CN112427666A

CN112427666A - Expansion mandrel device

Info

Publication number: CN112427666A
Application number: CN202011164599.4A
Authority: CN
Inventors: 唐恭平
Original assignee: HUBEI PETROKH MACHINE MANUFACTURING CO LTD
Current assignee: HUBEI PETROKH MACHINE MANUFACTURING CO LTD
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-03-02
Anticipated expiration: 2040-10-27
Also published as: CN112427666B

Abstract

The invention provides an expansion mandrel device which comprises a clamping main body, an elastic sleeve, a locking block and a locking fixing component, wherein the elastic sleeve is arranged between the clamping main body and the locking block, two axial ends of the elastic sleeve are respectively provided with an inner conical surface, the small ends of the inner conical surfaces at the two ends are communicated, the clamping main body and the locking block are respectively provided with an outer conical surface with the same taper as the inner conical surface of the elastic sleeve, and the locking block moves towards the clamping main body through the locking fixing component. The expansion mandrel device provided by the invention has the advantages of double-side conical surface expansion, uniform expansion sleeve deformation, smooth expansion sleeve deformation process, long expansion sleeve service life, automatic alignment, high centering precision and automatic reset and separation.

Description

Expansion mandrel device

Technical Field

The invention relates to the technical field of machining, in particular to an expansion mandrel device.

Background

The expansion mandrel is generally divided into two types, namely a mechanical type and a hydraulic type, wherein the mechanical type is a three-tile type, the tile type such as a sliding sleeve type is pushed by a tile on a component such as a nut, the tile is enabled to move inwards and outwards along the radial direction of the mandrel to change the diameter so as to realize expansion and contraction, the expansion mandrel is particularly generally composed of an inner conical surface and an outer conical surface at one end, a plurality of open grooves are uniformly distributed on the circumference of an expansion sleeve, the expansion sleeve deforms when a locking outer cone presses an inner cone, and the diameter of the expansion sleeve is increased so as to. However, the mechanical expansion mandrel of the prior art exists in the following points: 1. usually, a conical surface is arranged on one side, when the expansion sleeve is used, the deformation generated at one end of the conical surface is relatively large, the deformation amount is the condition that the deformation amount is gradually reduced from the end part of the opening which is contacted firstly to the other end, the expansion sleeve has uneven expansion deformation, and the contact force with the tightened part is uneven; 2. the groove processed on the common expansion sleeve is also unidirectional, one end without the groove basically cannot deform, and the expansion sleeve is not uniformly expanded; 3. the ejection device is not arranged, and when the locking bolt is loosened, the expansion sleeve cannot be normally contracted, loosened, reset and separated; 4. the centering mechanism is not provided with a guide hole or an alignment structure, and is completely centered by the inner conical surface and the outer conical surface, so that the centering precision is not high.

Therefore, the expansion mandrel device which is capable of expanding the conical surfaces on the two sides, enabling the expansion sleeve to deform uniformly, enabling the expansion sleeve to deform smoothly, enabling the expansion sleeve to have long service life, being capable of aligning automatically, being high in centering precision and being capable of resetting and separating automatically needs to be designed.

Disclosure of Invention

The invention aims to provide an expansion mandrel device which has the advantages of double-side conical surface expansion, uniform expansion sleeve deformation, smooth expansion sleeve deformation process, long expansion sleeve service life, automatic alignment, high centering precision and automatic reset and separation.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides an inflation dabber device, includes centre gripping main part, elastic sleeve, latch segment, locking fixed subassembly, the elastic sleeve sets up between centre gripping main part and latch segment, the axial both ends of elastic sleeve all are provided with interior conical surface, and the interior conical surface tip at both ends communicates the setting, centre gripping main part and latch segment all are provided with the outer conical surface the same with the interior conical surface tapering of elastic sleeve, the latch segment is close to the removal to the centre gripping main part through locking fixed subassembly.

Through adopting above-mentioned technical scheme, inflation dabber device's elastic sleeve both ends all are provided with interior conical surface, and the interior conical surface tip at both ends communicates, and when making the latch segment do close motion to the centre gripping main part along the guiding hole through locking fixed subassembly, the outer conical surface of latch segment and centre gripping main part can drive the elastic sleeve simultaneously and produce deformation, improves the homogeneity of elastic sleeve deformation to the positive and negative commonality of installation can be improved to the interior conical surface homoenergetic in both sides.

As a further arrangement of the invention, the locking fixing component comprises a locking bolt, one end of the locking bolt is provided with a blocking piece, a through hole is arranged on the central line of the locking block, the locking bolt penetrates through the through hole and extends to the clamping main body, the central line of the clamping main body is provided with a threaded hole, an internal thread matched with an external thread of the locking bolt is arranged in the threaded hole, and the external diameter of the blocking piece is larger than the internal diameter of the through hole.

Through adopting above-mentioned technical scheme, locking fixed subassembly is the locking bolt, makes the latch segment do close motion to the centre gripping main part along the guiding hole in through screwing up the locking bolt, simple structure, and the practicality is strong.

As a further arrangement of the invention, a spring is provided within the elastic sleeve, said spring being disposed between the clamping body and the locking block.

Through adopting above-mentioned technical scheme, when the latch segment was loosened to needs, during the unscrew bolt, the spring can act on latch segment and centre gripping main part simultaneously, realizes that latch segment and centre gripping main part break away from the elastic sleeve fast, realizes the separation of automatic re-setting.

The spring is a gradual change spring, the spiral line of the gradual change spring is an Archimedes spiral line, the taper of the gradual change spring is matched with the taper of the inner conical surface of the elastic sleeve, the minimum inner diameter of the gradual change spring is larger than or equal to the minimum inner diameter of the elastic sleeve, and the maximum inner diameter of the gradual change spring is smaller than the maximum inner diameter of the elastic sleeve.

By adopting the technical scheme, the spring is a gradual change spring which is made of hard materials, the spiral line of the spring is an Archimedes spiral line, so that the inner diameter of the spring is gradually increased from small to large, the taper of the gradual change spring is matched with the taper of the inner conical surface of the elastic sleeve, the minimum inner diameter of the gradual change spring is more than or equal to the minimum inner diameter of the elastic sleeve, the maximum inner diameter of the gradual change spring is less than the maximum inner diameter of the elastic sleeve, the gradual change spring is compressed when the locking block is close to the clamping main body, each circle of spiral line moves inwards, the outer conical surface similar to the locking block supports the small end of the inner conical surface of the elastic sleeve to a certain degree, all positions of the axial direction of the elastic sleeve are supported by force, the expansion sleeve is expanded and deformed uniformly, the contact force with a tightened part is uniform, the combination firmness of the elastic sleeve and the part is improved, and the spring is gradually compressed, adjacent single coil spring realizes the coincidence on the coplanar, the spring "becomes real" gradually in elastic sleeve radial direction, consequently, the expanding force of gradual change spring at the in-process of compressed grow gradually, can satisfy in the elastic sleeve conical surface be close to the tip inner wall more thickly more, the bigger operating mode of expanding force of needs, realize the homogeneity of whole compression process elastic sleeve deformation, can prop the interior taper hole of big spring position to a certain extent in advance before locking block or centre gripping main part prop big interior taper hole, it is mild to realize the cover deformation process that rises, the extension cover long service life rises, but direct outer conical surface props big interior taper hole, cause the interior taper hole violence to prop badly easily, shorten the life of cover that rises.

As a further arrangement of the invention, two gradual change springs are arranged, the small ends of the two gradual change springs are opposite, and the large ends of the two gradual change springs are arranged back to back.

Through adopting above-mentioned technical scheme, when needs loosen the latch segment, unscrew the bolt, two gradual change springs can act on latch segment and centre gripping main part simultaneously, realize that latch segment and centre gripping main part break away from the elastic sleeve fast, realize the separation of automatic re-setting.

As a further arrangement of the invention, the long-shaped groove is provided with a section of release groove along the axial direction, the width of the release groove is larger than that of the long-shaped groove, and the length of the release groove is the same as that of the spring in the free state in the axial direction.

Through adopting above-mentioned technical scheme, the width that the pine leaves the groove is greater than the width in elongated groove, and length is the same with the axial direction's that the spring is free state length, because the spring is hollow structure, the expanding force of spring in compression process is less than the outer conical surface of latch segment or centre gripping body, consequently the pine leaves the groove width and is greater than the elongated groove for the elastic resistance of elastic sleeve at the in-process that the spring propped open reduces, improves the effect of strutting of spring, realizes the homogeneity that the elastic sleeve propped open.

As a further arrangement of the invention, the locking block is provided with a conical guide post, and the clamping main body is provided with a matched conical guide hole.

Through adopting above-mentioned technical scheme, at the in-process that the grip block is close to the centre gripping main part, the micro-deviation of guide post can be corrected automatically to conical guiding hole, guides the guide post to the center line position, realizes the automatic alignment centering effect of device in-process.

As a further arrangement of the invention, the taper of the inner conical surface of the elastic sleeve is 10-30 degrees.

By adopting the technical scheme, the inner taper of the elastic sleeve is 10-30 degrees, the taper of the corresponding locking block and the taper of the outer conical surface of the clamping main body are also 10-30 degrees, and the angle is convenient for processing and has good tensioning effect.

As a further arrangement of the invention, a plurality of long grooves extending along the axial direction of the elastic sleeve are uniformly distributed on the outer wall of the elastic sleeve along the circumference, and the two ends of the long grooves are distributed at intervals in a staggered way.

Through adopting above-mentioned technical scheme, can improve the homogeneity that the elastic sleeve rises.

The beneficial effect of this scheme:

1. the two ends of the elastic sleeve of the expansion core shaft device are respectively provided with the inner conical surfaces, the small ends of the inner conical surfaces at the two ends are communicated, when the bolt is tightened to enable the locking block to move close to the clamping main body along the guide hole, the outer conical surfaces of the locking block and the clamping main body can simultaneously drive the elastic sleeve to deform, the deformation uniformity of the elastic sleeve is improved, and the inner conical surfaces at the two sides are the same, so that the positive and negative universality of installation can be improved.

2. The spring of the invention is a gradual change spring which is made of hard material, the spiral line of the spring is Archimedes spiral line, therefore, the spring is a gradual change spring whose inner diameter gradually increases from small to large, the taper of the gradual change spring is matched with the taper of the inner conical surface of the elastic sleeve, the minimum inner diameter of the gradual change spring is more than or equal to the minimum inner diameter of the elastic sleeve, the maximum inner diameter of the gradual change spring is less than the maximum inner diameter of the elastic sleeve, the gradual change spring is compressed when the locking block is close to the clamping main body, each circle of spiral line moves inwards, the outer conical surface similar to the locking block supports the small end of the inner conical surface of the elastic sleeve to a certain extent, the stress support of all positions of the axial direction of the elastic sleeve is realized to be large, the expansion deformation of the expansion sleeve is uniform, the contact force with the tightened part is uniform, the binding firmness of the elastic sleeve and the part is improved, and the adjacent single circles of the spring, the spring is gradually 'become real' in elastic sleeve radial direction, therefore the gradual change spring inflation power grow gradually at the in-process of compressed, can satisfy the interior conical surface of elastic sleeve more close to the tip inner wall thicker, the bigger operating mode of required inflation power, realize the homogeneity of whole compression process elastic sleeve deformation.

3. The invention has the advantages that the long-shaped groove is provided with the release groove along the axial direction, the width of the release groove is larger than that of the long-shaped groove, the length of the release groove is the same as that of the spring in the free axial direction, and the expansion force of the spring in the compression process is smaller than that of the locking block or the outer conical surface of the clamping body, so that the width of the release groove is larger than that of the long-shaped groove, the elastic resistance of the elastic sleeve in the spring opening process is reduced, the opening effect of the spring is improved, and the opening uniformity of the elastic sleeve is realized.

4. The gradual change spring arranged in the invention can advance the inner taper hole at the position of the spring to a certain extent before the locking block or the clamping main body expands the inner taper hole, so that the expansion sleeve has a smooth deformation process, the service life of the expansion sleeve is prolonged, the expansion sleeve is not directly expanded by the outer taper surface, the inner taper hole is easily expanded by sudden force, and the service life of the expansion sleeve is shortened.

5. The two gradual-change springs are arranged, the small ends of the two gradual-change springs are opposite, the large ends of the two gradual-change springs are arranged back to back, when the locking block needs to be loosened, the bolt is loosened, the two gradual-change springs can simultaneously act on the locking block and the clamping main body, the locking block and the clamping main body can be quickly separated from the elastic sleeve, and automatic reset separation is realized.

6. A spring is arranged between the locking block and the clamping main body, when the bolt is screwed down, the spring is compressed to realize sleeve expansion operation, when the bolt needs to be loosened, the bolt is unscrewed, and the locking block is driven away from the clamping main body by the elasticity of the spring to realize the automatic resetting and separating function.

7. The clamping block is provided with the conical guide post, the clamping main body is provided with the matched conical guide hole, and the conical guide hole can automatically correct the micro deviation of the guide post and guide the guide post to the central line position in the process that the clamping block approaches to the clamping main body, so that the automatic alignment and centering effects in the device process are realized.

Drawings

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

FIG. 1 is a schematic view of an exploded construction of an expansion mandrel assembly of the present invention;

FIG. 2 is a schematic cross-sectional view of an expansion mandrel assembly of the present invention;

fig. 3 is a schematic view of a structure for gradually changing the compression state of a spring.

In the figure, the clamping device comprises a clamping main body 1, an elastic sleeve 2, a locking block 3, a locking fixing component 4, an inner conical surface 5, an outer conical surface 6, a locking bolt 7, a blocking piece 8, a blocking piece 9, a through hole 10, a threaded hole 11, a spring 12, a gradual change spring 13, a guide post 14, a guide hole 15, an elongated groove 16 and a release groove.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Referring to fig. 1-3, the invention provides an expansion mandrel device, which comprises a clamping main body 1, an elastic sleeve 2, a locking block 3 and a locking fixing component 4, wherein the elastic sleeve 2 is arranged between the clamping main body 1 and the locking block 3, two axial ends of the elastic sleeve 2 are respectively provided with an inner conical surface 5, the taper of the inner conical surface 5 of the elastic sleeve 2 is 10-30 degrees, the taper is 10 degrees, the small ends of the inner conical surfaces 5 at the two ends are communicated, the clamping main body 1 and the locking block 3 are respectively provided with an outer conical surface 6 with the same taper as the inner conical surface 5 of the elastic sleeve 2, a plurality of long grooves 15 extending along the axial direction of the elastic sleeve 2 are uniformly distributed on the outer wall of the elastic sleeve 2 along the circumference, the long grooves 15 are distributed at intervals at two ends in a staggered manner, the locking block 3 moves towards the clamping main body 1 through the locking fixing component 4, and the locking fixing component 4 comprises a locking, Locking bolt 7 one end is provided with separation blade 8, be provided with through-hole 9 on the central line of latch segment 3, locking bolt 7 runs through-hole 9 and stretches to centre gripping main part 1, centre gripping main part 1 central line sets up screw hole 10, be provided with in the screw hole 10 with locking bolt 7's external screw thread assorted internal thread, the external diameter of separation blade 8 is greater than the through-hole 9 internal diameter.

Specifically, be provided with spring 11 in the elastic sleeve 2, spring 11 sets up between centre gripping main part 1 and latch segment 3, and spring 11 is gradual change spring 12, the helix of gradual change spring 12 is Archimedes spiral, and the tapering of gradual change spring 12 and the tapering phase-match of the interior conical surface 5 of elastic sleeve 2, the minimum internal diameter more than or equal to of gradual change spring 12 the minimum internal diameter of elastic sleeve 2, the biggest internal diameter of gradual change spring 12 are less than the biggest internal diameter of elastic sleeve 2, and gradual change spring 12 sets up to two, two gradual change spring 12 tip relative, the main aspects set up to the back.

Specifically, the long groove 15 is provided with a section of release groove 16 along the axial direction, the width of the release groove 16 is larger than that of the long groove 15, and the length of the release groove 16 is the same as that of the spring 11 in the free state in the axial direction.

Specifically, the locking block 3 is provided with a conical guide post 13, and the clamping body 1 is provided with a matched conical guide hole 14.

The working principle is as follows: the two ends of the elastic sleeve 2 of the expansion mandrel device are provided with the inner conical surfaces 5, the small ends of the inner conical surfaces 5 at the two ends are communicated, when the bolts are screwed down to enable the locking block 3 to move close to the clamping main body 1 along the guide hole 14, the locking block 3 and the outer conical surface 6 of the clamping main body 1 can simultaneously drive the elastic sleeve 2 to deform, the deformation uniformity of the elastic sleeve 2 is improved, and the inner conical surfaces 5 at the two sides can improve the positive and negative universality of installation; and the spring 11 is a gradual change spring 12 which is made of hard material 11, the spiral line of the spring 11 is Archimedes spiral line, therefore, the spring 11 is a gradual change spring 12 whose inner diameter gradually increases from small to large, the taper of the gradual change spring 12 is matched with the taper of the inner conical surface 5 of the elastic sleeve 2, the minimum inner diameter of the gradual change spring 12 is larger than or equal to the minimum inner diameter of the elastic sleeve 2, the maximum inner diameter of the gradual change spring 12 is smaller than the maximum inner diameter of the elastic sleeve 2, the gradual change spring 12 is compressed when the locking block 3 is close to the clamping main body 1, each circle of spiral line moves inwards, the outer conical surface 6 similar to the locking block 3 supports the small end of the inner conical surface 5 of the elastic sleeve 2 to a certain extent, the stress support of all positions of the elastic sleeve 2 in the axial direction is realized, the expansion deformation of the expansion sleeve is uniform, the contact force with the tightened part is uniform, the combination firmness of, and gradual change spring 12 is in the in-process that is compressed tightly gradually, and adjacent single coil spring 11 realizes the coincidence on the coplanar, and spring 11 "becomes real" gradually in the radial direction of elastic sleeve 2, and consequently gradual the grow of the expanding force of gradual change spring 12 in the in-process of compressed can satisfy that 2 inner cone surfaces 5 of elastic sleeve are close to the tip inner wall more thickly more, and the working condition that the expanding force that needs is bigger more realizes the homogeneity of whole compression process elastic sleeve 2 deformation.

The expansion mandrel device provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An expansion mandrel device, characterized in that: including centre gripping main part (1), elastic sleeve (2), latch segment (3), locking fixed subassembly (4), elastic sleeve (2) set up between centre gripping main part (1) and latch segment (3), elastic sleeve (2) axial both ends all are provided with interior conical surface (5), and interior conical surface (5) tip at both ends communicate the setting, centre gripping main part (1) and latch segment (3) all are provided with the outer conical surface (6) the same with interior conical surface (5) tapering of elastic sleeve (2), latch segment (3) are close to the removal to centre gripping main part (1) through locking fixed subassembly (4).

2. The expansion mandrel device as claimed in claim 1, wherein the locking fixing assembly (4) comprises a locking bolt (7), a blocking piece (8) is arranged at one end of the locking bolt (7), a through hole (9) is formed in the center line of the locking block (3), the locking bolt (7) penetrates through the through hole (9) and extends to the clamping main body (1), a threaded hole (10) is formed in the center line of the clamping main body (1), an internal thread matched with the external thread of the locking bolt (7) is formed in the threaded hole (10), and the outer diameter of the blocking piece (8) is larger than the inner diameter of the through hole (9).

3. An expansion mandrel device according to claim 1 characterised in that a spring (11) is arranged in the elastic sleeve (2), said spring (11) being arranged between the clamping body (1) and the locking piece (3).

4. An expansion mandrel device according to claim 3 characterised in that said spring (11) is a progressive spring (12), the helix of said progressive spring (12) being an Archimedes spiral, the taper of the progressive spring (12) matching the taper of the internal conical surface (5) of the elastic sleeve (2), the minimum internal diameter of the progressive spring (12) being greater than or equal to the minimum internal diameter of said elastic sleeve (2), the maximum internal diameter of the progressive spring (12) being less than the maximum internal diameter of the elastic sleeve (2).

5. An expansion mandrel device according to claim 4 characterised in that said graduated springs (12) are provided in two, with the small ends of said graduated springs (12) being opposite and the large ends being set back.

6. Expansion mandrel device according to claim 1, characterised in that the locking piece (3) is provided with a conical guide post (13) and the clamping body (1) is provided with a matching conical guide hole (14).

7. An expansion mandrel device according to claim 1 characterised in that the inner conical surface (5) of the elastic sleeve (2) is tapered at 10 ° to 30 °.

8. An expansion mandrel device according to claim 1, characterized in that the outer wall of the elastic sleeve (2) is uniformly provided with a plurality of long grooves (15) extending along the axial direction of the elastic sleeve (2) along the circumference, and the long grooves (15) are distributed at intervals with two ends staggered.

9. An expansion mandrel device according to claim 8 characterised in that the elongated slot (15) is provided with a release groove (16) in the axial direction, the width of the release groove (16) being greater than the width of the elongated slot (15) and the length being the same as the length of the spring (11) in the axial direction in its free state.