CN218168899U

CN218168899U - Rotation stopping structure of broach mechanism, electric spindle and machine tool

Info

Publication number: CN218168899U
Application number: CN202222175025.8U
Authority: CN
Inventors: 韦鸿昌; 程振涛; 汤丽君; 汤秀清; 雷群; 汤智峰; 黄腾晖
Original assignee: Guangzhou Haozhi Electromechanical Co Ltd
Current assignee: Guangzhou Haozhi Electromechanical Co Ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-12-30
Anticipated expiration: 2032-08-17

Abstract

The utility model discloses a broach mechanism's structure, electric main shaft and lathe of splining, include: the shaft core is provided with a shaft core inner hole which extends from the near end to the far end along the axis direction; the pull rod assembly is arranged in the inner hole of the shaft core and comprises a pull rod and a spring, the spring extends along the axis direction and is used for providing an acting force for resetting the pull rod, one end of the spring abuts against the pull rod, and the other end of the spring abuts against the shaft core; the shaft end gland is connected to the near end of the shaft core and is provided with a through hole; the pull rod is provided with a pull rod neck which penetrates through the through hole and extends outwards, the pull rod neck is provided with a first floating guide groove which extends along the axis direction, the shaft end gland is provided with a first ball mounting hole in the hole wall of the through hole, a first ball is arranged in the first ball mounting hole, and the first ball partially protrudes out of the first ball mounting hole and is embedded into the first floating guide groove. The problems of wear, clamping stagnation and dynamic balance change of a broach mechanism and reduction of broach force caused by structural problems are solved.

Description

Rotation stopping structure of broach mechanism, electric spindle and machine tool

Technical Field

The utility model is used for electric main shaft field especially relates to a structure, electric main shaft and lathe are only changeed to broach mechanism.

Background

At present, traditional electricity main shaft often uses the dish spring as broach mechanism's pine, the broach elastomer, and because the dimensional tolerance that dish spring itself exists, during high-speed operation, dish spring centrifugal expansion, hole and pull rod fit clearance grow, eccentricity appears, when forging a knife, the dislocation appears in the dish spring, dish spring hole and pull rod tight fit, and the dish spring receives when compressing along the certain angular rotation of axis, eccentric dish spring sharp limit and pull rod friction, lead to the pull rod wearing and tearing, the life-span subtracts the weak point, the unbalance amount grow. When the cutter is operated for a certain number of times, the disc spring is broken, the vibration seriously exceeds the standard, and even the main shaft loses the cutter pulling force. Because of the problems of the disc spring, the spring tends to be used as a loose and broaching elastic body of the electric spindle broaching mechanism. When the spring broach mechanism rotates at a high speed, the centrifugal expansion eliminates the fit clearance, the unbalance is reduced, the whole structure is stable, and the vibration is smaller. The spring knife beating has no dislocation or eccentricity, reduces the abrasion of the knife changing and prolongs the service life. However, in the process of unloading the broach, the pressure applied to the top of the pull rod by the broach unloading mechanism drives the spring to press down, and the spring generates a torsion force in a spiral direction in the process of pressing down, so that the broach mechanism rotates relatively in the shaft core to drive the shaft core to rotate. The rotation of the spring broach mechanism relative to the shaft core causes problems such as increased load and vibration variation, and therefore, the rotation prevention process is required.

The structure of splines among the prior art mainly uses gear shaping, bolt as the owner, and the spline gear shaping of splines promptly is first location structure, and the pull rod elongated slot is second location structure, second location structure and first location structure clearance fit, gear shaping and chute face and face contact, and this kind of structure has following defect:

(1) Is easy to wear

(1) The gear shaping is mainly based on sliding along the motion of a slotted hole, the gear shaping mainly occurs on a matching position, two part surfaces are in surface contact, when a friction pair slides relatively, due to the fact that a node formed by an adhesion effect is sheared and broken, sheared materials fall off to form abrasive dust, or one surface moves to the other surface, friction loss occurs, sliding friction damages the surfaces of the parts, dust accumulation is impacted, and a piston is blocked, so that a cutter unloading mechanism is difficult to beat and even is blocked, and when the abrasive dust enters a rear bearing, the bearing is blocked.

(2) Tooth damage always occurs at a right angle to the tooth and when two objects are in contact, there is always local contact because the contact surfaces are not parallel, at which point even with a small applied load, the local stress on the actual contact surfaces is sufficient to cause plastic deformation, causing stress wear.

(2) Reduce the tool-pulling force of the main shaft

When the broach mechanism unloads a cutter, the elastic body is pressed downwards to generate torsional force in a spiral direction, when the broach mechanism is in a non-cutter state, the elastic body recovers to the original state to generate torsional force in the opposite direction, the rotation stopping piece gear shaping is under the action of symmetrical cyclic stress, parts generate fatigue damage, the gear shaping is damaged or broken, the sharp gear shaping further enables the pull rod matching groove to be damaged, the clamping stagnation is generated when the broach mechanism moves up and down due to the defect, impact dust caused by abrasion of the rotation stopping piece during impact enters an inner hole of the shaft core, the friction force is large, the clamping stagnation of the broach mechanism is further increased, and the broach force is reduced.

(3) Increasing the risk of seizure

The rotation stopping piece and the pull rod are high in hardness and are hard to touch during movement, the hard touch result is that parts are abraded or broken, under the action of symmetrical cyclic stress, the gear shaping is interfered with the pull rod when damaged, the broach mechanism cannot move up and down, a main shaft cannot pull a broach, and the main shaft fails. When the gear shaping wearing and tearing are too half, vibration directionality changes, and the dust that produces when the gear shaping destroys accumulates, has aggravated dead risk of card.

(4) Complicated structure and difficult processing

The gear shaping of the rotation stopping piece needs to increase the requirements of circular arc, fillet and deburring in the process of processing design due to the consideration of stress action, the feed time is longer in processing, the symmetry degree of the gear shaping is difficult to guarantee, when the symmetry degree is unqualified, the matching position is more easy to wear and damage, the gear shaping structure needs high hardness, and the heat treatment process is complex.

(5) Unstable detent effect

Theoretically, the broach mechanism, the rotation stopping piece and the shaft core are kept relatively static under the action of the broach unloading mechanism, but in actual motion, due to the fact that the gear shaping rotation stopping structure has the risks, deflection of the shaft core is still not completely inhibited, the deflection angle of the shaft core is further increased along with increase of the number of times of cutting, follow-up rotation of the shaft core enables a spindle provided with a precision encoder to generate corresponding torsion moment when corresponding current is given through a spindle motor, deflection of the shaft core is corrected, and overload is caused, so that overcurrent alarm of a machine tool is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a broach mechanism's the structure of splining, electric main shaft and lathe, solve because of structural problem's broach mechanism wearing and tearing, jamming, dynamic balance change, the condition that broach power reduces.

The utility model provides a technical scheme that its technical problem adopted is:

in a first aspect, a rotation stopping structure of a broach mechanism includes:

the shaft core is provided with a shaft core inner hole which extends from the near end to the far end along the axis direction;

the pull rod assembly is arranged in the inner hole of the shaft core and comprises a pull rod and a spring, the spring extends along the axis direction and is used for providing an acting force for resetting the pull rod, one end of the spring abuts against the pull rod, and the other end of the spring abuts against the shaft core;

the shaft end gland is connected to the near end of the shaft core and is provided with a through hole;

the pull rod is provided with a pull rod neck which penetrates through the through hole and extends outwards, the pull rod neck is provided with a first floating guide groove which extends along the axis direction, the shaft end gland is arranged on the hole wall of the through hole and is provided with a first ball mounting hole, a first ball is arranged in the first ball mounting hole, and the first ball partially protrudes out of the first ball mounting hole and is embedded into the first floating guide groove.

In a second aspect, a rotation stopping structure of a broach mechanism includes:

the pull rod assembly is arranged in the inner hole of the shaft core and comprises a pull rod and a spring, the spring extends along the axis direction, the spring is used for providing acting force for resetting the pull rod, one end of the spring abuts against the pull rod, and the other end of the spring abuts against the shaft core;

the pull rod is provided with a pull rod neck which penetrates through the through hole and extends outwards, a second ball mounting hole is formed in the pull rod neck, a second ball is arranged in the second ball mounting hole, a shaft end gland is arranged on the hole wall of the through hole and provided with a second floating guide groove extending along the axis direction, and the second ball partially protrudes out of the second ball mounting hole and is embedded into the second floating guide groove.

In a third aspect, a rotation stopping structure of a broach mechanism includes:

the shaft end gland is connected to the near end of the shaft core and provided with a through hole, a rotation stopping component is embedded in the through hole, and the rotation stopping component is provided with a rotation stopping inner hole;

the pull rod is provided with a pull rod neck which penetrates through the rotation stopping inner hole and extends outwards, the pull rod neck is provided with a third floating guide groove which extends along the axis direction, the rotation stopping component is arranged on the hole wall of the rotation stopping inner hole and is provided with a third ball mounting hole, a third ball is arranged in the third ball mounting hole, and the third ball partially protrudes out of the third ball mounting hole and is embedded into the third floating guide groove.

With reference to the third aspect, in certain implementations of the third aspect, the rotation stopping component is provided with a plurality of third ball mounting holes uniformly distributed along a circumferential direction of the rotation stopping inner hole, the neck portion of the pull rod is provided with a plurality of third floating guide grooves corresponding to the third ball mounting holes, and a torsion force is transmitted between the corresponding third ball mounting holes and the third floating guide grooves through third balls.

With reference to the third aspect and the foregoing implementation manners, in certain implementation manners of the third aspect, the cross section of the third floating guide groove is circular arc-shaped, square-shaped or triangular.

With reference to the third aspect and the foregoing implementation manners, in some implementation manners of the third aspect, the third ball mounting hole penetrates through the rotation preventing member in the radial direction of the shaft core, one side of the third ball abuts against a hole wall of the through hole, and the other side of the third ball is fitted into the third floating guide groove.

With reference to the third aspect and the foregoing implementation manners, in some implementation manners of the third aspect, a limit boss is disposed at an inner side of the shaft end gland at a proximal end of the pull rod, a groove is disposed on a tail end face of the limit boss, the spring is sleeved in the pull rod, one end of the spring abuts against the limit boss, a protrusion clamped into the groove is disposed on an end face of the spring abutting against the limit boss, the other end of the spring abuts against the shaft core through a support sleeve, and the spring has a flat end face matched with the support sleeve.

With reference to the third aspect and the foregoing implementation manners, in certain implementation manners of the third aspect, the spring is a flocked double-wound spring.

In a fourth aspect, an electric spindle includes the rotation stopping structure of the broach mechanism according to any one of the above implementation manners.

In a fifth aspect, a machine tool comprises an electric spindle according to any one of the above implementations.

One of the above technical solutions has at least one of the following advantages or beneficial effects: the technical scheme of the utility model abandon the scheme of splines among the prior art, realize the spring in the transmission of the torsional force of unloading the sword process through unsteady guide slot and ball between axle head gland and the pull rod, it has avoided gear shaping wearing and tearing, the fracture problem under the cyclic stress effect, has solved the axle center and has rotated the problem, and the technical scheme's the effect of splines is more excellent, and the advantage is more obvious.

1. The utility model discloses a ball can realize contacting with pull rod floating guide slot point and point to roll and replace the slip, realize the low friction. Meanwhile, the ball is compact in interior and high in fine granularity, impact toughness is enhanced, the ball is low in breakage rate and large in shearing force, and fatigue fracture and impact dust cannot be generated when the part is impacted for a long time. Meanwhile, according to the design concept of point-to-point contact, low friction is realized in a sliding mode, and the interchangeability of parts is further improved.

2. The utility model provides a pull rod, the design has the ball passageway on it, for "ball bearing" inner circle raceway ", the ball rolls on its" inner circle raceway ", and rolling mode has reduced the frictional force of in-process, has improved the transmission efficiency of mechanical power, and because of the rolling circulation passageway is fixed, theoretical life is not worn and torn more than a million.

3. And the balls are standardized parts, so that the hardness is high, heat treatment is not needed, the time consumption for machining the gear shaping is not long, the qualified rate is low, the machining time is saved, and the cost is saved.

4. The shaft end gland, the ball mounting hole and the floating guide groove are combined by the slotted holes to form a ball circulation channel, which is equivalent to the rotation of the ball bearing ball on a fixed track, thereby not only preventing the risks of clamping stagnation and locking, but also improving the transmission efficiency. Meanwhile, the structure is simple and reliable in design, low in manufacturing cost and easy to popularize and apply.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a structural sectional view of an embodiment of a rotation stopping structure of a broach mechanism according to the present invention;

FIG. 2 is an exploded view of the structure of one embodiment shown in FIG. 1;

FIG. 3 is a schematic view of the spring structure of one embodiment shown in FIG. 1;

FIG. 4 is a schematic view of the tie bar structure of one embodiment shown in FIG. 1;

FIG. 5 is a schematic view of the rotation stop member of FIG. 1 in accordance with one embodiment;

FIGS. 6-7 are schematic structural views of two other embodiments of the anti-rotation member of the present invention;

fig. 8-9 are schematic structural views of two other floating guide grooves according to the present invention.

Detailed Description

This section will describe in detail the embodiments of the present invention, the preferred embodiments of which are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can visually and vividly understand each technical feature and the whole technical solution of the present invention, but it cannot be understood as a limitation to the scope of the present invention.

In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for convenience of description of the technical solution of the present invention, and it does not indicate or suggest that the indicated technical features must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present invention.

In the utility model, the meaning of "several" is one or more, the meaning of "a plurality of" is more than two, "greater than", "less than", "exceed" and so on are understood as not including the number; "above", "below", "within" and the like are understood to include the present numbers. In the description of the present invention, if there is any description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise explicitly defined, the terms "set", "install", "connect", and the like are to be understood in a broad sense, and for example, may be directly connected or may be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either internal to the two elements or in an interactive relationship of the two elements. The technical field can reasonably determine the specific meaning of the words in the utility model by combining the specific content of the technical scheme.

Referring to fig. 1 and 2, an embodiment of the present invention provides a rotation stopping structure of a broach mechanism, including a spindle 100, a pull rod assembly, and a spindle end cover 200.

The shaft core 100 is provided with a shaft core inner hole 101 extending from the near end to the far end along the axis direction, the pull rod assembly is arranged in the shaft core inner hole 101 and comprises a pull rod 301 and a spring 302, the spring 302 extends along the axis direction, the spring 302 is used for providing acting force for resetting the pull rod 301, one end of the spring 302 abuts against the pull rod 301, and the other end of the spring 302 abuts against the shaft core 100.

The shaft end gland 200 is connected to the near end of the shaft core 100, the shaft end gland 200 and the shaft core 100 can be connected in a threaded connection mode, an interference mode, a welding mode, a pin joint fit mode and the like, the shaft end gland 200 is provided with a through hole 201, a rotation stopping component 202 is embedded in the through hole 201, and the rotation stopping component 202 is provided with a rotation stopping inner hole 203.

The pull rod 301 is provided with a pull rod neck 303 which penetrates through the rotation stopping inner hole 203 and extends outwards, the pull rod neck 303 is provided with a third floating guide groove 304 which extends along the axial direction, the rotation stopping component 202 is provided with a third ball mounting hole 204 on the hole wall of the rotation stopping inner hole 203, a third ball 205 is arranged in the third ball mounting hole 204, and part of the third ball 205 protrudes out of the third ball mounting hole 204 and is embedded into the third floating guide groove 304.

When the spindle moves downwards to compress the spring 302 or the pull rod 301 moves upwards to release the spring 302 in the process of tool unloading or tool pulling, the spring 302 rotates due to compression stress, under the combined action of the external force F and the resilience force of the spring 302, the surface of the tool unloading mechanism 400 in contact with the pull rod 301 generates friction force, the friction force is not enough to prevent torsion force, namely deflection cannot be completely inhibited, at the moment, the ball and the limit action of the pull rod 301 intervene in work, so that the tool unloading mechanism and the pull rod 301 form a whole, and the spring 302 and the pull rod 301 also form a fixed whole. The pull rod 301 moves downwards, the third ball 205 rolls up and down along with the third floating guide groove 304, the shaft end gland 200, the third ball mounting hole 204 and the third floating guide groove 304 are combined together by the grooves to form a ball circulation channel, which is equivalent to the ball bearing rotating on a fixed track, the track limits the rotating angle and direction, the relative position is fixed, the force value when the cutter removing mechanism presses down is far greater than the rotating force of the cutter pulling mechanism, a part of torsional force is removed in the rolling process, and at the moment, the spring 302, the pull rod 301 and the shaft core 100 are relatively static, so that the deflection of the shaft core 100 is restrained.

The utility model discloses cancelled the cartridge structure, old structure gear shaping slides with pull rod 301 face promptly, replaces the gear shaping with the ball, has solved cartridge structure wearing and tearing, cracked problem, and ball and pull rod 301 point and point contact have reduced frictional force, have also improved the life of splining the structure simultaneously. Compared with the prior flat boss structure, the structure has the advantages that the positioning and rotation preventing effects are more effectively realized, and the strength and the wear resistance of the product are better. And the processing of cartridge structure gear shaping is more of a specified duration, and the symmetry qualification rate is difficult to guarantee, and simultaneously, the ball is the standard part, has saved the processing cost, and the qualification rate superelevation.

The embodiment of the utility model provides an innovative proposition is as the structure that splines with the ball, axle head gland 200 is "bearing inner race", the part 202 that splines is "holder", the guide slot that floats is "inner circle raceway", the ball is at fixed "raceway" motion, the motion is single and reliable, and rolling mode has reduced the frictional force of in-process, the transmission efficiency of mechanical power has been improved, because of the rolling circulation passageway is fixed, the structure that splines of "bearing" formula has very high fatigue limit intensity and life-span, through above-mentioned simple structure, the stable structural scheme that splines of stable performance, guaranteed that main shaft axle core 100 subassembly can not deflect along with main shaft tool changing in-process.

The structure design of the rotation stopping part 202 is simple, the position is compact, the structure is symmetrical, redundant unbalance amount cannot be added to the shaft core 100, the ball mounting hole of the rotation stopping part 202 is skillfully designed with a ball hole, a fixed roller path is provided for the ball, the risk of clamping under the action of gravity and the action of cutter unloading force cannot exist, the structure is more complex, the unreliability is correspondingly increased, the design of the rotation stopping part 202 cannot generate dust generated by part abrasion during impact, the bearing is also a potential protection, and the service life of the main shaft is prolonged.

In some embodiments, referring to fig. 1 and 2, the rotation stopping member 202 is provided with a plurality of uniformly distributed third ball mounting holes 204 along the circumferential direction of the rotation stopping inner hole 203, the draw rod neck 303 is provided with a plurality of third floating guide grooves 304 corresponding to the third ball mounting holes 204, and the third ball 205 is used for transmitting the torsional force between the corresponding third ball mounting holes 204 and the corresponding third floating guide grooves 304. The layout has compact structure and more balanced shafting mass distribution, and is beneficial to improving the high-speed dynamic characteristics of the shafting.

Referring to fig. 4, 8 and 9, the third floating guide groove 304 has a circular arc shape, a square shape or a triangular shape in cross section.

Referring to fig. 5-7, the rotation stopping component 202 may be designed in a shape of a circle, a square, a diamond, etc., the shaft end cover 200 is designed with a screw hole matching with the rotation stopping component 202 and a mounting groove 206 of the rotation stopping component 202, the front surface of the rotation stopping component 202 is designed with a through hole for screw connection, and the rotation stopping component 202 is embedded in the mounting groove 206 and locked by a screw 207.

Further, the third ball mounting hole 204 penetrates the rotation stop member 202 in the radial direction of the shaft core 100, one side of the third ball 205 abuts against the hole wall of the through hole 201, and the other side of the third ball 205 is fitted into the third floating guide groove 304, so that the rotation stop structure forms a bearing type structure. The rotation stopping component 202 is a retainer, the floating guide groove is an inner ring raceway, the balls move in the fixed raceway, the movement mode is single and reliable, the friction force in the process is reduced by the rolling mode, the transmission efficiency of mechanical power is improved, and the bearing type rotation stopping structure has high fatigue limit strength and long service life due to the fact that the rolling circulation channel is fixed.

In some embodiments, referring to fig. 1, 3, and 4, a limit boss 305 is disposed at a proximal end of the pull rod 301 inside the shaft end cover 200, a groove 306 is disposed at a tail end face of the limit boss 305, the spring 302 is sleeved on the pull rod 301, one end of the spring 302 abuts against the limit boss 305, a protrusion 307 which is clamped into the groove 306 is disposed at an end face of the spring 302 which abuts against the limit boss 305, the other end of the spring 302 abuts against the shaft core 100 through a support sleeve 308, and the spring 302 has a flat end face which is matched with the support sleeve.

Wherein, the spring 302 adopts a flocking double-winding spring. The surface of the material is planted with villi which has strong toughness and is extremely difficult to drop, and the material has strong self-lubricating effect. When the main shaft is designed, the inner hole of the assembly of the shaft core 100 is designed to have a proper clearance with the outer diameter of the flocked double-wound spring, when the main shaft runs at a high speed, the centrifugal expansion eliminates the fit clearance, the outer diameter surface of the double-wound spring is attached to the hole wall of the inner hole of the assembly of the shaft core 100, and in addition, the double-wound spring is in a specific flocking structure, so that the attachment is tighter, and the double-wound spring has the functions of self-centering and self-positioning. Thus, the double-wound spring no longer acts like a disc spring, and the whip is limited using the pull rod 301 as a positioning. Meanwhile, the outer diameter of the large end of the pull rod 301 and the outer diameter of the small end of the pull rod 301 are designed to have a small clearance with the inner hole of the pressing sleeve of the shaft core 100 assembly, so that the positioning error of the pull rod 301 and the shaft core 100 assembly is ensured to be extremely small. Therefore, the inner hole of the shaft core 100 assembly is used as a reference, four-point positioning consisting of the outer diameter of the large end of the pull rod 301, the outer diameter of the whole body after being flocked by the double-wound spring, the outer diameter of the small end of the pull rod 301 and the pull claw assembly of the sliding core is realized, and the stability is extremely high, so that the whole broach mechanism and the shaft core 100 assembly are on the same axis, and the broach loosening process along with the main shaft can not cause relative change of relevant parts of the broach mechanism. When the double-winding spring is designed, the bending deformation resistance of the pull rod 301 is enhanced under the condition of ensuring the force of the spring 302 and the ultra-long service life, so that the vibration stability of the main shaft is better, and the vibration controllability of the main shaft is greatly improved.

The embodiment of the utility model discloses a on the basis of above-mentioned structure, the protruding corresponding recess 306 of embedding pull rod 301 of two winds spring makes both fixed to assemble the gasket in two after the spring plane end back-loading supporting sleeve is fixed to assemble to axle core 100 subassembly together, lock axle head gland 200 to axle core 100 subassembly through threaded connection. After the balls are arranged in the ball mounting holes of the rotation stopping component 202, the rotation stopping component 202 is locked into the shaft end gland 200 along the floating guide groove (the balls are attached to the floating guide groove) of the pull rod 301 through a screw, then the pull rod 301 nut is arranged, and finally the pull claw is arranged at the other end of the shaft core 100 assembly to form the complete main shaft broach mechanism.

In some embodiments, the ball mounting holes in the anti-rotation members 202 can be moved down on the shaft end cover 200, either separately or in one piece, which simplifies the anti-rotation structure and improves the machining efficiency. In other words, the embodiment of the present invention provides a rotation stopping structure of a broach mechanism, including a spindle 100, a pull rod 301 assembly and a shaft end gland 200, wherein the spindle 100 is provided with a spindle inner hole 101 extending from a proximal end to a distal end along an axial direction; the pull rod 301 assembly is arranged in the inner hole 101 of the shaft core, the pull rod 301 assembly comprises a pull rod 301 and a spring 302, the spring 302 extends along the axial direction, the spring 302 is used for providing acting force for resetting the pull rod 301, one end of the spring 302 abuts against the pull rod 301, and the other end of the spring 302 abuts against the shaft core 100; an axial end gland 200 is attached to the proximal end of the shaft core 100, the axial end gland 200 being provided with a through hole 201.

The pull rod 301 is provided with a pull rod neck 303 which penetrates through the through hole 201 and extends outwards, the pull rod neck 303 is provided with a first floating guide groove which extends along the axis direction, the shaft end gland 200 is provided with a first ball mounting hole on the hole wall of the through hole 201, a first ball is arranged in the first ball mounting hole, and the first ball partially protrudes out of the first ball mounting hole and is embedded into the first floating guide groove.

In some embodiments, the arrangement positions of the balls and the floating guide grooves can be opposite, in other words, the rotation stopping structure of the broach mechanism comprises a shaft core 100, a pull rod 301 assembly and a shaft end gland 200, wherein the shaft core 100 is provided with a shaft core inner hole 101 which extends from the proximal end to the distal end along the axial direction; the pull rod 301 assembly is arranged in the inner hole 101 of the shaft core, the pull rod 301 assembly comprises a pull rod 301 and a spring 302, the spring 302 extends along the axis direction, the spring 302 is used for providing acting force for resetting the pull rod 301, one end of the spring 302 abuts against the pull rod 301, and the other end of the spring 302 abuts against the shaft core 100. An axial end gland 200 is attached to the proximal end of the shaft core 100, the axial end gland 200 being provided with a through hole 201.

The pull rod 301 is provided with a pull rod neck 303 which penetrates through the through hole 201 and extends outwards, the pull rod neck 303 is provided with a second ball mounting hole, a second ball is arranged in the second ball mounting hole, the shaft end gland 200 is provided with a second floating guide groove which extends along the axial direction on the hole wall of the through hole 201, and the second ball partially protrudes out of the second ball mounting hole and is embedded into the second floating guide groove.

The utility model discloses an in the embodiment, the ball can adopt the steel ball, and the excircle is smooth, not out of roundness, hardness height.

The embodiment of the utility model also provides an electricity main shaft, including the structure of splining of broach mechanism in above arbitrary embodiment.

The embodiment of the utility model also provides a machine tool, including the electric main shaft in above arbitrary embodiment.

The embodiment of the utility model provides a through designing a structure of splining, it is small, and the position is compact, simple structure, the assembly is simple, and impact toughness is good, and mechanism transmission is quiet and stable, has very strong practical value and commonality, can the wide application in the main shaft that contains broach mechanism, has solved the broach jamming because of the gear shaping structure, the card dies, wearing and tearing, fracture, the problem that broach power reduces, and simultaneously, the main shaft is through long-term unloading and changing the sword, and axle core 100 can not take place to deflect, has improved the wear life of spare part.

In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A rotation stopping structure of a broach mechanism, comprising:

the shaft core is provided with a shaft core inner hole extending from the near end to the far end along the axis direction;

the shaft end gland is connected to the near end of the shaft core and provided with a through hole;

the pull rod is provided with a pull rod neck which penetrates through the via hole and extends outwards, the pull rod neck is provided with a first floating guide groove which extends along the axis direction, the shaft end gland is arranged on the hole wall of the via hole and is provided with a first ball mounting hole, a first ball is arranged in the first ball mounting hole, and the first ball partially protrudes out of the first ball mounting hole and is embedded into the first floating guide groove.

2. A rotation stopping structure of a broach mechanism, characterized by comprising:

3. A rotation stopping structure of a broach mechanism, comprising:

the pull rod is provided with a pull rod neck which penetrates through the rotation stopping inner hole and extends outwards, the pull rod neck is provided with a third floating guide groove extending along the axis direction, the rotation stopping component is provided with a third ball mounting hole on the hole wall of the rotation stopping inner hole, a third ball is arranged in the third ball mounting hole, and the third ball partially protrudes out of the third ball mounting hole and is embedded into the third floating guide groove.

4. The rotation stopping structure of a broach mechanism according to claim 3, wherein the rotation stopping member is provided with a plurality of third ball mounting holes uniformly distributed along the circumferential direction of the rotation stopping inner hole, the neck portion of the pull rod is provided with a plurality of third floating guide grooves corresponding to the third ball mounting holes, and a torsional force is transmitted between the corresponding third ball mounting holes and the third floating guide grooves through third balls.

5. The rotation stop structure of a broach mechanism according to claim 3, wherein the third floating guide groove has a circular arc-shaped, square-shaped or triangular cross section.

6. The rotation stop structure of a broach mechanism according to claim 3, wherein the third ball mounting hole penetrates the rotation stop member in the radial direction of the shaft core, one side of the third ball abuts against a hole wall of the through hole, and the other side of the third ball is fitted into the third floating guide groove.

7. The rotation stopping structure of the broach mechanism according to claim 3, wherein a limit boss is provided at the inner side of the shaft end gland at the proximal end of the pull rod, a groove is provided at the end surface of the tail part of the limit boss, the spring is sleeved in the pull rod, one end of the spring abuts against the limit boss, a protrusion clamped into the groove is provided at the end surface of the spring abutting against the limit boss, the other end of the spring abuts against the shaft core through a support sleeve, and the spring has a flat end surface matched with the support sleeve.

8. The rotation stop structure of a broach mechanism according to claim 3, characterized in that the spring is a flocked double-wound spring.

9. An electric spindle comprising the rotation stopping structure of the broach mechanism according to any one of claims 1 to 8.

10. A machine tool comprising an electric spindle according to claim 9.