阅读说明：本技术 一种主轴拉刀机构的防转结构 (Anti-rotation structure of spindle broach mechanism ) 是由 黄绍样 汤丽君 詹邦藩 栾新新 李坚 李鑫池 李博文 汤秀清 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种主轴拉刀机构的防转结构,编码盘固定于轴芯组件端部,拉杆收容于轴芯组件,主轴拉刀机构的防转结构还包括上防转组件、双绕弹簧以及推力轴承,上防转组件固定于编码盘并与拉杆接触,双绕弹簧套设于拉杆及轴芯组件之间,推力轴承套设于拉杆,双绕弹簧一端与拉杆卡扣,另一端与推力轴承接触,当双绕弹簧产生扭转力时,双绕弹簧上端扭转力传递至拉杆,防转组件使拉杆上端限位,推力轴承将双绕弹簧下端扭转力抵消,通过上述设计,上防转组件抑制主轴拉刀机构与轴芯组件间的相对偏转,避免为纠正轴芯的偏转引起的机床系统因电流负载过大的报警；推力轴承抵消双绕弹簧下压时的扭转力,解决了双绕弹簧外圆过度增大的难题。(The invention discloses an anti-rotation structure of a main shaft broach mechanism, wherein a coding disc is fixed at the end part of a shaft core component, a pull rod is accommodated in the shaft core component, the anti-rotation structure of the main shaft broach mechanism also comprises an upper anti-rotation component, a double-wound spring and a thrust bearing, the upper anti-rotation component is fixed on the coding disc and is contacted with the pull rod, the double-wound spring is sleeved between the pull rod and the shaft core component, the thrust bearing is sleeved on the pull rod, one end of the double-wound spring is buckled with the pull rod, the other end of the double-wound spring is contacted with the thrust, when the double-wound spring generates torsional force, the torsional force at the upper end of the double-wound spring is transmitted to the pull rod, the anti-rotation component enables the upper end of the pull rod to limit, the thrust bearing offsets the torsional force at the lower end of the double-wound spring, through the design, the upper anti-rotation component inhibits the relative deflection between the main shaft broach mechanism and the shaft core component, and avoids the alarm of overlarge current load of a machine tool system caused by correcting the deflection of the shaft core; the thrust bearing offsets the torsion force when the double-wound spring is pressed down, and the problem that the excircle of the double-wound spring is excessively increased is solved.)

1. The utility model provides a main shaft broach mechanism prevents rotating structure, includes coding disc, pull rod and axle core subassembly, the coding disc is fixed in axle core subassembly tip, the pull rod accept in axle core subassembly, its characterized in that: the utility model discloses a main shaft broach mechanism, including the main shaft broach mechanism, the main shaft broach mechanism is equipped with the pull rod, and the main shaft broach mechanism is equipped with the anti-rotation structure, and the anti-rotation structure still includes and prevents changeing subassembly, two around spring and thrust bearing, on prevent changeing the subassembly and be fixed in the code disc and with the pull rod contact, two around the spring housing locate the pull rod reaches between the axle core subassembly, thrust bearing housing is located the pull rod, two around spring one end with the pull rod buckle, the other end with the thrust bearing contact, when two around the spring produce the torsional force, two around spring upper end torsional force transmit to the pull rod, prevent changeing the subassembly and make the pull rod.

2. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: the thrust bearing comprises an upper thrust washer, a retainer, a rolling body and a lower thrust washer, wherein the upper thrust washer and the lower thrust washer are respectively provided with a roller path, the retainer is positioned between the upper thrust washer and the lower thrust washer, and the rolling body is arranged on the retainer and contained between the upper thrust washer and the lower thrust washer.

3. An anti-rotation structure of a spindle broach mechanism according to claim 2, characterized in that: one end of the double-wound spring is a plane, and the plane is in contact with the upper push pad.

4. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: one end of the double-winding spring is provided with a boss, the pull rod is provided with a groove, and the boss is embedded into the groove.

5. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: the upper anti-rotation assembly comprises an anti-rotation plate, a pin and a screw, the anti-rotation plate is fixed on the coding disc through the screw, and the pin is fixed on the anti-rotation plate and extends into the long hole of the pull rod.

6. An anti-rotation structure of a spindle broach mechanism according to claim 5, characterized in that: the anti-rotation plate is provided with a mounting hole, and the pin is in interference fit with the mounting hole.

7. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: the upper anti-rotation component comprises an anti-rotation plate and a screw, the anti-rotation plate is fixed on the coding disc through the screw, the anti-rotation plate is provided with a toothed hole, the pull rod is correspondingly provided with a toothed edge, and the toothed edge is located in the toothed hole to enable the pull rod to be circumferentially locked with the anti-rotation plate.

8. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: the upper anti-rotation component comprises an anti-rotation plate and a screw, the anti-rotation plate is fixed on the coding disc through the screw, the anti-rotation plate is provided with a polygonal hole, the pull rod is correspondingly provided with a polygonal edge, and the polygonal edge is positioned in the polygonal hole to enable the pull rod and the anti-rotation plate to be locked circumferentially.

9. An anti-rotation structure of a spindle broach mechanism according to claim 1, characterized in that: the upper anti-rotation assembly comprises a screw and an anti-rotation block, the anti-rotation block is fixed on the coding disc through the screw, the pull rod is provided with a sliding groove, and one end of the anti-rotation block is located in the sliding groove.

10. An anti-rotation structure of a spindle broach mechanism according to claim 9, characterized in that: the extending direction of the sliding groove is the same as that of the pull rod.

Technical Field

The invention relates to a spindle, in particular to an anti-rotation structure of a spindle broach mechanism.

Background

The most common main shaft broach mechanism is a disc spring broach mechanism, and the spring broach mechanism is a relatively novel broach mechanism. Compared with a disc spring broach mechanism, the disc spring broach mechanism is simple in structure, long in service life and convenient to maintain. The main shaft is at the in-process of changing the handle of a knife, unloads the external force that the sword mechanism applyed at the pull rod top, drives the spring and pushes down, pushes down the in-process spring and can produce the torsional force along the rotatory spiral direction, thereby leads to broach mechanism to have relative rotation in the axle core and drive the rotation of axle core. The process that the spindle core deflects at a certain angle can cause the alarm that the current load rate of a machine tool system is overlarge for the spindle which is provided with a precise encoder for positioning.

The relative rotation of broach mechanism and axle core can cause broach mechanism and axle core to have wearing and tearing of different degrees in the long-term handle of a knife change in-process of main shaft, influences the life of part. The movable related parts have uncertain relative position changes, and the original dynamic balance setting of the main shaft is damaged. When the main shaft runs, the vibration of the main shaft is increased, the unbalance of the main shaft is poor, and the machining precision of the main shaft is influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the anti-rotation structure of the main shaft broach mechanism, which effectively solves the problem that when the main shaft is replaced, a lathe system gives an alarm due to overlarge current load rate and reduces the abrasion between the broach mechanism and a shaft core.

The purpose of the invention is realized by adopting the following technical scheme:

the utility model provides a main shaft broach mechanism prevent rotating structure, includes coding dish, pull rod and axle core subassembly, the coding dish is fixed in axle core subassembly tip, the pull rod accept in axle core subassembly, main shaft broach mechanism prevent rotating structure still includes and prevents rotating subassembly, two around spring and thrust bearing, on prevent rotating the subassembly and be fixed in coding dish and with the pull rod contact, two around the spring housing locate the pull rod reaches between the axle core subassembly, the thrust bearing cover is located the pull rod, two around spring one end with the pull rod buckle, the other end with the thrust bearing contact, work as when two around spring produce torsional force, two around spring upper end torsional force transmit extremely the pull rod, prevent rotating the subassembly and make the pull rod upper end is spacing, thrust bearing will two around spring lower extreme torsional force offset.

Further, the thrust bearing comprises an upper thrust washer, a retainer, a rolling body and a lower thrust washer, wherein the upper thrust washer and the lower thrust washer are respectively provided with a roller path, the retainer is positioned between the upper thrust washer and the lower thrust washer, and the rolling body is installed on the retainer and contained between the upper thrust washer and the lower thrust washer.

Further, one end of the double-wound spring is a plane, and the plane is in contact with the upper push pad.

Furthermore, one end of the double-winding spring is provided with a boss, the pull rod is provided with a groove, and the boss is embedded into the groove.

Furthermore, go up to prevent changeing the subassembly and include preventing the flitch, pin and screw, prevent that the flitch passes through the screw fixation is in the coding disc, the pin is fixed in prevent changeing the flitch and stretching into in the slot hole of pull rod.

Further, the rotation preventing plate is provided with a mounting hole, and the pin is in interference fit with the mounting hole.

Furthermore, go up to prevent changeing the subassembly and include preventing flitch and screw, prevent the flitch through the screw fixation is in the coding dish, prevent that the flitch is equipped with the tooth shape hole, the pull rod corresponds and is equipped with the profile of tooth edge, the profile of tooth edge is located make in the tooth shape hole the pull rod with prevent changeing the locking of flitch circumference.

Furthermore, the upper anti-rotation component comprises an anti-rotation plate and a screw, the anti-rotation plate is fixed on the coding disc through the screw, the anti-rotation plate is provided with a polygonal hole, the pull rod is correspondingly provided with a polygonal edge, and the polygonal edge is positioned in the polygonal hole to enable the pull rod and the anti-rotation plate to be locked circumferentially.

Furthermore, the upper anti-rotation component comprises a screw and an anti-rotation block, the anti-rotation block is fixed on the coding disc through the screw, the pull rod is provided with a sliding groove, and one end of the anti-rotation block is located in the sliding groove.

Further, the extending direction of the sliding groove is the same as the extending direction of the pull rod.

Compared with the prior art, the main shaft broach mechanism has the following advantages:

(1) the upper anti-rotation component inhibits the relative deflection between the main shaft broach mechanism and the shaft core component.

(2) The thrust bearing offsets the torsion force when the double-wound spring is pressed down, solves the difficult problem that the excircle of the double-wound spring is excessively increased, improves the condition that parts such as an anti-rotation structure and the like are seriously abraded due to the torsion trend of the double-wound spring, and ensures that the service life of the main shaft broach mechanism is longer. The method and the device prevent the spindle motor from setting the given current for correcting the deflection of the spindle core to be always in a low level in the long-term frequent tool changing process, and avoid the alarm of the machine tool system caused by overlarge current load.

(3) The positioning mode of the spring broach mechanism abandons the defect that the excircle of the disc spring in the disc spring broach mechanism can not be used as a positioning position and the pull rod is used as a positioning position, the self-correcting function is achieved after double-winding spring flocking is applied, and a stable positioning structure is formed by three-point positioning consisting of the excircle of the big head end of the pull rod, the excircle of the whole body after double-winding spring flocking and the excircle of the pulling claw assembly. In the spring broach mechanism, because the pull rod is not used for positioning the double-wound spring, the additional mass of the bending deformation of the pull rod caused by the high-speed centrifugation of the disc spring is not arranged on the pull rod in the high-speed operation process of the main shaft, and the bending deformation of the pull rod is smaller. And the inner hole of the double-winding spring is larger than that of the disc spring, so that the pull rod can be thicker, the anti-bending deformation capacity of the pull rod is improved, and the stability of parts of the broach mechanism in the tool changing process is further improved. The main shaft can ensure that the parts of the broach mechanism can not change in relative positions in the long-term frequent tool changing process, the original unbalance amount of the main shaft changes very little, and the integral vibration of the main shaft is ensured.

Drawings

FIG. 1 is an exploded view of a first embodiment of an anti-rotation structure of a spindle broach mechanism according to the present invention;

FIG. 2 is a schematic structural view of the spindle broach mechanism of FIG. 1 in a state in which the tool shanks are tensioned;

FIG. 3 is an enlarged view of the anti-rotation feature A of the spindle broach mechanism of FIG. 2;

FIG. 4 is an exploded view of a thrust bearing of the spindle broach mechanism of FIG. 1;

FIG. 5 is a schematic structural view of the spindle broach mechanism of FIG. 1 with the shank released;

FIG. 6 is a schematic structural view of a second embodiment of an anti-rotation structure of a spindle broach mechanism according to the present invention;

FIG. 7 is a partial structural perspective view of an anti-rotation structure of the spindle broach mechanism of FIG. 6;

FIG. 8 is a perspective view showing a partial structure of an anti-rotation structure of a third embodiment of the spindle broach mechanism according to the present invention;

FIG. 9 is an exploded view of a fourth embodiment of an anti-rotation feature of the spindle broach mechanism according to the present invention;

FIG. 10 is an internal structural view of an anti-rotation structure of the spindle broach mechanism of FIG. 9;

fig. 11 is an enlarged view of the spindle broach mechanism of fig. 10 at rotation preventing structure B.

In the figure: 100. an anti-rotation structure of the main shaft broach mechanism; 10. a nut; 20. a code disc; 30. an upper anti-rotation component; 31. an anti-rotation plate; 310. a fixing hole; 311. mounting holes; 312. a toothed hole; 313. a polygonal hole; 32. a pin; 33. a screw; 34. a rotation prevention block; 40. a pull rod; 41. a toothed edge; 42. a polygonal edge; 43. a chute; 50. a double-wound spring; 60. a spindle assembly; 70. a thrust bearing; 71. an upper thrust washer; 72. a holder; 73. a rolling body; 74. a lower thrust washer; 740. a raceway; 80. a pull pawl assembly; 90. a knife handle; 200. a cutter unloading structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, a first embodiment of an anti-rotation structure 100 of a spindle broach mechanism according to the present invention is shown, in which the anti-rotation structure 100 of the spindle broach mechanism includes a nut 10, a code disc 20, an upper anti-rotation component 30, a pull rod 40, a double-wound spring 50, a spindle core component 60, a thrust bearing 70, a pull claw component 80, and a tool shank 90.

The upper anti-rotation assembly 30 includes an anti-rotation plate 31, a pin 32, and a screw 33. The number of pins 32 is two and the number of screws 33 is four. The screw 33 is a socket head cap screw. The rotation preventing plate 31 is provided with a fixing hole 310 and a mounting hole 311. The number of the fixing holes 310 is four, and the fixing holes 310 are engaged with the screws 33. The mounting hole 311 and the pin 32 are in interference fit to fix the pin 32 to the rotation preventing plate 31.

The programming disc 20 is provided with a through hole for the passage of the pin 32 and a screw hole for the cooperation with the screw 33. The code wheel 20 is also provided with an internal thread matched with the shaft core component 60 and a groove for installing the anti-rotation plate 31.

The matching part of the pull rod 40 and the boss of the double-wound spring 50 is designed with a groove, and the matching part with the pin 32 is designed with a long hole.

One end of the double-wound spring 50 is designed with a boss on a plane, and the other end is designed with a plane. The surface of the double-wound spring 50 is planted with fluff which is dense, tough, extremely difficult to drop and has a good self-lubricating effect. After the main shaft runs at a high speed, the excircle is attached to the hole wall of the inner hole of the shaft core assembly 60 through centrifugal expansion generated by the double-wound spring 50, and the attachment is more compact due to the dense fluff structure of the double-wound spring 50, so that the double-wound spring 50 has the functions of self-correction and centered and symmetrical position.

The thrust bearing 70 includes an upper thrust washer 71, a cage 72, rolling bodies 73, and a lower thrust washer 74. The upper thrust washer 71 and the lower thrust washer 74 are provided with a raceway 740, respectively, and the rolling bodies 73 can roll annularly around the raceway 740. The rolling bodies 73 are mounted in the cage 72 between the upper thrust washer 71 and the lower thrust washer 74. The upper thrust washer 71 and the lower thrust washer 74 can rotate with one stationary and the other.

When the anti-rotation structure 100 of the spindle broach mechanism is assembled, the boss of the double-wound spring 50 is embedded into the corresponding groove of the pull rod 40 to fix the two, and the thrust bearing 70 is assembled in the planar end of the double-wound spring 50 and then assembled into the spindle core assembly 60. The code wheel 20 is locked to the spindle assembly 60 by a threaded connection. After the long hole of the pull rod 40 is aligned with the through hole of the coding disc 20, the whole anti-rotation plate 31 after the pin 32 is assembled in an interference manner is aligned with the through hole and then is installed in the groove of the coding disc 20, the screw 33 is tightened, and then the nut 10 is assembled. Finally, a pull jaw assembly 80 is mounted from the other end of the spindle assembly 60 to form the finished spindle broach mechanism.

Principle of restraining deflection of shaft core

When the main shaft provided with the precision encoder for positioning is positioned, the corresponding current is given by the main shaft motor to generate corresponding torsional force, and the deflection of the shaft core is corrected. When the tool shank 90 is replaced, the larger the torsional force generated by the spring is, the larger the current given by the motor for correcting the deflection of the shaft core is, and the alarm that the current load of a machine tool system is overlarge can be given when the current exceeds the design upper limit. In order to prevent the spindle shaft from deflecting due to the relative rotation of the pull rod 40 in the spindle core assembly 60 when the tool shank 90 is replaced, a deflection-preventing mechanism must be provided to ensure that the pull rod 40 moves only one degree of freedom up and down in the movement of the spindle shaft in the spindle core assembly 60.

When the cutter unloading structure 200 is pressed downwards, under the combined action of an external force F generated by the cutter unloading structure and the resilience force of the double-wound spring 50, the surface of the cutter unloading structure 200, which is in contact with the pull rod 40, generates friction force, only the friction force is insufficient to prevent the torsional force from completing the rotation-proof task of the cutter pulling mechanism, at the moment, the pin 32 and the pull rod 40 are subjected to the spacing action intervention work, so that the pull rod 40 and the coding disc 20 form a whole, the coding disc 20 is fixed with the shaft core assembly 60, and the spindle shaft core assembly 60 is ensured not to deflect along with the process of tool changing of the spindle.

Principle of counteracting spring torsion

During the process of replacing the tool shank 90, the double-wound spring 50 generates huge resilience force and torsional force when compressed. Because the conventional spring broach mechanism has no thrust bearing 70 structure, the resilience of the double-wound spring 50 generates friction force on the lower end face of the double-wound spring 50, which is in common contact with the shaft core assembly 60, so that the double-wound spring and the shaft core assembly are relatively fixed. Meanwhile, the anti-rotation structure limits the twisting tendency of the upper end surface of the double-wound spring 50. When the double-wound spring 50 is compressed, the overall excircle of the double-wound spring 50 is excessively increased due to the generation of torsional force, the inner wall of the shaft core assembly 60 is extruded, and the anti-rotation structural parts and other related contact parts are seriously abraded through the long-time frequent tool changing process of the main shaft, so that the vibration performance of the main shaft is seriously influenced. After the spring broach mechanism is designed into a structure of the thrust bearing 70, due to the structure that the upper thrust washer 71 and the lower thrust washer 74 can rotate relatively independently, when the double-wound spring 50 is pressed down, the generated torsional force automatically guides the upper thrust washer 71 of the thrust bearing 70 to rotate synchronously through the lower end face of the spring, and the torsional force is counteracted. Not only solves the dilemma of excessive increase of the whole excircle of the double-wound spring 50, but also greatly improves the condition of serious abrasion of parts such as an anti-rotation structure and the like caused by the twisting trend of the double-wound spring 50, and ensures that the service life of the main shaft broach mechanism is longer.

Principle of spindle vibration control:

traditional dish spring broach mechanism, belleville spring pass through stamping forming, because mould or the reason of the batch of dish spring lead to dish spring hole and external diameter size discrepancy during the punching press, and the uniformity is than relatively poor. And dozens of hundreds of disc springs are needed to assemble a complete disc spring broach mechanism. Because the consistency of the inner hole of the disc spring is poor, after the disc spring is assembled to the pull rod 40, the gap formed by the inner hole of the disc spring and the pull rod 40 is inconsistent, and the inner hole of the spindle shaft core assembly 60 is not matched with the excircle of the disc spring, so that the gap is large. The disc spring is most likely to swing in the high-speed rotation process of the main shaft, and the pull rod 40 can also be randomly bent and deformed, so that the relative position of the disc spring of the main shaft is changed, the original dynamic balance of the main shaft is damaged, and the vibration condition of the main shaft is influenced.

The surface of the double-winding spring 50 in the spring broach mechanism is implanted with fluff which is dense, tough, extremely difficult to drop and has a good self-lubricating effect. In the design of the spindle, the inner bore of the spindle assembly 60 is designed to have the correct clearance from the outer circumference of the double wrap spring 50. After the main shaft runs at a high speed, the excircle is attached to the hole wall of the inner hole of the shaft core assembly 60 through centrifugal expansion generated by the double-wound spring 50, and the double-wound spring 50 is tightly attached due to a dense villus structure, so that the double-wound spring 50 has the functions of self-correction and centered and symmetrical positions. Thus, the double wrap spring 50 no longer acts like a disc spring and uses the pull rod 40 as a stop to limit its whipping motion. Meanwhile, the outer circle of the large head end of the pull rod 40 and the outer circle of the pull claw assembly 80 are designed to have a small gap with the inner hole of the shaft core assembly 60, so that the positioning error of the pull rod 40 and the pull claw assembly 80 is ensured to be extremely small. Thus, the inner hole of the shaft core assembly 60 is used as a reference, and three-point positioning consisting of the outer circle of the large end of the pull rod 40, the outer circle of the double-wound spring 50 and the outer circle of the pull claw assembly 80 has extremely strong stability, so that the whole broaching tool mechanism and the shaft core assembly 60 are on the same axis, and the relative change of relevant parts of the broaching tool mechanism can not be caused along with the broaching process of loosening the main shaft. When the double-winding spring 50 is designed, under the conditions of ensuring the spring force and prolonging the service life, the inner hole of the double-winding spring 50 can be larger than the inner hole of the disc spring, and the size of the excircle of the pull rod 40 matched with the inner hole of the double-winding spring 50 can be larger, so that the pull rod 40 has stronger capacity of resisting any bending deformation in the process of high-speed operation of the main shaft, the probability of deformation of parts is further reduced, the vibration stability of the main shaft is better, and the vibration controllability of the main shaft is greatly improved. Based on the design invention, the spring broach mechanism and the anti-rotation structure thereof can be widely applied to high-speed and ultrahigh-speed spindles.

Referring to fig. 6 to 7, a second embodiment of an anti-rotation structure 100 of a spindle broach mechanism according to the present invention is shown, in which the anti-rotation structure 100 of the spindle broach mechanism is substantially the same as the first embodiment, but the difference is that: the upper anti-rotation component 30 only comprises the anti-rotation plate 31, the anti-rotation plate 31 is provided with a toothed hole 312, and the matching part of the pull rod 40 and the anti-rotation plate 31 is correspondingly provided with a toothed edge 41, so that the design of the pin 32 in the first embodiment is eliminated. When the spindle is subjected to tool changing, the pull rod 40 is matched with the tooth-shaped edge 41 of the anti-rotation plate 31, so that the deflection of the pull rod 40 on the spindle core assembly 60 is limited, and the anti-rotation function of the spindle broach mechanism is realized.

Referring to fig. 8, a third embodiment of an anti-rotation structure 100 of a spindle broach mechanism according to the present invention is shown, in which the anti-rotation structure 100 of the spindle broach mechanism is substantially the same as the second embodiment, but the difference is: the anti-rotation plate 31 is provided with a polygonal hole 313, the matching part of the pull rod 40 and the anti-rotation plate 31 is correspondingly provided with a polygonal edge 42, and when the spindle is subjected to tool changing, the deflection of the pull rod 40 on the spindle core component 60 is limited through the matching of the pull rod 40 and the polygonal edge 42 of the anti-rotation plate 31, so that the anti-rotation function of the spindle broach mechanism is realized.

Referring to fig. 9 to 11, a fourth embodiment of an anti-rotation structure 100 of a spindle broach mechanism according to the present invention is shown, in which the anti-rotation structure 100 of the spindle broach mechanism is substantially the same as the first embodiment, but the difference is: the upper anti-rotation assembly 30 comprises a screw 33 and an anti-rotation block 34, the coding disc 20 is provided with a straight groove for mounting the anti-rotation block 34 and a connecting hole for the screw 33, the anti-rotation block 34 is provided with a through hole through which the screw 33 can pass, and the pull rod 40 is provided with a sliding groove 43. During installation, the anti-rotation block 34 is inserted into the sliding groove 43 of the pull rod 40 by the screw 33 and locked into the straight groove of the code wheel 20. When the spindle is subjected to tool changing, the rotation preventing block 34 is embedded into the sliding groove 43 of the pull rod 40, so that the deflection of the pull rod 40 on the spindle core assembly 60 is limited, and the rotation preventing function of the spindle broach mechanism is realized.

Through the design, the anti-rotation structure 100 of the main shaft broach mechanism is simple in structure, easy to machine, convenient and fast to install, stable in performance, high in practical value and universality and capable of being widely applied to the existing main shaft. The spring broach mechanism is compared under the condition of existence of an anti-rotation structure, the unloading load rate of the spindle with the anti-rotation structure is reduced by 25-30%, the load rate value is stable, and the alarm caused by overlarge current load rate of a lathe system when the tool holder 90 of the spindle is replaced is effectively avoided. Meanwhile, after the main shaft is subjected to tool changing for more than 500 ten thousand times, the parts of the broach mechanism cannot be subjected to relative position change, and the aim of small overall vibration change of the main shaft is fulfilled. Therefore, the spring broach mechanism with the anti-rotation structure has extremely strong vibration holding performance and can be effectively applied to main shafts with different rotating speeds.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.