CN206400857U - Teaching platform is used in a kind of wire harness assembling - Google Patents
Teaching platform is used in a kind of wire harness assembling Download PDFInfo
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- CN206400857U CN206400857U CN201621395176.2U CN201621395176U CN206400857U CN 206400857 U CN206400857 U CN 206400857U CN 201621395176 U CN201621395176 U CN 201621395176U CN 206400857 U CN206400857 U CN 206400857U
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- plate
- drawstring
- slide rail
- wire harness
- transverse slat
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Abstract
The utility model is related to a kind of wire harness assembling workbench, more particularly to teaching platform is used in a kind of assembling of wire harness.The technical problems to be solved in the utility model, which is to provide one kind, can adjust height, it is possible to increase the learning efficiency of workman, can shorten the wire harness assembling teaching platform of the learning time of workman.In order to solve the above-mentioned technical problem, the utility model provides the assembling of such a wire harness and uses teaching platform, includes bottom plate, left plate, right plate, the first slide rail, sliding block, fixed plate, T-shaped screw rod, the second slide rail, transverse slat, ball, back side panel, operating desk etc.;The left and right sides at the top of bottom plate is connected with left plate and right plate vertically by way of being welded to connect.The utility model has been reached by using electronic reel and wire spool withdrawal with the first drawstring of releasing and the second drawstring to the height progress lift adjustment of operating desk can adjust height, it is possible to increase the learning efficiency of workman.
Description
Technical field
The utility model is related to a kind of wire harness assembling workbench, more particularly to teaching platform is used in a kind of assembling of wire harness.
Background technology
Wire harness assembling is bunchiness electric wire, the sum total of cable of transmission information.
Having just enter into the workman of wire harness assembling factory typically will not also carry out wire harness assembling, it is necessary to carry out wire harness assembling religion to it
Learn, universal at present that workman's progress wire harness assembling is imparted knowledge to students before teaching platform, existing teaching platform generally simply works
Pedestal adds the simple modular structure of work top, general to play a part of to place wire harness, and the height of each workman is had nothing in common with each other, and is taught
Learn workbench it is too high and it is too low can all influence the study of workman, so that the learning efficiency of workman can be reduced, workman can be lengthened
The habit time, thus need badly research and development one kind can adjust height, it is possible to increase the learning efficiency of workman, the study of workman can be shortened
Teaching platform is used in the wire harness assembling of time.
Utility model content
(1)The technical problem to be solved
The utility model is in order to overcome the letter that existing wire harness teaching platform is generally table rest plus work top
Single combining structure, it is general to play a part of to place wire harness, and the height of each workman is had nothing in common with each other, teaching platform is too high and too low
The study of workman will be influenceed, so that the learning efficiency of workman can be reduced, the shortcoming of the learning time of workman, this practicality can be lengthened
The new technical problem to be solved, which is to provide one kind, can adjust height, it is possible to increase the learning efficiency of workman, can shorten work
Teaching platform is used in the wire harness assembling of the learning time of people.
(2)Technical scheme
In order to solve the above-mentioned technical problem, the utility model provides the assembling of such a wire harness and uses teaching platform, wraps
Bottom plate, left plate, right plate, the first slide rail, sliding block, fixed plate, T-shaped screw rod, the second slide rail, transverse slat, ball, rear side are included
Plate, operating desk, the first spring, top plate, electronic reel, wire spool, the first fixed pulley, the second fixed pulley, the first drawstring and
The left and right sides at the top of two drawstrings, bottom plate is connected with left plate and right plate vertically by way of being welded to connect, left plate and
The leading flank of right plate is provided with multiple first screwed holes, and the first screwed hole is uniformly distributed, the right flank and right plate of left plate
Left surface be connected with the first slide rail vertically by way of being welded to connect, the first slide rail is provided with the sliding block coordinated with it,
Sliding block is slidably matched with the first slide rail, and the leading flank of two sliding blocks is connected with fixed plate by way of being welded to connect, and left side is solid
The left side of fixed board and the right side of right side fixed plate are provided with the second screwed hole, the second screwed hole provided with the T-shaped spiral shell coordinated with it
The second slide rail is connected between bar, two sliding blocks by way of being welded to connect, the second slide rail is provided with transverse slat, the bottom of transverse slat
Provided with ball, ball is contacted with the second slide rail, and opening is provided with the middle part of transverse slat, and the top of transverse slat is provided with groove, the second slide rail
Rear side is connected with the middle part of back side panel, the leading flank of back side panel the water by way of being welded to connect vertically by way of being welded to connect
Flushconnection has an operating desk, operating desk through opening and positioned at the front side of transverse slat, the leading flank of back side panel and the trailing flank of transverse slat it
Between the first spring is connected with by way of being welded to connect, between left plate and the top of right plate by way of being welded to connect
Top plate is connected with, the mode that the centre of top plate bottom is bolted is provided with electronic reel, the front side of electronic reel
The mode being bolted is connected with the mode being bolted at the top of wire spool, left plate right flank and is provided with first
The mode being bolted at the top of fixed pulley, right plate left surface is provided with the second fixed pulley, and wire spool is provided with first
Drawstring, the head end of the first drawstring is wound on wire spool, and the first drawstring bypasses the first fixed pulley, and the end of the first drawstring is connected to a left side
The top of side slide, electronic reel is provided with the second drawstring, and the head end of the second drawstring is wound on electronic reel, the second drawstring
The second fixed pulley is bypassed, the end of the second drawstring is connected to the top of right side sliding block.
Preferably, pedal, second spring and contact-making switch are also included, bottom plate top left side is provided with contact-making switch, connect
Touching has connection between switch and electronic reel, contact-making switch, which is located at directly over the right side of left plate, contact-making switch, to be set
There is pedal, second spring is connected with by way of being welded to connect between the bottom of pedal and the top of bottom plate.
Preferably, lid is also included, the top of lid trailing flank is provided with lid.
Preferably, the first drawstring and the second drawstring are steel wire rope.
Preferably, the making material of top plate is Q235 steel.
Preferably, the second screwed hole and the first screwed hole is in the same size.
Operation principle:When workman will carry out wire harness assembling study, first stand in the front side of operating desk.When initial, operating desk
Middle part between bottom plate and top plate.When the higher height for feeling operating desk of height of workman is relatively low, first unscrew T-shaped screw rod simultaneously
It is unloaded out of second screwed hole.Restart electronic reel to rotate clockwise, electronic reel is rotated clockwise second
Drawstring is withdrawn, and electronic reel rotates clockwise wire spool and rotated clockwise therewith, and wire spool is rotated clockwise the first drawstring
Withdraw.First drawstring and the second drawstring are withdrawn simultaneously moves up the sliding block in left side and right side, and sliding block moves up the second cunning
Rail is moved up therewith, and the second slide rail moves up transverse slat, back side panel and operating desk and moved up therewith.When operating desk is to moving up
When moving to proper height, electronic reel is closed.Then the second screwed hole is directed at the first screwed hole, then T-shaped screw rod is put back to
Second screwed hole is interior and is tightened.When the shorter height for feeling operating desk of height of workman is higher, first unscrews T-shaped screw rod and incite somebody to action
It is unloaded out of second screwed hole.Restart electronic reel to rotate counterclockwise, electronic reel is rotated counterclockwise to be drawn second
Rope is released, and electronic reel rotates counterclockwise wire spool and rotated counterclockwise therewith, and wire spool, which is rotated counterclockwise, puts the first drawstring
Go out.First drawstring and the second drawstring are released simultaneously moves down the sliding block in left side and right side, and sliding block moves down the second slide rail
Move down therewith, the second slide rail moves down transverse slat, back side panel and operating desk and moved down therewith.When operating desk is moved down
During to proper height, electronic reel is closed.Then the second screwed hole is directed at the first screwed hole, then T-shaped screw rod is put back to the
Two screwed holes are interior and tightened, and can so adjust the height of operating desk.Groove on transverse slat can place wire harness assembling
The schooling apparatus such as wire harness, pliers, the contiguous block commonly used, when initial, transverse slat is located at the rear side of the second slide rail.When in groove to be taken
Schooling apparatus when, being pulled along transverse slat makes ball forward slip on the second slide rail, and ball forward slip transverse slat is therewith forward
Mobile, transverse slat moves forward the first spring and upheld, and transverse slat is stopped drag when transverse slat moves forward to correct position and by needed for
Schooling apparatus takes out out of groove.Then transverse slat is promoted to reset it backward again, transverse slat resets the first spring-compressed.So can
The schooling apparatus in groove is conveniently taken, also larger operating space can be reserved simultaneously.Therefore the utility model can be adjusted
Highly, it is possible to increase the learning efficiency of workman, the learning time of workman can be shortened.
Because also including pedal, second spring and contact-making switch, bottom plate top left side be provided with contact-making switch, contact
There is connection between switch and electronic reel, contact-making switch is located at the right side of left plate, and the surface of contact-making switch is provided with
Pedal, second spring is connected between the bottom of pedal and the top of bottom plate by way of being welded to connect.Step on foot-operated
Plate moves down it and contacts contact-making switch, can start electronic reel, and pedal moves down second spring compression, so
Unclamp pedal second spring afterwards to uphold, second spring is upheld pedal and resetted therewith, then manually closes electronic reel.
Because also including lid, the top of lid trailing flank is provided with lid, and lid can prevent dust from entering groove, from
And schooling apparatus laying dust can be prevented.
Because the first drawstring and the second drawstring are steel wire rope, the intensity of steel wire rope is high, from heavy and light, stable working, be difficult
Suddenly whole root fracture, safe and reliable.
Because the making material of top plate is Q235 steel, the ability to bear of Q235 steel is big, can extend the service life of top plate.
(3)Beneficial effect
The utility model is withdrawn with releasing the first drawstring and the second drawstring to behaviour by using electronic reel and wire spool
Make platform height carry out lift adjustment reached can adjust height, it is possible to increase the learning efficiency of workman, workman can be shortened
Learning time effect.
Brief description of the drawings
Fig. 1 is the first main structure diagram of the present utility model.
Fig. 2 is the first left view structural representation of the utility model transverse slat.
Fig. 3 is second of main structure diagram of the present utility model.
Fig. 4 is second of left view structural representation of the utility model transverse slat.
Mark in accompanying drawing for:1- bottom plates, 2- left plates, 3- right plates, the screwed holes of 4- first, the slide rails of 5- first, 6- is slided
Block, 7- fixed plates, the screwed holes of 8- second, 9-T shape screw rods, the slide rails of 10- second, 11- transverse slats, 12- openings, 13- grooves, 14- rollings
Pearl, 15- back side panels, 16- operating desks, the springs of 17- first, 18- top plates, the electronic reels of 19-, 20- wire spools, 21- first determines
Pulley, the fixed pulleys of 22- second, the drawstrings of 23- first, the drawstrings of 24- second, 25- pedals, 26- second springs, 27- contact-making switches,
28- lids.
Embodiment
The utility model is further described with reference to the accompanying drawings and examples.
Embodiment 1
Teaching platform is used in a kind of wire harness assembling, as Figure 1-4, includes bottom plate 1, left plate 2, right plate 3, first
Slide rail 5, sliding block 6, fixed plate 7, T-shaped screw rod 9, the second slide rail 10, transverse slat 11, ball 14, back side panel 15, operating desk 16, first
Spring 17, top plate 18, electronic reel 19, wire spool 20, the first fixed pulley 21, the second fixed pulley 22, the first drawstring 23 and
Two drawstrings 24, the left and right sides at the top of bottom plate 1 is connected with left plate 2 and right plate 3, left side vertically by way of being welded to connect
The leading flank of plate 2 and right plate 3 is provided with multiple first screwed holes 4, and the first screwed hole 4 is uniformly distributed, the right flank of left plate 2
The first slide rail 5 is connected with vertically by way of being welded to connect with the left surface of right plate 3, and the first slide rail 5 is provided with and it
The sliding block 6 of cooperation, sliding block 6 is slidably matched with the first slide rail 5, and the leading flank of two sliding blocks 6 is connected by way of being welded to connect
There is fixed plate 7, the left side of left side fixed plate 7 and the right side of right side fixed plate 7 are provided with the second screwed hole 8, the second screwed hole 8
Provided with the T-shaped screw rod 9 coordinated with it, the second slide rail 10 is connected between two sliding blocks 6 by way of being welded to connect, second slides
Rail 10 is provided with transverse slat 11, and the bottom of transverse slat 11 is provided with ball 14, and ball 14 is contacted with the second slide rail 10, and the middle part of transverse slat 11 is opened
There is opening 12, the top of transverse slat 11 is provided with groove 13, and the rear side of the second slide rail 10 is connected with vertically by way of being welded to connect
Level connection joint has operating desk 16 by way of being welded to connect in the middle part of back side panel 15, the leading flank of back side panel 15, and operating desk 16 is worn
Opening 12 is crossed and positioned at the front side of transverse slat 11, by being welded to connect between the leading flank of back side panel 15 and the trailing flank of transverse slat 11
Mode is connected with the first spring 17, and top plate is connected with by way of being welded to connect between left plate 2 and the top of right plate 3
18, the mode that the centre of the bottom of top plate 18 is bolted is provided with electronic reel 19, and the front side of electronic reel 19 leads to
Cross bolted mode and be connected with the mode being bolted at the top of wire spool 20, the right flank of left plate 2 and be provided with
The mode being bolted at the top of one fixed pulley 21, the left surface of right plate 3 is provided with the second fixed pulley 22, wire spool 20
Provided with the first drawstring 23, the head end of the first drawstring 23 is wound on wire spool 20, and the first drawstring 23 bypasses the first fixed pulley 21, first
The end of drawstring 23 is connected to the top of left slider 6, and electronic reel 19 is provided with the second drawstring 24, the head of the second drawstring 24
End is wound on electronic reel 19, and the second drawstring 24 bypasses the second fixed pulley 22, and the end of the second drawstring 24 is connected to right side and slided
The top of block 6.
Also include pedal 25, second spring 26 and contact-making switch 27, the top left side of bottom plate 1 is provided with contact-making switch 27,
There is connection between contact-making switch 27 and electronic reel 19, contact-making switch 27 is located at the right side of left plate 2, contact-making switch 27
Surface be provided with pedal 25, be connected between the bottom of pedal 25 and the top of bottom plate 1 by way of being welded to connect
Second spring 26.
Also include lid 28, the top of the trailing flank of lid 28 is provided with lid 28.
First drawstring 23 and the second drawstring 24 are steel wire rope.
The making material of top plate 18 is Q235 steel.
Second screwed hole 8 is in the same size with the first screwed hole 4.
Operation principle:When workman will carry out wire harness assembling study, first stand in the front side of operating desk 16.When initial, operation
Platform 16 is located at the middle part between bottom plate 1 and top plate 18.When the higher height for feeling operating desk 16 of height of workman is relatively low, first unscrew
T-shaped screw rod 9 simultaneously unloads it out of second screwed hole 8.Restart electronic reel 19 to rotate clockwise, electronic reel 19 is suitable
Hour hands rotate and withdraw the second drawstring 24, and electronic reel 19 rotates clockwise wire spool 20 and rotated clockwise therewith, wire spool
20 rotate clockwise and withdraw the first drawstring 23.First drawstring 23 and the second drawstring 24 are withdrawn simultaneously makes the sliding block in left side and right side
6 move up, and sliding block 6 moves up the second slide rail 10 and moved up therewith, and the second slide rail 10 moves up transverse slat 11, back side panel
15 and operating desk 16 move up therewith.When operating desk 16 is moved upward to proper height, electronic reel 19 is closed.Then
The second screwed hole 8 is directed at the first screwed hole 4, then T-shaped screw rod 9 is put back in the second screwed hole 8 and tightened.The body of workman
When the height of high shorter sensation operating desk 16 is higher, first unscrews T-shaped screw rod 9 and unload it out of second screwed hole 8.Restart
Electronic reel 19 is rotated counterclockwise, and electronic reel 19, which is rotated counterclockwise, releases the second drawstring 24, and electronic reel 19 is inverse
Hour hands rotate wire spool 20 and rotated counterclockwise therewith, and wire spool 20, which is rotated counterclockwise, releases the first drawstring 23.First drawstring 23
Being released simultaneously with the second drawstring 24 moves down the sliding block 6 in left side and right side, sliding block 6 move down the second slide rail 10 therewith to
Lower movement, the second slide rail 10 moves down transverse slat 11, back side panel 15 and operating desk 16 and moved down therewith.When operating desk 16 is downward
When being moved to proper height, electronic reel 19 is closed.Then the second screwed hole 8 is made to be directed at the first screwed hole 4, then by T-shaped spiral shell
Bar 9 is put back in the second screwed hole 8 and tightened, and can so adjust the height of operating desk 16.Groove 13 on transverse slat 11 can
The schooling apparatus such as wire harness, pliers, contiguous block to place wire harness assembling study, when initial, transverse slat 11 is located at the second slide rail 10
Rear side.When the schooling apparatus in groove 13 to be taken, be pulled along transverse slat 11 make ball 14 on the second slide rail 10 forward
Slide, the forward slip transverse slat 11 of ball 14 moves forward therewith, transverse slat 11 moves forward the first spring 17 and upheld, when transverse slat 11 to
Before transverse slat 11 stopped drag when being moved to correct position and take out required schooling apparatus out of groove 13.Then promote backward again
Transverse slat 11 resets it, and transverse slat 11 resets the first spring 17 and compressed.The schooling apparatus in groove 13 so can be conveniently taken, also
Larger operating space can be reserved simultaneously.Therefore the utility model can adjust height, it is possible to increase the learning efficiency of workman,
The learning time of workman can be shortened.
Because also include pedal 25, second spring 26 and contact-making switch 27, the top left side of bottom plate 1 is opened provided with contact
27 are closed, there is connection between contact-making switch 27 and electronic reel 19, contact-making switch 27 is located at the right side of left plate 2, contact
The surface of switch 27 is provided with pedal 25, between the bottom of pedal 25 and the top of bottom plate 1 by way of being welded to connect
It is connected with second spring 26.Stepping on pedal 25 moves down it and contacts contact-making switch 27, can start electronic reel
19, pedal 25 moves down second spring 26 and compressed, and then unclamps the second spring 26 of pedal 25 and upholds, second spring 26 is stretched
Open pedal 25 to reset therewith, then manually close electronic reel 19.
Because also including lid 28, the top of the trailing flank of lid 28 is provided with lid 28, and lid 28 can prevent dust from entering
Enter groove 13, so as to prevent schooling apparatus laying dust.
Because the first drawstring 23 and the second drawstring 24 are steel wire rope, the intensity of steel wire rope is high, from heavy and light, stable working,
Whole root fracture suddenly is difficult, it is safe and reliable.
Because the making material of top plate 18 is Q235 steel, the ability to bear of Q235 steel is big, can extend the use of top plate 18
The time limit.
Embodiment described above only expresses preferred embodiment of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the common of this area
For technical staff, without departing from the inventive concept of the premise, some deformations can also be made, improves and substitutes, these are all
Belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (6)
1. teaching platform is used in a kind of wire harness assembling, it is characterised in that include bottom plate(1), left plate(2), right plate(3)、
First slide rail(5), sliding block(6), fixed plate(7), T-shaped screw rod(9), the second slide rail(10), transverse slat(11), ball(14), rear side
Plate(15), operating desk(16), the first spring(17), top plate(18), electronic reel(19), wire spool(20), the first fixed pulley
(21), the second fixed pulley(22), the first drawstring(23)With the second drawstring(24), bottom plate(1)The left and right sides at top passes through welding
The mode of connection is connected with left plate vertically(2)And right plate(3), left plate(2)And right plate(3)Leading flank be provided with it is many
Individual first screwed hole(4), the first screwed hole(4)It is uniformly distributed, left plate(2)Right flank and right plate(3)Left surface it is equal
It is connected with the first slide rail vertically by way of being welded to connect(5), the first slide rail(5)Provided with the sliding block coordinated with it(6), it is sliding
Block(6)With the first slide rail(5)It is slidably matched, two sliding blocks(6)Leading flank fixed plate is connected with by way of being welded to connect
(7), left side fixed plate(7)Left side and right side fixed plate(7)Right side be provided with the second screwed hole(8), the second screwed hole(8)
It is interior provided with the T-shaped screw rod coordinated with it(9), two sliding blocks(6)Between the second slide rail is connected with by way of being welded to connect
(10), the second slide rail(10)It is provided with transverse slat(11), transverse slat(11)Bottom be provided with ball(14), ball(14)With the second slide rail
(10)Contact, transverse slat(11)Middle part be provided with opening(12), transverse slat(11)Top be provided with groove(13), the second slide rail(10)'s
Rear side is connected with back side panel vertically by way of being welded to connect(15), back side panel(15)Leading flank in the middle part of by being welded to connect
Mode level connection joint have operating desk(16), operating desk(16)Through opening(12)And positioned at transverse slat(11)Front side, back side panel
(15)Leading flank and transverse slat(11)Trailing flank between the first spring is connected with by way of being welded to connect(17), left plate
(2)And right plate(3)Top between top plate is connected with by way of being welded to connect(18), top plate(18)The centre of bottom leads to
Cross bolted mode and electronic reel is installed(19), electronic reel(19)The mode that is bolted of front side connect
It is connected to wire spool(20), left plate(2)The mode being bolted at the top of right flank is provided with the first fixed pulley(21), it is right
Side plate(3)The mode being bolted at the top of left surface is provided with the second fixed pulley(22), wire spool(20)Provided with the
One drawstring(23), the first drawstring(23)Head end be wound on wire spool(20)On, the first drawstring(23)Bypass the first fixed pulley(21),
First drawstring(23)End be connected to left slider(6)Top, electronic reel(19)It is provided with the second drawstring(24), the
Two drawstrings(24)Head end be wound on electronic reel(19)On, the second drawstring(24)Bypass the second fixed pulley(22), the second drawstring
(24)End be connected to right side sliding block(6)Top.
2. teaching platform is used in a kind of wire harness assembling according to claim 1, it is characterised in that also include pedal
(25), second spring(26)And contact-making switch(27), bottom plate(1)Top left side is provided with contact-making switch(27), contact-making switch(27)
With electronic reel(19)Between have connection, contact-making switch(27)Positioned at left plate(2)Right side, contact-making switch(27)'s
Surface is provided with pedal(25), pedal(25)Bottom and bottom plate(1)Top between connected by way of being welded to connect
It is connected to second spring(26).
3. teaching platform is used in a kind of wire harness assembling according to claim 1, it is characterised in that also include lid
(28), lid(28)The top of trailing flank is provided with lid(28).
4. teaching platform is used in a kind of wire harness assembling according to claim 1, it is characterised in that the first drawstring(23)With
Two drawstrings(24)It is steel wire rope.
5. teaching platform is used in a kind of wire harness assembling according to claim 1, it is characterised in that top plate(18)Making material
Expect for Q235 steel.
6. teaching platform is used in a kind of wire harness assembling according to claim 1, it is characterised in that the second screwed hole(8)With
First screwed hole(4)It is in the same size.
Priority Applications (1)
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CN201621395176.2U CN206400857U (en) | 2016-12-19 | 2016-12-19 | Teaching platform is used in a kind of wire harness assembling |
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CN201621395176.2U CN206400857U (en) | 2016-12-19 | 2016-12-19 | Teaching platform is used in a kind of wire harness assembling |
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CN107581778A (en) * | 2017-09-29 | 2018-01-16 | 范中麟 | A kind of adjustable smart home dining table |
CN108466644A (en) * | 2018-02-08 | 2018-08-31 | 禹伟 | A kind of fixation transport device of oil exploitation tool |
CN108703594A (en) * | 2018-04-26 | 2018-10-26 | 叶烨 | A kind of novel foodstuff rack |
CN108938135A (en) * | 2018-05-25 | 2018-12-07 | 华建海 | A kind of veterinary inspection crane |
CN109473000A (en) * | 2019-01-22 | 2019-03-15 | 商洛学院 | A kind of English teaching outpost formula testing apparatus |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107581778A (en) * | 2017-09-29 | 2018-01-16 | 范中麟 | A kind of adjustable smart home dining table |
CN108466644A (en) * | 2018-02-08 | 2018-08-31 | 禹伟 | A kind of fixation transport device of oil exploitation tool |
CN108703594A (en) * | 2018-04-26 | 2018-10-26 | 叶烨 | A kind of novel foodstuff rack |
CN108938135A (en) * | 2018-05-25 | 2018-12-07 | 华建海 | A kind of veterinary inspection crane |
CN109473000A (en) * | 2019-01-22 | 2019-03-15 | 商洛学院 | A kind of English teaching outpost formula testing apparatus |
CN109473000B (en) * | 2019-01-22 | 2020-08-28 | 商洛学院 | Checkpoint type testing device for English teaching |
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