CN107442194A - A kind of convenient testing stand of bedplate up-down - Google Patents
A kind of convenient testing stand of bedplate up-down Download PDFInfo
- Publication number
- CN107442194A CN107442194A CN201710441411.8A CN201710441411A CN107442194A CN 107442194 A CN107442194 A CN 107442194A CN 201710441411 A CN201710441411 A CN 201710441411A CN 107442194 A CN107442194 A CN 107442194A
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- Prior art keywords
- rotating shaft
- platen
- connecting rod
- movable block
- auxiliary body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L9/00—Supporting devices; Holding devices
- B01L9/02—Laboratory benches or tables; Fittings therefor
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- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Devices For Use In Laboratory Experiments (AREA)
Abstract
The present invention proposes a kind of convenient testing stand of bedplate up-down, including base, height adjustment mechanism, platen and locating rod；Height adjustment mechanism includes screw rod, lifting tube, rotating disc, position-limited rack and limitting casing；Base is provided with storage trough, screw rod is arranged in storage trough, lifting tube is provided with internal thread, lifting tube is connected by internal thread with screw rod, rotating disc may be rotatably mounted on position-limited rack, lifting tube upper end is connected with rotating disc, and limitting casing is moving up and down to be arranged on base, and limitting casing upper end is connected with position-limited rack；Platen may be rotatably mounted at position-limited rack top, and platen bottom is provided with the first internal thread through hole, and locating rod is provided with external screw thread, and locating rod is coordinated by external screw thread and the first internal thread through hole to be arranged on platen, and locating rod movement can lean with position-limited rack.The present invention is simple in construction, and bedplate up-down is convenient, and platen rotates conveniently.
Description
Technical field
The present invention relates to experiment auxiliary equipment, and in particular to a kind of convenient testing stand of bedplate up-down.
Background technology
The in vitro application of experimental bench is very wide, with the increasingly development of laboratory equipment, the requirement to experimental bench
More and more higher, the producer of productive experiment platform is productive profit and production efficiency, and all the experimental bench of level altitude model can be entered
Row batch production, however, itself height is different due to different users, its use habit is also not quite similar, with a batch of
The client that experimental bench is faced not necessarily can be satisfied with to the experimental bench of the height model, influence the use of user, therefore city
It is badly in need of a kind of testing stand for being easy to height to adjust on field.
The content of the invention
Based on technical problem existing for background technology, the present invention proposes a kind of convenient testing stand of bedplate up-down.
The convenient testing stand of a kind of bedplate up-down proposed by the present invention, including base, height adjustment mechanism, platen and positioning
Bar；
Height adjustment mechanism includes screw rod, lifting tube, rotating disc, position-limited rack and limitting casing；Base is provided with storage trough, spiral shell
Bar is arranged in storage trough, and lifting tube is provided with internal thread, and lifting tube is connected by internal thread with screw rod, and rotating disc is rotatably pacified
On position-limited rack, lifting tube upper end is connected with rotating disc, and limitting casing is moving up and down to be arranged on base, limitting casing upper end
It is connected with position-limited rack；
Platen may be rotatably mounted at position-limited rack top, and platen bottom is provided with the first internal thread through hole, and locating rod is provided with outer
Screw thread, locating rod is coordinated by external screw thread and the first internal thread through hole to be arranged on platen, and locating rod movement can be with position-limited rack phase
Against.
Preferably, grasping disk is installed in locating rod.
Preferably, in addition to the first elevating mechanism, the second elevating mechanism and multiple support boards；
First elevating mechanism includes movable block, first time movable block, first rotating shaft, the second rotating shaft and multiple first on first
Auxiliary body；Movable block movable bar is arranged on position-limited rack bottom on first, and movable block moving direction is by near and far on first
From the direction of screw axis, first time movable block is movably mounted on base, first time movable block moving direction to be close and
Direction away from screw axis, first rotating shaft may be rotatably mounted on base, and the second rotating shaft may be rotatably mounted at first time movement
On block；First auxiliary body includes the 3rd rotating shaft, the 4th rotating shaft, first connecting rod, second connecting rod and the 5th rotating shaft, first connecting rod and
Second connecting rod upper end connects the 3rd rotating shaft and the 4th rotating shaft respectively, and the 5th rotating shaft is rotatably connected in first connecting rod and second connecting rod
Portion；First auxiliary body from top to bottom sets gradually, and in the first adjacent auxiliary body of any two, is aided in positioned at lower section first
3rd rotating shaft of mechanism and the 4th rotating shaft be rotatably connected respectively the first auxiliary body above second connecting rod and first connect
Bar lower end, the second rotating shaft and first are connected respectively positioned at the first connecting rod of the auxiliary body of bottom first and the lower end of second connecting rod
Rotating shaft；
Second elevating mechanism includes movable block, second time movable block, the 6th rotating shaft, the 7th rotating shaft and multiple second on second
Auxiliary body；Movable block movable bar is arranged on position-limited rack bottom on second, and movable block moving direction is by near and far on second
From the direction of screw axis, second time movable block is movably mounted on base, second time movable block moving direction to be close and
Direction away from screw axis, the 6th rotating shaft may be rotatably mounted on base, and the 7th rotating shaft may be rotatably mounted at second time movement
On block；Second auxiliary body includes eighth-turn axle, the 9th rotating shaft, third connecting rod, fourth link and the tenth rotating shaft, third connecting rod and
Fourth link upper end connects eighth-turn axle and the 9th rotating shaft respectively, and the tenth rotating shaft is rotatably connected in third connecting rod and fourth link
Portion；Second auxiliary body from top to bottom sets gradually, and in the second adjacent auxiliary body of any two, is aided in positioned at lower section second
The eighth-turn axle of mechanism and the 9th rotating shaft be rotatably connected respectively the second auxiliary body above fourth link and the 3rd connect
Bar lower end, the 7th rotating shaft and the 6th are connected respectively positioned at the third connecting rod of the auxiliary body of bottom second and the lower end of fourth link
Rotating shaft；
First elevating mechanism and the second elevating mechanism are located at screw rod opposite sides, and support board and the 5th rotating shaft correspond,
Support board and the tenth rotating shaft correspond, and the both ends of support board connect the 5th rotating shaft and the tenth rotating shaft respectively, and support board includes bullet
Property connecting portion and two rigid connection portions, elastic joint part is between two rigid connection portions.
Preferably, in addition to protection mechanism, protection mechanism include location-plate, the first extension board, magnetic part and magnetic absorption
Part, the first extension board are arranged on the side of location-plate, and magnetic part is arranged on location-plate, and magnetic absorption part is arranged on position-limited rack
On, magnetic part is adsorbed in magnetic absorption part.
Preferably, platen is provided with the auxiliary neck being caught in for location-plate.
Preferably, in addition to the second extension board, platen are provided with the sliding groove for the movement of the second extension board, the second extension board
It is arranged on by sliding groove on platen, platen is provided with the second internal thread through hole, and platen, which is located at the second internal thread hole, to be provided with
Screw, screw movement can lean with the second extension board.
The present invention user need adjust platen height when, user only need rotate lifting tube, lifting tube with
Under the cooperation of screw rod, lifting tube can drive rotating disc to lift, and rotating disc can drive position-limited rack to lift, can by rotating disc lifting
Bedplate up-down is driven, and in experimentation, user can easily rotate platen to adjust the position of experimental article on platen
Put, platen and position-limited rack can be fixed together by rotational positioning bar.The present invention is simple in construction, and bedplate up-down is convenient, and
Platen rotates convenient.
Brief description of the drawings
Fig. 1 is a kind of convenient test platform structure schematic diagram of bedplate up-down proposed by the present invention.
Embodiment
Shown in reference picture 1, a kind of convenient testing stand of bedplate up-down proposed by the present invention, including base 1, height regulation machine
Structure, platen 3 and locating rod 4；
Height adjustment mechanism includes screw rod 21, lifting tube 22, rotating disc 23, position-limited rack 24 and limitting casing 25；Set on base 1
There is storage trough 11, screw rod 21 is arranged in storage trough 11, and lifting tube 22 is provided with internal thread, and lifting tube 22 passes through internal thread and spiral shell
Bar 21 is connected, and rotating disc 23 may be rotatably mounted on position-limited rack 24, and the upper end of lifting tube 22 is connected with rotating disc 23, and limitting casing 25 can
What is moved up and down is arranged on base 1, and the upper end of limitting casing 25 is connected with position-limited rack 24；
Platen 3 may be rotatably mounted at the top of position-limited rack 24, and the bottom of platen 3 is provided with the first internal thread through hole, set in locating rod 4
There is external screw thread, locating rod 4 is coordinated by external screw thread and the first internal thread through hole to be arranged on platen 3, and the movement of locating rod 4 can be with limit
Position frame 24 leans.
When user needs to adjust the height of platen 3, user only needs to rotate lifting tube 22 present invention, in lifting tube
22 with the cooperation of screw rod 21, lifting tube 22 can drive rotating disc 23 to lift, and rotating disc 23 can drive position-limited rack 24 to lift, and pass through
The lifting of rotating disc 23 can drive platen 3 to lift, and in experimentation, user can easily rotate platen 3 to adjust
The position of experimental article on platen, platen 3 and position-limited rack 24 can be fixed together by rotational positioning bar 4.
In present embodiment, it is provided with locating rod 4 and grasps disk 41, can easily rotated by grasping the user of disk 41
Locating rod 4.
In present embodiment, in addition to the first elevating mechanism, the second elevating mechanism and multiple support boards；
First elevating mechanism includes movable block 51, first time movable block 52, first rotating shaft 53, the and of the second rotating shaft 54 on first
Multiple first auxiliary bodies；The movable bar of movable block 51 is arranged on the bottom of position-limited rack 24 on first, and movable block 51 moves on first
Direction is direction close and away from the axis of screw rod 21, and first time movable block 52 is movably mounted on base 1, first time movement
The moving direction of block 52 is direction close and away from the axis of screw rod 21, and first rotating shaft 53 may be rotatably mounted on base 1, second turn
Axle 54 may be rotatably mounted on first time movable block 52；First auxiliary body includes the 3rd rotating shaft 551, the 4th rotating shaft 552, first
Connecting rod 553, the rotating shaft 555 of second connecting rod 554 and the 5th, first connecting rod 553 and the upper end of second connecting rod 554 connect the 3rd rotating shaft respectively
551 and the 4th rotating shaft 552, the 5th rotating shaft 555 is rotatably connected first connecting rod 553 and the middle part of second connecting rod 554；First auxiliary machine
Structure is from top to bottom set gradually, in the first adjacent auxiliary body of any two, positioned at the 3rd turn of the auxiliary body of lower section first
The rotating shaft 552 of axle 551 and the 4th is rotatably connected the second connecting rod 554 and first connecting rod of the first auxiliary body above respectively
553 lower ends, second turn is connected respectively positioned at the first connecting rod 553 of the auxiliary body of bottom first and the lower end of second connecting rod 554
Axle 54 and first rotating shaft 53；
Second elevating mechanism includes movable block 61, second time movable block 62, the 6th rotating shaft 63, the and of the 7th rotating shaft 64 on second
Multiple second auxiliary bodies 65；The movable bar of movable block 61 is arranged on the bottom of position-limited rack 24 on second, and movable block 61 moves on second
Dynamic direction is direction close and away from the axis of screw rod 21, and second time movable block 62 is movably mounted on base 1, and second moves down
The moving direction of motion block 62 is direction close and away from the axis of screw rod 21, and the 6th rotating shaft 63 may be rotatably mounted on base 1, the 7th
Rotating shaft 64 may be rotatably mounted on second time movable block 62；Second auxiliary body 65 include eighth-turn axle 651, the 9th rotating shaft 652,
Third connecting rod 653, the rotating shaft 656 of fourth link 654 and the tenth, third connecting rod 653 and the upper end of fourth link 654 connect the 8th respectively
The rotating shaft 652 of rotating shaft 651 and the 9th, the tenth rotating shaft 656 are rotatably connected in the middle part of third connecting rod 653 and fourth link 654；Second is auxiliary
Mechanism 65 is helped from top to bottom to set gradually, in the second adjacent auxiliary body of any two, positioned at the second auxiliary body of lower section 65
The rotating shaft 652 of eighth-turn axle 651 and the 9th be rotatably connected respectively the He of fourth link 654 of the second auxiliary body 65 above
The lower end of third connecting rod 653, positioned at the third connecting rod 653 of the second auxiliary body of bottom 65 and the lower end difference of fourth link 654
Connect the 7th rotating shaft 64 and the 6th rotating shaft 63；
First elevating mechanism and the second elevating mechanism are located at the opposite sides of screw rod 21, and support board and the 5th rotating shaft 555 are one by one
Corresponding, support board corresponds with the tenth rotating shaft 656, and the both ends of support board connect the 5th rotating shaft 555 and the tenth rotating shaft respectively
656, support board includes elastic joint part 71 and two rigid connection portions 72, and elastic joint part 71 is located at two rigid connection portions 72
Between.
User can be placed items within support board, and the first elevating mechanism and the second elevating mechanism can be with spacing
The lifting of frame 24 and deform upon, as the distance between deformation difference support board of position-limited rack 24 can change automatically, have
Effect utilizes the memory space inside the present invention.
In present embodiment, in addition to protection mechanism, protection mechanism include location-plate 81, the first extension board 82, magnetic part
83 and magnetic absorption part 84, the first extension board 82 is arranged on the side of location-plate 81, and magnetic part 83 is arranged on location-plate 81, magnetic
Property adsorption piece 84 be arranged on position-limited rack 24 on, magnetic part 83 is adsorbed in magnetic absorption part 84, when magnetic absorption part 84 and magnetic
When part 83 is attached together, the first extension board 82 can prevent that object drops on platen in the side of platen 3, and platen 3, which is provided with, to be supplied
The auxiliary neck 31 that location-plate 81 is caught in, location-plate 81 is inserted into auxiliary neck 31, this can be increased by the first extension board 82
Distribute bright experimental operation space.
In present embodiment, in addition to the second extension board 9, platen 3 are provided with the sliding groove for the movement of the second extension board 9
32, the second extension board 9 is arranged on platen 3 by sliding groove 32, and platen 3 is provided with the second internal thread through hole, and platen 3 is located at the
Screw 33 is installed, the movement of screw 33 can lean with the second extension board 9, regulate the second extension board 9 at two internal thread holes
Position, then the second extension board 9 is fixed on to the experimental implementation sky that the present invention can be further adjusted on platen 3 by screw 33
Between.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (6)
- A kind of 1. convenient testing stand of bedplate up-down, it is characterised in that：Including base (1), height adjustment mechanism, platen (3) and Locating rod (4)；Height adjustment mechanism includes screw rod (21), lifting tube (22), rotating disc (23), position-limited rack (24) and limitting casing (25)；Bottom Seat (1) is provided with storage trough (11), and screw rod (21) is arranged in storage trough (11), and lifting tube (22) is provided with internal thread, lifting Cylinder (22) is connected by internal thread with screw rod (21), and rotating disc (23) may be rotatably mounted on position-limited rack (24), lifting tube (22) Upper end is connected with rotating disc (23), and limitting casing (25) is moving up and down to be arranged on base (1), limitting casing (25) upper end and limit Position frame (24) connection；Platen (3) may be rotatably mounted at position-limited rack (24) top, and platen (3) bottom is provided with the first internal thread through hole, locating rod (4) External screw thread is provided with, locating rod (4) is coordinated by external screw thread and the first internal thread through hole to be arranged on platen (3), locating rod (4) Movement can lean with position-limited rack (24).
- 2. the convenient testing stand of bedplate up-down according to claim 1, it is characterised in that：It is provided with and grabs in locating rod (4) Large face machine (41).
- 3. the convenient testing stand of bedplate up-down according to claim 1, it is characterised in that：Also include the first elevating mechanism, Second elevating mechanism and multiple support boards；First elevating mechanism includes movable block (51), first time movable block (52), first rotating shaft (53), the second rotating shaft on first And multiple first auxiliary bodies (54)；Movable block (51) movable bar is arranged on position-limited rack (24) bottom on first, and first moves up Motion block (51) moving direction is direction close and away from screw rod (21) axis, and first time movable block (52) is movably mounted to bottom On seat (1), first time movable block (52) moving direction is direction close and away from screw rod (21) axis, and first rotating shaft (53) can It is rotatably installed on base (1), the second rotating shaft (54) may be rotatably mounted on first time movable block (52)；First auxiliary body wraps Include the 3rd rotating shaft (551), the 4th rotating shaft (552), first connecting rod (553), second connecting rod (554) and the 5th rotating shaft (555), first Connecting rod (553) and second connecting rod (554) upper end connect the 3rd rotating shaft (551) and the 4th rotating shaft (552), the 5th rotating shaft respectively (555) it is rotatably connected in the middle part of first connecting rod (553) and second connecting rod (554)；First auxiliary body from top to bottom sets gradually, In the first adjacent auxiliary body of any two, the 3rd rotating shaft (551) and the 4th rotating shaft positioned at the auxiliary body of lower section first (552) be rotatably connected respectively the first auxiliary body above second connecting rod (554) and first connecting rod (553) lower end, position The second rotating shaft (54) is connected respectively in the first connecting rod (553) of the auxiliary body of bottom first and the lower end of second connecting rod (554) With first rotating shaft (53)；Second elevating mechanism includes movable block (61), second time movable block (62), the 6th rotating shaft (63), the 7th rotating shaft on second And multiple second auxiliary bodies (65) (64)；Movable block (61) movable bar is arranged on position-limited rack (24) bottom on second, and second Upper movable block (61) moving direction be close to and away from screw rod (21) axis direction, second time movable block (62) removable installation On base (1), second time movable block (62) moving direction is the 6th rotating shaft close to and away from the direction of screw rod (21) axis (63) may be rotatably mounted on base (1), the 7th rotating shaft (64) may be rotatably mounted on second time movable block (62)；Second auxiliary Mechanism (65) includes eighth-turn axle (651), the 9th rotating shaft (652), third connecting rod (653), fourth link (654) and the tenth rotating shaft (656), third connecting rod (653) and fourth link (654) upper end connect eighth-turn axle (651) and the 9th rotating shaft (652) respectively, the Ten rotating shafts (656) are rotatably connected in the middle part of third connecting rod (653) and fourth link (654)；Second auxiliary body (65) is by up to Under set gradually, in the second adjacent auxiliary body of any two, positioned at the eighth-turn axle of the auxiliary body of lower section second (65) (651) it is rotatably connected respectively the fourth link (654) and of the second auxiliary body (65) above with the 9th rotating shaft (652) Three connecting rods (653) lower end, under the third connecting rod (653) and fourth link (654) of the auxiliary body of bottom second (65) End connects the 7th rotating shaft (64) and the 6th rotating shaft (63) respectively；First elevating mechanism and the second elevating mechanism are located at screw rod (21) opposite sides, and support board and the 5th rotating shaft (555) are one by one Corresponding, support board and the tenth rotating shaft (656) correspond, and the both ends of support board connect the 5th rotating shaft (555) and the tenth turn respectively Axle (656), support board include elastic joint part (71) and two rigid connection portions (72), and elastic joint part (71) is hard positioned at two Between property connecting portion (72).
- 4. the convenient testing stand of bedplate up-down according to claim 1, it is characterised in that：Also include protection mechanism, protect Mechanism includes location-plate (81), the first extension board (82), magnetic part (83) and magnetic absorption part (84), the first extension board (82) peace Mounted in the side of location-plate (81), magnetic part (83) is arranged on location-plate (81), and magnetic absorption part (84) is arranged on position-limited rack (24) on, magnetic part (83) is adsorbed in magnetic absorption part (84).
- 5. the convenient testing stand of bedplate up-down according to claim 4, it is characterised in that：Platen (3) is provided with for positioning The auxiliary neck (31) that plate (81) is caught in.
- 6. the convenient testing stand of bedplate up-down according to claim 1, it is characterised in that：Also include the second extension board (9), Platen (3) is provided with to be installed for the mobile sliding groove (32) of the second extension board (9), the second extension board (9) by sliding groove (32) On platen (3), platen (3) is provided with the second internal thread through hole, and platen (3), which is located at the second internal thread hole, is provided with screw (33), screw (33) movement can lean with the second extension board (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710441411.8A CN107442194B (en) | 2017-06-13 | 2017-06-13 | Test bench with conveniently lifted bedplate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710441411.8A CN107442194B (en) | 2017-06-13 | 2017-06-13 | Test bench with conveniently lifted bedplate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107442194A true CN107442194A (en) | 2017-12-08 |
| CN107442194B CN107442194B (en) | 2020-10-13 |
Family
ID=60486552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710441411.8A Active CN107442194B (en) | 2017-06-13 | 2017-06-13 | Test bench with conveniently lifted bedplate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107442194B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365027A (en) * | 2018-12-26 | 2019-02-22 | 潍坊科技学院 | A kind of fire safe physical experiment table |
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| CN202781106U (en) * | 2012-07-12 | 2013-03-13 | 浙江吉润汽车有限公司 | Height-adjustable working platform |
| CN103861679A (en) * | 2014-03-12 | 2014-06-18 | 亿丰洁净科技江苏股份有限公司 | Test bed with protection function |
| CN203816677U (en) * | 2014-03-20 | 2014-09-10 | 河海大学 | Movable hoisting experiment table with variable tabletop |
| CN204485909U (en) * | 2015-02-27 | 2015-07-22 | 山东博科生物产业有限公司 | A kind of foot-control type lifting experimental bench |
| CN205361424U (en) * | 2016-02-20 | 2016-07-06 | 崔一诺 | Multifunctional chemical teaching experiment table |
| CN105866938A (en) * | 2016-06-07 | 2016-08-17 | 北京寺库商贸有限公司 | Movable type object bearing platform and movable type microscope |
| CN206046094U (en) * | 2016-09-09 | 2017-03-29 | 华东交通大学 | A kind of use for laboratory teaching test stand |
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2017
- 2017-06-13 CN CN201710441411.8A patent/CN107442194B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU897278A1 (en) * | 1979-08-17 | 1982-01-15 | Ордена Трудового Красного Знамени Институт Тепло-И Массообмена Им.А.В.Лыкова Ан Бсср | Controllable-height table |
| CN202781106U (en) * | 2012-07-12 | 2013-03-13 | 浙江吉润汽车有限公司 | Height-adjustable working platform |
| CN103861679A (en) * | 2014-03-12 | 2014-06-18 | 亿丰洁净科技江苏股份有限公司 | Test bed with protection function |
| CN203816677U (en) * | 2014-03-20 | 2014-09-10 | 河海大学 | Movable hoisting experiment table with variable tabletop |
| CN204485909U (en) * | 2015-02-27 | 2015-07-22 | 山东博科生物产业有限公司 | A kind of foot-control type lifting experimental bench |
| CN205361424U (en) * | 2016-02-20 | 2016-07-06 | 崔一诺 | Multifunctional chemical teaching experiment table |
| CN105866938A (en) * | 2016-06-07 | 2016-08-17 | 北京寺库商贸有限公司 | Movable type object bearing platform and movable type microscope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365027A (en) * | 2018-12-26 | 2019-02-22 | 潍坊科技学院 | A kind of fire safe physical experiment table |
| CN109365027B (en) * | 2018-12-26 | 2021-03-16 | 潍坊科技学院 | Fireproof safety type physical experiment table |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107442194B (en) | 2020-10-13 |
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