CN110645248A - Fixed positioning pin and using method thereof - Google Patents
Fixed positioning pin and using method thereof Download PDFInfo
- Publication number
- CN110645248A CN110645248A CN201910714958.XA CN201910714958A CN110645248A CN 110645248 A CN110645248 A CN 110645248A CN 201910714958 A CN201910714958 A CN 201910714958A CN 110645248 A CN110645248 A CN 110645248A
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- Prior art keywords
- pin
- pin body
- limiting block
- fixed
- clamp spring
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- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000725 suspension Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/10—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate gripping parts moved into their final position in relation to the body of the device by a separate operation
Abstract
The application discloses fixed locating pin and application method thereof, the locating pin structure includes the star handle, the screw thread round pin, round pin body stopper, flexible jump ring, housing screw, fixation nut, the star handle is fixed in screw thread round pin one end, the screw thread round pin other end inserts round pin body stopper hole, round pin body stopper is installed on first by the connecting piece, compress tightly round pin body stopper through housing screw, flexible jump ring suit is in round pin body stopper, the screw thread round pin passes the second by the connecting piece to through rather than complex fixation nut with two by the connecting piece fastening.
Description
Technical Field
The application relates to an aircraft manufacturing technology, in particular to a fixed positioning pin and a using method thereof, and further relates to manufacturing of technological equipment for aircraft production.
Background
Technological equipment (hereinafter referred to as tooling) for aircraft production is directly used for part forming and component assembly. In order to meet the requirements of mounting and dismounting of airplane parts, components and the like in the use process of the tool, the tool generally adopts a structural form which is integrally and conveniently dismounted. In the field of aircraft process equipment manufacturing, positioning pins are generally used for connecting and positioning separable parts of a tool. At present, the positioning pin in China is divided into a direct drawing-off type positioning pin and a lacing hanging type positioning pin.
The whole body of the pull-away type positioning pin and the lacing suspension type positioning pin is in an equal straight cylinder shape. The drawing-off type positioning pin is in a complete spare part state after being temporarily drawn out from the tool by the connecting piece; the tail part of the lacing suspension type positioning pin is provided with lacing such as an iron wire or a string and connected with the tool connected piece, and the lacing suspension type positioning pin is suspended on the tool through the lacing after the positioning pin is pulled out. The two types of locating pins have the following major disadvantages: firstly, the hanging lace is easy to fall off after being worn for a long time, and the same drawing-off type positioning pin as complete spare parts is inconvenient to store and place on site and is usually randomly placed on the ground nearby; and secondly, the two positioning pins are easy to shift and forget to lose, so that the resetting of the tool and the manufacturing and assembly of subsequent airplane products are influenced.
Disclosure of Invention
In order to solve the defect that the existing positioning pin is taken out of the tool and then stored and stored, the fixed positioning pin is suitable for being connected with the tool for aircraft production and needs to be repeatedly disassembled and assembled, and the using method of the fixed positioning pin is provided.
The utility model provides a fixed locating pin, includes the star handle, the threaded pin, round pin body stopper, flexible jump ring, housing screw, fixation nut, the star handle is fixed in threaded pin one end, the threaded pin other end inserts round pin body stopper hole, round pin body stopper is installed on first by the connecting piece, compress tightly round pin body stopper through housing screw, flexible jump ring suit is in round pin body stopper, the threaded pin passes the second by the connecting piece to through rather than complex fixation nut with two by the connecting piece fastening.
The screw thread round pin is by supreme preceding guide head, screw thread section of closing soon, trapezoidal slip table, round pin body guiding axle, the platform that compresses tightly down of including down, and preceding guide head sets up at foremost, is less than the initial opening size of flexible jump ring for circular cone structure and tip diameter, and the guide screw thread round pin gets into round pin body stopper. The thread screwing section is connected with the small end of the trapezoidal sliding table to form a locking clamping groove of the telescopic clamp spring, and the outer diameter of the locking clamping groove is larger than the initial opening size of the telescopic clamp spring. The pressing table is positioned at the upper end of the pin body guide shaft to control the axial movement position of the pin body.
The top of the pin body limiting block is provided with a C-shaped opening matched with the compression screw, the middle of the pin body limiting block is provided with a clamp spring telescopic groove, the limiting block compression table is arranged below the clamp spring telescopic groove, and the bottom of the pin body limiting block is provided with a guide bushing matched with the threaded pin. The clamp spring telescopic slot is formed by a pair of arc-shaped connecting platforms and a pin body limiting block inner hole which are symmetrically distributed below the C-shaped opening. The inner side arcs of the arc-shaped connecting table are concentric and equal in diameter with the inner hole of the pin body limiting block, and the total length of the two sections of inner side arcs is shorter than the perimeter of the inner hole of the pin body limiting block. After the pin body limiting block is machined, the pin body limiting block is soaked in liquid nitrogen for cryogenic treatment for 2 hours, then taken out of the liquid nitrogen, returned to the room temperature, tempered at 170 ℃ for 2 hours and then used.
The telescopic clamp spring is of a symmetrical structure and is composed of a broken line segment and an arc line, the part matched with the clamp spring telescopic groove is a parallel straight line segment, and the part matched with the arc-shaped connecting table is a concentric arc-shaped segment.
And a pair of cylindrical pins are fixed on the fixing nut, the cylindrical pins are matched with the positioning holes on the second connecting piece, a pair of through holes are arranged in the direction vertical to the connecting line of the cylindrical pins, and a screw penetrates through the through holes to fasten the fixing nut on the second connecting piece.
The use method of the fixed positioning pin comprises the following steps:
1, pressing a guide bushing of a pin body limiting block into a first connected piece, and screwing in a compression screw until the lower surface of a pin head is pressed on the upper surface of a limiting block compression table;
2, a positioning pin on the fixing nut is inserted into a positioning hole on the second connected piece in a matching way, so that the fixing nut and a guide bushing on the pin body limiting block are ensured to be coaxial with each other;
3, the screw penetrates through the fixing nut and is matched and screwed with the threaded hole on the second connecting piece, so that the fixing nut is kept fixed when the threads are screwed;
4, inserting the threaded pin from the inner hole of the pin body limiting block in a matched manner to complete the installation of the fixed positioning pin;
5 when the fixed positioning pin is used for positioning connection, the threaded pin is pressed downwards, the final diameter of the front guide head and the final diameter of the trapezoidal sliding table are larger than the size of the initial opening of the telescopic clamp spring, and the part of the telescopic clamp spring extending out of the telescopic groove of the clamp spring is extruded successively to be opened until the threaded pin is screwed forwards into the fixing nut, so that the purpose of positioning connection is achieved;
6 when the product is disassembled, the positioning pin is pulled out, the threaded pin is screwed out from the fixing nut and pulled upwards, and the telescopic clamp spring gradually retracts along the trapezoidal sliding table and extends out of the clamp spring telescopic groove again;
and 7, pulling up the threaded pin until the locking clamping groove is clamped on the telescopic clamp spring, so that the purpose that the positioning pin is pulled out and fixed on a product is achieved.
The clamp has the advantages that the clamping groove and the telescopic groove of the clamp spring are formed through the size difference of the space structure, and the insertion, positioning and fixing of the positioning pin on a product after being extracted are realized by the aid of the telescopic property of the clamp spring in a specific shape and the matching of the clamp spring and the clamping groove; by fixing the nut, single-sided installation of the threaded pin is achieved. The aircraft production process equipment positioning connection device is small and exquisite and light in structure, simple in operation method, stable in use performance and universal in positioning connection of aircraft production process equipment needing repeated disassembly and assembly.
The present application is described in further detail below with reference to the accompanying drawings of embodiments.
Drawings
FIG. 1 is an overall view of a fixed locating pin;
FIG. 2 is an exploded view of a stationary locating pin component;
FIG. 3 is a drawing of the fixed locating pin;
FIG. 4 is a diagram showing an operating state of a fixed locating pin;
FIG. 5 is a pin body stop block detail view.
The numbering in the figures illustrates: the novel pin comprises a star-shaped handle 1, a threaded pin 2, a pin body limiting block 3, a telescopic clamp spring 4, a compression screw 5, a fixing nut 6, a front guide head 7, a thread screwing section 8, a trapezoidal sliding table 9, a pin body guide shaft 10, a compression table 11, a locking clamping groove 12, a C-shaped opening 13, a clamp spring telescopic groove 14, a limiting block compression table 15, a guide bushing 16, an arc-shaped connecting table 17, a cylindrical pin 18, a through hole 19, a screw 20, a first connected piece 21 and a second connected piece 22.
Detailed Description
Referring to fig. 1-5, a fixed locating pin, including star handle 1, threaded pin 2, round pin body stopper 3, flexible jump ring 4, housing screw 5, fixation nut 6, star handle 1 is fixed in 2 one ends of threaded pin, the 2 other ends of threaded pin insert the 3 holes of round pin body stopper, round pin body stopper 3 is installed on first by connecting piece 21, compress tightly round pin body stopper 3 through housing screw 5, flexible jump ring 4 suit is in round pin body stopper 3, threaded pin 2 passes the second by connecting piece 22 to through rather than complex fixation nut 6 with two by the connecting piece fastening.
The screw thread round pin 2 is by supreme preceding guide head 7, screw thread screwing section 8, 9 round pin body guiding axles 10 of trapezoidal slip table, the platform 11 that compresses tightly down of including down, and preceding guide head 7 sets up at foremost, is less than the initial opening size of flexible jump ring 4 for circular cone structure and tip diameter, and guide screw thread round pin 2 gets into round pin body stopper 3. The small end of the thread screwing section 8 and the small end of the trapezoidal sliding table 9 are connected with each other to form a locking clamping groove 12 of the telescopic clamp spring 4, and the outer diameter of the locking clamping groove 12 is larger than the initial opening size of the telescopic clamp spring 4. A pressing table 11 is located at the upper end of the pin body guide shaft 10 to control the axial movement position of the pin body.
The top of the pin body limiting block 3 is provided with a C-shaped opening 13 matched with the compression screw 5, the middle part is provided with a clamp spring telescopic groove 14, a limiting block compression table 15 is arranged below the clamp spring telescopic groove 14, and the bottom of the pin body limiting block 3 is provided with a guide bush 16 matched with the threaded pin 2. The clamp spring telescopic groove 14 is formed by a pair of arc-shaped connecting platforms 17 and inner holes of the pin body limiting blocks 3, which are symmetrically distributed below the C-shaped opening 13. The inner side arcs of the arc-shaped connecting platforms 17 are concentric and equal in diameter with the inner hole of the pin body limiting block 3, and the total length of the two sections of inner side arcs is shorter than the perimeter of the inner hole of the pin body limiting block 3.
The telescopic clamp spring 4 is of a symmetrical structure and is composed of a broken line section and an arc line, the part matched with the clamp spring telescopic groove 14 is a parallel straight line section, and the part matched with the arc connecting platform 17 is a concentric arc section.
A pair of cylindrical pins 18 are fixed on the fixing nut 6, the cylindrical pins 18 are matched with positioning holes on a second connected piece 22, a pair of through holes 19 are arranged in the direction vertical to the connecting line of the cylindrical pins 18, and a screw 20 penetrates through the through holes 19 to fasten the fixing nut 6 on the second connected piece 22.
The use method of the fixed positioning pin comprises the following steps:
1, pressing a guide bush 16 of a pin body limiting block 3 into a first connected piece 21, and screwing a compression screw 5 until the lower surface of a pin head is pressed on the upper surface of a limiting block compression table 15;
2, a positioning pin 18 on the fixing nut 6 is inserted into a positioning hole on a second connected piece 22 in a matching way, so that the fixing nut 6 and a guide bush 16 on the pin body limiting block 3 are ensured to be coaxial with each other;
3, the screw 20 is screwed through the fixed nut 6 and the threaded hole on the second connected piece 22, so that the fixed nut 6 is kept fixed when the threads are screwed;
4, inserting the threaded pin 2 from the inner hole of the pin body limiting block 3 in a matched manner to complete the installation of the fixed positioning pin;
5 when the fixed positioning pin is used for positioning connection, the threaded pin 2 is pressed downwards, the final diameter of the front guide head 7 and the final diameter of the trapezoidal sliding table 9 are larger than the size of an initial opening of the telescopic clamp spring 4, and the part, extending out of the clamp spring telescopic groove 14, of the telescopic clamp spring 4 is extruded successively to be opened until the threaded pin 2 moves forwards and is screwed into the fixing nut 6, so that the purpose of positioning connection is achieved;
6 when the product is disassembled, the positioning pin is pulled out, the threaded pin 2 is screwed out from the fixing nut 6 and pulled upwards, and the telescopic clamp spring 4 gradually retracts along the trapezoidal sliding table 9 and extends out of the clamp spring telescopic groove 14 again;
7, the threaded pin 2 is pulled upwards until the locking clamping groove 12 is clamped on the telescopic clamp spring 4, so that the purpose that the positioning pin is pulled out and fixed on a product is achieved.
Claims (11)
1. The utility model provides a fixed locating pin, its characterized in that includes the star handle, the thread round pin, round pin body stopper, flexible jump ring, housing screw, fixation nut, the star handle is fixed in thread round pin one end, the thread round pin other end inserts round pin body stopper hole, round pin body stopper is installed on first by the connecting piece, compress tightly round pin body stopper through housing screw, flexible jump ring suit is in round pin body stopper, the thread round pin passes the second by the connecting piece to through rather than complex fixation nut with two by the connecting piece fastening.
2. The fixed positioning pin according to claim 1, wherein the threaded pin comprises a front guide head, a threaded screwing section, a trapezoidal sliding table, a pin body guide shaft and a pressing table from bottom to top, the front guide head is arranged at the foremost end and guides the threaded pin to enter the pin body limiting block, the threaded screwing section is connected with the small end of the trapezoidal sliding table to form a locking clamping groove of the telescopic clamp spring, and the pressing table is positioned at the upper end of the pin body guide shaft to control the axial movement position of the pin body.
3. A fixed locating pin according to claim 2 wherein the front pilot head is of frusto-conical configuration and the minor diameter is less than the initial opening size of the retractable circlip.
4. A fixed locating pin according to claim 2, wherein the outer diameter of the locking bayonet slot is greater than the size of the initial opening of the retractable snap spring.
5. The fixed positioning pin according to claim 1, wherein a C-shaped opening matched with the compression screw is formed in the top of the pin body limiting block, a clamp spring telescopic groove is formed in the middle of the pin body limiting block, a limiting block compression table is arranged below the clamp spring telescopic groove, and a guide bushing matched with the threaded pin is arranged at the bottom of the pin body limiting block.
6. A fixed locating pin according to claim 5, wherein said circlip slot is formed by a pair of arcuate abutment and pin body stop block apertures symmetrically disposed below the "C" shaped opening.
7. The fixed locating pin according to claim 6, wherein the pair of inner arcs of the arc connecting platforms are concentric with the inner hole of the pin body limiting block and have the same diameter, and the total length of the two inner arcs is shorter than the perimeter of the inner hole of the pin body limiting block.
8. The fixed locating pin according to claim 5, wherein the pin body stopper is processed, immersed in liquid nitrogen for cryogenic treatment for 2 hours, taken out of the liquid nitrogen, returned to room temperature, tempered at 170 ℃ for 2 hours, and brought to a use state.
9. The fixed locating pin according to claim 1, wherein the retractable snap spring is of a symmetrical structure and is composed of a broken line segment and an arc line, the part matched with the retractable snap spring groove is a parallel straight line segment, and the part matched with the arc connecting platform is a concentric arc segment.
10. A fixed locating pin according to claim 1 wherein the fixing nut has a pair of pins which engage with locating holes in the second member to be connected and a pair of through holes are provided in the fixing nut perpendicular to the line joining the pins, the screw passing through the through holes to fasten the fixing nut to the second member to be connected.
11. A method for using a fixed positioning pin is characterized by comprising the following steps:
11-1, pressing a guide bushing of a pin body limiting block into a first connected piece, and screwing in a compression screw until the lower surface of a pin head is pressed on the upper surface of a limiting block compression table;
11-2, a positioning pin on the fixing nut is inserted into a positioning hole on the second connected piece in a matching way, so that the fixing nut and a guide bushing on the pin body limiting block are ensured to be coaxial with each other;
11-3, the screw penetrates through the fixing nut and is matched and screwed with the threaded hole on the second connected piece, so that the fixing nut is kept fixed when the threads are screwed;
11-4, inserting the threaded pin from the inner hole of the pin body limiting block in a matched manner to complete the installation of the fixed positioning pin;
11-5, when the fixed positioning pin is used for positioning connection, the threaded pin is pressed downwards, the final diameter of the front guide head and the final diameter of the trapezoidal sliding table are larger than the size of the initial opening of the telescopic clamp spring, and the part of the telescopic clamp spring extending out of the telescopic groove of the clamp spring is extruded successively to be opened until the threaded pin is screwed forwards into the fixing nut, so that the purpose of positioning connection is achieved;
11-6, when the product is disassembled, the positioning pin is pulled out, the threaded pin is screwed out from the fixing nut and pulled upwards, and the telescopic clamp spring gradually retracts along the trapezoidal sliding table and extends out of the clamp spring telescopic groove again;
11-7, the threaded pin is pulled upwards until the locking clamping groove is clamped on the telescopic clamp spring, so that the purpose that the positioning pin is pulled out and fixed on a product is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714958.XA CN110645248A (en) | 2019-08-02 | 2019-08-02 | Fixed positioning pin and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714958.XA CN110645248A (en) | 2019-08-02 | 2019-08-02 | Fixed positioning pin and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110645248A true CN110645248A (en) | 2020-01-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910714958.XA Pending CN110645248A (en) | 2019-08-02 | 2019-08-02 | Fixed positioning pin and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110645248A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201159225Y (en) * | 2007-12-29 | 2008-12-03 | 成都飞机工业（集团）有限责任公司 | Screw-in type self-locking position pin |
| CN201371429Y (en) * | 2009-03-30 | 2009-12-30 | 成都飞机工业（集团）有限责任公司 | Integrated hole pressed positioning pin component |
| CN201953773U (en) * | 2011-03-29 | 2011-08-31 | 浙江鼎力机械有限公司 | Plug pin |
| US8328458B2 (en) * | 2007-07-20 | 2012-12-11 | Twin Bay Medical, Inc. | Sanitary clamp |
| CN203926281U (en) * | 2014-05-26 | 2014-11-05 | 广西玉柴机器股份有限公司 | A kind of integrated positioning pin-and-hole structure |
| CN206439258U (en) * | 2017-01-24 | 2017-08-25 | 青岛钜源运动器材有限公司 | A kind of lockable body-building apparatus drawing knob |
| CN108127148A (en) * | 2017-12-22 | 2018-06-08 | 中航沈飞民用飞机有限责任公司 | Detachable drill jig and its method for drilling composite material location hole |
| CN109202783A (en) * | 2017-07-07 | 2019-01-15 | 中国商用飞机有限责任公司 | A kind of unidirectional positioning clamping pin for confined space |
| CN208608922U (en) * | 2018-08-02 | 2019-03-15 | 澄城县力科钢构有限公司 | A kind of solar bracket ground plug pin |
| CN109605258A (en) * | 2019-01-16 | 2019-04-12 | 沈阳飞机工业（集团）有限公司 | The floating type screw-in clamping and positioning device of one kind and its application method |
-
2019
- 2019-08-02 CN CN201910714958.XA patent/CN110645248A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8328458B2 (en) * | 2007-07-20 | 2012-12-11 | Twin Bay Medical, Inc. | Sanitary clamp |
| CN201159225Y (en) * | 2007-12-29 | 2008-12-03 | 成都飞机工业（集团）有限责任公司 | Screw-in type self-locking position pin |
| CN201371429Y (en) * | 2009-03-30 | 2009-12-30 | 成都飞机工业（集团）有限责任公司 | Integrated hole pressed positioning pin component |
| CN201953773U (en) * | 2011-03-29 | 2011-08-31 | 浙江鼎力机械有限公司 | Plug pin |
| CN203926281U (en) * | 2014-05-26 | 2014-11-05 | 广西玉柴机器股份有限公司 | A kind of integrated positioning pin-and-hole structure |
| CN206439258U (en) * | 2017-01-24 | 2017-08-25 | 青岛钜源运动器材有限公司 | A kind of lockable body-building apparatus drawing knob |
| CN109202783A (en) * | 2017-07-07 | 2019-01-15 | 中国商用飞机有限责任公司 | A kind of unidirectional positioning clamping pin for confined space |
| CN108127148A (en) * | 2017-12-22 | 2018-06-08 | 中航沈飞民用飞机有限责任公司 | Detachable drill jig and its method for drilling composite material location hole |
| CN208608922U (en) * | 2018-08-02 | 2019-03-15 | 澄城县力科钢构有限公司 | A kind of solar bracket ground plug pin |
| CN109605258A (en) * | 2019-01-16 | 2019-04-12 | 沈阳飞机工业（集团）有限公司 | The floating type screw-in clamping and positioning device of one kind and its application method |
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| Title |
|---|
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Application publication date: 20200103 |