CN114346937B - Clamping mechanism and clamping method - Google Patents
Clamping mechanism and clamping method Download PDFInfo
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- CN114346937B CN114346937B CN202210077548.0A CN202210077548A CN114346937B CN 114346937 B CN114346937 B CN 114346937B CN 202210077548 A CN202210077548 A CN 202210077548A CN 114346937 B CN114346937 B CN 114346937B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 35
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- 230000006835 compression Effects 0.000 claims abstract description 75
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- 239000002184 metal Substances 0.000 claims abstract description 60
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
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- 238000003825 pressing Methods 0.000 claims description 32
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- 230000013011 mating Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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Abstract
The utility model relates to a clamping mechanism and a clamping method. The device solves the defects of large volume, unreasonable internal expansion design and the like in the prior art. The clamping mechanism comprises a positioning jig; the radial inner tensioning elastic piece is cylindrical and fixed on the positioning jig; the inner expansion driving cylinder penetrates through the radial inner expansion elastic piece, a wedge-shaped transmission structure is arranged between the inner expansion driving cylinder and the radial inner expansion elastic piece, and the inner expansion driving cylinder moves axially towards the expansion direction relative to the radial inner expansion elastic piece and forces the radial inner expansion elastic piece to expand outwards under the action of the wedge-shaped transmission structure; the axial compression piece is matched with the positioning jig so as to compress the metal frame; the compression driving rod penetrates through the inner expansion driving cylinder, and drives the axial compression piece to axially move in the radial inner expansion elastic piece. The utility model has the advantages that: saving space and ensuring the internal expansion is in place.
Description
Technical Field
The utility model belongs to the technical field of 3C product processing jigs, and particularly relates to a clamping mechanism and a clamping method.
Background
With the continuous development of mobile terminal technology, the application of electronic devices such as smart phones, palm computers, smart watches and the like is very popular, and becomes an important component in the work and life of people, the shell of the electronic device usually adopts a metal middle frame structure, and the metal middle frame structure has the advantages of wear resistance and easy heat dissipation, and meanwhile, the product can leave a high-end impression for users.
The metal middle frame has the characteristics of weak structure and high appearance requirement, and the traditional processing mode of the metal middle frame generally comprises the following three methods: 1. appearance is prior, and finally blanking is carried out; the technical disadvantage is that the product is easy to deform, and the inner length and the width are not proportional; 2. the inner cavity is preferential, a product is clamped in a hamburger-like manner, and the appearance is processed; the technical disadvantage is that the processing time is longer and the cost is relatively larger; 3. the inner cavity is preferential, and the inner supporting mechanism supports the side wall of the inner cavity of the product to process the appearance; the technological disadvantage is that a, the sizes of the supporting surfaces of the inner cavities of the products are different, so that the products cannot be effectively matched; b. the product has a weak structure and is at risk of overstretching or understretching, thereby causing deformation or twisting of the product and difficult maintenance. For example, the inventor designs a mechanical tensioning device, application number CN200920218039.5, and a mechanical tensioning device, where the mechanical tensioning device includes a slider, the slider is in threaded connection with a hanging ring, a hook at one end of a tension spring hooks the hanging ring, another hanging ring is hooked at the other end of the tension spring, the other hanging ring is in threaded connection with a connecting piece, the connecting piece is in threaded connection with a guide disc by using a countersunk screw, the guide disc is welded with a hollow shaft, the hollow shaft is connected with a screw by using a bearing, the screw is in threaded or trapezoidal threaded connection with a rack, and the rack is connected with a wedge ring by using a countersunk screw. The utility model has the advantages that the rack and the wedge ring connected to the rack are driven by the screw to move along the axial direction of the screw, and the wedge ring jacks up a plurality of sliding blocks uniformly distributed in the circumferential direction, so that the sliding blocks slide out radially along the T-shaped groove in the guide disc, the end head of the sliding block is tightly supported on the inner wall of the welding joint of the cylinder to be welded, and the welding joint part of the cylinder is supported.
The above scheme can realize radial inner tensioning, but the inner tensioning is in sliding fit and needs to be turned forward and backward to realize inner tensioning and cancel the inner tensioning, the structure is complex, the operation is complex, and the driving mode is difficult to be used for inner tensioning of a metal middle frame of a 3C product, because the driving mode cannot be accurately supported in place or excessively supported outwards.
Secondly, the existing radial inner tensioning and axial locking split design causes that the whole structure occupies a larger space, and the axial lead of the axial locking piece and the axial lead of the inner tensioning piece are not coincident after radial inner tensioning, so that the machining precision of the metal middle frame is poor, the rejection rate is high, and the final assembly precision is influenced.
Disclosure of Invention
The present utility model aims to solve the above problems, and provides a clamping mechanism and a clamping method capable of solving the above technical problems.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the clamping mechanism comprises a positioning jig;
the radial inner tensioning elastic piece is cylindrical and fixed on the positioning jig;
the inner expansion driving cylinder penetrates through the radial inner expansion elastic piece, a wedge-shaped transmission structure is arranged between the inner expansion driving cylinder and the radial inner expansion elastic piece, and the inner expansion driving cylinder moves axially towards the expansion direction relative to the radial inner expansion elastic piece and forces the radial inner expansion elastic piece to expand outwards under the action of the wedge-shaped transmission structure;
the axial compression piece is matched with the positioning jig so as to compress the metal frame;
the compression driving rod penetrates through the inner expansion driving cylinder and drives the axial compression piece to axially move in the radial inner expansion elastic piece; the compressing driving rod drives the axial compressing piece to be close to the metal frame arranged on the positioning jig, and the axial compressing piece compresses the metal frame on the positioning jig.
In the above clamping mechanism, the radially inner tensioning elastic member comprises a cylindrical portion, one end of the cylindrical portion is fixed to the positioning jig, the other end of the cylindrical portion extends out of the positioning jig, a plurality of decompression grooves are formed in the circumferential direction of the other end of the cylindrical portion, elastic portions are formed between two adjacent decompression grooves, each elastic portion is respectively and vertically connected with an inner tensioning block, the elastic portion is located in a through hole I of the positioning jig, and a gap is reserved between the elastic portion and the through hole I.
In the above clamping mechanism, the wedge-shaped transmission structure comprises an inner wedge surface arranged on the inner wall of the elastic part, an outer wedge surface in contact with the inner wedge surface is arranged on the outer wall of the inner expansion driving cylinder, and when the inner expansion driving cylinder moves to the side of the positioning jig, the outer wedge surface presses the inner wedge surface so as to force the inner expansion block connected to the elastic part to displace radially outwards.
In the clamping mechanism, the inner expansion blocks and the positioning surfaces of the positioning jig are distributed at intervals. Or both are in sliding contact.
In the clamping mechanism, the axial compression piece is located on one surface of the inner expansion block, which is far away from the locating surface of the locating jig, and the axial compression piece and the other surface of the inner expansion block are distributed at intervals.
In the clamping mechanism, a through hole III is formed in the axial center of the axial compression member, the upper end of the compression driving rod penetrates through the through hole III, the upper end of the compression driving rod is connected with the detachable member in a threaded mode, and the cap end of the detachable member is pressed on the upper orifice of the through hole III.
In the clamping mechanism, the through hole III comprises a central hole and a lateral communication avoidance groove laterally communicated with the central hole, and the inner diameter of the communication part of the lateral communication avoidance groove and the central hole is larger than the aperture of the central hole.
In the clamping mechanism, the axial pressing piece comprises an outer pressing frame, an embedded pressing block with the through hole III is arranged in the outer pressing frame, and the outer circumferential surface of the embedded pressing block is tightly attached to the inner wall surface of the outer pressing frame.
In the clamping mechanism, a guide structure for guiding the axial compression piece to radially inwards tighten the axial movement of the elastic piece is arranged between the axial compression piece and the positioning jig.
In the clamping mechanism, one end of the inner expansion driving cylinder, which is close to the positioning jig, extends out of the positioning jig, and one end of the inner expansion driving cylinder, which extends out of the positioning jig, is connected with an inner expansion driving device for driving the inner expansion driving cylinder to move upwards in the axial direction of the radial inner expansion elastic piece.
In the clamping mechanism, the internal expansion driving device comprises a moving frame connected with one end of the internal expansion driving cylinder extending out of the positioning jig, and an internal expansion driver connected with the moving frame is fixed on the positioning jig and drives the internal expansion driving cylinder connected with the moving frame to axially move.
In the clamping mechanism, one end of the pressing driving rod, which is close to the positioning jig, extends out of the positioning jig, and a pressing driver connected with one end of the pressing driving rod, which extends out of the positioning jig, is fixed on the positioning jig.
The clamping method adopts the clamping mechanism, and comprises the following steps:
s1, placing, namely placing the metal frame on a positioning surface of a positioning jig;
s2, radial tensioning, wherein the inner tensioning driving cylinder moves in a set tensioning direction, so that the elastic part of the radial inner tensioning elastic piece is forced to deform radially outwards and drive the inner tensioning block to displace radially outwards, and finally the inner tensioning block is in contact with the inner wall of the metal frame for tensioning;
s3, axially locking, namely, pressing the driving rod to move towards the axial locking direction, forcing the axial pressing piece to be close to the metal frame in the step S2, and pressing the other axial end of the metal frame far away from the positioning jig.
Compared with the prior art, the clamping mechanism has the advantages that:
1. compact structure and small, radial inside tension elastic component, the synergism of inside tension actuating cylinder and axial compress tightly the piece, tension and axial centre gripping two kinds of structures are in the same place, can exert the driving force in a direction, when realizing the centre gripping, do not occupy external space to the convenience carries out the processing operation to the product outside.
2. The axial compression of the metal middle frame after the metal middle frame is internally tensioned can be ensured to be perpendicular to the axial direction of the metal middle frame, so that the metal middle frame is ensured to be accurately compressed, and the compression deviation of the metal middle frame caused by the deviation between the axial lead of the radial internal tensioning and the axial lead of the compression is prevented.
3. By means of the design of the radial inner tensioning elastic piece, inner tensioning can be guaranteed to be in place, the phenomenon that the inner tensioning is not in place or excessive outer and inner tensioning is avoided, and the radial original size precision of the metal middle frame can be guaranteed.
4. The radial inner tension elastic piece is utilized, so that the inner tension can be automatically canceled, and the production and processing efficiency is improved.
Drawings
Fig. 1 is a schematic perspective view of a clamping mechanism provided by the utility model.
Fig. 2 is a schematic structural diagram of a clamping mechanism provided by the utility model.
Fig. 3 is a schematic view of a longitudinal section of a clamping mechanism provided by the utility model.
Fig. 4 is a schematic view of a transverse cross-sectional structure of a clamping mechanism provided by the utility model.
Fig. 5 is an exploded view of a part of the structure of the clamping mechanism according to the present utility model.
Fig. 6 is a schematic view of a metal middle frame structure provided by the utility model.
Fig. 7 is an enlarged schematic view of the structure at a in fig. 3.
In the drawing, a positioning jig 1, a positioning pin 10, a bracket 11, a connecting bolt 12, a first through hole 13, a counterbore 130, a guide post 14, a radially inner tension elastic member 2, a cylindrical portion 20, an elastic portion 21, an inner tension block 22, an inner wedge surface 23, an outer flat surface 24, an upper end axial limiting convex portion 25, a lower axial limiting block 26, a transverse bolt 27, a decompression hole 28, an inner tension driving cylinder 3, an outer wedge surface 30, an axial tension member 4, a guide sleeve 40, an outer tension frame 41, an embedded compression block 42, a third through hole 43, a tension driving rod 5, a detachable member 50, an inner tension driving device 6, a moving frame 60, an inner tension driving member 61, a tension driving member 7 and a metal middle frame a.
Detailed Description
The following are specific embodiments of the utility model and the technical solutions of the utility model will be further described with reference to the accompanying drawings, but the utility model is not limited to these embodiments.
Example 1
As shown in fig. 1-3 and 6, the clamping mechanism comprises a positioning jig 1, a radial inner tensioning elastic piece 2, an inner tensioning driving cylinder 3, an axial compression piece 4 and a compression driving rod 5, wherein a positioning surface is arranged on the top surface of the positioning jig 1 in the vertical direction for positioning a metal middle frame a, namely, the metal middle frame a is sleeved on the top of the positioning jig 1 and is attached to the positioning surface, as shown in fig. 5, and a plurality of positioning pins 10 are arranged on the positioning surface to be matched with a plurality of mounting holes a1 on the inner wall of the metal middle frame a, so that the purpose of positioning the metal middle frame a is achieved.
Next, in order to facilitate the installation of the jig, as shown in fig. 1 to 3, the positioning jig 1 of the present embodiment is fixed on the inverted U-shaped bracket 11, so that the inside of the bracket 11 is convenient for installing various driving sources. The positioning jig 1 can fix the positioning jig 1 on the bracket 11 through a plurality of connecting bolts 12.
As shown in fig. 7, a first through hole 13 is formed in the center of the positioning jig 1, a second through hole communicated with the first through hole is formed in the bracket 11, so that subsequent inward expansion and compression installation are facilitated, and meanwhile, the first through hole 13 can be designed to achieve the limit limiting purpose of excessive outward inward expansion.
As shown in fig. 2 and 7, the radially inward tension elastic member 2 is cylindrical and fixed to the positioning jig 1. The specific fixing structure is as follows: the lower extreme of radially inwards rising elastic element 2 is fixed in through-hole one through axial fixation structure, radially inwards rising elastic element 2 and through-hole a week are fixed and axial fixation, specifically is equipped with at least one interior plane at the inner wall of through-hole one, is equipped with in radially inwards rising elastic element 2 the one end outer wall of fixing in through-hole one with the outer plane 24 of interior plane coincidence, and interior plane and the coincide of outer plane realize circumference fixedly, and simultaneously, axial fixation structure includes: the fixed side of the outer plane and the radial inner tension elastic piece 2 form an upper end axial limiting convex part 25, the upper end axial limiting convex part 25 is clamped at the upper orifice of the through hole I to achieve the fixation of one axial end, the lower end of the radial inner tension elastic piece 2 extends out to the lower orifice of the through hole I, the lower end of the radial inner tension elastic piece 2 is sleeved with a lower axial limiting block 26, the lower axial limiting block 26 is propped against the lower orifice of the through hole I to achieve the axial fixation of the other end, and the structure can prevent the axial movement of the radial inner tension elastic piece 2 and achieve the purpose of circumferential fixation to prevent the free circumferential rotation of the radial inner tension elastic piece 2.
In order to form avoidance, an avoidance groove 15 is arranged on the top surface of the bracket 11 for the placement of the lower axial limiting block 26.
Further, a lower annular groove is arranged on the outer wall of the lower end of the radially inner tensioning elastic element 2, a lower axial limiting block 26 is annular and sleeved at the lower end of the radially inner tensioning elastic element 2, an inner convex ring extending into the lower annular groove is arranged on the inner wall of the lower axial limiting block 26 so as to realize connection between the radially inner tensioning elastic element 2 and the lower axial limiting block 26, and the lower axial limiting block 26 is fixed directly through a plurality of transverse bolts 27, and of course, the transverse bolts 27 can be replaced by transverse pins.
And a reaming 130 is arranged at the upper end of the first through hole 13, and a deformation gap is reserved between the outer wall of the upper end of the radial inner tensioning elastic piece 2 and the reaming so as to be beneficial to the deformation of the radial inner tensioning elastic piece 2.
The inner expansion driving cylinder 3 is arranged in the radial inner expansion elastic piece 2 in a penetrating way, and the axial lead of the inner expansion driving cylinder 3 is overlapped with the axial lead of the radial inner expansion elastic piece 2. And a wedge-shaped transmission structure is arranged between the inner expansion driving cylinder 3 and the radial inner expansion elastic piece 2, the inner expansion driving cylinder 3 moves axially towards the expansion direction relative to the radial inner expansion elastic piece 2, and the radial inner expansion elastic piece 2 is forced to expand outwards under the action of the wedge-shaped transmission structure.
In the above-defined vertical direction, the tensioning direction in this embodiment is downward movement.
The axial compression member 4 moves in the axial direction of the radially inner tension elastic member 2 relative to the radially inner tension elastic member 2. The axial compression member 4 is pressed against the axial upper end face of the metal center a to cooperate with the positioning face to compress the metal center axially. The axial compression member 4 cooperates with the positioning jig 1 to compress the metal frame a.
As shown in fig. 3-5 and 7, the compression driving rod 5 is inserted into the inner expansion driving cylinder 3, and the axial lead of the compression driving rod 5 is coincident with the axial lead of the inner expansion driving cylinder 3, so that the axial compression member 4 and the compression driving rod 5 are forced to move in the same direction when the compression driving rod 5 moves relative to the axial compression direction of the inner expansion driving cylinder 3, and the purpose of compression is achieved. That is, the pressing driving rod 5 drives the axial pressing member 4 to axially move in the radially inner tension elastic member 2; the compression driving rod 5 drives the axial compression member 4 to approach the metal frame a arranged on the positioning jig 1, and the axial compression member 4 compresses the metal frame a on the positioning jig 1.
The three axial lines adopted by the embodiment are overlapped, so that the axial compression of the metal middle frame to the metal middle frame after the metal middle frame is internally tensioned is perpendicular to the axial line of the metal middle frame, the metal middle frame is accurately compressed, and the situation that the internal tensioning support and the axial compression of the metal middle frame a cannot form a perpendicular state due to deviation between the radial internal tensioning axial line and the compressed axial line is prevented, and the processing quality of the final metal middle frame is influenced.
Specifically, the radial inner tension elastic member 2 of the present embodiment is an integral radial inner tension elastic member, the radial inner tension elastic member 2 includes a cylindrical portion 20, the cylindrical portion 20 is fixed in a through hole one of the positioning jig 1 by using the axial positioning structure, one end of the cylindrical portion 20 is fixed in the positioning jig 1, a plurality of decompression grooves 200 are formed in the circumferential direction of the other end of the cylindrical portion 20, an elastic portion 21 is formed between two adjacent decompression grooves, and each elastic portion 21 is respectively and vertically connected with an inner expansion block 22.
The elastic portion 21 is in the above-mentioned counterbore, and a gap is reserved between the outer wall of the elastic portion 21 and the inner wall of the counterbore. While the inner expansion block 22 is located in the upper bore of the counterbore and extends radially outwardly.
Next, a plurality of relief holes 28 are circumferentially distributed in a section of the cylindrical portion 20 in the counterbore, and each relief groove 200 communicates with one relief hole 28 to further enhance the elastic performance of the elastic portion 21.
The relief groove 200 has a groove width smaller than the aperture of the relief hole 28 to ensure final elastic properties.
The elastic part 21 can deform radially outwards to drive the radial displacement of the inner expansion block 22, and the deformation of elastic force is utilized to achieve the final inner expansion purpose, so that the inner expansion can be ensured to be in place, the phenomena of out-of-place inner expansion and excessive out-of-place inner expansion can be avoided, the condition that the final machining precision requirement cannot be met due to out-of-place inner expansion of the metal middle frame can be prevented, and meanwhile, the influence on the machining precision and the final assembly precision of the metal middle frame due to the radial deformation of the metal middle frame caused by excessive out-of-place inner expansion can be prevented.
Specifically, the wedge-shaped transmission structure of the present embodiment includes an inner wedge surface 23 provided on the inner wall of the elastic portion 21, and an outer wedge surface 30 in contact with the inner wedge surface 23 is provided on the outer wall of the inner expansion driving cylinder 3, and when the inner expansion driving cylinder 3 moves toward the positioning jig 1, the outer wedge surface 30 presses the inner wedge surface 23 to force the inner expansion block 22 connected to the elastic portion 21 to displace radially outwards.
The inner wedge surface 23 is an inner arcuate wedge surface and the outer wedge surface 30 is an outer wedge surface of a full turn. The outer wedge surface 30 presses the inner wedge surface 23 to deform the elastic portion 21 radially outwardly, and the inner expansion block 22 moves radially outwardly to achieve the radially inner expansion.
The elastic part 21 has self elasticity and deforms outwards under the drive of the wedge, and when the drive is lost, the elastic part automatically resets inwards, so that the scheme is simple and the use is flexible and convenient.
Preferably, the inner expansion blocks 22 are spaced from the positioning surface of the positioning jig 1. The axial compression piece 4 is positioned on one surface of the inner expansion block 22, which is far away from the positioning surface of the positioning jig 1, and the axial compression piece 4 and the other surface of the inner expansion block 22 are distributed at intervals.
The interval distribution can prevent the abrasion caused by mutual contact, and simultaneously can prevent the extrusion friction of the radial inward supporting position relative to the metal middle frame caused by the contact of the axial compression piece 4 and the inner expansion block 22, so as to damage the inner surface finish of the metal middle frame, ensure the perpendicularity of the final radial axis and the axial axis, ensure the accuracy of the fixed position of the metal middle frame and improve the subsequent processing quality.
In order to further ensure the verticality of the axial compression element 4 compressing the axial lead and the metal middle frame, a guide structure for guiding the axial compression element 4 to expand the elastic element 2 in the radial direction is arranged between the axial compression element 4 and the positioning jig 1. Specifically, the guiding structure comprises a plurality of guiding sleeves 40 fixed on the axial compression member 4, a plurality of guiding columns 14 which are inserted into the guiding sleeves 40 one by one are arranged on the positioning jig 1, avoiding groove bodies which avoid the guiding columns 14 are arranged on the inner expansion blocks 22, the axial lines of the guiding sleeves 40 and the guiding columns 14 are distributed along the axial line of the metal middle frame, and the mutual matching of the guiding sleeves 40 and the guiding columns 14 can enable the axial compression member 4 to move smoothly in the axial direction so as to ensure the final perpendicularity.
In order to realize the driving, as shown in fig. 1-3, one end of the inner expansion driving cylinder 3, which is close to the positioning jig 1, extends out of the positioning jig 1, and one end of the inner expansion driving cylinder 3, which extends out of the positioning jig 1, is connected with an inner expansion driving device 6 which drives the inner expansion driving cylinder 3 to axially move in the radial inner expansion elastic piece 2. The inner expansion driving device 6 drives the inner expansion driving cylinder 3 to axially move in the radial inner expansion elastic piece 2. Specifically, the internal expansion driving device 6 includes a moving frame 60 connected to one end of the internal expansion driving cylinder 3 extending out of the positioning jig 1, and an internal expansion driver 61 connected to the moving frame 60 is fixed to the positioning jig 1, and the internal expansion driver 61 drives the internal expansion driving cylinder 3 connected to the moving frame 60 to move axially.
Preferably, the moving frame 60 of the present embodiment is in an inverted U shape, and the internal expansion drivers 61 are cylinders or cylinders, two ends of the moving frame 60 of the present embodiment are respectively connected to an internal expansion driver 61, and the two internal expansion drivers 61 act synchronously to drive the vertical movement of the moving frame 60 under the combined action, so as to achieve the purpose of internal expansion.
The inner tension driver 61 is fixed to the bracket 11.
And one end of the compression driving rod 5, which is close to the positioning jig 1, extends out of the positioning jig 1, and a compression driver 7 connected with one end of the compression driving rod 5, which extends out of the positioning jig 1, is fixed on the positioning jig 1. The pressing driver 7 is a cylinder or an oil cylinder and is fixed to the bracket 11 described above. The fixing of the compressing driver 7 is performed by adopting a plurality of upright posts distributed in an array.
The clamping method of the embodiment comprises the following steps:
s1, placing, namely placing a metal frame a on a positioning surface of a positioning jig 1;
s2, radial tensioning, wherein the inner tensioning driving cylinder 3 moves in a set tensioning direction, so that the elastic part 21 of the radial inner tensioning elastic piece 2 is forced to deform radially outwards and drive the inner tensioning block 22 to displace radially outwards, and finally the inner tensioning block 22 contacts with the inner wall of the metal frame a for tensioning;
the above setting tension direction is exemplified in fig. 1, and the inner tension driving cylinder 3 moves downward.
S3, axially locking, wherein the compression driving rod 5 moves towards the axial locking direction, so that the axial compression piece 4 is forced to be close to the metal frame a in the step S2, and is pressed at the other axial end of the metal frame a, which is far away from the positioning jig 1.
The axial center of the axial compressing element 4 is provided with a through hole III 43, the upper end of the compressing driving rod 5 penetrates through the through hole III 43, the upper end of the compressing driving rod 5 is connected with a detachable element 50 in a threaded manner, and the cap end of the detachable element 50 is pressed on the upper orifice of the through hole III 43. The detachable member 50 is a T-shaped member such as a bolt or a screw.
The third through hole 43 comprises a central hole 430 and a lateral communicating avoidance groove 431 laterally communicated with the central hole, the inner diameter of the communicating part of the lateral communicating avoidance groove and the central hole 430 is larger than the aperture of the central hole, when the internal expansion is canceled, the upper end of the compression driving rod 5 is driven by the external acting force to leave from the central hole and enter the lateral communicating avoidance groove by the axial compression member 4, and at the moment, the axial compression member 4 can be disassembled to improve the disassembly and assembly clamping efficiency.
Example two
The structure and principle of this embodiment are basically the same as those of the first embodiment, and the different structures are as follows: as shown in fig. 5, the axial compression member 4 includes an outer compression frame 41, a plurality of avoidance notches are provided on the circumferential outer wall of the outer compression frame 41, and a compression mating surface mating with the upper end surface of the metal middle frame a is provided on the lower end surface of the outer compression frame 41, where the compression mating surface is used to mate with a designated mating surface of the upper end surface of the metal middle frame. Preferably, the compression fit surface of the embodiment is an upper conical surface, the upper end surface of the metal middle frame is a lower conical surface, the upper conical surface and the lower conical surface are matched to compress, and meanwhile, the shaft axis of the metal middle frame can be automatically corrected through the matching of the conical surfaces, so that the metal middle frame is compressed at a set central position.
Next, an embedded pressing block 42 (a third through hole 43 into which the pressing driving rod 5 is inserted is formed) is provided in the outer pressing frame 41, the outer circumferential surface of the embedded pressing block 42 is closely attached to the inner wall surface of the outer pressing frame 41, and the upper end surface of the embedded pressing block 42 is abutted against the cap end lower end surface in the first embodiment. An inner convex blocking shoulder is arranged on the lower side of the inner wall of the outer pressing frame 41, and the lower end surface of the embedded pressing block 42 abuts against the inner convex blocking shoulder so as to prevent the embedded pressing block 42 from being separated from the outer pressing frame 41 downwards.
By utilizing the split mode, the replacement of damaged and worn single components can be realized, so that the disassembly and replacement efficiency is improved, and meanwhile, the cost is reduced.
Example III
The structure and principle of this embodiment are basically the same as those of the first embodiment, and the different structures are as follows: the compressing driver 7 is a linear driving motor.
Example IV
The structure and principle of this embodiment are basically the same as those of the first embodiment, and the different structures are as follows: the internal expansion driving device 6 comprises a moving frame 60 connected with one end of the internal expansion driving cylinder 3 extending out of the positioning jig 1, and two linear driving motors connected with the moving frame 60 are fixed on the positioning jig 1 and synchronously act.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Claims (7)
1. Clamping mechanism, including positioning jig (1), its characterized in that, clamping mechanism still include:
the radial inner tensioning elastic piece (2) is cylindrical and is fixed on the positioning jig (1);
a first through hole (13) is arranged in the center of the positioning jig (1);
the inner expansion driving cylinder (3) is arranged in the radial inner expansion elastic piece (2) in a penetrating manner, a wedge-shaped transmission structure is arranged between the inner expansion driving cylinder (3) and the radial inner expansion elastic piece (2), and the inner expansion driving cylinder (3) moves axially towards the expansion direction relative to the radial inner expansion elastic piece (2) and forces the radial inner expansion elastic piece (2) to expand outwards under the action of the wedge-shaped transmission structure;
an axial compression piece (4) which is matched with the positioning jig (1) so as to axially compress the metal frame (a);
the compression driving rod (5) is arranged in the inner expansion driving cylinder (3) in a penetrating manner, and the compression driving rod (5) drives the axial compression part (4) to axially move in the radial inner expansion elastic part (2); the compression driving rod (5) drives the axial compression part (4) to be close to the metal frame (a) arranged on the positioning jig (1), and the axial compression part (4) compresses the metal frame (a) on the positioning jig (1);
the axial center of the axial compression piece (4) is provided with a through hole III (43), the upper end of the compression driving rod (5) penetrates through the through hole III (43), the upper end of the compression driving rod (5) is connected with a detachable piece (50), and the cap end of the detachable piece (50) is pressed on the upper orifice of the through hole III (43); the through hole III (43) comprises a central hole (430) and a lateral communication avoidance groove (431) which is laterally communicated with the central hole, and the inner diameter of the communication part of the lateral communication avoidance groove and the central hole (430) is larger than the aperture of the central hole; the axial pressing piece (4) comprises an outer pressing frame (41), an embedded pressing block (42) with a through hole III (43) is arranged in the outer pressing frame (41), and the outer circumferential surface of the embedded pressing block (42) is tightly attached to the inner wall surface of the outer pressing frame (41); a guide structure for guiding the axial compression piece (4) to axially move in the radial inner tensioning elastic piece (2) is arranged between the axial compression piece (4) and the positioning jig (1).
2. Clamping mechanism according to claim 1, wherein the radially inner tensioning elastic piece (2) comprises a cylinder part (20), one end of the cylinder part (20) is fixed on the positioning jig (1), a plurality of decompression grooves (200) are formed in the circumferential direction of the other end of the cylinder part (20), an elastic part (21) is formed between every two adjacent decompression grooves, each elastic part (21) is respectively connected with an inner tensioning block (22), the elastic part (21) is located in the through hole one (13) of the positioning jig (1), and a gap is reserved between the elastic part (21) and the through hole one (13).
3. Clamping mechanism according to claim 2, characterized in that the wedge transmission structure comprises an inner wedge surface (23) provided on the inner wall of the elastic part (21), an outer wedge surface (30) in contact with the inner wedge surface (23) being provided on the outer wall of the inner expansion driving cylinder (3), the outer wedge surface (30) pressing the inner wedge surface (23) when the inner expansion driving cylinder (3) moves towards the positioning jig (1) side, forcing the inner expansion blocks (22) connected to the elastic part (21) to displace radially outwards.
4. Clamping mechanism according to claim 1, characterized in that one end of the inner expansion driving cylinder (3) close to the positioning jig (1) extends out of the positioning jig (1), and one end of the inner expansion driving cylinder (3) extending out of the positioning jig (1) is connected with an inner expansion driving device (6) for driving the inner expansion driving cylinder (3) to move in the axial direction of the radially inner expansion elastic piece (2).
5. The clamping mechanism according to claim 4, wherein the internal expansion driving device (6) comprises a moving frame (60) connected with one end of the internal expansion driving cylinder (3) extending out of the positioning jig (1), an internal expansion driver (61) connected with the moving frame (60) is fixed on the positioning jig (1), and the internal expansion driver (61) drives the internal expansion driving cylinder (3) connected with the moving frame (60) to axially move.
6. The clamping mechanism according to claim 1, wherein one end of the compression driving rod (5) close to the positioning jig (1) extends out of the positioning jig (1), and a compression driver (7) connected with one end of the compression driving rod (5) extending out of the positioning jig (1) is fixed on the positioning jig (1).
7. Clamping method, using a clamping mechanism according to any of claims 1-6, characterized in that the method comprises the steps of:
s1, placing, namely placing a metal frame (a) on a positioning surface of a positioning jig (1);
s2, radial tensioning, wherein the inner tensioning driving cylinder (3) moves in a set tensioning direction, so that an elastic part (21) of the radial inner tensioning elastic piece (2) is forced to deform radially outwards and drive an inner tensioning block (22) to displace radially outwards, and finally the inner tensioning block (22) is in contact with the inner wall of the metal frame (a) for tensioning;
s3, axially locking, wherein the compression driving rod (5) moves towards the axial locking direction, so that the axial compression piece (4) is forced to be close to the metal frame (a) in the step S2, and is pressed at the other axial end of the metal frame (a) away from the positioning jig (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111619020 | 2021-12-27 | ||
| CN2021116190203 | 2021-12-27 |
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| CN114346937A CN114346937A (en) | 2022-04-15 |
| CN114346937B true CN114346937B (en) | 2024-02-27 |
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| CN202210077548.0A Active CN114346937B (en) | 2021-12-27 | 2022-01-24 | Clamping mechanism and clamping method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371375A (en) * | 2011-09-14 | 2012-03-14 | 洛阳德平机械设备有限公司 | Internal expanding tensioning mechanism of pipeline facing machine |
| DE202013104225U1 (en) * | 2013-09-16 | 2013-10-08 | Alfred Härer GmbH | clamping device |
| CN211072624U (en) * | 2019-09-30 | 2020-07-24 | 安川首钢机器人有限公司 | Positioning tensioning device and sleeve positioning equipment |
| CN212330421U (en) * | 2020-04-24 | 2021-01-12 | 台州成春自动化设备有限公司 | Flange tool |
| CN212665610U (en) * | 2020-05-31 | 2021-03-09 | 江苏双环齿轮有限公司 | Clamp for accurately grinding excircle |
| CN113770404A (en) * | 2021-10-11 | 2021-12-10 | 重庆华渝电气集团有限公司 | Lathe internal expanding clamp |
-
2022
- 2022-01-24 CN CN202210077548.0A patent/CN114346937B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371375A (en) * | 2011-09-14 | 2012-03-14 | 洛阳德平机械设备有限公司 | Internal expanding tensioning mechanism of pipeline facing machine |
| DE202013104225U1 (en) * | 2013-09-16 | 2013-10-08 | Alfred Härer GmbH | clamping device |
| CN211072624U (en) * | 2019-09-30 | 2020-07-24 | 安川首钢机器人有限公司 | Positioning tensioning device and sleeve positioning equipment |
| CN212330421U (en) * | 2020-04-24 | 2021-01-12 | 台州成春自动化设备有限公司 | Flange tool |
| CN212665610U (en) * | 2020-05-31 | 2021-03-09 | 江苏双环齿轮有限公司 | Clamp for accurately grinding excircle |
| CN113770404A (en) * | 2021-10-11 | 2021-12-10 | 重庆华渝电气集团有限公司 | Lathe internal expanding clamp |
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| Publication number | Publication date |
|---|---|
| CN114346937A (en) | 2022-04-15 |
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