CN110103615A - A kind of digital drafting instrument - Google Patents

A kind of digital drafting instrument Download PDF

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Publication number
CN110103615A
CN110103615A CN201910419850.8A CN201910419850A CN110103615A CN 110103615 A CN110103615 A CN 110103615A CN 201910419850 A CN201910419850 A CN 201910419850A CN 110103615 A CN110103615 A CN 110103615A
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CN
China
Prior art keywords
disk
component
plate
shaft
drafting instrument
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Pending
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CN201910419850.8A
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Chinese (zh)
Inventor
徐秋仓
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Individual
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Individual
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Priority to CN201910419850.8A priority Critical patent/CN110103615A/en
Publication of CN110103615A publication Critical patent/CN110103615A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00Circular curve-drawing or like instruments

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  • Drawing Aids And Blackboards (AREA)

Abstract

The present invention relates to a kind of digital drafting instruments, including disk, operation panel, shaft, driving mechanism and drawing mechanism, operation panel is equipped with display screen and several keys, driving mechanism includes translation component, rack and pinion, drawing mechanism includes telescopic component, balanced component, plate and charting component, charting component includes electromagnet, iron plate, spring, pressure sensor, pen tube and four position-limiting units, translating component includes first motor, screw rod and casing, the digital drafting instrument adjusts the rotational angle of shaft by driving mechanism, convenient for adjusting the arc angle drawn, utilize the adjustable arc radius drawn of telescopic unit, moreover, iron plate is pushed using the spring in charting component, so that the chalk in pen tube is resisted against on blackboard, guarantee that chalk is contacted with the good of blackboard, convenient for drawing clearly figure, to improve The practicability of equipment.

Description

A kind of digital drafting instrument
Technical field
The present invention relates to teaching equipment field, in particular to a kind of digital drafting instrument.
Background technique
In mathematical education, instructors usually utilize compasses and multi-functional triangular ruler these drawing tools to draw on blackboard All kinds of circles or circular arc deepen the study impression of student, reach the teaching mesh of instructors by facilitating the understanding of student by figure 's.
But in these existing drawing tools, the structure fixed single of set square, the arc radius of drafting immobilizes, Circular arc and angle that various radiuses cannot be drawn are greater than 180 ° of circular arc, and although compasses facilitate drafting circular arc, but are drawing During figure, length shortens after chalk rubs on blackboard, causes to be easy to appear in the later period chalk of drawing with blackboard and contacts not Good, the circular arc lines drawn at this time attenuate compared to initial stage, are unfavorable for the display of figure, need teacher in thinner place of drawing Side flyback to enhance display, these have resulted in existing mathematics drawing tool practicability and have reduced.
Summary of the invention
The technical problem to be solved by the present invention is for overcome the deficiencies in the prior art, providing a kind of digital drafting instrument.
The technical solution adopted by the present invention to solve the technical problems is: a kind of digital drafting instrument, including disk, operating surface Plate, shaft, driving mechanism and drawing mechanism, through-hole is equipped at the center of the disk, and the shaft is located at the inside of through-hole, institute It states driving mechanism and operation panel is arranged at the front of disk, the back side of disk, the disk is arranged in the drawing mechanism Interior to be equipped with PLC, the operation panel is equipped with display screen and several keys, and the display screen and key are electrically connected with PLC;
The driving mechanism includes translation component, rack and pinion, and the translation component is connect with rack-driving, the tooth Item is fixed in shaft, and the gear and shaft are coaxially disposed, and the rack gear is located between gear and translation component, the gear It is engaged with rack;
The drawing mechanism includes telescopic component, balanced component, plate and charting component, and the telescopic component and plate pass Dynamic connection, the charting component are located at the side of the separate disk of plate, and the telescopic component is connected by balanced component and disk It connects;
The charting component includes electromagnet, iron plate, spring, pressure sensor, pen tube and four position-limiting units, the electricity Magnet is fixed on plate, and the iron plate is located at the side of the close electromagnet of plate, and the electromagnet passes through spring and pressure Sensor connection, the electromagnet and pressure sensor are electrically connected with PLC, and the spring is in compressive state, the pen tube It is fixed on iron plate, four position-limiting units are located at the four corners of iron plate.
Preferably, the translation component includes first motor, screw rod and casing, institute in order to which drive rack is moved It states first motor to be fixed on disk, the first motor is electrically connected with PLC, and one end of the first motor and screw rod, which is driven, to be connected It connects, the other end of the screw rod is arranged in casing, and described sleeve pipe is fixed on the top of rack gear, the company with screw rod of described sleeve pipe It connects to locate to be equipped with and be resisted against on disk with the matched screw thread of screw rod, described sleeve pipe.
Preferably, for the ease of draw different radii circular arc, the telescopic component includes cylinder, the cylinder with PLC electrical connection, the cylinder body of the cylinder are fixedly connected with shaft, and the gas bar of the cylinder is fixedly connected with plate.
Preferably, in order to control the moving distance of the gas bar of cylinder, the intracorporal bottom of the cylinder of the cylinder is equipped with distance Sensor, the range sensor are electrically connected with PLC.
Preferably, the synchronous rotation in order to realize pen tube and plate, the position-limiting unit includes gag lever post and limited block, The limited block is fixedly connected by gag lever post with plate, and the iron plate is set on gag lever post.
Preferably, the smooth rotation in order to guarantee plate, the balanced component include annular slide track, three balance weights and Four connecting rods, the telescopic unit and three balance weights pass through four connecting rods respectively and are successively fixedly connected from beginning to end, and the sliding is set Set on disk, the side of the close slideway of the balance weight is equipped with sliding block, and the sliding block matches with slideway, the sliding block and Slideway is slidably connected, and the other side of the balance weight is equipped with stabilizer blade.
Preferably, in order to reduce the friction between stabilizer blade and blackboard, the side of the separate balance weight of the stabilizer blade is equipped with Recess, the recess is interior to be equipped with ball, and the ball matches with recess, and the centre of sphere of the ball is located in recess.
Preferably, the stable rotation in order to guarantee sliding block, the slideway is dovetail groove.
Preferably, the use of equipment for convenience, the front of the disk is equipped with lantern ring and connecting plate, the set ring set It is located in shaft, the operation panel is fixed on the lower section of lantern ring by connecting plate.
Preferably, lantern ring is detached from shaft in order to prevent, the front of the disk is additionally provided with limitting casing, the limitting casing The shape of horizontal cross-section is U-shaped, and the both ends of the limitting casing are each attached on disk, and the connecting plate is located at the interior of limitting casing Side.
The invention has the advantages that the digital drafting instrument adjusts the rotational angle of shaft by driving mechanism, convenient for adjusting The arc angle drawn is saved, moreover utilizes the bullet in charting component using the adjustable arc radius drawn of telescopic unit Spring pushes iron plate, so that the chalk in pen tube is resisted against on blackboard, guarantees that chalk is contacted with the good of blackboard, clear convenient for drawing Figure, to improve the practicability of equipment.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of digital drafting instrument of the invention;
Fig. 2 is the rearview of digital drafting instrument of the invention;
Fig. 3 is the structural schematic diagram of the charting component of digital drafting instrument of the invention;
Fig. 4 is the structural schematic diagram of the balance weight of digital drafting instrument of the invention;
In figure: 1. disks, 2. operation panels, 3. shafts, 4. display screens, 5. keys, 6. rack gears, 7. gears, 8. plates, 9. Electromagnet, 10. iron plates, 11. springs, 12. pressure sensors, 13. pen tubes, 14. first motors, 15. screw rods, 16. casings, 17. Cylinder, 18. range sensors, 19. gag lever posts, 20. limited blocks, 21. slideways, 22. balance weights, 23. connecting rods, 24. sliding blocks, 25. Stabilizer blade, 26. balls, 27. lantern rings, 28. connecting plates, 29. limitting casings.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figs. 1-2, a kind of digital drafting instrument, including disk 1, operation panel 2, shaft 3, driving mechanism and draught machine Structure, through-hole is equipped at the center of the disk 1, and the shaft 3 is located at the inside of through-hole, the driving mechanism and operation panel 2 It is arranged at the front of disk 1, the drawing mechanism is arranged in the back side of disk 1, is equipped with PLC, the operation in the disk 1 Panel 2 is equipped with display screen 4 and several keys 5, and the display screen 4 and key 5 are electrically connected with PLC;
PLC, i.e. programmable logic controller (PLC), it is used for its internally stored program, is held using a kind of programmable memory The user oriented instruction such as row logical operation, sequential control, timing, counting and arithmetical operation, and by digital or analog defeated Enter/export the various types of mechanical or production processes of control, its essence is a kind of computer for being exclusively used in Industry Control, hardware Structure is substantially identical as microcomputer, the reception and output of processing and the instruction of data is generally used for, for realizing in Centre control.
Teacher, when drawing circular arc on blackboard, by after the backing against on blackboard of disk 1, is led to using the digital drafting instrument The key 5 crossed on operation panel 2 is operated, and the radius and angle of the circular arc that the input of key 5 needs to draw, display screen 4 are utilized For the information that display button 5 inputs, then equipment starts, and is acted in shaft 3 by driving assembly, so that the position of shaft 3 It drives drawing mechanism to carry out mapping operation in the one end at 1 back side of disk, draws on blackboard.
As shown in Figure 1, the driving mechanism includes translation component, rack gear 6 and gear 7, the translation component and rack gear 6 are passed Dynamic connection, the rack gear 6 are fixed in shaft 3, and the gear 7 is coaxially disposed with shaft 3, and the rack gear 6 is located at 7 peace of gear It moves between component, the gear 7 is engaged with rack gear 6;
When driving mechanism is run, PLC control translation component starting, band carry-over bar 6 is translated, and rack gear 6 acts on therewith On meshed gears 7, so that gear 7 rotates, since gear 7 is fixed in shaft 3, so that shaft 3 rotates, and then drive The rotation of drawing mechanism, by controlling the moving distance of rack gear 6, i.e., the rotational angle of controllable gear 7 controls the circular arc of drafting Angle.
As shown in Fig. 2, the drawing mechanism includes telescopic component, balanced component, plate 8 and charting component, it is described flexible Component and plate 8 are sequentially connected, and the charting component is located at the side of the separate disk 1 of plate 8, and the telescopic component passes through flat Weighing apparatus component is connect with disk 1;
In drawing mechanism, plate 8 can be driven mobile by telescopic component, when driving mechanism is run after, the drawing on plate 8 Component rotates on blackboard around the axis of shaft 3, the moving distance of plate 8 is controlled by telescopic component, and then can control and draw The radius length of the circular arc of system can realize the telescopic component rotation stable at the back side of disk 1 using balanced component.
As shown in figure 3, the charting component includes electromagnet 9, iron plate 10, spring 11, pressure sensor 12,13 and of pen tube Four position-limiting units, the electromagnet 9 are fixed on plate 8, and the iron plate 10 is located at the side of the close electromagnet 9 of plate 8, The electromagnet 9 is connect by spring 11 with pressure sensor 12, and the electromagnet 9 and pressure sensor 12 are electrically connected with PLC It connects, the spring 11 is in compressive state, and the pen tube 13 is fixed on iron plate 10, and four position-limiting units are located at iron plate 10 Four corners.
Before being drawn, first chalk can be inserted into pen tube 13, then leaned against disk 1 on blackboard, at this time pen tube Chalk in 13 is resisted against in black and white, in 8 rotation process of plate, drives iron plate 10 to rotate by limit assembly, so that band is started writing Pipe 13 and the rotation of internal chalk, chalk is mobile on the surface of blackboard, realizes the function of drawing circular arc, with the progress of drawing, The length of chalk shortens, in order to guarantee that contact of the chalk with blackboard, PLC control weaken through the electric current inside electromagnet 9, so that The magnetic of electromagnet 9 reduces, and reduces to the attraction of iron plate 10, and spring 11 compressed at this time is to restore deformation, pushes iron plate 10 is mobile close to blackboard, so that the chalk in pen tube 13 is resisted against on blackboard, prevents chalk to draw with blackboard poor contact Lines are not clear enough, by guaranteeing that chalk is contacted with the good of blackboard, convenient for drawing clearly figure.
As shown in Figure 1, the translation component includes first motor 14, screw rod 15 and casing 16, the first motor 14 is solid It is scheduled on disk 1, the first motor 14 is electrically connected with PLC, and the first motor 14 and one end of screw rod 15 are sequentially connected, institute The other end for stating screw rod 15 is arranged in casing 16, and described sleeve pipe 16 is fixed on the top of rack gear 6, described sleeve pipe 16 and screw rod 15 junction is equipped with to be resisted against on disk 1 with the matched screw thread of screw rod 15, described sleeve pipe 16.PLC control first motor 14 opens It is dynamic, drive screw rod 15 to rotate, screw rod 15 passes through threaded function on shroud 16, so that axis of the casing 16 along screw rod 15, The surface of disk 1 is moved, and then is translated with carry-over bar 6.
Preferably, the telescopic component includes cylinder 17, the cylinder 17 for the ease of drawing the circular arc of different radii It is electrically connected with PLC, the cylinder body of the cylinder 17 is fixedly connected with shaft 3, and the gas bar of the cylinder 17 is fixedly connected with plate 8. PLC controls cylinder 17 and starts, band take offence bar gas bar it is mobile, realize the movement of plate 8, change the axis of plate 8 and disk 1 Distance draws the circular arc of different radii convenient for equipment.
Preferably, in order to control the moving distance of the gas bar of cylinder 17, the intracorporal bottom of cylinder of the cylinder 17 is equipped with Range sensor 18, the range sensor 18 are electrically connected with PLC.When controlling the movement of plate 8, range sensor 18 is utilized to examine The gas bar of cylinder 17 is surveyed at a distance from the intracorporal bottom of cylinder of cylinder 17, and range data is passed into PLC, PLC compares distance Data and teacher pass through the radius length of the circular arc for the drafting that key 5 is set, and adjust cylinder 17 and run, so that the circular arc drawn half Electrical path length meets the requirement of teacher's setting.
Preferably, the synchronous rotation in order to realize pen tube 13 and plate 8, the position-limiting unit includes gag lever post 19 and limit Position block 20, the limited block 20 are fixedly connected by gag lever post 19 with plate 8, and the iron plate 10 is set on gag lever post 19.It is flat When plate 8 rotates, the gag lever post 19 being fixed on plate 8 is driven to rotate, so that gag lever post 19 acts on iron plate 10, so that Chalk in pen tube 13 and pen tube 13 on iron plate 10 and iron plate 10 rotates synchronously, and prevents iron plate 10 to be detached from using limited block 20 Gag lever post 19.
Preferably, the smooth rotation in order to guarantee plate 8, the balanced component includes annular slide track 21, three balances By four connecting rods 23, successively head and the tail fix company respectively for block 22 and four connecting rods 23, the telescopic unit and three balance weights 22 It connects, described to be slidably arranged on disk 1, the side of the close slideway 21 of the balance weight 22 is equipped with sliding block 24, the sliding block 24 Match with slideway 21, the sliding block 24 is slidably connected with slideway 21, and the other side of the balance weight 22 is equipped with stabilizer blade 25.It will justify Disk 1 backs against on blackboard, so that stabilizer blade 25 is resisted against on blackboard, when driving mechanism is run, shaft 3 is driven to rotate, so that Cylinder 17 rotates, and is rotated by connecting rod 23 with dynamic balance weight 22, so that the sliding block of the side of the close disk 1 of balance weight 22 24 are slided in the sliding block 24 of fixed position, ensure that the smooth rotation of cylinder 17, and then are realized the steady of plate 8 and turned It is dynamic.
Preferably, in order to reduce the friction between stabilizer blade 25 and blackboard, the one of the separate balance weight 22 of the stabilizer blade 25 Side is equipped with recess, is equipped with ball 26 in the recess, and the ball 26 matches with recess, and the centre of sphere of the ball 26 is located at recessed In mouthful.Ball 26 in the recess of stabilizer blade 25 is resisted against on blackboard, reduces the contact area of equipment and blackboard, is convenient for cylinder 17 In rotation process, while rotation by connecting rod 23 with dynamic balance weight 22, ball 26 is rolled in recess and is carried out along blackboard It rolls, reduces the friction between stabilizer blade 25 and blackboard.
Preferably, the stable rotation in order to guarantee sliding block 24, the slideway 21 is dovetail groove.Since slideway 21 is dovetail Slot further ensures the stable rotation of sliding block 24 so that sliding block 24 can not be detached from slideway 21.
Preferably, the use of equipment for convenience, the front of the disk 1 is equipped with lantern ring 27 and connecting plate 28, described Lantern ring 27 is set in shaft 3, and the operation panel 2 is fixed on the lower section of lantern ring 27 by connecting plate 28.Utilize 27 sets of lantern ring In shaft 3, facilitate and relatively rotate between lantern ring 27 and shaft 3, operation panel 2 is arranged in lantern ring using connecting plate 28 27 lower section, convenient in equipment use process, operation panel 2 is always positioned at the positive lower part of disk 1, thus convenient to key 5 are operated, and control equipment is drawn.
Preferably, lantern ring 27 is detached from shaft 3 in order to prevent, the front of the disk 1 is additionally provided with limitting casing 29, the limit The shape of the horizontal cross-section of position frame 29 is U-shaped, and the both ends of the limitting casing 29 are each attached on disk 1, the connecting plate 28 In the inside of limitting casing 29.Connecting plate 28 is limited in its inside using limitting casing 29, lantern ring 27 is prevented to be detached from shaft 3.
Teacher utilizes the circular arc of the setting drafting of key 5 on operation panel 2 when drawing circular arc using the digital drafting instrument Angle and radius, it is mobile that plate 8 is controlled by telescopic unit, the arc radius of drafting is adjusted, passes through translation component and control tooth Item 6 is mobile, to control the rotational angle of gear 7 and shaft 3, and then the adjustable arc angle drawn moreover passes through The size of current of electromagnet 9 is controlled, so that the spring 11 of compression generates specific thrust to iron plate 10, so that the powder in pen tube 13 Pen is resisted against on blackboard, is guaranteed that chalk is contacted with the good of blackboard, convenient for drawing clearly figure, is improved the practical of equipment Property.
Compared with prior art, which adjusts the rotational angle of shaft 3 by driving mechanism, draws convenient for adjusting The arc angle of system moreover utilizes the spring 11 in charting component using the adjustable arc radius drawn of telescopic unit Iron plate 10 is pushed, so that the chalk in pen tube 13 is resisted against on blackboard, guarantees that chalk is contacted with the good of blackboard, it is clear convenient for drawing Clear figure, to improve the practicability of equipment.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.

Claims (10)

1. a kind of digital drafting instrument, which is characterized in that including disk (1), operation panel (2), shaft (3), driving mechanism and draw Figure mechanism, through-hole is equipped at the center of the disk (1), and the shaft (3) is located at the inside of through-hole, the driving mechanism and behaviour Make the front that panel (2) is arranged at disk (1), the drawing mechanism setting is in the back side of disk (1), the disk (1) Equipped with PLC, the operation panel (2) is equipped with display screen (4) and several keys (5), and the display screen (4) and key (5) are equal It is electrically connected with PLC;
The driving mechanism includes translation component, rack gear (6) and gear (7), and the translation component and rack gear (6) are sequentially connected, The rack gear (6) is fixed on shaft (3), and the gear (7) and shaft (3) are coaxially disposed, and the rack gear (6) is located at gear (7) between translation component, the gear (7) is engaged with rack gear (6);
The drawing mechanism includes telescopic component, balanced component, plate (8) and charting component, the telescopic component and plate (8) Transmission connection, the charting component are located at the side of the separate disk (1) of plate (8), and the telescopic component passes through balanced component It is connect with disk (1);
The charting component includes electromagnet (9), iron plate (10), spring (11), pressure sensor (12), pen tube (13) and four Position-limiting unit, the electromagnet (9) are fixed on plate (8), and the iron plate (10) is located at the close electromagnet (9) of plate (8) Side, the electromagnet (9) connect by spring (11) with pressure sensor (12), the electromagnet (9) and pressure sensing Device (12) is electrically connected with PLC, and the spring (11) is in compressive state, and the pen tube (13) is fixed on iron plate (10), and four A position-limiting unit is located at the four corners of iron plate (10).
2. digital drafting instrument as described in claim 1, which is characterized in that the translation component includes first motor (14), silk Bar (15) and casing (16), the first motor (14) are fixed on disk (1), and the first motor (14) is electrically connected with PLC, One end of the first motor (14) and screw rod (15) is sequentially connected, and the other end of the screw rod (15) is arranged in casing (16) Interior, described sleeve pipe (16) is fixed on the top of rack gear (6), described sleeve pipe (16) be equipped with the junction of screw rod (15) and screw rod (15) matched screw thread, described sleeve pipe (16) are resisted against on disk (1).
3. digital drafting instrument as described in claim 1, which is characterized in that the telescopic component includes cylinder (17), the gas Cylinder (17) is electrically connected with PLC, and the cylinder body of the cylinder (17) is fixedly connected with shaft (3), the gas bar of the cylinder (17) and flat Plate (8) is fixedly connected.
4. digital drafting instrument as claimed in claim 3, which is characterized in that the intracorporal bottom of cylinder of the cylinder (17) be equipped with away from From sensor (18), the range sensor (18) is electrically connected with PLC.
5. digital drafting instrument as described in claim 1, which is characterized in that the position-limiting unit includes gag lever post (19) and limit Block (20), the limited block (20) are fixedly connected by gag lever post (19) with plate (8), and the iron plate (10) is set in gag lever post (19) on.
6. digital drafting instrument as described in claim 1, which is characterized in that the balanced component includes annular slide track (21), three A balance weight (22) and four connecting rods (23), the telescopic unit and three balance weights (22) respectively by four connecting rods (23) according to Secondary head and the tail are fixedly connected, described to be slidably arranged on disk (1), and the side of the close slideway (21) of the balance weight (22) is equipped with Sliding block (24), the sliding block (24) match with slideway (21), and the sliding block (24) is slidably connected with slideway (21), the balance The other side of block (22) is equipped with stabilizer blade (25).
7. digital drafting instrument as claimed in claim 6, which is characterized in that the one of the separate balance weight (22) of the stabilizer blade (25) Side is equipped with recess, is equipped with ball (26) in the recess, the ball (26) matches with recess, the centre of sphere of the ball (26) In recess.
8. digital drafting instrument as claimed in claim 6, which is characterized in that the slideway (21) is dovetail groove.
9. digital drafting instrument as described in claim 1, which is characterized in that the front of the disk (1) be equipped with lantern ring (27) and Connecting plate (28), the lantern ring (27) are set on shaft (3), and the operation panel (2) is fixed on set by connecting plate (28) The lower section of ring (27).
10. digital drafting instrument as claimed in claim 9, which is characterized in that the front of the disk (1) is additionally provided with limitting casing (29), the shape of the horizontal cross-section of the limitting casing (29) is U-shaped, and the both ends of the limitting casing (29) are each attached to disk (1) On, the connecting plate (28) is located at the inside of limitting casing (29).
CN201910419850.8A 2019-05-20 2019-05-20 A kind of digital drafting instrument Pending CN110103615A (en)

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Application Number Priority Date Filing Date Title
CN201910419850.8A CN110103615A (en) 2019-05-20 2019-05-20 A kind of digital drafting instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910419850.8A CN110103615A (en) 2019-05-20 2019-05-20 A kind of digital drafting instrument

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CN110103615A true CN110103615A (en) 2019-08-09

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CN201910419850.8A Pending CN110103615A (en) 2019-05-20 2019-05-20 A kind of digital drafting instrument

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CN113519954A (en) * 2021-08-05 2021-10-22 湖北佐尔美服饰有限公司 Template of template machine for clothing production convenient to use
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CN112428726A (en) * 2020-11-27 2021-03-02 绥化学院 Plotter for applied mathematics teaching
CN113519954A (en) * 2021-08-05 2021-10-22 湖北佐尔美服饰有限公司 Template of template machine for clothing production convenient to use
CN113787856A (en) * 2021-09-08 2021-12-14 滨州学院 Ruler with calculation function for advanced mathematics teaching and use method

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