Driven CR tensioning cutter handle

Abstract

The driven CR tensioning knife handle comprises a knife handle body, a gland, an extension rod, a driven shaft body, a driving wheel, a first bearing and a second bearing, the driven shaft body is rotatably installed in a hollow cavity through the first bearing and the second bearing, the bottom of the driven shaft body is open and is arranged in an inward concave mode, and a connecting bolt is arranged in the middle of the inner end face of the driven shaft body. An inner thread is arranged on the inner wall of a through hole of the extension rod, the tail portion of the extension rod penetrates through the axial channel to enable the inner thread to be in threaded connection with the connecting bolt, a turbine tooth portion is arranged on the outer wall of the middle of the driven shaft body, and a worm tooth portion of the driving wheel is meshed with the turbine tooth portion of the driven shaft body after the driving wheel penetrates through a side hole in the cutter handle body. And the driven shaft body can be driven to rotate synchronously by rotating the nut part of the driving wheel, so that the extension rod is contracted and tensioned inwards. According to the utility model, rotating force can be effectively converted into tensioning force for pulling the extension rod through a worm mechanism, so that ultra-precise clamping is realized, and the requirement on high precision in CNC (Computer Numerical Control) machining is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting tool holder technical field, more specifically, relate to a driven CR tension tool holder. BACKGROUND

[0002] CNC machining is through computer programming to control the movement of machine tools, widely used in aerospace, automobile manufacturing, die manufacturing, medical devices, electronic products and other industries, common CNC equipment has CNC cutting machine or CNC milling machine etc. Tool holder is the mechanical spindle and tool and other accessories tool connecting piece, the traditional tool holder may face vibration, inaccurate positioning and rapid wear under the condition of high speed rotation and complex processing, usually the manufacturing precision is lower and lacks high-precision adjustment mechanism, it is difficult to realize the accurate alignment between tool and workpiece, thereby affecting the machining precision and surface quality. SUMMARY

[0003] The utility model discloses a driven CR tension tool holder that overcomes the above-mentioned defects in the prior art, ensures the stability and machining precision of the tool, has higher flexibility and adaptability, and can realize ultra-precision clamping.

[0004] To achieve the above object, the utility model provides a driven CR tension tool holder, including tool holder body, gland, extension rod, driven shaft body, driving wheel, first bearing and second bearing, the one end of tool holder body is opened and is recessed with inner chamber to the inside, the upper end opening of gland is fixed cover and is located at the opening position of inner chamber, the hollow cavity is formed between tool holder body and gland, the upper and lower ends of driven shaft body are rotatably installed in hollow cavity through first bearing and second bearing, the lower end middle part of gland is provided with the axial channel that communicates its upper end opening, the bottom opening of driven shaft body is recessed to the inside and is provided with connecting bolt in its inner end surface middle part, the through hole that the extension rod is set up with the tool installation is set up along its length direction, the inner thread of the tail inner wall of through hole is provided with, the inner thread of connecting bolt is screwed with the tail inner wall of through hole after the extension rod tail passes through the axial channel and the bottom opening of driven shaft body, the middle part outer wall of driven shaft body is provided with turbine tooth part, the worm gear tooth part of driving wheel is engaged with the turbine tooth part of driven shaft body after driving wheel passes through the lateral opening on the outer wall of tool holder body, the nut part of driving wheel is rotatably inserted in the lateral opening of tool holder body, the nut part of driving wheel can drive driven shaft body synchronous rotation by rotating, to realize the extension rod inwards contraction tension.

[0005] As preferred, the first bearing and the second bearing are respectively provided as a first roller group and a second roller group, the first roller group and the second roller group are respectively composed of a plurality of rollers, and the rollers are provided as spherical balls or cylindrical balls.

[0006] As preferred, the inner wall of the inner cavity of the shank body is provided with a first annular limiting part, and the first roller group is movably arranged between the top surface of the turbine tooth part of the driven shaft body and the first annular limiting part

[0007] As preferred, the bottom outer side wall of the driven shaft body is outwardly provided with an annular eave, the top inner end surface of the gland is concavely provided with a second annular limiting part, and the second roller group is movably arranged between the annular eave and the second annular limiting part.

[0008] As preferred, the first sealing ring and the second sealing ring are further included, the first annular installation groove is formed on the top outer wall surface of the driven shaft body, the first sealing ring is sleeved on the first annular installation groove, the second annular installation groove is concavely formed on the top inner end surface of the gland, and the second sealing ring is embedded in the second annular installation groove and located on the bottom surface of the driven shaft body.

[0009] As preferred, the third sealing ring is further included, and the third sealing ring is embedded in the third annular installation groove in the inner wall of the side opening of the shank body.

[0010] As preferred, the extension rod is arranged as a CR type extension rod.

[0011] As preferred, the structural upper part of the extension rod is arranged as a conical circular truncated cone and is transitioned to the rod body structure of the lower part at the middle position.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The utility model discloses simple, novel, reasonable in design, adopt the worm and gear structure and the threaded connection of extension rod and driven shaft body, and the driven shaft body can be driven by the worm mechanism of driving wheel, can effectively convert the rotating force into the tension of extension rod, guarantees the stability of cutting tool and the machining precision, in addition, extension rod can adapt to different types of cutting tools, especially in the processing environment of complex or narrow space, has higher flexibility and adaptability, thereby realizes super-precision clamping, satisfies the requirement of high precision in CNC machining. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating laboriously.

[0015] Figure 1 It is a structure schematic view of driven CR tension shank provided by the utility model embodiment;

[0016] Figure 2 is a cross section schematic view of the driven CR tensioning knife handle provided by the embodiment of the present application;

[0017] Figure 3 is an explosion schematic view of the driven CR tensioning knife handle provided by the embodiment of the present application;

[0018] Figure 4 is a partial structure explosion schematic view of the driven CR tensioning knife handle provided by the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] Please refer to Figure 1 The embodiments of the present application provide a driven CR tensioning knife handle, which comprises a knife handle body 1, a gland 2, an extension rod 3, a driven shaft body 4, a driving wheel 5, a first bearing 6 and a second bearing 7 and the like components. The various components of the present embodiment will be described in detail below in combination with the drawings.

[0021] As shown in Figure 1 and Figure 2 , one end of the knife handle body 1 can be open and recessed inwardly with an inner cavity 10, the upper end of the gland 2 is open and fixedly capped at the opening position of the inner cavity 10, the hollow cavity 20 is formed between the knife handle body 1 and the gland 2, the upper and lower ends of the driven shaft body 4 are rotatably installed in the hollow cavity 20 through the first bearing 6 and the second bearing 7, the lower end of the gland 2 is provided with an axial passage 21 which is communicated with the upper end opening, the bottom of the driven shaft body 4 is open and recessed inwardly and provided with a connecting bolt 41 at the middle of the inner end face, the extension rod 3 is provided with a through hole 31 for installing a tool along the length direction thereof, the tail inner wall of the through hole 31 is provided with an internal screw thread 32, and the internal screw thread 32 of the extension rod 3 is threadedly connected with the connecting bolt 41 after the tail of the extension rod 3 passes through the axial passage 21 and the bottom opening of the driven shaft body 4.

[0022] The shank body 1 is a modern digital machine output structure, which is more rigid and stable in torque transmission. The hollow cavity 20 formed between the shank body 1 and the gland 2 provides reliable rotating support for the driven shaft body 4. Through the precise bearing cooperation of the first bearing 6 and the second bearing 7, the stability and accuracy during rotation are ensured, and the friction and vibration are reduced. At the same time, the gland 2 and the driven shaft body 4 are connected to provide installation space for the extension rod 3. The tight thread connection can be locked with high torque, and the extension rod 3 can be better fixed and connected.

[0023] Specifically, the middle outer wall of the driven shaft body 4 can be provided with a turbine tooth portion 42. After the driving wheel 5 passes through the side opening 11 on the outer wall of the shank body 1, the worm gear tooth portion 51 of the driving wheel 5 is engaged with the turbine tooth portion 42 of the driven shaft body 4. The nut portion 52 of the driving wheel 5 is rotatably inserted into the side opening 11 of the shank body 1. The driving wheel 5 drives the driven shaft body 4 through the worm mechanism, which can effectively convert the rotating force into the tensioning force for pulling the extension rod 3.

[0024] The driven shaft body 4 and the driving wheel 5 are manufactured by high-precision process, which requires precise grinding and strict precision to ensure the matching precision of the components. The worm has the characteristics of force amplification, which can produce greater tensioning force under lower rotating torque, ensuring its accuracy.

[0025] In this embodiment, the nut portion 52 of the driving wheel 5 preferably adopts a hexagonal nut, which can withstand higher torque. The specific implementation can be selected as needed, and this embodiment does not limit it.

[0026] In specific implementation, the operator rotates the nut portion 52 of the driving wheel 5 by using a hexagonal wrench. Since the worm gear tooth portion 51 of the driving wheel 5 is engaged with the turbine tooth portion 42 of the driven shaft body 4, the driving wheel 5 can drive the driven shaft body 4 to rotate synchronously when rotating, thereby realizing the inward contraction and tensioning of the extension rod 3.

[0027] Preferably, the extension rod 3 can be set as a CR type extension rod, which originally belongs to the Japanese industrial structure MST. The CR type extension rod can adapt to different types of tools and processing needs, especially in complex or narrow space processing environment, providing greater flexibility and adaptability.

[0028] Preferably, the upper part of the extension rod 3 can be set as a conical circular truncated cone and transitioned to the lower rod structure at the middle position.

[0029] As shown in Figure 3 The first bearing 6 and the second bearing 7 can be set as a first roller group and a second roller group, respectively. The first roller group and the second roller group are respectively composed of a plurality of rollers, which are set as spherical balls or cylindrical balls.

[0030] The inner wall of the inner cavity 10 of the tool shank body 1 can be convexly provided with a first annular limiting portion 12, and the first roller group is movably arranged between the top surface of the turbine tooth portion 42 of the driven shaft body 4 and the first annular limiting portion 12.

[0031] Preferably, the bottom outer side wall of the driven shaft body 4 can be outwardly convexly provided with an annular eave 43, the top inner end surface of the gland 2 is recessed with a second annular limiting portion 22, and the second roller group is movably arranged between the annular eave 43 and the second annular limiting portion 22.

[0032] As shown in Figure 4 , the first annular installation groove 44 can be further arranged on the top outer wall surface of the driven shaft body 4, the first sealing ring 81 is sleeved on the first annular installation groove 44, the top inner end surface of the gland 2 is recessed with a second annular installation groove 23, and the second sealing ring 82 is embedded in the second annular installation groove 23 and located on the bottom surface of the driven shaft body 4.

[0033] Further, the third sealing ring 83 can be further included, and the third sealing ring 83 is embedded in the third annular installation groove 13 in the inner wall of the side opening 11 of the tool shank body 1.

[0034] Specifically, the first sealing ring 81, the second sealing ring 82 and the third sealing ring 83 can effectively prevent dust, moisture and other external substances from entering the hollow inner cavity 20, so as to protect the components such as the driven shaft body 4 and the driving wheel 5 in the hollow inner cavity 20, and can improve the stability of the extension rod 3 during use, reduce vibration and influence, and improve machining precision.

[0035] In summary, the utility model discloses a turbine worm structure and the threaded connection of the extension rod and the driven shaft body, and the driving wheel drives the driven shaft body through the worm mechanism, so that the rotating force can be effectively converted into the tension of the extension rod, the stability of the tool is guaranteed, and the machining precision is guaranteed, in addition, the extension rod can adapt to different types of tools, especially in the machining environment of complex or narrow space, has higher flexibility and adaptability, thereby realizing super-precision clamping, and meeting the requirement of high precision in CNC machining.

[0036] The above embodiment is a preferred embodiment of the utility model, but the embodiment of the utility model is not limited by the above embodiment, and any change, modification, replacement, combination and simplification without departing from the spirit and principle of the utility model should be equivalent replacement, and all fall within the protection scope of the utility model.

Claims

1. A driven CR tensioning tool holder, characterized in that: The tool holder includes a handle body (1), a pressure cap (2), an extension rod (3), a driven shaft (4), a drive wheel (5), a first bearing (6), and a second bearing (7). One end of the handle body (1) is open and recessed into an inner cavity (10). The upper end of the pressure cap (2) is open and fixedly covers the opening of the inner cavity (10). A hollow cavity (20) is formed between the handle body (1) and the pressure cap (2). The upper and lower ends of the driven shaft (4) are rotatably mounted in the hollow cavity (20) through the first bearing (6) and the second bearing (7). An axial channel (21) connecting the lower end of the pressure cap (2) to its upper end opening is provided in the middle. The bottom of the driven shaft (4) is open and recessed into the middle, and a connecting bolt (41) is provided in the middle of its inner end face. The extension rod (3) has a section along its length. A through hole (31) for mounting the cutting tool is provided with an internal thread (32) on the inner wall of the tail of the through hole (31). After the tail of the extension rod (3) passes through the axial channel (21) and the bottom opening of the driven shaft (4), its internal thread (32) is threadedly connected to the connecting bolt (41). The outer wall of the middle part of the driven shaft (4) is surrounded by a worm gear (42). After the driving wheel (5) passes through the side opening (11) on the outer wall of the tool holder body (1), its worm gear (51) meshes with the worm gear (42) of the driven shaft (4). The nut part (52) of the driving wheel (5) is rotatably inserted into the side opening (11) of the tool holder body (1). By rotating the nut part (52) of the driving wheel (5), the driven shaft (4) can be driven to rotate synchronously, thereby realizing the inward retraction and tightening of the extension rod (3).

2. The driven CR tensioning tool holder according to claim 1, characterized in that: The first bearing (6) and the second bearing (7) are respectively configured as a first roller group and a second roller group, and the first roller group and the second roller group are each composed of a number of rollers, and the rollers are configured as spherical balls or cylindrical balls.

3. The driven CR tensioning tool holder according to claim 2, characterized in that: The inner wall of the inner cavity (10) of the tool holder body (1) is provided with a first annular limiting part (12), and the first roller group is movably disposed between the top surface of the turbine tooth (42) of the driven shaft body (4) and the first annular limiting part (12).

4. A driven CR tensioning tool holder according to claim 2, characterized in that: The driven shaft (4) has an annular convex eave (43) protruding outward on the bottom outer side wall, and the top inner end face of the pressure cover (2) has a second annular limiting part (22) recessed. The second roller group is movably disposed between the annular convex eave (43) and the second annular limiting part (22).

5. A driven CR tensioning tool holder according to claim 1, characterized in that: It also includes a first sealing ring (81) and a second sealing ring (82). A first annular mounting groove (44) is provided on the top outer wall of the driven shaft (4). The first sealing ring (81) is fitted on the first annular mounting groove (44). A second annular mounting groove (23) is recessed on the top inner end face of the pressure cap (2). The second sealing ring (82) is embedded in the second annular mounting groove (23) and located on the bottom surface of the driven shaft (4).

6. The driven CR tensioning tool holder according to claim 1, characterized in that: It also includes a third sealing ring (83), which is embedded in the third annular mounting groove (13) on the inner wall of the side opening (11) of the handle body (1).

7. A driven CR tensioning tool holder according to claim 1, characterized in that: The extension rod (3) is configured as a CR type extension rod.

8. A driven CR tensioning tool holder according to claim 1, characterized in that: The upper part of the extension rod (3) is set in a cone-shaped frustum and transitions to the lower rod structure in the middle position.

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