A cam locking structure

Abstract

The utility model relates to tool dismounting technical field, concretely relates to a cam locking structure, including tool head and lock axle, eccentric wheel has on lock axle, the locking groove that tool head has is inserted for eccentric wheel, the maximum size of locking groove in the up and down direction is adapted with the outside diameter of eccentric wheel, the minimum size of locking groove in horizontal direction is greater than the rotating diameter of eccentric wheel, eccentric wheel has the unlocking position of pushing locking groove upside and the locking position of pushing locking groove downside to push out / tighten tool head, through setting locking groove in the connecting section of tool head, when lock axle rotates, tool head can move up and down along with the rotation of eccentric wheel, in the process that eccentric wheel rotates to locking position, eccentric wheel pushes down the second plane of locking groove to make tool head be pulled down, in the process that eccentric wheel rotates to unlocking position, eccentric wheel pushes up the first plane of locking groove to make tool head be pushed up, have realized the installation and dismounting of tool head, improved the operation convenience, can improve work efficiency.

Description

Technical Field

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

[0002] In the field of machining, the tool head and tool holder are often connected by a stud. The two ends of the stud are machined with external threads in opposite directions. The external thread at one end mates with the internal threaded hole on the tool holder, and the external thread at the other end mates with the internal threaded hole on the tool head. By rotating the stud, the tool head and tool holder can be tightened in the axial direction.

[0003] However, in actual use, the threaded connection between the cutter head, cutter shank and double-ended studs is prone to loosening due to uneven force due to the different directions of rotation of the double-ended studs, which in turn leads to a reduction in machining accuracy and efficiency.

[0004] To address the aforementioned issues, existing technologies also employ cam structures for locking the tool head and handle. For example, Chinese patent application CN120287072A discloses a tool locking structure comprising a tool and a handle, with a cam tensioning mechanism between them. 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 tool and the handle, movably fitted within the handle and threaded at one end to the tool. The axial tensioning member has a tensioning hole; alternatively, the short tapered shank of the tool has a tensioning hole. The axis of the tensioning hole coincides with the central axis of the handle and is perpendicular to the axis of the locking shaft. The locking shaft can rotate relative to the handle and passes through the handle, engaging with the tensioning hole so that the eccentric wheel is positioned within the tensioning hole. The outer eccentric side of the eccentric wheel contacts the hole wall. The eccentric wheel, under the rotation of the locking shaft, drives the tool to move axially to tighten it. A locking structure is provided between the locking shaft and the handle.

[0005] The aforementioned tool locking structure locks the tool head 1 onto the tool holder by using an eccentric wheel to tighten the tensioning hole, thus preventing loosening between the tool head 1 and the tool holder. However, it still has certain drawbacks in actual use: such as... Figure 1 and Figure 2 As shown, in order to prevent the eccentric wheel 22 from getting stuck in the tensioning hole, the radial dimension of the tensioning hole 3 is often larger than the diameter of the eccentric wheel 22. When the eccentric wheel 22 is in the locked position, the eccentric outer side of the eccentric wheel 22 can press against the hole wall of the tensioning hole.

[0006] However, when the cutter head needs to be replaced, when the eccentric wheel 22 rotates to the unlocked position, the outer eccentric side of the eccentric wheel 22 just contacts the wall of the tensioning hole 3, which may not be able to lift the cutter head 1, resulting in the cutter head 1 being stuck on the handle and difficult to remove, which brings inconvenience to the replacement of the cutter head 1. Utility Model Content

[0007] This utility model provides a cam locking structure to solve the technical problem that existing cam structures easily cause the cutter head to get stuck on the cutter holder, making replacement inconvenient.

[0008] To solve the above problems, the cam locking structure provided by this utility model adopts the following technical solution: A cam locking structure includes a cutter head and a locking shaft. The central axis of the cutter head extends in the vertical direction. The locking shaft has an eccentric wheel. The cutter head has a locking groove for the eccentric wheel to be inserted into. The maximum dimension of the locking groove in the vertical direction is adapted to the outer diameter of the eccentric wheel. The minimum dimension of the locking groove in the horizontal direction is greater than the rotation diameter of the eccentric wheel. The eccentric wheel has an unlocking position on the upper side of the push-locking groove and a locking position on the lower side of the push-locking groove to push out / tighten the cutter head.

[0009] This utility model discloses a cam locking structure. A locking groove is provided in the connecting section of the cutter head, and the maximum dimensions of the upper and lower surfaces of the locking groove are adapted to the outer diameter of the eccentric wheel. This allows the cutter head to move up and down with the rotation of the eccentric wheel when the locking shaft rotates. During the rotation of the eccentric wheel to the locking position, the eccentric wheel pushes downwards against the second plane of the locking groove to pull the cutter head downwards. During the rotation of the eccentric wheel to the unlocking position, the eccentric wheel pushes upwards against the first plane of the locking groove to push the cutter head upwards. This achieves the installation and removal of the cutter head, avoiding the situation where the cutter head is stuck on the tool holder and difficult to replace, improving operational convenience and work efficiency.

[0010] Furthermore, the locking groove is a horizontally extending rectangular groove, and the middle part of its first plane / second plane has a concave centering arc surface, the radius of which is greater than the rotation radius of the cam.

[0011] Furthermore, the cutting head includes a mounting section for mounting the cutting tool and a connecting section for connecting the cutting tool holder, wherein the outer peripheral surface of the connecting section is a conical surface.

[0012] Furthermore, the locking grooves are located on the connecting section, and there are two of them, with the two locking grooves arranged at 180-degree intervals around the central axis.

[0013] Furthermore, the connection points between the first and second planes of the locking groove and the outer peripheral surface of the connecting section are chamfered to improve the smoothness of the eccentric wheel insertion into the locking groove.

[0014] Furthermore, the taper of the outer circumferential surface of the connecting segment is 1:20.

[0015] Furthermore, the outer surface of the eccentric wheel has a wear-resistant coating to enhance its wear resistance.

[0016] The beneficial effects of the cam locking structure provided by this utility model are: 1. This utility model discloses a cam locking structure by setting a locking groove in the connecting section of the cutter head, and the maximum dimensions of the upper and lower surfaces of the locking groove are adapted to the outer diameter of the eccentric wheel. This allows the cutter head to move up and down with the rotation of the eccentric wheel when the locking shaft rotates. During the process of the eccentric wheel rotating to the locking position, the eccentric wheel pushes downward against the second plane of the locking groove to pull the cutter head downward. During the process of the eccentric wheel rotating to the unlocking position, the eccentric wheel pushes upward against the first plane of the locking groove to push the cutter head upward. This realizes the installation and removal of the cutter head, avoids the situation where the cutter head is stuck on the tool holder and difficult to replace, improves the convenience of operation, and can improve work efficiency.

[0017] 2. By setting an arc-shaped centering surface on the first or second plane of the locking groove, the eccentric wheel can automatically adjust the direction of the cutter head during rotation and limit the rotation of the cutter head relative to the tool holder when the cutter head is working. This improves the integrity and stability of the cutter head and tool holder during locking, which is beneficial to improving the cutting accuracy of the cutter head. In addition, the radius of the centering arc surface is larger than the rotation radius of the cam, which prevents the cam from jamming during rotation and improves the smoothness of the locking shaft rotation.

[0018] 3. By employing a symmetrical arrangement of two locking grooves, the cutter head is subjected to uniform tension during the locking process, preventing tilting or deformation due to uneven force and improving the stability and reliability of the locking structure. This arrangement also helps to enhance the overall strength and rigidity of the structure.

[0019] 4. By applying a wear-resistant coating to the outer surface of the eccentric wheel, the friction and wear between the eccentric wheel and the locking groove during rotation can be effectively resisted, thus extending the service life of the eccentric wheel. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the engagement state between the eccentric wheel and the tensioning hole when the wheel is unlocked. Figure 2 This is a schematic diagram showing the engagement state between the eccentric wheel and the tensioning hole when the eccentric wheel is locked. Figure 3 This is a schematic diagram of a cam locking structure provided by the present invention; Figure 4 for Figure 2 Schematic diagram of the middle cutter head; Figure 5 for Figure 2 Schematic diagram of the middle locking shaft; Figure 6 This is a cross-sectional view of the eccentric wheel in the locked position. Figure 7 This is a cross-sectional view of the eccentric wheel in the unlocked position.

[0021] Explanation of reference numerals in the attached figures: 1. Cutting head; 11. Mounting section; 12. Connecting section; 13. Locking groove; 14. First plane; 15. Second plane; 16. Centering arc surface; 2. Locking shaft; 21. Rotating wheel; 22. Eccentric wheel; 3. Tensioning hole. Detailed Implementation

[0022] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0023] Embodiment 1 of the cam locking structure provided by this utility model: like Figures 3 to 7 As shown, a cam locking structure includes a cutter head 1 and a locking shaft 2. The cutter head 1 includes a mounting section 11 at one end and a connecting section 12 at the other end. The mounting section 11 is used to mount the cutter, and the connecting section 12 is used to connect to the cutter handle. One end of the cutter handle has an insertion hole for the connecting section 12 of the cutter head 1 to be inserted, and the outer wall of the cutter handle has a locking shaft 2 hole for the locking shaft 2 to be inserted. The connecting section 12 has a locking groove 13 for the locking shaft 2 to be inserted vertically. The locking shaft 2 passes through the locking shaft 2 hole and is inserted into the locking groove 13. By rotation, the cutter head 1 is locked and ejected within the cutter handle.

[0024] like Figure 5 As shown, the locking shaft 2 is a camshaft. One end of the locking shaft 2 has a rotating wheel 21 rotatably mounted in the hole of the locking shaft 2, and the other end of the locking shaft 2 has an eccentric wheel 22 fixedly connected to the rotating wheel 21 and eccentrically positioned relative to the rotating wheel 21. The eccentric wheel 22 is used to insert into the locking groove 13. The outer circumferential surface of the eccentric wheel 22 has a wear-resistant coating to effectively resist friction and wear between the eccentric wheel 22 and the locking groove 13 during rotation, thereby extending the service life of the eccentric wheel 22.

[0025] like Figure 3 and Figure 4 As shown, the connecting section 12 is a frustum-shaped structure with a conical outer surface having a taper of 1:20. The central axis of the cutter head 1 is defined as the vertical direction. The locking groove 13 is a horizontally extending rectangular groove. There are two locking grooves 13, arranged at 180-degree intervals around the central axis of the cutter head 1. This ensures that the cutter head 1 receives uniform tension during locking, preventing tilting or deformation due to uneven force, and improving the stability and reliability of the locking structure.

[0026] like Figure 4 , Figure 6 , Figure 7As shown, the upper surface of the locking groove 13 is defined as the first plane 14, and the lower surface of the locking groove 13 is defined as the second plane 15. Each of the second planes 15 has a concave centering arc surface 16 at its center. The radius of the centering arc surface 16 is larger than the rotation radius of the eccentric wheel 22 when the locking shaft 2 rotates, to avoid jamming when the eccentric wheel 22 rotates, thus improving the smoothness of the locking shaft 2's rotation. Furthermore, the distance between the lowest point of the centering arc surface 16 and the first plane 14 matches the diameter of the eccentric wheel 22, allowing the cutter head 1 to move up and down with the rotation of the eccentric wheel 22 when the locking shaft 2 rotates. The eccentric wheel 22 has an unlocking position that pushes against the upper side of the locking groove 13 and a locking position that pushes against the lower side of the locking groove 13 to push out / tighten the cutter head 1. During the rotation of the eccentric wheel 22 to the locking position, the eccentric wheel 22 pushes downward against the second plane 15 of the locking groove 13 to tighten the cutter head 1 downward. During the rotation of the eccentric wheel 22 to the unlocking position, the eccentric wheel 22 pushes upward against the first plane 14 of the locking groove 13 to push the cutter head 1 upward, thereby achieving the tightening and pushing out of the cutter head 1. In addition, the width of the locking groove 13 is greater than the rotation diameter of the eccentric wheel 22 to avoid jamming when the eccentric wheel 22 rotates. The joints between the first plane 14 and the second plane 15 of the locking groove 13 and the outer peripheral surface of the connecting section 12 are all chamfered to improve the smoothness of the eccentric wheel 22 inserting into the locking groove 13.

[0027] The working principle of the cam locking structure provided by this utility model is summarized as follows: This utility model discloses a cam locking structure. A locking groove 13 is provided in the connecting section 12 of the cutter head 1, and the maximum dimensions of the upper and lower surfaces of the locking groove 13 are adapted to the outer diameter of the eccentric wheel 22. This allows the cutter head 1 to move up and down with the rotation of the eccentric wheel 22 when the locking shaft 2 rotates. During the rotation of the eccentric wheel 22 to the locking position, the eccentric wheel 22 pushes downwards against the second plane 15 of the locking groove 13 to pull the cutter head 1 downwards. During the rotation of the eccentric wheel 22 to the unlocking position, the eccentric wheel 22 pushes upwards against the first plane 14 of the locking groove 13 to push the cutter head 1 upwards. This achieves the installation and removal of the cutter head 1, avoiding the situation where the cutter head 1 is stuck on the tool holder and difficult to replace, improving operational convenience and work efficiency.

[0028] Embodiment 2 of the cam locking structure provided by this utility model: Its main difference from Example 1 is: In Example 1, the centering arc surface is located in the middle of the second plane.

[0029] In this embodiment, the centering arc surface is located in the middle of the first plane.

[0030] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships 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 explicitly or implicitly suggest 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 limitations on the present invention.

[0031] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A cam locking structure comprising a tool head and a locking shaft, a center axis of the tool head extending in an up-down direction, characterized in that, The locking shaft has an eccentric wheel, and the cutter head has a locking groove for the eccentric wheel to be inserted. The maximum dimension of the locking groove in the vertical direction is adapted to the outer diameter of the eccentric wheel, and the minimum dimension of the locking groove in the horizontal direction is greater than the rotation diameter of the eccentric wheel. The eccentric wheel has an unlocking position on the upper side of the push-locking groove and a locking position on the lower side of the push-locking groove to push out / tighten the cutter head.

2. The cam lock structure according to claim 1, wherein The locking groove is a horizontally extending rectangular groove. The upper surface of the locking groove is a first plane, and its lower surface is a second plane. The middle part of the first plane / second plane has a concave centering arc surface, and the radius of the centering arc surface is greater than the rotation radius of the cam.

3. A cam locking structure according to any one of claims 1-2, characterized in that, The cutting head includes a mounting section for mounting the cutting tool and a connecting section for connecting the cutting tool holder, wherein the outer peripheral surface of the connecting section is a conical surface.

4. The cam locking structure according to claim 3, characterized in that, The locking grooves are located on the connecting section, and there are two of them. The two locking grooves are arranged at 180-degree intervals around the central axis.

5. The cam lock structure according to claim 4, wherein The first and second planes of the locking groove are chamfered at the connection points with the outer circumference of the connecting section to improve the smoothness of the eccentric wheel insertion into the locking groove.

6. The cam lock structure according to claim 5, wherein The taper of the outer circumference of the connecting section is 1:

20.

7. A cam locking structure according to any one of claims 4-6, characterized in that, The outer surface of the eccentric wheel has a wear-resistant coating to enhance its wear resistance.

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