阅读说明：本技术 一种快扩与快缩辅助装夹装置 (Auxiliary clamping device capable of expanding and shrinking quickly ) 是由 张顺红 于 2020-07-27 设计创作，主要内容包括：本发明公开了一种快扩与快缩辅助装夹装置；包括车床主体,车床主体内设有开口向前的切屑腔,切屑腔左侧连通设有三爪卡盘腔,切屑腔上侧设有宽齿腔,宽齿腔上侧设有向上延伸的卡块运动腔,卡块运动腔上侧连通设有卡块限制腔,卡块限制腔上侧连通设有卡块腔,宽齿腔左侧设有变速腔,电机大齿轮通过从动小齿轮带动从动轴转动,最终实现装夹轴低扭矩的高速转动,从而实现快速装夹,提高加工效率,当卡爪接触到工件后,通过扭矩检测器换挡,换挡后电机小齿轮通过从动大齿轮带动从动轴转动,最终实现装夹轴高扭矩的低速转动,从而实现低速夹紧,装夹的同时风扇的工作清理切屑,提高了装夹的定位精度。(The invention discloses a quick expansion and quick shrinkage auxiliary clamping device; comprises a lathe body, a cutting cavity with a forward opening is arranged in the lathe body, a three-jaw chuck cavity is communicated and arranged at the left side of the cutting cavity, a wide tooth cavity is arranged at the upper side of the cutting cavity, a fixture block movement cavity extending upwards is arranged at the upper side of the wide tooth cavity, a fixture block limiting cavity is communicated and arranged at the upper side of the fixture block movement cavity, a fixture block cavity is communicated and arranged at the upper side of the fixture block limiting cavity, a speed change cavity is arranged at the left side of the wide tooth cavity, a motor gear wheel drives a driven shaft to rotate through a driven pinion, and, thereby realizing rapid clamping and improving the processing efficiency, after the claw is contacted with a workpiece, the gear is shifted through the torque detector, the motor pinion drives the driven shaft to rotate through the driven bull gear after the gear shifting, and finally realizing the low-speed rotation of the clamping shaft with high torque, therefore, low-speed clamping is realized, chips are cleaned by the operation of the fan during clamping, and the positioning precision of clamping is improved.)

1. The utility model provides a expand soon and contract supplementary clamping device soon, includes the lathe main part, its characterized in that: the lathe is characterized in that a cutting cavity with a forward opening is arranged in the lathe body, the left side of the cutting cavity is communicated with a three-jaw chuck cavity, a wide tooth cavity is arranged on the upper side of the cutting cavity, a fixture block movement cavity extending upwards is arranged on the upper side of the wide tooth cavity, a fixture block limiting cavity is communicated with the upper side of the fixture block limiting cavity, a fixture block cavity is communicated with the upper side of the fixture block limiting cavity, a speed change cavity is arranged on the left side of the wide tooth cavity, a clamping belt wheel cavity extending rightwards and located on the left side of the fixture block movement cavity is arranged on the upper side of the speed change cavity, a middle belt wheel cavity extending backwards is arranged on the upper side of the clamping belt wheel cavity, a spring cavity located on the front side of the middle belt wheel cavity is arranged on the upper side of the speed change cavity, a magnet cavity is arranged on the lower side of the speed change cavity, a belt wheel cavity extending rightwards is, the clamping mechanism is characterized in that an upper shaft sleeve which extends upwards to the lower end wall of the clamping block movement cavity is connected to the upper end wall of the wide tooth cavity in a rotating fit mode, a lower shaft sleeve which extends downwards to the upper end wall of the cutting chip cavity is connected to the lower end wall of the wide tooth cavity in a rotating fit mode, the lower shaft sleeve is connected with a lower spline in a rotating fit mode and extends upwards to penetrate through the wide tooth cavity, the clamping block movement cavity and the clamping block limiting cavity reach the clamping shaft in the clamping block cavity and extend downwards to the cutting chip cavity, the clamping shaft is connected with the upper shaft sleeve in a spline fit mode, and a clamping block fixedly connected with the clamping shaft.

2. The auxiliary clamping device for quick expansion and quick contraction according to claim 1, wherein: the rear end wall of the cutting cavity is fixedly connected with a ventilation pipe, a ventilation cavity which is communicated from front left to back right and can correspond to the fan cavity is arranged in the ventilation pipe, the tail end of the front side of the fan cavity is fixedly connected with a filter screen, the rear end wall of the fan cavity is rotationally matched and connected with a fan shaft which extends forwards into the fan cavity and extends backwards into the conical tooth cavity, the rear end wall of the cutting cavity is fixedly connected with a support plate positioned on the left side of the ventilation pipe, the cambered surface at the front end of the support plate is fixedly connected with a contact switch, the left end wall of the three-jaw chuck cavity is connected with a main shaft in a rotating fit manner, the right end surface of the main shaft is fixedly connected with a three-jaw chuck, the outer disc of three-jaw chuck is equipped with the outside hexagon socket head cap chamber of opening in, three-jaw chuck right-hand member face sliding fit is connected with three use the main shaft is central circumference and distributes the jack catch, jack catch outside end face fixedly connected with contact block.

3. The auxiliary clamping device for quick expansion and quick contraction according to claim 1, wherein: the wide gear cavity is internally provided with a gear for clamping fixedly connected with the clamping shaft, the tail end of the lower side of the clamping shaft is internally provided with a return cavity with a downward opening, the tail end of the lower side of the clamping shaft is fixedly connected with a connecting block, the connecting block is internally and densely distributed with thin rod cavities, the thin rod cavities are connected with thin rods in a sliding fit manner, the upper end walls of the wide gear cavities are connected with wide gear shafts which extend downwards into the wide gear cavities and extend upwards into the clamping belt wheel cavities in a rotating fit manner, the wide gear cavities are internally provided with wide gears fixedly connected with the wide gear shafts, the clamping belt wheel cavities are internally provided with clamping secondary belt wheels fixedly connected with the wide gear shafts, the lower end walls of the clamping belt wheel cavities are connected with driven shafts which extend downwards into the speed changing cavities and extend backwards through the clamping belt wheel cavities to the driven shafts in the middle belt wheel cavities in a rotating fit manner, and the clamping belt wheel cavities, and a belt for clamping is connected between the clamping main belt wheel and the clamping auxiliary belt wheel in a power fit manner.

4. The auxiliary clamping device for quick expansion and quick contraction according to claim 1, wherein: the upper side of the speed changing cavity is provided with a motor positioned on the left side of the middle belt wheel cavity, the lower end face of the motor is fixedly connected with a torque shaft extending downwards, the lower end face of the torque shaft is fixedly connected with a torque sensor, the lower end face of the torque sensor is fixedly connected with a motor shaft extending downwards into the speed changing cavity, the lower end of the lower side of the motor shaft is fixedly connected with a motor pinion positioned in the speed changing cavity, the speed changing cavity is internally provided with a motor gear wheel fixedly connected with the motor shaft and positioned on the upper side of the motor pinion, the lower end of the lower side of the driven shaft is connected with a driven gear wheel positioned in the speed changing cavity in a rotating fit manner, the driven gear wheel is meshed with the motor pinion, a synchronizer connected with the driven shaft in a spline fit manner and positioned, the variable speed intracavity be equipped with driven shaft normal running fit is connected and is located the driven pinion of synchronous ware upside, driven pinion with the synchronous ware meshing, driven pinion with motor gear wheel meshing.

5. The auxiliary clamping device for quick expansion and quick contraction as claimed in claim 4, wherein: a sleeve connecting rod fixedly connected with the sleeve is arranged in the speed changing cavity, the tail end of the front side of the sleeve connecting rod is fixedly connected with a connecting block, the upper end surface of the connecting block is fixedly connected with an upward extending upper connecting rod, the tail end of the upper side of the upper connecting rod is fixedly connected with a spring block positioned in the spring cavity, the spring block is connected with the spring cavity in a sliding fit manner, a spring is fixedly connected between the upper end wall of the spring cavity and the upper end surface of the spring block, the lower end surface of the connecting block is fixedly connected with a lower connecting rod extending downwards, the tail end of the lower side of the lower connecting rod is fixedly connected with a magnet positioned in the magnet cavity, the lower end wall of the magnet cavity is fixedly connected with a coil magnet, a middle main belt wheel fixedly connected with the driven shaft is arranged in the middle belt wheel cavity, and the lower end wall of the middle belt wheel cavity is connected with a middle belt wheel shaft which upwards extends into the middle belt wheel cavity and downwards extends into the belt wheel cavity for the fan in a rotating and matching manner.

6. The auxiliary clamping device for quick expansion and quick contraction as claimed in claim 5, wherein: the fan belt pulley comprises a fan belt pulley cavity, a fan belt pulley shaft, a fan belt pulley, a driving bevel gear, a fan shaft, a driving bevel gear, a driven bevel gear, a fan shaft and a fan shaft, wherein the middle belt pulley cavity is fixedly connected with the middle belt pulley shaft, the middle belt pulley is connected with the middle belt pulley, the, and a fan fixedly connected with the fan shaft is arranged in the fan cavity.

Technical Field

The invention relates to the technical field of lathes, in particular to a quick-expanding and quick-contracting auxiliary clamping device.

Background

The three-jaw chuck is a machine tool accessory for clamping and positioning a workpiece by utilizing the radial movement of three movable jaws uniformly distributed on a chuck body, the opening of the three-jaw chuck is far larger than the size of the workpiece to be machined before machining, or the opening of the three-jaw chuck is far smaller than the size of the workpiece to be machined, usually, an operator needs to manually use a three-jaw chuck wrench to reduce or enlarge the three-jaw chuck, the labor force of the operator is consumed, and the working efficiency is also reduced.

Disclosure of Invention

Aiming at the defects of the technology, the invention provides an auxiliary clamping device for quick expansion and quick contraction, which can overcome the defects.

The invention relates to a quick expansion and quick contraction auxiliary clamping device which comprises a lathe body, wherein a chip cavity with a forward opening is arranged in the lathe body, the left side of the chip cavity is communicated with a three-jaw chuck cavity, a wide tooth cavity is arranged on the upper side of the chip cavity, a fixture block movement cavity extending upwards is arranged on the upper side of the wide tooth cavity, a fixture block limiting cavity is communicated with the upper side of the fixture block movement cavity, a fixture block cavity is communicated with the upper side of the fixture block limiting cavity, a speed change cavity is arranged on the left side of the wide tooth cavity, a clamping belt wheel cavity extending rightwards and positioned on the left side of the fixture block movement cavity is arranged on the upper side of the speed change cavity, an intermediate belt wheel cavity extending backwards is arranged on the upper side of the clamping belt wheel cavity, a spring cavity positioned on the front side of the intermediate belt wheel cavity is arranged on the upper side of the speed change cavity, a, the smear metal chamber rear side intercommunication is equipped with the fan chamber, fan chamber rear side is equipped with the awl tooth chamber, wide tooth chamber upper end wall normal running fit is connected with and upwards extends the upper portion axle sleeve of fixture block motion chamber lower end wall, wide tooth chamber lower end wall normal running fit is connected with and downwards extends the lower part axle sleeve of smear metal chamber upper end wall, lower part axle sleeve internal spline fit is connected with and upwards extends and runs through wide tooth chamber fixture block motion chamber with fixture block restriction chamber extremely fixture block intracavity and downwardly extending to the clamping axle of smear metal intracavity, the clamping axle with upper portion axle sleeve spline fit connects, the fixture block intracavity be equipped with clamping axle fixed connection's fixture block.

On the basis of the technical scheme, the rear end wall of the chip cavity is fixedly connected with a ventilation pipe, the ventilation pipe is internally provided with a ventilation cavity which is communicated from front left to back right and can correspond to the fan cavity, the tail end of the front side of the fan cavity is fixedly connected with a filter screen, the rear end wall of the fan cavity is connected with a fan shaft which extends forwards into the fan cavity and backwards into the bevel cavity in a rotating fit manner, the rear end wall of the chip cavity is fixedly connected with a support plate positioned on the left side of the ventilation pipe, the front end cambered surface of the support plate is fixedly connected with a contact switch, the left end wall of the three-jaw chuck cavity is connected with a main shaft in a rotating fit manner, the right end surface of the main shaft is fixedly connected with a three-jaw chuck, the outer circular surface of the three-jaw chuck is internally provided with a hexagonal cavity with an outward opening, and, and the end face of the outer side of the clamping jaw is fixedly connected with a contact block.

On the basis of the technical scheme, a gear for clamping fixedly connected with the clamping shaft is arranged in the wide gear cavity, a return cavity with a downward opening is arranged in the tail end of the lower side of the clamping shaft, a connecting block is fixedly connected with the tail end of the lower side of the clamping shaft, thin rod cavities are densely distributed in the connecting block, thin rods are connected in a sliding fit manner in the thin rod cavities, a wide gear shaft extending downwards into the wide gear cavity and extending upwards into the clamping belt wheel cavity is connected in the wide gear cavity in a rotating fit manner, wide teeth fixedly connected with the wide gear shaft are arranged in the wide gear cavity, a clamping slave belt wheel fixedly connected with the wide gear shaft is arranged in the clamping belt wheel cavity, a driven shaft extending downwards into the speed change cavity and extending backwards through the clamping belt wheel cavity to the middle belt wheel cavity is connected in a rotating fit manner in the lower end wall of the clamping belt wheel cavity, the clamping belt wheel cavity is internally provided with a clamping main belt wheel fixedly connected with the driven shaft, and a belt for clamping is connected between the clamping main belt wheel and the clamping driven belt wheel in a power fit manner.

On the basis of the technical scheme, the upper side of the speed changing cavity is provided with a motor which is positioned on the left side of the middle belt wheel cavity, the lower end surface of the motor is fixedly connected with a torque shaft which extends downwards, the lower end surface of the torque shaft is fixedly connected with a torque sensor, the lower end surface of the torque sensor is fixedly connected with a motor shaft which extends downwards into the speed changing cavity, the lower end of the lower side of the motor shaft is fixedly connected with a motor pinion which is positioned in the speed changing cavity, the speed changing cavity is internally provided with a motor gear which is fixedly connected with the motor shaft and positioned on the upper side of the motor pinion, the lower end of the lower side of the driven shaft is connected with a driven gear which is positioned in the speed changing cavity in a rotating fit manner, the driven gear is meshed with, the synchronizer side end face is connected with a sleeve in a rotating fit mode, a driven pinion which is connected with the driven shaft in a rotating fit mode and is located on the upper side of the synchronizer is arranged in the speed changing cavity, the driven pinion is meshed with the synchronizer, and the driven pinion is meshed with the motor gear wheel.

On the basis of the technical scheme, a sleeve connecting rod fixedly connected with the sleeve is arranged in the speed changing cavity, a connecting block is fixedly connected with the front end of the sleeve connecting rod in a sliding fit manner, an upper end face of the connecting block is fixedly connected with an upward extending upper connecting rod, the upper end face of the upper connecting rod is fixedly connected with a spring block in the spring cavity, the spring block is connected with the spring cavity in a sliding fit manner, a spring is fixedly connected between the upper end face of the spring cavity and the upper end face of the spring block, a lower connecting rod fixedly connected with a downward extending end face of the connecting block is connected with a lower end face of the lower connecting rod, a magnet in the magnet cavity is fixedly connected with a coil magnet on the lower end wall of the magnet cavity, a middle main belt wheel fixedly connected with the driven shaft is arranged in the middle belt wheel cavity, and an inner middle belt in the belt wheel cavity is connected with a middle belt in a rotating fit And (4) a wheel axle.

On the basis of the technical scheme, a middle secondary belt wheel fixedly connected with a middle belt wheel shaft is arranged in a middle belt wheel cavity, a middle belt is connected between the middle secondary belt wheel and the middle primary belt wheel in a power fit manner, a primary belt wheel for a fan fixedly connected with the middle belt wheel shaft is arranged in a belt wheel cavity for the fan, a driving conical gear shaft extending upwards into the belt wheel cavity for the fan and downwardly extending into the conical gear cavity is connected in a rotary fit manner in the lower end wall of the belt wheel cavity for the fan, a secondary belt wheel for the fan fixedly connected with the driving conical gear shaft is arranged in the belt wheel cavity for the fan, a belt for the fan is connected between the secondary belt wheel for the fan and the primary belt wheel for the fan in a power fit manner, a driving conical gear fixedly connected with the driving conical gear shaft is arranged in the conical gear cavity, and a driven conical gear fixedly connected with the fan shaft is arranged in the conical gear cavity, the driven bevel gear is meshed with the driving bevel gear, and a fan fixedly connected with the fan shaft is arranged in the fan cavity.

The invention has the beneficial effects that: the motor gear wheel drives the driven shaft to rotate through the driven pinion, and finally high-speed rotation of the low torque of the clamping shaft is achieved, so that quick clamping is achieved, machining efficiency is improved, after the clamping jaws contact a workpiece, gear shifting is achieved through the torque detector, the motor pinion drives the driven shaft to rotate through the driven gear wheel after gear shifting, and finally low-speed rotation of the high torque of the clamping shaft is achieved, so that low-speed clamping is achieved, chips are cleared through the work of the fan when clamping is conducted, and the positioning accuracy of clamping is improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a quick expanding and contracting auxiliary clamping device of the present invention;

FIG. 2 is a schematic sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic sectional view taken along line B-B in FIG. 1;

FIG. 4 is a schematic sectional view taken along the direction C-C in FIG. 1;

FIG. 5 is an enlarged view of the structure of FIG. 1 at D;

fig. 6 is an enlarged schematic view of the structure at E in fig. 1.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-6, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

As shown in fig. 1-6, the auxiliary clamping device for quick expansion and quick contraction of the device of the present invention comprises a lathe body 10, a chip cavity 11 with a forward opening is arranged in the lathe body 10, a three-jaw chuck cavity 14 is communicated with the left side of the chip cavity 11, a wide tooth cavity 43 is arranged on the upper side of the chip cavity 11, a fixture block moving cavity 40 extending upward is arranged on the upper side of the wide tooth cavity 43, a fixture block limiting cavity 38 is communicated with the upper side of the fixture block moving cavity 40, a fixture block cavity 36 is communicated with the upper side of the fixture block limiting cavity 38, a speed change cavity 24 is arranged on the left side of the wide tooth cavity 43, an entrainment wheel cavity 34 extending rightward and located on the left side of the fixture block moving cavity 40 is arranged on the upper side of the speed change cavity 24, a middle belt wheel cavity 51 extending rearward is arranged on the upper side of the entrainment wheel cavity 34, a spring cavity 53 located on the front side of the middle belt wheel cavity 51 is arranged on the upper, the lower side of the middle belt wheel cavity 51 is provided with a belt wheel cavity 47 extending rightwards for a fan, the rear side of the chip cavity 11 is communicated with a fan cavity 63, the rear side of the fan cavity 63 is provided with a conical tooth cavity 66, the upper end wall of the wide tooth cavity 43 is connected with an upper shaft sleeve 41 extending upwards to the lower end wall of the clamping block movement cavity 40 in a rotating fit mode, the lower end wall of the wide tooth cavity 43 is connected with a lower shaft sleeve 78 extending downwards to the upper end wall of the chip cavity 11 in a rotating fit mode, the lower shaft sleeve 78 is connected with a clamping shaft 44 extending upwards to penetrate through the wide tooth cavity 43 in a spline fit mode, the clamping block movement cavity 40 and the clamping block limiting cavity 38 extend downwards to the clamping block cavity 36, the clamping shaft 44 is connected with the upper shaft sleeve 41 in a spline fit mode, and a clamping block 37 fixedly connected with the clamping shaft 44 is arranged in the clamping block cavity 36.

In addition, in one embodiment, a ventilation pipe 73 is fixedly connected to the rear end wall of the chip chamber 11, a ventilation chamber 72 which is through from left front to right rear and can correspond to the fan chamber 63 is arranged in the ventilation pipe 73, a filter screen 69 is fixedly connected to the front end of the fan chamber 63, a fan shaft 68 which extends forward into the fan chamber 63 and extends backward into the bevel gear chamber 66 is rotatably and fittingly connected to the rear end wall of the fan chamber 63, a support plate 70 which is positioned on the left side of the ventilation pipe 73 is fixedly connected to the rear end wall of the chip chamber 11, a contact switch 71 is fixedly connected to the front end arc surface of the support plate 70, a main shaft 13 is rotatably and fittingly connected to the left end wall of the three-jaw chuck chamber 14, a three-jaw chuck 12 is fixedly connected to the right end surface of the main shaft 13, an inner hexagonal chamber 15 which is opened outward is arranged in the outer circular surface of the three-jaw chuck 12, three-jaw chucks 18 which are circumferentially distributed by, the outer end face of the clamping jaw 18 is fixedly connected with a contact block 17.

In addition, in one embodiment, the gear 42 for clamping is arranged in the wide gear cavity 43 and fixedly connected with the clamping shaft 44, the retraction cavity 74 with a downward opening is arranged in the end of the lower side of the clamping shaft 44, the connecting block 77 is fixedly connected with the end of the lower side of the clamping shaft 44, the thin rod cavities 76 are densely distributed in the connecting block 77, the thin rods 75 are connected in the thin rod cavities 76 in a sliding fit manner, the wide gear shaft 30 which extends downwards into the wide gear cavity 43 and extends upwards into the clamping wheel cavity 34 is connected in a sliding fit manner in the upper end wall of the wide gear cavity 43, the wide gear 16 which is fixedly connected with the wide gear shaft 30 is arranged in the wide gear cavity 43, the clamping slave belt pulley 39 which is fixedly connected with the wide gear shaft 30 is arranged in the clamping wheel cavity 34, the lower end wall of the clamping wheel cavity 34 is connected in a sliding fit manner and extends downwards into the speed change cavity 24 and extends backwards through the clamping wheel cavity 34 to the driven shaft 27 in the middle belt wheel cavity 51, the clamping belt wheel cavity 34 is internally provided with a clamping main belt wheel 33 fixedly connected with the driven shaft 27, and a clamping belt 35 is connected between the clamping main belt wheel 33 and the clamping driven belt wheel 39 in a power fit manner.

In addition, in an embodiment, the upper side of the speed changing cavity 24 is provided with a motor 19 located on the left side of the middle pulley cavity 51, the lower end surface of the motor 19 is fixedly connected with a torque shaft 20 extending downwards, the lower end surface of the torque shaft 20 is fixedly connected with a torque sensor 21, the lower end surface of the torque sensor 21 is fixedly connected with a motor shaft 22 extending downwards into the speed changing cavity 24, the tail end of the lower side of the motor shaft 22 is fixedly connected with a motor pinion 25 located in the speed changing cavity 24, the inside of the speed changing cavity 24 is provided with a motor gearwheel 23 fixedly connected with the motor shaft 22 and located on the upper side of the motor pinion 25, the tail end of the lower side of the driven shaft 27 is connected with a driven gearwheel 26 located in the speed changing cavity 24 in a rotating fit manner, the driven gearwheel 26 is engaged with the motor pinion 25, the inside of the speed changing cavity 24 is provided with a synchronizer, the end face of the side of the synchronizer 29 is connected with a sleeve 28 in a rotating fit mode, a driven pinion 31 which is connected with the driven shaft 27 in a rotating fit mode and is located on the upper side of the synchronizer 29 is arranged in the speed changing cavity 24, the driven pinion 31 is meshed with the synchronizer 29, and the driven pinion 31 is meshed with the motor gearwheel 23.

In addition, in one embodiment, a sleeve connecting rod 56 fixedly connected with the sleeve 28 is arranged in the speed changing cavity 24, a connecting block 55 is fixedly connected with the front end of the sleeve connecting rod 56, an upper connecting rod 54 extending upwards is fixedly connected with the upper end surface of the connecting block 55, a spring block 79 positioned in the spring cavity 53 is fixedly connected with the upper end surface of the upper connecting rod 54, the spring block 79 is connected with the spring cavity 53 in a sliding fit manner, a spring 52 is fixedly connected between the upper end wall of the spring cavity 53 and the upper end surface of the spring block 79, a lower connecting rod 57 extending downwards is fixedly connected with the lower end surface of the connecting block 55, a magnet 58 positioned in the magnet cavity 59 is fixedly connected with the lower end surface of the lower connecting rod 57, a coil magnet 60 is fixedly connected with the lower end wall of the magnet cavity 59, an intermediate main belt pulley 32 fixedly connected with the driven shaft 27 is arranged in, the lower end wall of the middle belt wheel cavity 51 is connected with a middle belt wheel shaft 48 which extends upwards into the middle belt wheel cavity 51 and downwards into the belt wheel cavity 47 for the fan in a rotating and matching way.

In one embodiment, an intermediate secondary pulley 49 fixedly connected to the intermediate pulley shaft 48 is provided in the intermediate pulley chamber 51, an intermediate belt 50 is connected between the intermediate secondary pulley 49 and the intermediate primary pulley 32 in a power-fit manner, a primary pulley 46 for a fan fixedly connected to the intermediate pulley shaft 48 is provided in the pulley chamber 47 for a fan, a primary cone gear shaft 62 extending upward into the pulley chamber 47 for a fan and downward into the cone gear chamber 66 is connected to the lower end wall of the pulley chamber 47 for a fan in a power-fit manner, a secondary pulley 61 for a fan fixedly connected to the primary cone gear shaft 62 is provided in the pulley chamber 47 for a fan, a fan belt 45 is connected between the secondary pulley 61 for a fan and the primary pulley 46 for a fan in a power-fit manner, a primary cone gear 67 fixedly connected to the primary cone gear shaft 62 is provided in the cone gear chamber 66, the bevel gear cavity 66 is internally provided with driven bevel gears 65 fixedly connected with the fan shaft 68, the driven bevel gears 65 are meshed with the driving bevel gears 67, and the fan cavity 63 is internally provided with a fan 64 fixedly connected with the fan shaft 68.

The applicant shall now specifically describe a quick-expanding and quick-contracting auxiliary clamping device of the present application with reference to fig. 1 to 6 and the above description: in the initial state, under the tension of the spring 52, the sleeve 28 is just meshed with the driven pinion 31; when a workpiece to be machined is ready to be clamped, the clamping shaft 44 is rotated to drive the clamping block 37 to rotate, the clamping block 37 can pass through the clamping block limiting cavity 38, so that the clamping shaft 44 is put down, the clamping gear 42 and the wide teeth 16 are just meshed at the moment, part of the thin rod 75 which is not blocked is inserted into the inner hexagonal cavity 15, the rest of the blocked thin rod 75 slides into the returning cavity 74, the matching of the inner hexagonal cavity 15 is completed at the moment, the motor is started to rotate forwardly to drive the torque shaft 20 to rotate, so that the motor shaft 22 is driven to rotate by the torque sensor 21, the motor shaft 22 drives the driven pinion 31 to rotate by the motor bull gear 23, meanwhile, the motor shaft 22 also drives the driven bull gear 26 to rotate by the motor pinion 25, at the moment, the driven bull gear 26 idles, the gear is a high-speed gear, the rotating speed of each shaft is high, but the torque is low, the driven shaft 27 drives the clamping main belt wheel 33 to rotate, so that the clamping belt wheel 35 and the clamping auxiliary belt wheel 39 drive the wide-tooth shaft 30 to rotate, the wide-tooth shaft 30 drives the clamping shaft 44 to rotate through the wide teeth 16 and the clamping gear 42, and the clamping shaft 44 controls the three-jaw chuck 12 in a rotating mode through the thin rod 75, so that the clamping jaws 18 are driven to slide towards a processed workpiece quickly, and preliminary quick clamping is achieved; when the jaws 18 touch a workpiece to be machined, the movement of the jaws 18 is subjected to resistance, so that the torque of each transmission shaft is increased, the torque sensor 21 can detect the torque, when the torque is increased to a certain value, the coil magnet 60 is electrified through the torque sensor 21, the coil magnet 60 attracts the magnet 58 to the upper end face of the coil magnet 60, so that the synchronizer 29 is disengaged from the driven pinion 31 and the synchronizer 29 is just meshed with the driven gearwheel 26, at the moment, the driven pinion 31 is idle, the gear is low, the rotating speed of the clamping shaft 44 is low, but the torque is high, the driven gearwheel 26 drives the driven shaft 27 to rotate through the synchronizer 29, finally the three-jaw chuck 12 is rotationally controlled to clamp the workpiece to be machined, and when the torque is increased to a set pre-tightening force, the motor 19 stops working; the driven shaft 27 drives the middle main belt wheel 32 to rotate, so that the middle belt wheel shaft 48 is driven to rotate through the middle belt 50 and the middle driven belt wheel 49, the middle belt wheel shaft 48 drives the fan main belt wheel 46 to rotate, the fan belt 45 and the fan driven belt wheel 61 drive the driving bevel gear shaft 62 to rotate, the driving bevel gear shaft 62 drives the driving bevel gear 67 to rotate, so that the driven bevel gear 65 drives the fan shaft 68 to rotate, the fan shaft 68 drives the fan 64 to rotate, the fan 64 performs dust collection and chip absorption work on the three-jaw chuck 12 through the filter screen 69 and the ventilation cavity 72, the chips are prevented from influencing the positioning precision of clamping, and the dust collection and chip absorption work and the clamping work are performed simultaneously; when the machining is completed and the clamping is removed, the rapid opening of the jaws 18 is achieved by the reverse rotation of the motor 19, and when the contact block 17 comes into contact with the contact switch 71, the motor 19 stops.

The invention has the beneficial effects that: the motor gear wheel drives the driven shaft to rotate through the driven pinion, and finally high-speed rotation of the low torque of the clamping shaft is achieved, so that quick clamping is achieved, machining efficiency is improved, after the clamping jaws contact a workpiece, gear shifting is achieved through the torque detector, the motor pinion drives the driven shaft to rotate through the driven gear wheel after gear shifting, and finally low-speed rotation of the high torque of the clamping shaft is achieved, so that low-speed clamping is achieved, chips are cleared through the work of the fan when clamping is conducted, and the positioning accuracy of clamping is improved.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.