Ring saw

Abstract

The trephine comprises a machine body, a machine head, a protective cover and a cutting assembly, the machine head is connected to the front end of the machine body, the protective cover is connected to the machine head, the cutting assembly is connected to the protective cover, and the cutting assembly comprises a driving wheel, a saw blade base body, a guide plate and two guide wheels. The driving wheel, the guide plate and the guide wheel are arranged on the inner circumferential side of the saw blade base body. According to the trephine, a matched connection structure of the saw blade, the guide plates, the guide wheels and the driving wheel is adopted, the driving wheel and the two guide wheels are jointly connected with the inner circumferential side of the saw blade in a matched mode to form a triangular structure, and therefore the saw blade is stably supported and positioned, and the operation stability is high; the position of the guide wheel guide plate can be reasonably arranged, it is ensured that the guide wheel and the driving wheel can be effectively matched with the saw blade, adaptive adjustment can be conducted even if abrasion occurs, and the service life of the saw blade is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of electric tools and relates to a ring saw. Background Art

[0002] In operations such as cutting stone and grooving concrete, a ring saw is a commonly used deep cutting tool. It uses a ring-shaped saw blade, which is positioned by a positioning device and supported by a positioning support, and uses an active wheel to drive the saw blade to rotate to achieve cutting.

[0003] The positioning devices of existing ring saw products mostly adopt the form of a guide plate. The guide plate is set on the inner side of the saw blade, and cooperates with the guide wheel and the driving wheel to provide radial and axial support and positioning for the saw blade to ensure the stability of the saw blade. However, in the high-speed and high-vibration operation scenario of the ring saw, the matching connection part between the saw blade and the guide wheel and guide plate is prone to wear, which affects the stability of the connection and the stability of the saw blade movement. The stability of existing products loses stability too quickly when wear occurs, resulting in frequent maintenance or replacement of saw blades or guide wheels, and excessive consumption of operating consumables. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a ring saw.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A ring saw comprises a body, a head, a protective cover and a cutting assembly, wherein the head is connected to the front end of the body, the protective cover is connected to the head, and the cutting assembly is connected to the protective cover. The cutting assembly comprises a driving wheel, a saw blade base, a guide plate and two guide wheels, wherein the driving wheel, the guide plate and the guide wheel are arranged on the inner circumference of the saw blade base, the guide wheel is connected to the guide plate, and the guide plate is connected to the protective cover. A power assembly for driving the driving wheel to rotate is arranged in the head, and the outer peripheries of the driving wheel and the guide wheel are both abutted against the inner periphery of the saw blade base.

[0006] Furthermore, two inclined surfaces are oppositely arranged on both sides of the saw blade base, a flange is protruding from the inner periphery of the saw blade base, a contact peripheral surface is arranged between the side wall of the flange and the inclined surface, both sides of the contact peripheral surface respectively form set angles with the side wall of the flange and the inclined surface, and the outer peripheral wall of the guide wheel contacts the contact peripheral surface.

[0007] Furthermore, the guide wheel includes an outer fixed wheel, an inner moving wheel and a wheel plate, a side plate is arranged on the guide plate, the outer fixed wheel is fixedly connected to the side plate, the inner moving wheel is passed through the inner circumference of the outer fixed wheel, a plurality of rollers are arranged between the outer circumference of the inner moving wheel and the inner circumference of the outer fixed wheel, the two wheel plates are respectively fixedly connected to the axial ends of the inner moving wheel, and the outer circumferential walls of the two wheel plates are respectively abutted against the two abutting circumferential surfaces.

[0008] Furthermore, two inclined surfaces are oppositely arranged on both sides of the saw blade base, and a flange is protruded from the inner periphery of the saw blade base. The two side walls of the flange are respectively connected with the two inclined surfaces to form a set angle, and the outer peripheral wall of the guide wheel is against the inner peripheral wall of the flange.

[0009] Furthermore, the guide wheel includes an inner fixed wheel and an outer moving wheel, a side plate is arranged on the guide plate, a flat groove for accommodating the inner fixed wheel and the outer moving wheel is arranged in the side plate, the inner fixed wheel is fixedly connected in the flat groove, the outer moving wheel ring is arranged on the outer periphery of the inner fixed wheel, a plurality of rollers are arranged along the circumferential direction between the inner periphery of the outer moving wheel and the outer periphery of the inner fixed wheel, and the outer peripheral wall of the outer moving wheel is abutted against the inner peripheral wall of the flange.

[0010] Furthermore, two inclined surfaces are oppositely arranged on both sides of the saw blade base, the outer periphery of the driving wheel is provided with a first V-shaped groove for abutting against the two inclined surfaces, and the outer periphery of the guide wheel is provided with a second V-shaped groove for abutting against the two inclined surfaces.

[0011] Furthermore, the angle formed by the inclined surface and the radial plane of the saw blade base is 5° to 45°.

[0012] Furthermore, the outer periphery of the driving wheel is provided with a first V-shaped groove for abutting against the two inclined surfaces.

[0013] Furthermore, a guide rail hole is provided on the protective cover, a guide rail frame is provided on the machine head, the guide rail frame is inserted into the guide rail hole and can move axially along the guide rail hole, and the driving wheel is connected to the power component.

[0014] Furthermore, it also includes an adjusting rod and an adjusting sleeve, the adjusting rod is inserted into the sleeve, one end of the adjusting rod is connected to the guide rail frame, and the other end is located outside the sleeve and threadedly connected to the adjusting sleeve, and a spring is provided on the outer sleeve of the adjusting rod, and the two ends of the spring are respectively connected to the adjusting sleeve and the protective cover.

[0015] In summary, the present invention is beneficial in that: The ring saw of the present invention adopts a matching connection structure of a saw blade, a guide plate, a guide wheel and a driving wheel, and the driving wheel and the two guide wheels cooperate to connect the inner circumference of the saw blade to form a triangular structure, thereby forming a stable support and positioning for the saw blade, and the operation stability is strong. The support and positioning method enables the driving part of the saw blade to be located on the edge side of the saw blade, and there is no need to provide an axial support in the center of the saw blade. Therefore, the cutting depth of the saw blade can exceed the center of the saw blade and be greater than the radius of the saw blade, thereby effectively improving the cutting depth of the saw blade.

[0016] And through the connection structure of the guide wheel and the guide plate, the position of the guide wheel and the guide plate can be reasonably set to ensure that both the guide wheel and the driving wheel can maintain effective cooperation with the saw blade. Even if wear occurs, adaptive adjustments can be made to extend the service life of the saw blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the ring saw of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the cutting assembly in Example 1.

[0019] Figure 3 for Figure 2 Schematic diagram of the structure of the guide wheel part.

[0020] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the guide wheel part.

[0021] Figure 5 This is a schematic diagram of the structure of the cutting assembly in Example 2.

[0022] Figure 6 for Figure 5 Schematic diagram of the structure of the guide wheel part.

[0023] Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure of the guide wheel part.

[0024] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure of the guide frame part.

[0025] Fig. 9 This is a schematic diagram of the cross-sectional structure of the cooperation between the guide wheel and the saw blade base in Example 3.

[0026] Fig.10 for Figure 2 Schematic diagram of the structure of the water guide groove inside the center guide plate.

[0027] Fig.11 for Figure 5 Schematic diagram of the structure of the water guide groove inside the center guide plate.

[0028] Markings in the figure: 11, saw blade base; 111, flange; 112, inclined surface; 113, second abutting peripheral surface; 12, guide plate; 121, side plate; 122, water guide groove; 13, driving wheel; 14, guide wheel; 141, outer fixed wheel; 142, inner moving wheel; 143, wheel; 144, inner fixed wheel; 145, outer moving wheel; 146, roller; 147, dustproof gasket; 148, second V-shaped groove; 2, machine body; 21, handle; 3, machine head; 31, guide rail frame; 32, guide rail hole; 4, protective cover; 41, adjusting rod; 42, adjusting sleeve; 43, spring. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0031] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0033] The present invention provides a ring saw, referring to Figure 1 , including a body 2, a head 3, a protective cover 4, and a cutting component.

[0034] The body 2 is formed by connecting the left and right shells. A cavity for accommodating circuit components is provided in the body 2. A handle 21 is provided at the rear end of the body 2. A power cord is provided at the rear end of the handle 21. The head 3 is fixedly connected to the front end of the body 2. A power component for driving the cutting component is provided in the head 3. The cutting component is provided at one end of the head 3 and is connected to the power component.

[0035] The power component is preferably a motor, or other equipment that can provide rotational drive. The cutting component includes a saw blade base 11, a guide plate 12, a guide wheel 14, and a driving wheel 13. The protective cover 4 is connected to the machine head 3. An arc groove is arranged in the protective cover 4. Part of the outer periphery of the circular saw blade base 11 extends into the arc groove. The guide plate 12, the guide wheel 14, and the driving wheel 13 are all arranged on the inner peripheral side of the saw blade base 11, wherein the guide wheel 14 and the driving wheel 13 are in direct contact with the inner periphery of the saw blade base 11. The driving wheel 13 is connected to the output shaft of the power component and is used to provide rotational drive for the saw blade base 11. The guide plate 12 is used to install the guide wheel 14. The guide plate 12 is fixedly connected to the protective cover 4 to provide support and positioning for the guide wheel 14, and then the guide wheel 14 and the driving wheel 13 cooperate to support and position the saw blade base 11.

[0036] A water guide groove 122 is also provided on the guide plate 12. The water guide groove 122 includes a water inlet and multiple water outlets. The water inlet is connected to an external pipeline for injecting cooling water into the water guide groove 122. The multiple water outlets are respectively directed to the driving wheel 13 and the guide wheel 14. During cutting, water is discharged to the driving wheel 13 and the guide wheel 14 through the water outlets to achieve the purpose of cooling and removing cutting chips.

[0037] A plurality of cutting heads are arranged on the outer periphery of the saw blade base 11 . The cutting heads are connected to the saw blade base 11 by welding or other detachable connections. The model of the cutting heads can be selected as required.

[0038] The driving wheel 13 forms a frictional contact with the inner circumference of the saw blade base 11. The driving wheel 13 is provided with a first V-shaped groove recessed on the outer circumference along the circumferential direction. The inner circumference of the saw blade base 11 is symmetrically provided with inclined surfaces 112 on both sides. The inner circumference of the saw blade base 11 cooperates with the first V-shaped groove, so that the inclined surfaces 112 on both sides respectively abut against the inner walls of the first V-shaped groove on both sides, forming a relative friction force. Then, when the driving wheel 13 is driven to rotate, the saw blade base 11 is driven to rotate by the friction force.

[0039] Preferably, the inclined angle α formed by the inclined surface 112 and the radial cutting plane of the saw blade base 11 is 5° to 45°. Figure 4 , Figure 7 , Fig. 9 shown.

[0040] In the present embodiment, preferably, one driving wheel 13 is provided and two guide wheels 14 are provided. The lines connecting the center points of the three wheels of the driving wheel 13 and the guide wheel 14 form a triangular structure, thereby forming a simple, stable and effective three-point support for the inner side of the saw blade base 11, thereby ensuring the stability of the saw blade base 11 during cutting.

[0041] The guide plate 12 further includes side plates 121 . The side plates 121 are respectively disposed on both sides of the guide plate 12 and are respectively used to install two guide wheels 14 .

[0042] Further, see Figure 8 A guide rail hole 32 is provided on the protective cover 4, and a guide rail frame 31 is provided on the machine head 3. The guide rail frame 31 is inserted into the guide rail hole 32, and the guide rail frame 31 can move along the axial direction of the guide rail hole 32, that is, the machine head 3 can move relative to the protective cover 4, thereby driving the driving wheel 13 to move, and changing the relative position of the driving wheel 13 and the saw blade base 11. In the above manner, the position of the driving wheel 13 can be adjusted within a set range, so that in the direction within the radial plane of the saw blade base 11, the spacing between the driving wheel 13 and the two guide wheels 14 can be adjusted, and then when a saw blade base 11 with a different inner diameter is replaced, or when the saw blade base 11 is worn for a long time and the inner diameter changes, the spacing can be adaptively adjusted to ensure that the driving wheel 13 and the guide wheel 14 maintain stable contact and support with the inner periphery of the saw blade base 11.

[0043] The rear end of the protective cover 4 is provided with an adjusting rod 41 and an adjusting sleeve 42, one end of the adjusting rod 41 is passed through the protective cover 4 and connected to the guide rail frame 31, the other end is located outside the protective cover 4 and is threadedly connected to the adjusting sleeve 42, and a spring 43 is sleeved on the adjusting rod, the elastic ends of the spring 43 respectively abut against the adjusting sleeve 42 and the protective cover 4 to provide elastic force for the adjusting sleeve 42 and the adjusting rod 41 away from the protective cover 4, and the abutting force formed by the driving wheel 13 on the saw blade base 11 can also be adjusted by the tensioning force of the spring 43, and by rotating the adjusting sleeve 42, the adjusting rod 41 can produce an axial movement tendency, so that the adjusting rod 41 moves, or the spring 43 is compressed or relaxed. Preferably, the axial direction of the adjusting rod 41 is set to be parallel to the axial direction of the guide rail hole 32.

[0044] The present invention provides a variety of specific structures of cutting components, including: Example

[0045] Reference Figure 2 , Figure 3 and Figure 4 The left and right side plates 121 are respectively fixedly connected to the two sides of the guide plate 12. The guide wheel 14 includes an outer fixed wheel 141, an inner moving wheel 142, and a wheel piece 143. The outer fixed wheel 141 is fixedly connected to the side plate 121. The middle part of the outer fixed wheel 141 is hollowed out. The inner moving wheel 142 is arranged on the inner periphery of the outer fixed wheel 141. A plurality of rollers 146 are arranged between the outer periphery of the inner moving wheel 142 and the inner periphery of the outer fixed wheel 141. The outer fixed wheel 141 and the rollers 146 provide support, axial positioning and rotation capability for the inner moving wheel 142. There are two wheel pieces 143. The two wheel pieces 143 are respectively arranged at the axial ends of the inner moving wheel 142. The two wheel pieces 143 are fixedly connected to the inner moving wheel 142 by rivets, so that the two wheel pieces 143 are coaxial and parallel, and form a gap with a set spacing.

[0046] A flange 111 is provided on the inner periphery of the saw blade base 11 in a radially protruding manner, and the left and right side walls of the flange 111 are respectively connected with the left and right inclined surfaces 112 of the saw blade base 11, and a second abutting peripheral surface 113 for abutting against the outer peripheral wall of the wheel piece 143 is formed at the connecting position, and the second abutting peripheral surfaces 113 on both sides respectively abut against the wheel pieces 143 on both sides, and the wheel pieces 143 on both sides are respectively located on the left and right sides of the flange 111 to form an axial limit for the saw blade base 11, and the two sides of the second abutting peripheral surface 113 are respectively connected with the inclined surfaces 112 and the side walls of the flange 111 to form a set angle.

[0047] Dustproof washers 147 are protrudingly provided on both axial side surfaces of the outer fixed wheel 141, and the dustproof washers 147 are arranged at the outer periphery of the roller 146. The dustproof washers 147 are in contact with the inner sides of the two wheel plates 143 to form a seal on the inner peripheral space of the dustproof washers 147, effectively preventing dust, mud, water, etc. from invading the inner roller 146 or the inner moving wheel 142 to ensure smooth movement, while also avoiding contact between the outer fixed wheel 141 and the wheel plate 143 to ensure smooth rotation of the wheel plate 143, reduce wear, and reduce noise. Example

[0048] Reference Figure 5 , Figure 6 and Figure 7 The guide wheel 14 includes an inner fixed wheel 144 and an outer driven wheel 145. A flat groove for accommodating the inner fixed wheel 144 and the outer driven wheel 145 is provided in the side plate 121. The flat groove has a set thickness. The inner fixed wheel 144 is fixedly connected between the inner walls on both sides of the flat groove by rivets. The outer driven wheel 145 is arranged on the outer periphery of the inner fixed wheel 144. A plurality of rollers 146 are circumferentially arranged between the inner periphery of the outer driven wheel 145 and the outer periphery of the inner fixed wheel 144. The inner fixed wheel 144 and the rollers 146 provide support, axial positioning and rotation capability for the outer driven wheel 145.

[0049] The inner circumference of the saw blade base 11 is provided with a flange 111 protruding radially, and the inner circumferential wall of the flange 111 forms a first abutting circumferential surface for abutting against the outer circumferential wall of the outer driving wheel 145, so that the outer driving wheel 145 provides radial support for the saw blade base 11, and the inner walls on both sides of the flat groove of the side plate 121 are respectively located on both sides of the flange 111, providing axial limitation on both sides of the saw blade base 11, thereby forming a supporting and positioning effect for the saw blade base 11 as a whole, wherein the inclined surfaces 112 on both sides of the saw blade base 11 are respectively connected with the left and right side walls of the flange 111 to form a set angle.

[0050] Dustproof washers 147 are protrudingly provided on both axial side surfaces of the outer driven wheel 145, and the dustproof washers 147 are arranged at the outer periphery of the roller 146. The dustproof washers 147 are in contact with the inner walls on both sides of the flat groove, thereby forming a seal on the inner peripheral space of the dustproof washers 147, effectively preventing dust, mud, water, etc. from invading the inner roller 146 or the inner fixed wheel 144, ensuring smooth movement, while also avoiding contact between the outer driven wheel 145 and the inner wall of the flat groove, thereby ensuring smooth rotation of the outer driven wheel 145, reducing wear and reducing noise. Example

[0051] The guide wheel 14 includes an inner fixed wheel 144 and an outer moving wheel 145. A flat groove is provided in the side plate 121 for accommodating the inner moving wheel 142 and the outer moving wheel 145. The flat groove has a set thickness. The inner fixed wheel 144 is fixedly connected between the inner walls on both sides of the flat groove by rivets. The outer moving wheel 145 is arranged on the outer periphery of the inner fixed wheel 144. A plurality of rollers 146 are circumferentially provided between the inner periphery of the outer moving wheel 145 and the outer periphery of the inner fixed wheel 144. The inner fixed wheel 144 and the rollers 146 provide support, axial positioning and rotation capability for the outer moving wheel 145.

[0052] Reference Fig. 9 The outer driven wheel 145 is provided with a second V-shaped groove 148 recessed on the outer periphery along the circumferential direction. The inner periphery of the saw blade base 11 cooperates with the second V-shaped groove 148 so that the inclined surfaces 112 on both sides respectively abut against the inner walls of the second V-shaped groove 148 on both sides.

[0053] Dustproof washers 147 are protrudingly provided on both axial side surfaces of the outer driven wheel 145, and the dustproof washers 147 are arranged at the outer periphery of the roller 146. The dustproof washers 147 are in contact with the inner walls on both sides of the flat groove, thereby forming a seal on the inner peripheral space of the dustproof washers 147, effectively preventing dust, mud, water, etc. from invading the inner roller 146 or the inner fixed wheel 144, ensuring smooth movement, while also avoiding contact between the outer driven wheel 145 and the inner wall of the flat groove, thereby ensuring smooth rotation of the outer driven wheel 145, reducing wear and reducing noise.

[0054] In the above-mentioned Embodiment 1, Embodiment 2, and Embodiment 3, the thickness of the guide plate 12, the thickness of the guide wheel 14, and the thickness of the combined part of the guide plate 12 and the guide wheel 14 are all smaller than the thickness of the saw blade base 11 or smaller than the thickness of the cutting head, so that when cutting, the guide plate 12 and the guide wheel 14 on the inner side of the saw blade base 11 will not contact the object to be cut.

[0055] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A ring saw, characterized in that: The invention comprises a machine body (2), a machine head (3), a protective cover (4) and a cutting assembly, wherein the machine head (3) is connected to the front end of the machine body (2), the protective cover (4) is connected to the machine head (3), and the cutting assembly is connected to the protective cover (4). The cutting assembly comprises a driving wheel (13), a saw blade base (11), a guide plate (12) and two guide wheels (14), wherein the driving wheel (13), the guide plate (12) and the guide wheel (14) are arranged on the inner circumference of the saw blade base (11), the guide wheel (14) is connected to the guide plate (12), and the guide plate (12) is connected to the protective cover (4), and a power assembly for driving the driving wheel (13) to rotate is arranged in the machine head (3), and the outer circumference of the driving wheel (13) and the outer circumference of the guide wheel (14) are both in abutment with the inner circumference of the saw blade base (11).

2. A ring saw according to claim 1, characterized in that: Two inclined surfaces (112) are arranged opposite to each other on two sides of the saw blade base (11); a flange (111) is protruding from the inner periphery of the saw blade base (11); a contact peripheral surface is arranged between the side wall of the flange (111) and the inclined surface (112); the two sides of the contact peripheral surface respectively form a set angle with the side wall of the flange (111) and the inclined surface (112); and the outer peripheral wall of the guide wheel (14) contacts the contact peripheral surface.

3. A ring saw according to claim 2, characterized in that: The guide wheel (14) comprises an outer fixed wheel (141), an inner moving wheel (142) and a wheel piece (143); a side plate (121) is provided on the guide plate (12); the outer fixed wheel (141) is fixedly connected to the side plate (121); the inner moving wheel (142) is passed through the inner circumference of the outer fixed wheel (141); a plurality of rollers (146) are provided between the outer circumference of the inner moving wheel (142) and the inner circumference of the outer fixed wheel (141); the two wheel pieces (143) are respectively fixedly connected to the axial ends of the inner moving wheel (142); and the outer circumferential walls of the two wheel pieces (143) are respectively abutted against the two abutting circumferential surfaces.

4. A ring saw according to claim 1, characterized in that: Two inclined surfaces (112) are arranged opposite to each other on two sides of the saw blade base (11); a flange (111) is protruding from the inner periphery of the saw blade base (11); two side walls of the flange (111) are respectively connected to the two inclined surfaces (112) to form a set angle; and the outer peripheral wall of the guide wheel (14) abuts against the inner peripheral wall of the flange (111).

5. A ring saw according to claim 4, characterized in that: The guide wheel (14) comprises an inner fixed wheel (144) and an outer moving wheel (145); a side plate (121) is provided on the guide plate (12); a flat groove for accommodating the inner fixed wheel (144) and the outer moving wheel (145) is provided in the side plate (121); the inner fixed wheel (144) is fixedly connected in the flat groove; the outer moving wheel (145) is arranged around the outer periphery of the inner fixed wheel (144); a plurality of rollers (146) are arranged along the circumferential direction between the inner periphery of the outer moving wheel (145) and the outer periphery of the inner fixed wheel (144); and the outer peripheral wall of the outer moving wheel (145) abuts against the inner peripheral wall of the flange (111).

6. A ring saw according to claim 1, characterized in that: Two inclined surfaces (112) are arranged opposite to each other on two sides of the saw blade base (11); a first V-shaped groove for abutting against the two inclined surfaces (112) is arranged on the outer periphery of the driving wheel (13); and a second V-shaped groove (148) for abutting against the two inclined surfaces (112) is arranged on the outer periphery of the guide wheel (14).

7. A ring saw according to claim 2, 4 or 6, characterized in that: The angle formed by the inclined surface (112) and the radial plane of the saw blade base (11) is 5° to 45°.

8. A ring saw according to claim 2, 4 or 6, characterized in that: The outer periphery of the driving wheel (13) is provided with a first V-shaped groove for abutting against the two inclined surfaces (112).

9. A ring saw according to claim 1, characterized in that: The protective cover (4) is provided with a guide rail hole (32), the machine head (3) is provided with a guide rail frame (31), the guide rail frame (31) is inserted into the guide rail hole (32) and can move along the axial direction of the guide rail hole (32), and the driving wheel (13) is connected to the power assembly.

10. A ring saw according to claim 9, characterized in that: It also comprises an adjusting rod (41) and an adjusting sleeve (42), wherein the adjusting rod (41) is inserted into the sleeve, one end of the adjusting rod (41) is connected to the guide rail frame (31), and the other end is located outside the sleeve and is threadedly connected to the adjusting sleeve (42), and a spring (43) is provided on the outer periphery of the adjusting rod (41), and the two ends of the spring (43) are respectively connected to the adjusting sleeve (42) and the protective cover (4).

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