CN115740535A - Automatic internal-bracing expansion device capable of ensuring concentricity - Google Patents

Abstract

The invention discloses an automatic inner supporting and expanding device capable of ensuring concentricity, which comprises: the inner supporting core is fixed at the top of the base, the core is arranged at the upper end of the inner supporting core, and the diameter of the core gradually increases from one end where the top of the core is located to the other end of the core to form a vertebral body part; the inner expanding sleeve is provided with an expanding disc part, an expanding sleeve part and a conical hole penetrating through the expanding disc part and the expanding sleeve part, and the cone part is inserted and attached in the conical hole; the expansion sleeve part is divided into a plurality of expansion claw parts, and the expansion claw parts can elastically deform; the driving device is connected to the expansion disc portion in a transmission mode, the inner support expansion sleeve can be pulled to move downwards relative to the inner support core, and the expansion claw portions are enabled to expand outwards synchronously under the pushing resistance of the vertebral body portion. The invention adopts the mode that the inner support core is fixed and pulls the inner support expansion sleeve, so that the whole expansion sleeve part of the inner support expansion sleeve is more uniformly expanded outwards, the inner support core is not easy to wear, and the concentricity for positioning the workpiece can be effectively ensured.

Description

Automatic internal-bracing expansion device capable of ensuring concentricity

Technical Field

The invention relates to the technical field of workpiece clamping devices, in particular to an automatic inner supporting and expanding device capable of ensuring concentricity.

Background

For machining the outer circumference of some tubular parts such as bushings, an inner expanding sleeve is usually used to support the inner bore of the part so that the outer circumference is not shielded and is completely exposed, thereby machining the outer circumference.

The clamping tool for processing the gear shaft, disclosed by the invention patent with the application date of 2019, 11 and 26 and the application publication number of CN110842616A in China, comprises a clamping disc, a supporting base, a telescopic cylinder, a pull rod, an expansion sleeve and a supporting cylinder of a processing center, wherein the conical end of the pull rod is matched with a conical hole of the expansion sleeve, the expansion sleeve is applied with component force towards the clamping disc, the expansion sleeve is uniformly expanded in diameter integrally, the expansion sleeve is in interference fit with an inner hole of a gear shaft blank, and the gear shaft blank is axially and radially positioned. Although the technical scheme disclosed in the above patent can realize the effect of expanding and tightening the inner support of the workpiece, the following defects still exist at least: 1) Force is applied to the pull rod to expand the expansion sleeve, and after the expansion sleeve is used for a long time, the conical end of the pull rod is abraded seriously and is easy to deform, so that the concentricity for positioning the workpiece is inaccurate, and the subsequent processing quality of the workpiece cannot be guaranteed; 2) The expanded part is only one end part of the expansion sleeve, the interference fit area of the expansion sleeve and the inner hole of the workpiece is small, and the concentricity is difficult to ensure; 3) The method has higher processing precision requirement on the open slot of the expansion sleeve, if the open slot on the expansion sleeve has deviation, each part of the expansion sleeve divided by the open slot is stressed unevenly, and the expansion amount can not be ensured.

Disclosure of Invention

In order to solve the technical problem, the invention provides an automatic inner support expansion device capable of ensuring the concentricity, which adopts a mode that an inner support core is fixed and an inner support expansion sleeve is pulled, so that the whole expansion sleeve part of the inner support expansion sleeve is more uniformly expanded outwards, the interference fit area with an inner hole of a workpiece is large, the inner support core is not easy to wear, and the concentricity for positioning the workpiece can be effectively ensured.

The technical scheme adopted by the invention for solving the technical problem is as follows: an automatic inner bracing expansion device capable of guaranteeing concentricity, comprising: the inner support core is fixed at the top of the base, the upper end of the inner support core is provided with a core, and the diameter of the core is gradually increased from one end of the top of the core to the other end of the core, so that a vertebral body part is formed; the inner support expansion sleeve is provided with an expansion disc part, an expansion sleeve part integrally connected to the center of the top end of the expansion disc part and a conical hole penetrating through the expansion disc part and the expansion sleeve part, the size of the conical hole is matched with that of the cone part, and the cone part is inserted and attached in the conical hole; the expansion sleeve part is divided into a plurality of expansion claw parts which are distributed in an annular equal interval manner, and the expansion claw parts can elastically deform; the driving device is in transmission connection with the disc expansion portion and can pull the inner support expansion sleeve to move downwards relative to the inner support core, so that the expansion claw portions are synchronously expanded outwards under the pushing resistance of the vertebral body portion.

As a further improvement of the invention, the inner support core is also provided with a mounting seat, and the core is formed by extending the top of the mounting seat upwards along the axis; the inner support core is fixed in a mounting hole formed in the top of the base through the mounting seat, the expansion disc portion is located above the mounting seat, and a gap for the inner support expansion sleeve to move is reserved between the inner support core and the expansion disc portion.

As a further improvement of the invention, a stepped hole communicated with the mounting hole is arranged at the bottom of the base, a piston piece capable of sliding up and down is arranged in the stepped hole, the piston piece is fixedly connected with the expansion disc part through a plurality of fixing bolts, and the driving device drives the inner support expansion sleeve to reciprocate up and down through the piston piece.

As a further improvement of the invention, a plurality of through holes for the fixing bolts to correspondingly penetrate are vertically arranged on the mounting seat, and a guide sleeve sleeved on the corresponding fixing bolt is arranged in each through hole.

As a further improvement of the invention, the fixing bolts are equal-height screws which are distributed on the expansion disc part in a ring shape at equal intervals.

As a further improvement of the present invention, a plurality of first dividing grooves and a plurality of second dividing grooves are radially and equally spaced on the inner expanding sleeve, the plurality of first dividing grooves all extend from the top end of the expanding sleeve portion to the middle of the expanding disc portion, the plurality of second dividing grooves all extend from the bottom end of the expanding disc portion to the position close to the top end of the expanding sleeve portion, and the plurality of first dividing grooves and the plurality of second dividing grooves are distributed on the circumference of the inner expanding sleeve in a staggered manner at intervals.

As a further improvement of the invention, the device also comprises an upper cover which is fixed on the top of the base and covers the inner support core and part of the inner support expansion sleeve; the upper cover is provided with a limiting hole, and the expansion sleeve part and the vertebral body part penetrate through the limiting hole and extend upwards.

As a further improvement of the invention, the top end of the upper cover is provided with a positioning boss around the outer side of the limiting hole.

As a further improvement of the invention, the lower end of the core is provided with a cylindrical part, the cone part is integrally connected to the top end of the cylindrical part, and the diameter of the lower end of the cone part is consistent with that of the cylindrical part.

As a further improvement of the invention, the upper end surface of the cone part is not lower than the upper end surface of the expansion sleeve part.

The invention has the beneficial effects that:

1) The invention provides an automatic inner supporting expansion device capable of ensuring concentricity, wherein an inner supporting core is fixed on a base, an inner supporting expansion sleeve is sleeved on a core of the inner supporting core, a plurality of fixing bolts are adopted to pull the inner supporting expansion sleeve to move downwards relative to the inner supporting core, the pulling force applied to the inner supporting expansion sleeve is more uniform and stable, and expansion claw parts on the inner supporting expansion sleeve are enabled to synchronously and uniformly expand outwards under the action force of a centrum part of the core and are in interference fit in an inner hole of a workpiece to position the workpiece, and the concentricity for positioning the workpiece can be effectively ensured;

2) The cone part of the inner support core is attached to the tapered hole of the whole inner support expansion sleeve, the contact area is large, the acting force applied to the cone part can be dispersed, and the cone part is not easy to wear and deform;

3) The whole expansion sleeve part can be uniformly expanded outwards under the pushing resistance of the cone part, the interference fit area with the inner hole of the workpiece is large, and the concentricity for positioning the workpiece is further ensured;

4) The expansion stroke range is limited through the upper cover, and the phenomenon that the expansion is too large and the workpiece is damaged is avoided.

Drawings

FIG. 1 is a perspective view of an automatic internal bracing and expanding device of the present invention capable of ensuring concentricity;

FIG. 2 is an exploded view of the automatic inner bracing and expansion device of the present invention for ensuring concentricity;

FIG. 3 is a cross-sectional view of the automatic internal stay expanding device of the present invention for ensuring concentricity;

FIG. 4 is a perspective view of an inner support expansion sleeve of the automatic inner support expansion device of the present invention for ensuring concentricity;

FIG. 5 is a half-sectional perspective view of an inner support expanding sleeve of the automatic inner support expanding device capable of ensuring concentricity according to the present invention;

FIG. 6 is a perspective view of an inner support core of the automatic inner support expansion device of the present invention, which can ensure concentricity.

The following description is made with reference to the accompanying drawings:

1. a base; 11. mounting holes; 12. a stepped hole; 2. an inner supporting core; 21. a core; 211. a vertebral body portion; 212. a cylindrical portion; 22. a mounting seat; 221. a through hole; 3. an inner support expansion sleeve; 31. expanding the disc part; 32. a sleeve expanding part; 321. a claw expanding part; 33. a tapered hole; 34. a first dividing groove; 35. a second dividing groove; 4. a piston member; 5. fixing the bolt; 6. a guide sleeve; 7. an upper cover; 71. a limiting hole; 72. and (5) positioning the boss.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 6, the present invention provides an automatic inner bracing and expanding device capable of ensuring concentricity, including: the device comprises a base 1, an inner support core 2, an inner support expansion sleeve 3, a piston piece 4, a plurality of fixing bolts 5, a plurality of guide sleeves 6, an upper cover 7 and a driving device (not shown in the figure). The base 1 is cylindrical, a flange part is arranged on the outer ring of the bottom of the base 1, and the base 1 is fixed on an external lathe through the flange part; after the workpiece to be processed is positioned by the inner supporting expansion device, the workpiece to be processed integrally rotates under the driving of the external lathe, and then the outer circumferential surface of the workpiece can be processed.

The top of the base 1 is provided with a mounting hole 11 along the axis, and the mounting hole 11 is an internal threaded hole; the bottom of base 1 is provided with shoulder hole 12 along the axis, and shoulder hole 12 and mounting hole 11 intercommunication, and the internal diameter of shoulder hole 12 is greater than the internal diameter of mounting hole 11.

Further, the inner supporting core 2 is fixed on the top of the base 1. The inner support core 2 is provided with a core 21 and a mounting seat 22, the core 21 is positioned at the upper part, the mounting seat 22 is positioned at the lower part, and specifically, the core 21 is formed by extending upwards along the axis from the top of the mounting seat 22. The outer circumference of the mounting seat 22 is provided with an external thread, and the inner support core 2 is connected in the mounting hole 11 through the mounting seat 22 thread to be fixed with the base 1.

Wherein, mounting hole 11 is provided with the chamfer around the upper end edge, and the increase of the upper end external diameter of mount pad 22 forms annular bulge, and annular bulge's bottom is provided with the inclined plane that matches with the chamfer. The mounting seat 22 is screwed into the mounting hole 11 until the bottom of the annular protrusion of the mounting seat 22 abuts against the chamfer of the mounting hole 11, indicating that the inner support core 2 is mounted in place.

Referring to fig. 6, the core 21 has a diameter gradually increasing from one end thereof where the top is located toward the other end, thereby forming a cone portion 211; the lower end of the core 21 is provided with a cylindrical portion 212, the tapered portion 211 is integrally connected to the top end of the cylindrical portion 212, and the diameter of the lower end of the tapered portion 211 is identical to the diameter of the cylindrical portion 212.

Referring to fig. 4 and 5, the inner expanding sleeve 3 is provided with an expanding disc portion 31, an expanding sleeve portion 32 integrally connected to the center of the top end of the expanding disc portion 31, and a tapered hole 33 penetrating through the expanding disc portion 31 and the expanding sleeve portion 32. The expansion sleeve part 32 is used for placing and expanding a workpiece, the outer diameter of the expansion sleeve part is slightly smaller than the inner diameter of the workpiece to be processed, and the outer diameter of the expansion disc part 31 is far larger than the outer diameter of the expansion sleeve part 32.

In addition, but not limited to, four first dividing grooves 34 and four second dividing grooves 35 are arranged on the inner expanding sleeve 3 at equal intervals in the radial direction, and the four first dividing grooves 34 extend downwards from the top end of the expanding sleeve portion 32 to the middle of the expanding disc portion 31, so that the expanding sleeve portion 32 is divided into four expanding claw portions 321 which are distributed in an annular shape at equal intervals. The four second dividing grooves 35 extend upwards from the bottom end of the expanding disc portion 31 to the top end close to the expanding sleeve portion 32, and the four first dividing grooves 34 and the four second dividing grooves 35 are distributed on the circumference of the inner support expanding sleeve 3 at intervals in a staggered manner.

In this embodiment, the inner expanding sleeve 3 is made of, but not limited to, a spring steel material, so that the four expanding claw portions 321 can be elastically deformed and expanded outwards, and can also be folded inwards and restored by means of its own elastic force.

Referring to fig. 3, the inner expanding sleeve 3 is sleeved on the core 21, the disk expanding portion 31 is located above the mounting seat 22, and a gap is left between the disk expanding portion 31 and the mounting seat 22 for the inner expanding sleeve 3 to move downward. The size of the tapered hole 33 in the inner expanding sleeve 3 is matched with that of the cone part 211, and the cone part 211 is inserted in the tapered hole 33 and is attached to the inner wall of the tapered hole 33. In this embodiment, the upper end surface of the vertebral body portion 211 is not lower than the upper end surface of the expansion sleeve portion 32, the contact area between the vertebral body portion 211 and the inner expanding sleeve 3 can be increased as much as possible, and when the inner expanding sleeve 3 moves downward relative to the inner expanding core 2, the whole expansion sleeve portion 32 can be expanded outward by the acting force of the vertebral body portion 211, and the stress is more uniform. Of course, it would be acceptable for the upper end surface of the vertebral body 211 to be slightly lower than the upper end surface of the expansion 32.

Furthermore, the piston member 4 is cylindrical, the outer diameter of the piston member is matched with the inner diameter of the stepped hole 12, the piston member 4 is slidably mounted in the stepped hole 12, and the piston member 4 is fixedly connected with the expansion disc portion 31 through a plurality of fixing bolts 5.

In this embodiment, the fixing bolts 5 are equal-height screws, but are not limited to four, and are annularly and equidistantly distributed on the expansion disc portion 31. Specifically, expand that disc portion 31 goes up the annular equidistant four counter bores that are provided with, the screw thread place one end of four fixing bolt 5 passes corresponding counter bore and mount pad 22 and locks on piston spare 4, and the head one end of four fixing bolt 5 ends and ends in the counter bore, and then will prop the bloated cover 3 and fix with piston spare 4 in.

It should be noted that, in the present application, a 1mm gap is left between one end of the head of the fixing bolt 5 and the inner wall of the counter bore, and at the same time, the bottom surface of the inner expanding sleeve 3 sleeved on the core 21 extends downward to the outer side of the cylindrical portion 212, and the tapered hole 33 is provided with a fillet along the lower end edge thereof, so as not to contact with the cylindrical portion 212.

In addition, the installation seat 22 is vertically provided with four through holes 221 for the four fixing bolts 5 to pass through one to one, a guide sleeve 6 sleeved on the corresponding fixing bolt 5 is installed in each through hole 221, the upper end and the lower end of the guide sleeve 6 are respectively abutted to the bottom surface of the expansion disc portion 31 and the top surface of the piston piece 4, on one hand, the stability of the up-and-down movement of the inner expanding sleeve 3 can be improved through the guide sleeve 6, and on the other hand, the installation accuracy of the inner expanding sleeve 3 and the piston piece 4 can be ensured.

Referring to fig. 1 and 2, the upper cover 7 is fixed to the top of the base 1 by bolts, and covers the inner supporting core 2 and the inner supporting expansion sleeve 3, so as to prevent foreign matters from falling between the inner supporting core 2 and the inner supporting expansion sleeve 3. The top center of the upper cover 7 is provided with a limiting hole 71, the inner diameter of the limiting hole 71 is slightly larger than the outer diameter of the expansion sleeve part 32, the expansion sleeve part 32 and the vertebral body part 211 penetrate through the limiting hole 71 and extend upwards, the expansion stroke range of the expansion sleeve part 32 is limited through the limiting hole 71, and the phenomenon that the expansion is too large and the workpiece is damaged is avoided. A plurality of positioning bosses 72 are provided at the top end of the upper cover 7 around the outside of the limit hole 71, for positioning a workpiece placed on the expansion sleeve portion 32.

In this embodiment, the driving device is a hydraulic cylinder, and is fixedly connected with the piston member 4 through a pull rod, and then the driving device drives the inner support expansion sleeve 3 to reciprocate up and down through the piston member 4.

When the driving device drives the piston piece 4 to move downwards, the piston piece 4 pulls the inner support expansion sleeve 3 to move downwards relative to the inner support core 2 through the four fixing bolts 5, so that the four expansion claw parts 321 synchronously expand outwards under the pushing resistance of the cone part 211 and are in interference fit in an inner hole of a workpiece to position the workpiece.

When the driving device drives the piston piece 4 to move upwards, the piston piece 4 pushes the inner support expansion sleeve 3 to move upwards relative to the inner support core 2 through the four fixing bolts 5, so that the four expansion claw parts 321 are folded inwards and restored by means of self elasticity, and the workpiece is loosened.

Therefore, the automatic inner-supporting expansion device capable of ensuring concentricity is characterized in that the inner-supporting core 2 is fixed on the base 1, the inner-supporting expansion sleeve 3 is sleeved on the core 21 of the inner-supporting core 2, the inner-supporting expansion sleeve 3 is pulled to move downwards relative to the inner-supporting core 2 by the aid of the plurality of fixing bolts 5, tension on the inner-supporting expansion sleeve 3 is more uniform and stable, the expansion claw parts 321 on the inner-supporting expansion sleeve 3 are expanded outwards and uniformly under the action force of the cone part 211 of the core 21, the inner-supporting expansion device is in interference fit in an inner hole of a workpiece to position the workpiece, and concentricity for positioning the workpiece can be effectively ensured; the cone part 211 of the inner support core 2 is attached to the tapered hole 33 of the whole inner support expansion sleeve 3, the contact area is large, the acting force applied to the cone part 211 can be dispersed, and the abrasion and the deformation are not easy to occur; the whole expansion sleeve part 32 can be expanded outwards uniformly under the pushing resistance of the cone body part 211, the area of the expansion sleeve part in interference fit with the inner hole of the workpiece is large, and the concentricity for positioning the workpiece is further ensured.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms than described herein, and therefore the invention is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims (10)

1. An automatic internal stay tensioning device that can guarantee concentricity which characterized in that includes:

a base (1);

the inner supporting core (2) is fixed at the top of the base (1); the upper end of the inner support core (2) is provided with a core (21), and the diameter of the core (21) is gradually increased from one end where the top of the core is located to the other end, so that a cone part (211) is formed;

the inner support expansion sleeve (3) is provided with an expansion disc part (31), an expansion sleeve part (32) integrally connected to the top center of the expansion disc part (31), and a tapered hole (33) penetrating through the expansion disc part (31) and the expansion sleeve part (32), the size of the tapered hole (33) is matched with that of the cone part (211), and the cone part (211) is inserted into and attached to the tapered hole (33); the sleeve expanding part (32) is divided into a plurality of expanding claw parts (321) which are distributed in an annular equal interval, and the plurality of expanding claw parts (321) can be elastically deformed;

the driving device is in transmission connection with the disc expanding portion (31), and can pull the inner support expanding sleeve (3) to move downwards relative to the inner support core (2), so that the plurality of claw expanding portions (321) synchronously expand outwards under the pushing resistance of the vertebral body portion (211).

2. The automatic internal stay tensioning device capable of ensuring concentricity according to claim 1, wherein: the inner support core (2) is also provided with a mounting seat (22), and the core (21) is formed by extending the top of the mounting seat (22) upwards along the axis; the inner support core (2) is fixed in a mounting hole (11) formed in the top of the base (1) through the mounting seat (22), the expansion disc portion (31) is located above the mounting seat (22), and a gap for the movement of the inner support expansion sleeve (3) is reserved between the inner support core and the mounting seat.

3. The automatic internal stay expanding device capable of guaranteeing concentricity according to claim 2, wherein: the bottom of base (1) be provided with shoulder hole (12) of mounting hole (11) intercommunication, and install gliding piston spare (4) from top to bottom in shoulder hole (12), piston spare (4) through a plurality of fixing bolt (5) with dish portion (31) fixed connection expands, drive arrangement passes through piston spare (4) drive interior expanding sleeve (3) up-and-down reciprocating motion.

4. The automatic internal stay tensioning device capable of ensuring concentricity according to claim 3, wherein: the mounting seat (22) is vertically provided with a plurality of through holes (221) for the fixing bolts (5) to penetrate one by one, and each through hole (221) is internally provided with a guide sleeve (6) sleeved on the corresponding fixing bolt (5).

5. The automatic internal stay expanding device capable of guaranteeing concentricity according to claim 3, wherein: the fixing bolts (5) adopt equal-height screws which are distributed on the expansion disc part (31) in an annular shape at equal intervals.

6. The automatic internal stay tensioning device capable of ensuring concentricity according to claim 1, wherein: inner support expands and is provided with a plurality of first dividing groove (34) and a plurality of second dividing groove (35) along radial equidistant on cover (3), and is a plurality of first dividing groove (34) all certainly expand the top downwardly extending of cover portion (32) expand the middle part of dish portion (31), and is a plurality of second dividing groove (35) all certainly expand the bottom of dish portion (31) upwards extend to be close to expand the top department of cover portion (32), and a plurality of first dividing groove (34) and a plurality of second dividing groove (35) are in be interval staggered distribution on the circumference of inner support expansion cover (3).

7. The automatic internal stay tensioning device capable of ensuring concentricity according to claim 1, wherein: the upper cover (7) is fixed at the top of the base (1) and covers the inner support core (2) and part of the inner support expansion sleeve (3); the upper cover (7) is provided with a limiting hole (71), and the expansion sleeve part (32) and the vertebral body part (211) penetrate through the limiting hole (71) and extend upwards.

8. The automatic internal stay expanding device capable of guaranteeing concentricity according to claim 7, wherein: and a positioning boss (72) is arranged at the top end of the upper cover (7) around the outer side of the limiting hole (71).

9. The automatic internal stay tensioning device capable of ensuring concentricity according to claim 1, wherein: the lower end of the core (21) is provided with a cylindrical part (212), the cone part (211) is integrally connected to the top end of the cylindrical part (212), and the diameter of the lower end of the cone part (211) is consistent with that of the cylindrical part (212).

10. The automatic internal stay expanding device capable of guaranteeing concentricity according to claim 1, wherein: the upper end surface of the vertebral body part (211) is not lower than the upper end surface of the expansion sleeve part (32).

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