CN101462300A - Mold for shaping prefabricated thin-wall exhaust passage - Google Patents
Mold for shaping prefabricated thin-wall exhaust passage Download PDFInfo
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- CN101462300A CN101462300A CNA2009100955609A CN200910095560A CN101462300A CN 101462300 A CN101462300 A CN 101462300A CN A2009100955609 A CNA2009100955609 A CN A2009100955609A CN 200910095560 A CN200910095560 A CN 200910095560A CN 101462300 A CN101462300 A CN 101462300A
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Abstract
The invention relates to a prefabricated thin-walled exhaust passage forming die, and belongs to the technical field of prefabricated forming die of building facility. The die comprises an outer die and a core die formed by matching an upper core die and a lower core die, and is characterized in that the upper core die and the lower core die are formed by matching an n-shaped core die frame and a core die frame retraction mechanism respectively, an outer die frame is of a U-shaped structure and consists of a bottom die and side dies matched and connected at two sides, the upper ends of the two side dies are connected and matched through a transverse pull rod, and two ends of a die cavity consisting of the core die and the outer die are matched and provided with end frames. The forming die changes the prior construction mode of an exhaust passage, can achieve mechanized die operation, solve the problems of difficult vibration forming of the integral die, inconvenient detachment of the core die, and the like in the field of forming of prefabricated square thin-walled component, can ensure that vertical breaking load of a tube body is larger than 90kN, can adjust wall thickness of the tube body according to requirements, can simultaneously reduce energy fluctuation and loss caused by operation of a worker, save forming and manufacturing time of products, and save places for production greatly.
Description
Technical field
The invention belongs to the pre-formed technical field of mold of Architectural Equipment, be specifically related to a kind of mould of prefabricated thin-wall exhaust passage.
Background technology
Present dwelling house exhaust duct all adopts on-the-spot pure making by hand substantially, on-the-spot occupied ground is many, waste of raw materials is serious, and quality problems such as exhaust duct wall thickness are subjected to workman's skills involved in the labour and attitude, consciousness, the influence of subjective consciousnesses such as accountability, uniformity be cannot say for sure to demonstrate,prove, product quality can't be really controlled, the industry standard of " dwelling house exhaust duct " JG/T3044-1998 of Ministry of Construction's issue in 1998, the vertical failing load of body to the exhaust duct goods should be less than 38KN, this site operation mode can satisfy basically stipulate in the industry standard the requirement of the vertical failing load of 38KN body, the Ministry of Construction had issued new industry standard " house kitchen again in 2006, the toilet exhaust duct " JG/T194-2006, the body vertical bearing capacity of new industry standard code exhaust duct goods is not less than 90KN, and body wall thickness 12-15mm is had the explicit data regulation.So present employing pure made the requirement that the quality that can't guarantee product fully meets new standard by hand.
Summary of the invention
The present invention aims to provide a kind of mold for shaping prefabricated thin-wall exhaust passage technical scheme, and the exhaust duct product that complies with the national standard requirements with prefabricated profiled pattern manufacturing is to overcome problems of the prior art.
Described mold for shaping prefabricated thin-wall exhaust passage comprises adventitia and cooperates the core that constitutes by upper and lower core, it is characterized in that upper and lower core respectively by
Core is framed to cooperate formation with core frame jack, and adventitia is framed to be
The shape structure, the limit mould that is connected by bed die and both sides constitutes, and dual-side mould upper end connects by drag link and cooperates, and the die cavity two ends that core and adventitia constitute are equipped with the end frame.
Described mold for shaping prefabricated thin-wall exhaust passage, it is characterized in that described core frame jack comprises left and right side pull bar and the forward and backward center pull rod that is connected by one group of pulling-on piece, pulling-on piece is respectively by pin and left and right side pull bar and the flexible connection of forward and backward center pull rod, two pulling-on pieces that preceding center pull rod is connected with the left and right side pull bar become " V " shape structure, two pulling-on pieces that rear center's pull bar is connected with the left and right side pull bar become " V " shape structure, the left and right side pull bar respectively with
The framed left and right sides of core inwall is fixedly connected, and forward and backward center pull rod is connected with the folding and unfolding governor motion respectively.
Described mold for shaping prefabricated thin-wall exhaust passage is characterized in that described
The framed drift angle of core is chamfering or R corner structure, is equipped with interior gusset in the drift angle.
Described mold for shaping prefabricated thin-wall exhaust passage is characterized in that the described core of going up
Splay end limit in the framed openend of core bends inwards respectively and constitutes, the inboard connection of the side that is connected with interior splay end limit is provided with angle strut; Described core down
The framed openend of core is respectively the outside ramp structure that cooperates with inclined-plane, interior splay end limit, and inboard connection of the side that is connected with the inclined-plane is provided with down angle strut.
Described mold for shaping prefabricated thin-wall exhaust passage, it is characterized in that hinged cooperation the between Bian Mo and the bed die, mould arranged outside limit, limit mould fixed bar, drag link two ends respectively limit mould fixed bar connect and cooperate, wherein hinged cooperation of pull bar contiguous block of an end and the setting of mould fixed bar top, limit.
Described mold for shaping prefabricated thin-wall exhaust passage is characterized in that the bottom of described bed die is equipped with running wheel, and the bed die both sides are equipped with suspension ring.
Described mold for shaping prefabricated thin-wall exhaust passage is characterized in that comprising in the adventitia one or more cores that are made of upper and lower core cooperation, corresponding formation single hole element mold or porous member mould.
Described mold for shaping prefabricated thin-wall exhaust passage, it is characterized in that described folding and unfolding governor motion comprises adjusting screw(rod), termination top board, adjusting nut, interior adjusting nut, the adjusted in concert nut that is connected, the termination top board is fixedlyed connected with preceding center pull rod, the adjusting screw(rod) cross-under is on the top board of termination, fixedly connected interior adjusting nut, the adjusting nut that cooperates with termination top board striking on the adjusting screw(rod) of the inside and outside both sides of termination top board, adjusting screw(rod) the inner is spirally connected the adjusted in concert nut is set, and the adjusted in concert nut is put plate and rear center's pull bar is connected by drawing synchronously.
Described mold for shaping prefabricated thin-wall exhaust passage, the pulling-on piece that it is characterized in that connecting forward and backward center pull rod and left and right side pull bar is double-layer structure up and down, forward and backward center pull rod is provided with pulling-on piece up and down respectively by same pin and is connected with the left and right side pull bar.
Adopt above-mentioned mould, changed traditional form of construction work of exhaust duct, can realize the mechanization Mould operation, solve difficult problems such as unitary mould vibration moulding difficulty in the prefabricated square thin-wall member forming field, core dismounting inconvenience, the vertical failing load that can guarantee body is greater than 90kN, and the adjustable pipe body wall is thick as required, can reduce because of caused quality fluctuation of manual work and loss simultaneously, save the formed product and the time of making the product, save greatly and produce required place.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is an A-A sectional structure schematic diagram among Fig. 1;
Fig. 3 is a B-B sectional structure schematic diagram among Fig. 1;
Fig. 4 is another embodiment of the present invention structural representation.
Among the figure: the mould fixed bar of 1-limit, 2-limit mould, 3-end frame, 4-alignment pin, 5-bayonet socket, 6-upward cores, 6a-following core, 7-drag link, 8-core frame jack, 9-pull bar contiguous block, 10-core frame, 11-interior gusset, 12-folding and unfolding governor motion, 13-left side pull bar, 13a-right side pull bar, 14-pulling-on piece, 15-preceding center pull rod, 15a-rear center's pull bar, 16-interior splay end limit, 17-upward angle struts, 17a-following angle strut, 18-pin, 19-bed die, 20-running wheel, 21-synchronously draw and put plate, 22-adjusting screw(rod), 23-termination top board, 24-adjusted in concert nut, 25-suspension ring, 26-adjusting nut, 27-interior adjusting nut.
The specific embodiment
Now, describe the specific embodiment of the present invention in detail in conjunction with Figure of description:
Mold for shaping prefabricated thin-wall exhaust passage comprises adventitia and cooperates the core that constitutes by upper and lower core 6,6a that the die cavity two ends that core and adventitia constitute are equipped with end frame 3.Upper and lower core 6,6a respectively by
Core framed 10 cooperates formation with core frame jack 8,
The drift angle of core framed 10 is chamfering or R corner structure, can increase the shearing resistance of forming thin-walled member.Gusset 11 in being equipped with in the drift angle, about leave neutral gear between the gussets 11 in two, guarantee that 10 of core frames produce crooked at left and right sides fagging (10) neutral gear place; Last core 6
Splay end limit 16 in the openend of core framed 10 bends inwards respectively and constitutes, the bending angle on interior splay end limit 16 is 15-35 °, both can guarantee the straight and upright of side, can slip into smoothly when the demoulding again simultaneously in the following core 6a; Following core 6a's
The openend of core framed 10 is respectively the outside ramp structure that cooperates with 16 inclined-planes, interior splay end limit, the gradient on inclined-plane is as adopts 15-35 °, during support and the interior splay end limit 16 of last core 6 produces mutual interlock, prevent that cement mortar from bleeding in the core, produce mutual slippage during the demoulding simultaneously, core 6 can be slipped into down in the core 6a smoothly; The inboard connection of core frame 10 sides that last core 6 is connected with interior splay end limit 16 is provided with angle strut 17, the inboard connection of core frame 10 sides that following core 6a is connected with the inclined-plane is provided with down angle strut 17a, upper and lower angle strut 17,17a make the core frame 10 limit mouths of upper and lower core 6,6a well-pressed and straight respectively, even with the thickness that guarantees shaped component, prevent also that closure is not close and produce spillage, guarantee that the inside of member is bright and clean.
Described core frame jack 8 comprises left and right side pull bar 13,13a and forward and backward center pull rod 15, the 15a that is connected by one group of pulling-on piece 14, pulling-on piece 14 flexibly connects with left and right side pull bar 13,13a and forward and backward center pull rod 15,15a by pin 18 respectively, 14 one-tenth " V " shapes of two pulling-on pieces structure that preceding center pull rod 15 is connected with left and right side pull bar 13,13a, corresponding " V " shape structures of falling of 14 one-tenth of two pulling-on pieces that the pull bar 15a of rear center is connected with left and right side pull bar 13,13a, left and right side pull bar 13,13a respectively with
Framed 10 left and right sides inwalls of core are fixedly connected, and forward and backward center pull rod 15,15a are connected with folding and unfolding governor motion 12 respectively.Folding and unfolding governor motion 12 comprises adjusting screw(rod) 22, termination top board 23, adjusting nut 26, interior adjusting nut 27, the adjusted in concert nut 24 that is connected, termination top board 23 is fixedlyed connected with preceding center pull rod 15 by welding, adjusting screw(rod) 22 cross-under are on termination top board 23, fixedly connected interior adjusting nut 27, the adjusting nut 26 that cooperates with 23 strikings of termination top board on the adjusting screw(rod) 22 of termination top board 23 inside and outside both sides, adjusting screw(rod) 22 the inners are spirally connected adjusted in concert nut 24 are set, and adjusted in concert nut 24 is put plate 21 and is connected with the pull bar 15a of rear center by drawing synchronously.The adjusting nut 26 that turns clockwise, adjusting nut 26 top contact end crown plates 23 are moved to the left preceding center pull rod 15; Adjusted in concert nut 24 moves right on adjusting screw(rod) 22 simultaneously, put the plate 21 pulling pull bar 15a of rear center and move right by drawing synchronously, center pull rod 15, the pull bar 15a of rear center move to the center simultaneously promptly, and left and right side pull bar 13,13a are inwardly drawn in respectively.If be rotated counterclockwise adjusting nut 26, interior adjusting nut 27 top contact end crown plates 23 move right preceding center pull rod 15; Adjusted in concert nut 24 is moved to the left on adjusting screw(rod) 22 simultaneously, put plate 21 and promote the pull bar 15a of rear center and be moved to the left by drawing synchronously, center pull rod 15, the pull bar 15a of rear center move to two outer ends simultaneously promptly, and left and right side pull bar 13,13a are opened to both sides respectively.Open respectively or draw in by left and right side pull bar 13,13a, the open configuration that can adjust core frame 10 two sides carries out the formwork or the demoulding.
Described adventitia framed is upper opening
The shape structure, the limit mould 2 that is connected by bed die 19 and both sides constitutes, and the bottom of bed die 19 is equipped with running wheel 20, and both sides are equipped with suspension ring 25, are convenient to traction and lifting; Dual-side mould 2 lower ends respectively with 19 hinged cooperations of bed die, limit mould 2 arranged outside limit mould fixed bars 1, limit mould 2 is connected and fixed with limit mould fixed bar 1 by bayonet socket 5 and the alignment pin 4 that mould fixed bar 1 top, limit is provided with, dual-side mould fixed bar 1 upper end connects by the one group of drag link 7 that is provided with at interval and cooperates, 9 hinged cooperations of pull bar contiguous block that drag link 7 one ends and mould fixed bar 1 top, limit are provided with, the other end passes limit mould fixed bar 1 and uses fixed by nut.
For the prefabricated thin-wall exhaust passage that contains two or more through holes, the moulding process unanimity, in adventitia, comprise one or more cores that constitute by upper and lower core 6,6a cooperation during die assembly, corresponding formation single hole element mold or porous member mould, core is equipped with the end frame 3 consistent with the die cavity shape and structure with the die cavity two ends that adventitia constitutes.Figure 1 shows that the single hole mould, Fig. 4 is the diplopore mould.
The moulding process of using above-mentioned mold for shaping prefabricated thin-wall exhaust passage manufacturing exhaust duct may further comprise the steps:
1) die assembly, and, the mould that combines is hung traction track with the reinforcing bar of colligation moulding, the relevant position that electrowelding net sheet skeleton places mould, the traction by pulling equipment is dragged to the edge of table of shaking, and hangs on the platform that shakes fixing by lifting appliance again;
2) open shake table, casting cement mortar in above-mentioned mould, cement mortar is evenly enriched each space of being preset in the mould by vibration force in mould, and pour into an integrated entity with reinforcing bar, net sheet skeleton, the weight proportion of described cement mortar is a cement: 25%, sand: 74.5%, water reducer 0.5%
3) behind the casting complete, product and mold integral lift by crane on the track of curing kilns, and the cement mortar of upper surface is modified, and are trimmed to straight bright and clean back and by hauling machine product and mold integral are led the place of resting in the curing kilns, and rest 30 minutes;
4) product and mold integral are led maintenance place maintenance in the curing kilns, curing temperature after resting: 50～70 ℃, curing time: 5.0～7.0 hours;
5) after the step 4) maintenance, product and mold integral be drawn to cooling wait place cooling in the curing kilns, be 30 minutes cool time, carry out form removal then, go out to transport to open storage ground after product is split out and carry out natural curing from mould, the natural curing requirement of strength is 85-100%.
The die assembly process is: stile mould fixed bar 1 is propped up in the left and right sides on bed die 19, snaps in, fixing dual-side mould 2, at two ends or needed design length stiff end frame 3 again; With the reinforcing bar of colligation moulding, the relevant position that electrowelding net sheet skeleton places mould, will descend core 6a to put in the end frame 3 then, the adjusting screw(rod) 22 of rotation core frame jack 8 is adjusted core 6a down
The open configuration of core framed 10 makes core frame 10 sides and end frame 3 inner edge position consistency; From the core 6 that pushes suitable for reading, same core frame jack 8 is adjusted the open configuration of core frame 10 again, makes itself and end frame 3 inner edge position consistency; Last core 6, the tight sturdy cooperation of following core 6a constitute core.For two holes or the porous mold more than two holes, in adventitia, get final product by propping up upright core one by one by said process.
Its form removal process: the adjusting screw(rod) 22 of the core frame jack 8 of core 6 in the rotation, spurring forward and backward center pull rod 15,15a simultaneously moves to the inside, become " V " shape structure two pulling-on pieces 14 to close up to the center, pulling left and right side pull bar 13,13a inwardly are subjected to displacement, inwardly draw in core frame 10 both sides, upper end neutral gear between the gusset 11 in both sides produces crooked to upper process, last core 6 drops on down in the core 6a, can will go up core 6 and take out; By core 6a under core 6a core frame jack 8 draws in down, core 6a is shelved on the internal backplane of shaped component, thereby extracts out from the inside of type member easily again.
For the prefabricated thin-wall exhaust passage that contains two or more through holes, the moulding process unanimity, in adventitia, comprise one or more cores that constitute by upper and lower core 6,6a cooperation during die assembly, corresponding formation single hole element mold or porous member mould, core is equipped with the end frame 3 consistent with the die cavity shape and structure with the die cavity two ends that adventitia constitutes.
In the foregoing description, the weight proportion of cement mortar can be by cement: 17～31%, and sand: 68～82%, water reducer 0.4～0.6% is selected cooperation for use; Respectively can be in the curing kilns by 35～50 minutes time of resting at the place of resting, the curing temperature of maintenance place is that 50～70 ℃, curing time are 5.0～7.0 hours, be to select for use in 35-55 minutes the cool time of cooling wait place, can obtain same technique effect.
Claims (9)
1. mold for shaping prefabricated thin-wall exhaust passage comprises adventitia and cooperates the core that constitutes by upper and lower core (6,6a), it is characterized in that upper and lower core (6,6a) respectively by "
" core framed (10) cooperates formation with core frame jack (8), adventitia is framed to be "
" the shape structure, the limit mould (2) that is connected by bed die (19) and both sides constitutes, and dual-side mould (2) upper end connects by drag link (7) and cooperates, and the die cavity two ends that core and adventitia constitute are equipped with end frame (3).
2. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1, it is characterized in that described core frame jack (8) comprises a left side that is connected by one group of pulling-on piece (14), right side pull bar (13,13a) with before, rear center's pull bar (15,15a), pulling-on piece (14) is respectively by a pin (18) and a left side, right side pull bar (13,13a) and before, rear center's pull bar (15,15a) flexibly connect, preceding center pull rod (15,15a) with a left side, right side pull bar (13,13a) two pulling-on pieces (14) that connect become " V " shape structure, a rear center's pull bar (15a) and a left side, right side pull bar (13,13a) two pulling-on pieces (14) that connect become " V " shape structure, a left side, right side pull bar (13,13a) respectively with "
" core framed (10) left and right sides inwall is fixedly connected, forward and backward center pull rod (15,15a) is connected with folding and unfolding governor motion (12) respectively.
3. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1, it is characterized in that described "
" drift angle of core framed (10) is chamfering or R corner structure, is equipped with interior gusset (11) in the drift angle.
4. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1, it is characterized in that described go up core (6) "
" openend of core framed (10) bend inwards respectively and constitute in splay end limit (16), the inboard connection of the side that is connected with interior splay end limit (16) is provided with angle strut (17); Described core (6a) down "
" openend of core framed (10) is respectively the outside ramp structure that cooperates with inclined-plane, interior splay end limit (16), the inboard connection of the side that is connected with the inclined-plane is provided with down angle strut (17a).
5. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1, it is characterized in that hinged cooperation the between limit mould (2) and the bed die (19), limit mould (2) arranged outside limit mould fixed bar (1), drag link (7) two ends respectively limit mould fixed bars (1) connect and cooperate, wherein hinged cooperation of pull bar contiguous block (9) of an end and the setting of limit mould fixed bar (1) top.
6. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1 is characterized in that the bottom of described bed die (19) is equipped with running wheel (20), and bed die (19) both sides are equipped with suspension ring (25).
7. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 1 is characterized in that comprising in the adventitia and one or morely cooperates the core that constitutes, corresponding formation single hole element mold or porous member mould by upper and lower core (6,6a).
8. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 2, it is characterized in that described folding and unfolding governor motion (12) comprises the adjusting screw(rod) (22) that is connected, termination top board (23), adjusting nut (26), interior adjusting nut (27), adjusted in concert nut (24), termination top board (23) is fixedlyed connected with preceding center pull rod (15), adjusting screw(rod) (22) cross-under is on termination top board (23), the adjusting screw(rod) (22) of the inside and outside both sides of termination top board (23) is gone up the fixedly connected interior adjusting nut (27) that cooperates with termination top board (23) striking, adjusting nut (26), adjusting screw(rod) (22) the inner is spirally connected adjusted in concert nut (24) is set, and adjusted in concert nut (24) is put plate (21) and rear center's pull bar (15a) and is connected by drawing synchronously.
9. mold for shaping prefabricated thin-wall exhaust passage as claimed in claim 2, the pulling-on piece (14) that it is characterized in that connecting forward and backward center pull rod (15,15a) and left and right side pull bar (13,13a) is double-layer structure up and down, and forward and backward center pull rod (15,15a) is provided with pulling-on piece (14) and left and right side pull bar (13,13a) up and down respectively by same pin (18) and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100955609A CN101462300B (en) | 2009-01-22 | 2009-01-22 | Mold for shaping prefabricated thin-wall exhaust passage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100955609A CN101462300B (en) | 2009-01-22 | 2009-01-22 | Mold for shaping prefabricated thin-wall exhaust passage |
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| Publication Number | Publication Date |
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| CN101462300A true CN101462300A (en) | 2009-06-24 |
| CN101462300B CN101462300B (en) | 2011-03-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102658588A (en) * | 2012-05-09 | 2012-09-12 | 丁爱民 | Vertical grouting flue manufacturing equipment |
| CN102909780A (en) * | 2011-08-02 | 2013-02-06 | 郭庆红 | Mold for prefabricated thin-walled cement products |
| CN105397905A (en) * | 2015-12-21 | 2016-03-16 | 四川双铁科技有限公司 | Forming mold for upright column |
| CN106313285A (en) * | 2016-10-17 | 2017-01-11 | 魏张木 | Mold of prefabricated exhaust passage |
| CN110434987A (en) * | 2019-07-30 | 2019-11-12 | 济南硕厚建材科技有限公司 | A kind of pressure-bearing type exhaust gas flue mold |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87203179U (en) * | 1987-03-17 | 1988-01-13 | 陶元宝 | Hydraulic casket trunk machine |
| CN1078936A (en) * | 1992-05-21 | 1993-12-01 | 王作儒 | Walking type instant demoulding concrete drain pipe forming machine |
| CN2866074Y (en) * | 2005-11-08 | 2007-02-07 | 刘发清 | Hollow wallboard one-time forming mould |
| CN2830031Y (en) * | 2005-11-08 | 2006-10-25 | 刘发清 | Primary moulding die for producing hollowed wall slabs |
| CN201371501Y (en) * | 2009-01-22 | 2009-12-30 | 陈校兴 | Forming mould for prefabricating thin-wall exhaust channel |
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2009
- 2009-01-22 CN CN2009100955609A patent/CN101462300B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909780A (en) * | 2011-08-02 | 2013-02-06 | 郭庆红 | Mold for prefabricated thin-walled cement products |
| CN102909780B (en) * | 2011-08-02 | 2015-12-09 | 郭庆红 | Prefabricated thin-wall cement products mould |
| CN102658588A (en) * | 2012-05-09 | 2012-09-12 | 丁爱民 | Vertical grouting flue manufacturing equipment |
| CN105397905A (en) * | 2015-12-21 | 2016-03-16 | 四川双铁科技有限公司 | Forming mold for upright column |
| CN105397905B (en) * | 2015-12-21 | 2018-09-14 | 四川双铁科技有限公司 | A kind of column molding die |
| CN106313285A (en) * | 2016-10-17 | 2017-01-11 | 魏张木 | Mold of prefabricated exhaust passage |
| CN110434987A (en) * | 2019-07-30 | 2019-11-12 | 济南硕厚建材科技有限公司 | A kind of pressure-bearing type exhaust gas flue mold |
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|---|---|
| CN101462300B (en) | 2011-03-30 |
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Assignee: Sun Jiangshan| Ji Chengmeng Assignor: Chen Xiaoxing|Chen Nan|Wang Qiding Contract record no.: 2011500000061 Denomination of invention: Mold for shaping prefabricated thin-wall exhaust passage Granted publication date: 20110330 License type: Exclusive License Open date: 20090624 Record date: 20110927 |