Cutter bar assembly convenient to disassemble and assemble

Abstract

The utility model provides a cutter bar assembly convenient to disassemble and assemble. The cutter bar assembly comprises a collet chuck and a nut. The collet chuck comprises a base part, a circular groove, a positioning part and a cambered surface, the two sides of the circular groove are adjacent to the base part and the positioning part respectively, and the cambered surface is formed on the periphery of the positioning part in a cutting mode; the nut is hollow and surrounds an inner space, and an inner flange is arranged in the inner space. The inner flange enables the inner space to form an eccentric circle, and the cut cambered surface is designed corresponding to the eccentric distance of the eccentric circle; when the collet chuck and the nut are assembled, the collet chuck is arranged in the inner space surrounded by the nut in a penetrating mode, the inner flange can pass through the cambered surface to enter the annular groove, the situation that the positioning portion of the collet chuck is blocked by the inner flange is avoided, the cambered surface is not prone to being clamped with the inner structure of the nut, and the assembling operation convenience can be improved; and the collet chuck and the nut can be taken down together.

Description

[Technical field]

[0001] The utility model relates to the technical field of knife bars, in particular to a knife bar assembly which is easy to disassemble and operate. [Background technology]

[0002] The existing tool rod generally includes a tool rod body, a collet and a locking nut. Among them, the locking nut is usually provided with an inner flange inside, so that the hollow part forms an eccentric design. When the locking nut is loosened from the tool rod body, the inner flange can simultaneously press against the collet and remove the collet together, thereby increasing the convenience of disassembly.

[0003] However, due to the inner flange, when assembling the collet and the clamping nut, the collet must avoid the inner flange at a specific angle so that it can be assembled to the clamping nut, which is quite difficult to operate. Not only does it require constant adjustment and changing of angles during the assembly process, but the collet is easily stuck by the inner flange or other structures inside the clamping nut, and needs to be pulled apart with great effort, making the assembly operation time-consuming and labor-intensive, and not cost-effective. In view of the above-mentioned problems, the inventor of this case conducted in-depth research on the problem, and thus this case was created. [Contents of the utility model]

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a knife bar assembly that is easy to disassemble.

[0005] The utility model is implemented as follows: a knife bar assembly that is easy to disassemble and operate, comprising:

[0006] A collet, the collet comprising a base, an annular groove, a positioning portion and at least one arc surface, the annular groove is recessed in the outer periphery of the collet, and the two sides of the annular groove are respectively adjacent to the base and the positioning portion, the arc surface is cut and formed on the outer periphery of the positioning portion, the positioning portion can define a tangent line with the vertex of the arc surface, and the tangent line defines a tangent circle partially overlapping with the positioning portion, the radius of the tangent circle is equal to the radius of the positioning portion, and there is an offset distance between the center of the tangent circle and a center point of the positioning portion;

[0007] a nut, wherein the nut is hollow and surrounded by an internal space, and the internal space includes an inner flange, the inner flange is formed on the inner side of the nut, so that the internal space forms an eccentric circle, and there is an eccentric distance between the center of the eccentric circle and the central axis of the nut, and the eccentric distance is substantially equal to the offset distance;

[0008] When the collet is inserted into the internal space, the inner flange can enter the annular groove through the arc surface and be stopped by the positioning portion and clamped in the annular groove.

[0009] Furthermore, the diameter of the eccentric circle is equal to twice the radius of the positioning portion.

[0010] Furthermore, a ratio of a curvature radius of the arc surface to a radius of the positioning portion is between 6.5 and 7.

[0011] Furthermore, the collet includes a plurality of the arc surfaces.

[0012] Furthermore, a plurality of the arc surfaces are arranged and distributed at equal angles.

[0013] Furthermore, the nut is provided with an inner ring conical surface, the positioning portion of the collet has a conical structure, and when the inner flange is clamped in the annular groove, the positioning portion is in contact with the inner ring conical surface of the clamping nut.

[0014] By adopting the technical solution of the utility model, at least the following beneficial effects are achieved:

[0015] 1. By cutting and forming an arc surface on the positioning portion, during assembly, the inner flange can pass through the arc surface to avoid blocking the positioning portion, making it easier for the collet to be inserted into the internal space surrounded by the nut.

[0016] 2. Compared with a flat surface or other concave-convex structures, the arc surface is easier to slide along the arc surface when in contact with the inner structure of the nut, thereby reducing the occurrence of the collet and the nut getting stuck and needing to be pulled apart.

[0017] 3. The arc surface formed by cutting can define an offset distance with the tangent line and the tangent circle. By designing that the offset distance is substantially equal to the eccentric distance of the eccentric circle formed by the inner flange of the nut, the adaptability of the positioning portion of the collet and the nut can be improved, and the influence of processing errors can be reduced, thereby ensuring that the produced collet and nut can be assembled smoothly.

[0018] In summary, the technical solution of the utility model can significantly improve the convenience and efficiency of assembling the collet and the nut.

Brief Description of the Drawings

[0019] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional appearance diagram of the first preferred embodiment of the utility model;

[0021] Figure 2 It is an exploded view of the first preferred embodiment of the utility model;

[0022] Figure 3 It is an exploded view of another perspective of the first preferred embodiment of the utility model;

[0023] Figure 4 It is a side cross-sectional view of the first preferred embodiment of the utility model;

[0024] Figure 5 It is a cross-sectional view of the positioning portion of the collet in the first preferred embodiment of the utility model;

[0025] Figure 6 It is a cross-sectional view of a nut of a first preferred embodiment of the utility model;

[0026] Figure 7 This is one of the operation diagrams of the first preferred embodiment of the utility model;

[0027] Figure 8 This is the second operation diagram of the first preferred embodiment of the utility model;

[0028] Fig. 9 This is the third operation diagram of the first preferred embodiment of the utility model;

[0029] Fig.10 This is a three-dimensional appearance diagram of the first preferred embodiment of the utility model installed on a knife bar body;

[0030] Fig.11 It is a three-dimensional cross-sectional view of the second preferred embodiment of the utility model installed on a tool bar body and installing a tool;

[0031] Fig.12 It is an exploded view of the third preferred embodiment of the utility model installed on a knife bar body.

[0032] Description of reference numerals:

[0033] 10, 10A: Collet

[0034] 11: Base

[0035] 12: Tool mounting hole

[0036] 13: Ring groove

[0037] 14: Positioning unit

[0038] 141:Curved surface

[0039] 15: Grooving

[0040] 20, 20A: Nut

[0041] 200:Center axis

[0042] 201: Center

[0043] 21: Interior Space

[0044] 22: Inner flange

[0045] 23: Inner cone

[0046] 30: Tool holder body

[0047] 40: Knife

[0048] C1: Center point

[0049] C2: Center of the circle

[0050] R1: Radius

[0051] R2: Radius

[0052] Rc: Radius of curvature

[0053] S1: Offset distance

[0054] S2: Eccentric distance

[0055] t: tangent

[0056] T: Tangent circle

[0057] Φ: diameter. [Specific implementation method]

[0058] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0059] It should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing these embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. In addition, the terms "first", "second", etc., etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0060] like Figures 1 to 3 As shown, the utility model is a first preferred embodiment of a tool bar assembly that is easy to disassemble and operate, the tool bar assembly includes a collet 10 and a nut 20, the collet 10 and the nut 20 can be assembled together and installed on a tool bar body of a tool bar to assemble a tool bar, wherein the collet 10 is used to install a tool, and the nut 20 is used to fix the collet 10 and the tool to the tool bar body.

[0061] like Figures 2 to 4As shown, the collet 10 includes a base 11, an annular groove 13, a positioning portion 14 and three arc surfaces 141. The base 11, the annular groove 13 and the positioning portion 14 are arranged in sequence along a length direction of the collet 10, and the two sides of the annular groove 13 are adjacent to the base 11 and the positioning portion 14 respectively. The base 11 is used to be inserted into a knife rod body, and the annular groove 13 and the positioning portion 14 can prevent the collet 10 and the nut 20 from being easily separated after the two are assembled.

[0062] In the first preferred embodiment of the present invention, the collet 10 is a high rigidity collet and does not include any grooves. In addition, one side of the positioning portion 14 is adjacent to the annular groove 13, and the other side of the positioning portion 14 extends to form a tubular structure, and a tool mounting hole 12 is formed in the tubular structure. Figure 4 As shown, the tool mounting hole 12 is provided with an internal thread for mounting a tool. In other embodiments, the tool mounting hole 12 can also be used to mount a tool in other existing ways, and is not limited to the internal thread mentioned above.

[0063] like Figure 2 , Figure 3 and Figure 5 As shown, each of the arc surfaces 141 is formed by cutting on the outer periphery of the positioning portion 14. The cutting means that during the processing, the outer periphery of the workpiece is removed to form the arc surface 141. Figure 5 As shown, the positioning portion 14 has a radius R1, and the arc surface 141 has a curvature radius Rc, and the curvature radius Rc of the arc surface 141 is greater than the radius R1 of the positioning portion 14. Specifically, after the workpiece is processed to preliminarily form the shape of the positioning portion 14, the workpiece is further subjected to a material removal operation, wherein the material removal operation defines a material removal radius, and the material removal radius is equal to the curvature radius Rc of the arc surface 141. The arc line formed by the material removal radius passes through the workpiece, and the workpiece is cut along the arc line formed by the material removal radius to form the arc surface 141 with the curvature radius Rc.

[0064] like Figures 2 to 4 and Figure 6 As shown, the nut 20 is hollow and surrounded by an internal space 21, and the internal space 21 includes an inner flange 22, and the inner flange 22 is protruded toward the internal space 21, so that an eccentric circle is formed in the internal space 21. Figure 6 As shown, the nut 20 has a central axis 200 , and the eccentric circle formed by the inner flange 22 has a diameter Φ and a center 201 . An eccentric distance S2 is formed between the center 201 and the central axis 200 .

[0065] like Figure 2 and Figure 3As shown, in the first preferred embodiment of the utility model, the nut 20 is a UM-type nut having a plurality of spaced grooves, which can be screwed by a UM-type wrench having a plurality of corresponding hooks, so as to screw the nut 20 onto the arbor body of the arbor.

[0066] The positioning portion 14 of the collet 10 and the arc surface 141 formed by cutting are designed to correspond to the relevant dimensions of the nut 20. Figure 5 and Figure 6 As shown, the positioning portion 14 of the collet 10 can be cut into a tangent line t with the vertex of the arc surface 141, and further define a tangent circle T with the tangent line t, wherein the radius R2 of the tangent circle T is equal to the radius R1 of the positioning portion 14, and there is an offset distance S1 between the center C2 of the tangent circle T and the center point C1 of the positioning portion 14, and the offset distance S1 is the radial dimension reduced by cutting to form the arc surface 141. The offset distance S1 is equal to the eccentric distance S2 of the eccentric circle formed in the internal space 21 of the nut 20.

[0067] The design of the inner flange 22 of the nut 20 and the annular groove 13, the positioning portion 14 and the arc surface 141 of the collet 10 can improve the convenience of the assembly operation of the collet 10 and the nut 20, as described in detail as follows:

[0068] When a knife bar needs to be assembled, the collet 10 and the nut 20 are assembled together. Figure 7 As shown, first, the collet 10 is inserted into the internal space 21 surrounded by the nut 20. When inserting, the angle of the collet 10 is slightly adjusted so that the axial direction of the collet 10 is inclined relative to the axial direction of the nut 20, and the positioning portion 14 is directed toward the inner flange 22 with the arc surface 141, that is, the inner flange 22 can pass smoothly through the arc surface 141.

[0069] like Figure 7 and Figure 8 As shown in FIG. 1 , after passing through the arc surface 141, the inner flange 22 enters the annular groove 13, so that the collet 10 can be smoothly inserted into the internal space 21. At this time, the angle of the collet 10 can be adjusted to realign the axial direction of the collet 10 with the axial direction of the nut 20. Then, as shown in FIG. Fig. 9 As shown, the collet 10 is rotated around the aligned axial direction so that the positioning portion 14 faces the inner flange 22 with the portion other than the arc surface 141, so that the assembly can be successfully completed; at this time, the inner flange 22 is stopped by the positioning portion 14 and clamped in the annular groove 13, and the collet 10 and the nut 20 are not easy to separate from each other.

[0070] Finally, if Fig.10 As shown, the assembled collet 10 and the nut 20 can be installed on a tool rod body 30, and the nut 20 is screwed on the tool rod body 30 to fix the collet 10 to the tool rod body 30, so that the assembly of the tool rod can be completed. The tool rod can be installed with a tool through the tool mounting hole 12 of the collet 10, and the tool rod and the tool are installed on the spindle of a machine tool with the tool rod body 30 to realize the processing operation; and when the tool rod is to be disassembled, since the inner flange 22 is clamped in the annular groove 13 of the collet 10, when the nut 20 is loosened from the tool rod body 30, the inner flange 22 abuts against the positioning portion 14, so that the collet 10 can be removed together with the nut 20, which is convenient for disassembly.

[0071] By adopting the above technical solution of the utility model, at least the following beneficial effects are achieved:

[0072] 1. By cutting and forming the arc surface 141 on the positioning portion 14, during assembly, the inner flange 22 can pass through the arc surface 141 to avoid blocking the positioning portion 14, making it easier for the collet 10 to penetrate into the internal space 21 surrounded by the nut 20.

[0073] 2. Compared with the plane and concave-convex structure, when the arc surface 141 contacts the inner structure of the nut 20, it is easy to slide along the arc surface 141, so that the inner structure of the collet 10 and the nut 20 are less likely to get stuck, which can reduce the occurrence of the collet 10 and the nut 20 getting stuck and needing to be pulled apart.

[0074] 3. The arc surface formed on the positioning portion 14 can define the offset distance S1 with the tangent line t and the tangent circle T. By designing that the offset distance S1 is substantially equal to the eccentric distance S2 of the eccentric circle formed by the nut 20 in the internal space 21, the compatibility of the positioning portion 14 of the collet 10 and the nut 20 can be improved, and the influence of processing errors can be reduced, so that the produced collet 10 and nut 20 can be smoothly assembled.

[0075] From the above, it can be seen that the technical solution of the utility model can significantly improve the operational convenience and assembly efficiency of the collet 10 and the nut 20 compared to the existing tool rods, and is combined with the inner flange 22, the annular groove 13 and the positioning portion 14 that are easy to disassemble, thereby providing a tool rod assembly that is easy to disassemble.

[0076] Furthermore, the diameter Φ of the eccentric circle is equal to twice the radius R1 of the positioning portion 14, and the offset distance S1 is substantially equal to the eccentric distance S2, so that the size design of the positioning portion 14 of the collet 10 and the nut 20 are more consistent, and the influence of the processing error can be further reduced, so that the produced collet 10 can be smoothly inserted into the internal space 21 surrounded by the produced nut 20 for assembly.

[0077] Going further, Figure 5 As shown, the ratio of the radius of curvature Rc of the arc surface 141 to the radius R1 of the positioning portion 14 is between 6.5 and 7 (6.5≤Rc / R1≤7). With an appropriate radius of curvature Rc, the arc surface 141 can have an appropriate curvature, which can make the collet 10 less likely to get stuck with the inner structure of the nut 20 as mentioned above, and the processing of forming the arc surface 141 is relatively easy. For example, in a specific embodiment, the radius of curvature Rc of the arc surface 141 is 110 mm, and the radius R1 of the positioning portion 14 is 16.375 mm.

[0078] Preferably, if Figures 2 to 4 As shown, in the first preferred embodiment of the utility model, the nut 20 is provided with an inner ring cone surface 23, and the positioning portion 14 of the collet 10 has a conical structure. After the inner flange 22 enters the annular groove 13 through the arc surface 141 and is clamped in the annular groove 13, the positioning portion 14 with a conical structure can be abutted against the inner ring cone surface 23 of the nut 20, making it more difficult for the collet 10 and the nut 20 to separate from each other, thereby improving the stability of the installation.

[0079] In the first preferred embodiment of the present invention, the collet 10 includes three arc surfaces 141, and in other embodiments, the number of the arc surfaces 141 can be determined according to actual needs and is not limited to the first preferred embodiment of the present invention; and in the preferred embodiment of the present invention, three arc surfaces 141 are used, so that when the angle of the collet 10 is adjusted before penetrating the internal space 21, any one of the arc surfaces 141 can be directed toward the inner flange 22, and the inner flange 22 can pass through the arc surface 141 to avoid blocking the positioning portion 14, which can further improve the convenience of operation.

[0080] Even better, if Figure 5 As shown, the three arc surfaces 141 are arranged at equal angles so that there is a certain distance between two adjacent arc surfaces 141. As mentioned above, any one of the arc surfaces 141 can be directed toward the inner flange 22, and the problem of the inner flange 22 being easily separated from the annular groove 13 due to the arc surface 141 can also be avoided.

[0081] like Fig.11 As shown, the second preferred embodiment of the utility model is a knife bar assembly that is easy to disassemble and operate. The difference between the second preferred embodiment of the utility model and the first preferred embodiment of the utility model is that the knife bar assembly adopts another form of collet 10A. Compared with the collet 10 of the first preferred embodiment of the utility model, which adopts a high-rigidity collet, the collet 10A of the second preferred embodiment of the utility model adopts an elastic collet, which has a plurality of grooves 15, so that the collet 10A has a little elasticity and can be deformed by force to tighten the tool. The mounting hole of the collet 10A for mounting a tool 40 extends directly from the positioning portion 14 toward the base 11.

[0082] like Fig.12 As shown, the third preferred embodiment of the utility model is a knife bar assembly that is easy to disassemble and operate. The difference between the first and second preferred embodiments of the utility model is that the knife bar assembly adopts another form of nut 20A. Compared with the nut 20 of the first and second preferred embodiments of the utility model, which adopts a UM-type nut, the nut 20A of the third preferred embodiment of the utility model adopts an A-type nut, that is, a hexagonal nut, which can be screwed by a corresponding A-type wrench; in addition, the third preferred embodiment of the utility model can adopt any one of the collets 10 and 10A of the first and second preferred embodiments of the utility model.

[0083] In the second and third preferred embodiments of the utility model, the collet 10, 10A also has the annular groove 13, the positioning portion 14 and the arc surface 141 cut and formed on the positioning portion 14, and the nut 20, 20A also has the inner flange 22, so as to improve the convenience of assembly and disassembly. The technical solution of the utility model can be applied to different types of collets 10, 10A, different forms of nuts 20, 20A, and can be installed on different forms of tool bar bodies 30, and is not limited to specific forms of collets, nuts and tool bar bodies.

[0084] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A knife bar assembly that is easy to disassemble, characterized in that: include: A collet, the collet comprising a base, an annular groove, a positioning portion and at least one arc surface, the annular groove is recessed in the outer periphery of the collet, and the two sides of the annular groove are respectively adjacent to the base and the positioning portion, the arc surface is cut and formed on the outer periphery of the positioning portion, the positioning portion can define a tangent line with the vertex of the arc surface, and the tangent line defines a tangent circle partially overlapping with the positioning portion, the radius of the tangent circle is equal to the radius of the positioning portion, and there is an offset distance between the center of the tangent circle and a center point of the positioning portion; a nut, wherein the nut is hollow and surrounded by an internal space, and the internal space includes an inner flange, the inner flange is formed on the inner side of the nut, so that the internal space forms an eccentric circle, and there is an eccentric distance between the center of the eccentric circle and the central axis of the nut, and the eccentric distance is equal to the offset distance; When the collet is inserted into the internal space, the inner flange can enter the annular groove through the arc surface and be stopped by the positioning portion and clamped in the annular groove.

2. A knife bar assembly that is easy to disassemble as claimed in claim 1, characterized in that: The diameter of the eccentric circle is equal to twice the radius of the positioning portion.

3. A knife bar assembly that is easy to disassemble as claimed in claim 1 or 2, characterized in that: The ratio of a curvature radius of the arc surface to a radius of the positioning portion is between 6.5 and 7.

4. A knife bar assembly that is easy to disassemble as claimed in claim 3, characterized in that: The collet comprises a plurality of arc surfaces.

5. A knife bar assembly that is easy to disassemble as claimed in claim 4, characterized in that: A plurality of the arc surfaces are arranged and distributed at equal angles.

6. A knife bar assembly that is easy to disassemble as claimed in claim 1 or 2, characterized in that: The nut is provided with an inner ring conical surface, the positioning portion of the collet has a conical structure, and when the inner flange is clamped in the annular groove, the positioning portion is in contact with the inner ring conical surface of the nut.

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