Cutter locking structure

Abstract

The utility model belongs to the technical field of cutter disassembly and assembly, and particularly relates to a cutter locking structure which comprises a cutter and a cutter handle, and a cam tensioning mechanism is arranged between the cutter and the cutter handle. The cam tensioning mechanism comprises a lock shaft and an eccentric wheel installed on the lock shaft, an axial tensioning piece is arranged between the cutter and the cutter handle, the axial tensioning piece is movably assembled in the cutter handle, one end of the axial tensioning piece is in threaded connection with the cutter, and a tensioning hole is formed in the axial tensioning piece; or a tensioning hole is formed in the short taper shank of the cutter; the axis of the tensioning hole coincides with the central axis of the cutter handle and is perpendicular to the axis of the lock shaft. The lock shaft can rotate relative to the cutter handle, penetrates into the cutter handle and is connected with the tensioning hole in an inserted mode so that the eccentric wheel can be located in the tensioning hole, the eccentric outer side of the eccentric wheel makes contact with the hole wall of the tensioning hole, and the eccentric wheel drives the cutter to move in the axial direction of the eccentric wheel under rotation of the lock shaft so as to tension the cutter. And a locking structure is arranged between the lock shaft and the knife handle. The tool can be prevented from loosening and rotating relative to the tool handle, machining precision is guaranteed, machining efficiency is improved, and machining cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of tool disassembly and assembly technology, and specifically relates to a tool locking structure. Background Technology

[0002] The short taper connection structure features high precision, high rigidity, and quick assembly and disassembly, and is widely used in the connection between cutting tools and tool holders.

[0003] In the field of mechanical connections, especially in applications involving high-precision transmission and positioning, short tapered connection structures are commonly used, such as the assembly of a tool holder and a ball end. The ball-end tapered shank connection structure, as a common short tapered connection structure, typically employs a double-ended stud thread connection. Its core principle is to axially tighten the tool holder and ball end using a double-ended stud with reverse threads at both ends. The specific structure is as follows... Figure 1 As shown, the two ends of the double-ended stud 103 are respectively machined with external threads in opposite directions. The external thread at one end mates with the internal thread hole of the tool holder 102, while the external thread at the other end mates with the internal thread hole of the short cone on the ball head 101. By rotating the double-ended stud, the threads at both ends generate preload simultaneously, which pulls the short cone of the ball head and the tool holder axially.

[0004] The advantages of using a double-ended stud connection are:

[0005] 1. Simple structure, requiring only a stud and a threaded hole for connection;

[0006] 2. Low cost, mature thread processing technology, and easy to standardize production;

[0007] 3. Reliable axial positioning, and the conical surface fit provides high radial stiffness.

[0008] Although double-ended stud connections are widely used, they also exhibit significant drawbacks in practical applications. Because the threads at both ends of a double-ended stud rotate in opposite directions, under high-speed rotation or alternating loads, uneven stress can cause one side of the stud to loosen or even completely fail, necessitating frequent tool disassembly and assembly. Furthermore, the short taper ball joint resists torque only through conical surface friction with the tool holder; if the preload is insufficient or the contact surface is worn, relative rotation between the tool and the tool holder can easily occur. These defects can lead to reduced machining accuracy, decreased machining efficiency, and increased machining costs. Utility Model Content

[0009] The purpose of this utility model is to provide a tool locking structure to solve the technical problems that easily lead to reduced machining accuracy, reduced machining efficiency, and increased machining costs when the short tapered connection structure adopts the traditional double-headed bolt connection.

[0010] To solve the above problems, the tool locking structure provided by this utility model adopts the following technical solution:

[0011] The tool locking structure comprises a tool and a tool holder, and a cam tensioning mechanism is arranged between the tool and the tool holder.

[0012] The cam tensioning mechanism comprises a lock shaft and an eccentric wheel mounted on the lock shaft.

[0013] An axial tensioning piece is arranged between the tool and the tool holder, the axial tensioning piece is movably assembled in the tool holder and is threadedly connected to the tool at one end, and the axial tensioning piece is provided with a tensioning hole; or a tensioning hole is arranged on a short taper shank of the tool; and the axis of the tensioning hole is perpendicular to the central axis of the tool holder.

[0014] The lock shaft can rotate relative to the tool holder, and the lock shaft penetrates into the tool holder and is inserted into the tensioning hole, so that the eccentric wheel is located in the tensioning hole, the eccentric outer side of the eccentric wheel is in contact with the hole wall of the tensioning hole, and the eccentric wheel drives the tool to move along the axial direction under the rotation of the lock shaft to tension the tool.

[0015] A locking structure is arranged between the lock shaft and the tool holder to lock the lock shaft when the lock shaft is rotated in place.

[0016] The tool locking structure of the utility model has the beneficial effects that: the cam tensioning mechanism is used to replace the traditional double-end stud connection mode, the tool is directly tensioned or indirectly tensioned through the axial tensioning piece, force is transmitted by relying on the geometric shape of the eccentric wheel in the cam tensioning mechanism, the friction force is not needed, the risk of easy loosening of the thread caused by the double-end stud is reduced, and the connection stability is improved. In addition, the contact between the eccentric wheel and the tensioning hole is linear contact, which can uniformly distribute the load, compared with the point contact of the traditional thread, the local stress concentration can be reduced; when the cam shaft is inserted into the tensioning hole along the radial direction of the tool holder, the rotation direction of the tool is perpendicular to each other, so that the tool can be prevented from rotating relative to the tool holder, and the stability of the tool work is improved; furthermore, the tool can be tensioned by rotating the cam shaft, the locking structure can lock the cam shaft after being rotated in place, accidental loosening can be prevented, repeated screwing of the thread is not needed, and the tool can be quickly disassembled and assembled. During the machining process, the tool locking structure can ensure the stable work of the tool, ensure the machining precision, avoid frequent disassembly and assembly, ensure the machining efficiency, and save the machining cost.

[0017] Further, the shank is provided with a socket for inserting the lock shaft, the locking structure includes a limiting protrusion and a protruding platform arranged in the socket, a stop protrusion and a stop ring arranged on the lock shaft, and a retreat stop arranged on the shank; the stop ring is provided with an avoiding slot for avoiding the limiting protrusion, the limiting protrusion and the protruding platform are arranged in the axial direction of the socket to accommodate the stop ring; the protruding platform has a first stop portion and a second stop portion, the retreat stop has elasticity and is arranged between the first stop portion and the second stop portion; when the stop protrusion is in stop cooperation with the first stop portion, the lock shaft is in an unlocking position, when the stop protrusion passes through the retreat stop and is in stop cooperation with the second stop portion in the process of rotating the lock shaft, the lock shaft is in a locking position; the retreat stop is used for blocking the stop protrusion when the stop protrusion is in the locking position; the limiting protrusion is used for being in stop cooperation with the stop ring in the axial direction of the socket.

[0018] Beneficial effects: the limiting protrusion can be in stop cooperation with the stop ring in the process of rotating the lock shaft, which can limit the radial movement of the lock shaft and avoid the eccentric wheel from being pulled out of the tension hole; by arranging the protruding platform, the installation and locking of the lock shaft can be quickly realized; the retreat stop can prevent the lock shaft from being accidentally rotated when the lock shaft is rotated to the position, that is, the tool is pulled to the position, which enhances the locking reliability and ensures the stability of the tool connection.

[0019] Further, the first stop portion is a stop inclined surface, and the second stop portion is a stop curved surface; the stop protrusion is provided with a matching inclined surface matched with the stop inclined surface and a matching curved surface matched with the stop curved surface on both sides.

[0020] Beneficial effects: the design of the stop inclined surface and the stop curved surface makes the lock shaft rotate smoothly between the unlocking and locking states, and reduces the operation force. In addition, the stop curved surface can increase the contact area of the stop protrusion and the second stop portion, thereby ensuring the locking reliability of the lock shaft. The stop inclined surface guides the stop protrusion to automatically push the lock shaft outward by a small distance, which facilitates the quick disassembly of the lock shaft.

[0021] Further, the retreat stop is an elastic cylindrical pin.

[0022] Beneficial effects: the elastic cylindrical pin occupies a small space, can adapt to the narrow space in the shank, is easy to install, and can provide reliable elastic resistance. In addition, the elastic cylindrical pin is a standardized part, which is easy to purchase and replace.

[0023] Further, the eccentric wheel and the lock shaft are integrally formed.

[0024] Beneficial effects: the integral forming can reduce the assembly steps, avoid the coaxiality error when connecting multiple parts, ensure the synchronous rotation of the eccentric wheel and the lock shaft, reduce the risk of loosening, and is suitable for high-speed rotation scenes.

[0025] Further, the eccentric wheel is in a cylindrical shape.

[0026] Beneficial effect: the cylindrical surface is in line contact with the tension hole, which uniformly distributes the load and reduces local stress concentration. The cylindrical surface can be manufactured with high precision by milling process, reducing manufacturing cost.

[0027] Further, the inner side of the eccentric wheel is tangent to the outer surface of the lock shaft.

[0028] Beneficial effect: the tangent design minimizes the radial dimension of the overall structure, saving space and suitable for narrow environment such as tool shank. Standard milling cutter can be used for one-time forming during processing, simplifying manufacturing process.

[0029] Further, the end of the lock shaft is provided with a tool interface.

[0030] Beneficial effect: it is convenient to rotate the lock shaft using tools (such as wrench), improving the operation convenience. The interface can be standardized, adapting to various tools and enhancing the versatility.

[0031] One of the technical solutions is that an axial tensioning member is arranged between the tool and the tool shank, the cam tensioning mechanism is provided with one, the tension hole is a through hole, and the lock shaft passes through the tension hole and is inserted into the insertion hole.

[0032] Beneficial effect: when a single cam tensioning mechanism is used, the structure can be simplified, the number of parts can be reduced, and the length of the tool shank can be shortened. The through hole design facilitates the installation and positioning of the lock shaft, without the need for complex alignment steps, improving the assembly efficiency.

[0033] Another technical solution is that two coaxially arranged tension holes are arranged on the short taper shank of the tool, the tension holes are blind holes, and the cam tensioning mechanism is provided with two.

[0034] Beneficial effect: the double cam tensioning mechanism acts synchronously, which can provide greater tensioning force, enhance the anti-twisting ability, and improve the stability of the connection between the tool and the tool shank. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic diagram of the ball head taper shank connection structure adopting a double-headed stud in the prior art;

[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of embodiment 1 of the tool locking structure of the utility model;

[0037] Figure 3 It is a front view of Figure 2 ;

[0038] Figure 4 It is an A-A sectional view of Figure 3 ;

[0039] Figure 5This is a three-dimensional structural diagram of the tool holder in Embodiment 1 of the tool locking structure of this utility model;

[0040] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0041] Figure 7 This is a three-dimensional structural diagram of the axial tensioning member in Embodiment 1 of the tool locking structure of this utility model;

[0042] Figure 8 This is a front view of the axial tensioning member in Embodiment 1 of the tool locking structure of this utility model;

[0043] Figure 9 This is a three-dimensional structural diagram of the cam tensioning mechanism in Embodiment 1 of the tool locking structure of this utility model;

[0044] Figure 10 for Figure 9 The main view;

[0045] Figure 11 for Figure 9 Left side view;

[0046] Figure 12 for Figure 9 The right-side view;

[0047] Figure 13 This is a schematic diagram of Embodiment 2 of the tool locking structure of this utility model;

[0048] Figure 14 for Figure 13 BB section view;

[0049] Figure 15 This is a schematic diagram of the cam tensioning mechanism in Embodiment 2 of the tool locking structure of this utility model;

[0050] Figure 16 This is a schematic diagram of the tool structure in Embodiment 2 of the tool locking structure of this utility model.

[0051] Explanation of reference numerals in the attached figures:

[0052] 101. Ball end; 102. Double-ended stud; 103. Tool holder;

[0053] 1. Cutting tool; 2. Tool holder; 21. Insertion hole; 22. Limiting protrusion; 23. Protruding platform; 24. First stop; 25. Second stop; 26. Anti-reverse groove; 3. Cam tensioning mechanism; 31. Locking shaft; 311. Tool interface; 32. Eccentric wheel; 33. Retaining ring; 34. Clearance groove; 35. Stop protrusion; 351. Mating inclined surface; 352. Mating curved surface; 4. Axial tensioning component; 41. Tensioning hole; 42. External thread section; 43. Water inlet guide hole; 5. Anti-reverse component;

[0054] 201, cutting tool; 2011, taper shank; 2012, tensioning hole; 202, tool holder; 203, cam tensioning mechanism; 2031, locking shaft; 2032, eccentric wheel. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0056] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0057] Example 1 of the tool locking structure provided by this utility model:

[0058] like Figure 2 and Figure 3 As shown, the locking structure of the tool 1 includes the tool 1, the axial tensioning member 4, the tool holder 2, and the cam tensioning mechanism 3.

[0059] Specifically, tool 1 is a tensioning tool with a tapered shank structure, and the tapered shank of tool 1 has a threaded hole. In this embodiment, tool 1 is... Figure 2 The ball end mill shown is used as an example for illustration, but the tool 1 described in this utility model is not limited to ball end mills. It is applicable to any tensioning tool with a tapered shank structure.

[0060] like Figure 5 and Figure 6 As shown, the tool holder 2 is a tensioning tool holder 2 that matches the tool 1. The tool holder 2 has a recess 21 extending radially through it. One end of the recess 21 has a larger diameter, and the other end has a smaller diameter. A backlash groove 26 is also provided on the side of the recess 21 with a larger diameter, and the backlash groove 26 is connected to the recess 21.

[0061] like Figure 4 , Figure 7 andFigure 8 As shown, the axial tensioning member 4 is assembled inside the tool holder 2 and has a symmetrical structure, allowing it to move along the central axis of the tool holder 2. One end of the axial tensioning member 4 is an externally threaded section 42 for threaded connection with the tapered shank of the tool 1. The other end of the axial tensioning member 4 is provided with a tensioning hole 41, which is a through hole with a diameter larger than that of the insertion hole 21; the axis of the tensioning hole 41 is perpendicular to the axis of the axial tensioning member 4.

[0062] The axial tensioning member 4 is further provided with a water inlet guide hole 43 between the external thread section 42 and the tensioning hole 41. The water inlet guide hole 43 is a through hole, and its axis is perpendicular to the axis of the tensioning hole 41 and coincides with the central axis of the tool holder 2. The axial tensioning member 4 is coaxially provided with a central water inlet hole, which communicates with the water inlet guide hole 43. One end of the central water inlet hole extends to the end face of the external thread section 42. After the axial tensioning member 4 is connected to the tool 1, cooling water can be introduced into the central water inlet hole through the water inlet guide hole 43, and then guided into the cooling channel inside the tool 1 to cool the tool 1 during operation.

[0063] In this embodiment, as Figure 4 As shown, a cam tensioning mechanism 3 is provided, connected between the tool holder 2 and the axial tensioning member 4. Specifically, the cam tensioning mechanism 3 is a one-piece molded structure, as shown... Figure 9 As shown, it includes an integrally formed locking shaft 31, an eccentric wheel 32 located on the locking shaft 31, a retaining ring 33 located on the locking shaft 31, and a stop protrusion 35.

[0064] like Figure 10 As shown, the locking shaft 31 has a three-section structure, including a head section, an intermediate shaft section, and a mating shaft section. The outer diameter of the head section is larger than the outer diameter of the mating shaft section, and the outer diameter of the mating shaft section is larger than the outer diameter of the intermediate shaft section. Figure 11 As shown, a tool interface 311 is provided on the head section. The tool interface 311 is a standard hexagonal interface that can be used with tools such as wrenches. A retaining ring 33 is coaxially disposed on the head section. The retaining ring 33 has an arc-shaped clearance groove 34. Below the retaining ring 33, there is a stop protrusion 35 that connects to the head.

[0065] like Figure 10 As shown, the eccentric wheel 32 is located on the intermediate shaft section and is cylindrical. Figure 12 As shown, the inner eccentric side of the eccentric wheel 32 is tangent to the outer surface of the locking shaft 31. This tangency refers to the fact that the circle formed by the projection of the eccentric wheel 32 onto the axis of the locking shaft 31 is internally tangent to the circle formed by the projection of the mating shaft segment onto the axis of the locking shaft 31. During machining, a standard milling cutter can be used to form the shape in one pass, eliminating the need for repeated positioning and simplifying the manufacturing process.

[0066] like Figure 4As shown, the locking shaft 31 is inserted into the larger diameter side of the insertion hole 21 on the tool holder 2, passes through the tension hole 41, and is inserted into the smaller diameter part of the insertion hole 21. The locking shaft 31 can rotate within the insertion hole 21. When the locking shaft 31 is inserted into the insertion hole 21, the eccentric wheel 32 is located inside the tension hole 41, and the outer eccentric side of the eccentric wheel 32 contacts the hole wall of the tension hole 41. The insertion hole 21 is provided with a limiting protrusion 22 and a protruding platform 23, which are spaced apart in the axial direction of the insertion hole 21, with the limiting protrusion 22 located on the outer side and the protruding platform 23 located on the inner side. The clearance groove 34 on the retaining ring 33 is used to avoid the limiting protrusion 22, while the limiting protrusion 22 can stop and cooperate with the retaining ring 33 in the axial direction of the insertion hole 21.

[0067] like Figure 6 As shown, the raised platform 23 has a first stop 24 and a second stop 25. The first stop 24 is a stop inclined surface, and the second stop 25 is a stop curved surface. The two sides of the stop protrusion 35 are respectively provided with a mating inclined surface 351 matching the stop inclined surface and a mating curved surface 352 matching the stop curved surface. The anti-reverse groove 26 is located between the first stop 24 and the second stop 25, and is close to the second stop 25. An anti-reverse element 5 is installed in the anti-reverse groove 26. The anti-reverse element 5 is elastic. In this embodiment, the anti-reverse element 5 is a spring cylindrical pin. The elastic cylindrical pin is a standardized part, easy to purchase and replace.

[0068] The limiting protrusion 22, the protruding platform 23, the anti-reverse component 5, the stop protrusion 35, and the retaining ring 33 together form a locking structure, which is used to lock the locking shaft 31 when it is rotated to the correct position. When the stop protrusion 35 engages with the first stop part 24, the locking shaft 31 is in the unlocked position; when the stop protrusion 35 engages with the second stop part 25, the locking shaft 31 is in the locked position.

[0069] The specific method of using the locking structure of the tool 1 of this utility model is as follows:

[0070] First, thread the tool 1 and the axial tensioning member 4 together. Then, align the clearance groove 34 on the retaining ring 33 with the limiting protrusion 22. Insert the locking shaft 31 into the insertion hole 21 and pass through the tensioning hole 41 of the axial tensioning member 4. At this time, the retaining ring 33 passes over the limiting protrusion 22 and is located between the limiting protrusion 22 and the protrusion platform 23, and the eccentric wheel 32 contacts the hole wall of the tensioning hole 41. Then, by inserting a wrench into the tool interface 311 and rotating the locking shaft 31, the axial tensioning member 4 moves along the central axis of the tool holder 2 under the action of the eccentric wheel 32, thereby pulling the tool 1 axially. During the rotation of the locking shaft 31, when the stop protrusion 35 passes over the anti-reverse member 5 and... When the second stop part 25 is engaged, it is tightened to the correct position. At this time, the stop protrusion 35 will not retract under the obstruction of the anti-retraction member 5. At the same time, the tool 1 and the tool holder 2 are stopped in the direction of the central axis of the tool holder 2. The eccentric wheel 32 is still in contact with the hole wall of the tensioning hole 41, and the eccentric wheel 32 is stopped in the direction of the central axis of the tool holder 2 and the axial tensioning member 4. Thus, the movement of the tool 1 is restricted from two directions, and the tool 1 and the tool holder 2 are reliably fixed. Since the locking shaft 31 passes through the axial tensioning member 4 in a direction perpendicular to the central axis of the tool holder 2, there will be no relative rotation between the axial tensioning member 4 and the tool holder 2. Therefore, there will be no relative rotation between the tool 1 and the tool holder 2.

[0071] When the tool 1 is worn out after prolonged use and needs to be disassembled, the operator uses a wrench and tool interface 311 to reverse the locking shaft 31, so that the stop protrusion 35 passes over the anti-reverse member 5 until it rotates to the position of the first stop part 24. During this process, the eccentric wheel 32 rotates together with the locking shaft 31, driving the axial tensioning member 4 to move in the opposite direction, so that the tool 1 is disengaged from the tool holder 2. Then the tool 1 can be unscrewed from the axial tensioning member 4 for replacement.

[0072] Compared with the existing double-ended stud connection method, this utility model can realize the quick assembly and disassembly of the tool 1. When the tool 1 is installed, it will not rotate relative to the tool holder 2 during operation. Moreover, under the tension of the eccentric wheel 32, it is not easy to loosen, which reduces the risk of the tool 1 falling off the tool holder 2, thereby ensuring the machining accuracy of the tool 1, reducing the frequency of assembly and disassembly of the tool 1, and saving machining costs.

[0073] It should be noted that in practice, two sets of cam tensioning mechanisms can be set to simultaneously tension the axial tensioning component. In this case, the tensioning holes on the axial tensioning component are in the form of two coaxially arranged blind holes.

[0074] Embodiment 2 of the tool locking structure provided by this utility model:

[0075] Its main difference from Example 1 is:

[0076] In Example 1, a cam tensioning mechanism 3 is provided, and the tool needs to be tensioned by an axial tensioning member 4.

[0077] In this embodiment, the axial tensioning member 4 is not provided, and two sets of cam tensioning mechanisms 203 are provided. Specifically, as follows... Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the taper shank 2011 of the tool 201 has two coaxially arranged tensioning holes 2012. Both tensioning holes 2012 are blind holes, and two sets of cam tensioning mechanisms 203 correspond one-to-one with the tensioning holes 2012. Each cam tensioning mechanism 203 still includes a locking shaft 2031, an eccentric wheel 2032 located on the locking shaft 2031, a retaining ring and a stop protrusion located on the locking shaft 2031, but the length of the locking shaft 2031 is smaller than that of the locking shaft 31 in the above embodiment 1, and is adapted to the depth of the tensioning hole 2012. In this embodiment, the locking shaft 2031 has a two-section structure, with only a head section and a middle section. The eccentric wheel 2032 is still installed on the middle section, but the end face of the eccentric wheel 2032 is flush with the end face of the locking shaft 2031. It should be noted that the length of the locking shaft 2031 is designed to match the depth of the tensioning hole 2012 and is not specifically limited.

[0078] At this time, the two sides of the insertion hole on the tool holder 202 have the same diameter, and each side of the insertion hole is provided with a limit protrusion, a backlash groove and a protrusion platform.

[0079] During installation, the two locking shafts 2031 need to be inserted into the corresponding tensioning holes 2012 through the two sides of the insertion hole, and the locking shafts 2031 are turned from both sides at the same time. At this time, the two eccentric wheels 2032 drive the cutter 201 to move axially until the cutter 201 is tightened in place.

[0080] This embodiment employs two sets of cam tensioning mechanisms 203 operating synchronously, which provides greater tension force, enhances anti-torsion capability, and improves the stability of the connection between the tool 201 and the tool holder 202. With two sets of cam tensioning mechanisms 203, there is no need to install an axial tensioning member 4, and the size of the locking shaft 2031 is correspondingly reduced.

[0081] Embodiment 3 of the tool locking structure provided by this utility model:

[0082] Its main difference from Example 1 is:

[0083] In Example 1, the eccentric wheel is cylindrical in shape.

[0084] In this embodiment, the eccentric wheel adopts a common cam. At this time, the cam is connected to the middle section of the lock shaft. The eccentric inner side of the cam is located outside the outer surface of the lock shaft and is not tangent to the outer surface of the lock shaft.

[0085] Embodiment 4 of the tool locking structure provided by this utility model:

[0086] Its main difference from Example 1 is:

[0087] In Example 1, the eccentric wheel and the locking shaft are integrally machined.

[0088] In this embodiment, the eccentric wheel and the locking shaft are two parts. The eccentric wheel is fitted onto the locking shaft and the two are welded together.

[0089] Embodiment 5 of the tool locking structure provided by this utility model:

[0090] Its main difference from Example 1 is:

[0091] In Example 1, the retaining ring is stopped by the limiting protrusion, and the locking shaft is fixed by the anti-reverse component to stop the retaining protrusion.

[0092] In this embodiment, an internal thread is machined on the side of the smaller diameter of the insertion hole, and an external thread is machined on the mating section of the lock shaft. The mating section of the lock shaft is threadedly connected to the aforementioned internal thread. The mating section of the lock shaft needs to be tightened because it is threadedly engaged with the side of the smaller diameter of the insertion hole. During the tightening process, the eccentric wheel is rotated, thereby tightening the tool.

[0093] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "inner" and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0094] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tool locking structure, comprising a tool and a tool holder, characterized in that, A cam tensioning mechanism is provided between the cutting tool and the tool holder; The cam tensioning mechanism includes a locking shaft and an eccentric wheel mounted on the locking shaft; An axial tensioning member is provided between the cutting tool and the tool holder. The axial tensioning member is movably assembled inside the tool holder and one end is threaded to the cutting tool. The axial tensioning member is provided with a tensioning hole; or the short tapered shank of the cutting tool is provided with a tensioning hole; the axis of the tensioning hole is perpendicular to the central axis of the tool holder. The locking shaft can rotate relative to the tool holder, and the locking shaft passes through the tool holder and is inserted into the tensioning hole so that the eccentric wheel is located in the tensioning hole. The eccentric outer side of the eccentric wheel contacts the hole wall of the tensioning hole. The eccentric wheel drives the tool to move along its axial direction to tension the tool under the rotation of the locking shaft. A locking structure is provided between the locking shaft and the tool holder to lock the locking shaft in place when it is rotated to the correct position.

2. The tool locking structure according to claim 1, characterized in that, The tool holder is provided with a socket for inserting the locking shaft. The locking structure includes a limiting protrusion and a protruding platform provided in the socket, a stop protrusion and a retaining ring provided on the locking shaft, and a backstop provided on the tool holder. The retaining ring is provided with a relief groove for avoiding the limiting protrusion. The limiting protrusion and the protruding platform are arranged at intervals in the axial direction of the socket so that the retaining ring can be inserted. The raised platform has a first stop and a second stop. The anti-reverse member is elastic and is disposed between the first stop and the second stop. When the anti-reverse protrusion engages with the first stop, the locking shaft is in the unlocked position. When the anti-reverse protrusion passes over the anti-reverse member and engages with the second stop during the rotation of the locking shaft, the locking shaft is in the locked position. The anti-reverse member is used to block the anti-reverse protrusion when it is in the locked position. The limiting protrusion is used to engage with the retaining ring in the axial direction of the insertion hole.

3. The tool locking structure according to claim 2, characterized in that, The first stop portion is a stop inclined surface, and the second stop portion is a stop curved surface; the two sides of the stop protrusion are respectively provided with a mating inclined surface matching the stop inclined surface and a mating inclined surface matching the stop curved surface.

4. The tool locking structure according to claim 2, characterized in that, The anti-reverse component is an elastic cylindrical pin.

5. The tool locking structure according to claim 1, characterized in that, The eccentric wheel and the locking shaft are integrally formed.

6. The tool locking structure according to claim 5, characterized in that, The eccentric wheel is cylindrical.

7. The tool locking structure according to claim 5, characterized in that, The eccentric inner side of the eccentric wheel is tangent to the outer surface of the lock shaft.

8. The tool locking structure according to claim 1, characterized in that, The end of the locking shaft is provided with a tool interface.

9. The tool locking structure according to any one of claims 2-8, characterized in that, An axial tensioning member is provided between the cutting tool and the tool holder, and a cam tensioning mechanism is provided. The tensioning hole is a through hole, and the locking shaft passes through the tensioning hole and is inserted into the insertion hole.

10. The tool locking structure according to any one of claims 2-8, characterized in that, The short taper shank of the cutting tool is provided with two coaxially arranged tensioning holes, which are blind holes, and the cam tensioning mechanism is provided with two.

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