CN110814384B - Positioning and drilling device for hinge shaft - Google Patents
Positioning and drilling device for hinge shaft Download PDFInfo
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- CN110814384B CN110814384B CN201911161523.3A CN201911161523A CN110814384B CN 110814384 B CN110814384 B CN 110814384B CN 201911161523 A CN201911161523 A CN 201911161523A CN 110814384 B CN110814384 B CN 110814384B
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- hinge shaft
- drilling
- positioning
- threaded rod
- hinge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/102—Jaws, accessories or adjustment means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
- B23B39/16—Drilling machines with a plurality of working-spindles; Drilling automatons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention relates to a positioning and drilling device of a hinge shaft, which comprises a base, a drilling mechanism arranged on the base and an installation mechanism used for installing the hinge shaft, wherein the installation mechanism comprises an installation seat arranged on the base and a three-jaw chuck arranged on the installation seat; the support frame is provided with a support rod corresponding to the two support shafts of the hinge shaft, and one end of the support rod is abutted to the outer wall of the corresponding support shaft. The invention has the effects of ensuring the positioning stability of the hinge shaft and improving the drilling precision.
Description
Technical Field
The invention relates to the technical field of machining of oil cylinder hinge shafts, in particular to a positioning and drilling device for a hinge shaft.
Background
Currently, hydraulic cylinders are linear actuators whose output force is proportional to the effective area of the piston and the pressure difference across it. The hydraulic cylinder generally comprises a cylinder barrel, a cylinder cover, a piston rod, a sealing device, a buffering device and an exhaust device, and the piston rod is driven to drive the piston to complete linear reciprocating motion; in the use of pneumatic cylinder, a lot of applicable environment need the pneumatic cylinder can take place certain angle slope, so generally can be provided with the hinge at the cylinder outer wall, utilizes the hinge to realize that the pneumatic cylinder links to each other with the external feature, realizes the change of pneumatic cylinder inclination.
The prior Chinese patent with the publication number of CN201979129U discloses a device suitable for processing a hinge shaft hole of a cylinder barrel assembly on a common boring machine, which comprises a base and a rotating plate arranged at the upper end of the base, wherein the center of the base is provided with a mandrel, and the rotating plate is in clearance fit with the mandrel so that the rotating plate can rotate relative to the base; meanwhile, the mandrel is coaxially provided with a replaceable mandrel sleeve on the rotating plate, and the rotating plate is also provided with a positioning pin which is inserted into the base and is used for positioning the rotating angle of the rotating plate; utilize cylinder subassembly lower extreme to cup joint on the interchangeable core cover, and then utilize the clamp plate that boring machine self possessed to carry out the pressfitting to cylinder subassembly upper end, the boring machine begins work, and the boring cutter carries out drilling work to cylinder subassembly one side, has bored the back, orders about the commentaries on classics board and rotates 180, and the boring cutter carries out drilling work to the opposite side.
The above prior art solutions have the following drawbacks: the positioning work of the cylinder barrel assembly is realized by mainly utilizing the inserting fit relation between the replaceable core sleeve and the cylinder barrel assembly and the pressing of the pressing plate on the cylinder barrel assembly, so that the subsequent drilling work is facilitated; but at this in-process, interchangeable core cover needs to be pegged graft with the cylinder subassembly and is cooperated, and for making things convenient for the grafting work of cylinder subassembly in the reality, generally can set up the external diameter of interchangeable core cover and slightly be less than the internal diameter of cylinder subassembly, makes it though can carry on spacingly to the cylinder subassembly, nevertheless in drilling process, receives the butt power of drilling, can lead to the cylinder subassembly to take place certain displacement, influences the accuracy of drilling.
Disclosure of Invention
The invention aims to provide a positioning and drilling device for a hinge shaft, which has the effects of ensuring the positioning stability of the hinge shaft and improving the drilling precision.
The above object of the present invention is achieved by the following technical solutions:
a positioning and drilling device for a hinge shaft comprises a base, a drilling mechanism arranged on the base and an installation mechanism used for installing the hinge shaft, wherein the installation mechanism comprises an installation seat arranged on the base and a three-jaw chuck arranged on the installation seat; the support frame is provided with a support rod corresponding to the two support shafts of the hinge shaft, and one end of the support rod is abutted to the outer wall of the corresponding support shaft.
By adopting the technical scheme, the three jaws can perform synchronous radial displacement by utilizing the self performance of the three-jaw chuck, so that the three jaws can be placed on the three-jaw chuck after a hinge shaft to be processed is placed on the three-jaw chuck, the displacement of the three jaws is adjusted, the three jaws are tightly abutted against the inner wall of the hinge shaft, and the limit work of the hinge shaft is realized; meanwhile, the air cylinder works to drive the pressing plate to move downwards, the pressing plate is tightly propped against the upper end of the hinge shaft, the displacement work of the vertical plane and the horizontal plane of the hinge shaft is realized, the propping rod is propped against the two fulcrum shafts of the hinge shaft to limit the circumferential rotation work of the hinge shaft, the hinge shaft is stably limited on the mounting seat, and finally the drilling mechanism works to realize the drilling work of the hinge shaft, so that the hinge shaft is ensured to be difficult to displace in the drilling process, and the effect of improving the drilling precision is achieved;
in the process, as the three jaws of the three-jaw chuck can radially displace, the three-jaw chuck can adapt to positioning work of the hinge shafts with different sizes, and is convenient for processing the hinge shafts with different sizes.
The invention is further configured to: the three-jaw chuck lower extreme is provided with the backup pad, the backup pad lower extreme is provided with two sets of cross-sections and is convex sliding block, correspond on the mount pad and open the groove that slides that supplies sliding block grafting and sharp displacement, still be provided with the driving piece of ordering about sliding block displacement on the mount pad.
Through adopting above-mentioned technical scheme, the backup pad plays supporting role to the three-jaw chuck, utilizes the groove of sliding of seting up on the mount pad to supply the sliding block to peg graft simultaneously, makes it play the guide effect to the backup pad, makes its driving piece only can order about the backup pad and do the linear displacement work, makes it can be according to drilling mechanism's position, adjusts the displacement that is in the hinge on the three-jaw chuck, reaches the effect that improves hinge positioning accuracy.
The invention is further configured to: the driving piece comprises a screw rod which is rotatably connected in the sliding groove and is in threaded fit with the sliding block, and a first motor, one end of which is coaxially fixed with one end of the screw rod.
Through adopting above-mentioned technical scheme, utilize motor one to order about the lead screw and rotate, under the screw-thread fit effort of lead screw and sliding block, realize the displacement work around the backup pad.
The invention is further configured to: the drilling mechanisms are provided with two groups and are respectively positioned on two sides of the mounting seat; the machine base is also provided with an adjusting mechanism for driving the drilling mechanism to move towards one side of the mounting base.
Through adopting above-mentioned technical scheme, because the hinge has two fulcrum shafts, utilize adjustment mechanism to order about two sets of drilling mechanisms towards mount pad one side displacement, make it can carry out drilling work to two fulcrum shafts simultaneously, improve its drilling efficiency.
The invention is further configured to: adjustment mechanism is including the guide bar and the regulation pole that are used for installing drilling mechanism's supporting seat, pass two supporting seats simultaneously respectively, guide bar and regulation pole parallel arrangement, just the both ends of adjusting the pole are rotated and are connected on the supporting seat, the outer wall of adjusting the pole is provided with two sets of screw thread grooves to both sides opposite direction in the middle of following, two the supporting seat respectively with two screw thread groove screw-thread fit, the one end coaxial coupling of adjusting the pole has motor two.
Through adopting above-mentioned technical scheme, the supporting seat plays the support installation effect to drilling mechanism, and under the guide effect of guide bar to two supporting seats simultaneously, the circumferential direction of restriction supporting seat, and then order about the regulation pole and rotate, under the screw-thread fit effect of double-phase anti-thread groove respectively with the supporting seat, realize that two supporting seats are synchronous reverse displacement, make its two sets of drilling mechanisms can carry out synchronous drilling work to the hinge, the hinge atress is more even, makes its drilling more stable.
The invention is further configured to: the adjusting rod comprises a first threaded rod and a second threaded rod which are coaxially arranged and separated, limiting blocks are respectively arranged at the adjacent ends of the first threaded rod and the second threaded rod, and bolts parallel to the first axis of the first threaded rod are inserted into the corresponding limiting blocks.
By adopting the technical scheme, the first threaded rod and the second threaded rod form a complete adjusting rod, so that the first threaded rod and the second threaded rod can independently rotate, when only one side is needed for drilling, the matching relation between the first threaded rod and the second threaded rod can be released, only the first threaded rod rotates, and the corresponding drilling mechanism is driven to drill the hinge shaft; when two sets of drilling mechanisms are needed for drilling, the bolts can penetrate through the limiting blocks on the first threaded rod and the second threaded rod, and the synchronous rotation relation between the first threaded rod and the second threaded rod is achieved.
The invention is further configured to: the frame is internally provided with a sliding groove, the supporting seat is inserted in the sliding groove, and the outer wall of the supporting seat is abutted to the inner wall of the sliding groove.
Through adopting above-mentioned technical scheme, utilize the spout to hold the supporting seat, simultaneously because supporting seat outer wall and spout inner wall butt make its spout can play spacing supporting role to the supporting seat, make its supporting seat displacement more stable, drilling mechanism during operation simultaneously, what cause rocks also can reduce, further improves drilling accuracy.
The invention is further configured to: and a telescopic curtain is connected between the supporting seat and the mounting seat.
Through adopting above-mentioned technical scheme, utilize flexible curtain can expand or contract along with the support seat displacement around, make it play between mount pad and support seat and shelter from the effect, can accomodate the sweeps that drilling produced, prevent that the sweeps from falling into the spout, or drop on adjusting the pole, influence the displacement work of support seat.
The invention is further configured to: the first threaded rod and the second threaded rod are connected to be located below the mounting seat, and the base is correspondingly provided with an open slot.
Through adopting above-mentioned technical scheme, utilize the open slot of seting up on the frame, the staff's hand of being convenient for stretches into the mount pad below, realizes being connected or separating of threaded rod one and threaded rod two.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the clamping jaws of the three-jaw chuck can be used for radial displacement, so that the three-jaw chuck can be suitable for positioning the hinge shafts with different sizes, meanwhile, the hinge shafts can be firmly abutted and limited, further, two abutting rods are used for abutting against fulcrum shafts of the hinge shafts, and the pressing plate is used for abutting against the upper ends of the hinge shafts, so that the displacement of the hinge shafts in the circumferential direction, the vertical plane and the horizontal plane is limited, the stability of the hinge shafts in the drilling process is ensured, and the effect of improving the drilling precision is achieved;
2. utilize motor two to order about the regulation pole and rotate, order about two sets of drilling mechanisms and do synchronous reverse displacement work, simultaneously towards the hinge synchronous displacement as far as, realize improving drilling efficiency on the one hand to the drilling work of two counter shafts of hinge, on the other hand makes its hinge both sides atress balanced, further guarantees the stability of hinge.
Drawings
Fig. 1 is a schematic overall structure diagram of the first embodiment.
Fig. 2 is a partial structural view of the housing of fig. 1.
FIG. 3 is a partial schematic structural view of the mounting mechanism of FIG. 1.
In the figure, 1, a machine base; 2. a drilling mechanism; 3. an installation mechanism; 31. a mounting seat; 32. a three-jaw chuck; 33. a support frame; 34. a cylinder; 35. pressing a plate; 36. a support bar; 37. a butting rod; 4. a hinge shaft; 5. a support plate; 6. a sliding block; 7. a sliding groove; 8. a screw rod; 9. a first motor; 10. a supporting seat; 11. a chute; 12. a guide bar; 13. adjusting a rod; 131. a first threaded rod; 132. a second threaded rod; 14. a second motor; 15. a limiting block; 16. positioning seats; 17. a retractable curtain; 18. an open slot.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: referring to fig. 1 and 3, the positioning and drilling device for the hinge shaft disclosed by the invention comprises a base 1, a drilling mechanism 2 arranged on the base 1, and an installation mechanism 3 for installing a hinge shaft 4; the mounting mechanism 3 is arranged in the middle of the base 1, the mounting mechanism 3 comprises a mounting seat 31, the mounting seat 31 is fixed on the base 1, a three-jaw chuck 32 is arranged on the mounting seat 31, a support frame 33 is vertically fixed at the rear end of the mounting seat 31, which is positioned at the three-jaw chuck 32, the upper end of the support frame 33 extends above the three-jaw chuck 32, an air cylinder 34 is vertically fixed on the support frame 33, the telescopic shaft of the air cylinder 34 is arranged downwards, and a pressing plate 35 is fixed on the telescopic shaft; the drilling mechanisms 2 are provided in two sets, and are respectively located on two sides of the mounting seat 31 in the horizontal direction. After the hinge shaft 4 is placed on the three-jaw chuck 32, the three-jaw chuck 32 works, three jaws tightly abut against the inner wall of the hinge shaft 4, fulcrum shafts of the hinge shaft 4 are respectively arranged towards the two drilling mechanisms 2, the air cylinder 34 drives the pressing plate 35 to tightly abut against the hinge shaft 4, and then the drilling mechanisms 2 work to complete drilling work on the hinge shaft 4. Wherein, the air cylinder 34 is communicated with an external air pump through a pipeline, and the air pump is used for providing power for the air cylinder 34.
The supporting frame 33 is provided with two supporting rods 36 along the horizontal direction, the two supporting rods 36 are respectively sleeved with a butting rod 37, one end of the butting rod 37 is fixed with a frame-shaped sleeve with the cross section being spliced on the supporting rod 36, and the frame-shaped sleeve is in threaded fit with the frame-shaped sleeve through a bolt, and one end of the frame-shaped sleeve is butted with the supporting rod 36, so that the limiting work of the frame-shaped sleeve is realized; the other end of the abutting rod 37 abuts against a fulcrum of the hinge shaft 4 to limit the circumferential rotation of the hinge shaft 4.
The three-jaw chuck 32 is fixed on a supporting plate 5, two sliding blocks 6 with convex cross sections are fixed at the lower end of the supporting plate 5, and the sliding blocks 6 are arranged vertical to the drilling mechanism 2; two sliding grooves 7 for the sliding blocks 6 to be inserted are correspondingly formed in the mounting seat 31, the size of the sliding grooves 7 is equal to that of the cross section of the sliding blocks 6, and the length of the sliding grooves 7 is longer than that of the sliding blocks 6; the support plate 5 is driven to move linearly away from or close to the support bracket 33 by a driving member.
The driving piece comprises a screw rod 8 and a first motor 9, the screw rod 8 is only provided with one screw rod and is arranged parallel to the sliding groove 7, two ends of the screw rod 8 are rotatably connected to the side wall of the sliding groove 7, the screw rod 8 penetrates through the sliding block 6 and is in threaded fit with the sliding block 6, the first motor 9 is fixed on the mounting seat 31, and an output shaft and one end of the screw rod 8 are coaxially fixed and are connected with an external power supply through an electric wire; when the motor is powered on, the first motor 9 drives the screw rod 8 to rotate, and the support plate 5 is driven to linearly displace to work.
Referring to fig. 1 and 2, the base 1 is provided with a chute 11 along a direction perpendicular to the mounting seat 31, two supporting seats 10 are inserted into the chute 11, and three side walls of the supporting seats 10 are abutted to side walls of the chute 11; the two drilling mechanisms 2 are respectively fixed on the corresponding supporting seats 10; telescopic curtains 17 are respectively fixed between the two supporting seats 10 and the mounting seat 31; the machine base 1 is also provided with an adjusting piece for driving the two supporting seats 10 to do linear displacement.
The adjusting piece comprises an adjusting rod 13 and a guide rod 12, wherein the guide rod 12 and the adjusting rod 13 are arranged in parallel with the sliding chute 11 and simultaneously penetrate through the two supporting seats 10; two ends of the guide rod 12 are fixed on the side wall of the sliding chute 11; the adjusting rod 13 comprises a first threaded rod 131 and a second threaded rod 132 which are coaxially fixed, and the thread directions of the thread grooves on the outer walls of the first threaded rod 131 and the second threaded rod 132 are opposite; one sections of the first threaded rod 131 and the second threaded rod 132 below the mounting seat 31 are smooth sections; a second motor 14 is fixed outside the machine base 1, and an output shaft of the second motor 14 is coaxially fixed with one end of the first threaded rod 131, which is opposite to the second threaded rod 132; the second motor 14 is communicated with an external power supply through an electric wire, and when the second motor 14 is electrified, the second motor 14 drives the adjusting rod 13 to rotate, so that synchronous reverse displacement of the two supporting seats 10 is realized, and the two drilling mechanisms 2 can be driven to simultaneously drill the hinge shaft 4.
The implementation principle of the embodiment is as follows: after the hinge shaft 4 is placed on the three-jaw chuck 32, the three-jaw chuck 32 moves to drive the three jaws to abut against the inner wall of the hinge shaft 4, the abutting rods 37 abut against the two support shafts, the air cylinder 34 drives the pressing plate 35 to abut against the upper end of the hinge shaft 4, the motor II 14 is started, the adjusting rod 13 is driven to rotate, the two support seats 10 are driven to drive the two drilling mechanisms 2 to move towards one side of the hinge shaft 4, meanwhile, the drilling mechanisms 2 work to drill the support shafts of the hinge shaft 4, therefore, the drilling work can be completed quickly, and the production efficiency is improved.
Example 2: the difference from embodiment 1 is that, referring to fig. 2, the adjacent ends of the first threaded rod 131 and the second threaded rod 132 are in a separated state, two groups of corresponding limiting blocks 15 are respectively arranged on the outer walls of the adjacent ends of the first threaded rod 131 and the second threaded rod 132, and the two groups of limiting blocks 15 are uniformly arranged along the circumferential direction of the first threaded rod 131/the second threaded rod 132; the two groups of limiting blocks 15 are provided with corresponding through holes, the same bolt is inserted into the through holes of the limiting blocks 15 in the same group, and one end of the bolt is in threaded fit with the nut, so that the first threaded rod 131 and the second threaded rod 132 are coaxially connected or separated.
In this embodiment, the chute 11 is further fixed with two positioning seats 16 below the mounting seat 31, one end of the first threaded rod 131 and one end of the second threaded rod 132 are rotatably connected with the corresponding positioning seats 16 through bearings, respectively, and the limiting block 15 is located between the two positioning seats 16. Meanwhile, the side wall of the front end of the machine base 1 is provided with an open slot 18 communicated with the sliding groove 11, and a worker can operate the bolt through the open slot 18.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides a location drilling equipment of hinge, includes frame (1), sets up drilling mechanism (2) on frame (1) and is used for installation mechanism (3) of installation hinge (4), its characterized in that: the mounting mechanism (3) comprises a mounting seat (31) arranged on the base (1) and a three-jaw chuck (32) arranged on the mounting seat (31), a supporting frame (33) is further arranged on the mounting seat (31), an air cylinder (34) is vertically arranged on the supporting frame (33), a telescopic shaft of the air cylinder (34) faces downwards, a pressing plate (35) is arranged on the telescopic shaft, and the pressing plate (35) abuts against the upper end of the hinge shaft (4) in the vertical displacement process; still correspond two pivots of hinge (4) on support frame (33) and be provided with to connect pole (37), the one end of connecting pole (37) is followed from the longitudinal direction and is corresponded the counter shaft outer wall butt with hinge (4), three-jaw chuck (32) are followed frame (1) longitudinal sliding connects be in on mount pad (31).
2. The positioning and drilling device of a hinge shaft according to claim 1, wherein: three-jaw chuck (32) lower extreme is provided with backup pad (5), backup pad (5) lower extreme is provided with two sets of cross-sections and is convex sliding block (6), correspond on mount pad (31) and open the groove (7) that slides that supply sliding block (6) to peg graft and sharp displacement, still be provided with the driving piece of ordering about sliding block (6) displacement on mount pad (31).
3. The positioning and drilling device of a hinge shaft according to claim 2, wherein: the driving piece comprises a screw rod (8) which is rotatably connected in the sliding groove (7) and is in threaded fit with the sliding block (6), and a first motor (9) with one end coaxially fixed with one end of the screw rod (8).
4. The positioning and drilling device of a hinge shaft according to claim 1, wherein: the drilling mechanisms (2) are provided with two groups and are respectively positioned on two sides of the mounting seat (31); the machine base (1) is also provided with an adjusting mechanism for driving the drilling mechanism (2) to move towards one side of the mounting base (31).
5. The positioning and drilling device of a hinge shaft according to claim 4, wherein: adjustment mechanism is including being used for installing supporting seat (10) of drilling mechanism (2) respectively, guide bar (12) and regulation pole (13) of passing two supporting seat (10) simultaneously, guide bar (12) with adjust pole (13) parallel arrangement, just the both ends of adjusting pole (13) are rotated and are connected on supporting seat (10), the outer wall of adjusting pole (13) is provided with two sets of screw thread grooves to both sides opposite direction from the centre, two supporting seat (10) respectively with two screw thread groove screw-thread fit, the one end coaxial coupling of adjusting pole (13) has motor two (14).
6. The positioning and drilling device of a hinge shaft according to claim 5, wherein: the adjusting rod (13) comprises a first threaded rod (131) and a second threaded rod (132) which are coaxially arranged and separated, limiting blocks (15) are respectively arranged at the adjacent ends of the first threaded rod (131) and the second threaded rod (132), and bolts parallel to the axis of the first threaded rod (131) are inserted into the corresponding limiting blocks (15).
7. The positioning and drilling device for the hinge shaft according to claim 5 or 6, wherein: a sliding groove (11) is formed in the base (1), the supporting seat (10) is inserted into the sliding groove (11), and the outer wall of the supporting seat is abutted to the inner wall of the sliding groove (11).
8. The positioning and drilling device for the hinge shaft according to claim 5 or 6, wherein: and a telescopic curtain (17) is connected between the supporting seat (10) and the mounting seat (31).
9. The positioning and drilling device of a hinge shaft according to claim 6, wherein: the connecting ends of the first threaded rod (131) and the second threaded rod (132) are located below the mounting seat (31), and the base (1) is correspondingly provided with an open slot (18).
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CN201911161523.3A CN110814384B (en) | 2019-11-25 | 2019-11-25 | Positioning and drilling device for hinge shaft |
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CN201911161523.3A CN110814384B (en) | 2019-11-25 | 2019-11-25 | Positioning and drilling device for hinge shaft |
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CN110814384B true CN110814384B (en) | 2020-11-20 |
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Address after: Puji Jie Dao Xiao Yuan Cun, Zhangqiu District, Jinan City, Shandong Province Applicant after: Shandong Jianqiao Machinery Co., Ltd Address before: 250200 Xiaoyuan village, Puji sub district office, Zhangqiu District, Jinan City, Shandong Province Applicant before: Ji'nan Jianqiao Machinery Co.,Ltd. |
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