and thus extend the service life of the cutting machine. In other embodiments, more groups of the differential guide wheel positioning assembly 2 can also be provided to improve the stability of the positioning of the circular saw blade 1.

[0039] like Figure 7 As shown, in some specific embodiments, the base 22 corresponding to the guide wheel 21 arranged on the side of the circular saw blade 1 away from the circular guide groove 11 is movably connected to the cutting body 3 through an adjustment structure (not shown in the figure). The adjustment structure can drive the base 22 and another base 22 arranged opposite to it to move closer to or away from each other by moving relative to the cutting body 3, so as to adjust the preload force between the guide wheel 21 and the circular saw blade 1. Optionally, an adjustment member 224 and an adjustment member 225 are respectively protruded on both sides of the base 22, and a connecting channel 2241 arranged parallel to the axial direction of the installation shaft 221 is provided on the adjustment member 224, and an adjustment channel 2251 arranged parallel to the radial direction of the installation shaft 221 is provided on the adjustment member 225. A matching channel 31 arranged corresponding to the adjustment channel 2251 is provided on the cutting body 3. The adjustment structure includes a connecting piece that is sleeved in the connecting channel 2241 and positioned on the cutting body 3, and a fastener that is connected to the adjusting channel 2251 and the matching channel 31. The fastener can be set to be fixedly connected to one of the adjusting channel 2251 and the matching channel 31, and threadedly connected to the other of the adjusting channel 2251 and the matching channel 31. The operator can rotate the fastener to move along the adjusting channel 2251, thereby driving the base 22 and the guide wheel 21 to rotate as a whole around the connecting piece to approach another base 22 arranged opposite to the base 22, or rotate to away from another base 22 arranged opposite to the base 22, thereby adjusting the preload force between the guide wheel 21 and the circular saw blade 1.

[0040] like Figure 6As shown, in some specific embodiments, the circular saw blade 1 has a saw tooth component 12 for cutting arranged along its outer periphery, and a gear ring component 13 for transmission arranged along its inner periphery. The driving structure includes a driving wheel 4 for driving the circular saw blade 1 to rotate. The driving wheel 4 is made of metal materials such as steel and iron. The driving wheel 4 includes a wheel body 41 and a plurality of driving teeth 42 arranged along the circumferential direction of the wheel body 41. The transmission is performed by meshing the rigid gear ring component 13 with the rigid driving teeth 42, so that the driving wheel 4 is not easy to slip relative to the circular saw blade 1, and the transmission process is more stable and reliable.

[0041] like Figure 8 As shown, as another embodiment of the present invention, a cutting machine is also provided. The main difference between this embodiment and the previous embodiment is that the inner circumferential side of the circular saw blade 1 is set as a smooth circumferential surface 14, and the driving wheel 4 is made of rubber, plastic and other materials with certain deformation ability. The driving wheel 4 includes a wheel body 41 and a friction circumferential surface 43 arranged along the circumferential direction of the wheel body 41. The transmission is performed through the interference fit and mutual friction between the friction circumferential surface 43 and the smooth circumferential surface 14, and can also drive the circular saw blade 1 to rotate.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

[0043] In short, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention patent.

Claims

1. A differential guide wheel positioning assembly for clamping and positioning a circular saw blade, characterized by: It comprises two guide wheels arranged opposite to each other on both sides of a circular saw blade, and two bases for mounting the two guide wheels respectively, wherein the bases have mounting shafts for mounting the guide wheels; At least one of the guide wheels includes a first wheel body that is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft, and a second wheel body that is located on the side of the first wheel body away from the center of the circular saw blade. The circular saw blade is clamped and positioned between the two guide wheels, and the side surfaces abut against the first wheel body and the second wheel body. When the circular saw blade rotates, friction drives the two guide wheels to rotate, and the angular velocity of the second wheel body is greater than the angular velocity of the first wheel body.

2. The differential guide wheel positioning assembly according to claim 1, characterized in that: At least one fourth wheel body is arranged between the first wheel body and the second wheel body. The fourth wheel body is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameter of the fourth wheel body is larger than the outer diameters of the first wheel body and the second wheel body, and is used to extend into the circular guide rail groove correspondingly arranged on the side surface of the circular saw blade for limiting and guiding.

3. The differential guide wheel positioning assembly according to claim 2, characterized in that: There are at least two fourth wheel bodies, and a third wheel body is provided between two adjacent fourth wheel bodies, which is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameters of the first wheel body, the second wheel body, and the third wheel body are the same. When the circular saw blade rotates, the angular velocity of the third wheel body is greater than the angular velocity of the first wheel body and less than the angular velocity of the second wheel body.

4. The differential guide wheel positioning assembly according to claim 1, characterized in that: At least one sixth wheel body is arranged between the first wheel body and the second wheel body. The sixth wheel body is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameter of the sixth wheel body is smaller than the outer diameters of the first wheel body and the second wheel body, and the outer side wall of the sixth wheel body does not contact the circular saw blade.

5. The differential guide wheel positioning assembly according to claim 4, characterized in that: There are at least two sixth wheel bodies, and a fifth wheel body is provided between two adjacent sixth wheel bodies, which is coaxially arranged with the mounting shaft and rotatably mounted on the mounting shaft. The outer diameters of the first wheel body, the second wheel body, and the fifth wheel body are the same. When the circular saw blade rotates, the angular velocity of the fifth wheel body is greater than the angular velocity of the first wheel body and less than the angular velocity of the second wheel body.

6. The differential guide wheel positioning assembly according to any one of claims 1 to 5, characterized in that: The two adjacent wheel bodies are connected for relative rotation via a plane bearing.

7. The differential guide wheel positioning assembly according to claim 6, characterized in that: The plane bearing includes an annular bearing frame arranged between two adjacent wheel bodies and a rolling element installed on the annular bearing frame. The annular bearing frame includes an inner ring bearing plate, an outer ring bearing plate, and several connecting plates connected between the inner ring bearing plate and the outer ring bearing plate. The rolling element is arranged along the circumferential direction of the mounting shaft and is rotatably installed in a rolling area formed by the two adjacent connecting plates and the inner ring bearing plate and the outer ring bearing plate. When the circular saw blade rotates, the rolling element rotates radially around the mounting shaft under the friction of the two adjacent wheel bodies.

8. The differential guide wheel positioning assembly according to any one of claims 1 to 5, characterized in that: Each wheel body is rotatably connected to the mounting shaft via a bearing member.

9. A cutting machine, characterized in that: It includes a cutting body, at least two groups of differential guide wheel positioning assemblies as described in any one of claims 1 to 8 installed on the cutting body, a circular saw blade clamped and positioned between each group of relatively arranged guide wheels, and a driving structure installed on the cutting body, wherein the driving structure is connected to the circular saw blade for driving the circular saw blade to rotate.

10. The cutting machine according to claim 9, characterized in that: At least one of the bases is movably connected to the cutting body via an adjusting structure, and the adjusting structure can drive the base and another base arranged opposite to it to move closer to or away from each other by moving relative to the cutting body, so as to adjust the preload force between the guide wheel and the circular saw blade.

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