CN219562661U - Telescopic rotary driving center part - Google Patents

Abstract

The utility model discloses a telescopic rotary driving tip component, which relates to the technical field of tip driving in mechanical polishing, and comprises a tip shaft, a sleeve and a spring, wherein one end of the sleeve is fixedly connected with a front cover, and a sealing seat is slidably arranged in the sleeve; one end of the top shaft sequentially passes through the sealing seat and the front cover and extends out of one end of the sleeve, the top shaft can rotate in the front cover and the sealing seat, the top shaft can axially slide in the front cover and the sealing seat, and the spring applies force to the top shaft in the direction of the front cover; an air pressure cavity is formed between the front cover and the sealing seat in the sleeve, an air flow channel is processed in the top shaft, one end of the air flow channel is communicated with the air pressure cavity, the other end of the air flow channel is communicated with the outside, a first shaft shoulder is arranged on the top shaft, and the first shaft shoulder is matched with one end of the sealing seat. The telescopic rotary driving center part not only has the center telescopic function, meets the requirements of quick and convenient workpiece replacement and clamping processes, but also can meet the rotary function requirement of center driving.

Description

Telescopic rotary driving center part

Technical Field

The utility model relates to the technical field of tip driving in mechanical polishing, in particular to a telescopic rotary driving tip part.

Background

In machining, when the rotary part is polished, in order to finish most of the surface of the part workpiece as one time as possible, so as to avoid surface shielding caused by excessive clamping, a center or a driving plate center is generally adopted to directly drive the workpiece to rotate. The driving center or the driving plate center commonly used in the prior art is either a power main shaft which cannot stretch or a center shaft which can stretch without rotary driving power. The device disclosed in the patent application CN202010125001.4, for example, comprises a quick-clamping and positioning driving tip part, which is carried out in two steps during operation: the method comprises the steps of firstly, primarily adjusting, and moving a quick tailstock sleeve to a pre-clamping position; and the other step is to fasten and clamp the sample by using an air cylinder. When the device processes samples in the same batch, the replacement and clamping of the samples can be completed only by executing the second step through the expansion and contraction of the cylinder piston rod, so that the clamping and positioning time of workpieces can be reduced, the processing efficiency of the whole batch of workpieces is improved, and the requirements of polishing and processing of most parts are met. However, because the tailstock of the center does not have rotary driving power, the rotation of the workpiece is driven in one direction only by the center with the spindle motor, when the workpiece is subjected to larger polishing force and the polishing force is opposite to the rotation direction of the workpiece, the workpiece can stop rotating, the workpiece is excessively polished locally, the machining size deviation is caused, and finally the workpiece in machining is scrapped.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides a telescopic rotary driving tip component which has a tip telescopic function, can realize quick positioning and clamping of a workpiece, and simultaneously has rotary driving power, so that the rotary driving tip component can be used with a live tip alone to drive the workpiece, can be used in pairs, and can provide twice of rotary power for the workpiece in a synchronous driving mode.

The aim of the utility model is realized by the following technical scheme:

a telescopic rotary driving tip component comprises a tip shaft, a sleeve and a spring, wherein one end of the sleeve is fixedly connected with a front cover, and a sealing seat is slidably arranged in the sleeve; one end of the top shaft sequentially penetrates through the sealing seat and the front cover and extends out of one end of the sleeve, the top shaft can rotate in the front cover and the sealing seat, the top shaft can axially slide in the front cover and the sealing seat, and the spring applies force to the top shaft in the direction of the front cover; an air pressure cavity is formed between the front cover and the sealing seat in the sleeve, an air flow channel is machined in the top shaft, one end of the air flow channel is communicated with the air pressure cavity, the other end of the air flow channel is communicated with the outside, a first shaft shoulder is arranged on the top shaft, and the first shaft shoulder is matched with one end of the sealing seat.

Further, the novel front cover comprises a rear cover, one end, far away from the front cover, of the top shaft penetrates through the rear cover, the top shaft is in clearance fit with the rear cover, a second shoulder is arranged on the top shaft, and the second shoulder is matched with one end of the rear cover.

Further, a front bearing is arranged in the front cover, an outer ring of the front bearing is in interference fit with an inner hole of the front cover, and the tip shaft is in small-clearance sliding fit with the inner ring of the front bearing.

Further, the sleeve is cylindrical, the outer circle of the sleeve and the inner hole are concentrically arranged, and the tip shaft is arranged on the axis of the sleeve.

Further, screw holes and positioning holes are formed in the two ends of the sleeve from outside to inside in sequence, external threads are formed in one end of the front cover and one end of the rear cover, the sleeve is connected with the front cover and the rear cover through threads respectively, and the end part of the front cover and the end part of the rear cover are matched with the two positioning holes in a sliding mode respectively.

Further, a round nut, a thrust bearing and a sealing cover are sequentially sleeved on the top shaft, the round nut is connected with the top shaft through threads, one end of the thrust bearing is abutted with one end of the round nut, the other end of the thrust bearing is abutted with one end of the sealing cover, and the other end of the sealing cover is abutted with one end of the sealing seat close to the front cover; the spring is in a compressed state, and two ends of the spring are respectively abutted against the sealing seat and the rear cover.

Further, a stop screw is connected to the round nut in a threaded manner, and the round nut and the tip shaft can be fixed relatively when the stop screw is screwed.

Further, an O-shaped ring is arranged between the front cover and the sleeve, and an air sealing ring is arranged between the front cover and the top shaft, between the top shaft and the sealing seat and between the sealing seat and the sleeve.

Further, the motor is installed to the one end that the back lid was kept away from the protecgulum, the rotor center of motor processes into the splined hole, the tip axle passes the one end processing of back lid has the integral key shaft, the integral key shaft with little clearance sliding fit in splined hole.

Further, one end of the tip shaft penetrating through the motor is connected with a rotary air seal joint, and the rotary air seal joint is used for enabling the air flow channel to be communicated with an external air source.

The beneficial effects of the utility model are as follows:

the telescopic rotary driving center part comprises a center shaft, a sleeve and a spring, wherein after a workpiece is clamped, the workpiece is tightly propped by the elasticity of the spring, and the clamping state is stable and reliable; one end of the sleeve is fixedly connected with a front cover, a sealing seat is slidably arranged in the sleeve, the tip shaft is rotatably arranged in the front cover and the rear cover, the rotation of the tip shaft is not limited, and the function of tip driving workpiece rotation can be realized by rotating the tip shaft after the workpiece is tightly propped. An air pressure cavity is formed between the front cover and the sealing seat, an air flow channel is formed in the top shaft, when high-pressure air is introduced into the air pressure cavity through the air flow channel, the sealing seat can be driven to slide and compress the spring, a first shaft shoulder is further arranged on the top shaft in the direction facing the sealing seat, and the top shaft can be driven to move continuously after the sealing seat contacts the first shaft shoulder, so that the retraction action of the top is completed; when high-pressure gas is not introduced into the gas flow channel, the pressure in the gas pressure cavity is reduced, the elastic force of the spring can push the tip shaft and the sealing seat to slide, and the tip can extend out to clamp a workpiece. The telescopic rotary driving center part meets the functional requirement that the center drives the workpiece to rotate, the whole workpiece is fast and convenient to replace and clamp, the clamping state is stable and reliable, and the machining process of the workpiece cannot be influenced due to instability of the air pressure system.

In the prior art, when the center is used for driving a workpiece to rotate, either the power main shaft cannot stretch or the center shaft can stretch without rotary driving power. The telescopic rotary driving center part has the center telescopic function and rotary driving power, not only can be used for driving a workpiece by being matched with the live center singly, but also can be used in a matched mode, and double rotary power is provided for the workpiece by adopting a synchronous driving mode, so that the situations of workpiece stalling and workpiece local excessive polishing caused by overlarge polishing force are avoided.

The sleeve is designed to be cylindrical, the outer circle of the sleeve is concentric with the inner hole, positioning holes are formed in the two ends of the sleeve and are connected with the front cover and the rear cover through threads, and the ends of the front cover and the rear cover are centered, so that the coaxial precision of the tip shaft and the sleeve is ensured, the outer cylinder of the sleeve can be directly used as a positioning shaft reference, and centering adjustment during workpiece clamping is more convenient; the air sealing rings are arranged between the top shaft and the front cover, between the top shaft and the sealing seat, and between the sealing seat and the sleeve, when the top needs to retract, high-pressure air is introduced into the air pressure cavity, so that each air sealing ring can be inflated and expanded, and a good sealing effect is achieved; when the tip is tightly propped up and the workpiece is driven to rotate, the pressure in the air pressure cavity is lower, and at the moment, each air sealing ring is exhausted and contracted, so that excessive abrasion caused by the rotated tip shaft can be effectively avoided.

Drawings

FIG. 1 is a schematic cross-sectional view of a retractable rotationally driven tip assembly of the present utility model with the workpiece unvented and untapped;

fig. 2 is a schematic cross-sectional view of a retractable rotary drive tip assembly of the present utility model after venting;

FIG. 3 is a schematic cross-sectional view of a retractable rotationally driven tip assembly of the present utility model when used to tighten a workpiece;

fig. 4 is a schematic view of an exploded construction of a retractable rotary drive tip assembly according to the present utility model;

in the figure, the structure comprises a 1-top shaft, a 2-front cover, a 3-small sealing ring, a 4-O-shaped ring, a 5-front bearing, a 6-stop screw, a 7-round nut, an 8-sealing cover, a 9-thrust bearing, a 10-middle sealing ring, an 11-sealing seat, a 12-large sealing ring, a 14-spring, a 15-rear cover, a 16-rotor, a 17-motor, a 23-rotary air seal joint, a 25-sleeve and a 40-workpiece.

Detailed Description

The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.

As shown in fig. 1 to 4, a telescopic rotary drive tip assembly comprises a tip shaft 1, a sleeve 25 and a spring 14. Wherein, one end of the sleeve 25 is fixedly connected with the front cover 2, and a sealing seat 11 is slidably arranged in the sleeve 25; the tip shaft 1 has a tip formed or mounted at one end thereof, and extends beyond one end of the sleeve 25 after passing through the seal seat 11 and the front cover 2 in order. The above-mentioned tip shaft 1 is rotatable in the front cover 2 and the seal holder 11, and is also axially slidable in the front cover 2 and the seal holder 11. The spring 14 applies a force in the direction of the front cover 2 to the tip shaft 1. An air pressure cavity is formed in the sleeve 25 in the area between the front cover 2 and the sealing seat 11, an air flow channel is processed in the top shaft 1, one end of the air flow channel is communicated with the air pressure cavity, and the other end of the air flow channel is communicated with the outside; a first shoulder is also provided on the spindle towards the sealing seat 11, which first shoulder is adapted to one end of the sealing seat 11.

After clamping the workpiece 40, the telescopic rotary driving center part can tightly press the workpiece 40 through the elasticity of the spring 14, so that the clamping is stable and reliable; when the driving device drives the center shaft 1 to rotate, the center of the workpiece 40 can be tightly propped to directly drive the workpiece 40 to rotate, so that the processing procedures of grinding, polishing and the like are completed. When the workpiece 40 needs to be replaced, high-pressure gas can be continuously introduced into one end of the airflow channel, and after the high-pressure gas enters the air pressure cavity through the airflow channel, the sealing seat 11 can be pushed to slide in a direction away from the front cover 2; when the sealing seat 11 slides a certain distance and then contacts with a first shaft shoulder of the tip shaft 1, the tip shaft 1 can be pushed to move together by the first shaft shoulder along with the continuous sliding of the sealing seat 11, and at the moment, the spring 14 is compressed and the retraction action of the tip is completed; when a new workpiece 40 is replaced, high-pressure gas is not introduced into the gas flow channel, the pressure in the gas pressure cavity is reduced at the moment, the elastic force of the spring 14 can push the tip shaft 1 and the sealing seat 11 to reversely slide, so that the tip stretches out until the tip tightly abuts against the workpiece 40, the clamping is completed, and the whole workpiece replacement and clamping process is rapid and convenient.

In particular embodiments, the telescopic rotary drive tip assembly further comprises a rear cover 15, the end of the tip shaft 1 remote from the front cover 2 passing through the rear cover 15. The tip shaft 1 is in clearance fit with the rear cover 15, so that the tip shaft 1 can rotate in the rear cover 15 to ensure the design requirement of the tip rotation driving function, and meanwhile, the tip shaft 1 can also slide in the rear cover 15 along the axial direction to ensure the design requirement of the tip telescopic function. The second shoulder is arranged on the top shaft 1 and is matched with one end of the rear cover, in the top retraction process, when the second shoulder abuts against the rear cover 15, the top shaft 1 and the sealing seat 11 stop sliding, and the second shoulder and the rear cover 15 arranged at the position can effectively limit the retraction stroke of the top. It should be noted that the limiting function may be implemented in various manners, and in addition to the above-mentioned physical rigid limiting manner through the second shoulder, the retraction stroke of the tip may be controlled by controlling the ventilation time or ventilation pressure of the high-pressure gas.

Further, a front bearing 5 is arranged in the front cover 2, an outer ring of the front bearing 5 is in interference fit with an inner hole of the front cover, and a small clearance sliding fit is formed between the tip shaft 1 and an inner ring of the front bearing 5, so that the tip shaft 1 can rotate in the front cover 2 to ensure the design requirement of a tip rotation driving function, and meanwhile, the tip shaft 1 can also slide in the front cover 2 along the axial direction to ensure the design requirement of a tip telescopic function.

Since the centering of the workpiece is extremely important to ensure the machining accuracy when the clamping is performed, the portion of the tip shaft 1 itself extending out is short, and it is difficult to perform the centering operation of the part directly through the tip shaft 1. Therefore, the sleeve 25 is designed to be cylindrical, the outer circle and the inner hole of the sleeve 25 are concentrically arranged, the tip shaft 1 is arranged on the axis of the sleeve 25, and the sleeve 25 can be used as a positioning shaft reference when the workpiece 40 is clamped, so that the centering adjustment of the workpiece 40 is completed.

In a specific implementation, both ends of the sleeve 25 are sequentially provided with a threaded hole and a positioning hole from outside to inside, and one end of the front cover 2 and one end of the rear cover 15 are respectively provided with external threads. The two ends of the sleeve 25 are respectively connected with the front cover 2 and the rear cover 15 through threads, the end part of the front cover 2 and the end part of the rear cover 15 are respectively in sliding fit with the two positioning holes, and the coaxial precision between the assembled sleeve 25 and the front cover 2 and the assembled sleeve 15 are ensured through the sliding fit; according to the above, the assembling of the front bearing 5 and the front shaft 1 is performed by sliding fit with a small gap (micron order), so that the coaxial precision of the outer cylinder of the sleeve 25 and the front shaft 1 can be effectively ensured after the assembling of the whole structure is completed.

The aforementioned mounting of the spring 14 can be implemented in various configurations, only by making it possible to apply a force in the direction of the front cover 2 to the tip shaft 1, so as to fulfill the function of the tip part. In this embodiment, a round nut 7, a thrust bearing 9 and a sealing cover 8 are further sleeved on the tip shaft 1 in sequence. The round nut 7 is connected with the tip shaft 1 through threads, one end of the thrust bearing 9 is abutted with one end of the round nut 7, the other end of the thrust bearing 9 is abutted with one end of the sealing cover 8, and the other end of the sealing cover 8 is abutted with one end, close to the front cover, of the sealing seat 11; the spring 14 is in a compressed state, and both ends of the spring 14 are respectively abutted against the seal seat 11 and the rear cover 15. In the above arrangement, the elastic force of the compressed spring 14 is transmitted to the tip shaft 1 via the seal seat 11, the seal cover 8, the thrust bearing 9, and the round nut 7 in this order, and a force in the direction of the front cover 2 is applied to the tip shaft 1.

When the workpiece 40 is not pressed tightly and is not ventilated, as shown in fig. 1, the round nut 7 is pressed against the inner ring of the front bearing 5 under the action of the elastic force of the spring 14, and the center is extended to the longest position; after the high-pressure gas is introduced, as shown in fig. 2, the sealing seat 11 slides to drive the tip shaft 1 to move backward until the tip reaches the shortest position, the sealing seat 11 abuts against a first shoulder of the tip shaft 1, and a second shoulder of the tip shaft 1 abuts against the rear cover 15. The distance between the longest extending position and the shortest extending position of the tip is the telescopic stroke of the tip of the component. When the workpiece 40 is tightly propped, as shown in fig. 3, the center is located in the middle area of the telescopic travel because the workpiece 40 needs to be tightly propped, and at this time, gaps exist between the round nut 7 and the front bearing 5, between the sealing seat 11 and the first shaft shoulder of the tip shaft 1, and between the second shaft shoulder of the tip shaft 1 and the rear cover 15 because of the specific structural design, and contact wear can be effectively avoided in the process that the rear center drives the workpiece to rotate.

Further, the round nut 7 is further connected with a stop screw 6 through threads, and when the stop screw 6 is screwed, the front end of the stop screw can relatively fix the round nut 7 and the tip shaft 1, so that the condition that threads of the round nut 7 are loosened in the rotation process of the tip shaft 1 is avoided.

In the retractable rotary driving tip assembly, the retraction of the tip is realized pneumatically, so that the sealing performance of the air pressure cavity needs to be fully considered. In the embodiment, the front cover 2 is connected with the sleeve 25 through threads, and the static sealing effect of the front cover can be ensured through the O-shaped ring 4. A small sealing ring 3 is arranged between the tip shaft 1 with relative movement and the front cover 2, a middle sealing ring 10 is arranged between the tip shaft 1 and the sealing seat 11, and a large sealing ring 12 is arranged between the sealing seat 11 and the sleeve 25. The small sealing ring 3, the middle sealing ring 10 and the large sealing ring 12 are all air sealing rings, when the center needs to retract, high-pressure oil mist gas is introduced into the air pressure cavity, so that each air sealing ring can be inflated, and a good sealing effect is achieved; when the tip is tightly propped up and the workpiece is driven, the pressure in the air pressure cavity is low, and at the moment, each air sealing ring is exhausted and contracted, so that the residual oil mist can reduce friction, and excessive abrasion caused by the rotated tip shaft 1 can be effectively avoided.

Further, the telescopic rotary drive tip assembly is provided with a motor 17. The motor 17 is integrally arranged at one end of the rear cover 15 far away from the front cover, the center of the rotor 16 of the motor 17 is processed into a spline hole, one end of the tip shaft 1 penetrating through the rear cover is processed into a spline shaft, the spline shaft is matched with the spline hole, the tip shaft 1 can be directly driven to rotate by starting the motor 17 to realize the function of driving the tip, and meanwhile, the spline shaft can slide in the spline hole and cannot influence the telescopic function of the tip. It should be noted that, when the motor 17 is integrally provided, the spline shaft and the spline hole cooperate to perform a good centering function on the rear end of the spindle 1, and at this time, the front end and the rear end of the spindle 1 are ensured by the centering accuracy of the front bearing 5 and the rotor 16, respectively, and the positioning spigot on the rear cover 15 for mounting the motor and the front end of the external thread for the connecting sleeve 25 must be concentrically machined during machining, so as to ensure the centering accuracy requirement.

Further, a rotary air seal joint 23 is connected to one end of the spindle 1 passing through the motor 17, and the rotary air seal joint 23 is commercially available and is used for communicating the air flow passage with an external air source.

The retractable rotary drive tip assembly can be used alone in combination with a live tip, wherein the workpiece being processed obtains a drive torque less than the output of a motor. Or two pairs of the two pairs can be used to respectively prop against the center holes at the left end and the right end of the workpiece 40. When the pair is used, two synchronous motors (one for forward rotation and one for reverse rotation) are adopted, and a synchronous driving mode is adopted, so that the machined workpiece obtains twice driving torque, and the workpiece slipping phenomenon when the external polishing force is increased can be effectively prevented.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (10)

1. The telescopic rotary driving tip component is characterized by comprising a tip shaft, a sleeve and a spring, wherein one end of the sleeve is fixedly connected with a front cover, and a sealing seat is slidably arranged in the sleeve;

one end of the top shaft sequentially penetrates through the sealing seat and the front cover and extends out of one end of the sleeve, the top shaft can rotate in the front cover and the sealing seat, the top shaft can axially slide in the front cover and the sealing seat, and the spring applies force to the top shaft in the direction of the front cover;

an air pressure cavity is formed between the front cover and the sealing seat in the sleeve, an air flow channel is machined in the top shaft, one end of the air flow channel is communicated with the air pressure cavity, the other end of the air flow channel is communicated with the outside, a first shaft shoulder is arranged on the top shaft, and the first shaft shoulder is matched with one end of the sealing seat.

2. A telescopic rotary drive tip assembly according to claim 1, further comprising a rear cover through which an end of the tip shaft remote from the front cover passes, the tip shaft being in clearance fit with the rear cover, a second shoulder being provided on the tip shaft, the second shoulder being adapted to an end of the rear cover.

3. A telescopic rotary drive tip assembly according to claim 2, wherein a front bearing is provided in the front cover, an outer race of the front bearing being in an interference fit with an inner bore of the front cover, and the tip shaft being in a small clearance sliding fit with an inner race of the front bearing.

4. A telescopic rotary drive tip assembly according to claim 3, wherein the sleeve is cylindrical, the outer circumference of the sleeve being concentric with the inner bore, the tip shaft being arranged on the axis of the sleeve.

5. The retractable rotary drive tip assembly according to claim 4, wherein threaded holes and positioning holes are formed in sequence from outside to inside at both ends of said sleeve, external threads are formed at one end of said front cover and one end of said rear cover, said sleeve is respectively screwed to said front cover and said rear cover, and said front cover end and said rear cover end are respectively slidably engaged with said positioning holes.

6. The telescopic rotary driving tip component according to claim 2, wherein the tip shaft is further sleeved with a round nut, a thrust bearing and a sealing cover in sequence, the round nut is connected with the tip shaft through threads, one end of the thrust bearing is abutted with one end of the round nut, the other end of the thrust bearing is abutted with one end of the sealing cover, and the other end of the sealing cover is abutted with one end of the sealing seat close to the front cover; the spring is in a compressed state, and two ends of the spring are respectively abutted against the sealing seat and the rear cover.

7. A telescopic rotary drive tip assembly according to claim 6, wherein said round nut is threadably connected to a set screw which secures said round nut and said tip shaft relative to each other when tightened.

8. A telescopic rotary drive tip assembly according to claim 1, wherein an O-ring is arranged between the front cover and the sleeve, and an air-seal ring is arranged between the tip shaft and the front cover, between the tip shaft and the seal seat, and between the seal seat and the sleeve.

9. A telescopic rotary drive tip assembly according to claim 2, wherein the end of the rear cover remote from the front cover is fitted with a motor, the centre of the rotor of which is machined with a splined bore, the end of the tip shaft passing through the rear cover is machined with a splined shaft which is in a small clearance sliding fit with the splined bore.

10. A retractable rotationally driven tip assembly according to claim 9, wherein the tip shaft is connected at one end through the motor to a rotary air seal fitting for communicating the air flow passage with an external air source.