A modular cutting tool structure

Abstract

The utility model relates to the technical field of cutting tool, especially a combined cutting tool structure, which is provided with two interchangeable cutter head parts, can quickly switch the cutter head part, is simple and easy to operate, and improves work efficiency; including handle, sword body and cutting tool head, still include pivot, upper eccentric wheel, lower eccentric wheel, push rod and push rod, two cutting tool heads are respectively inserted in two cutting tool insertion holes, the pivot rotation is installed in the middle part of the installation chamber of sword body, and the both ends of pivot all stretch out the outside of sword body, the upper eccentric wheel eccentricity is installed on the pivot, the outer wheel surface of upper eccentric wheel is connected with push rod sliding, push rod sliding is installed in the cutting tool insertion hole of being located upper, push rod is connected with a cutting tool head, the lower eccentric wheel eccentricity is installed on the pivot, the outer wheel surface of lower eccentric wheel is connected with push rod sliding, push rod sliding is installed in the cutting tool insertion hole of being located below, push rod is connected with another cutting tool head, and upper eccentric wheel and lower eccentric wheel are arranged left and right oppositely.

Description

Technical Field

[0001] This utility model relates to the technical field of cutting tools, and in particular to a combined cutting tool structure. Background Technology

[0002] Cutting tools are tools used for cutting processes in mechanical manufacturing. To achieve different cutting functions, various combined cutting tools have been disclosed in the prior art. For example, Chinese Utility Model Patent Publication No. CN219966478U proposes a combined cutting tool that includes a tool holder, a cutting head rod at its left end, and a cutting head at the left end of the cutting head rod. An anti-deflection mechanism is provided between the cutting head rod and the tool holder, including an anti-deflection sleeve fixed to the left side of the tool holder rod and located outside the cutting head rod. A fixing plate is fixedly sleeved on the left end of the cutting head rod, and the outer surface of the fixing plate contacts the inner surface of the anti-deflection sleeve. This utility model, by combining the tool holder, the cutting head rod, and the anti-deflection mechanism, can further limit and fix the position of the cutting head rod without affecting the cutting process of the workpiece. It also supports and distributes the torque force on the cutting head rod, preventing deflection and loosening of the cutting head rod that would affect the finishing process of the workpiece, thus increasing the stability of the cutting head and improving machining accuracy.

[0003] However, the aforementioned combined cutting tool can only be equipped with one tool holder, and the tool holder replacement operation is relatively complicated. When the cutting tool head is worn or the cutting function needs to be changed, it is not convenient to quickly replace the tool holder, which affects work efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a combined cutting tool structure with two alternately retractable cutting heads, which can quickly switch cutting heads, is easy to operate, and improves work efficiency.

[0005] This utility model discloses a combined cutting tool structure, including a tool holder, a tool body, and cutting heads. The tool holder is mounted on the rear end of the tool body. It also includes a rotating shaft, an upper eccentric wheel, a lower eccentric wheel, an upper push rod, and a lower push rod. Two cutting heads are provided. The front end face of the tool body has two parallel tool insertion holes, and the rear part of the tool body has a mounting cavity communicating with the two tool insertion holes. The two cutting heads are respectively inserted into the two tool insertion holes. The rotating shaft is rotatably mounted in the middle of the mounting cavity of the tool body, with both ends of the rotating shaft extending beyond the outer side of the tool body. The upper eccentric wheel is eccentrically mounted on... On the rotating shaft, the outer surface of the upper eccentric wheel is slidably connected to the upper push rod, which is slidably installed in the upper tool holder and connected to a cutting head. The lower eccentric wheel is eccentrically installed on the rotating shaft, with its outer surface slidably connected to the lower push rod, which is slidably installed in the lower tool holder and connected to another cutting head. The upper and lower eccentric wheels are arranged opposite each other. The tool holder is used to load the tool post, and carbide cutting heads are installed on the outer ends of the two cutting heads. The rotating shaft drives the upper and lower eccentric wheels. As the eccentric wheels rotate, due to the left-right arrangement of the upper and lower eccentric wheels, when the protrusion of the upper eccentric wheel faces away from the upper push rod, the upper eccentric wheel pulls the upper push rod and a cutting head into the tool holder, causing the alloy cutting head of the cutting head to retract into a tool holder. Simultaneously, the protrusion of the lower eccentric wheel faces the lower push rod, causing the lower eccentric wheel to push the lower push rod and another cutting head out of the tool holder, causing the alloy cutting head of the other cutting head to extend out of another tool holder and beyond the front end face of the tool body. At this time, the other cutting head... The alloy cutting head on the tool head performs cutting work on the workpiece. When it is necessary to switch cutting heads, the shaft is rotated so that the protrusion of the upper eccentric wheel faces the upper push rod, and the protrusion of the lower eccentric wheel faces away from the lower push rod. This causes the cutting head connected to the lower push rod to retract into the tool insertion hole, while the cutting head connected to the upper push rod extends out of the tool insertion hole. At this time, the alloy cutting head on the cutting head connected to the upper push rod extends out of the front end of the tool body to cut the workpiece, realizing rapid switching between the two cutting heads. The operation is simple and helps to improve work efficiency.

[0006] Preferably, it also includes two ball bearings and two slide rail grooves. The two ball bearings are respectively installed on the rear end of the upper push rod and the rear end of the lower push rod. Slide rail grooves are provided on the wheel surfaces of both the upper and lower eccentric wheels. The two ball bearings are slidably installed in the two slide rail grooves respectively. The two ball bearings are slidably connected to the two slide rail grooves respectively. When the upper and lower eccentric wheels rotate, since the upper and lower eccentric wheels are eccentrically installed on the rotating shaft, the upper and lower eccentric wheels can drive the upper push rod and the lower push rod to move back and forth along the two tool insertion holes, thereby improving the connection reliability between the upper push rod and the upper eccentric wheel, and between the lower push rod and the lower eccentric wheel.

[0007] Preferably, the assembly also includes two gear shafts, two springs, and two gear rings. The two gear shafts are slidably inserted into both ends of the rotating shaft. The outer ends of the two springs are connected to the two gear shafts, and the inner ends of the two springs are connected to the blade body. Multiple positioning teeth are arranged on the outer circumference of the two gear shafts. The two gear rings are respectively installed on the outer walls of both sides of the blade body, and are concentrically arranged with the two gear shafts. The multiple positioning teeth of the two gear shafts mesh with the two gear rings. The two gear shafts are connected to both ends of the rotating shaft via a splined transmission. The elastic force of the two springs pushes the two gear shafts outward from the rotating shaft, causing the multiple positioning teeth of the two gear shafts to mesh with the two gear rings. The gear rings engage, thereby locking the relative angle of the shaft, upper eccentric wheel, and lower eccentric wheel, improving the stability of the shaft, upper eccentric wheel, lower eccentric wheel, upper push rod, lower push rod, and two cutting heads. When the shaft, upper eccentric wheel, and lower eccentric wheel need to be rotated, the two gear shafts are pushed inward, causing multiple positioning teeth of the two gear shafts to disengage from the two gear rings. At this time, rotating the shaft, upper eccentric wheel, and lower eccentric wheel switches the two cutting heads. After the two cutting heads are switched, the two gear shafts are released, and the elastic force of the two springs pushes the two gear shafts outward, causing multiple positioning teeth of the two gear shafts to re-engage with the two gear rings.

[0008] Preferably, it also includes two marking points one and two marking points two. Marking point one is installed on the outer end face of both gear shafts, and two marking points two are arranged opposite each other on the outer wall of the blade. The two marking points two are aligned with the two marking points one respectively. The two marking points one and two marking points two work together to indicate the position of the rotating shaft, thereby improving the accuracy when rotating the shaft.

[0009] Preferably, the assembly also includes slots, blocks, and bolts. Slots are provided at the outer ends of both the upper and lower push rods, and blocks are provided at the inner ends of both cutting heads. The two blocks are respectively inserted into the two slots. Insertion holes are provided on both slots and blocks. Two bolts are used to screw and fasten the upper push rod and the cutting head, and the lower push rod and the cutting head, respectively. The two cutting heads are respectively connected to the two slots through the two blocks, and the two bolts are used to screw and fasten the two cutting heads to the upper and lower push rods, thereby improving the reliability of the connection.

[0010] Preferably, it also includes two clearance holes, with clearance holes provided on both sides of the cutter body, and the clearance holes are aligned with the bolts; when it is necessary to disassemble the cutting head, the shaft is rotated, the shaft drives the upper eccentric wheel and the lower eccentric wheel to rotate, and drives the upper push rod and the lower push rod to move along the two tool insertion holes of the cutter body. When the bolt is aligned with the clearance hole, the shaft is stopped from rotating, and the bolt is removed through the clearance hole, thereby removing the cutting head. After replacing the new cutting head, the new cutting head is screwed and fastened to the upper push rod or the lower push rod through the clearance hole, which is convenient for operation.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The tool holder is used to load onto the tool holder, and the outer ends of the two cutting heads are equipped with alloy cutting heads. The upper and lower eccentric wheels are driven to rotate by the rotating shaft. Since the upper and lower eccentric wheels are arranged opposite each other, when the protrusion of the upper eccentric wheel faces away from the upper push rod, the upper eccentric wheel pulls the upper push rod and one cutting head into the tool insertion hole, so that the alloy cutting head of the cutting head retracts into one tool insertion hole; at the same time, the protrusion of the lower eccentric wheel faces the lower push rod, so that the lower eccentric wheel pushes the lower push rod and another cutting head out of the tool insertion hole, so that the alloy cutting head of the other cutting head retracts into one tool insertion hole. The alloy cutting head extends out of another tool holder and out of the front end of the tool body. At this time, the alloy cutting head on the other cutting head performs cutting work on the workpiece. When it is necessary to switch cutting heads, rotate the shaft so that the protrusion of the upper eccentric wheel faces the upper push rod, and the protrusion of the lower eccentric wheel faces away from the lower push rod. This causes the cutting head connected to the lower push rod to retract into the tool holder, while the cutting head connected to the upper push rod extends out of the tool holder. At this time, the alloy cutting head on the cutting head connected to the upper push rod extends out of the front end of the tool body to cut the workpiece. This allows for quick switching between the two cutting heads, is easy to operate, and helps improve work efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a front sectional view of the present invention;

[0014] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention;

[0015] Figure 4 It is a structural diagram of the cutting head, rotating shaft, upper eccentric wheel, lower eccentric wheel, upper push rod and lower push rod, etc.

[0016] Figure 5 It is a structural diagram of the shaft, upper eccentric wheel, lower eccentric wheel, gear shaft, spring and gear ring, etc.

[0017] Figure 6 It is a structural diagram of the cutting head, upper push rod, ball bearings, groove, locking block, and bolts.

[0018] The following are labels in the attached diagram: 1. Tool holder; 2. Tool body; 3. Cutting head; 4. Rotary shaft; 5. Upper eccentric wheel; 6. Lower eccentric wheel; 7. Upper push rod; 8. Lower push rod; 9. Ball bearing; 10. Slide rail groove; 11. Gear shaft; 12. Spring; 13. Gear ring; 14. Marker point one; 15. Marker point two; 16. Slot; 17. Locking block; 18. Bolt; 19. Clearance hole. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] like Figures 1 to 5 As shown, a combined cutting tool structure includes a tool holder 1, a tool body 2, and cutting heads 3. The tool holder 1 is mounted on the rear end of the tool body 2. It also includes a rotating shaft 4, an upper eccentric wheel 5, a lower eccentric wheel 6, an upper push rod 7, and a lower push rod 8. Two cutting heads 3 are provided. The front end face of the tool body 2 has two parallel tool insertion holes, and the rear part of the tool body 2 has a mounting cavity communicating with the two tool insertion holes. The two cutting heads 3 are respectively inserted into the two tool insertion holes. The rotating shaft 4 is rotatably mounted in the middle of the mounting cavity of the tool body 2, with both ends of the rotating shaft 4 extending outwards from the outside of the tool body 2. The upper eccentric wheel 5 is eccentrically mounted on the rotating shaft 4, and the outer surface of the upper eccentric wheel 5 is slidably connected to the upper push rod 7. The upper push rod 7 is slidably installed in the upper tool insertion hole and is connected to a cutting head 3. The lower eccentric wheel 6 is eccentrically installed on the rotating shaft 4 and its outer wheel surface is slidably connected to the lower push rod 8. The lower push rod 8 is slidably installed in the lower tool insertion hole and is connected to another cutting head 3. The upper eccentric wheel 5 and the lower eccentric wheel 6 are arranged opposite each other. The device also includes two ball bearings 9 and two slide rail grooves 10. The two ball bearings 9 are respectively installed on the rear end of the upper push rod 7 and the rear end of the lower push rod 8. Slide rail grooves 10 are provided on the wheel surfaces of the upper eccentric wheel 5 and the lower eccentric wheel 6. The two ball bearings 9 are slidably installed in the two slide rail grooves 10 respectively.

[0021] Two ball bearings 9 are slidably connected to two slide rail grooves 10 respectively. As the upper eccentric wheel 5 and lower eccentric wheel 6 rotate, and since both are eccentrically mounted on the rotating shaft 4, they can drive the upper push rod 7 and lower push rod 8 to move back and forth along the two tool insertion holes, improving the reliability of the connection between the upper push rod 7 and the upper eccentric wheel 5, and the lower push rod 8 and the lower eccentric wheel 6. The tool holder 1 is used to load onto the tool post. Alloy cutting heads are mounted on the outer ends of the two cutting heads 3, and the upper eccentric wheel 5 and lower eccentric wheel 6 rotate via the rotating shaft 4. Since the upper eccentric wheel 5 and lower eccentric wheel 6 are arranged opposite each other, when the protrusion of the upper eccentric wheel 5 faces away from the upper push rod 7, the upper eccentric wheel 5 pulls the upper push rod 7 and one cutting head 3 into the tool insertion hole, causing the alloy cutting head of the cutting head 3 to retract into one tool insertion hole; simultaneously, the lower... The protrusion of the eccentric wheel 6 faces the lower push rod 8, causing the lower eccentric wheel 6 to push the lower push rod 8 and another cutting head 3 out of the tool insertion hole. This causes the alloy cutting head of the other cutting head 3 to extend out of the other tool insertion hole and out of the front end face of the tool body 2. At this time, the alloy cutting head on the other cutting head 3 performs cutting work on the workpiece. When it is necessary to switch the cutting head 3, the rotating shaft 4 is rotated so that the protrusion of the upper eccentric wheel 5 faces the upper push rod 7, and the protrusion of the lower eccentric wheel 6 faces away from the lower push rod 8. This causes the cutting head 3 connected to the lower push rod 8 to retract into the tool insertion hole, while the cutting head 3 connected to the upper push rod 7 extends out of the tool insertion hole. At this time, the alloy cutting head on the cutting head 3 connected to the upper push rod 7 extends out of the front end of the tool body 2 to cut the workpiece. This achieves rapid switching between the two cutting heads 3, which is simple to operate and helps to improve work efficiency. Example 2

[0022] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, based on Embodiment 1, it also includes two gear shafts 11, two springs 12, and two gear rings 13. The two gear shafts 11 are slidably inserted into both ends of the rotating shaft 4. The outer ends of the two springs 12 are connected to the two gear shafts 11, and the inner ends of the two springs 12 are connected to the blade body 2. Multiple positioning teeth are provided on the outer circumference of the two gear shafts 11. The two gear rings 13 are respectively installed on the outer walls of both sides of the blade body 2. The two gear rings 13 are concentrically arranged with the two gear shafts 11. The multiple positioning teeth of the two gear shafts 11 mesh with the two gear rings 13. It also includes two marking points 14 and two marking points 15. Marking point 14 is installed on the outer end face of both gear shafts 11. Two marking points 15 are arranged opposite each other on the outer wall of the blade body 2. The two marking points 15 are aligned with the two marking points 14.

[0023] The two gear shafts 11 and the two ends of the rotating shaft 4 are connected by a splined transmission. The elastic force of the two springs 12 pushes the two gear shafts 11 outwards from the rotating shaft 4, so that multiple positioning teeth of the two gear shafts 11 mesh with the two gear rings 13 respectively, thereby locking the relative angle of the rotating shaft 4, the upper eccentric wheel 5 and the lower eccentric wheel 6, improving the stability of the rotating shaft 4, the upper eccentric wheel 5, the lower eccentric wheel 6, the upper push rod 7, the lower push rod 8 and the two cutting heads 3. When it is necessary to rotate the rotating shaft 4, the upper eccentric wheel 5 and the lower eccentric wheel 6, the two gear shafts 11 are pushed inwards. This causes multiple positioning teeth of the two gear shafts 11 to disengage from the two gear rings 13. At this time, rotating the shaft 4, the upper eccentric wheel 5, and the lower eccentric wheel 6 switches the two cutting heads 3. After the two cutting heads 3 are switched, the two gear shafts 11 are released, and the elastic force of the two springs 12 pushes the two gear shafts 11 outward, so that multiple positioning teeth of the two gear shafts 11 mesh with the two gear rings 13 again. The two marking points 14 and 15 respectively cooperate to indicate the position of the shaft 4, improving the accuracy when rotating the shaft 4. Example 3

[0024] like Figure 3 , Figure 4 and Figure 6 As shown, based on Embodiment 1, it also includes a slot 16, a block 17, and a bolt 18. The outer ends of the upper push rod 7 and the lower push rod 8 are provided with slots 16, and the inner ends of the two cutting heads 3 are provided with blocks 17. The two blocks 17 are respectively inserted into the two slots 16. The two slots 16 and the two blocks 17 are provided with insertion holes. The two bolts 18 respectively screw the upper push rod 7 and the cutting head 3, and the lower push rod 8 and the cutting head 3. It also includes two clearance holes 19. The clearance holes 19 are provided on both sides of the blade body 2. The clearance holes 19 are aligned with the bolts 18.

[0025] Two cutting heads 3 are respectively connected to two slots 16 via two locking blocks 17. Two bolts 18 are used to fasten the two cutting heads 3, the upper push rod 7, and the lower push rod 8, improving the reliability of the connection. When it is necessary to disassemble the cutting head 3, the rotating shaft 4 is rotated. The rotating shaft 4 drives the upper eccentric wheel 5 and the lower eccentric wheel 6 to rotate, which in turn drives the upper push rod 7 and the lower push rod 8 to move along the two tool insertion holes of the tool body 2. When the bolt 18 is aligned with the clearance hole 19, the rotating shaft 4 is stopped, and the bolt 18 is removed through the clearance hole 19, thereby removing the cutting head 3. After replacing the new cutting head 3, the new cutting head 3 is fastened to the upper push rod 7 or the lower push rod 8 through the clearance hole 19 using the bolt 18, which is convenient for operation.

[0026] like Figures 1 to 6As shown, this utility model discloses a combined cutting tool structure. During operation, the upper eccentric wheel 5 and the lower eccentric wheel 6 rotate via the rotating shaft 4. Since the upper eccentric wheel 5 and the lower eccentric wheel 6 are arranged opposite each other, when the protrusion of the upper eccentric wheel 5 faces away from the upper push rod 7, the upper eccentric wheel 5 pulls the upper push rod 7 and a cutting head 3 into the tool insertion hole, causing the alloy cutting head of the cutting head 3 to retract into the tool insertion hole. Simultaneously, the protrusion of the lower eccentric wheel 6 faces the lower push rod 8, causing the lower eccentric wheel 6 to push the lower push rod 8 and another cutting head 3 out of the tool insertion hole, causing the alloy cutting head of the other cutting head 3 to extend out of the other tool insertion hole. The cutting head 3 has a socket and extends out of the front end of the tool body 2. At this time, the alloy cutting head on the other cutting head 3 performs cutting work on the workpiece. When it is necessary to switch the cutting head 3, rotate the shaft 4 so that the protrusion of the upper eccentric wheel 5 faces the upper push rod 7 and the protrusion of the lower eccentric wheel 6 faces away from the lower push rod 8. This causes the cutting head 3 connected to the lower push rod 8 to retract into the tool socket, while the cutting head 3 connected to the upper push rod 7 extends out of the tool socket. At this time, the alloy cutting head on the cutting head 3 connected to the upper push rod 7 extends out of the front end of the tool body 2 to cut the workpiece. This realizes the rapid switching of the two cutting heads 3, which is simple to operate and helps to improve work efficiency.

[0027] The main functions achieved by this utility model are:

[0028] 1. It features two alternating retractable cutter heads, allowing for quick switching between them, simplifying operation and improving work efficiency;

[0029] 2. The stability and reliability of the two cutting heads 3 are improved by using a locking component;

[0030] 3. Easy to replace the cutting head.

[0031] The combined cutting tool structure of this utility model uses common mechanical methods for installation, connection, or setting. Any method that can achieve the desired beneficial effect can be implemented. The tool holder 1, tool body 2, cutting head 3, rotating shaft 4, upper eccentric wheel 5, lower eccentric wheel 6, ball bearing 9, gear shaft 11, spring 12, gear ring 13, and bolt 18 of the combined cutting tool structure of this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0032] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A combined cutting tool structure comprising a shank (1), a body (2) and a cutting head (3), the shank (1) being mounted on the rear end of the body (2); characterized in that, It also includes a rotating shaft (4), an upper eccentric wheel (5), a lower eccentric wheel (6), an upper push rod (7), and a lower push rod (8). Two cutting heads (3) are provided. Two parallel tool insertion holes are provided on the front end face of the tool body (2). The rear part of the tool body (2) is provided with a mounting cavity that communicates with the two tool insertion holes. The two cutting heads (3) are respectively inserted into the two tool insertion holes. The rotating shaft (4) is rotatably installed in the middle of the mounting cavity of the tool body (2). Both ends of the rotating shaft (4) extend out of the outside of the tool body (2). The upper eccentric wheel (5) is eccentrically installed on the rotating shaft. (4) The outer wheel surface of the upper eccentric wheel (5) is slidably connected to the upper push rod (7). The upper push rod (7) is slidably installed in the tool socket located above. The upper push rod (7) is connected to a cutting head (3). The lower eccentric wheel (6) is eccentrically installed on the rotating shaft (4). The outer wheel surface of the lower eccentric wheel (6) is slidably connected to the lower push rod (8). The lower push rod (8) is slidably installed in the tool socket located below. The lower push rod (8) is connected to another cutting head (3). The upper eccentric wheel (5) and the lower eccentric wheel (6) are arranged opposite each other on the left and right.

2. A modular cutting tool structure according to Claim 1, wherein It also includes two ball bearings (9) and two slide rail grooves (10). The two ball bearings (9) are respectively installed on the rear end of the upper push rod (7) and the rear end of the lower push rod (8). Slide rail grooves (10) are provided on the wheel surfaces of the upper eccentric wheel (5) and the lower eccentric wheel (6). The two ball bearings (9) are respectively slidably installed in the two slide rail grooves (10).

3. A modular cutting tool structure according to Claim 1 wherein, It also includes two gear shafts (11), two springs (12) and two gear rings (13). The two gear shafts (11) are slidably inserted into the two ends of the rotating shaft (4). The outer ends of the two springs (12) are connected to the two gear shafts (11) respectively, and the inner ends of the two springs (12) are connected to the blade (2). Multiple positioning teeth are provided on the outer circumference of the two gear shafts (11). The two gear rings (13) are installed on the outer walls of the two sides of the blade (2) respectively. The two gear rings (13) are arranged concentrically with the two gear shafts (11). The multiple positioning teeth of the two gear shafts (11) mesh with the two gear rings (13) respectively.

4. The combined cutting tool structure as described in claim 3, characterized in that, It also includes two marker points one (14) and two marker points two (15). Marker point one (14) is installed on the outer end face of both gear shafts (11), and two marker points two (15) are set opposite each other on the outer wall of the blade (2). The two marker points two (15) are aligned with the two marker points one (14) respectively.

5. The combined cutting tool structure as described in claim 1, characterized in that, It also includes slots (16), blocks (17) and bolts (18). The outer ends of the upper push rod (7) and the lower push rod (8) are provided with slots (16), and the inner ends of the two cutting heads (3) are provided with blocks (17). The two blocks (17) are respectively inserted into the two slots (16). The two slots (16) and the two blocks (17) are provided with insertion holes. The two bolts (18) respectively screw the upper push rod (7) and the cutting head (3), and the lower push rod (8) and the cutting head (3) together.

6. The combined cutting tool structure as described in claim 5, characterized in that, It also includes two clearance holes (19). Clearance holes (19) are provided on both sides of the blade (2). The clearance holes (19) are aligned with the bolts (18).

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