A milling cutter tooling mechanism with adjustable drilling radius

Abstract

The present invention relates to a milling cutter tooling mechanism with adjustable drilling radius, comprising a motor, an output shaft is provided at the center position of the lower end of the motor, the lower end of the output shaft is fixedly connected to a circular groove block, a groove cavity is opened at the center position of the lower end of the circular groove block, an adjusting block is provided in the groove cavity, threads on the left and right sides of the adjusting block penetrate through the connecting adjusting rod, and the lower end of the adjusting block is slidably connected to a limit block, a milling cutter head is provided at the center position of the lower end of the limit block, and a milling block is provided at the lower end of the milling cutter head, the adjusting block is wrapped and limited by setting the circular groove block, and then the limit block at the lower end of the adjusting block is connected and fixed to the milling cutter head, the radius of the entire milling cutter is adjusted by adjusting the distance between the limit block and the motor output shaft, and then the limit adjustment groove is used to adjust the extension length of the milling cutter, thereby ensuring high overall stability, low structural cost, convenient use, strong practicality and high structural precision.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutter tooling, and in particular to a milling cutter tooling mechanism with adjustable drilling radius. Background Art

[0002] The tool commonly used for milling is called a milling cutter. A milling cutter is a rotating tool with one or more teeth. When working, each tooth cuts off the excess of the workpiece intermittently in turn. The milling cutter is mainly used to process planes, steps, grooves, formed surfaces and cut off workpieces on a milling machine. There are at least the following disadvantages in the existing face milling cutters: 1. Due to the limitation of the processing radius, traditional face milling cutters are prone to low processing accuracy and a small range of application; 2. If the tool needs to be replaced during the adjustment process, the milling depth and radius as well as the inconsistency of the initial working state of each tool are likely to cause an uneven milling surface and a low pass rate.

[0003] Patent No. CN03262470.0 discloses an adjustable center disc milling cutter, which uses indexable blades to form the cutting edge of the center disc milling cutter, and has a cutter pit and a cutting groove processed on the cutter body, and the blade is fastened to the cutter pit with screws. The cutting profile of the cutting edge of the cutter body, that is, the generatrix of the cutting edge, is: a straight line that is in the same plane as the axis of the cutter body and is not parallel to the axis of the cutter body has an arc at each end that is tangent to the straight line, the center of the arc at the end close to the axis of the cutter body is between the axis of the cutter body and the straight line, and the center of the arc at the end far from the axis of the cutter body is outside the straight line, and this arc can move along the straight line, and a movable cutter seat that can move up and down is used, and the distance between the upper arc cutting edge and the lower arc cutting edge on the milling cutter is changed by moving the movable cutter seat up and down, so as to adapt to the processing of center discs of different depths or heights. This has changed the disadvantage that the current center disc milling cutter can only process prototype center discs. However, the milling cutter has the following problems: first, changing the diameter of the cutter head position can easily lead to reduced accuracy due to the grinding process, and the diameter change is not thorough. Secondly, the stability of the depth change is not high, and it is easy to cause resonance fracture. Summary of the invention

[0004] The purpose of the present invention is to address the shortcomings of the prior art. A circular groove block is set to wrap and limit the adjustment block, and then the limit block at the lower end of the adjustment block is used to connect and fix the milling cutter head. The distance between the limit block and the motor output shaft is adjusted to adjust the milling radius of the entire milling cutter. The limit adjustment groove is then used to solve the technical problems in the prior art of poor stability after adjusting the milling cutter depth, low structural accuracy, and easy resonance during the milling process, resulting in a short milling cutter life.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A milling cutter tooling mechanism with adjustable drilling radius comprises a motor, an output shaft is provided at the center position of the lower end of the motor, the lower end of the output shaft is fixedly connected to a circular groove block, a groove cavity is opened inside the center position of the lower end of the circular groove block, an adjustment block is provided in the groove cavity, the left and right sides of the adjustment block are threadedly penetrated and connected to an adjustment rod, and the lower end of the adjustment block is slidably connected to a limit block, a milling cutter head is provided at the center position of the lower end of the limit block, and a milling block is provided at the lower end of the milling cutter head.

[0007] Preferably, the circular groove block is wrapped with a protective annular block on the outside, and fastening holes are opened at the front and rear ends of the protective annular block. Fastening screws are arranged in the fastening holes, and the fastening screws penetrate through threads to connect the circular groove block and the protective annular block.

[0008] As a preference, the adjustment block is of a rectangular structure, and three identical recessed notches are provided on the front and rear surfaces of the adjustment block, the width of the recessed notches is the same as the diameter of the fastening screw, and the fastening screw fits neatly into the recessed notches.

[0009] Preferably, a fixing cap is provided at one end of the adjusting rod, and a thread is provided on the surface of the adjusting rod. The adjusting rod passes through the movable connection protection annular block and the circular groove block, and the right end of the adjusting rod is threadedly connected to the adjusting fastening nut.

[0010] As a preferred embodiment, three limit adjustment grooves are provided on the upper end surface of the limit block, the depth of the limit adjustment grooves increases successively from left to right, and the size of each limit adjustment groove is the same as the size of the adjustment block, a cavity is opened at the center position of the limit adjustment groove, a solid block is provided in the cavity, the upper end of the solid block is fixedly connected to the adjustment block, and the lower end of the solid block is slidably connected to the abutment plate.

[0011] As a preferred embodiment, the limit block includes a trapezoidal block, the lower end of the trapezoidal block is fixedly connected to the cylindrical block, and the surface of the trapezoidal block is provided with a limit adjustment groove, and an abutment plate is provided inside the cylindrical block, the front and rear end surfaces of the abutment plate are provided with shock-absorbing springs, and a sliding groove is provided at the center position of the upper end of the abutment plate, the sliding groove is slidably connected to a solid block, the lower end of the abutment plate abuts against the milling cutter body, and the lower end of the milling cutter body is provided with a milling cutter head.

[0012] As a preference, the trapezoidal block is just inserted into the groove cavity, and a beveled rubber block is provided on the rear side of the trapezoidal block, connecting holes are provided on the left and right sides of the beveled rubber block, and connecting rods are provided on the left and right sides of the beveled rubber block, and the connecting rods pass through the circular groove block.

[0013] As a preference, the outer side of the adjusting block is wrapped with a circular groove block, and a trapezoidal block is provided at the lower end of the adjusting block, and the trapezoidal block is arranged at the lower end of the protective annular block.

[0014] As a preferred embodiment, the upper and lower ends of the right side of the cylindrical block are provided with tightening screws, the tightening screws penetrate the threaded connection cylindrical block, and the left side of the tightening screw abuts the milling cutter body, and a rubber pad is provided at the contact position between the tightening screw and the milling cutter body.

[0015] As another preferred embodiment, a fixed depth groove is provided at the front and rear ends of the center position of the lower end of the adjustment block, and the lower end of the adjustment block is slidably connected to the limit adjustment groove, and a depth limit rod is provided at the front and rear ends of the center position of each slot of the limit adjustment groove, and the depth limit rod is just adapted to fit into the fixed depth groove.

[0016] Beneficial effects of the present invention:

[0017] (1) In the present invention, a motor and an output shaft are arranged, and a circular groove block is fixedly connected with the output shaft, and an adjustment block with adjustable position is arranged in the circular groove block. In this way, the farther the adjustment block is from the center line of the output shaft, the larger the milling radius is, thereby realizing the adjustment of the milling cutter radius without changing the structure of the milling cutter. Changing the structure of the milling cutter head not only increases the cost for the manufacture of the milling cutter, but also has poor practicality. Therefore, directly changing the distance between the milling cutter and the output shaft is not only universally adaptable to milling cutters of different models, but also has low cost and better stability.

[0018] (2) In the present invention, an adjustment block is provided, and a limit block is movably connected to the lower end of the adjustment block. The trapezoidal block at the upper end of the limit block is engaged with the lower end of the circular groove block. The depth of the adjustment block is adjusted in the limit adjustment groove. After adjustment, the fastening screw is used to embed it into the recessed groove to prevent the depth of the milling cutter from changing when the radius of the milling cutter is adjusted. Then, the adjustment rod is threadedly connected to the thread at the center position of the adjustment block. The adjustment rod is continuously rotated to make the adjustment block move back and forth on the adjustment rod. In this way, the position of the adjustment block from the motor output shaft is continuously changed, thereby realizing the change of the radius of the milling cutter. After the radius is adjusted, the adjustment fastening nut is used to limit the adjusted radius, so that the depth and radius of the milling cutter can be adjusted with high precision and a wide range of application.

[0019] (3) In the present invention, the milling cutter head is manually controlled to rise so that the depth limit rod leaves the fixed depth groove, and then the extended length of the milling cutter is adjusted, and the fixed depth groove is re-inserted into the depth limit rod at the length position, and the fastening screw is used to insert it into the limit adjustment groove. The adjustment block and the limit block are in a state of interlocking connection, and the adjustment rod is rotated to make the adjustment block move left and right on the adjustment rod, so that the milling cutter head is away from the center line of the motor output shaft, and the milling radius of the milling cutter is adjusted. It is suitable for milling cutters of various specifications, and has high precision and good stability. The milling cutter body structure does not need to be changed, the production cost is low, the application range is wide, and the practicability is strong.

[0020] In summary, the device has the advantages of being able to adjust the extension length of the milling cutter, thereby adjusting the milling depth, and adjusting the milling cutter radius without changing the milling cutter structure. It is suitable for milling cutters of various specifications, has a wide range of applications, and has high adjustment accuracy. It is especially suitable for the field of milling cutter tooling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the groove cavity in the present invention.

[0024] Figure 3 It is a structural schematic diagram of the adjusting rod in the present invention.

[0025] Figure 4 It is a schematic structural diagram of the abutment plate and the milling cutter body in the present invention.

[0026] Figure 5 It is a schematic structural diagram of the bevel-cut rubber block in the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the depth limiting rod in the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0029] Embodiment 1

[0030] like Figures 1 to 6 As shown, the present invention provides a milling cutter tooling mechanism with adjustable drilling radius, comprising a motor 1, an output shaft 11 is provided at the center position of the lower end of the motor 1, the lower end of the output shaft 11 is fixedly connected to a circular groove block 2, a groove cavity 21 is opened inside the center position of the lower end of the circular groove block 2, an adjustment block 3 is provided in the groove cavity 21, the left and right sides of the adjustment block 3 are threadedly penetrated by an adjustment rod 31, and the lower end of the adjustment block 3 is slidably connected to a limit block 4, a milling cutter head 5 is provided at the center position of the lower end of the limit block 4, and a milling block 6 is provided at the lower end of the milling cutter head 5.

[0031] Further, the outer side of the circular groove block 2 is wrapped with a protective annular block 22, and the front and rear ends of the protective annular block 22 are both provided with fastening holes 23, and the fastening holes 23 are provided with fastening screws 24, and the fastening screws 24 penetrate through the threaded connection of the circular groove block 2 and the protective annular block 22, and the protective annular block 22 wraps the outer side of the circular groove block 2, ensuring that the adjustment block 3 can be stably placed inside the circular groove block 2, preventing the adjustment block 3 from detaching, ensuring the safe use of the entire structure, and reducing the failure rate;

[0032] The setting of the fastening screw 24 can not only limit the position of the adjusting block 3, but also limit the height of the adjusting block 3, and has diverse functions, simple structure, simple distance and low cost.

[0033] Furthermore, the adjustment block 3 is a rectangular structure, and three identical recessed notches 32 are provided on the front and rear surfaces of the adjustment block 3. The width of the recessed notch 32 is the same as the diameter of the fastening screw 24, and the fastening screw 24 is just inserted into the recessed notch 32. The adjustment block 3 can be adjusted up and down in the circular groove block 2. The depth of the groove cavity 21 is greater than the height of the adjustment block 3. The fastening screw 24 is inserted into the fastening hole 23, and the height of the adjustment block 3 can be limited.

[0034] Furthermore, a fixing cap 311 is provided at one end of the adjusting rod 31, and a thread is provided on the surface of the adjusting rod 31. The adjusting rod 31 passes through the movable connection protection annular block 22 and the circular groove block 2, and the right end of the adjusting rod 31 is threadedly connected to the adjusting fastening nut 312. The fixing cap 311 on the adjusting rod 31 is used to limit the adjusting rod 31 to prevent it from passing through one end of the adjusting block 3, and it is convenient for workers to take and rotate it. The adjusting fastening nut 312 is to fix the position of the adjusting rod 31 after adjusting the milling radius, so as to ensure that the milling cutter has higher precision and stronger stability during the milling process.

[0035] Furthermore, three limit adjustment grooves 41 are provided on the upper end surface of the limit block 4, and the depth of the limit adjustment grooves 41 deepens from left to right, and the size of each limit adjustment groove 41 is the same as the size of the adjustment block 3. A cavity 42 is opened at the center of the limit adjustment groove 41, and a solid block 43 is provided in the cavity 42. The upper end of the solid block 43 is fixedly connected to the adjustment block 3, and the lower end of the solid block 43 is slidably connected to the abutment plate 44. The limit adjustment grooves 41 deepen from left to right, and the solid block 43 is driven to slide during the movement of the adjustment block 3, so that the entire milling cutter head 5 is away from the cylindrical block 46, thereby deepening the drilling depth of the milling cutter, with good flexibility, and three levels of adjustable depth, so that unnecessary milling cutter breakage will not occur due to the adjustment depth being too deep.

[0036] Further, the limit block 4 includes a trapezoidal block 45, the lower end of which is fixedly connected to a cylindrical block 46, and a limit adjustment groove 41 is provided on the surface of the trapezoidal block 45, and an abutment plate 44 is provided inside the cylindrical block 46, and a damping spring 47 is provided on the front and rear end surfaces of the abutment plate 44, and a slide groove is provided at the center position of the upper end of the abutment plate 44, and a solid block 43 is slidably connected in the slide groove, and the lower end of the abutment plate 44 abuts against a milling cutter body 51, and a milling cutter head 5 is provided at the lower end of the milling cutter body 51, and the trapezoidal block 45 is movably connected with the lower end of the circular groove block 2, so that the trapezoidal block 45 can slide at the lower end of the circular groove block 2, so as to facilitate the adjustment of the milling cutter radius;

[0037] The abutment plate 44 is arranged in the cylindrical block 46. When the depth needs to be adjusted, the milling cutter body 51 is used to support the abutment plate 44. The abutment plate 44 adjusts the position height of the adjustment block 3 through the solid block 43, thereby realizing the depth adjustment of the milling cutter body 51. In addition, shock-absorbing springs 47 are arranged at the front and rear ends of the abutment plate 44, which can reduce the influence of resonance during the milling process and extend the service life of the milling cutter.

[0038] Furthermore, the trapezoidal block 45 is just inserted into the groove cavity 21, and a beveled rubber block 48 is provided on the rear side of the trapezoidal block 45. Connection holes are provided on the left and right sides of the beveled rubber block 48, and connecting rods 49 are provided on the left and right sides of the beveled rubber block 48. The connecting rods 49 penetrate the circular groove block 2. The beveled rubber block 48 is provided to ensure a higher radius accuracy after the trapezoidal block 45 slides in the groove cavity 21. The beveled rubber block 48 is abutted by the connecting rod 49, so that the friction between the beveled rubber block 48 and the trapezoidal block 45 is greater, and the vibration of the trapezoidal block 45 can be reduced, ensuring that the adjusted radius accuracy is higher.

[0039] Furthermore, the outer side of the adjusting block 3 wraps the circular groove block 2, and a trapezoidal block 45 is provided at the lower end of the adjusting block 3. The trapezoidal block 45 is arranged at the lower end of the protective annular block 22. The trapezoidal block 45 is arranged at the lower end of the protective annular block 22 to facilitate the adjustment of the milling cutter radius. The structure is reasonable and practical.

[0040] Furthermore, the upper and lower ends of the right side of the cylindrical block 46 are provided with tightening screws 461, and the tightening screws 461 penetrate the threaded connection of the cylindrical block 46, and the left side of the tightening screws 461 abuts against the milling cutter body 51. A rubber pad is provided at the contact position between the tightening screws 461 and the milling cutter body 51. The tightening screws 461 are used to tighten the position of the milling cutter body 51 to facilitate the fixation of the milling cutter body 51.

[0041] Furthermore, a fixed depth groove 33 is provided at the front and rear ends of the center position of the lower end of the adjusting block 3, and the lower end of the adjusting block 3 is slidably connected to the limit adjusting groove 41, and a depth limiting rod 411 is provided at the front and rear ends of the center position of each slot of the limit adjusting groove 41, and the depth limiting rod 411 is just adapted to be inserted into the fixed depth groove 33, and the fixed depth groove 33 can be embedded in the depth limiting rod 411, so that after adjusting the extension length of the milling cutter, the adjusting block 3 and the limiting block 4 can be embedded and fixedly connected, so that the extension length of the milling cutter is fixed, and then the milling radius of the entire milling cutter is adjusted by adjusting the distance between the adjusting block 3 and the fixing cap 311, and at this time, when the adjusting block 3 adjusts the position, it will drive the limiting block 4 to adjust the position, thereby realizing the adjustment of the milling radius of the milling cutter, which has a simple principle, low cost and strong practicality.

[0042] Working process: First, the worker inserts the milling cutter body 51 into the cylindrical block 46, and then the upper end of the milling cutter body 51 is connected to the abutment plate 44, and the milling cutter body 51 is manually pushed upward so that the solid block 43 lifts the adjustment block 3, and the fixed depth groove 33 on the adjustment block 3 is away from the depth limit rod 411, and then the adjustment rod 31 is used to thread the adjustment block 3, and the adjustment rod 31 is pulled to move the adjustment block 3 to the limit adjustment groove 41 of the required depth, and then the milling cutter head 5 is pulled so that the fixed depth groove 33 on the adjustment block 3 is inserted into the depth limit rod 411, and then the milling cutter body 51 is fixed in position by the tightening screw 461 to ensure that the depth adjustment of the milling cutter body 51 is stably placed;

[0043] Then, the fastening screw 24 is placed in the fastening hole 23 so that the fastening screw 24 contacts the recessed notch 32. At the beginning, the fastening screw 24 is only inserted into the recessed notch 32, and the adjusting block 3 is not tightened. By rotating the adjusting rod 31, the distance between the fixing cap 311 at one end of the adjusting rod 31 and the adjusting block 3 is adjusted closer or farther. In this way, the adjusting block 3 will drive the limit block 4 to move away from the motor output shaft to achieve the function of adjusting the radius of the milling cutter. After adjusting the depth and radius, the fastening screw 24 is tightened, and then the position of the adjusting rod 31 is tightened by adjusting the fastening nut 312, and the motor 1 starts to work, thereby performing milling of the milling cutter.

[0044] When the milling cutter head 5 is in the process of milling, the resonance generated with the surface of the object will be well released due to the shock-absorbing effect of the shock-absorbing spring 47, thereby reducing the possibility of the milling cutter breaking. The entire structure has high precision, strong practicality, and a wide range of applications. It does not need to change the milling cutter production line, reduces production costs, and is suitable for milling cutters of different specifications.

[0045] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0046] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0047] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A milling cutter tooling mechanism with adjustable drilling radius, characterized in that: include A motor (1), wherein an output shaft (11) is provided at the center of the lower end of the motor (1), the lower end of the output shaft (11) is fixedly connected to a circular groove block (2), a groove cavity (21) is provided inside the center of the lower end of the circular groove block (2), an adjustment block (3) is provided inside the groove cavity (21), the left and right sides of the adjustment block (3) are threadedly connected to an adjustment rod (31), and the lower end of the adjustment block (3) is slidably connected to a limit block (4), and a milling cutter head (5) is provided at the center of the lower end of the limit block (4); The circular groove block (2) is wrapped with a protective annular block (22) on the outside, and the front and rear ends of the protective annular block (22) are provided with fastening holes (23), and the fastening holes (23) are provided with fastening screws (24), and the fastening screws (24) penetrate through the threads to connect the circular groove block (2) and the protective annular block (22); The adjusting block (3) is of a rectangular structure, and three identical recessed notches (32) are provided on the front and rear surfaces of the adjusting block (3), the width of the recessed notches (32) being the same as the diameter of the fastening screw (24), and the fastening screw (24) is just inserted into the recessed notches (32); The upper surface of the limit block (4) is provided with three limit adjustment grooves (41), the depth of the limit adjustment grooves (41) increases from left to right, and the size of each limit adjustment groove (41) is the same as the size of the adjustment block (3), a cavity (42) is opened at the center of the limit adjustment groove (41), a solid block (43) is provided in the cavity (42), the upper end of the solid block (43) is fixedly connected to the adjustment block (3), and the lower end of the solid block (43) is slidably connected to the abutment plate (44).

2. The milling cutter tooling mechanism with adjustable drilling radius according to claim 1, characterized in that: A fixing cap (311) is provided at one end of the adjusting rod (31), and a thread is provided on the surface of the adjusting rod (31). The adjusting rod (31) passes through the movable connection protection annular block (22) and the circular groove block (2), and the right end of the adjusting rod (31) is threadedly connected to the adjusting fastening nut (312).

3. The drilling radius adjustable milling cutter fixture mechanism according to claim 1, characterized in that: The limit block (4) comprises a trapezoidal block (45), the lower end of the trapezoidal block (45) is fixedly connected to the cylindrical block (46), the surface of the trapezoidal block (45) is provided with a limit adjustment groove (41), and the cylindrical block (46) is provided with an abutment plate (44) inside, the front and rear end surfaces of the abutment plate (44) are provided with a damping spring (47), and a slide groove is provided at the center position of the upper end of the abutment plate (44), and the slide groove is slidably connected to the solid block (43), the lower end of the abutment plate (44) abuts against the milling cutter body (51), and the lower end of the milling cutter body (51) is provided with a milling cutter head (5).

4. The drilling radius adjustable milling cutter fixture mechanism according to claim 3, characterized in that: The trapezoidal block (45) is just inserted into the groove cavity (21), and a beveled rubber block (48) is provided at the rear side of the trapezoidal block (45), connecting holes are provided at the left and right sides of the beveled rubber block (48), and connecting rods (49) are provided at the left and right sides of the beveled rubber block (48), and the connecting rods (49) pass through the circular groove block (2).

5. The drilling radius adjustable milling cutter fixture mechanism according to claim 1, characterized in that: The outer side of the adjustment block (3) wraps around the circular groove block (2), and a trapezoidal block (45) is provided at the lower end of the adjustment block (3), and the trapezoidal block (45) is arranged at the lower end of the protective annular block (22).

6. The drilling radius adjustable milling cutter fixture mechanism according to claim 3, characterized in that: The upper and lower ends of the right side of the cylindrical block (46) are provided with tightening screws (461), the tightening screws (461) penetrate through the threaded connection of the cylindrical block (46), and the left side of the tightening screw (461) abuts against the milling cutter body (51), and a rubber pad is provided at the contact position between the tightening screw (461) and the milling cutter body (51).

7. The drilling radius adjustable milling cutter fixture mechanism according to claim 1, characterized in that: A fixed depth groove (33) is provided at the front and rear ends of the center position of the lower end of the adjustment block (3), and the lower end of the adjustment block (3) is slidably connected to the limit adjustment groove (41). A depth limit rod (411) is provided at the front and rear ends of the center position of each notch of the limit adjustment groove (41), and the depth limit rod (411) fits exactly into the fixed depth groove (33).

Images