Miter saw and using method thereof

Abstract

The invention discloses a miter saw and a using method thereof, and relates to the technical field of miter saws. The safety problem is solved. The device specifically comprises a base, a rotary table is rotationally connected to the top of the base, two clamping assemblies used for clamping and fixing workpieces are arranged on the top of the rotary table, and a locking assembly used for locking the rotary table is arranged on the outer wall of the top, located on one side of the rotary table, of the base; a rotary cutting mechanism is arranged on the outer wall of the top of the other side of the base and comprises a support, a rotary arm and a saw blade, the support is fixed to the outer wall of the top of the base through bolts, the outer wall of the top of the base is rotationally connected with a telescopic device, and the telescopic end of the telescopic device is rotationally connected to the inner side wall of the rotary arm. The fixed protective cover and the movable protective cover are arranged and combined to jointly wrap the saw blade, so that after cutting is completed, the saw blade has no exposed part, a human body is prevented from being scratched by the sharp saw blade, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of miter saws, and in particular to a miter saw and a method for using the same. Background Art

[0002] Miter saws are mostly used for processing steel, stone or plate. Compared with other cutting saws, miter saws have a rotatable turntable, which allows the workpiece and the saw blade to rotate horizontally relative to each other, thereby achieving the "miter cutting" function.

[0003] After searching, the Chinese patent publication number CN219075900U discloses a miter saw, including a base, on which a vertical component, a balance board and a miter saw body are arranged; a connection interface is arranged on the miter saw body, and the connection interface fits with a connection block on the balance board below the miter saw body, so that the miter saw body can be installed on the balance board; the miter saw is provided with a locking groove near the connection interface, and a locking switch is provided on the balance board corresponding to the locking groove.

[0004] The above patent has the following deficiencies: it cannot provide all-round protection for the saw blade, and there are safety hazards when the saw blade rotates at high speed.

[0005] To this end, the present invention provides a miter saw and a method of using the same. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a miter saw and a method of using the same.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A miter saw comprises a base, the top of the base is rotatably connected to a turntable, the top of the turntable is provided with two groups of clamping components for clamping and fixing a workpiece, and the top outer wall of the base located on one side of the turntable is provided with a locking component for locking the turntable; A rotating cutting mechanism is provided on the top outer wall on the other side of the base, and the rotating cutting mechanism includes a support, a rotating arm and a saw blade. The support is fixed to the top outer wall of the base by bolts, and the top outer wall of the base is rotatably connected to a telescope, and the telescopic end of the telescope is rotatably connected to the inner side wall of the rotating arm, one end of the rotating arm is rotatably connected to the side wall of the support through a main shaft, and the saw blade is connected to the other end of the rotating arm through a driving mechanism, and a fixed protective cover is fixed to one end of the rotating arm located at the saw blade, and a movable protective cover is rotatably connected to the saw blade through a connecting shaft, and the fixed protective cover and the movable protective cover can be combined to completely wrap the saw blade.

[0008] Preferably, the main shaft and the connecting shaft are coupled through a linkage assembly.

[0009] Furthermore: the linkage assembly includes two pulleys respectively fixed to the main shaft and the outer wall of the connecting shaft and a synchronous belt that is transmitted and matched with the outer walls of the two pulleys. The connecting shaft is rotatably connected to the side wall of the rotating arm, the movable protective cover is fixedly connected to the connecting shaft, the main shaft is fixedly connected to the support, and the rotating arm is rotatably connected to the outer wall of the main shaft.

[0010] On the basis of the above scheme: the driving mechanism includes a driving shaft, a synchronous belt and a motor, the driving shaft is rotatably connected to the inner wall of the rotating arm, the saw blade is transmission-coordinated with the driving shaft, the motor is fixed to the side wall of the rotating arm by bolts, and the synchronous belt is transmission-coordinated with the outer wall of the driving shaft and the output shaft of the motor.

[0011] A better solution among the above solutions is: the clamping assembly includes a support roller, a gantry and a clamping plate, the gantry is fixed to the top outer wall of the turntable by bolts, the support roller is rotatably connected to the bottom inner side of the turntable, and the clamping plate is slidably connected to the top inner side of the gantry through a guide rod.

[0012] As a further solution of the present invention: the top of the clamping plate is rotatably connected with a threaded rod, and the threaded rod is connected to the inner wall of the gantry through threads.

[0013] At the same time, the locking assembly includes a support plate and a tooth block that engages with the tooth groove on the outside of the turntable. The support plate is fixed to the top outer wall of the base by bolts, and the tooth block is slidably connected to the side wall of the support plate by a sliding rod. The inner end surface of the end of the sliding rod is buckled with a spring 1, and the other end of the spring 1 is buckled to the side wall of the support plate.

[0014] As a preferred embodiment of the present invention: a cutting shaft is fixed to the inner wall of the axis of the saw blade, both ends of the cutting shaft are rotatably connected to sliders, the inner wall of the rotating arm is provided with a sliding groove that slidably cooperates with the slider, the end face of the slider is buckled with spring 2, the other end of spring 2 is buckled to the inner wall of the sliding groove, the outer wall of the cutting shaft is connected to gear 2 via a key, and the outer wall of the driving shaft is connected to gear 1 that meshes with gear 2 via a key.

[0015] At the same time, a friction ring is fixed to the outer wall of the other side of the cutting shaft, and a friction tile that contacts and cooperates with the friction ring is fixed to the inner side of the rotating arm.

[0016] A method for using a miter saw comprises the following steps: S1: The workpiece is fixed. The workpiece to be cut is placed above the support roller and slides along the support roller to adjust the cutting position. After the adjustment is completed, the threaded rod is rotated, and the threaded rod drives the clamping plate to descend to clamp and fix the workpiece; S2: Cutting angle adjustment, pull the slide bar, at this time the spring 1 is compressed, and the gear block is disengaged from the turntable, and the turntable can rotate freely. When the adjustment is completed, release the slide bar, and the slide bar is reset by the pulling force of spring 1, so that the gear block is engaged with the turntable, and the turntable is locked. The lock assembly is used to lock the turntable; S3: Cutting. When the saw blade cuts the workpiece, there will be contact pressure between the saw blade and the workpiece, which will cause the saw blade to move upward, the slider moves upward, spring two is compressed, and gear one is meshed with gear two. At this time, the drive shaft rotates to drive the saw blade to rotate. When it is not in the cutting state, the saw blade is not subjected to contact pressure. At this time, the slider will move downward due to gravity and the elastic force of spring two, thereby separating gear one from gear two, and the saw blade is not driven.

[0017] The beneficial effects of the present invention are: 1. The present invention provides a fixed protective cover and a movable protective cover, and the combination of the fixed protective cover and the movable protective cover can wrap the saw blade together, so that after cutting, there is no exposed part of the saw blade, which prevents the human body from being scratched by the sharp saw blade and increases safety.

[0018] 2. The present invention sets a linkage assembly so that the rotation of the movable protective cover and the rotation of the rotating arm are synchronously reversed, thereby ensuring protection in a non-cutting state on the one hand and avoiding in a cutting state on the other hand, thereby increasing synchronization and simplifying the control logic.

[0019] 3. The present invention, by configuring the clamping assembly as a combination of a support roller and a clamping plate, can utilize the rotation of the support roller to make the workpiece position adjustment more labor-saving and prevent friction damage on the one hand, and can also utilize the clamping plate for clamping to increase cutting stability on the other hand.

[0020] 4. The present invention, by providing a locking assembly, can lock the position of the turntable through the engagement of the tooth block with the turntable, thereby increasing the stability of the workpiece during cutting. On the other hand, the turntable can be locked and released only by operating the slide bar, which increases the convenience of operation.

[0021] 5. The present invention sets a detachable meshing mode between gear 1 and gear 2, so that the saw blade is not driven in a non-cutting state, which saves energy and increases safety. At the same time, the separation and meshing of gear 1 and gear 2 are achieved by utilizing the contact pressure between the saw blade and the workpiece, thereby eliminating the need for manual control or electric control algorithms, simplifying the control logic and driving power.

[0022] 6. The present invention, by providing a friction ring and a friction tile, can make use of the friction force of the friction ring and the friction tile to quickly slow down and stop the saw blade from rotating when the saw blade is not driven, thereby further increasing the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of a miter saw proposed by the present invention; Figure 2 A schematic diagram of the structure of a rotary cutting mechanism of a miter saw proposed by the present invention; Figure 3 A schematic diagram of the linkage assembly structure of a miter saw proposed by the present invention; Figure 4 A schematic diagram of the driving mechanism structure of a miter saw proposed by the present invention; Figure 5 A schematic diagram of the structure of a clamping assembly of a miter saw proposed by the present invention; Figure 6 A schematic diagram of the locking assembly structure of a miter saw proposed by the present invention; Figure 7 This is a schematic structural diagram of gear 1, gear 2 and their connecting parts of a miter saw proposed by the present invention; Figure 8 This is a schematic diagram of the friction ring and friction tile structure of a miter saw proposed by the present invention.

[0024] In the figure: 1. base; 2. rotary cutting mechanism; 3. locking assembly; 4. turntable; 5. clamping assembly; 6. support; 7. linkage assembly; 8. rotating arm; 9. fixed protective cover; 10. saw blade; 11. movable protective cover; 12. telescope; 13. main shaft; 14. pulley; 15. synchronous belt one; 16. connecting shaft; 17. driving shaft; 18. synchronous belt two; 19. motor; 20. support roller; 21. gantry; 22. splint; 23. guide rod; 24. threaded rod; 25. tooth block; 26. slide rod; 27. support plate; 28. spring one; 29. ​​gear one; 30. gear two; 31. slide groove; 32. cutting shaft; 33. slider; 34. spring two; 35. friction ring; 36. friction tile. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] Embodiment 1: A miter saw, such as Figure 1-Figure 8As shown, it includes a base 1, the top of which is rotatably connected to a turntable 4, two groups of clamping components 5 for clamping and fixing the workpiece are arranged on the top of the turntable 4, and a locking component 3 for locking the turntable 4 is arranged on the top outer wall of the base 1 located on one side of the turntable 4.

[0028] A rotating cutting mechanism 2 is provided on the top outer wall on the other side of the base 1, and the rotating cutting mechanism 2 includes a support 6, a rotating arm 8 and a saw blade 10. The support 6 is fixed to the top outer wall of the base 1 by bolts, and the top outer wall of the base 1 is rotatably connected to a telescope 12, and the telescopic end of the telescope 12 is rotatably connected to the inner wall of the rotating arm 8. One end of the rotating arm 8 is rotatably connected to the side wall of the support 6 through a main shaft 13, and the saw blade 10 is connected to the other end of the rotating arm 8 through a driving mechanism, and a fixed protective cover 9 is fixed to one end of the rotating arm 8 located at the saw blade 10, and a movable protective cover 11 is rotatably connected to the saw blade 10 through a connecting shaft 16. The combination of the fixed protective cover 9 and the movable protective cover 11 can completely wrap the saw blade 10.

[0029] The main shaft 13 and the connecting shaft 16 are coupled to each other through a linkage assembly 7 .

[0030] The linkage assembly 7 includes two pulleys 14 respectively fixed to the outer wall of the main shaft 13 and the connecting shaft 16, and a synchronous belt 15 that is transmission-matched with the outer walls of the two pulleys 14. The connecting shaft 16 is rotatably connected to the side wall of the rotating arm 8, and the movable protective cover 11 is fixedly connected to the connecting shaft 16. The main shaft 13 is fixedly connected to the support 6, and the rotating arm 8 is rotatably connected to the outer wall of the main shaft 13.

[0031] When the device is in use, the workpiece can be fixed by the clamping assembly 5, and then the turntable 4 is rotated to adjust the workpiece to the cutting angle, and the turntable 4 is locked by the locking assembly 3. The telescopic device 12 contracts to drive the rotating arm 8 to rotate downward. When the rotating arm 8 rotates, the two pulleys 14 will also rotate relative to each other along the rotation center of the rotating arm 8. Combined with the pulley 14 on the main shaft 13 being in a stationary state, the pulley 14 on the connecting shaft 16 is rotated, thereby driving the movable protective cover 11 to rotate, so that the saw blade 10 is partially exposed for cutting. After the cutting is completed, the rotating arm 8 is reset, thereby resetting the movable protective cover 11, and the movable protective cover 11 and the fixed protective cover 9 together wrap the saw blade 10.

[0032] The device is provided with a fixed protective cover 9 and a movable protective cover 11, and the combination of the fixed protective cover 9 and the movable protective cover 11 can wrap the saw blade 10 together, so that after cutting, there is no exposed part of the saw blade 10, which prevents the human body from being scratched by the sharp saw blade 10 and increases safety.

[0033] In addition, the device is provided with a linkage component 7 so that the rotation of the movable protective cover 11 is synchronously reversed with the rotation of the rotating arm 8, thereby ensuring protection in a non-cutting state on the one hand and avoiding in a cutting state on the other hand, thereby increasing synchronization and simplifying the control logic.

[0034] To solve the driver problem; Figure 4 As shown, the driving mechanism includes a driving shaft 17, a synchronous belt 18 and a motor 19. The driving shaft 17 is rotatably connected to the inner wall of the rotating arm 8, the saw blade 10 is in transmission cooperation with the driving shaft 17, the motor 19 is fixed to the side wall of the rotating arm 8 by bolts, and the synchronous belt 18 is in transmission cooperation with the driving shaft 17 and the outer wall of the output shaft of the motor 19.

[0035] When the motor 19 is started, it can drive the drive shaft 17 to rotate through the synchronous belt 18, thereby driving the saw blade 10 to rotate and perform sawing operations.

[0036] To solve the clamping problem; Figure 5 As shown, the clamping assembly 5 includes a support roller 20, a gantry 21 and a clamping plate 22. The gantry 21 is fixed to the top outer wall of the turntable 4 by bolts, the support roller 20 is rotatably connected to the bottom inner side of the turntable 4, the clamping plate 22 is slidably connected to the top inner side of the gantry 21 through a guide rod 23, and the top of the clamping plate 22 is rotatably connected to a threaded rod 24, which is connected to the inner wall of the gantry 21 by threads.

[0037] When in use, the workpiece to be cut is placed above the support roller 20, and the cutting position is adjusted by sliding along the support roller 20. After the adjustment is completed, the threaded rod 24 is rotated, and the threaded rod 24 drives the clamping plate 22 to descend to clamp and fix the workpiece.

[0038] The device, by configuring the clamping assembly 5 as a combination of a support roller 20 and a clamping plate 22, can utilize the rotation of the support roller 20 to make the workpiece position adjustment more labor-saving and prevent friction damage, and can also utilize the clamping plate 22 for clamping to increase cutting stability.

[0039] In order to solve the locking problem; Figure 6 As shown, the locking assembly 3 includes a support plate 27 and a tooth block 25 that engages with the tooth groove on the outer side of the turntable 4. The support plate 27 is fixed to the top outer wall of the base 1 by bolts, and the tooth block 25 is slidably connected to the side wall of the support plate 27 by a sliding rod 26. The inner end surface of the end of the sliding rod 26 is buckled with a spring 28, and the other end of the spring 28 is buckled to the side wall of the support plate 27.

[0040] When the angle of the turntable 4 needs to be adjusted, the slide bar 26 can be pulled, and the spring 28 is compressed. At this time, the tooth block 25 is disengaged from the turntable 4, and the turntable 4 can rotate freely. When the adjustment is completed, the slide bar 26 is released, and the slide bar 26 is reset by the pulling force of the spring 28, so that the tooth block 25 is engaged with the turntable 4, and the turntable 4 is locked.

[0041] The device is provided with a locking assembly 3, which can lock the position of the turntable 4 through the engagement of the tooth block 25 with the turntable 4, thereby increasing the stability of the workpiece during cutting. On the other hand, the turntable 4 can be locked and released only by operating the slide bar 26, which increases the convenience of operation.

[0042] To solve security issues; Figure 7 , 8 As shown, a cutting shaft 32 is fixed to the inner wall of the axis of the saw blade 10, and sliders 33 are rotatably connected at both ends of the cutting shaft 32. A sliding groove 31 that slidably cooperates with the slider 33 is opened on the inner wall of the rotating arm 8. A spring 34 is buckled on the end face of the slider 33, and the other end of the spring 34 is buckled on the inner wall of the sliding groove 31.

[0043] The outer wall of the cutting shaft 32 is connected to the gear 2 30 via a key, and the outer wall of the driving shaft 17 is connected to the gear 1 29 meshing with the gear 2 30 via a key.

[0044] When the saw blade 10 cuts the workpiece, there will be contact pressure between the saw blade 10 and the workpiece, so that the saw blade 10 will move upward, the slider 33 will move upward, the spring 2 34 will be compressed, and at the same time, gear 1 29 will mesh with gear 2 30. At this time, the rotation of the drive shaft 17 can drive the saw blade 10 to rotate. When it is not in the cutting state, the saw blade 10 is not subjected to contact pressure. At this time, the slider 33 will move downward due to gravity and the elastic force of spring 2 34, thereby separating gear 1 29 from gear 2 30, and the saw blade 10 is not driven.

[0045] The device sets a detachable meshing mode between gear 1 29 and gear 2 30, so that the saw blade 10 is not driven in a non-cutting state, which saves energy and increases safety. At the same time, the separation and meshing of gear 1 29 and gear 2 30 are achieved by the contact pressure between the saw blade 10 and the workpiece, thereby eliminating the need for manual control or electronic control algorithms, simplifying the control logic and driving power.

[0046] A friction ring 35 is fixed to the outer wall of the other side of the cutting shaft 32 , and a friction tile 36 contacting and cooperating with the friction ring 35 is fixed to the inner side of the rotating arm 8 .

[0047] When the cutting shaft 32 is reset, the friction ring 35 is in contact with the friction tile 36 , and the friction force between the friction ring 35 and the friction tile 36 is used to quickly reduce the speed of the saw blade 10 .

[0048] The device, by providing the friction ring 35 and the friction tile 36, can use the friction force of the friction ring 35 and the friction tile 36 to quickly slow down and stop the saw blade 10 when the saw blade 10 is not driven, thereby further increasing the safety of use.

[0049] When the present embodiment is in use, the workpiece to be cut is placed above the support roller 20 and the cutting position is adjusted by sliding along the support roller 20. After the adjustment is completed, the threaded rod 24 is rotated, and the threaded rod 24 drives the clamping plate 22 to descend to clamp and fix the workpiece. When the angle of the turntable 4 needs to be adjusted, the sliding rod 26 can be pulled, and the spring 28 is compressed at this time, and the tooth block 25 is disengaged from the turntable 4, and the turntable 4 can rotate freely. When the adjustment is completed, the sliding rod 26 is released, and the sliding rod 26 is reset by the pulling force of the spring 28, so that the tooth block 25 is engaged with the turntable 4, and the turntable 4 is locked. The turntable 4 is locked by the locking assembly 3, and the telescopic device 12 is contracted to drive the rotating arm 8 to rotate downward. When the rotating arm 8 rotates, the two pulleys 14 will also have a relative rotational movement along the rotation center of the rotating arm 8, and combined with the pulley 14 on the main shaft 13 is in a stationary state, so that the connecting shaft 1 The pulley 14 on 6 rotates, thereby driving the movable protective cover 11 to rotate, so that the saw blade 10 is partially exposed for cutting. After cutting is completed, the rotating arm 8 is reset, thereby resetting the movable protective cover 11. The movable protective cover 11 and the fixed protective cover 9 wrap the saw blade 10 together. When the motor 19 is started, it can drive the drive shaft 17 to rotate through the synchronous belt 18. When the saw blade 10 cuts the workpiece, there will be contact pressure between the saw blade 10 and the workpiece, so that the saw blade 10 will move upward, the slider 33 moves upward, the spring 2 34 is compressed, and the gear 1 29 is meshed with the gear 2 30. At this time, the rotation of the drive shaft 17 can drive the saw blade 10 to rotate. When it is not in the cutting state, the saw blade 10 is not subjected to contact pressure. At this time, the slider 33 is affected by gravity and the elastic force of the spring 2 34 and moves downward, so that the gear 1 29 is separated from the gear 2 30, and the saw blade 10 is not driven.

[0050] Embodiment 2: A method for using a miter saw, comprising the following steps: S1: The workpiece is fixed, the workpiece to be cut is placed above the support roller 20, and the cutting position is adjusted by sliding along the support roller 20. After the adjustment is completed, the threaded rod 24 is rotated, and the threaded rod 24 drives the clamping plate 22 to descend to clamp and fix the workpiece; S2: Cutting angle adjustment, pull the slide bar 26, at this time the spring 28 is compressed, and the tooth block 25 is disengaged from the turntable 4, and the turntable 4 can rotate freely. When the adjustment is completed, release the slide bar 26, and the slide bar 26 is reset by the pulling force of the spring 28, so that the tooth block 25 is engaged with the turntable 4, and the turntable 4 is locked, and the lock assembly 3 is used to lock the turntable 4; S3: Cutting. When the saw blade 10 cuts the workpiece, there will be contact pressure between the saw blade 10 and the workpiece, so that the saw blade 10 will move upward, the slider 33 will move upward, the spring 2 34 will be compressed, and at the same time, gear 1 29 will mesh with gear 2 30. At this time, the rotation of the drive shaft 17 can drive the saw blade 10 to rotate. When it is not in the cutting state, the saw blade 10 is not subjected to contact pressure. At this time, the slider 33 will move downward due to gravity and the elastic force of spring 2 34, thereby separating gear 1 29 from gear 2 30, and the saw blade 10 is not driven.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A miter saw, comprising a base (1), characterized in that: The top of the base (1) is rotatably connected to a turntable (4), and two groups of clamping components (5) for clamping and fixing a workpiece are arranged on the top of the turntable (4). A locking component (3) for locking the turntable (4) is arranged on the top outer wall of the base (1) located on one side of the turntable (4); A rotary cutting mechanism (2) is arranged on the top outer wall of the other side of the base (1), and the rotary cutting mechanism (2) comprises a support (6), a rotary arm (8) and a saw blade (10). The support (6) is fixed to the top outer wall of the base (1) by bolts, and the top outer wall of the base (1) is rotatably connected to a telescopic device (12), and the telescopic end of the telescopic device (12) is rotatably connected to the inner side wall of the rotary arm (8). One end of the rotary arm (8) is rotatably connected to the side wall of the support (6) through a main shaft (13), and the saw blade (10) is connected to the other end of the rotary arm (8) through a driving mechanism, and a fixed protective cover (9) is fixed to one end of the rotary arm (8) located at the saw blade (10), and a movable protective cover (11) is rotatably connected to the saw blade (10) through a connecting shaft (16). The combination of the fixed protective cover (9) and the movable protective cover (11) can completely wrap the saw blade (10).

2. A miter saw according to claim 1, characterized in that: The main shaft (13) and the connecting shaft (16) are in transmission cooperation via a linkage assembly (7).

3. A miter saw according to claim 2, characterized in that: The linkage assembly (7) comprises two pulleys (14) respectively fixed to the outer wall of the main shaft (13) and the connecting shaft (16), and a synchronous belt (15) drivingly matched with the outer wall of the two pulleys (14); the connecting shaft (16) is rotatably connected to the side wall of the rotating arm (8); the movable protective cover (11) is fixedly connected to the connecting shaft (16); the main shaft (13) is fixedly connected to the support (6); and the rotating arm (8) is rotatably connected to the outer wall of the main shaft (13).

4. The miter saw according to claim 1, characterized in that: The driving mechanism comprises a driving shaft (17), a second synchronous belt (18) and a motor (19); the driving shaft (17) is rotatably connected to the inner side wall of the rotating arm (8); the saw blade (10) is in transmission cooperation with the driving shaft (17); the motor (19) is fixed to the side wall of the rotating arm (8) by bolts; and the second synchronous belt (18) is in transmission cooperation with the driving shaft (17) and the outer wall of the output shaft of the motor (19).

5. The miter saw according to claim 1, characterized in that: The clamping assembly (5) comprises a supporting roller (20), a gantry (21) and a clamping plate (22); the gantry (21) is fixed to the top outer wall of the turntable (4) by bolts; the supporting roller (20) is rotatably connected to the bottom inner side of the turntable (4); and the clamping plate (22) is slidably connected to the top inner side of the gantry (21) by a guide rod (23).

6. A miter saw according to claim 5, characterized in that: The top of the clamping plate (22) is rotatably connected to a threaded rod (24), and the threaded rod (24) is connected to the inner wall of the gantry (21) through threads.

7. The miter saw according to claim 1, characterized in that: The locking assembly (3) comprises a support plate (27) and a tooth block (25) engaged with a tooth groove on the outer side of the turntable (4); the support plate (27) is fixed to the top outer wall of the base (1) by bolts; the tooth block (25) is slidably connected to the side wall of the support plate (27) by a slide rod (26); a spring 1 (28) is buckled on the inner end surface of the end of the slide rod (26); and the other end of the spring 1 (28) is buckled to the side wall of the support plate (27).

8. The miter saw according to claim 4, characterized in that: A cutting shaft (32) is fixed to the inner wall of the axis of the saw blade (10), and sliders (33) are rotatably connected to both ends of the cutting shaft (32). A sliding groove (31) slidably matched with the slider (33) is formed on the inner wall of the rotating arm (8), and a spring (34) is buckled on the end surface of the slider (33), and the other end of the spring (34) is buckled on the inner wall of the sliding groove (31). The outer wall of the cutting shaft (32) is connected to a gear (30) via a key, and the outer wall of the driving shaft (17) is connected to a gear (29) meshing with the gear (30) via a key.

9. The miter saw according to claim 8, characterized in that: A friction ring (35) is fixed to the outer wall of the other side of the cutting shaft (32), and a friction tile (36) in contact with the friction ring (35) is fixed to the inner side of the rotating arm (8).

10. A method for using a miter saw, characterized in that: The following steps are involved: S1: The workpiece is fixed, the workpiece to be cut is placed above the support roller (20), and the cutting position is adjusted by sliding along the support roller (20). After the adjustment is completed, the threaded rod (24) is rotated, and the threaded rod (24) drives the clamping plate (22) to descend to clamp and fix the workpiece; S2: Cutting angle adjustment, pull the slide bar (26), at this time the spring 1 (28) is compressed, and the tooth block (25) is disengaged from the turntable (4), and the turntable (4) can rotate freely. When the adjustment is completed, release the slide bar (26), and the slide bar (26) is reset by the pulling force of the spring 1 (28), so that the tooth block (25) and the turntable (4) are engaged, and the turntable (4) is locked. The lock assembly (3) is used to lock the turntable (4); S3: Cutting. When the saw blade (10) cuts the workpiece, there is contact pressure between the saw blade (10) and the workpiece, so that the saw blade (10) moves upward, the slider (33) moves upward, the spring two (34) is compressed, and the gear one (29) and the gear two (30) are meshed. At this time, the drive shaft (17) rotates to drive the saw blade (10) to rotate. When not in the cutting state, the saw blade (10) is not subjected to contact pressure. At this time, the slider (33) is subjected to gravity and the elastic force of the spring two (34) and moves downward, so that the gear one (29) and the gear two (30) are separated, and the saw blade (10) is not driven.

Images