CN115070468A - Multi-station automatic rotating and positioning structure - Google Patents
Multi-station automatic rotating and positioning structure Download PDFInfo
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- CN115070468A CN115070468A CN202210847814.3A CN202210847814A CN115070468A CN 115070468 A CN115070468 A CN 115070468A CN 202210847814 A CN202210847814 A CN 202210847814A CN 115070468 A CN115070468 A CN 115070468A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 125000006850 spacer group Chemical group 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 230000001174 ascending effect Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
- B23Q7/02—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of drums or rotating tables or discs
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Abstract
The invention relates to the field of jigs, in particular to a multi-station automatic rotating and positioning structure which comprises a CNC base, a rotating pull-down cylinder and a product positioning module, wherein a driving end of the rotating pull-down cylinder penetrates through the CNC base and is sequentially connected with a cylinder connecting rod and a floating pull head; the CNC base upper surface still is equipped with the disc subassembly, the disc upper surface is equipped with the draw-in groove that holds unsteady pull head both ends, the CNC base still installs spacer pin and location and detains, disc lower surface both sides are equipped with the arc spacing groove, are equipped with the constant head tank all around, unsteady pull head both ends joint is in the draw-in groove of disc upper surface. The multi-station automatic rotating and positioning structure is driven by a rotating pull-down cylinder, and the positioning accuracy reaches 0.01mm by combining a positioning buckle and a clamping groove of a disc; the disk is flexibly propped by the floating pin and the rolling steel ball, so that the stability of the whole structure in ascending, descending and rotating is improved; in addition, increase the sealing washer structure, make the structure adapt to dust environment and use.
Description
Technical Field
The invention relates to the field of jigs, in particular to a multi-station automatic rotating and positioning structure.
Background
At present, the shell of the Bluetooth earphone needs to process 5 surfaces with the processing precision of 5 surfaces being +/-0.02 mm, and the repeated positioning precision of a mechanism being +/-0.01 mm. The existing market scheme is that a standard 5-axis CNC or a modified single-station 4.5-axis power tool handle is used, so that the equipment cost is high, and the efficiency is low.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-station automatic rotating and positioning structure, which solves the problems of high cost and low efficiency of a traditional CNC jig with a single station of 4.5 shafts.
In order to achieve the purpose, the invention adopts the technical scheme that: a multi-station automatic rotary positioning structure comprises a CNC base, a rotary pull-down cylinder and a product positioning module, wherein the rotary pull-down cylinder is arranged at the lower end of the CNC base, the product positioning module is arranged at the upper end of the CNC base, the upper end of the rotary pull-down cylinder is connected with the lower end of the CNC base through a cylinder connecting plate, and a driving end of the rotary pull-down cylinder penetrates through the CNC base and is sequentially connected with a cylinder connecting rod and a floating pull head; the utility model discloses a floating puller, including CNC base, disc subassembly, spacing pin, cylinder connecting plate, spring connecting plate, cylinder connecting plate, floating pin bottom, the upper surface of CNC base still is equipped with disc subassembly, disc subassembly includes the disc and surrounds disc safety cover all around, the disc upper surface is equipped with the draw-in groove that holds floating puller both ends, the CNC base still installs spacer pin and location and detains, disc lower surface both sides are equipped with the arc spacing groove that corresponds with the spacer pin, are equipped with all around and detain the constant head tank that corresponds with the location, floating puller both ends joint is in the draw-in groove of disc upper surface, still be equipped with spring, floating pin between cylinder connecting plate and the disc lower extreme, spring one end is connected with cylinder connecting plate upper end, the other end and the joint of floating pin bottom, floating pin upper end is equipped with the steel ball and runs through the CNC base and passes through steel ball and disc bottom contact, lower extreme and CNC base activity joint from top to bottom.
Further, the drive end of the rotary pull-down cylinder pulls down the floating pull head through the cylinder connecting rod to enable the disc to descend and the positioning buckle to be inserted into the positioning groove, at the moment, the spring is in a compression state, and after the drive end of the rotary pull-down cylinder pushes up the floating pull head through the cylinder connecting rod, the spring enables the floating pin to push up the disc under the action of elastic force and enable the positioning groove to be separated from the positioning buckle.
Further, the CNC base includes that the four-axis is connected valve flange, positioning bottom plate and backup pad, the positioning bottom plate left side is connected with the four-axis and is connected the valve flange, both sides are connected around backup pad and the positioning bottom plate, disc subassembly sets up on the positioning bottom plate.
Further, the safety cover includes upper safety cover and lower floor's safety cover, the safety cover is fixed on CNC base surface down to cup joint at the disc surface, go up the safety cover and cup joint on safety cover surface down, and the upper end is fixed with the disc, still be equipped with the sealing washer between upper safety cover and the lower floor's safety cover.
And the upper surface of the disc is also provided with a jig connecting pin used for being connected with the product positioning module.
Further, the product location module includes product fixing base, product locating piece and apron, the apron is connected with the product fixing base side, the product locating piece sets up between product fixing base and apron, another side-mounting of product fixing base has the vacuum to inhale the air inlet, the air pipe head is installed to the vacuum to inhale the air inlet.
The two side edges of the cover plate are respectively inserted with a bushing, and the bushing is provided with a bushing hole convenient for a manipulator to grab.
The bottom of the product fixing seat is provided with an extending part in the horizontal direction, the surface of the extending part is provided with a connecting hole, and the side surface of the extending part is also provided with an air pipe pressing buckle.
The positioning device comprises a product fixing seat, a cover plate and a product positioning block, wherein a guide pin is arranged between the product fixing seat and the cover plate, and a positioning pin is arranged between the product positioning block and the cover plate.
Further, a speed regulating valve is arranged on the surface of the rotary pull-down cylinder.
The invention has the beneficial effects that: the multi-station automatic rotating and positioning structure is driven by a rotating pull-down cylinder, and the positioning accuracy reaches 0.01mm by combining a positioning buckle and a clamping groove of a disc; the disk is flexibly propped by the floating pin and the rolling steel ball, so that the stability of the whole structure in ascending, descending and rotating is improved; in addition, increase the sealing washer structure, make the structure adapt to dust environment and use to the supplementary spacer pin of ingenious setting improves structure life.
Drawings
Fig. 1 is a schematic view of the overall positioning structure of the present embodiment.
Fig. 2 is a schematic structural diagram of the product positioning module according to the embodiment.
Fig. 3 is another schematic structural diagram of the product positioning module according to the embodiment.
FIG. 4 is a schematic diagram of the operation of the B surface of the tension disc processed product of the embodiment.
Fig. 5 is a schematic view of the operation of the a-plane of the CNC four-axis rotary processed product of the present embodiment.
Fig. 6 is a schematic diagram of the action of the D-plane of the CNC four-axis rotational processing product of the embodiment.
Fig. 7 is a schematic diagram of the action structure of the CNC four-axis rotation and the pushing-up of the cylinder driving end in the embodiment.
FIG. 8 is a schematic view of the operation of the tensioning disc processing product C surface.
Fig. 9 is a schematic diagram of the operation of the E-plane of the CNC four-axis rotational processing product according to the embodiment.
Fig. 10 is a schematic structural view of the CNC base, the rotary pull-down cylinder and the disc assembly of the present embodiment.
Fig. 11 is an exploded view of the rotational positioning structure of the present embodiment.
Fig. 12 is a schematic structural view of the positioning base plate, the rotary pull-down cylinder, and the disc assembly of the present embodiment.
Fig. 13 is a schematic structural view of the disc of the present embodiment.
Figure 14 is a cross-sectional view of the positioning baseplate, rotary pull-down cylinder and disc assembly of this embodiment.
Figure 15 is another cross-sectional view of the positioning baseplate, rotary pull-down cylinder and disc assembly of the present embodiment.
Fig. 16 is an exploded view of the product positioning module according to the present embodiment.
The reference numbers illustrate: 1, CNC base; 11. the four shaft is connected with a valve flange; 12. positioning the bottom plate; a support plate; 2. rotating the pull-down cylinder; 21. a cylinder connecting plate; 22. a cylinder connecting rod; 23. a floating slider; 24. a speed regulating valve; 3. a product positioning module; 31. a product fixing seat; 311. a vacuum suction inlet; 312. a gas pipe joint; 313. an extension portion; 3131. connecting holes; 3132. pressing and buckling the trachea; 32. a product positioning block; 33. a cover plate; 331. a bushing; 332. a bushing hole; 34. a guide pin; 35. positioning pins; 4. a disc assembly; 41. a disc; 411. a card slot; 412. a limiting groove; 413. positioning a groove; 42. a protective cover; 421. an upper protective cover; 422. a lower protective cover; 423. a seal ring; 5, limiting pins; 6. positioning buckles; 7. a spring; 8. a floating pin; 9. steel balls; 10. and a jig connecting pin.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.
Referring to fig. 1 to 16, the invention relates to a multi-station automatic 90-degree rotation positioning structure, which includes a CNC base 1, a rotary pull-down cylinder 2 and a product positioning module 3, wherein the rotary pull-down cylinder 2 is arranged at the lower end of the CNC base 1, the product positioning module 3 is arranged at the upper end of the CNC base 1, the upper end of the rotary pull-down cylinder 2 is connected with the lower end of the CNC base 1 through a cylinder connecting plate 21, and the driving end of the rotary pull-down cylinder 2 penetrates through the CNC base 1 and is sequentially connected with a cylinder connecting rod 22 and a floating slider 23; the upper surface of the CNC base 1 is also provided with a disc assembly 4, the disc assembly 4 comprises a disc 41 and a protective cover 42 surrounding the circumference of the disc 41, the upper surface of the disc 41 is provided with a clamping groove 411 for accommodating two ends of the floating pull head 23, the CNC base 1 is also provided with a limiting pin 5 and a positioning buckle 6, the two sides of the lower surface of the disc 41 are provided with arc-shaped limit grooves 412 corresponding to the limit pins 5, the periphery is provided with positioning grooves 413 corresponding to the positioning buckles 6, two ends of the floating pull head 23 are clamped in the clamping grooves 411 on the upper surface of the disc 41, a spring 7 and a floating pin 8 are arranged between the cylinder connecting plate 21 and the lower end of the disc 41, one end of the spring 7 is connected with the upper end of the cylinder connecting plate 21, the other end is clamped with the bottom of the floating pin 8, the upper end of the floating pin 8 is provided with a steel ball 9 and penetrates through the CNC base 1 to be in contact with the bottom of the disc 41 through the steel ball 9, and the lower end of the floating pin is movably clamped with the CNC base 1 up and down. Wherein, the surface of the rotary pull-down cylinder 2 is provided with a speed regulating valve 24.
Preferably, the present embodiment uses 8 springs 7 and floating pins 8, and the head of the floating pin 8 is provided with a movable steel ball 9 for pushing up the disc 41, so as to ensure the stability of the disc 41 in ascending, descending and rotating. The multi-station automatic 90-degree rotation positioning structure of the embodiment adopts 4 positioning grooves 413 and 4 positioning buckles 6 to match the XY direction of the positioning mechanism, so that the positioning precision is 0.01mm, and the repeated positioning precision is 0.01 mm. Wherein, the driving end of the rotary pull-down cylinder 2 pulls down the floating slider 23 through the cylinder connecting rod 22 to make the disc 41 descend and the positioning buckle 6 is inserted into the positioning groove 413, so that the disc 41 is leveled with the positioning bottom plate 12 of the CNC base 1, at this time, the spring 7 is in a compressed state, after the driving end of the rotary pull-down cylinder 2 pushes up the floating slider 23 through the cylinder connecting rod 22, the spring 7 makes the floating pin 8 push up the disc 41 under the action of elasticity and the positioning groove 413 is separated from the positioning buckle 6. In the present embodiment, the spring 7 has a spring constant of 0.3N/mm, a pre-pressure of 10mm, a pre-pressure of 3X8 of 24N, and a post-cylinder-tensioning spring force of 4.5X8 of 36N.
In this embodiment, the CNC base 1 includes four-axis connection valve flange 11, positioning bottom plate 12 and backup pad 13, positioning bottom plate 12 left side is connected with four-axis connection valve flange 11, backup pad 13 and positioning bottom plate 12 front and back both sides are connected, disc assembly 4 sets up on positioning bottom plate 12. Wherein, the safety cover 42 includes upper protection cover 421 and lower floor's safety cover 422, lower protection cover 422 is fixed on CNC base 1 surface to cup joint at disc 41 surface, last safety cover 421 cup joints on lower protection cover 422 surface, and the upper end is fixed with disc 41, still be equipped with sealing washer 423 between upper protection cover 421 and the lower floor's safety cover 422, make the structure adapt to dust environment and use.
In this embodiment, product positioning module 3 includes product fixing base 31, product locating piece 32 and apron 33, apron 33 and 31 side swing joint of product fixing base, product locating piece 32 sets up between product fixing base 31 and apron 33, the vacuum air inlet 311 is installed to 31 another side-mounting of product fixing base, air pipe joint 312 is installed to vacuum air inlet 311. The product positioning block is characterized in that two side edges of the cover plate 33 are respectively inserted with a bushing 331, the bushing 331 is provided with a bushing hole 332 convenient for a manipulator to grab, a guide pin 34 is arranged between the product fixing seat 31 and the cover plate 33 and connected through the guide pin 34, and a positioning pin 35 is arranged between the product positioning block 32 and the cover plate 33 and positioned through the positioning pin 35. In addition, the bottom of the product fixing seat 31 is provided with an extending portion 313 in the horizontal direction, the surface of the extending portion 313 is provided with a connecting hole 3131, the side surface of the extending portion 313 is further provided with an air pipe pressing buckle 3132, and the upper surface of the disc 41 is further provided with a jig connecting pin 10 for connecting with the connecting hole 3131 of the product positioning module 3.
When the product positioning module 3 is used, a product is manually assembled on the product positioning block 32, then the four lining holes 332 on the side edge of the cover plate 33 are grabbed by the mechanical arm, the positioning pins 35 of the product fixing seat 31 are then assembled, the action of assembling the cover plate 33 into the product fixing seat 31 is completed, finally the cover plate 33 is tightly adsorbed by the vacuum adsorption air inlet 311, and the mechanical arm is matched to realize automatic production.
The positioning structure of the embodiment has the following working procedures: in the initial state, 0 °, the rotary pull-down cylinder 2 is tightened → the upper cover plate 33 is installed, vacuum suction → machining of the front, back and back sides → rotation of the upper top of the rotary pull-down cylinder 2 by 90 ° → machining of both side surfaces → rotation of the upper top of the rotary pull-down cylinder 2 by-90 ° → breaking of the vacuum suction, and removal of the cover plate 33 → circulation.
As better embodiment, can adorn 4 groups of disc subassemblies 4 and product location module 3 on the location bottom plate 12 of CNC base 1, use the characteristics of five faces of present four-axis CNC board processing, the automatic 90 degrees accurate positioning structure of rotatory in four caves of this embodiment, simple structure, easy operation, repeated positioning accuracy 0.01mm, once the clamping can process A, B, C, D, E five faces, cooperation manipulator realizes automated production, for example the cooperation equipment during operation, the action process is as follows:
1) and (3) tensioning the disc 41 under the pressure of 0.5 MPa by rotating the pull-down cylinder 2 under the pull-down force F1 of 40KG, and processing the surface B of the product, as shown in FIG. 4.
2) The CNC four-axis pivot is 90 degrees clockwise, and the processing product A face is like figure 5.
3) The CNC four-axis pivot is 90 degrees clockwise, and processing product D face, as figure 6.
4) The CNC four-axis pivot anticlockwise rotation 180, under 0.5 megapascal atmospheric pressure, rotatory pull-down cylinder 2 pushes up thrust F2 for 20KG, and the flexible dish 41 that withstands of floating pin 8 and rolling steel ball 8, and dish 41 constant head tank 413 breaks away from location and detains 6, as figure 7.
5) Under the pressure of 0.5 mpa, the thrust F3 of the rotary pull-down cylinder 2 is 10KG, the disc 41 is rotated 90 ° clockwise, and after the disc is rotated to the proper position, the pull F1 of the rotary pull-down cylinder 2 is 40KG, the disc is tensioned, and the surface C of the product is processed, as shown in fig. 8.
6) The CNC four-axis rotating shaft rotates clockwise by 180 degrees, and the E surface of the product is machined, as shown in figure 9.
7) And resetting in sequence after the processing is finished.
It is further understood that the terms "connected," "secured," "disposed," and the like are to be construed broadly and their meanings in the context of the invention may be understood by those skilled in the art as appropriate, unless otherwise specifically defined or limited.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.
Claims (10)
1. The utility model provides a multistation autogiration location structure which characterized in that: the device comprises a CNC base, a rotary pull-down cylinder and a product positioning module, wherein the rotary pull-down cylinder is arranged at the lower end of the CNC base, the product positioning module is arranged at the upper end of the CNC base, the upper end of the rotary pull-down cylinder is connected with the lower end of the CNC base through a cylinder connecting plate, and a driving end of the rotary pull-down cylinder penetrates through the CNC base and is sequentially connected with a cylinder connecting rod and a floating pull head; the CNC base upper surface still is equipped with the disc subassembly, the disc subassembly includes the disc and surrounds disc safety cover all around, the disc upper surface is equipped with the draw-in groove that holds unsteady pull head both ends, the CNC base still installs spacer pin and location knot, disc lower surface both sides are equipped with the arc spacing groove that corresponds with the spacer pin, are equipped with the constant head tank that corresponds with the location knot all around, unsteady pull head both ends joint is in the draw-in groove of disc upper surface, still be equipped with spring, unsteady round pin between cylinder connecting plate and the disc lower extreme, spring one end is connected with cylinder connecting plate upper end, the other end and unsteady round pin bottom joint, unsteady round pin upper end is equipped with the steel ball and runs through the CNC base and passes through steel ball and disc bottom contact, lower extreme and CNC base activity joint from top to bottom.
2. The multi-station automatic rotational positioning structure according to claim 1, wherein: the drive end of the rotary pull-down cylinder pulls down the floating pull head through the cylinder connecting rod to enable the disc to descend and the positioning buckle to be inserted into the positioning groove, at the moment, the spring is in a compression state, and after the drive end of the rotary pull-down cylinder pushes up the floating pull head through the cylinder connecting rod, the spring enables the floating pin to push up the disc under the action of elastic force and the positioning groove is separated from the positioning buckle.
3. The multi-station automatic rotational positioning structure according to claim 1, wherein: the CNC base includes that the four-axis is connected valve flange, positioning bottom plate and backup pad, the positioning bottom plate left side is connected with the four-axis and is connected the valve flange, both sides are connected around backup pad and the positioning bottom plate, disc subassembly sets up on the positioning bottom plate.
4. The multi-station automatic rotational positioning structure according to claim 1, wherein: the safety cover includes upper safety cover and lower floor's safety cover, the safety cover is fixed on CNC base surface down to cup joint at the disc surface, go up the safety cover and cup joint on safety cover surface down, and the upper end is fixed with the disc, still be equipped with the sealing washer between upper safety cover and the lower floor's safety cover.
5. The multi-station automatic rotational positioning structure according to claim 1, wherein: the upper surface of the disc is also provided with a jig connecting pin used for being connected with the product positioning module.
6. The multi-station automatic rotational positioning structure according to claim 1, wherein: the product positioning module comprises a product fixing seat, a product positioning block and a cover plate, wherein the cover plate is connected with the side face of the product fixing seat, the product positioning block is arranged between the product fixing seat and the cover plate, a vacuum suction air inlet is arranged on the other side face of the product fixing seat, and an air pipe connector is arranged at the vacuum suction air inlet.
7. The multi-station automatic rotational positioning structure according to claim 6, wherein: the two side edges of the cover plate are respectively inserted with a bushing, and the bushing is provided with a bushing hole convenient for the mechanical arm to grab.
8. The multi-station automatic rotational positioning structure according to claim 6, wherein: the bottom of the product fixing seat is provided with an extension part in the horizontal direction, the surface of the extension part is provided with a connecting hole, and the side surface of the extension part is also provided with an air pipe pressing buckle.
9. The multi-station automatic rotational positioning structure according to claim 6, wherein: a guide pin is arranged between the product fixing seat and the cover plate, and a positioning pin is arranged between the product positioning block and the cover plate.
10. The multi-station automatic rotational positioning structure according to claim 1, wherein: and a speed regulating valve is arranged on the surface of the rotary pull-down cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210847814.3A CN115070468B (en) | 2022-07-19 | 2022-07-19 | Multi-station automatic rotary positioning structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210847814.3A CN115070468B (en) | 2022-07-19 | 2022-07-19 | Multi-station automatic rotary positioning structure |
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| CN115070468A true CN115070468A (en) | 2022-09-20 |
| CN115070468B CN115070468B (en) | 2023-12-22 |
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| CN202210847814.3A Active CN115070468B (en) | 2022-07-19 | 2022-07-19 | Multi-station automatic rotary positioning structure |
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