CN113485068A - 3D display device - Google Patents

3D display device Download PDF

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Publication number
CN113485068A
CN113485068A CN202110833345.5A CN202110833345A CN113485068A CN 113485068 A CN113485068 A CN 113485068A CN 202110833345 A CN202110833345 A CN 202110833345A CN 113485068 A CN113485068 A CN 113485068A
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China
Prior art keywords
groove
frame
screw
block
rod
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CN202110833345.5A
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Chinese (zh)
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旷佩华
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Individual
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Individual
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Priority to CN202110833345.5A priority Critical patent/CN113485068A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/54Accessories
    • G03B21/56Projection screens
    • G03B21/58Projection screens collapsible, e.g. foldable; of variable area
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/54Accessories

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Displays For Variable Information Using Movable Means (AREA)

Abstract

The invention discloses a 3D display device, which comprises a U-shaped frame, wherein a rotating roller is rotatably arranged at one end of the opening direction of the frame, a mounting block is fixedly sleeved outside the rotating roller, a winding component for winding a curtain is mounted on the mounting block, a turning component for driving the rotating roller to rotate is arranged inside the frame, and a projection component for projecting the curtain is arranged on the frame. Thereby solving the problem that the use environment is limited.

Description

3D display device
Technical Field
The invention relates to the technical field of 3D (three-dimensional) equipment, in particular to 3D display equipment.
Background
The 3D display technology is a novel display technology, and is compared with ordinary 2D picture display, and the 3D technology can make the picture become three-dimensional lifelike, and the image no longer restricts in the plane of screen on, seems to go out the screen outside, lets spectator have the sensation of being personally on the scene, and 3D technical classification can divide into glasses formula and bore hole formula two main types. The naked-eye 3D technology is mainly used in public business occasions and can be applied to portable equipment such as mobile phones in the future, and the description is omitted here. In the field of home consumer, no matter a display, a projector or a television, 3D glasses need to be used, and in the glasses type 3D technology, three main types can be subdivided: color difference, polarization, and active shutter, which are commonly known as color separation, light separation, and time separation. Current 3D display device is when the installation, the curtain that all makes formation of image is vertical to be placed, then throw, therefore, the prerequisite that current 3D display device used is that the curtain is vertical to be placed, thereby conveniently form images, but, we are when using, customer's service environment need be considered, the structure of the compound floor of upper and lower two-layer is all to most of the young of city now, therefore, current 3D display device places when one floor, because the curtain is vertical placing, consequently, we are located the unable direct viewing content in the rest area on second floor, thereby lead to service environment to receive the restriction, for this reason, we provide a 3D display device.
Disclosure of Invention
The invention aims to provide a 3D display device which has the advantage of imaging that a curtain can be removed when the curtain is not in a vertical state, and solves the problem that the use environment is limited.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a 3D display device, is including the frame that is U type design, the one end of frame opening direction is rotated and is installed the live-rollers, and the fixed cover in the live-rollers outside has connect the installation piece, install on the installation piece and be used for realizing carrying out the rolling subassembly of rolling to the curtain, the frame is inside to be provided with and to be used for driving the live-rollers and carry out the pivoted upset subassembly, be provided with on the frame and be used for carrying out the projected subassembly to the curtain.
Preferably, the winding assembly comprises a first motor, a groove, a first screw rod, a first screw block, a pull rod, a fixed block, a containing cylinder, a winding rod and a disk spring, the groove is formed in the inner part of the mounting block, the first motor is fixedly mounted at the position of the groove of the frame, the output end of the first motor is fixedly connected with the first screw rod, the first screw rod penetrates through the groove and is rotatably connected with the other end of the frame, the first screw block is sleeved on the outer thread of the first screw rod and is slidably connected with the inner part of the groove, the fixed block is fixedly mounted on the outer side of one end, away from the first motor, of the mounting block, the containing cylinder is arranged on the fixed block, the winding rod is rotatably connected with the inner part of the containing cylinder, the disk spring is fixedly connected with the top end and the bottom end of the winding rod, the winding rod is elastically connected with the containing cylinder through the disk spring, the pull rod is inserted into the top of the first screw block, the curtain is wound on the outer side of the winding rod, and one end of the curtain penetrates out of the storage barrel and is fixedly connected with the pull rod.
Preferably, one side of the storage barrel is provided with an outlet for allowing the curtain to penetrate out, and the projection of the outlet on the plane is superposed with the projection of the groove on the plane.
Preferably, the top of the fixed block is provided with a cross groove, the bottom of the containing barrel is fixedly provided with a cross block, and the containing barrel is connected with the fixed block through the sliding insertion of the cross block and the cross groove.
Preferably, the turnover component comprises a second motor, a second screw rod, a second screw block, a bottom rod, a bearing plate, a through groove, a chute, a limiting block, a first supporting arm and a second supporting arm, the bottom of the frame is fixedly provided with the second motor, the bottom rod is fixedly arranged in the frame, the output end of the second motor is fixedly connected with the second screw rod, the other end of the second screw rod is rotatably connected with the bottom rod, the outer side of the second screw rod is in threaded connection with the second screw block, the two sides of the frame are provided with the through groove, the bearing plate is slidably connected in the through groove, the bottom of the bearing plate is fixedly connected with the top of the second screw block, the two sides of the frame are provided with the chute communicated with the through groove, the two sides of the bearing plate far away from one end of the second motor are rotatably connected with the first supporting arm, and the internal fixedly connected with the limiting block slidably inserted in the chute, and the two sides of the rotating shaft of the rotating roller are fixedly connected with second support arms, and the other ends of the second support arms are rotatably connected with the first support arms.
Preferably, the second motor drives the second screw rod to rotate, so that the length of the second screw block driving the bearing plate to move is equal to the arc length of the second support arm rotating by 90 degrees.
Preferably, the length of the through groove is equal to the sum of the width of the bearing plate and the length of the arc length of the second support arm which rotates by 90 degrees.
Preferably, the projection assembly comprises a projector and a reflective layer, the projector is rotatably arranged at one end of the frame, and the reflective layer is arranged at the top of the bearing plate.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, after the curtain is opened, the curtain is driven by the turnover mechanism through the turnover assembly and the rolling assembly, so that an included angle exists between the curtain and the bearing plate, the projector emits a light source through rotating the projector, the light source is transmitted to the curtain through reflection of the reflecting layer, imaging is completed, and projection of contents can be realized on the basis that the turnover angle of the curtain is larger than zero through the reflection effect of the reflecting layer and the principle of reflection of light, so that the problem that the use environment is limited is solved.
The working stroke of the second motor can enable the rolling component to carry the curtain to turn over for 90 degrees, so that the whole device can be in a horizontal state or a vertical state in an unfolding mode, and the curtain can be better accommodated and carried.
Thirdly, the second screw rod is engaged with the second screw block in a rotating way through the rotation of the working shaft of the second motor, and because the top of the second screw block is fixedly connected with the bearing plate, the external bearing plate is connected in the through groove in a sliding way, thereby the second screw block can drive the bearing plate to horizontally move, and the first supporting arm can be pushed to move the limiting block to slide in the chute in the moving process of the bearing plate, thereby the first support arm is turned over, the first support arm and the second support arm rotate, the second support arm drives the rotating roller to rotate for 90 degrees, therefore, the whole rolling component is changed from a horizontal state to a vertical state, and in the process of overturning, people can change the rolling component from the horizontal state to the vertical state according to the requirements of the use environment, therefore, the winding component is designed to be inclined at a certain angle, and the use efficiency of people in daily use is further facilitated.
And fourthly, an outlet for allowing the curtain to penetrate out is formed in one side of the containing barrel, the projection of the outlet on the plane is superposed with the projection of the groove on the plane, and in order to keep the curtain horizontal, the problem that the curtain is inclined at an angle when being pulled out from the containing barrel is solved, so that the shadow watching effect is improved.
Drawings
Fig. 1 is a schematic perspective view of a 3D display device according to the present invention;
fig. 2 is a schematic structural diagram of a flip assembly of a 3D display device according to the present invention;
FIG. 3 is a schematic diagram of a three-dimensional partial structure of a 3D display device according to the present invention;
fig. 4 is a schematic structural diagram of a winding assembly of a 3D display device inside an installation block according to the present invention;
fig. 5 is a schematic view of an internal structure of a storage barrel of a 3D display device according to the present invention;
fig. 6 is a schematic view of a connecting structure between a storage barrel and a fixing block of a 3D display device according to the present invention;
fig. 7 is a schematic structural diagram of an operating principle of a projection assembly of a 3D display device according to the present invention when a curtain forms an angle of 45 °;
fig. 8 is a schematic structural diagram of an operating principle of a projection assembly of a 3D display device according to the present invention when a curtain forms an angle of 90 °;
in the figure: 1. a frame; 2. a rotating roller; 3. mounting blocks; 4. a curtain; 5. a winding component; 501. a first motor; 502. a groove; 503. a first screw; 504. a first screw block; 505. a pull rod; 506. a fixed block; 507. a storage cylinder; 508. rolling the rod; 509. a disc spring; 6. a turnover assembly; 601. a second motor; 602. a second screw; 603. a second screw block; 604. a bottom bar; 605. a bearing plate; 606. a through groove; 607. a chute; 308. a limiting block; 609. a first support arm; 610. a second support arm; 7. a projection assembly; 701. a projector; 702. a light-reflecting layer; 8. an outlet; 9. a cross groove; 10. a cross block.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 8, the present invention provides a technical solution: the utility model provides a 3D display device, is including the frame 1 that is U type design, the one end of 1 opening direction of frame is rotated and is installed rotor 2, and the fixed installation piece 3 that has cup jointed in the 2 outsides of rotor, install on the installation piece 3 and be used for realizing carrying out the rolling subassembly 5 of rolling to curtain 4, 1 inside being provided with of frame is used for driving rotor 2 and carries out pivoted upset subassembly 6, be provided with on the frame 1 and be used for carrying out projected projection subassembly 7 to curtain 4.
Referring to fig. 1, 3, 4, 5 and 6, the winding assembly 5 includes a first motor 501, a groove 502, a first screw 503, a first screw 504, a pull rod 505, a fixing block 506, a receiving cylinder 507, a winding rod 508 and a belleville spring 509, the groove 502 is formed in the mounting block 3, the first motor 501 is fixedly mounted at the position of the groove 502 of the frame 1, the first screw 503 is fixedly connected to an output end of the first motor 501, the first screw 503 passes through the groove 502 and is rotatably connected to the other end of the frame 1, the first screw 504 is sleeved on an external thread of the first screw 503, the first screw 504 is slidably connected to the inside of the groove 502, the fixing block 506 is fixedly mounted on an outer side of one end of the mounting block 3 far from the first motor 501, the receiving cylinder 507 is arranged on the fixing block 506, the winding rod 508 is rotatably connected to the inside of the receiving cylinder 507, both the top end and the bottom end of the winding rod 508 are fixedly connected to the belleville spring 509, and the winding rod 508 is elastically connected with the storage cylinder 507 through a disc spring 509, the pull rod 505 is inserted into the top of the first screw block 504, the curtain 4 is wound on the outer side of the winding rod 508, one end of the curtain 4 penetrates out of the storage cylinder 507 and is fixedly connected with the pull rod 505, the first screw 503 and the first screw block 504 are driven to rotate in a threaded manner through the first motor 501, so that the first screw block 504 slides linearly inside the groove 502, the first screw block 504 moves in a direction far away from the storage cylinder 507 through driving the pull rod 505, and the pull rod 505 drives the curtain 4 to slide out from the storage cylinder 507 so as to image.
Referring to fig. 5, an outlet 8 through which the curtain 4 passes is formed at one side of the storage cylinder 507, and a projection of the outlet 8 on the plane coincides with a projection of the groove 502 on the plane, so as to keep horizontal, thereby avoiding a problem of inclination of an angle when the curtain 4 is pulled out from the storage cylinder 507, and improving a viewing effect.
Referring to fig. 5 to 6, a cross groove 9 is formed in the top of the fixing block 506, a cross block 10 is fixedly mounted at the bottom of the storage cylinder 507, the storage cylinder 507 is connected to the fixing block 506 through the sliding insertion of the cross block 10 and the cross groove 9, and therefore, the component inside the storage cylinder 507 can be conveniently repaired in order to facilitate the disassembly of the component.
Referring to fig. 1 to 3, the turning assembly 6 includes a second motor 601, a second screw 602, a second screw block 603, a bottom rod 604, a receiving plate 605, a through groove 606, a chute 607, a limiting block 308, a first supporting arm 609 and a second supporting arm 610, the second motor 601 is fixedly installed at the bottom of the frame 1, the bottom rod 604 is fixedly installed inside the frame 1, the output end of the second motor 601 is fixedly connected with the second screw 602, the other end of the second screw 602 is rotatably connected with the bottom rod 604, the second screw block 603 is threadedly connected to the outer side of the second screw 602, the through groove 606 is opened at two sides of the frame 1, the receiving plate 605 is slidably connected inside the through groove 606, the bottom of the receiving plate 605 is fixedly connected with the top of the second screw block 603, the chute 607 is opened at two sides of the frame 1, the first supporting arm 609 is rotatably connected to two sides of the receiving plate 605 far away from one end of the second motor 601, and the inside of the first support arm 609 is fixedly connected with a limit block 308 which is inserted and connected with the chute 607 in a sliding manner, two sides of the rotating shaft of the rotating roller 2 are fixedly connected with a second support arm 610, and the other end of the second support arm 610 is rotatably connected with the first support arm 609, when in use, the second screw 602 is rotatably engaged with the second screw 603 by the rotation of the working shaft of the second motor 601, and the top of the second screw 603 is fixedly connected with the bearing plate 605, and the bearing plate 605 is connected inside the through groove 606 in a sliding manner, so that the bearing plate 605 is driven by the second screw 603 to move horizontally, and in the moving process of the bearing plate 605, the first support arm 609 is pushed to move the limit block 308 to slide inside the chute 607, so that the first support arm 609 is turned over, and the first support arm 609 and the second support arm 610 perform a rotating movement, so that the second support arm 610 drives the rotating roller 2 to perform a 90-degree circumferential rotation, thereby make rolling component 5's whole from the horizontality to become vertical state, and at the in-process of upset, we can be according to service environment's demand to make rolling component 5 be the slope design of certain angle, thereby be favorable to the availability factor of us in daily use more.
Referring to fig. 1 to 3, the second motor 601 drives the second screw 602 to rotate, so that the second screw 603 drives the receiving plate 605 to move by a length equal to the arc length of the second arm 610 rotating by 90 °, and the movement track of the receiving plate 605 is limited and the movement length is equal to the arc length of the second arm 610 rotating by 90 °, so that the winding assembly 5 with the curtain 4 can be turned by 90 ° in the working stroke of the second motor 601, and the whole device can be in a horizontal state or a vertical state of unfolding, thereby better accommodating and carrying effects.
Referring to fig. 1 to 3, the length of the through groove 606 is equal to the sum of the width of the receiving plate 605 and the arc length of the second support arm 610 rotating by 90 °, because the second motor 601 is connected with the second screw 602 through the screw thread between the second screw 603 when operating, so as to drive the receiving plate 605 to move inside the through groove 606, and because the through groove 606 and the chute 607 are communicated with each other, but there is an angle difference between the through groove 606 and the chute 607, in order to prevent the receiving plate 605 from moving, the stroke amount is too large, so that the receiving plate 605 is clamped at the corner position of the through groove 606 and the chute 607, the receiving plate 605 cannot retract, and the device is more easily damaged.
Referring to fig. 1, 2, 3, 7 and 8, the projection assembly 7 includes a projector 701 and a reflective layer 702, one end of the frame 1 is rotatably provided with the projector 701, the top of the receiving plate 605 is provided with the reflective layer 702, and after the curtain 4 is opened, the curtain 4 and the receiving plate 605 are inclined by driving the reversing assembly 6 through the reversing assembly 6 and the winding assembly 5, and the projector 701 is rotated to emit a light source, and the light source is transmitted to the curtain 4 through reflection of the reflective layer 702 and reflection of the reflective layer 702, so that imaging is completed, and the content can be projected on the basis that the reversing angle of the curtain 4 is larger than zero through the reflective effect of the reflective layer 702 and the principle of reflection of light, so that the problem that the use environment is limited is solved.
The working principle is as follows: the second screw 602 is engaged with the second screw 603 by the rotation of the working shaft of the second motor 601, and the top of the second screw 603 is fixedly connected with the receiving plate 605, and the receiving plate 605 is connected inside the through groove 606 in a sliding manner, so that the second screw 603 drives the receiving plate 605 to move horizontally, and in the moving process of the receiving plate 605, the first support arm 609 is pushed to move the limiting block 308 to slide inside the chute 607, so that the first support arm 609 is turned over, so that the first support arm 609 and the second support arm 610 perform a rotating motion, so that the second support arm 610 drives the rotating roller 2 to perform a 90-degree circumferential rotation, so that the whole winding assembly 5 is changed from a horizontal state to a vertical state, and in the turning process, the winding assembly 5 can be designed to be inclined at a certain angle according to the requirements of the use environment, thereby be favorable to the availability factor of our in daily use more, take place the screw thread through first motor 501 drive first screw rod 503 and first spiral shell piece 504 and rotate to make first spiral shell piece 504 do the rectilinear sliding in the inside of recess 502, make first spiral shell piece 504 through driving pull rod 505 to the direction motion of keeping away from storage barrel 507, thereby make pull rod 505 beat curtain 4 from the inside roll-off of storage barrel 507, so that form images.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A3D display device comprising a frame (1) of U-shaped design, characterized in that: frame (1) opening direction's one end is rotated and is installed rotor (2), and rotor (2) outside is fixed to have cup jointed installation piece (3), install on installation piece (3) and be used for realizing carrying out rolling subassembly (5) to curtain (4), frame (1) inside is provided with and is used for driving rotor (2) and carries out pivoted upset subassembly (6), be provided with on frame (1) and be used for carrying out projected projection subassembly (7) to curtain (4).
2. A 3D display device as claimed in claim 1, characterized in that: the winding assembly (5) comprises a first motor (501), a groove (502), a first screw rod (503), a first screw block (504), a pull rod (505), a fixing block (506), a containing barrel (507), a winding rod (508) and a disc spring (509), wherein the groove (502) is formed in the mounting block (3), the first motor (501) is fixedly mounted at the position, located in the groove (502), of the frame (1), the output end of the first motor (501) is fixedly connected with the first screw rod (503), the first screw rod (503) penetrates through the groove (502) to be rotatably connected with the other end of the frame (1), the first screw block (504) is sleeved on the external thread of the first screw rod (503), the first screw block (504) is connected with the inner portion of the groove (502) in a sliding mode, the fixing block (506) is fixedly mounted on the outer side of one end, far away from the first motor (501), of the mounting block (3), and be provided with storage cylinder (507) on fixed block (506), and storage cylinder (507) internal rotation is connected with winding rod (508), the equal fixedly connected with belleville spring (509) in top and the bottom of winding rod (508), and winding rod (508) pass through belleville spring (509) and storage cylinder (507) elastic connection, peg graft at the top of first spiral shell piece (504) and have pull rod (505), the outside winding of winding rod (508) has curtain (4), and the one end of curtain (4) is worn out storage cylinder (507) and pull rod (505) fixed connection.
3. A 3D display device as claimed in claim 2, characterized in that: an outlet (8) for allowing the curtain (4) to penetrate out is formed in one side of the containing barrel (507), and the projection of the outlet (8) on the plane is coincided with the projection of the groove (502) on the plane.
4. A 3D display device as claimed in claim 3, characterized in that: the top of fixed block (506) has been seted up cross recess (9), the bottom fixed mounting of storage cylinder (507) has cross piece (10), the slip grafting of storage cylinder (507) through cross piece (10) and cross recess (9) realizes being connected between fixed block (506).
5. A 3D display device as claimed in claim 1, characterized in that: the turnover component (6) comprises a second motor (601), a second screw rod (602), a second screw block (603), a bottom rod (604), a bearing plate (605), a through groove (606), a chute (607), a limiting block (308), a first supporting arm (609) and a second supporting arm (610), wherein the second motor (601) is fixedly installed at the bottom of the frame (1), the bottom rod (604) is fixedly installed inside the frame (1), the output end of the second motor (601) is fixedly connected with the second screw rod (602), the other end of the second screw rod (602) is rotatably connected with the bottom rod (604), the outer side of the second screw rod (602) is in threaded connection with the second screw block (603), the through groove (606) is formed in two sides of the frame (1), the bearing plate (605) is slidably connected inside the through groove (606), and the bottom of the bearing plate (605) is fixedly connected with the top of the second screw block (603), chute (607) that communicate with logical groove (606) are seted up to frame (1) both sides, accept board (605) and keep away from the both sides of second motor (601) one end and rotate and be connected with first support arm (609), and the stopper (308) of the inside fixedly connected with and chute (607) slip grafting of first support arm (609), the equal fixedly connected with second support arm (610) in both sides of live-rollers (2) axis of rotation, and the other end and the first support arm (609) of second support arm (610) rotate and be connected.
6. A3D display device as claimed in claim 5, characterized in that: the second motor (601) drives the second screw rod (602) to rotate, so that the length of the movement of the bearing plate (605) driven by the second screw block (603) is equal to the arc length of the rotation of the second support arm (610) by 90 degrees.
7. A3D display device as claimed in claim 6, characterized in that: the length of the through groove (606) is equal to the sum of the width of the bearing plate (605) and the length of the arc length of the second support arm (610) which rotates by 90 degrees.
8. A 3D display device as claimed in claim 7, characterized in that: the projection assembly (7) comprises a projector (701) and a reflective layer (702), the projector (701) is rotatably arranged at one end of the frame (1), and the reflective layer (702) is arranged at the top of the bearing plate (605).
CN202110833345.5A 2021-07-22 2021-07-22 3D display device Pending CN113485068A (en)

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CN202110833345.5A CN113485068A (en) 2021-07-22 2021-07-22 3D display device

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Application Number Priority Date Filing Date Title
CN202110833345.5A CN113485068A (en) 2021-07-22 2021-07-22 3D display device

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CN113485068A true CN113485068A (en) 2021-10-08

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CN206479760U (en) * 2016-12-28 2017-09-08 四川维优科技有限责任公司 Wall-mounted projection bracket
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CN209606767U (en) * 2019-04-16 2019-11-08 浙江广厦建设职业技术学院 A kind of computer projection curtain
CN209980008U (en) * 2019-07-29 2020-01-21 范东海 Portable projection curtain device
CN211293592U (en) * 2019-12-27 2020-08-18 广州维凌科技有限公司 Projection type computer display device
CN213090210U (en) * 2020-07-01 2021-04-30 广州富港万嘉智能科技有限公司 Intelligent cabinet
CN212674023U (en) * 2020-09-18 2021-03-09 洛阳洛轴工模具制造有限公司 Bearing outer diameter detection device
CN112634683A (en) * 2021-01-19 2021-04-09 河南工业贸易职业学院 Portable finance and tax big data information explanation is with projection public address set

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