CN216802594U - Overturning self-positioning structure and tool clamp - Google Patents

Abstract

The application provides a self-align structure and frock clamp overturn relates to anchor clamps technical field. The overturning self-positioning structure comprises a base, a clamping barrel, a positioning seat and a lifting overturning module. The overturning self-positioning structure clamps a workpiece through the clamping barrel, and the lifting overturning module can drive the clamping barrel to lift and overturn for displacement. After the lifting turnover module drives the clamping cylinder to complete turnover, a first positioning reference surface on the positioning part of the clamping cylinder corresponds to a second positioning reference surface, if a certain error exists in the turnover angle of the clamping cylinder, a certain included angle exists between the first positioning reference surface and the second positioning reference surface, when the lifting turnover module drives the clamping cylinder to descend, under the action of gravity of the clamping cylinder, the first positioning reference surface can gradually contact and approach the second positioning reference surface, and finally the second positioning reference surface can automatically form surface matching with the corresponding first positioning reference surface, so that automatic correction and positioning of the clamping cylinder are completed.

Description

Overturning self-positioning structure and tool clamp

Technical Field

The application relates to the technical field of clamps, in particular to a turnover self-positioning structure and a tool clamp.

Background

In the prior art, in order to improve the processing precision and efficiency of the standard knot of the tower crane, the standard knot is processed after being welded. Because the size and the weight of the welded standard knot are large, the hole surfaces of the end parts of the four main chord rods of the standard knot are usually machined in a horizontal clamping mode in machine tool equipment. The standard knots need to be turned over in the machining process, and the turning mode adopted at present is auxiliary turning of a plurality of gantry cranes or turning of a turning positioner is additionally arranged.

The auxiliary overturning of the gantry crane needs a large operation space, and the standard knot needs to be repositioned and clamped, so that the machining precision can be reduced. Adopt the upset machine of shifting to overturn, because there is the fit clearance between the upset drive mechanism, consequently the position precision of the standard festival after the upset can not accurate control, and then leads to machining error, can make the standard festival unable use when serious.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a self-align structure and frock clamp overturn for solve not enough that exist among the prior art.

In order to achieve the above object, in a first aspect, the present application provides a turnover self-positioning structure, which includes a base, a clamping cylinder, a positioning seat, and a lifting turnover module;

the lifting turnover module is arranged on the base;

the clamping cylinder is horizontally arranged on the lifting turnover module and used for clamping workpieces, one end of the clamping cylinder is provided with a positioning part, and the peripheral surface of the positioning part is provided with a plurality of first positioning reference surfaces;

the positioning seat is arranged on the base and positioned below the clamping barrel, and a second positioning reference surface corresponding to the first positioning reference surface is arranged on one side, facing the positioning part, of the positioning seat;

when the lifting turnover module drives the clamping cylinder to descend, the second positioning reference surface can automatically form surface matching with the corresponding first positioning reference surface.

With reference to the first aspect, in a possible implementation manner, two ends of the clamping tube are respectively provided with one positioning portion, and two positioning seats are provided and are respectively arranged corresponding to the positioning portions.

With reference to the first aspect, in one possible implementation, a plurality of the first positioning reference surfaces are uniformly distributed along a circumferential direction of the positioning portion.

With reference to the first aspect, in one possible embodiment, the number of the first positioning reference surfaces is set to be n, and an included angle formed between two adjacent first positioning reference surfaces is C, where C is 180 ° -360 °/n, and n is greater than or equal to 2.

With reference to the first aspect, in one possible implementation, the outer periphery of the positioning portion has a plurality of side wall surfaces, each side wall surface is provided with at least one first positioning reference block, and the first positioning reference block is formed with the first positioning reference surface.

With reference to the first aspect, in a possible implementation manner, at least one second positioning reference block is disposed on one side of the positioning seat, which faces the positioning portion, and the second positioning reference block is formed with the second positioning reference surface.

With reference to the first aspect, in a possible implementation manner, at least one positioning assembly is further disposed on the positioning seat, and the positioning assembly includes a positioning pin and a driving member;

the second positioning reference surface is provided with a guide hole, and the positioning pin is inserted into the guide hole;

the driving piece is arranged in the positioning seat and connected with the positioning pin;

the first positioning datum plane is provided with a positioning hole corresponding to the positioning pin, and the driving piece can drive the positioning pin to be inserted into the positioning hole.

With reference to the first aspect, in one possible implementation manner, the lifting and overturning module includes a lifting mechanism and an overturning mechanism, the lifting mechanism is disposed on the base, the overturning mechanism is disposed on the lifting mechanism, and the clamping barrel is horizontally disposed on the overturning mechanism;

the lifting mechanism can drive the turnover mechanism and the clamping cylinder to lift together, and the turnover mechanism can drive the clamping cylinder to rotate around the axis of the turnover mechanism.

With reference to the first aspect, in a possible implementation manner, the turnover mechanism includes a turnover seat, and a driving motor and two friction wheel sets that are arranged on the turnover seat;

the clamping cylinder is characterized in that a turnover plate is arranged on the outer peripheral surface of the clamping cylinder, the turnover plate is abutted to the friction wheel set, the driving motor is connected with one of the friction wheel sets, and the driving motor can drive the clamping cylinder to rotate through the corresponding friction wheel set.

In a second aspect, the present application further provides a tooling fixture including a flip self-locating structure as provided in the first aspect above.

Compare in prior art, the beneficial effect of this application:

the application provides a self-align structure and frock clamp overturn, wherein, the self-align structure of upset includes base, clamping barrel, positioning seat and lift upset module. The workpiece is clamped through the clamping barrel, and the clamping barrel can be driven to lift and turn over to shift by the lifting and turning module. After the lifting and overturning module drives the clamping cylinder to complete overturning, a first positioning reference surface on the positioning part of the clamping cylinder corresponds to a second positioning reference surface, if certain errors exist in the overturning angle of the clamping cylinder, a certain included angle exists between the first positioning reference surface and the second positioning reference surface, when the lifting and overturning module drives the clamping cylinder to descend, under the action of gravity of the clamping cylinder, the first positioning reference surface can gradually contact and approach the second positioning reference surface, and finally the second positioning reference surface can automatically form surface matching with the corresponding first positioning reference surface, so that automatic correction and positioning of the clamping cylinder are completed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic perspective view illustrating a tool holder in an inverted state according to an embodiment of the present disclosure;

fig. 2 is a schematic perspective view illustrating a tooling fixture for completing turning positioning according to an embodiment of the present disclosure;

FIG. 3 is a schematic perspective view of a clamping cylinder of the tooling fixture of FIG. 2;

FIG. 4 is a schematic perspective view of the positioning socket of the tooling fixture of FIG. 2;

fig. 5 is a schematic view illustrating a matching structure of a clamping cylinder and a lifting turnover module provided by an embodiment of the application;

fig. 6 shows a schematic perspective structure of a lifting and overturning module provided in an embodiment of the present application.

Description of the main element symbols:

100-a workpiece; 200-a base; 210-a fender bracket; 300-clamping the cylinder; 301-a clamping chamber; 310-a positioning section; 310 a-a first positioning reference plane; 311-first positioning reference block; 312-locating holes; 320-overturning the plate; 400-positioning seat; 400 a-a second positioning reference plane; 410-a positioning assembly; 411-a locating pin; 412-a drive member; 420-a second positioning reference block; 421-guide hole; 500-lifting and overturning module; 510-a lifting mechanism; 511-a lift executive component; 512-a guide shaft; 520-a turnover mechanism; 521-a turning seat; 5210-a limiting groove; 522-drive motor; 523-friction wheel set; 5230-friction wheel body; 5231 rotating shaft.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example one

Referring to fig. 1 and fig. 2, the present embodiment provides a tooling fixture, which is used for clamping a workpiece 100, so that a machine tool can machine the workpiece 100.

In this embodiment, the workpiece 100 to be clamped is selected as a standard joint of a tower crane, and the tool clamp can horizontally clamp the standard joint to expose parts to be machined at two ends of the standard joint.

In this embodiment, the fixture includes a clamping fixing structure and a self-positioning structure for flipping, wherein the self-positioning structure for flipping includes a base 200, a clamping cylinder 300, a positioning seat 400 and a lifting flipping module 500.

The base 200 is disposed on a foundation, the lifting and turning module 500 is disposed on the base 200, and the lifting and turning module 500 can perform lifting and turning actions.

Referring to fig. 3, the clamping cylinder 300 is horizontally disposed on the lifting and overturning module 500, the clamping cylinder 300 has a clamping cavity 301 along its axis, and the clamping cavity 301 has a clamping and fixing structure for horizontally positioning the standard knot in the clamping cavity 301 of the clamping cylinder 300. From this, lift upset module 500 can drive clamping section of thick bamboo 300 and drive the standard festival and go up and down and the upset motion in the lump, and wherein, clamping section of thick bamboo 300 carries out the upset motion and rotates around the axis of self to lift upset module 500 can control clamping section of thick bamboo 300 pivoted angle.

In some embodiments, the clamping and fixing structure can adopt a plurality of bolts and a plurality of pressure plates to cooperate to clamp and position the standard knot.

Further, in the present embodiment, the two ends of the chuck 300 are respectively provided with a positioning portion 310, and the outer peripheral surface of the positioning portion 310 is provided with a plurality of first positioning reference surfaces 310a, wherein the first positioning reference surfaces 310a are planes.

Alternatively, the plurality of first positioning reference surfaces 310a are uniformly distributed along the circumferential direction of the positioning part 310.

In some embodiments, the number of the first positioning reference surfaces 310a is set to be n, and an included angle formed between two adjacent first positioning reference surfaces 310a is C, where C is 180 ° -360 °/n, and n is greater than or equal to 2.

It can be understood that the workpiece 100 clamped in the embodiment is a standard knot, the standard knot is a rectangular truss structure, and the positions to be processed are the surfaces at two ends of the four main strings and the pin holes. The standard knot has four side surfaces, and in the present embodiment, the number of the first positioning reference surfaces 310a is also four, that is, n is 4, so that the included angle C between two adjacent first positioning reference surfaces 310a is 90 °. Therefore, when the main chords on the four sides of the standard knot need to be sequentially provided with pin holes or end faces, the clamping cylinders 300 can be driven by the lifting and overturning module 500 to intermittently and sequentially rotate by 90 degrees for switching.

Alternatively, the positioning portion 310 is provided as a hollow regular quadrangular prism structure, and four side surfaces of the positioning portion 310 correspond to four first positioning reference surfaces 310a, respectively.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, in the present embodiment, two positioning seats 400 are provided, two positioning seats 400 are both disposed on the base 200, the two positioning seats 400 respectively correspond to the positioning portions 310 at two ends of the clamping barrel 300, and the positioning seats 400 are located below the positioning portions 310 corresponding to the clamping barrel 300.

For a clearer description of the technical solution of the present application, two positioning bases 400 are alternatively described below. In this embodiment, a second positioning reference surface 400a is disposed on a side of the positioning seat 400 facing the positioning portion 310, the second positioning reference surface 400a corresponds to the first positioning reference surface 310a, and the second positioning reference surface 400a can form a surface fit with the first positioning reference surface 310a to position the clamping cylinder 300.

The principle of turning over and self-positioning of the tool clamp is as follows:

when the other side surface of the standard knot needs to be switched for processing, firstly, the lifting and overturning module 500 drives the clamping barrel 300 to ascend so that a first positioning datum plane 310a corresponding to the positioning part 310 is separated from the positioning seat 400 by a certain distance, so as to avoid interference in movement during subsequent overturning; the lifting and turning module 500 drives the clamping barrel 300 to turn 90 degrees around the axis of the clamping barrel, and then the clamping barrel is converted into another first positioning reference surface 310a facing the base 200, so that the first positioning reference surface 310a corresponds to the second positioning reference surface 400a, and then turning and displacement are completed.

Next, the lifting and inverting module 500 drives the clamping cylinder 300 to descend, that is, the clamping cylinder 300 moves towards the direction approaching the base 200, at this time, the corresponding first positioning reference surface 310a and the second positioning reference surface 400a approach each other, and finally, the first positioning reference surface 310a and the second positioning reference surface 400a contact and are attached to form a surface fit. Therefore, the rotation of the clamping cylinder 300 can be limited through surface matching, and the side to be processed of the standard knot in the clamping cylinder 300 faces to a cutter of a processing machine tool to finish positioning so as to wait for processing.

It can be understood that, in the process of executing the turning action of the lifting and turning module 500, a certain gap exists in the transmission process of the power in the mechanical structure, and a certain error exists, so that the first positioning reference plane 310a is not directly opposite to the second positioning reference plane 400a after the clamping cylinder 300 is turned over, and a certain included angle is formed between the first positioning reference plane 310a and the second positioning reference plane 400 a. Therefore, when the lifting and overturning module 500 drives the clamping cylinder 300 to descend, the first positioning reference surface 310a is in line contact with the second positioning reference surface 400a first, and in the process that the clamping cylinder 300 continues to descend under the action of gravity of the clamping cylinder 300, the first positioning reference surface 310a and the second positioning reference surface 400a gradually approach each other, so that the included angle between the first positioning reference surface 310a and the second positioning reference surface 400a is gradually reduced, and finally, the first positioning reference surface 310a can be automatically attached to the second positioning reference surface 400a, so that surface contact is realized, and automatic correction and positioning are further completed.

Referring to fig. 2, fig. 3 and fig. 4, further, at least one positioning assembly 410 is disposed on the positioning base 400. In this embodiment, two positioning assemblies 410 are disposed on each positioning socket 400, and the positioning assemblies 410 are used for limiting the cartridge 300 from sliding on the positioning socket 400.

Specifically, the positioning assembly 410 includes a positioning pin 411 and a driving member 412. Correspondingly, a guide hole 421 is formed in the second positioning reference surface 400a, the positioning pin 411 is inserted into the guide hole 421, and the driving member 412 is disposed in the positioning seat 400 and connected to the positioning pin 411.

Optionally, a shaft sleeve is arranged in the guide hole 421, and the positioning pin 411 is in clearance fit with the shaft sleeve, so that friction force is reduced, and resistance to movement of the positioning pin 411 is reduced.

In some embodiments, the bushing may be replaced with a linear bearing.

The first positioning reference surface 310a is provided with a positioning hole 312 corresponding to the positioning pin 411, and the driving element 412 can drive the positioning pin 411 to be inserted into the positioning hole 312.

Optionally, the positioning hole 312 is a blind hole to prevent the positioning pin 411 from being inserted into the clamping cavity 301 of the clamping barrel 300.

Optionally, the positioning hole 312 is a tapered hole to facilitate insertion of the positioning pin 411.

Optionally, the end of the positioning pin 411 is a cone structure and the top is a blunt end to facilitate insertion into the positioning hole 312 while avoiding damage to the first positioning reference surface 310 a.

In some embodiments, the driving member 412 is a spring, one end of the spring abuts against the positioning pin 411, and the other end of the spring abuts against the bottom of the guiding hole 421, so that the positioning pin 411 can extend out of the guiding hole 421 under the urging of the spring.

In other embodiments, the driver 412 is a pneumatic cylinder. The piston rod end of the air cylinder is connected with the positioning pin 411, and the positioning pin 411 is driven to extend out of the guide hole 421 through the piston rod of the air cylinder.

Example two

Referring to fig. 2, fig. 3 and fig. 4, the present embodiment provides a tooling fixture, which is an improvement made on the basis of the first embodiment, and compared with the first embodiment, the difference is that:

in the present embodiment, since the positioning portion 310 has a quadrangular prism structure, the outer periphery of the positioning portion 310 has four sidewall surfaces, and each sidewall surface is provided with at least one first positioning reference block 311. In this embodiment, the number of the first positioning reference blocks 311 is illustrated as two, but may be three, four or another number.

Wherein the top surfaces of the two first positioning reference blocks 311 are coplanar and collectively formed as a first positioning reference surface 310 a. Therefore, only the top surfaces of the two first positioning reference blocks 311 need to be milled during machining, and all the side wall surfaces of the positioning portion 310 do not need to be machined in a whole surface manner, so that the machining difficulty is reduced, the machining precision is improved, and the machining cost of the clamping barrel 300 is further reduced.

Two second positioning reference blocks 420 are disposed on one side of the positioning seat 400 facing the positioning portion 310, and the two second positioning reference blocks 420 respectively correspond to the two first positioning reference blocks 311. The top surfaces of the two second positioning reference blocks 420 together form a second positioning reference surface 400 a. Therefore, only the top surfaces of the two second positioning reference blocks 420 need to be milled during machining, the whole upper surface of the positioning seat 400 does not need to be machined, machining difficulty is reduced, machining precision is improved, positioning precision is improved, and machining cost of the positioning seat 400 is further reduced.

The first positioning reference block 311 is provided with the positioning hole 312, and the second positioning reference block 420 is provided with the guide hole 421.

EXAMPLE III

Referring to fig. 1, fig. 5 and fig. 6, the present embodiment provides a tooling fixture, which is an improvement made on the basis of the technology of the first embodiment or the second embodiment, and compared with the first embodiment or the second embodiment, the difference is that:

in this embodiment, the lifting turnover module 500 includes a lifting mechanism 510 and a turnover mechanism 520, the lifting mechanism 510 is disposed on the base 200, the turnover mechanism 520 is disposed at an output end of the lifting mechanism 510, and the clamping cylinder 300 is horizontally disposed on the turnover mechanism 520.

The lifting mechanism 510 can perform a lifting motion, so that the lifting mechanism 510 can drive the turnover mechanism 520 and the chuck 300 to lift together. The turnover mechanism 520 can output a rotation motion, so that the turnover mechanism 520 can drive the clamping cylinder 300 to rotate around the axis of the turnover mechanism, and then the standard knot installed in the clamping cylinder 300 is turned over.

The tilting mechanism 520 includes a tilting base 521, and a driving motor 522 and two friction wheel sets 523 disposed on the tilting base 521, wherein the friction wheel sets 523 include a pair of friction wheel bodies 5230 and a rotating shaft 5231 connected to the pair of friction wheel bodies 5230. The driving motor 522 is connected to the rotating shaft 5231 of one of the friction wheel sets 523 through a reducer, so that the driving motor 522 can drive the corresponding friction wheel 5230 to rotate.

The outer peripheral surface of the clamping cylinder 300 is correspondingly provided with two turnover plates 320, and the two turnover plates 320 are arranged along the axis of the clamping cylinder 300 at intervals of a preset distance. The turning plate 320 is a disc structure, and the turning plate 320 corresponds to and abuts against the friction wheel bodies 5230 of the two friction wheel sets 523 at the same time. Thus, the driving motor 522 can drive the clamping cylinder 300 to rotate around the axis thereof through the corresponding friction wheel set 523.

Further, two limiting grooves 5210 are formed in the flipping base 521, and the two friction wheel bodies 5230 are respectively disposed in the corresponding limiting grooves 5210. Therefore, when the two turning plates 320 contact the friction wheel 5230, the turning plates 320 are also received in the corresponding limiting grooves 5210, and the axial movement of the clamping cylinder 300 can be limited.

Optionally, the width of the limiting groove 5210 is adapted to the thickness of the flipping plate 320, thereby improving the accuracy of axial limiting.

In some embodiments, universal ball bearings are disposed on two sides of the limiting groove 5210, and the universal ball bearings are in rolling fit with the side wall surfaces of the flipping plate 320, so that the rotation resistance of the flipping plate 320 is reduced, the flipping plate 320 is prevented from being worn, and the service life is prolonged.

The lifting mechanism 510 includes a lifting executing component 511 and a guiding shaft 512, wherein the lifting executing component 511 and the guiding shaft 512 are both disposed on the base 200, and an output end of the lifting executing component 511 is connected with the flipping base 521 for driving the flipping base 521 to lift. The guide shaft 512 penetrates through the overturning seat 521, and the guide shaft 512 is in clearance fit with the overturning seat 521 so as to improve the lifting stability of the overturning seat 521.

Further, a plurality of lifting executing components 511 and a plurality of guide shafts 512 are provided, wherein the plurality of lifting executing components 511 move synchronously. The lifting executing components 511 and the guide shafts 512 are uniformly distributed on the base 200 corresponding to the overturning seat 521, so as to improve the lifting stability of the overturning seat 521.

Optionally, the lifting executing component 511 is one of an oil cylinder, an air cylinder, a linear motor, an electric push rod, a jack, or a motor screw rod structure.

In some embodiments, as shown in fig. 1, the protection frames 210 are further disposed on two sides of the base 200, and the protection frames 210 can prevent the clamping cylinder 300 from falling off, thereby improving the safety of the device.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A turnover self-positioning structure is characterized by comprising a base, a clamping barrel, a positioning seat and a lifting turnover module;

the lifting turnover module is arranged on the base;

the clamping cylinder is horizontally arranged on the lifting turnover module and used for clamping workpieces, one end of the clamping cylinder is provided with a positioning part, and the peripheral surface of the positioning part is provided with a plurality of first positioning reference surfaces;

the positioning seat is arranged on the base and positioned below the clamping barrel, and a second positioning reference surface corresponding to the first positioning reference surface is arranged on one side, facing the positioning part, of the positioning seat;

the lifting and overturning module can drive the clamping barrel to ascend and overturn so as to enable one of the first positioning reference surfaces to correspond to the second positioning reference surface, and when the lifting and overturning module drives the clamping barrel to descend, the second positioning reference surface can automatically form surface matching with the corresponding first positioning reference surface.

2. The flip self-positioning structure according to claim 1, wherein two positioning seats are provided, and two positioning seats are provided at two ends of the clamping barrel, and are respectively disposed corresponding to the positioning parts.

3. The flip self-positioning structure according to claim 1, wherein a plurality of the first positioning reference surfaces are uniformly distributed in a circumferential direction of the positioning portion.

4. The flip self-positioning structure according to claim 3, wherein the number of the first positioning reference surfaces is n, and an included angle formed between two adjacent first positioning reference surfaces is C, where C is 180 ° -360 °/n, and n is greater than or equal to 2.

5. The flip self-positioning structure according to claim 1, wherein the positioning portion has a plurality of side wall surfaces on an outer periphery thereof, each side wall surface is provided with at least one first positioning reference block, and the first positioning reference block is formed with the first positioning reference surface.

6. The flip self-positioning structure of claim 1, wherein at least one second positioning datum block is disposed on a side of the positioning seat facing the positioning portion, and the second positioning datum block has the second positioning datum surface formed thereon.

7. The flip self-positioning structure of claim 1, wherein at least one positioning assembly is further disposed on the positioning base, and the positioning assembly comprises a positioning pin and a driving member;

the second positioning reference surface is provided with a guide hole, and the positioning pin is inserted into the guide hole;

the driving piece is arranged in the positioning seat and connected with the positioning pin;

the first positioning datum plane is provided with a positioning hole corresponding to the positioning pin, and the driving piece can drive the positioning pin to be inserted into the positioning hole.

8. The overturning self-positioning structure according to any one of claims 1 to 7, wherein the lifting and overturning module comprises a lifting mechanism and an overturning mechanism, the lifting mechanism is arranged on the base, the overturning mechanism is arranged on the lifting mechanism, and the clamping barrel is horizontally arranged on the overturning mechanism;

the lifting mechanism can drive the turnover mechanism and the clamping cylinder to lift together, and the turnover mechanism can drive the clamping cylinder to rotate around the axis of the turnover mechanism.

9. The overturning self-positioning structure of claim 8, wherein the overturning mechanism comprises an overturning seat, and a driving motor and two friction wheel sets arranged on the overturning seat;

the clamping cylinder is characterized in that a turnover plate is arranged on the outer peripheral surface of the clamping cylinder, the turnover plate is abutted to the friction wheel set, the driving motor is connected with one of the friction wheel sets, and the driving motor can drive the clamping cylinder to rotate through the corresponding friction wheel set.

10. A tooling fixture comprising a flip self-locating feature as claimed in any one of claims 1 to 9.

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