CN2788941Y - Optical coordinate bench drill - Google Patents
Optical coordinate bench drill Download PDFInfo
- Publication number
- CN2788941Y CN2788941Y CN 200520083058 CN200520083058U CN2788941Y CN 2788941 Y CN2788941 Y CN 2788941Y CN 200520083058 CN200520083058 CN 200520083058 CN 200520083058 U CN200520083058 U CN 200520083058U CN 2788941 Y CN2788941 Y CN 2788941Y
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- light beam
- planar light
- beam transmitter
- transmitter
- main shaft
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- 230000003287 optical effect Effects 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model relates to an optical coordinate bench drill. A lower supporting seat is fixed on an upright post, and a plane light beam transmitter is fixed on the supporting seat. The transmitter is positioned at the middle of the front of the upright post onwards or is arranged by sloping towards the front lower part, and a machine head box or one side of a sleeve barrel is fixed with an upper supporting seat. The other plane light beam transmitter is fixed on the upper supporting seat, and the transmitter is positioned at the middle of the lateral surface of a main shaft downwards or is arranged by sloping downwards and inwards. The plane light beams which are emitted by the two transmitters are respectively coincident to front and back and right and left central planes of the main shaft, and the projections of two plane light beams form an X-Y rectangular coordinate system and a central point O thereof. One to four plane light beam transmitters, the light beam direction of which is the same as the transmitters and left and right positions of which can be adjusted according to graduations can also be arranged in upper and lower supporting seats leftwards and rightwards. The plane light beams are projected on a work bench to form a square rectangular coordinate. According to the rectangular coordinate system, the position of a workpiece and hole position can be conveniently and quickly adjusted, the workpiece can be quickly pushed to the next hole position from the previous hole position and the utility model is flexible and convenient and has high efficiency.
Description
Technical field
The utility model belongs to the drilling machine technical field, relates in particular to have optical coordinate to adjust the position of workpiece on workbench and the design of the drilling machine of bench drill, upright drill, radial drilling machine, drilling and milling machine and other type of position, hole more easily.
Background technology
Up to now, the various drilling machines of existing bench drill, upright drill, radial drilling machine, drilling and milling machine and other type all do not have the coordinate of being convenient to workpiece location, processing.During boring, will be undertaken by line, number hole, test drilling, four operations of boring (work step) usually, test drilling wherein also may be carried out repeatedly, and is quite loaded down with trivial details.During travelling workpiece, can only carry out by rule of thumb on workbench, no coordinate can reference.Even it also is like this will processing a row or one group of hole on workpiece.Can use the drill jig location except that producing in enormous quantities, still need during small lot batch manufacture to be undertaken by above-mentioned four operations one by one.Not only bother, production efficiency is also low.
Publication number discloses a kind of drilling machine that intersects the planar light beams location with two of two generating lasers emissions for the spy opens the Japan Patent that 2000-343309, name be called " Working position indication device ".Its advantage is that location, position, hole is convenient, accurate.But, its two planar light beam on workbench be projected as angle random two intersect straight lines, except that intersection point, projection straight line itself there is no any with reference to positioning action, more can not be on workbench the form right angle coordinate system.In addition, two generating lasers all need be fixedly mounted on the holder that is fixed on the drilling machine column or be fixed on the hinged contiguous block of this holder on, its position easily move to change, and need adjust repeatedly, fixing, time-consuming.
Summary of the invention
The purpose of this utility model just is to overcome above-mentioned shortcoming and defect, and a kind of new design of optical coordinae type bench drill is provided.It not only can know the projection that indicates drill press spindle that is center line of bit on workbench, and can form the rectangular coordinate system clear, complete, attractive in appearance that comprises X-axis, Y-axis on workbench.Can quantitatively adjust the position of workpiece on workbench according to rectangular co-ordinate, very convenient, fast.Not only can determine the position, hole quickly and accurately, the not number of need hole, test drilling, and can be that position, second hole is adjusted, inferred to benchmark rapidly and accurately with first hole, and can the rest may be inferred, be particularly useful for the small lot batch manufacture of workpiece, enhance productivity greatly.And its rectangular co-ordinate fasten also can have some X to, Y to auxiliary parallel lines, the position of these parallel lines can be pressed the scale flexible modulation as required.In addition, the rich color of the X-axis of rectangular coordinate system, Y-axis and other auxiliary parallel lines can be selected voluntarily by manufacturer or user.
Bench drill comprises base, be fixed on upright on the base leans on, is installed in the upright workbench of leaning on and head box, is fixed on motor on the head box, is installed in transmission mechanism, the main shaft that is connected with transmission mechanism and drill chuck thereof on the axle of motor and drill bit, is contained in sleeve outside the main shaft, is engaged on the feed mechanism on the tooth bar of sleeve and is installed in parts such as electric control system on the head box with bearing holder (housing, cover).
In order to achieve the above object, upright the leaning on of the utility model fixed undersetting, fixing the planar light beam transmitter on the undersetting.The planar light beam transmitter is positioned at upright centre position of leaning on the front and tilts to install forward or to the front lower place, and the planar light beam that it sends overlaps with the front and back central plane of main shaft.One side of head box or sleeve is being fixed upper bracket, is fixing another planar light beam transmitter on the upper bracket.The centre position that this planar light beam transmitter is positioned at the main shaft side installation that slopes inwardly downwards or downwards, the planar light beam that it sends overlaps with the left and right sides central plane of main shaft.Two planar light beam transmitters all are connected with electric control system with lead.Effect was best when upper bracket was fixed on the head box.As be fixed on the sleeve, can make sleeve long or reduce effective working height of drilling machine.Also can save upper bracket, undersetting, the planar light beam transmitter directly is fixed on head box, upright leaning on.But always need fixing, connector between planar light beam transmitter and head box, upright the leaning on, so it is alternative to be still being equal to of upper bracket, undersetting in fact.
The planar light beam that above-mentioned two planar light beam transmitters are sent overlaps with the front and back and the left and right sides central plane of main shaft respectively, and is therefore inevitable orthogonal, and its intersection is also with regard to central lines inevitable and main shaft that is drill bit.So, their projections on the workbench vertical with column promptly constitute the X-Y rectangular coordinate system: the initial point that is the central point O of the projection form right angle coordinate system of intersection, the Y-axis of the planar light beam form right angle coordinate system that overlaps with the front and back central plane of main shaft, the X-axis of the planar light beam form right angle coordinate system that overlaps with the left and right sides central plane of main shaft.Its center O point has determined to desire the position, hole of machining hole exactly.During boring, only need intersection, can process errorless two planar light beams of hole bit alignment of work piece.
The light source of planar light beam transmitter is one of laser diode or light emitting diode.The luminous intensity height of laser diode, very bright.Light emitting diode can be a kind of in rubescent look, white, blueness, yellow, green, purple or the bi-coloured light.Rich color is one of advantage of light emitting diode, can select as required to install, and is very eye-catching, attractive in appearance.For example, the light emitting diode that forms X, Y-axis is red, forms the white that is of all the other (following) auxiliary parallel lines; The light emitting diode that perhaps forms X, Y-axis is for blue, form all the other auxiliary parallel lines for sending the dichromatic LED of redness, white, according to the needs of processing, send redness sometimes, send white or the like sometimes by electric control system control.Laser diode and light emitting diode all have the advantage of low price, long service life.
Except that above-mentioned planar light beam transmitter was installed, its both sides also were installed with the same number of 1～4 planar light beam transmitter respectively again on upper bracket and the undersetting.The planar light beam that 1～4 planar light beam transmitter of both sides is installed on the adjuster that can regulate its position, left and right sides and they send is parallel with the planar light beam that planar light beam transmitter in the middle of being positioned at accordingly sends.Wherein 1～4 of both sides planar light beam transmitter is installed forward or is tilted to install to the front lower place in the undersetting, and 1～4 of both sides planar light beam transmitter is installed downwards or the installation that slopes inwardly downwards in the upper bracket.
The projection of planar light beam on the workbench vertical with column that 1～4 planar light beam transmitter of described both sides sends promptly constitutes some auxiliary parallel lines of X-Y rectangular coordinate system.If all planar light beam transmitters all are adjusted into equidistantly, its projection is the auxiliary graticule line of form right angle coordinate system, has the location with reference to being worth.Can be used for quantitatively adjusting position and the hole position of workpiece on workbench.The planar light beam transmitter of both sides is installed downwards or is sloped inwardly downwards to install and has same effect in the upper bracket, all constitutes the boost line parallel with X-axis.The planar light beam transmitter of both sides then preferably tilts to install to the front lower place in the undersetting, can avoid light to inject in operator's the eye and damage.But no matter install forward or tilt to install, all can constitute the boost line parallel with Y-axis to the front lower place.
In the middle of two bearings all have up and down short groove and about two elongated slots, fixing a planar light beam transmitter in the middle short groove.Adjuster is made of screw rod and the knob and the circlip for shaft that are installed in its two ends.About 1～4 screw rod respectively is installed in two elongated slots, the outer end of screw rod protrudes in the lateral surface of bearing, is fixing knob on it, give prominence in the short groove in centre the inner of screw rod, and circlip for shaft is installed on it.The 1st planar light beam transmitter top of both sides has so as to being installed in the 1st screw on the screw rod and the corresponding unthreaded hole that passes all the other screw rods, the middle part has so as to being installed in the 2nd screw on the screw rod and the corresponding unthreaded hole that passes all the other screw rods on the 2nd the planar light beam transmitter, and the rest may be inferred.Except that the centre, the front of all the other planar light beam transmitters upper end all has graticule, and bearing top then has the rule corresponding with it.Rule can be by the mm scale.
The optical coordinae type bench drill of this structure, two bearings all are equipped with 3～9 planar light beam transmitters about it.Effect was best when generally speaking, two bearings were respectively installed 1～5 planar light beam transmitter up and down.
Press the knob of rule rotation respective planes light-beam transmitter, under the drive of rotary screw, just can regulate this planar light beam transmitter position, the left and right sides in the undersetting on corresponding.When a plurality of planar light beam transmitters are adjusted to when equidistant, each grid in the X-Y rectangular coordinate system is square.Respectively press scale and regulate a planar light beam transmitter of going up in the undersetting, the intersection of the projection of auxiliary plane light beam on the workbench vertical with column that it sent promptly can be used for the location of position, new hole.Can adjust, infer position, second hole rapidly and accurately by first position, hole (it is overlapped with center O point) in view of the above, and can the rest may be inferred, be particularly useful for the small lot batch manufacture of workpiece.
The planar light beam transmitter can be the form of a stroke or a combination of strokes.The planar light beam transmitter volume of the form of a stroke or a combination of strokes is little, be convenient to install.And the laser pen that can directly use children to play, the low price cost is low.
The utility model not only can be known the projection that indicates drill press spindle that is center line of bit on workbench, and can form the rectangular coordinate system clear, complete, attractive in appearance that comprises X-axis, Y-axis on workbench.Can quantitatively adjust the position of workpiece on workbench according to rectangular co-ordinate, very convenient, fast.Not only can determine the position, hole quickly and accurately, the not number of need hole, test drilling, and can be that position, second hole is adjusted, inferred to benchmark rapidly and accurately with first hole, and can the rest may be inferred, be particularly useful for the small lot batch manufacture of workpiece, enhance productivity greatly.And its rectangular co-ordinate fasten also can have some X to, Y to auxiliary parallel lines, the position of these parallel lines can be pressed the scale flexible modulation as required.In addition, the rich color of the X-axis of rectangular coordinate system, Y-axis and other auxiliary parallel lines can be selected voluntarily by manufacturer or user.But its wide popularization and application is in boring processing, and its structure and principle are equally applicable to the various drilling machines of upright drill, radial drilling machine, drilling and milling machine and other type.
Description of drawings
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the front view of the last undersetting of embodiment 2.
Fig. 3 is the A-A profile of the undersetting of embodiment 2.
Fig. 4 is the A-A profile of the upper bracket of embodiment 2.
Fig. 5 is the perspective view of embodiment 2 on the workbench vertical with column.
Fig. 6 is the perspective view of embodiment 3 on the workbench vertical with column.
The specific embodiment
Embodiment 1.A kind of optical coordinae type bench drill, as shown in Figure 1.It comprises base 1, upright lean on 2, workbench 3, head box 4, motor 5, transmission mechanism, main shaft and drill chuck thereof and drill bit 6, with bearing holder (housing, cover) be contained in the main shaft outside sleeve, be engaged on feed mechanism 7 and electric control system on the tooth bar of sleeve.Upright leaning on fixed undersetting 8 on 2, fixing planar light beam transmitter 9 on the undersetting 8.This planar light beam transmitter 9 is positioned at upright centre position of leaning on 2 fronts and tilts to install to the front lower place, and the planar light beam 10 that it sends overlaps with the front and back central plane of main shaft 6, and it is projected as Y-axis on workbench 3.One side of head box 4 is being fixed upper bracket 11, is fixing another planar light beam transmitter 12 on the upper bracket 11.Install downwards in the centre position that this planar light beam transmitter 12 is positioned at the main shaft side, and the planar light beam 13 that it sends overlaps with the left and right sides central plane of main shaft, and it is projected as X-axis on workbench 3.Two planar light beam transmitters 9 all are connected with electric control system with lead with 12, and the projection of the planar light beam that they are sent out on the workbench vertical with column promptly constitutes the X-Y rectangular coordinate system, and the projection of intersection is the initial point O of rectangular coordinate system.Planar light beam transmitter 9 and 12 is the form of a stroke or a combination of strokes, and its light source is a red laser diode.
Embodiment 1 can determine position, hole, the not number of need hole, test drilling quickly and accurately.It forms complete X-Y axle rectangular co-ordinate projection on workbench.The operator can adjust angle and the position of workpiece on workbench according to this rectangular co-ordinate, and is convenient, fast.
Embodiment 2.A kind of optical coordinae type bench drill is as Fig. 2～shown in Figure 4.Except that above-mentioned planar light beam transmitter 12 and 9 were installed respectively, its both sides also respectively were installed with 2 planar light beam transmitters respectively again on its upper bracket 15 and the undersetting 14.The planar light beam that 2 planar light beam transmitters of both sides are installed on the adjuster that can regulate its position, left and right sides and they send is parallel with the planar light beam that planar light beam transmitter in the middle of being positioned at accordingly sends.Wherein 2 of both sides (totally 4) planar light beam transmitters 23,27,22 and 24 tilt to install to the front lower place in the undersetting 14.2 of both sides (totally 4) planar light beam transmitters 23,27,22 and 24 installation that slopes inwardly downwards in the upper bracket 15.
In the middle of two bearings 15 and 14 all have up and down short groove 16 and about two elongated slots 17.Fixing a planar light beam transmitter 9 or 12 in the middle short groove 16.Adjuster by screw rod 18 or 19 and the knob 20 and the circlip for shaft 21 that are installed in its two ends constitute.About two screw rods 18 and 19 respectively are installed in two elongated slots 17 up and down.Screw rod 18 and 19 outer end protrude in the lateral surface of bearing, and each is fixing knob 20 on it.Give prominence in the short groove 16 in centre screw rod 18 and the inner of 19, and circlip for shaft 21 respectively is installed on it.The 1st planar light beam transmitter 27 from top to bottom of both sides and 22 tops have so as to being installed in the 1st screw on the screw rod 18 and passing the corresponding unthreaded hole of all the other screw rods 19, have on the 2nd planar light beam transmitter 23 and 24 so as to being installed in the 2nd screw on the screw rod 19 and passing the corresponding unthreaded hole of all the other screw rods 18.The effect of unthreaded hole is to slide along screw rod 19, is used for guiding.And the rest may be inferred.All the other planar light beam transmitters 23,27,22 and 24 front upper end all has graticule 25, the top rule corresponding with it 26 that then have of bearing except that the centre.
The planar light beam transmitter is the form of a stroke or a combination of strokes, and its light source is a light emitting diode.The color of light emitting diode is a white and red.Wherein two mid-plane light- beam transmitters 9 and 12 light emitting diode are red, and all the other be white.The rectangular co-ordinate projection that they form is very eye-catching, attractive in appearance.
Shown in Figure 5, the spacing of two bearings 15 up and down of embodiment 2 and each 5 planar light beam transmitter of 14 all is adjusted to 50mm, its grid X-Y axle rectangular coordinate system that is projected as spacing 50mm on the workbench vertical with column, and initial point is O.
Embodiment 3.A kind of optical coordinae type bench drill.It is that each omits a planar light beam transmitter 23 and 24 symmetrically in two bearings up and down of embodiment 2, only surplus planar light beam transmitter 27 and 22, but still keep screw rod 19.Planar light beam transmitter 27 and 22 tops have so as to being installed in the 1st screw on the screw rod 18 and the corresponding unthreaded hole that passes all the other screw rods 19.19 of screw rods play the guiding role, and unthreaded hole can slide along it.As shown in Figure 6, the rectangular co-ordinate that it is constituted on the workbench vertical with column is projected in X, the Y direction respectively has only three lines, and is simple and practical.Except clearly having indicated central point O, press scale and regulate up and down each planar light beam transmitter 27 and 22 in two bearings, can determine next position, hole very soon by position, last hole.
For example, as determining the position, hole fast and get out the A hole by above-mentioned operation, and know the coordinate figure of B hole with respect to the A hole, if according to this coordinate press scale regulate about planar light beam transmitter 27 and 22 in two bearings, the intersection point that makes them is the coordinate points in B hole; Translation workpiece on workbench makes the A hole be positioned at this coordinate points then, can directly get out the B hole at central point O place.But when the coordinate points that it should be noted that the B hole is arranged in the different quadrant of rectangular coordinate system, should regulate different two planar light beam transmitters 27 and 22 (two planar light beam transmitters 27 and 22 are respectively arranged in upper and lower two bearings) in upper and lower two bearings.
But embodiment 1～3 wide popularization and application is in boring processing.Its structure and principle are equally applicable to the various drilling machines of upright drill, radial drilling machine, drilling and milling machine and other type.
Claims (5)
1. optical coordinae type bench drill, comprise base, upright leaning on, workbench, head box, motor, transmission mechanism, main shaft and drill chuck and drill bit, be contained in the sleeve of main shaft outside with bearing holder (housing, cover), feed mechanism and electric control system, it is characterized in that standing to lean on fixing undersetting, fixing the planar light beam transmitter on the undersetting, the planar light beam transmitter is positioned at upright centre position of leaning on the front and tilts to install forward or to the front lower place, the planar light beam that it sends overlaps with the front and back central plane of main shaft, one side of head box or sleeve is being fixed upper bracket, fixing another planar light beam transmitter on the upper bracket, the centre position that this planar light beam transmitter is positioned at the main shaft side installation that slopes inwardly downwards or downwards, the planar light beam that it sends overlaps with the left and right sides central plane of main shaft, and two planar light beam transmitters all are connected with electric control system with lead.
2. according to the described optical coordinae type bench drill of claim 1, the light source that it is characterized in that said planar light beam transmitter is laser diode or light emitting diode, and wherein light emitting diode is a kind of in rubescent look, white, blueness, yellow, green, purple or the bi-coloured light.
3. according to claim 1 or 2 described optical coordinae type bench drills, it is characterized in that on said upper bracket and the undersetting except that above-mentioned planar light beam transmitter is installed, its both sides also are installed with the same number of 1～4 planar light beam transmitter respectively again, the planar light beam that 1～4 planar light beam transmitter of both sides is installed on the adjuster that can regulate its position, left and right sides and they send is parallel with the planar light beam that planar light beam transmitter in the middle of being positioned at accordingly sends, wherein 1～4 of both sides planar light beam transmitter is installed forward or is tilted to install to the front lower place in the undersetting, and 1～4 of both sides planar light beam transmitter is installed downwards or the installation that slopes inwardly downwards in the upper bracket.
4. according to the described optical coordinae type bench drill of claim 3, it is characterized in that said up and down two bearings all have in the middle of short groove and about two elongated slots, fixing a planar light beam transmitter in the middle short groove, adjuster is made of screw rod and the knob and the circlip for shaft that are installed in its two ends, about 1～4 screw rod respectively is installed in two elongated slots, the outer end of screw rod protrudes in the lateral surface of bearing, fixing knob on it, give prominence in the short groove in centre the inner of screw rod, circlip for shaft is installed on it, the 1st planar light beam transmitter top of both sides has so as to being installed in the 1st screw on the screw rod and the corresponding unthreaded hole that passes all the other screw rods, the middle part has so as to being installed in the 2nd screw on the screw rod and the corresponding unthreaded hole that passes all the other screw rods on the 2nd the planar light beam transmitter, the rest may be inferred, the front of all the other planar light beam transmitters upper end all has graticule except that the centre, and bearing top then has the rule corresponding with it.
5. according to the described optical coordinae type bench drill of claim 4, it is characterized in that said planar light beam transmitter is the form of a stroke or a combination of strokes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520083058 CN2788941Y (en) | 2005-05-12 | 2005-05-12 | Optical coordinate bench drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520083058 CN2788941Y (en) | 2005-05-12 | 2005-05-12 | Optical coordinate bench drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2788941Y true CN2788941Y (en) | 2006-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520083058 Expired - Fee Related CN2788941Y (en) | 2005-05-12 | 2005-05-12 | Optical coordinate bench drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2788941Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209549A (en) * | 2013-05-31 | 2014-12-17 | 浙江欣兴工具有限公司 | Drilling machine with optical positioning device |
| CN104209548A (en) * | 2013-05-31 | 2014-12-17 | 浙江欣兴工具有限公司 | Drilling machine provided with mechanical positioning device |
| CN107378070A (en) * | 2017-07-17 | 2017-11-24 | 大连理工大学 | One kind drilling accurate positioning method |
| CN108856816A (en) * | 2018-06-29 | 2018-11-23 | 扬州市职业大学 | A kind of bench drill drilling cross laser positioning device |
| CN110877114A (en) * | 2018-09-05 | 2020-03-13 | 中航贵州飞机有限责任公司 | Linear drill jig |
-
2005
- 2005-05-12 CN CN 200520083058 patent/CN2788941Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209549A (en) * | 2013-05-31 | 2014-12-17 | 浙江欣兴工具有限公司 | Drilling machine with optical positioning device |
| CN104209548A (en) * | 2013-05-31 | 2014-12-17 | 浙江欣兴工具有限公司 | Drilling machine provided with mechanical positioning device |
| CN104209549B (en) * | 2013-05-31 | 2017-02-08 | 浙江欣兴工具有限公司 | Drilling machine with optical positioning device |
| CN107378070A (en) * | 2017-07-17 | 2017-11-24 | 大连理工大学 | One kind drilling accurate positioning method |
| CN108856816A (en) * | 2018-06-29 | 2018-11-23 | 扬州市职业大学 | A kind of bench drill drilling cross laser positioning device |
| CN108856816B (en) * | 2018-06-29 | 2024-06-11 | 扬州市职业大学 | A cross laser positioning device for bench drilling |
| CN110877114A (en) * | 2018-09-05 | 2020-03-13 | 中航贵州飞机有限责任公司 | Linear drill jig |
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| CF01 | Termination of patent right due to non-payment of annual fee |