Novel shaft core pull rod tensioning device

Abstract

The utility model discloses a novel shaft core pull rod tensioning device which comprises a shaft core, an inner hole is formed in the shaft core, a pull rod is installed in the inner hole in a sliding mode, a first step is arranged on the rear side of the pull rod, a belleville spring abuts against the first step, a spring seat is installed at one end of the belleville spring, and a second step is arranged on the rear side of the inner hole. The front side of the pull rod is in threaded connection with a pull rod nut and a chuck, a clamping opening is formed in the end, away from the pull rod, of the chuck, a cutter is clamped at the clamping opening, the outer surface of the end, close to the clamping opening, of the chuck is of a first conical surface structure inclining outwards, and the first conical surface structure is attached to the inner wall of the inner hole. According to the cutter clamping device, the cutter is clamped under the elastic action of the belleville spring, the initial pre-tightening force of the belleville spring can generate backward thrust on the pull rod and the chuck, and the outer wall of the chuck can extrude the inner wall of the shaft core, so that the inner diameter of the clamping opening of the chuck is shrunk, the clamping force on the cutter is generated, and the cutter can be tightly fixed on the chuck.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric spindle technical field, concretely relates to a novel shaft core pull rod tension device. BACKGROUND

[0002] Numerical control machine tool is a kind of automatic machine tool equipped with program control system, and its main function is to carry out cutting processing to workpiece, changes its shape, size and surface quality etc., and electric spindle as the key functional component of numerical control machine tool, plays a decisive role to the performance and processing quality of numerical control machine tool.Electric spindle usually needs to install suitable tool, such as milling cutter, drill bit, boring cutter etc.Electric spindle drives tool high-speed rotation, realizes the cutting processing to workpiece material by relative motion with workpiece, but the clamping force requirement of the tool of existing electric spindle is very high, too tight will lead to tool cannot be normally put into chuck, too loose again easily leads to tool not clamped and separates, and the shaft core pull rod of the prior art is difficult to meet the clamping demand of tool. SUMMARY

[0003] The utility model discloses to the prior art's insufficient, provide a novel shaft core pull rod tension device to solve the problem in the background art.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] A novel shaft core pull rod tension device, including shaft core, the inner hole is slidably installed with pull rod, the rear side of the pull rod is provided with first step, the first step is abutted with butterfly spring, one end of the butterfly spring is installed with spring seat, the rear side of the inner hole is provided with second step, the spring seat is closely combined with the second step, the front side of the pull rod is threadedly connected with pull rod nut and chuck, the end away from pull rod of the chuck is provided with the mouth of the clip, the tool is clamped at the mouth of the clip, the tool protrudes from the inner hole, the outer surface of the end close to the mouth of the chuck is the first taper surface structure that inclines outward, and the first taper surface structure is combined with the inner wall of the inner hole.

[0006] As a preferred scheme of novel shaft core pull rod tension device, the rear side of the pull rod is provided with wear-resistant ring, and the wear-resistant ring is in contact with the inner wall of the inner hole.

[0007] As a preferred scheme of novel shaft core pull rod tension device, the second step is third taper surface structure, one side of the spring seat close to the second step is fourth taper surface structure, the third taper surface structure is closely combined with the fourth taper surface structure, and one side of the spring seat close to the butterfly spring is plane structure.

[0008] As a preferred scheme of the new type axle core pull rod tension device, the front side of the inner hole is provided with a third step, the front side of the pull rod protrudes from the third step and is provided with an external thread, the pull rod nut can be threadedly connected with the pull rod, and the outer diameter of the pull rod nut is greater than the inner diameter of the third step, so that the pull rod nut can abut against the third step.

[0009] As a preferred scheme of the new type axle core pull rod tension device, one end of the chuck is provided with a connecting hole, the connecting hole is provided with an internal thread and can be threadedly connected with one end of the pull rod, and the clamping opening is arranged at the end of the chuck away from the connecting hole and has a cylindrical structure.

[0010] As a preferred scheme of the new type axle core pull rod tension device, the inner surface of the front side of the inner hole is a second outwardly inclined conical surface structure, and the first conical surface structure is attached to the second conical surface structure.

[0011] As a preferred scheme of the new type axle core pull rod tension device, the chuck is made of elastic material.

[0012] The new type axle core pull rod tension device has the following beneficial effects:

[0013] The utility model discloses a structure design of butterfly spring, and the utility model discloses a clamping cutter by the elastic force of butterfly spring, the initial pre -tightening force of butterfly spring can produce the thrust to the pull rod, and the other end of pull rod is connected with chuck, and chuck will be driven by pull rod and move back, in this process, the first conical surface structure of chuck outer wall will be extruded with the inner wall of axle core inner hole, makes the clamping opening inner diameter of chuck contract, thereby produces the clamping force of cutter, guarantees that cutter can be fixed tightly on chuck, compared with the form that butterfly spring is installed on the outside of axle core, the butterfly spring of the utility model discloses is installed directly in the inner hole of axle core, and butterfly spring can directly contact with pull rod, need not pass through other components conduction, and the thrust is more direct and accurate, and the clamping force is also more accurate. ACCURACY

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the drawings needed to be used in the embodiment of the utility model simple introduction. Obviously, the following described drawings only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0015] Fig. 1 It is the whole structure schematic diagram of the new type axle core pull rod tension device described in the utility model.

[0016] Fig. 2 It is the structure schematic diagram of the axle core described in the utility model.

[0017] Fig. 3 is a structural schematic view of the pull rod.

[0018] Fig. 4 is a structural schematic view of the chuck.

[0019] In the drawing:

[0020] 1, shaft core; 11, inner hole; 12, second step; 13, third step; 14, second taper structure; 2, pull rod; 21, first step; 3, butterfly spring; 4, spring seat; 5, pull rod nut; 6, chuck; 61, clamping opening; 62, first taper structure; 63, connecting hole; 7, cutter; 8, wear ring. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model will be further illustrated below in combination with the drawings and through specific embodiments.

[0022] Among them, the drawing is only used for example explanation, and the representation is only a schematic view, not a real object drawing, and cannot be understood as a limitation on the patent; in order to better illustrate the embodiment of the utility model, some components of the drawing will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawing can be omitted.

[0023] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not to indicate or imply that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, the positional relationship described in the drawing is only used for example explanation, and cannot be understood as a limitation on the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0024] In the description of the utility model, unless otherwise explicitly specified and limited, if the connection relationship between the components appears, the term should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0025] As Figs. 1 to 4The utility model provides a novel shaft core pull rod tension device, including the shaft core 1, the shaft core 1 is set up the inner hole 11 along its length direction, the inner hole 11 is slidably installed with pull rod 2, the rear side of pull rod 2 is provided with first step 21, and the first step 21 is provided with the butterfly spring 3, and one end of butterfly spring 3 is installed with spring seat 4, the rear side of inner hole 11 is provided with second step 12, and spring seat 4 is closely combined with second step 12, and the front side of pull rod 2 is threadedly connected with pull rod nut 5 and chuck 6, and the end away from pull rod 2 of chuck 6 is provided with the mouth 61 of clamping, and the mouth 61 of clamping is clamped with tool 7, and tool 7 protrudes in the inner hole 11, the chuck 6 of this embodiment preferably adopts elastic material, and the clamping force of tool 7 can be adjusted,

[0026] The butterfly spring 3 of this embodiment is initially set to compressed state, so that the butterfly spring 3 has initial pre-tightening force, and the initial pre-tightening force of the butterfly spring 3 will generate a backward thrust on the pull rod 2 through the first step 21, and the chuck 6 on the front side of the pull rod 2 will also move backward in the process of moving backward, and since the outer surface of the end close to the mouth 61 of the chuck 6 is a first taper surface structure 62 inclined outward, the first taper surface structure 62 is combined with the inner wall of the inner hole 11, and since the outer diameter of the first taper surface structure 62 gradually expands outward, when the first taper surface structure 62 moves backward under the action of the pull rod 2, the inner wall of the inner hole 11 will extrude the first taper surface structure 62, forcing the mouth 61 of the chuck 6 to gradually compress inward, thereby producing the clamping force of the tool 7, so as to ensure that the tool 7 is tightly fixed on the chuck 6.

[0027] Compared with the form that the butterfly spring 3 is installed outside the shaft core 1, the butterfly spring 3 of this embodiment is directly installed in the inner hole 11 of the shaft core 1, and the butterfly spring 3 can directly contact with the pull rod 2 without the need of being conducted through other components, so that the thrust is more direct and accurate, and the clamping force is also more accurate.

[0028] At the same time, since the pull rod 2 of this embodiment is located in the inner hole 11 of the shaft core 1, in order to avoid the possibility of mutual abrasion between the shaft core 1 and the pull rod 2, the wear-resistant ring 8 is sleeved on the rear side of the pull rod 2 in this embodiment, and the wear-resistant ring 8 is in contact with the inner wall of the inner hole 11, thereby reducing the friction between the pull rod 2 and the shaft core 1.

[0029] Preferably, the second step 12 of this embodiment is preferably provided as a third taper surface structure, and the side close to the second step 12 of the spring seat 4 is preferably provided as a fourth taper surface structure, the third taper surface structure is closely combined with the fourth taper surface structure, and the setting of the third taper surface structure and the fourth taper surface structure can increase the contact area of the spring seat 4 and the second step 12 as much as possible in a limited position, thereby providing more stable support force for the spring seat 4, and the side close to the butterfly spring 3 of the spring seat 4 is a plane structure, which can be combined with the butterfly spring 3.

[0030] Specifically, the front side of the inner hole 11 of the embodiment is provided with a third step 13, the front side of the pull rod 2 protrudes from the third step 13 and is provided with external threads, the pull rod 2 can be screwed with the pull rod nut 5 through the external threads, and meanwhile, the outer diameter of the pull rod nut 5 of the embodiment is greater than the inner diameter of the third step 13. When the pull rod 2 moves backward to a certain position under the elastic force of the butterfly spring 3, the pull rod nut 5 will abut against the third step 13, thereby limiting the pull rod 2.

[0031] More specifically, one end of the chuck 6 of the embodiment is provided with a connecting hole 63, the connecting hole 63 is provided with internal threads, the connecting hole 63 can be screwed with one end of the pull rod 2 through the internal threads, and the chuck opening 61 is arranged at the end of the chuck 6 away from the connecting hole 63, and the chuck opening 61 is a cylindrical structure and can clamp the tool 7.

[0032] Preferably, in order to facilitate the installation of the chuck 6, the inner surface of the front side of the inner hole 11 of the embodiment is also a second tapered surface structure 14 that inclines outward, the first tapered surface structure 62 is in close contact with the second tapered surface structure 14, thereby facilitating the installation of the chuck 6 on the pull rod 2, and the second tapered surface structure 14 can guide the chuck 6 to move backward.

[0033] It should be noted that the above specific embodiments only serve as the preferred embodiments of the utility model and the applied technical principles. Those skilled in the art should understand that various modifications, equivalent replacements, changes and the like can be made to the utility model. However, as long as these changes do not deviate from the spirit of the utility model, they should be within the protection scope of the utility model. In addition, some terms used in the specification and claims of the present application are not limited, but are only used for convenient description.

Claims

1. A new type of axle core drawbar tensioning device, characterized in that, The utility model provides a kind of tool holder, including shaft core (1), the inner hole (11) of the shaft core (1) is opened along its length direction, pull rod (2) is slidably installed in the inner hole (11), the rear side of the pull rod (2) is provided with first step (21), the first step (21) is abutted with butterfly spring (3), one end of the butterfly spring (3) is installed with spring seat (4), the rear side of the inner hole (11) is provided with second step (12), the spring seat (4) is closely combined with the second step (12), the front side of the pull rod (2) is threadedly connected with pull rod nut (5) and chuck (6), the end of the chuck (6) away from pull rod (2) is provided with clamping opening (61), the clamping opening (61) is clamped with tool (7), the tool (7) protrudes from the inner hole (11), the outer surface of the chuck (6) close to clamping opening (61) one end is the first taper surface structure (62) of outwardly inclined, the first taper surface structure (62) is combined with the inner wall of the inner hole (11).

2. The new kingpin rod tensioning device of claim 1, wherein, The rear side of the pull rod (2) is provided with a wear-resistant ring (8), and the wear-resistant ring (8) is in contact with the inner wall of the inner hole (11).

3. The new kingpin rod tensioner device of claim 1, wherein, The second step (12) is a third taper surface structure, one side of the spring seat (4) close to the second step (12) is a fourth taper surface structure, the third taper surface structure is closely combined with the fourth taper surface structure, and one side of the spring seat (4) close to the butterfly spring (3) is a plane structure.

4. The new kingpin tie rod jack-up device of claim 1, wherein, The front side of the inner hole (11) is provided with a third step (13), the front side of the pull rod (2) protrudes from the third step (13) and is provided with external threads, which can be threadedly connected with the pull rod nut (5), and the outer diameter of the pull rod nut (5) is greater than the inner diameter of the third step (13), so that the pull rod nut (5) can abut against the third step (13).

5. The new kingpin tie rod jack-up device of claim 1, wherein, One end of the chuck (6) is provided with a connecting hole (63), and the connecting hole (63) is provided with internal threads, which can be threadedly connected with one end of the pull rod (2), the clamping opening (61) is provided at the end of the chuck (6) away from the connecting hole (63), and the clamping opening (61) is a cylindrical structure.

6. The new kingpin tie rod jack-up device of claim 1, wherein, The inner surface of the front side of the inner hole (11) is a second taper surface structure (14) inclined outwardly, and the first taper surface structure (62) is combined with the second taper surface structure (14).

7. The new kingpin tie rod jack-up device of claim 1, wherein, The chuck (6) is made of elastic material.

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