CN102785282B - Spring support type quartzite forming device - Google Patents
Spring support type quartzite forming device Download PDFInfo
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- CN102785282B CN102785282B CN201210305575.5A CN201210305575A CN102785282B CN 102785282 B CN102785282 B CN 102785282B CN 201210305575 A CN201210305575 A CN 201210305575A CN 102785282 B CN102785282 B CN 102785282B
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- 239000011044 quartzite Substances 0.000 title 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000010453 quartz Substances 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000004575 stone Substances 0.000 abstract description 7
- 239000002969 artificial stone Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000010977 jade Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002928 artificial marble Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006317 isomerization reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011032 tourmaline Substances 0.000 description 1
- 229940070527 tourmaline Drugs 0.000 description 1
- 229910052613 tourmaline Inorganic materials 0.000 description 1
Images
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
本发明属于石材及人造合成石装置技术领域，具体涉及一种弹簧支撑型石英石成型装置。本发明主要解决现有石英石薄板成型装置振幅小、结构复杂、易损坏和成型机理不合理的问题。本发明的技术方案为：一种弹簧支撑型石英石成型装置，包括基座、传输带、支柱等部件，其中还包括若干套筒，其中在两侧和中间的套筒内安装有副弹簧和传动轴，传动轴的上端延伸到槽型压头外，传动轴的下端延伸到套筒的外部并与安装在钢板上的油缸的输出轴相连接；剩余的套筒内安装有T型滑动管件且T型滑动管件的下端延伸到套筒外部，在套筒内部位于T型滑动管件的上方设有主弹簧，所述主弹簧的上端延伸到槽型压头外。本发明具有振幅小、结构简单等优点。
The invention belongs to the technical field of stone materials and artificial synthetic stone devices, in particular to a spring-supported quartz stone forming device. The invention mainly solves the problems of small vibration amplitude, complex structure, easy damage and unreasonable forming mechanism of the existing quartz stone thin plate forming device. The technical solution of the present invention is: a spring-supported quartz stone forming device, including a base, a transmission belt, a pillar and other components, and a number of sleeves, wherein auxiliary springs and Transmission shaft, the upper end of the transmission shaft extends out of the grooved pressure head, the lower end of the transmission shaft extends out of the sleeve and is connected with the output shaft of the oil cylinder installed on the steel plate; T-shaped sliding pipe fittings are installed in the remaining sleeve And the lower end of the T-shaped sliding pipe extends to the outside of the sleeve, and a main spring is arranged above the T-shaped sliding pipe inside the sleeve, and the upper end of the main spring extends outside the groove-shaped indenter. The invention has the advantages of small amplitude, simple structure and the like.
Description
Technical field
The invention belongs to stone material and artificial synthetic stone device technique field, be specifically related to a kind of spring supporting type quartz shaped device.
Background technology
Artificial quartz in lump is to be raw material with silica sand, silica flour and binding agent etc., through operation in the early stage of batching, stirring and cloth, and the sheet forming that carries out isomerization polymerization with the active force of vacuum, vibration and compression, then with the building decorative plates solidifying, later stage operation fixed thick and that grind is made hard.China introduced the artificial marble hilllock stone production line of Italian Breton company since 1986, artificial synthetic stone industry is gone through jiggly evolution, and nearly ten years gradually to expansion aspect texture type, silica sand type and jade aggretion type product.Although domestic, have tens of enterprises in succession to research and develop the core technology equipment of the whole line of quartz---quartz sheet forming device trigger squeeze, from the packing of the sintetics of its making compared with the 2.5g/cm of advanced country
3index, and the resin proportional quantity of coarse sand material surpasses 7% present situation, existing quartz sheet forming is from theoretical research and design, not yet in place or lack its compact formed summary of experience.Electromagnetic artificial quartz in lump, the patent No. is 200810054684.8 Chinese patent, adopt six groups of electromagnet and Compress Spring to support the through-flow mode of half-wave of drive link and six beats thereof, what by the synthetic excited frequency that forms 6 * 50HZ of frequency stack, equated with compression stress with exciting force rubs pressure vibration processes, but can only make it rest on development by the cumbersome property of non feedback type inverter control because of gap palpus correspondence adjusting, the pulse half wave of the dynamic and static iron core of its electromagnet.
The trigger squeeze of existing 305 * 165cm plane specification and adapted 8 * 10KW vibrating motor, although supporting upper framework by lead, its agent structure simplifies into the structure of side installing oil cylinder, but the lower pulling force that makes pressure head produce downward about 500000N to its special system of taking out-0.1MPa vacuum also lacks understanding by the problem that seriously restricts amplitude, secondly by pressure head trace, swing and form the necessity of rubbing pressure process and also lack understanding.It is interior in feature that the coefficient of internal friction that quartz compound is larger and its coefficient of elasticity expand rapidly in compression, makes its only frequency of the amplitude more than 0.8mm and 50-150HZ, or rub in the local assault of pressure and just may reach good fine and close effect.Amplitude not only depends on exciting force, is also subject to the impact of vibrational system deadweight, how to eliminate its vacuum-draw power and is actually the key point that improves its amplitude.Managing to make pressure head in resiliency supported and form the vibrational state moving in turn, is to solve the basic ideas that its fine and close level is poor and power consumption is larger.
Summary of the invention
The present invention is little mainly for existing quartz sheet forming device amplitude, complex structure, the fragile and irrational problem of moulding mechanism, and a kind of spring supporting type quartz shaped device is provided.
The present invention addresses the above problem the technical scheme of taking to be:
A kind of spring supporting type quartz shaped device, comprise pedestal, be arranged on the transport tape on pedestal, be arranged on the pillar of pedestal below, be arranged on the lead of four jiaos of pedestals, be arranged on lead and along the vacuum (-tight) housing of lead vertical lift, be arranged in vacuum (-tight) housing and the grooved pressure head moving both vertically in vacuum (-tight) housing, the lower plane of grooved pressure head exceeds the lower surface 80-160mm of vacuum (-tight) housing, it is characterized in that: also comprise and be arranged on the vacuum (-tight) housing some sleeves on the square frame of both sides along the length direction, wherein in both sides and middle sleeve, auxiliary spring and power transmission shaft are installed, the upper end of described power transmission shaft extends to outside grooved pressure head, and fix by the elastomeric pad and the secondary support member that are arranged on grooved pressure head, the lower end of power transmission shaft extends to the outside of sleeve and is connected with the output shaft that is arranged on 4-6 oil cylinder on steel plate, steel plate is arranged on pedestal, the lower end that T-shaped slip pipe fitting and T-shaped slip pipe fitting are installed in remaining sleeve extends to sleeve outside, T-shaped slip pipe fitting can down sliding 80-160mm, sleeve inner be positioned at T-shaped slip pipe fitting above be provided with main spring, the upper end of described main spring extends to outside grooved pressure head, on grooved pressure head, be provided with main support member, the upper end in contact of main support member and main spring, some vibrating motors are installed in the cavity of grooved pressure head.
Wherein said main spring is that material diameter is the cylindrical screw-type spring that 16-24mm, central diameter are 60-120mm, and main spring will make grooved pressure head under the lower pulling force close to-0.1MPa vacuum and Gravitative Loads thereof, apart from the upper surface of compound, keep the distance of 5-50mm to the support force of main support member and grooved pressure head.
It is the shunt control mode of a group that described 4-6 oil cylinder adopts only single or adjacent two, and with lag behind successively 1-3 second and respectively through-flow the or increase oil pressure mode of the order of conducting 3-9 second carry out the loop control of four beats or six beats.
Described vibrating motor can be divided into 2-4 unit, coaxial connection in unit, be arranged symmetrically with on the whole and unit between reversed operation.
The mechanism of structure of the present invention and vibration moulding is: grooved pressure head is carried out to resiliency supported with two row's Compress Springs and support member, especially in the compression stress of spring with vacuum pulling force with deadweight close to balance, and when the lower plane of grooved pressure head and the upper plane of compound approach, can produce larger amplitude with less exciting force, and when strong nearly vibration frequency is close with intrinsic frequency, amplitude be reached with the large effect of little control in its resonance; Exciting force by vibrating motor interlock grooved pressure head acts on compound on the one hand, acts on the other hand Compress Spring, has therefore avoided the coefficient of elasticity of compound in moulding to become attenuation large and that amplitude is produced; Control mode vacuum (-tight) housing and grooved pressure head being linked with a group oil cylinder, greatly simplifies the structure of equipment, and the elastic reaction that is especially set with rubber blanket on power transmission shaft can significantly reduce the fault rate of extremely flimsy driving member; Oil cylinder adopts 0.1-5HZ low frequency and the through-flow control that circulates, just grooved pressure head in vibration, produces take turns dynamic formula rub pressure vibration processes, to act on the impulsive force that part and row move, reach the good fine and close effect of compound; The arrangement of coaxial connection in reversed operation between unit and unit for vibrating motor, utilize frequency to capture principle from the asynchronous run-in synchronism state that progresses into, wherein the upper frequency of asynchronous middle formation with synchronize in produce compared with large amplitude, all have certain fine and close effect.
Compared with prior art, it is to improve amplitude with reducing system deadweight with the way from gravity sum from principle that the present invention offsets vacuum pulling force with spring force, and uses the general power decline that makes vibrating motor close to resonance state; In sleeve, configure main spring and slip pipe fitting, after utilizing vacuum (-tight) housing to rise, slip pipe fitting moves down and the corresponding of main spring moves down, make the lower plane of grooved pressure head stretch out the lower surface of vacuum (-tight) housing and be convenient to clear up the material body that its edge adheres to, and formed with this resiliency supported and the feature that can move down the condition that two parts is linked and controlled with a group oil cylinder; Grooved pressure head employing rubber blanket is supported and is used the control mode of pull-down, the amplitude fading effect while having avoided applying compression stress; The sheet forming device of existing use two group oil cylinders being controlled respectively to grooved pressure head and vacuum (-tight) housing undergoes technological transformation, can be at vacuum (-tight) housing setting height(from bottom) 4-12 the sleeve identical with vacuum (-tight) housing height on the square frame of both sides along the length direction, and configure therein slip pipe fitting and main spring, simultaneously after grooved pressure head correspondence position is installed main support member, form symmetrical flexible support system, thereby in the through-flow control of circulation of controlling pressure head, reach the effect that amplitude and fine and close level significantly improve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
The specific embodiment
As shown in Figure 1, a kind of spring supporting type quartz shaped device, comprise pedestal 1, be arranged on the transport tape 2 on pedestal 1, be arranged on the pillar 16 of pedestal 1 below, be arranged on the lead 4 of 1 four jiaos of pedestals, be arranged on lead 4 and along the vacuum (-tight) housing 3 of lead 4 vertical lifts, be arranged in vacuum (-tight) housing 3 and the grooved pressure head 5 moving both vertically in vacuum (-tight) housing 3, the lower plane of grooved pressure head 5 exceeds the lower surface 80-160mm of vacuum (-tight) housing 3, it is characterized in that: also comprise and be arranged on the vacuum (-tight) housing 3 some sleeves 14 on the square frame of both sides along the length direction, wherein in both sides and middle sleeve 14, auxiliary spring 10 and power transmission shaft 7 are installed, the upper end of described power transmission shaft 7 extends to outside grooved pressure head 5, and fixing by the elastomeric pad 13 and the secondary support member 8 that are arranged on grooved pressure head 5, the lower end of power transmission shaft 7 extends to the outside of sleeve 14 and is connected with the output shaft that is arranged on 4-6 oil cylinder 6 on steel plate 17, steel plate 17 is arranged on pedestal 1, the lower end that T-shaped slip pipe fitting 15 and T-shaped slip pipe fitting 15 are installed in remaining sleeve 14 extends to sleeve 14 outsides, T-shaped slip pipe fitting 15 can down sliding 80-160mm, sleeve 14 inside be positioned at T-shaped slip pipe fitting 15 above be provided with main spring 11, the upper end of described main spring 11 extends to outside grooved pressure head 5, on pressure head 5, be provided with main support member 9, the upper end in contact of main support member 9 and main spring 11, some vibrating motors 12 are installed in the cavity of grooved pressure head 5,
Wherein said main spring 11 for material diameter be the cylindrical screw-type that 16-24mm, central diameter are 60-120mm, and the support force of 11 pairs of main support members 9 of main spring and grooved pressure head 5 will make grooved pressure head 5 under the lower pulling force close to-0.1MPa vacuum and Gravitative Loads thereof, apart from the upper surface of compound, keep the distance of 5-50mm;
It is the shunt control mode of a group that described 4-6 oil cylinder adopts only single or adjacent two, and with lag behind successively 1-3 second and respectively through-flow the or increase oil pressure mode of the order of conducting 3-9 second carry out the loop control of four beats or six beats;
Described vibrating motor can be divided into 2-4 unit, coaxial connection in unit, be arranged symmetrically with on the whole and unit between reversed operation.
Technical process of the present invention is: adopt unsaturated-resin and the auxiliary agent of 5.5%-7.0% mass ratio, same quartz sand, silica flour and pigment stir into the compound of loose shape jointly; After cloth and lay cardboard, with rubber transport tape processed, sent into and in shaped device, carried out the sheet forming that thickness is 12-30mm; With oil cylinder and power transmission shaft drive vacuum (-tight) housing to decline and its four frame inwalls that compound is formed to edge is spacing, and retracted and main spring rising in 2*6 the slip pipe fitting lower end among sleeve, made vacuum (-tight) housing and entered resiliency supported state; Start vavuum pump and carry out the system of taking out close to-0.1Mpa vacuum, therebetween, the vertical height of pressure head moves down 60-100mm gradually with the rising of vacuum, its bottom surface still keeps the distance of 5-30mm above compound, and oil cylinder interlock pressure head moves downwards and compound is compressed; Vibration on Start-up motor carries out the vibration of 1-2min, and oil cylinder therebetween carries out loop control by the frequency of 1-5HZ, thereby makes pressure head work in the vibrational state that row moves formula; Discharge vacuum and the heating cure of rising after vacuum (-tight) housing, fixed thick and grinding step is still used current device and technique, finally makes product density and reaches 2.5g/cm
3the artificial quartz stone plate of index.
Embodiment 2
As shown in Figure 1, a kind of spring supporting type quartz shaped device, adopt the present invention to existing use two group oil cylinders or wherein one group be cylinder trigger squeeze undergoes technological transformation, its concrete grammar is: keep the basic structure of original pedestal 1, transport tape 2, vacuum (-tight) housing 3, pressure head 5 and oil cylinder 6 constant, also do not set up secondary support member 8 and auxiliary spring 10; Original vacuum (-tight) housing 5 forward two sides on two straight lines of its shaped as frame inwall 120-200mm, vertically drill through respectively 8 circular holes, and it highly put to the steel sleeve 14 that 5 highly equal internal diameters are 120mm with vacuum be welded on circular hole; The slip pipe fitting 15 that to be respectively charged into T-shaped lower end diameter and to be 60mm and upper flanges dish diameter in sleeve be 120mm, to be respectively charged into material diameter be again 24mm, the main spring 11 that central diameter D is 90mm; Holing respectively with the upper end limit of the vertical corresponding pressure head 5 of sleeve, and with the main support member 9 of bolted, thereby utilize main spring to prop up pressure head 5; If the arrangement of the double vibrating motor 2*4 of configuration in flute profile pressure head, can cancel its middle part power transmission shaft, become between four unit of 2* (2+2) and unit from laterally, equal arrangement of reversed operation forward; The control mode that the hydraulic component of control oil pump 6 can be 0.1-1HZ with the switching frequency of single cylinder 6 beats along separate routes, forms to the compression of pressure head the process that moves in turn; Between the power transmission shaft that acts on pressure head 5 driving with oil cylinder 6, install the connecting piece of rubber ring flange or spring-compressed.
The requirement of technology controlling and process is: adopt 5-7% mass ratio unsaturated-resin, with siliceous jade and tourmaline grain and aluminium powder etc., carry out the moulding of health type silica sand plate; The oil pressure of controlling pressure head 5 will be adjusted to 1-5Mpa, makes as far as possible the compression stress of the oil cylinder 6 in vibration be slightly larger than exciting force or the two equates; The vibrating motor that is divided into four unit makes its frequency additive process close to generation 4*50HZ in asynchronous by mutual reverse mode, and in barycenter conservation self-balancing, be tending towards gradually amplitude synchronous and that generation is higher, thereby in both actings in conjunction, reach comparatively ideal fine and close effect.
Claims (4)
1. a spring supporting type quartz shaped device, comprise pedestal (1), be arranged on the transport tape (2) on pedestal (1), be arranged on the pillar (16) of pedestal (1) below, be arranged on the lead (4) of (1) four jiao of pedestal, be arranged on lead (4) upper and along the vacuum (-tight) housing (3) of lead (4) vertical lift, be arranged in vacuum (-tight) housing (3) and the grooved pressure head (5) moving both vertically in vacuum (-tight) housing (3), the lower plane of grooved pressure head (5) exceeds the lower surface 80-160mm of vacuum (-tight) housing (3), it is characterized in that: also comprise and be arranged on vacuum (-tight) housing (3) the some sleeves (14) on the square frame of both sides along the length direction, wherein in both sides and middle sleeve (14), auxiliary spring (10) and power transmission shaft (7) are installed, the upper end of described power transmission shaft (7) extends to outside grooved pressure head (5), and fixing by the elastomeric pad (13) and the secondary support member (8) that are arranged on grooved pressure head (5), the lower end of power transmission shaft (7) extends to the outside of sleeve (14) and is connected with the output shaft that is arranged on 4-6 the oil cylinder (6) on steel plate (17), steel plate (17) is arranged on pedestal (1), the lower end that T-shaped slip pipe fitting (15) and T-shaped slip pipe fitting (15) are installed in remaining sleeve (14) extends to sleeve (14) outside, T-shaped slip pipe fitting (15) can down sliding 80-160mm, the top that is positioned at T-shaped slip pipe fitting (15) in sleeve (14) inside is provided with main spring (11), the upper end of described main spring (11) extends to outside grooved pressure head (5), on grooved pressure head (5), be provided with main support member (9), the upper end in contact of main support member (9) and main spring (11), some vibrating motors (12) are installed in the cavity of grooved pressure head (5).
2. a kind of spring supporting type quartz shaped device according to claim 1, it is characterized in that described main spring (11) for material diameter be the cylindrical screw-type spring that 16-24mm, central diameter are 60-120mm, and main spring (11) will make grooved pressure head (5) under the lower pulling force close to-0.1MPa vacuum and Gravitative Loads thereof, apart from the upper surface of compound, keep the distance of 5-50mm to the support force of main support member (9) and grooved pressure head (5).
3. a kind of spring supporting type quartz shaped device according to claim 1, it is characterized in that it is the shunt control mode of a group that 4-6 described oil cylinder adopts only single or adjacent two, and with lag behind successively 1-3 second and respectively through-flow the or increase oil pressure mode of the order of conducting 3-9 second carry out the loop control of four beats or six beats.
4. a kind of spring supporting type quartz shaped device according to claim 1, is characterized in that described vibrating motor can be divided into 2-4 unit, coaxially connection unit in, be arranged symmetrically with on the whole and unit between reversed operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210305575.5A CN102785282B (en) | 2012-08-27 | 2012-08-27 | Spring support type quartzite forming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210305575.5A CN102785282B (en) | 2012-08-27 | 2012-08-27 | Spring support type quartzite forming device |
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| CN102785282A CN102785282A (en) | 2012-11-21 |
| CN102785282B true CN102785282B (en) | 2014-04-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103171019B (en) * | 2013-03-22 | 2015-02-04 | 刘建平 | Zigzag linkage type crushed stone aggregate forming device |
| CN103786238B (en) * | 2014-01-27 | 2016-08-17 | 湖北熙玛建材实业有限公司 | Artificial quartz stone plate compaction moulding device |
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| CN101486217A (en) * | 2009-02-19 | 2009-07-22 | 刘建平 | Method for synthesizing stone by layered vibration and moulding vibration device |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101244586B (en) * | 2008-03-22 | 2010-11-03 | 刘建平 | Electromagnetic artificial quartz in lump forming device |
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2012
- 2012-08-27 CN CN201210305575.5A patent/CN102785282B/en active Active
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| GB191027147A (en) * | 1910-11-22 | 1911-06-01 | Charles Ladd Norton | Process and Apparatus for the Manufacture of Fibre-concrete Sheets, Slabs and the like. |
| CN2063865U (en) * | 1990-03-08 | 1990-10-17 | 唐山马家沟耐火材料厂 | Vibration shaper |
| CN200954661Y (en) * | 2006-04-26 | 2007-10-03 | 刘建平 | Electromagnetic vibration type synthesized thin-plate forming machine |
| CN101412245A (en) * | 2008-10-27 | 2009-04-22 | 刘建平 | Electromagnetic combined apparatus for synthesizing stone pressure plate |
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