CN104385785A - Laser marking machine and material distributing and material blocking mechanism thereof - Google Patents
Laser marking machine and material distributing and material blocking mechanism thereof Download PDFInfo
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- CN104385785A CN104385785A CN201410506036.7A CN201410506036A CN104385785A CN 104385785 A CN104385785 A CN 104385785A CN 201410506036 A CN201410506036 A CN 201410506036A CN 104385785 A CN104385785 A CN 104385785A
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Abstract
Disclosed is a material distributing and material blocking mechanism. The material distributing and material blocking mechanism comprises a base, a first driving source, a rotation plate, a material distributing and material blocking block and a first fixation baffle plate. The material distributing and material blocking block is arranged on the rotation plate, and the material distributing and material blocking block is provided with a first side surface and a second side surface adjacent to the first side surface. As the rotation plate rotates, the included angle formed between the first side surface and the transmission direction of a bearing transmission bench is gradually decreased, the included angle formed between the second side surface and the transmission direction of the bearing transmission bench is gradually increased, and the first side surface is a recessed surface. Since material distributing motion and material blocking motion are carried out simultaneously, such that the motion time difference is eliminated, and accordingly, the production period of a bearing is shortened. The invention simultaneously provides a laser marking machine applied to the material distributing and material blocking mechanism.
Description
Technical field
The present invention relates to laser marking device technical field, particularly relate to a kind of laser marking machine and sub-material stock stop thereof.
Background technology
Laser marking technology is one of maximum application of Laser Processing.Laser marking utilizes the laser of high-energy-density to carry out local irradiation to workpiece, skin-material vaporized or the chemical reaction of color change occurs, thus leaving a kind of marking method of permanent marker.Laser marking machine can get various word, symbol and pattern etc., and character boundary can from millimeter to micron dimension, and this has special meaning to the false proof of product.
Along with the development of bearing industry, adopt the mode of laser marking also more and more extensive in the application of bearing industry, on bearing, such as mark Quick Response Code, bar code, bearing designation or produce serial number etc.And the technique that the production of bearing is large as a kind of batch, efficiency is high, for laser marking machine efficiency, complete machine stability and different bearing size compatibility is had higher requirement.
Traditional laser marking machine is usually poor owing to there is actuation time between sub-material and backgauge two operation step, causes the time extending laser marking, extends the production cycle of bearing.
Summary of the invention
Based on this, be necessary to there is the poor problem causing the production cycle extending bearing actuation time, the laser marking machine providing a kind of sub-material and backgauge simultaneously to carry out the production cycle shortening bearing and sub-material stock stop thereof for sub-material and backgauge.
A kind of sub-material stock stop, be applied on laser marking machine, this laser marker organic frame and the carrying transfer station be arranged in frame, this sub-material stock stop comprises:
Base, is arranged in the frame of laser marking machine;
First drive source, is arranged on described base, for providing power;
Rotor plate, is arranged on described base rotationally, and described drive source can drive described rotor plate to rotate;
Sub-material material blocking block, is arranged on described rotor plate; And
First fixed dam, is arranged in the frame of described laser marking machine, and described sub-material material blocking block and described first fixed dam lay respectively at the both sides of the carrying transfer station of laser marking machine;
Wherein, described sub-material material blocking block has the first side and second side adjacent with described first side, along with the rotation of described rotor plate, formed by the direction of transfer of described first side and described carrying transfer station, angle reduces gradually, formed by the direction of transfer of described second side and described carrying transfer station, angle increases gradually, and described first side is concave surface.
Wherein in an embodiment, described first side is circular arc concave surface.
Wherein in an embodiment, also comprise pole and rolling bearing, one end of described pole is fixed on described base, and described rolling bearing is arranged on described pole, described rotor plate offers the first through hole, described rolling bearing is arranged in described first through hole.
Wherein in an embodiment, described first drive source is cylinder, and described cylinder is fixed on described base by installing plate, is all provided with position sensor corresponding to the initial position of the expansion link of described cylinder and extended position.
Wherein in an embodiment, also comprise turning cylinder and swivel, described swivel is connected with the free end of the expansion link of described cylinder, described rotor plate offers the first elongate holes, described swivel offers the second through hole, described turning cylinder is arranged in described first elongate holes and described second through hole successively, and when swivel described in described air cylinder driven moves, described rotor plate rotates with the motion of described swivel.
Whether wherein in an embodiment, also comprise first sensor, described first sensor is arranged on described sub-material material blocking block, move to and described sub-material stock stop corresponding position for detecting workpiece.
A kind of laser marking machine, comprising:
Frame;
Carrying transfer station, is arranged in described frame, and described carrying transfer station is used for carrying and conveying work pieces;
Sub-material stock stop as described in above any one;
Detent mechanism, to be arranged in described frame and after being positioned at described sub-material stock stop, described detent mechanism comprises the second drive source, locator card gripping member and the second fixed dam, described second drive source is for driving described locator card gripping member reciprocating, and described locator card gripping member and described second fixed dam lay respectively at the both sides of described carrying transfer station; And
Laser instrument, is arranged in described frame, and described laser instrument is used for Emission Lasers and carries out mark to described workpiece, when workpiece is by described locator card gripping member and described second fixed part location, and the mark on the workpiece of described laser instrument.
Wherein in an embodiment, described base offers the second elongate holes, described frame offers the 3rd elongate holes, be arranged in successively in described second elongate holes and described 3rd elongate holes so that described base is arranged in described frame by securing member.
Wherein in an embodiment, also comprise the second sensor, whether described second sensor setting, after described detent mechanism, flows out from described detent mechanism for detecting workpiece.
Wherein in an embodiment, the both sides of described carrying transfer station are also provided with backplate, and described backplate makes it move, after described backplate is positioned at described detent mechanism along carrying transfer station for limiting workpiece.
Above-mentioned laser marking machine and sub-material stock stop thereof at least comprise following advantage:
During work, treat that the workpiece of mark is positioned in carrying transfer station by multiple, carrying transfer station is with a specific speed transmission, workpiece is travelled forward, when last workpiece motion s is to sub-material stock stop station, blocked by the first side of sub-material material blocking block and the first fixed dam, the first side and first fixed dam of this workpiece and sub-material material blocking block contact; First drive source orders about rotor plate and rotates thus drive sub-material material blocking block to rotate, formed by the direction of transfer of the first side and carrying transfer station, angle reduces gradually, formed by the direction of transfer of the second side and carrying transfer station, angle increases gradually, last workpiece flows out sub-material stock stop to be continued to move forward, owing to there is larger space between former and later two workpiece, a rear workpiece is blocked by the second side and the first fixed dam, cannot move forward together with last workpiece; When last workpiece moves to detent mechanism station soon, the second drive source orders about the motion of locator card gripping member, makes when workpiece motion s is to detent mechanism station, and locator card gripping member coordinates with the second fixed dam and holds workpiece; Laser instrument sends laser and carries out mark to workpiece; After mark completes, last workpiece flows out detent mechanism station, first drive source orders about rotor plate again and does return motion, rotor plate is toward back rotation, a rear workpiece continues to move forward, until contact with the first side of sub-material material blocking block and the side of the first fixed dam, then repeat the step identical with last workpiece.Because sub-material action and backgauge action are synchronously carried out, eliminate actuation time poor, and then shorten the production cycle of bearing.
Accompanying drawing explanation
Fig. 1 is the structural representation of laser marking machine in an embodiment;
Fig. 2 is sub-material stock stop partial schematic diagram in Fig. 1;
Fig. 3 is the explosive decomposition figure of partial schematic diagram shown in Fig. 2;
Fig. 4 is the partial schematic diagram of detent mechanism in Fig. 1;
Fig. 5 to Figure 10 is for laser marking machine shown in Fig. 1 is from the ready top view completed to mark of workpiece.
Detailed description of the invention
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement just for illustrative purposes, do not represent it is unique embodiment.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Referring to Fig. 1, is the structural representation of the laser marking machine 10 in an embodiment.Laser marking machine can be the laser marking machine of the types such as optical-fiber laser, carbon dioxide laser or Ultra-Violet Laser.Laser marking machine 10 in present embodiment comprises frame 100, carrying transfer station 200, sub-material stock stop 300, detent mechanism 400 and laser instrument.
Frame 100 mainly plays a supportive role, for parts such as support bearing transfer station 200, sub-material stock stop 300, detent mechanism 400, elevating mechanism 500 and laser instruments.
Carrying transfer station 200 is mainly used in carrying and conveying work pieces 20.Such as, the streamline that transfer station 200 can be the form such as belt or plate chain is carried.During duty, carrying transfer station 200 drives workpiece 20 constantly to move forward.Specific in present embodiment, workpiece 20 can be bearing, marks Quick Response Code, bar code, bearing designation or produce serial number etc. by laser marking machine 10 on bearing.Certainly, in other embodiments, workpiece 20 can also be the structure of the cylindrical shapes such as can, milk bottle or medicine bottle.
See also Fig. 2 to Fig. 3, sub-material stock stop 300 comprises base 310, first drive source 320, turning cylinder 330, swivel 340, pole 350, rolling bearing 360, rotor plate 370, sub-material material blocking block 381, first fixed dam 382 and first sensor 391.
Base 310 is arranged in the frame 100 of laser marking machine 10.Particularly, the second elongate holes 311 can be offered on base 310, in frame 100, offer the 3rd elongate holes (figure does not mark) again, be then arranged in successively in the second elongate holes 311 and the 3rd elongate holes (figure does not mark) so that base 310 is arranged in frame 100 by securing member.Second elongate holes 311 is identical with the quantity of the 3rd elongate holes (scheming not mark), can be multiple.When changing identical jobs, almost can not change overall structure and just can use, especially more remarkable than effect time faster in model change.Such as, be that the bearing replacing of 52mm becomes external diameter to be the bearing of 22mm by external diameter, only need turn on securing member, the relative installation of adjustment base 310 and frame 100, to change the spacing between sub-material material blocking block 381 and the first fixed dam 382, thus the bearing of various outer diameter can be clamped.In present embodiment, the bearing of 10mm ~ 52mm scope internal-and external diameter can be clamped.
First drive source 320 is cylinder, and cylinder is fixed on base 310 by installing plate 321.Particularly, position sensor 322 is all provided with, for the retracted position of perception cylinder corresponding to the initial position of the expansion link of cylinder and extended position.Swivel 340 is connected with the free end of the expansion link of cylinder, swivel 340 offers the second through hole 341.Turning cylinder 330 is arranged in the second through hole 341.Certainly, in other embodiments, the first drive source 320 can also be electronic or various forms of cylinder body or driving power device.
One end of pole 350 is fixed on base 310.Particularly, one end of pole 350 is fixed on base 310 by cushion block 352, cushion block 352 is offered a through hole, is then arranged in through hole by one end of pole 350, makes pole 350 in upright state.The middle part of pole 350 is radially outstanding is formed with bulge loop 351, and bulge loop 351 is for support rotating bearing 360.Rolling bearing 360 is arranged on pole 350, and can also arrange back-up ring 353 at rolling bearing 360 towards that side of the free end of pole 350, back-up ring 353 is for preventing rolling bearing about 360 play being contained in pole 350.Rolling bearing 360 can be deep groove ball bearing.
Rotor plate 370 offers the first through hole 371, rolling bearing 360 is arranged in the first through hole 371, thus rotor plate 370 can be rotated relative to pole 350.Certainly, the object arranging rolling bearing 360 is the flexibility of rotating to increase rotor plate 370, in other embodiments, when the flexibility when rotor plate 370 rotates is enough large, can also omit rolling bearing 360.Rotor plate 370 also offers the first elongate holes 372, turning cylinder 330 is arranged in the first elongate holes 372 and the second through hole 341 successively.When air cylinder driven swivel 340 moves, rotor plate 370 rotates with the motion of swivel 340.When the expansion link of cylinder stretches out, swivel 340 moves along the direction away from cylinder, and turning cylinder 330 also moves with the motion of swivel 340, and turning cylinder 330 is mobile in the first elongate holes 372, thus drives rotor plate 370 to rotate.Certainly, in other embodiments, can also directly promote rotor plate 370 rotate by cylinder, can also be promote rotor plate 370 by rack-and-pinion to rotate, can also be the mode that motor direct-drive rotor plate 370 rotates.
Sub-material material blocking block 381 and the first fixed dam 382 lay respectively at the both sides carrying transfer station 200.Particularly, the first fixed dam 382 is fixed in frame 100.Particularly, also corresponding elongate holes can be offered respectively on the first fixed dam 382 and frame 100, then by the relative position of change first fixed dam 382 with frame 100, change the spacing between the first fixed dam 382 and sub-material material blocking block 381, to adapt to the workpiece of various outer diameter.Sub-material material blocking block 381 is arranged on rotor plate 370, and particularly, sub-material material blocking block 381 is fixed on rotor plate 370, rotates with the rotation of rotor plate 370.
Sub-material material blocking block 381 has the first side 3811 and the second side 3812.First side 3811 is disposed adjacent with the second side 3812.Along with the rotation of rotor plate 370, formed by the direction of transfer of the first side 3811 and carrying transfer station 200, angle reduces gradually, and formed by the direction of transfer of the second side 3812 and carrying transfer station 200, angle increases gradually.Particularly, the first side 3811 can be circular arc concave surface.Second side can be plane or cambered surface etc.Because workpiece 20 can be the structure of the cylindrical shape such as bearing, can, between the exterior arc surface of adjacent two workpiece in front and back, there is very large space, when sub-material material blocking block 381 rotates, first side 3811 of sub-material material blocking block 381 is similar to tangent action with last workpiece, while last workpiece flows out sub-material stock stop 300, match with the first fixed dam 382 in second side 3812 of sub-material material blocking block 381, a workpiece after can blocking.Namely, the rib of the dihedral angle formed between the first side 3811 and the second side 3812 stretches between last workpiece and a rear workpiece, ensure that last workpiece can flow out sub-material stock stop 300 smoothly, then a workpiece is blocked by the second side 3812 and the first fixed dam 382.
Whether first sensor 391 is arranged on sub-material material blocking block 381, move to and sub-material stock stop 300 corresponding position for detecting workpiece 20.First sensor 391 can be close to inductor, fiber sensor or photoelectric sensor.
See also Fig. 4, detent mechanism 400 to be arranged in frame 100 and after being positioned at the station of sub-material stock stop 300.Detent mechanism 400, for positioning workpieces 20, comprises the second drive source 410, locator card gripping member 420 and the second fixed dam 430.Second drive source 410 is for driving locator card gripping member 420 reciprocating.Particularly, the second drive source 410 can be electronic or pneumatic various forms of cylinder body or driving power device.Locator card gripping member 420 such as can for having the locating piece of V-arrangement side or the locating piece for having circular arc concave flanks.Second fixed dam 430 lays respectively at locator card gripping member 420 both sides carrying transfer station 200.When workpiece 20 moves to detent mechanism 400 station soon, second drive source 410 drives locator card gripping member 420 to move, when workpiece 20 just in time moves to corresponding with detent mechanism 400 local time, locator card gripping member 420 matches with the second fixed dam 430, is held by workpiece 20 with location.Position corresponding to detent mechanism 400 is also provided with proximity transducer (figure does not mark), and whether proximity transducer (figure does not mark) is located by locator card gripping member 420 and the second fixed dam 430 for detecting workpiece.
Please again consult Fig. 1, laser instrument comprises elevating mechanism 500, laser girder 600 and LASER Light Source.Elevating mechanism 500 is arranged in frame 100.Laser girder 600 is arranged on elevating mechanism 500, and elevating mechanism 500 can do elevating movement by driving laser girder 600.LASER Light Source (not shown) is arranged on laser girder 600, LASER Light Source (not shown) is used for Emission Lasers and carries out mark to workpiece 20, when workpiece 20 is located by locator card gripping member 420 and the second fixed dam 430, the mark on workpiece 20 of LASER Light Source (not shown).
Whether laser marking machine 10 also arranges after the second sensor 392, second sensor 392 is arranged at detent mechanism 400 station, flow out for detecting workpiece 20 from detent mechanism 400.After workpiece 20 mark terminates, second drive source 410 orders about locator card gripping member 420 and does return motion, workpiece 20 is under the effect that holds not having locator card gripping member 420 and the second fixed dam 430, carrying transfer station 200 makes workpiece 20 move forward, when the second sensor 392 detects workpiece 20, illustrate that workpiece 20 flows out from detent mechanism 400.
Please again consult Fig. 1, the both sides of carrying transfer station 200 are also provided with backplate 210, and backplate 210 makes it move, after backplate 210 is positioned at detent mechanism 400 station along carrying transfer station 200 for limiting workpiece 20.From detent mechanism 400 flow out workpiece 20 under the effect of backplate 210, can only along carrying transfer station 200 move.
Above-mentioned laser marking machine 10 and sub-material stock stop 300 thereof at least comprise following advantage:
See also Fig. 5, during work, treat that workpiece 20 interval of mark is positioned in carrying transfer station 200 by multiple, carrying transfer station 200 makes workpiece 20 travel forward with a specific speed transmission, when last workpiece motion s is to sub-material stock stop 300 station, first sensor 391 senses that workpiece is in place, and now workpiece is blocked by the first side 3811 of sub-material material blocking block 381 and the first fixed dam 382, and the first side 3811 and first fixed dam 382 of this workpiece and sub-material material blocking block 381 contact.See also Fig. 6, first drive source 320 orders about rotor plate 370 and rotates thus drive sub-material material blocking block 381 to rotate, formed by the direction of transfer of the first side 3811 and carrying transfer station 200, angle reduces gradually, formed by the direction of transfer of the second side 3812 and carrying transfer station 200, angle increases gradually, and last workpiece flows out sub-material stock stop 300 to be continued to move forward; Then a workpiece is blocked by sub-material material blocking block 381 second side 3812 and the first fixed dam 382, cannot move forward together with last workpiece.See also Fig. 7 to Fig. 8, last workpiece flows out sub-material stock stop 300, by the time delay regular hour, when workpiece moves to detent mechanism 400 station soon, second drive source 410 orders about locator card gripping member 420 and moves, make when workpiece motion s is to detent mechanism 400 station, locator card gripping member 420 coordinates with the second fixed dam 430 and holds workpiece.Such as, specific in present embodiment, the external diameter of bearing 20 is 52mm, the transfer rate of carrying transfer station is 500mm/s, previous bearing is 120mm to the centre-to-centre spacing of locator card gripping member 420, then about 0.2s after backgauge feeding distribution mechanism 300 action, the second drive source 410 promotes locator card gripping member 420 and moves.Refer to Fig. 9, in order to ensure accurate positioning, when proximity transducer sensing bearing has put signal in place, the signal that laser girder 600 receives proximity transducer just starts according to actual requirement mark Quick Response Code, bar code, bearing designation or produces serial number etc., elevating mechanism 500 orders about laser girder 600 and moves, when laser girder 600 is corresponding with the location of workpiece, LASER Light Source (not shown) sends laser and carries out mark to workpiece.Meanwhile, the first drive source 320 orders about rotor plate 370 and does return motion, and rotor plate 370 is toward back rotation, and a rear workpiece continues to move forward, until contact with the first side 3811 of sub-material material blocking block 381 and the side of the first fixed dam 382.Refer to Figure 10, after mark completes, last workpiece flows out detent mechanism 400 station, and a rear workpiece is ready.Because sub-material action and backgauge action are synchronously carried out, eliminate actuation time poor, and then shorten the production cycle of bearing.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a sub-material stock stop, is applied on laser marking machine, and this laser marker organic frame and the carrying transfer station be arranged in frame, is characterized in that, this sub-material stock stop comprises:
Base, is arranged in the frame of laser marking machine;
First drive source, is arranged on described base, for providing power;
Rotor plate, is arranged on described base rotationally, and described drive source can drive described rotor plate to rotate;
Sub-material material blocking block, is arranged on described rotor plate; And
First fixed dam, is arranged in the frame of described laser marking machine, and described sub-material material blocking block and described first fixed dam lay respectively at the both sides of the carrying transfer station of laser marking machine;
Wherein, described sub-material material blocking block has the first side and second side adjacent with described first side, along with the rotation of described rotor plate, formed by the direction of transfer of described first side and described carrying transfer station, angle reduces gradually, formed by the direction of transfer of described second side and described carrying transfer station, angle increases gradually, and described first side is concave surface.
2. sub-material stock stop according to claim 1, is characterized in that, described first side is circular arc concave surface.
3. sub-material stock stop according to claim 1, it is characterized in that, also comprise pole and rolling bearing, one end of described pole is fixed on described base, described rolling bearing is arranged on described pole, described rotor plate offers the first through hole, described rolling bearing is arranged in described first through hole.
4. sub-material stock stop according to claim 3, it is characterized in that, described first drive source is cylinder, and described cylinder is fixed on described base by installing plate, is all provided with position sensor corresponding to the initial position of the expansion link of described cylinder and extended position.
5. sub-material stock stop according to claim 4, it is characterized in that, also comprise turning cylinder and swivel, described swivel is connected with the free end of the expansion link of described cylinder, described rotor plate offers the first elongate holes, described swivel offers the second through hole, described turning cylinder is arranged in described first elongate holes and described second through hole successively, when swivel described in described air cylinder driven moves, described rotor plate rotates with the motion of described swivel.
6. whether sub-material stock stop according to claim 1, is characterized in that, also comprise first sensor, and described first sensor is arranged on described sub-material material blocking block, move to and described sub-material stock stop corresponding position for detecting workpiece.
7. a laser marking machine, is characterized in that, comprising:
Frame;
Carrying transfer station, is arranged in described frame, and described carrying transfer station is used for carrying and conveying work pieces;
Sub-material stock stop as described in claim 1 to 6 any one;
Detent mechanism, to be arranged in described frame and after being positioned at described sub-material stock stop, described detent mechanism comprises the second drive source, locator card gripping member and the second fixed dam, described second drive source is for driving described locator card gripping member reciprocating, and described locator card gripping member and described second fixed dam lay respectively at the both sides of described carrying transfer station; And
Laser instrument, is arranged in described frame, and described laser instrument is used for Emission Lasers and carries out mark to described workpiece, when workpiece is by described locator card gripping member and described second fixed part location, and the mark on the workpiece of described laser instrument.
8. laser marking machine according to claim 7, it is characterized in that, described base offers the second elongate holes, described frame offers the 3rd elongate holes, be arranged in successively in described second elongate holes and described 3rd elongate holes so that described base is arranged in described frame by securing member.
9. laser marking machine according to claim 7, is characterized in that, also comprises the second sensor, and whether described second sensor setting, after described detent mechanism, flows out from described detent mechanism for detecting workpiece.
10. laser marking machine according to claim 7, is characterized in that, the both sides of described carrying transfer station are also provided with backplate, and described backplate makes it move, after described backplate is positioned at described detent mechanism along carrying transfer station for limiting workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506036.7A CN104385785B (en) | 2014-09-27 | Laser marking machine and sub-material stock stop thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506036.7A CN104385785B (en) | 2014-09-27 | Laser marking machine and sub-material stock stop thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104385785A true CN104385785A (en) | 2015-03-04 |
| CN104385785B CN104385785B (en) | 2017-01-04 |
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| CN104999803A (en) * | 2015-07-03 | 2015-10-28 | 宁波科镭仕激光科技有限公司 | Automatic laser marking machine for bearing |
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