Machine head angle adjusting mechanism of cutting tool

Abstract

The invention discloses a machine head angle adjusting mechanism of a cutting tool, which comprises a supporting seat, a machine head of the supporting seat and a locking disc, the locking disc is fixedly connected to the supporting seat, the locking disc is provided with a plurality of locking holes which are arranged at intervals and have specific angles, the machine head is internally provided with a containing hole for a locking pin to stretch and retract back and forth, and the containing hole is internally provided with an elastic piece. The rear end of the locking pin is in linkage with the transmission mechanism through the linkage mechanism, the locking switch is in transmission connection with the locking block through the transmission mechanism, and when the locking switch swings in a reciprocating mode, the transmission mechanism drives the locking block to move between the locking disc clamping position and the locking disc loosening position in a reciprocating mode. The locking pin can move in a reciprocating mode between the position where the locking pin is inserted into the locking hole or the position where the locking pin is separated from the locking hole through cooperation of the linkage mechanism and the elastic piece, and therefore automatic locking and unlocking of the machine head and the supporting base at a specific angle are achieved. The machine head angle adjusting mechanism is convenient and fast to operate and good in locking effect.

Description

Technical Field

[0001] The invention relates to the technical field of cutting tools, and in particular to a head angle adjustment mechanism of a cutting tool. Background Art

[0002] Miter saws mainly use high-speed rotating saw blades to effectively cut various materials, such as metal, wood, plastic, etc. The inclined design of the saw blade allows the sawdust generated during the cutting process to be discharged smoothly, thereby ensuring cutting efficiency and quality. Miter saws are a type of bench tool that can perform cutting operations at a certain inclined angle, usually including a rotating and tilting cutting device and a rotating workbench.

[0003] The existing miter saw includes a base, a workbench arranged on the base, and a cutting device located above the workbench. A support seat is arranged at the rear end of the workbench. The cutting device includes a head swingably connected to the support seat, a guide rail assembly slidably arranged on the head, a connecting piece connected to the front end of the guide rail assembly, and a cutting assembly pivotally connected to the connecting piece. The head of the cutting device needs to be locked after swinging relative to the support seat. In the prior art, the head locking structure of the cutting device is relatively complex, and the locking method is relatively single, which affects the user experience. Summary of the invention

[0004] The purpose of the present invention is to provide a machine head angle adjustment mechanism for a cutting tool, which can adjust the machine head to a specific angle and an arbitrary angle by using the same locking switch, and has convenient and quick operation and good locking effect.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a machine head angle adjustment mechanism for a cutting tool, comprising a support seat arranged at the rear end of a workbench, a machine head swingably connected to the support seat, and a locking disk arranged between the machine head and the support seat, the locking disk is fixedly connected to the support seat, and also includes a locking block, a locking pin, a transmission mechanism, a linkage mechanism and a locking switch, the locking disk is provided with a plurality of locking holes arranged at intervals and having a specific angle, the locking hole is arranged on the swinging trajectory of the locking pin, a receiving hole for the locking pin to be extended and retracted forward and backward is provided in the machine head, an elastic member for driving the locking pin to move toward the direction of inserting into the locking hole is provided in the receiving hole, the rear end of the locking pin is linked with the transmission mechanism through a linkage mechanism, the locking switch is connected to the locking block through the transmission mechanism, when the locking switch swings back and forth, the locking block is driven by the transmission mechanism to reciprocate between the clamping locking disk position and the releasing locking disk position, thereby realizing the locking and unlocking of the machine head and the support seat at any angle, the locking pin can reciprocate between the insertion locking hole position or the disengagement locking hole position through the linkage mechanism and the elastic member, thereby realizing the automatic locking and unlocking of the machine head and the support seat at a specific angle.

[0006] Furthermore, the locking switch can be switched among a first position, a second position and a third position, the second position being between the first position and the third position, and when the locking switch is pressed to the first position, the machine head and the support seat are in an unlocked state, and the machine head can swing at any angle relative to the support seat; after releasing the locking switch pressed to the first position, when the operator swings the machine head to a required specific angle, the locking pin can be automatically inserted into the locking hole of the locking disk opposite to it under the action of the elastic member, and the machine head and the support seat are automatically locked at a specific angle; when the locking switch is pressed to the third position, the locking block moves to the position of the clamping locking disk, and the machine head and the support seat are locked as a whole through the locking cooperation of the locking block and the locking disk.

[0007] Furthermore, the transmission mechanism includes a rotating shaft, a first bevel gear, a second bevel gear, and a screw. The rotating shaft is rotatably arranged in the machine head, the locking switch is fixedly connected to the end of the rotating shaft, the first bevel gear is fixedly connected to the rotating shaft, the screw is arranged along the front and rear directions and passes through the locking plate, the locking plate is provided with an arc-shaped avoidance groove for the screw to swing left and right, the second bevel gear is fixedly connected to the screw and meshes with the first bevel gear for transmission, the front end of the screw is threadedly connected to the locking block, the locking block is matched with the support seat to stop rotation, and when the locking switch swings, it will drive the screw to drive the locking block to move between the clamping locking plate position and the loosening locking plate position, thereby realizing the locking and unlocking of the machine head and the support seat.

[0008] Furthermore, the support seat is provided with a limiting protrusion, and a movable space for the locking block to move forward and backward is formed between the limiting protrusion and the locking plate. The locking block is limited by the limiting protrusion to prevent the locking block from being separated from the screw.

[0009] Furthermore, the linkage mechanism includes a linkage member movably mounted on the rotating shaft, a first linkage pin fixedly connected to the rotating shaft, and a second linkage pin fixedly connected to the rear end of the locking pin. The first end of the linkage member is provided with a toggle portion corresponding to the position of the first linkage pin, and the second end of the linkage member is maintained in a state of conflict with the second linkage pin.

[0010] Furthermore, the second linkage pin is arranged horizontally along the left and right directions, and the second linkage pin is abutted against the rear side of the second end of the linkage member. The linkage member has a tendency to rotate forward under the abutment of the second linkage pin. When the locking switch is switched to the first position, the first locking pin can drive the toggle part and the linkage member to rotate backward, thereby driving the locking pin to move to a position out of the locking hole.

[0011] Furthermore, when the locking switch is rotated from the second position to the first position, the first linkage pin can drive the toggle part to rotate downward, so that the linkage part drives the second linkage pin to move away from the locking disk until the locking pin is completely disengaged from the locking hole; when the locking switch pressed to the first position is released, the locking pin moves in the direction of the insertion locking hole under the elastic force of the elastic part, so that the second linkage pin drives the linkage part to reset, and at this time, the toggle part of the linkage part drives the first linkage part to reset, thereby resetting the rotating shaft and the locking switch to the second position.

[0012] Furthermore, a step portion is provided in the accommodating cavity, an abutment ring is provided on the locking pin, the elastic member is sleeved on the locking pin, one end of the elastic member abuts against the step portion, and the other end of the elastic member abuts against the abutment ring.

[0013] Furthermore, both ends of the machine head are respectively fixedly connected with locking switches that cooperate with the transmission mechanism.

[0014] Furthermore, the locking disk has a locking position extending upward from the support seat, and a plurality of locking holes are distributed at intervals along an arc track at the locking position of the locking disk.

[0015] Furthermore, a dial is fixedly connected to the upper end of the support seat, and a pointer used in conjunction with the dial is provided on the machine head.

[0016] In summary, the present invention has the following beneficial effects: the present invention can adjust the machine head to a specific angle (common working angle) and any angle using the same locking switch, has more diverse functions, is convenient and quick to operate, and has a good locking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a cutting tool.

[0018] Figure 2 It is a schematic diagram of the installation position structure of the locking disk of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the locking disk of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the locking mechanism of the present invention.

[0021] Figure 5 It is a schematic diagram of the transmission mechanism and linkage mechanism of the present invention.

[0022] Figure 6 It is an exploded schematic diagram of the transmission mechanism and linkage mechanism of the present invention.

[0023] In the figure: 10, base; 20, workbench; 21, support seat; 211, limit protrusion; 212, activity space; 213, dial; 30, cutting device; 31, machine head; 311, elastic member; 312, pointer; 32, guide rail assembly; 33, cutting assembly; 40, locking mechanism; 41, locking plate; 411, locking hole; 412, arc-shaped avoidance groove; 42, locking block; 43, locking pin; 44, transmission mechanism; 441, rotating shaft; 442, first bevel gear; 443, second bevel gear; 444, screw; 45, linkage mechanism; 451, linkage member; 4511, toggle part; 452, first linkage pin; 453, second linkage pin; 46, locking switch. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] In order to facilitate the description of the technical solution of the present invention, the following is also defined: Figure 1 The up, down, front, back, left and right indicated by the arrows in the figure. Figure 1 Take the state of the cutting tool in as an example.

[0026] like Figure 1-Figure 6 As shown, the cutting tool, specifically a miter saw, includes a base 10, a workbench 20 arranged on the base 10, and a cutting device 30 located above the workbench 20. A support seat 21 is arranged at the rear end of the workbench 20. The cutting device 30 includes a machine head 31 swingably connected to the support seat 21, a guide rail assembly 32 slidably arranged on the machine head 31, a connecting member connected to the front end of the guide rail assembly 32, and a cutting assembly 33 pivotally connected to the connecting member.

[0027] The machine head angle adjustment mechanism of the cutting tool of the present invention includes a support base 21 arranged at the rear end of the workbench 20, a machine head 31 swingably connected to the support base 21, and a locking disk 41 arranged between the machine head 31 and the support base 21. Specifically, the machine head 31 is rotatably connected to the support base 21 through a connecting shaft, that is, the machine head 31 can swing left and right around the connecting shaft, thereby realizing the cutting device 30 swinging left and right relative to the workbench 20.

[0028] The locking disk 41 is fixedly connected to the support seat 21 , and the locking disk 41 is also a brake disk. The locking disk 41 has a locking position extending upward from the support seat 21 . Specifically, the front end of the locking disk 41 abuts against the support seat 21 , and the rear end surface of the locking disk 41 abuts against the machine head 31 .

[0029] The head angle adjustment mechanism also includes a locking block 42, a locking pin 43, a transmission mechanism 44, a linkage mechanism 45 and a locking switch 46. The locking block 42 has a locking tooth on the side facing the locking disk 41, and the locking disk 41 can be clamped with the locking disk 41 through the locking tooth to achieve locking. The locking disk 41 is provided with a plurality of locking holes 411 which are spaced apart and have specific angles. The locking holes 411 are arranged on the swinging trajectory of the locking pin 43. The plurality of locking holes 411 are spaced apart in an arc shape with the connecting shaft as the center. Specifically, the positions of the locking holes 411 are all arranged within the path range of rotation of the locking pin 43. The angle between the connecting line formed by the center of the locking hole 411 and the center of the connecting shaft and the vertical line includes but is not limited to -45°, -33.9°, -22.5°0°, 22.5°, 33.9° and 45°. Of course, other specific angles can be designed as needed.

[0030] The machine head 31 is provided with an accommodating hole for the locking pin 43 to extend and retract forward and backward. The accommodating hole plays a guiding and limiting role to ensure that the locking pin 43 can only extend and retract along the length direction of the accommodating hole. An elastic member 311 is provided in the accommodating hole to drive the locking pin 43 to move in the direction of inserting into the locking hole 411. The rear end of the locking pin 43 is linked with the transmission mechanism 44 through a linkage mechanism 45. The locking switch 46 is connected to the locking block 42 through the transmission mechanism 44. When the locking switch 46 swings back and forth, the locking block 42 is driven by the transmission mechanism 44 to reciprocate between the clamping locking disk position and the releasing locking disk position, thereby realizing the locking and unlocking of the machine head 31 and the support seat 21 at any angle. The locking pin 43 can reciprocate between the insertion locking hole position or the disengagement locking hole position through the linkage mechanism 45 and the elastic member 311, thereby realizing the automatic locking and unlocking of the machine head 31 and the support seat 21 at a specific angle.

[0031] The locking switch 46 can be switched among a first position, a second position and a third position, and the second position is between the first position and the third position. In the present invention, the first position is the position where the locking switch 46 swings to the rear end, and the third position is the position where the locking switch 46 swings to the front end. When the locking switch 46 is pressed to the first position, the machine head 31 and the support seat 21 are in an unlocked state, and the machine head 31 can swing at any angle relative to the support seat 21; after releasing the locking switch 46 pressed to the first position, when the operator swings the machine head 31 to the required specific angle, the locking pin 43 can be automatically inserted into the locking hole 411 of the locking disk 41 opposite to it under the action of the elastic member 311, and the machine head 31 and the support seat 21 are automatically locked at a specific angle; when the locking switch 46 is pressed to the third position, the locking block 42 moves to the clamping locking disk position, and the machine head 31 and the support seat 21 are locked as a whole through the locking block 42 and the locking disk 41.

[0032] The present invention can realize the automatic locking of the machine head 31 and the support seat 21 at a specific angle (common working angle) and the locking of the machine head 31 and the support seat 21 at any position by operating the same locking switch 46. The functions are more diverse, the operation is more convenient, the locking accuracy is high, and the locking effect is good. In specific use, when the user needs to swing the machine head 31 of the cutting device 30 to any position (including a certain position of a specific angle and a non-specific angle), it is only necessary to press the locking switch 46 to the first position first. At this time, the machine head 31 is in an unlocked state. The user can swing it to the desired position, and then press the locking switch 46 to the third position. At this time, the locking block 42 clamps the locking disk 41, so that the machine head 31 and the support seat 21 are locked as a whole; when the user needs to When the head 31 of the device 30 swings to a certain specific position, it is only necessary to press the locking switch 46 to the first position first. At this time, the head 31 of the cutting device 30 is in an unlocked state. After releasing the locking switch 46 pressed to the first position, the operator swings the head 31 to near the required specific angle. When the head 31 swings slightly to a certain angle until it is facing the specific angle, the locking pin 43 will be automatically inserted into the locking hole 411 facing it at this time under the action of the elastic member 311, thereby realizing the automatic locking function at a specific angle. In order to enhance the operating stability of the cutting device 30, the user can turn the locking switch 46 to the third position after the locking pin 43 is automatically locked, and lock it through the locking block 42 and the locking disk 41, which provides a strong guarantee for the stable operation of the machine.

[0033] The transmission mechanism 44 includes a rotating shaft 441, a first bevel gear 442, a second bevel gear 443, and a screw 444. The rotating shaft 441 is rotatably arranged in the machine head 31. In the present invention, the rotating shaft 441 is arranged in the left-right direction, the locking switch 46 is fixedly connected to the end of the rotating shaft 441, the first bevel gear 442 is fixedly connected to the rotating shaft 441, and the screw 444 is rotatably arranged in the machine head 31 in the front-back direction and one end thereof passes through the locking plate 41. The locking plate 41 An arc-shaped avoidance groove 412 is provided for the screw rod 444 to swing left and right. The second bevel gear 443 is fixedly connected to the screw rod 444 and meshes with the first bevel gear 442 for transmission. The front end of the screw rod 444 is threadedly connected to the locking block 42. The locking block 42 is matched with the support seat 21 to prevent rotation. When the locking switch 46 swings, it will drive the screw rod 444 to drive the locking block 42 to move between the clamping locking disk position and the loosening locking disk position, thereby realizing the locking and unlocking of the machine head 31 and the support seat 21.

[0034] When the locking switch 46 is pressed to the first position, the rotating shaft 441 drives the screw 444 to rotate forward through the first bevel gear 442 and the second bevel gear 443, and the screw 444 will drive the locking block 42 to move forward until the locking block 42 moves to the released locking disk position, at which time the locking block 42 is separated from the locking disk 41, thereby unlocking the machine head 31 and the support seat 21; when the locking switch 46 is pressed to the third position, the rotating shaft 441 drives the screw 444 to rotate in the opposite direction through the first bevel gear 442 and the second bevel gear 443, and the screw 444 will drive the locking block 42 to move backward until the locking block 42 moves to the clamped locking disk position, at which time the locking block 42 is locked with the locking disk 41, thereby locking the machine head 31 and the support seat 21 as one.

[0035] The support seat 21 is provided with a limiting protrusion 211, and a movable space 212 for the locking block 42 to move forward and backward is formed between the limiting protrusion 211 and the locking plate 41. The locking block 42 is limited by the limiting protrusion 211 to prevent the locking block 42 from being separated from the screw rod 444. The movable space 212 is provided with a limiting anti-rotation surface, and the lower end of the locking block 42 abuts against the limiting anti-rotation surface, and the locking block 42 can be limited to rotate by the limiting anti-rotation surface.

[0036] The linkage mechanism 45 includes a linkage member 451 movably mounted on the rotating shaft 441, a first linkage pin 452 fixedly connected to the rotating shaft 441, and a second linkage pin 453 fixedly connected to the rear end of the locking pin 43. The first end of the linkage member 451 is provided with a toggle portion 4511 corresponding to the position of the first linkage pin 452, and the second end of the linkage member 451 is maintained in a state of conflict with the second linkage pin 453. Specifically, the clearance fit between the linkage member 451 and the rotating shaft 441 makes it possible for the linkage member 451 to not rotate synchronously when the rotating shaft 441 rotates. Only when the rotating shaft 441 drives the first linkage pin 452 to rotate, the linkage member 451 is driven to rotate through the first linkage pin 452. The second linkage pin 453 is laterally arranged in the left and right directions. The second linkage pin 453 is abutted against the rear side of the second end of the linkage member 451. The linkage member 451 has a tendency to rotate forward under the abutment of the second linkage pin 453. When the locking switch 46 is switched to the first position, the first locking pin 43 can drive the toggle portion 4511 and the linkage member 451 to rotate backward, thereby driving the locking pin 43 to move to a position out of the locking hole through the second linkage pin 453.

[0037] When the locking switch 46 is rotated from the second position to the first position, the first linkage pin 452 can drive the toggle portion 4511 to rotate downward, so that the linkage member 451 drives the second linkage pin 453 to move away from the locking disk 41 until the locking pin 43 is completely disengaged from the locking hole 411; when the locking switch 46 pressed to the first position is released, the locking pin 43 moves toward the direction of the insertion locking hole 411 under the elastic force of the elastic member 311, so that the second linkage pin 453 drives the linkage member 451 to reset. At this time, the toggle portion 4511 of the linkage member 451 drives the first linkage member 451 to reset, thereby resetting the rotating shaft 441 and the locking switch 46 to the second position. That is to say, no matter which position the locking switch 46 is in, the second linkage pin 453 is against the linkage member 451. When the locking switch 46 is in the third position, the first linkage pin 452 is not in contact with the toggle portion 4511. When the locking switch 46 is in the second position, the first linkage pin 452 is not in contact with the toggle portion 4511 or is just in contact with the toggle portion 4511. At this time, the locking pin 43 is in a state of being inserted into the locking hole 411. When the locking switch 46 is switched from the second position to the first position, the first linkage pin 452 will drive the toggle rod to rotate downward, so that the linkage member 451 and the second linkage pin 453 cooperate to overcome the elastic force of the elastic member 311 to completely pull the locking pin 43 out of the locking hole 411. Since the locking pin 43 is disengaged from the locking hole 411, the cutting device 30 is in an unlocked state at this time.

[0038] A step portion is provided in the accommodating cavity, and an abutment ring is provided on the locking pin 43. The elastic member 311 is sleeved on the locking pin 43, and one end of the elastic member 311 abuts against the step portion, and the other end of the elastic member 311 abuts against the abutment ring. Through this arrangement, the locking pin 43 always has a tendency to move in the direction of being inserted into the locking hole 411 under the action of the elastic member 311.

[0039] The two ends of the machine head 31 are respectively fixedly connected with a locking switch 46 that cooperates with the transmission mechanism 44. Specifically, the two ends of the corresponding rotating shaft 441 of the machine head 31 are respectively fixedly connected with a locking switch 46. Through this setting, the user can swing one of the locking switches 46 to lock and unlock the machine head 31, which is convenient for the operator to use flexibly.

[0040] The locking plate 41 has a locking position extending upward from the support seat 21 , and a plurality of locking holes 411 are distributed at intervals along an arc track at the locking position of the locking plate 41 .

[0041] The upper end of the support seat 21 is fixedly connected with a dial 213. In the present invention, the dial 213 is a shell-like structure, which is arranged at the upper end of the support seat 21, and is used to cover the locking disk and the locking position, the locking pin 43, the locking block 42, etc. The machine head 31 is provided with a pointer 312 used in conjunction with the dial 213. The dial 213 can help the operator intuitively observe the left and right swing angle of the machine head 31 relative to the support seat 21, that is, the left and right swing angle of the cutting device 30 relative to the workbench 20.

[0042] In summary, the present invention has the following beneficial effects: the present invention can adjust the machine head 31 to a specific angle (common working angle) and any angle using the same locking switch 46, with more diverse functions, convenient and quick operation, and good locking effect.

[0043] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A cutting tool head angle adjustment mechanism, comprising a support base (21) arranged at the rear end of a workbench (20), a head (31) swingably connected to the support base (21), and a locking plate (41) arranged between the head (31) and the support base (21), wherein the locking plate (41) is fixedly connected to the support base (21), characterized in that: The machine head (31) further comprises a locking block (42), a locking pin (43), a transmission mechanism (44), a linkage mechanism (45) and a locking switch (46); the locking plate (41) is provided with a plurality of locking holes (411) arranged at intervals and having a specific angle; the locking holes (411) are arranged on the swinging track of the locking pin (43); a receiving hole for the locking pin (43) to be able to extend and retract forward and backward is provided in the machine head (31); an elastic member (311) is provided in the receiving hole for driving the locking pin (43) to move in a direction of being inserted into the locking hole (411); a rear end of the locking pin (43) is linked to the transmission mechanism (44) through a linkage mechanism (45); The locking switch (46) is connected to the locking block (42) through the transmission mechanism (44). When the locking switch (46) swings back and forth, the locking block (42) is driven by the transmission mechanism (44) to move back and forth between the clamping locking disk position and the loosening locking disk position, thereby realizing the locking and unlocking of the machine head (31) and the support seat (21) at any angle. The locking pin (43) can move back and forth between the insertion position of the locking hole and the separation position of the locking hole through the linkage mechanism (45) and the elastic member (311), thereby realizing the automatic locking and unlocking of the machine head (31) and the support seat (21) at a specific angle.

2. The cutting tool head angle adjustment mechanism according to claim 1, characterized in that: The locking switch (46) can be switched among a first position, a second position and a third position, wherein the second position is between the first position and the third position. When the locking switch (46) is pressed to the first position, the machine head (31) and the support seat (21) are in an unlocked state, and the machine head (31) can swing at any angle relative to the support seat (21). After releasing the locking switch (46) pressed to the first position, when the operator swings the machine head (31) to a desired specific angle, the locking pin (43) can be automatically inserted into the locking hole (411) of the locking disk (41) directly opposite to it under the action of the elastic member (311), and the machine head (31) and the support seat (21) are automatically locked at a specific angle. When the locking switch (46) is pressed to the third position, the locking block (42) moves to the position of clamping the locking disk, and the machine head (31) and the support seat (21) are locked as a whole through the locking cooperation of the locking block (42) and the locking disk (41).

3. The cutting tool head angle adjustment mechanism according to claim 2, characterized in that: The transmission mechanism (44) comprises a rotating shaft (441), a first bevel gear (442), a second bevel gear (443), and a screw (444); the rotating shaft (441) is rotatably arranged in the machine head (31); a locking switch (46) is fixedly connected to the end of the rotating shaft (441); the first bevel gear (442) is fixedly connected to the rotating shaft (441); the screw (444) is arranged in the front-rear direction and passes through the locking plate (41); the locking plate (41) is provided with an arc for the screw (444) to swing left and right The second bevel gear (443) is fixedly connected to the screw rod (444) and meshes with the first bevel gear (442) for transmission. The front end of the screw rod (444) is threadedly connected to the locking block (42). The locking block (42) and the support seat (21) are anti-rotationally matched. When the locking switch (46) swings, it drives the screw rod (444) to drive the locking block (42) to move between a clamping locking disk position and a loosening locking disk position, thereby realizing locking and unlocking of the machine head (31) and the support seat (21).

4. The cutting tool head angle adjustment mechanism according to claim 2, characterized in that: The support seat (21) is provided with a limiting protrusion (211), and a movable space (212) for the locking block (42) to move forward and backward is formed between the limiting protrusion (211) and the locking plate (41). The locking block (42) is limited by the limiting protrusion (211) to prevent the locking block (42) from being separated from the screw rod (444).

5. The cutting tool head angle adjustment mechanism according to claim 2, characterized in that: The linkage mechanism (45) comprises a linkage member (451) movably sleeved on the rotating shaft (441), a first linkage pin (452) fixedly connected to the rotating shaft (441), and a second linkage pin (453) fixedly connected to the rear end of the locking pin (43); a first end of the linkage member (451) is provided with a toggle portion (4511) corresponding to the position of the first linkage pin (452); and a second end of the linkage member (451) is maintained in a state of being in conflict with the second linkage pin (453).

6. The cutting tool head angle adjustment mechanism according to claim 5, characterized in that: The second linkage pin (453) is arranged transversely in the left-right direction, and the second linkage pin (453) is abutted against the rear side of the second end of the linkage member (451). The linkage member (451) has a tendency to rotate forward under the abutment of the second linkage pin (453). When the locking switch (46) is switched to the first position, the first locking pin (43) can drive the toggle portion (4511) and the linkage member (451) to rotate backward, thereby driving the locking pin (43) to move to a position disengaged from the locking hole.

7. The cutting tool head angle adjustment mechanism according to claim 6, characterized in that: When the locking switch (46) is rotated from the second position to the first position, the first linkage pin (452) can drive the toggle portion (4511) to rotate downward, so that the linkage member (451) drives the second linkage pin (453) to move away from the locking disk (41) until the locking pin (43) is completely separated from the locking hole (411); when the locking switch (46) pressed to the first position is released, the locking pin (43) moves in the direction of inserting into the locking hole (411) under the elastic force of the elastic member (311), so that the second linkage pin (453) drives the linkage member (451) to reset, and at this time, the toggle portion (4511) of the linkage member (451) drives the first linkage member (451) to reset, so that the rotating shaft (441) and the locking switch (46) are reset to the second position.

8. A cutting tool head angle adjustment mechanism according to any one of claims 1 to 7, characterized in that: Both ends of the machine head (31) are respectively fixedly connected with locking switches (46) that cooperate with the transmission mechanism (44).

9. A cutting tool head angle adjustment mechanism according to any one of claims 1 to 7, characterized in that: The locking disk (41) has a locking position extending upward from the support seat (21), and a plurality of locking holes (411) are distributed at intervals along an arc track at the locking position of the locking disk (41).

10. A cutting tool head angle adjustment mechanism according to any one of claims 1 to 7, characterized in that: The upper end of the support seat (21) is fixedly connected with a dial (213), and the machine head (31) is provided with a pointer (312) used in conjunction with the dial (213).

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