Cutting device for copper bar heat-shrinkable tubing

Abstract

The utility model discloses a cutting device for a copper bar heat-shrinkable sleeve. The cutting device comprises an operation table, a fixing mechanism, a crimping mechanism, a cutting mechanism and a limiting mechanism, the fixing mechanism is arranged on the surface of the operation table and used for fixing a copper bar, the crimping mechanism is connected with the cutting mechanism, and the crimping mechanism can control the cutting mechanism to move in the space above the operation table and cut the copper bar heat-shrinkable tubing at a preset cutting position. The limiting mechanism is arranged on the fixing mechanism, the limiting mechanism and the fixing mechanism can be configured to be in a locking state and an unlocking state, and when the limiting mechanism and the fixing mechanism are configured to be in the locking state, the limiting mechanism is fixed to the fixing mechanism; when the limiting mechanism and the fixing mechanism are configured to be in an unlocking state, the limiting mechanism is movably matched with the fixing mechanism and slides along the surface of the fixing mechanism. A special cutting mechanism is developed according to the specific size of the installation bolt to complete cutting operation at a time, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of heat shrink tubing cutting technology, and in particular to a cutting device for copper busbar heat shrink tubing. Background Technology

[0002] Before assembly, the copper busbars used in electrical cabinets require baking and the application of different colored heat-shrink tubing to distinguish positive and negative terminals and provide insulation. The heat-shrink tubing covers the screw holes and the contact surfaces between the mounting bolts and the copper busbars. Without proper handling, the presence of the tubing can lead to insecure installation. Furthermore, the insulation layer of the tubing can impede normal current conduction, causing electrical faults. Therefore, to ensure reliable electrical connections, the screw hole areas and the contact surfaces between the bolts and the copper busbars must be exposed for conductivity. Thus, the heat-shrink tubing in these two areas must be removed.

[0003] Currently, employees typically use utility knives to cut and remove the heat shrink tubing covering the copper busbars. However, this method is very inefficient. Furthermore, using a utility knife makes it difficult to ensure a smooth and consistent cut, leading to a certain percentage of defective products that require rework, further reducing efficiency. In addition, using a utility knife poses certain safety hazards. In existing devices, a hole-locating shaft is usually inserted through a hole in the copper busbar, allowing the blade to make close contact with the heat shrink tubing. The entire device rotates 360 degrees around the vertical axis of the hole-locating shaft. This allows the blade to automatically cut a neat hole in the heat shrink tubing. However, this method requires circular cutting and cannot complete the entire process in one go, resulting in relatively low cutting efficiency. Utility Model Content

[0004] The main objective of this invention is to provide a cutting device for copper busbar heat shrink tubing, thereby overcoming the shortcomings of the prior art.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0006] This utility model provides a cutting device for copper busbar heat shrink tubing, including an operating table, a fixing mechanism, a crimping mechanism, a cutting mechanism, and a limiting mechanism. The fixing mechanism is provided on the surface of the operating table for fixing the copper busbar. The crimping mechanism is connected to the cutting mechanism and can control the cutting mechanism to move in the space above the operating table and cut the copper busbar heat shrink tubing at a preset cutting position. The limiting mechanism is provided on the fixing mechanism. The limiting mechanism and the fixing mechanism can be configured to a locked state and an unlocked state. When the limiting mechanism and the fixing mechanism are configured to be locked, the limiting mechanism is fixed to the fixing mechanism. When the limiting mechanism and the fixing mechanism are configured to be unlocked, the limiting mechanism and the fixing mechanism are movablely engaged and slide along the surface of the fixing structure.

[0007] In some more specific solutions, the fixing mechanism includes a fixing seat, on which a fixing groove is provided, and the fixing groove extends along a first direction to the edge of the fixing seat.

[0008] Preferably, the cross-section of the fixing groove along the second direction is rectangular, wherein the second direction is perpendicular to the first direction.

[0009] Furthermore, the limiting mechanism includes a limiting seat, limiting tracks arranged on both sides of the fixing groove along the second direction, a limiting block structure, and a locking structure. The limiting seat is disposed on the surface of the fixing seat, the limiting seat extends entirely along the second direction, and the limiting tracks extend along the first direction.

[0010] The limiting seat and the fixed seat are configured to a locked state and an unlocked state. When the limiting seat and the fixed seat are configured to be locked, the limiting seat is fixed to the limiting track by the limiting block structure and the locking structure. When the limiting seat and the fixed seat are configured to be unlocked, the limiting seat is movably engaged with the limiting track and slides along the surface of the limiting track.

[0011] Furthermore, the limiting track is disposed inside the fixed base, and the limiting block structure is disposed inside the limiting track.

[0012] When the limiting seat and the fixed seat are configured in the locked state, the locking structure passes through the limiting seat and the limiting track, and is fixed to the limiting block structure, thus fixing the limiting seat to the limiting track; when the limiting seat and the fixed seat are configured in the unlocked state, the locking structure passes through the limiting seat and the limiting track, and is released from the limiting block structure, thus allowing the limiting seat to slide along the surface of the limiting track.

[0013] Furthermore, the limiting track includes a first side groove, a first guide groove, a second side groove, and a second guide groove; the limiting block structure includes a first limiting block and a second limiting block; the locking structure includes a first fastener and a second fastener; the fixing groove, along a second direction, has a first side groove and a second side groove respectively formed on both sides of its width; the first side groove has a first guide groove formed on the direction near the surface of the fixing seat; the second side groove has a second guide groove formed on the direction near the surface of the fixing seat; the first side groove communicates with the first guide groove; the second side groove communicates with the second guide groove; the first limiting block is disposed in the first side groove; the second limiting block is disposed in the second side groove; the limiting seat is provided with a first fastener and a second fastener; and the first fastener passes through the first guide groove and is movably connected to the first limiting block, and the second fastener passes through the second guide groove and is movably connected to the second limiting block.

[0014] When the limiting seat and the fixed seat are configured in the locked state, the first fastener passes through the first guide groove and is fixedly connected to the first limiting block, and the second fastener passes through the second guide groove and is fixedly connected to the second limiting block. When the limiting seat and the fixed seat are configured in the unlocked state, the first fastener passes through the first guide groove and is released from the first limiting block, and the second fastener passes through the second guide groove and is released from the second limiting block. The first limiting block can slide along the first guide groove and the first side groove in a first direction, and the second limiting block can slide along the second guide groove and the second side groove in a first direction.

[0015] Preferably, the first limiting block and the first fastener are movably connected by a bolt structure, and the second limiting block and the second fastener are movably connected by a bolt structure.

[0016] In some more specific solutions, the pressing mechanism includes a support frame, an adjustment structure, and a drive structure. The support frame supports the adjustment structure, and the drive structure is connected to the adjustment structure. The adjustment structure can move vertically in the space above the operating table to determine the initial cutting depth. The cutting mechanism is connected to the adjustment structure and performs cutting under the drive of the adjustment structure.

[0017] Furthermore, the support frame includes a first support portion and a second support portion that are in contact with each other. The first support portion extends vertically to support the adjustment structure, and the second support portion extends horizontally to mount the operating table.

[0018] Preferably, the adjustment structure includes a base, an adjustment seat, and an adjustment rod, wherein a first adjustment groove is formed on the base, and the adjustment seat and the adjustment rod are disposed in the first adjustment groove.

[0019] Preferably, the first support extends vertically and has an adjustment guide groove. The base and the adjustment guide groove can be configured to be locked and unlocked for the first adjustment. An adjustment nut is provided on the base. The adjustment nut, through a screw mechanism, can adjust the vertical position of the base when the adjustment nut is rotated for the second adjustment.

[0020] Furthermore, the first adjustment groove includes a first side surface, a second side surface, a third side surface, and a top surface and a bottom surface arranged opposite to each other. The adjustment seat is fixed to the first side surface, the second side surface, and the third side surface respectively. The adjustment seat is provided with a second adjustment groove. One end of the adjustment rod is embedded in the second adjustment groove, and the other end is provided on the bottom surface of the first adjustment groove.

[0021] Preferably, the driving structure includes a first driving rod and a second driving rod in contact with each other. The second driving rod passes through the first adjusting groove and is fixedly connected to the base and the adjusting seat. Under the drive of the second driving rod, the adjusting rod drives the cutting device to cut in the vertical direction.

[0022] Preferably, the first drive rod and the second drive rod are connected in an L-shape.

[0023] In some more specific solutions, the cutting mechanism includes a blade structure, which includes a cutting blade and a blade holder, with the cutting blade mounted on the blade holder.

[0024] Preferably, the tool holder has a cylindrical structure, and the cutting blade is arranged circumferentially along the bottom of the tool holder.

[0025] Furthermore, the cutting mechanism also includes a positioning structure, which is disposed on the tool holder.

[0026] Preferably, the positioning structure is a positioning post, which is a cylindrical structure. The positioning post is fixed inside the cavity of the tool holder and extends out of the cavity along the central axis.

[0027] Preferably, the portion of the positioning post extending beyond the chamber has a flat-end chamfered cylindrical structure.

[0028] Compared with the prior art, the advantages of this utility model include at least the following:

[0029] To address the dimensions of the mounting bolts, a specialized circular cutter was developed to achieve one-time cutting, thereby improving production efficiency. At the same time, the use of positioning pins enhanced the consistency of operations and effectively reduced the generation of defective products. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of a cutting device for copper busbar heat shrink tubing provided in an embodiment of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the limiting seat provided in this embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the limiting structure provided in an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the positioning column provided in an embodiment of the present invention;

[0034] Figure 5 This is a structural schematic diagram of the support frame provided in an embodiment of the present utility model.

[0035] 1. Operating table; 2. Fixed base; 31. Limiting seat; 32. First fastener; 33. Second fastener; 34. First limiting block; 35. Second limiting block; 36. First side groove; 37. Second side groove; 38. First guide groove; 39. Second guide groove; 41. Support frame; 42. Base; 43. Adjusting seat; 44. Adjusting rod; 45. First drive rod; 46. Second drive rod; 47. Adjusting nut; 48. Fixing screw; 51. Tool holder; 52. Positioning column. Detailed Implementation

[0036] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0037] Please refer to Figure 1 A cutting device for copper busbar heat shrink tubing includes an operating table 1, a fixing mechanism, a limiting mechanism, a crimping mechanism, and a cutting mechanism. The following is a detailed description of each component:

[0038] In this design, the fixing mechanism includes a fixing base 2. A fixing groove specifically for fixing the copper busbar is formed on the surface of the fixing base 2. The fixing groove extends along a first direction until it reaches the edge of the fixing base 2. Furthermore, regarding the cross-section of the fixing groove, its shape in a second direction is rectangular, and the second direction is perpendicular to the first direction. It is worth noting that the height of this fixing groove is greater than the thickness of the copper busbar.

[0039] In this solution, the limiting mechanism includes a limiting seat 31, a first side groove 36, a first guide groove 38, a second side groove 37, a second guide groove 39, a first limiting block 34, a second limiting block 35, a first fastener 32, and a second fastener 33.

[0040] The limiting seat 31 is mounted on the surface of the fixed seat 2 and extends along the second direction as a whole. Its dimension in the second direction is larger than the dimension of the fixing groove on the fixed seat in the same direction. The first side groove 36, the first guide groove 38, the second side groove 37, and the second guide groove 39 extend along the first direction as a whole.

[0041] On the fixing groove of the fixing base 2, a first side groove 36 is formed on the first side along the second direction, and a second side groove 37 is formed on the second side. A first guide groove 38 is further formed on the first side groove 36 in the direction close to the surface of the fixing base 2. Similarly, a second guide groove 39 is also formed on the second side groove 37 in the direction close to the surface of the fixing base 2. The first side groove 36 and the first guide groove 38 are interconnected, and the second side groove 37 and the second guide groove 39 are also interconnected.

[0042] The first limiting block 34 is placed in the first side groove 36, while the second limiting block 35 is placed in the second side groove 37. The limiting seat 31 is also specially designed with mounting positions for the first fastener 32 and the second fastener 33. Both the first limiting block 34 and the second limiting block 35 are provided with threaded holes to facilitate the installation of the two screws, the first fastener 32 and the second fastener 33. The first fastener 32 passes through the first guide groove 38 and is fixed to the first limiting block 34, while the second fastener 33 passes through the second guide groove 39 and is fixed to the second limiting block 35. In this way, the first limiting block 34 can slide in the first direction within the first guide groove 38 and the first side groove 36; similarly, the second limiting block 35 can also slide in the first direction within the second guide groove 39 and the second side groove 37.

[0043] In this design, the pressing mechanism includes a support frame 41, an adjustment structure, and a drive structure. The support frame 41 consists of two main parts: a first support section and a second support section. The first support section is designed to extend vertically, allowing it to move and engage with the adjustment structure in the vertical direction. The second support section extends primarily horizontally, and its main function is to provide a stable mounting base for the operating table 1. The adjustment structure consists of a base 42, an adjustment seat 43, and an adjustment rod.

[0044] Please refer to Figure 1 and Figure 5 The first support extends vertically and includes an adjustment guide groove. This groove engages with the base 42 and can be locked or unlocked for initial adjustment. More specifically, the base 42 and the adjustment guide groove are locked together by a fixing screw 48. Furthermore, the base 42 is equipped with an adjusting nut 47. Through a screw mechanism, rotating the adjusting nut 47 adjusts the vertical position of the base 42, enabling a more precise second adjustment.

[0045] The base 42 is provided with a first adjustment groove, within which the adjustment seat 43 and the adjustment rod are disposed. The first adjustment groove includes continuous side surfaces, specifically a first side surface, a second side surface, a third side surface, and a top surface and a bottom surface arranged opposite to each other. The adjustment seat 43 is fixedly connected to these side surfaces, ensuring the stability and precise adjustment capability of the adjustment seat. The adjustment seat 43 is also provided with a second adjustment groove, into which one end of the adjustment rod is embedded, while the other end is disposed on the bottom surface of the first adjustment groove.

[0046] The drive mechanism is in the form of a press-fit handle and includes two main drive rods, namely the first drive rod 45 and the second drive rod 46. These two drive rods are connected to each other in an L-shape, a design that provides sufficient torque to drive the adjustment mechanism.

[0047] The working principle of the entire adjustment structure is as follows:

[0048] First, loosen the fixing screw 48 and lower the second drive rod 46 to its lowest position. Next, adjust the cutting blade to the appropriate position to ensure accurate cutting. After adjustment, tighten the fixing screw 48 again to ensure the adjusting guide groove is locked to the base 42, thus determining the final cutting depth. Then, rotate the adjusting nut 47 to align the cutting blade with the heat shrink sleeve hole on the copper busbar, thereby determining the final cutting position and ensuring the accuracy and efficiency of the cutting operation.

[0049] Specific driving principle:

[0050] In this design, the cutting mechanism mainly consists of two parts: a blade structure and a positioning structure. The blade structure includes a cutting blade for the cutting operation and a blade holder 51 that supports the cutting blade. The cutting blade is mounted on the blade holder 51 to ensure the accuracy and efficiency of the cutting operation. The positioning structure, located on the blade holder 51, ensures the accurate positioning of the cutting blade and provides precise cutting positioning.

[0051] The cutter holder 51 adopts a cylindrical structure, a design that facilitates the installation and replacement of the cutting blades. The cutting blades are evenly spaced along the bottom circumference of the holder 51, ensuring uniformity and consistency in the cutting operation. Furthermore, the diameter of the circular cutting blades matches the diameter of the copper busbar screw holes, ensuring cutting precision and preventing unnecessary damage to the copper busbars. The circular cutting blades can be made of special mold steel, which possesses extremely high hardness and wear resistance, capable of withstanding prolonged cutting operations without losing sharpness. Depending on actual needs, the diameter of the cutting blades can be designed to be adjustable to accommodate different screw hole sizes; or it can be designed to be replaceable for quick changes to different sized cutting blades, thereby improving work efficiency.

[0052] The positioning structure is a positioning post 52, a cylindrical structure fixed inside the cavity of the tool holder 51, extending out of the cavity along the central axis. The portion of the positioning post 52 extending beyond the cavity is a flat-end chamfered cylinder structure. This design ensures structural strength while facilitating operation. Specifically, the flat-end chamfered cylinder structure is a "smooth cylinder + chamfer + flat bottom" design, which helps to easily insert the positioning post 52 into the copper busbar screw hole during operation. By ensuring that the center of the circular cutting blade is completely aligned with the center of the screw hole (i.e., achieving "coaxial positioning"), the circumferential cutting trajectory can be accurately centered on the screw hole. Centered on the screw hole, a circular sleeve matching the bolt diameter is cut off, ensuring that the bolt can smoothly pass through the screw hole and make tight contact with the copper busbar. By adjusting the downward pressure depth of the cutting blade, damage to the copper busbar body can be avoided, and only the sleeve is removed. The drive circular cutter presses down vertically, making a regular circular cut along the positioning post 52, removing the sleeve around the screw hole and the contact surface in one go, thus achieving efficient and precise cutting operations.

[0053] The following will detail the specific operation and usage process:

[0054] First, the first step: Place the copper busbar without heat shrink tubing into the fixing groove. Adjust the position of the base 42 based on the position of the upper surface of the copper busbar to determine the cutting position and depth of the circular cutter. Next, adjust the position of the limiting seat 31 by loosening the first fastener 32 and the second fastener 33 according to the position of the copper busbar screw holes. Once the center positioning post of the circular cutter is fully aligned with the copper busbar screw holes, tighten the first fastener 32 and the second fastener 33 to fix the position of the limiting seat 31. After completing these steps, remove the copper busbar without heat shrink tubing.

[0055] Step 2: Place the preheated heat-shrink tubing copper busbar into the fixing groove. The thickness of the copper busbar is slightly greater than the height of the fixing groove. This is to ensure that the copper busbar can properly abut against the limiting seat 31 when placed in the fixing groove, preventing the copper busbar from moving or sliding.

[0056] Step 3: Press the first drive lever 45 to the lowest point to ensure that the cutting blade can cut the copper busbar smoothly. Release the first drive lever 45 and remove the copper busbar.

[0057] Step 4: Place the copper busbar with the other side facing up in the fixing groove, and press the first drive rod 45 again to the lowest point to cut. After completing the double-sided cutting, clean off the cut heat shrink tubing to ensure the copper busbar surface is clean and tidy;

[0058] Step 5: Repeat steps 2, 3, and 4 above to achieve continuous operation and improve work efficiency.

[0059] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cutting device for heat shrink tubing of copper bars, characterized in that, The operation table is provided with a fixing mechanism on the surface for fixing the copper bar, the crimping mechanism is connected with the cutting mechanism, the crimping mechanism can control the cutting mechanism to move in the space above the operation table, and the copper bar heat shrink sleeve is cut at the preset cutting position, the limiting mechanism is arranged on the fixing mechanism, and the limiting mechanism and the fixing mechanism can be configured as a locked state and an unlocked state.

2. The cutting device of claim 1, wherein, The fixing mechanism comprises a fixing seat, a fixing groove is formed in the fixing seat, and the fixing groove extends to the edge of the fixing seat along the first direction, And / or, the cross section of the fixing groove along the second direction is rectangular, wherein the second direction is perpendicular to the first direction.

3. The cutting device of claim 2, wherein, The limiting mechanism comprises a limiting seat, limiting rails arranged on both sides of the fixing groove along the second direction, a limiting block structure, and a locking structure, the limiting seat is arranged on the surface of the fixing seat, and the limiting seat extends along the second direction, The limiting seat and the fixing seat are configured as a locked state and an unlocked state, when the limiting seat and the fixing seat are configured as a locked state, the limiting seat is fixed to the limiting rail through the limiting block structure and the locking structure; When the limiting seat and the fixing seat are configured as an unlocked state, the limiting seat and the limiting rail are movably connected, and slide along the surface of the limiting rail.

4. The cutting device of claim 3, wherein, The limiting rail is arranged in the fixing seat, and the limiting block structure is arranged in the limiting rail, When the limiting seat and the fixing seat are configured as a locked state, the locking structure passes through the limiting seat, the limiting rail, and the limiting block structure to fix the limiting seat to the limiting rail; When the limiting seat and the fixing seat are configured as an unlocked state, the locking structure is loosened through the limiting seat, the limiting rail and the limiting block structure, and the limiting seat slides along the surface of the limiting rail.

5. The cutting device of claim 4, wherein, The limiting rail comprises a first side groove, a first guide groove, a second side groove and a second guide groove, the limiting block structure comprises a first limiting block and a second limiting block, the locking structure comprises a first fastener and a second fastener, the fixing groove is provided with a first side groove and a second side groove on both sides of the width along the second direction, the first side groove is provided with a first guide groove in the direction close to the surface of the fixing seat, the second side groove is provided with a second guide groove in the direction close to the surface of the fixing seat, the first side groove and the first guide groove are in communication, the second side groove and the second guide groove are in communication, the first limiting block is arranged in the first side groove, the second limiting block is arranged in the second side groove, the limiting seat is provided with a first fastener and a second fastener, the first fastener is movably connected with the first limiting block through the first guide groove, and the second fastener is movably connected with the second limiting block through the second guide groove, When the limiting seat and the fixing seat are configured in the locked state, the first fastener is fixedly connected with the first limiting block through the first guide slot, and the second fastener is fixedly connected with the second limiting block through the second guide slot; when the limiting seat and the fixing seat are configured in the unlocked state, the first fastener is loosened from the first limiting block through the first guide slot, and the second fastener is loosened from the second limiting block through the second guide slot, and the first limiting block can slide in the first direction along the first guide slot and the first side edge slot, and the second limiting block slides in the first direction along the second guide slot and the second side edge slot, And / or, the first limiting block and the first fastener are movably connected through a bolt structure, and the second limiting block and the second fastener are movably connected through a bolt structure.

6. The cutting device of claim 1, wherein, The crimping mechanism comprises a support frame, an adjusting structure and a driving structure, the support frame is used for supporting the adjusting structure, the driving structure is connected with the adjusting structure, the adjusting structure can move vertically in the space above the operation table to determine the initial cutting depth, and the cutting mechanism is connected with the adjusting structure and cuts under the driving of the adjusting structure.

7. The cutting device of claim 6, wherein, The support frame comprises a first support part and a second support part in contact, the first support part extends in the vertical direction as a whole and is used for supporting the adjusting structure, and the second support part extends in the horizontal direction as a whole and is used for mounting the operation table, And / or, the adjusting structure comprises a base, an adjusting seat and an adjusting rod, a first adjusting groove is formed in the base, and the adjusting seat and the adjusting rod are arranged in the first adjusting groove, And / or, the first support part extends in the vertical direction as a whole and is provided with an adjusting guide groove, the base can be configured in the locked state and the unlocked state in the adjusting guide groove to perform first adjustment, and the base is provided with an adjusting nut, the adjusting nut can adjust the vertical position of the base by rotating the adjusting nut through a screw rod mechanism to perform second adjustment.

8. The cutting device of claim 7, wherein, The first adjusting groove comprises a first side, a second side, a third side and a top surface and a bottom surface arranged oppositely in sequence, the adjusting seat is fixed with the first side, the second side and the third side respectively, a second adjusting groove is formed in the adjusting seat, one end of the adjusting rod is embedded in the second adjusting groove, and the other end is arranged on the bottom surface of the first adjusting groove; And / or, the driving structure comprises a first driving rod and a second driving rod in contact, the second driving rod penetrates through the first adjusting groove and is fixedly connected with the base and the adjusting seat, and the adjusting rod drives the cutting device to cut in the vertical direction under the driving of the second driving rod, And / or, the first driving rod and the second driving rod are L-shaped in contact.

9. The cutting device of claim 1, wherein, The cutting mechanism comprises a blade structure, the blade structure comprises a cutting knife and a knife holder, and the cutting knife is mounted on the knife holder, And / or, the knife holder is a cylindrical structure, and the cutting knife is arranged in the circumferential direction at the bottom of the knife holder.

10. The cutting device of claim 9, wherein, The cutting mechanism further comprises a positioning structure arranged on the knife holder, And / or, the positioning structure is a positioning column, which is a cylindrical structure, the positioning column is fixed in a cavity inside the tool holder, and extends out of the cavity along the central axis direction, And / or, the end part of the positioning column beyond the cavity is a flat end chamfered cylindrical structure.

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