CN109732039A - A kind of efficient sand mixer - Google Patents
A kind of efficient sand mixer Download PDFInfo
- Publication number
- CN109732039A CN109732039A CN201910077951.1A CN201910077951A CN109732039A CN 109732039 A CN109732039 A CN 109732039A CN 201910077951 A CN201910077951 A CN 201910077951A CN 109732039 A CN109732039 A CN 109732039A
- Authority
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- China
- Prior art keywords
- shift plate
- scraper
- rabbling mechanism
- support
- sand
- Prior art date
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Links
- 239000004576 sand Substances 0.000 title claims abstract description 85
- 230000007246 mechanism Effects 0.000 claims abstract description 67
- 230000000694 effects Effects 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000013019 agitation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 239000003110 molding sand Substances 0.000 abstract description 19
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008676 import Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000012257 stirred material Substances 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention proposes a kind of efficient sand mixers, including sand mixing thick tube, chassis sand mixing gear, eccentric rabbling mechanism, shift plate drives upper disk, shift plate supports lower wall, scraper shift plate component and upper dish driving mechanism, the bottom of the sand mixing thick tube is equipped with chassis sand mixing gear, auxiliary rabbling mechanism is provided on the chassis sand mixing gear, the bias rabbling mechanism includes the first rabbling mechanism and the second rabbling mechanism, the upper dish driving mechanism controls shift plate by gear driven mechanism and drives upper disk rotation, multiple the circumferentially-spaced of scraper shift plate component are distributed in sand mixing thick tube, the upper end of the scraper shift plate component, lower end is separately mounted to shift plate and drives on upper disk and shift plate support lower wall, the scraper shift plate component is equipped with the scraper plate for the cooperation that leans with sand mixing thick tube inner wall, it can shorten and be blended the time, improve mulling efficiency, and it can remove in time The molding sand in sand mixer inner walls is adhered to, guarantees that mulling is uniform.
Description
[technical field]
The present invention relates to the technical field of sand mixer, especially a kind of efficient sand mixer.
[background technique]
Equipment of the sand mixer as molding sand is blended, the use in foundary industry is very extensive, and traditional sand mixer is mixed
During sand, molding sand is often adhered on the inner wall of sand mixer shell, is blended unevenly, not can guarantee so as to cause molding sand
Molding sand is blended the standard for reaching required, influences the quality of molding sand, is unable to satisfy the needs of Foundry Production, while binder can also
Molding sand is bonded on the inner wall of sand mixer shell, then when unloading sand, possibly the molding sand being blended can not be drawn off completely, for a long time
Adhere on sand mixer shell, molding sand hardening after, removing from sand mixer shell just becomes unusual trouble, if without and
Shi Qingli can generate hard particles in molding sand, requirement is unable to satisfy, to also result in when carrying out mulling next time
The waste of molding sand resource, while some operators prevent molding sand from adhering on sand mixer shell by beating sand mixer shell,
It is easy to damage sand mixer in this way, influences the service life of sand mixer, existing sand mixer, during molding sand is blended, object
The mixability of material is extremely difficult to ideal effect, and sand mixer is blended that the time is long, unstable, and molding sand is blended low efficiency.Now propose
A kind of efficient sand mixer.
[summary of the invention]
The object of the invention is to solve the problems of the prior art, proposes a kind of efficient sand mixer, can shorten and be blended
Time improves mulling efficiency, and can remove the molding sand adhered in sand mixer inner walls in time, guarantees that mulling is uniform.
To achieve the above object, the invention proposes a kind of efficient sand mixer, including sand mixing thick tube, chassis sand mixing gear,
Eccentric rabbling mechanism, shift plate drive upper disk, shift plate support lower wall, scraper shift plate component and upper dish driving mechanism, the sand mixing thick tube
Bottom chassis sand mixing gear is installed, be provided on the chassis sand mixing gear several auxiliary rabbling mechanism, the auxiliary
Rabbling mechanism includes the first driving of the center convolution agitating shaft being installed on swivel base, two outer agitating shafts and driving swivel base rotation
Motor, the center convolution agitating shaft are installed at the center of swivel base, and the outer agitating shaft is symmetrically distributed in center convolution stirring
The two sides of axis, several stirring rod are equipped on the outer agitating shaft, and the bias rabbling mechanism is installed on the top cover of sand mixing thick tube
On, the bias rabbling mechanism includes the first rabbling mechanism and the second rabbling mechanism, and first rabbling mechanism and second stir
Mechanism is symmetrical set centered on center convolution agitating shaft, and the inner cavity of the sand mixing thick tube is disposed with first from top to bottom
Guide rail and the second supporting guide are supportted, the shift plate drives upper disk activity to be installed on the first supporting guide, the upper dish driving machine
Structure is set to the outside of sand mixing thick tube, and the upper dish driving mechanism controls shift plate by gear driven mechanism and upper disk is driven to rotate, institute
State shift plate support lower wall be movably installed on the second supporting guide, multiple scraper shift plate components it is circumferentially-spaced be distributed in it is mixed
In sand cylinder, upper end, the lower end of the scraper shift plate component are separately mounted to shift plate and drive on upper disk and shift plate support lower wall, described
Scraper shift plate component is equipped with the scraper plate for the cooperation that leans with sand mixing thick tube inner wall.
Preferably, first rabbling mechanism is identical as the structure of the second rabbling mechanism, first rabbling mechanism
Long paddle group and short paddle group are arranged at intervals in shaft, the long paddle group is circumferentially set in shaft by 3-5
Long paddle composition, the short paddle group is made of the 3-5 short paddle that is set in shaft of circumferential direction, the outer stirring
The distance between axis and heart screw agitation shaft are greater than the distance between the first rabbling mechanism and heart screw agitation shaft.
Preferably, it further includes the first support base, driven tooth, upper mounting seat that the shift plate, which drives upper disk, the shift plate is driven
The outer ring of dynamic upper disk is equipped with the first support base, and the lower end of first support base is equipped with the installed with the first supporting guide activity
One slide, the periphery of first support base are equipped with the driven tooth being meshed with gear driven mechanism, and the shift plate drives upper disk
Inner ring be symmetrically arranged with two upper mounting seats, U-lag is equipped in the upper mounting seat, the upper end of the scraper shift plate component clamps
In U-lag, the shift plate, which drives, to be connected between upper disk, shift plate support lower wall by least two connecting rods.
Preferably, the shift plate support lower wall includes the second support base and lower mounting seat well, the shift plate supports lower wall
Outer ring the second support base is installed, the lower end of second support base is equipped with the second cunning install with the second supporting guide activity
The inner wall of seat, the shift plate support lower wall is symmetrically arranged with lower mounting seat corresponding with upper mounting seat, sets in the lower mounting seat
There is limit slot, the cross sectional shape of the limit slot is circle, and the top of the limit slot, which is equipped with, imports cone chamber, described to scrape
The lower end of material shift plate component is installed in limit slot.
Preferably, the scraper shift plate component further includes support rod, fixing seat, elastic telescopic bracket, scraper plate support plate,
The top of the support rod, which is equipped with, runs through U-lag, and the top of the support rod is equipped with fixing seat, and the fixing seat passes through fastener
It is fixed on the top of upper mounting seat, the upper mounting seat is equipped with the mounting hole matched with fastener, under the support rod
Portion is installed in limit slot, is connected between the support rod and scraper plate support plate by several elastic telescopic brackets, described
Scraper plate is mounted in scraper plate support plate.
Preferably, the upper dish driving mechanism further includes the second motor for driving gear driven mechanism.
Preferably, the inner cavity of the sand mixing thick tube is disposed with the first mounting groove and the second mounting groove, institute from top to bottom
It states the first supporting guide and the second supporting guide is respectively arranged in the first mounting groove and the second mounting groove.
It is equipped between upper disk, the outer wall of shift plate support lower wall and the inner wall of sand mixing thick tube preferably, the shift plate drives
Several sealing elements.
Beneficial effects of the present invention: the present invention drives upper disk, shift plate by sand mixing thick tube, mulling motor, rabbling mechanism, shift plate
The cooperation of lower wall, scraper shift plate component and upper dish driving mechanism etc. is supported, eccentric rabbling mechanism, which is stirred material, to be blended, and two
A outer agitating shaft can mix the material of sand mixing thick tube inner circumferential, can shorten and be blended the time, improve mulling efficiency, and pass through
Shift plate drives upper disk, shift plate support lower wall that scraper shift plate component can be driven to rotate, and elastic telescopic bracket can guarantee that scraper is dialled
Board group part is resisted against the inner wall of sand mixing thick tube always, the molding sand adhered in sand mixer inner walls can be removed in time, to keep away
Exempt from molding sand waste, energy-saving sand resource, and can also ensure that mulling is uniform, wherein scraper shift plate component is using detachable knot
Structure, it is easy to disassemble to be cleared up.
Feature and advantage of the invention will be described in detail by embodiment combination attached drawing.
[Detailed description of the invention]
Fig. 1 is a kind of schematic diagram of internal structure of efficient sand mixer of the present invention；
Fig. 2 is the partial sectional schematic view that a kind of shift plate of efficient sand mixer of the present invention drives upper disk；
Fig. 3 is a kind of partial sectional schematic view of the shift plate support lower wall of efficient sand mixer of the present invention；
Fig. 4 is a kind of schematic top plan view of the upper mounting seat of efficient sand mixer of the present invention；
Fig. 5 is a kind of schematic top plan view of the lower mounting seat of efficient sand mixer of the present invention；
Fig. 6 is a kind of structural schematic diagram of the upper dish driving mechanism of efficient sand mixer of the present invention；
Fig. 7 is a kind of overlooking structure diagram of the swivel base of efficient sand mixer of the present invention.
[specific embodiment]
Refering to fig. 1 to a kind of efficient sand mixer of Fig. 7 present invention, including sand mixing thick tube 1, chassis sand mixing gear 2, eccentric stirring
Mechanism 3, shift plate drive upper disk 4, shift plate support lower wall 5, scraper shift plate component 6 and upper dish driving mechanism 7, the sand mixing thick tube 1
Bottom is equipped with chassis sand mixing gear 2, several auxiliary rabbling mechanisms, the auxiliary are provided on the chassis sand mixing gear 2
Rabbling mechanism includes that 23, the two outer agitating shafts 24 of center convolution agitating shaft being installed on swivel base 22 and driving swivel base 22 rotate
First driving motor 21, the center convolution agitating shaft 23 are installed at the center of swivel base 22, and the outer agitating shaft 24 symmetrically divides
The two sides of center convolution agitating shaft 23 are distributed in, several stirring rod, the bias blender are installed on the outer agitating shaft 24
Structure 3 is installed on the top cover of sand mixing thick tube 1, and the bias rabbling mechanism 3 includes the first rabbling mechanism 31 and the second rabbling mechanism 32,
First rabbling mechanism 31 and the second rabbling mechanism 32 are symmetrical set centered on center convolution agitating shaft 23, the mulling
The inner cavity of cylinder 1 is disposed with the first supporting guide 11 and the second supporting guide 12 from top to bottom, and the shift plate drives upper disk 4 living
Dynamic to be installed on the first supporting guide 11, the upper dish driving mechanism 7 is set to the outside of sand mixing thick tube 1, the upper dish driving machine
Structure 7 controls shift plate by gear driven mechanism 72 and upper disk 4 is driven to rotate, and the shift plate support lower wall 5 is movably installed in second
It supports on guide rail 12, multiple the circumferentially-spaced of scraper shift plate component 6 are distributed in sand mixing thick tube 1, the scraper shift plate component 6
Upper end, lower end are separately mounted to shift plate and drive on upper disk 4 and shift plate support lower wall 5, and the scraper shift plate component 6 is equipped with and mixes
1 inner wall of sand cylinder leans the scraper plate 65 of cooperation.First rabbling mechanism 31 is identical as the structure of the second rabbling mechanism 32, described
Long paddle group 311 and short paddle group 312, the long paddle group are arranged at intervals in the shaft of first rabbling mechanism 31
311 are made of the 3-5 circumferential long paddle being set in shaft, and the short paddle group 312 is turned by 3-5 circumferential be set to
Short paddle composition on axis, the distance between the outer agitating shaft 24 and heart screw agitation shaft 23 are greater than the first rabbling mechanism 31
The distance between heart screw agitation shaft 23.It further includes the first support base 41, driven tooth 42, upper peace that the shift plate, which drives upper disk 4,
Fill seat 43, the shift plate drives the outer ring of upper disk 4 to be equipped with the first support base 41, and the lower end of first support base 41 is equipped with and the
The first slide 411 of one supporting guide, 11 activity installation, the periphery of first support base 41 is equipped with and gear driven mechanism 72
The driven tooth 42 being meshed, the shift plate drive the inner ring of upper disk 4 to be symmetrically arranged with two upper mounting seats 43, the upper mounting seat 43
Interior to be equipped with U-lag 431, the upper end of the scraper shift plate component 6 is installed in U-lag 431, and the shift plate drives upper disk 4, shift plate
It supports and is connected between lower wall 5 by least two connecting rods 400.The shift plate support lower wall 5 includes 51 He of the second support base well
The outer ring of lower mounting seat 52, the shift plate support lower wall 5 is equipped with the second support base 51, and the lower end of second support base 51 is set
There is the second slide 511 with the 12 activity installation of the second supporting guide, the inner wall of the shift plate support lower wall 5 is symmetrically arranged with and upper peace
The corresponding lower mounting seat 52 of seat 43 is filled, limit slot 521 is equipped in the lower mounting seat 52, the limit slot 521 is cut
Face shape is circle, and the top of the limit slot 521, which is equipped with, imports cone chamber 522, and the lower end of the scraper shift plate component 6 clamps
In limit slot 521.The scraper shift plate component 6 further includes support rod 61, fixing seat 62, elastic telescopic bracket 63, scraper plate
Support plate 64, the top of the support rod 61, which is equipped with, runs through U-lag 431, and the top of the support rod 61 is equipped with fixing seat 62, institute
The top that fixing seat 62 is fixed on upper mounting seat 43 by fastener 620 is stated, the upper mounting seat 43 is equipped with and fastener 620
The mounting hole 40 matched, the lower part of the support rod 61 are installed in limit slot 521, and the support rod 61 is supported with scraper plate
It is connected between plate 64 by several elastic telescopic brackets 63, the scraper plate 65 is mounted in scraper plate support plate 64.The upper disk
Driving mechanism 7 further includes the second motor 71 for driving gear driven mechanism 72.The inner cavity of the sand mixing thick tube 1 from top to bottom according to
Secondary to be provided with the first mounting groove and the second mounting groove, first supporting guide 11 and the second supporting guide 12 are respectively arranged in
In one mounting groove and the second mounting groove.The shift plate drive upper disk 4, the outer wall of shift plate support lower wall 5 and sand mixing thick tube 1 inner wall it
Between several sealing elements are installed.
The course of work of the present invention:
A kind of efficient sand mixer of the present invention, eccentric rabbling mechanism 3, which is stirred material, to be blended, two outer agitating shaft energy
It is enough that the material of 1 inner circumferential of sand mixing thick tube is mixed, can shorten and be blended the time, improve mulling efficiency, during being blended can between
It has a rest and opens motor 71, drive upper disk 4, shift plate that lower wall 5 is supported to rotate synchronously by shift plate, 6 turns of scraper shift plate component can be driven
Dynamic, elastic telescopic bracket 63 can guarantee that scraper plate 65 is resisted against the inner wall of sand mixing thick tube 1 always, can remove in time and adhere to mulling
Molding sand in machine inner walls, so that molding sand is avoided to waste, energy-saving sand resource, and can also ensure that mulling is uniform, wherein
Scraper shift plate component 6 uses detachable structure, easy to disassemble to be cleared up, and when needing to clean scraper shift plate component 6, first will
Fastener 620 is removed from fixing seat 62, then pulls out scraper shift plate component 6 upwards, and the lower end of support rod 61 is made to be detached from limit
Slot 521, then pulling out 61 top of support rod and being detached from U-lag 431 can be removed and cleared up, and complete general after cleaning
The lower end of support rod 61 is inserted into limit slot 521, and top snaps onto U-lag 431, is finally carried out using fastener 620
Fixation.
Above-described embodiment is the description of the invention, is not limitation of the invention, after any pair of simple transformation of the present invention
Scheme all belong to the scope of protection of the present invention.
Claims (5)
1. a kind of efficient sand mixer, it is characterised in that: including sand mixing thick tube (1), chassis sand mixing gear (2), eccentric rabbling mechanism
(3), shift plate drives upper disk (4), shift plate support lower wall (5), scraper shift plate component (6) and upper dish driving mechanism (7), the mulling
The bottom of cylinder (1) is equipped with chassis sand mixing gear (2), several auxiliary blenders are provided on the chassis sand mixing gear (2)
Structure, the auxiliary rabbling mechanism includes the center convolution agitating shaft (23) being installed on swivel base (22), two outer agitating shafts (24)
With the first driving motor (21) of driving swivel base (22) rotation, the center convolution agitating shaft (23) is installed in swivel base (22)
At the heart, the outer agitating shaft (24) is symmetrically distributed in the two sides of center convolution agitating shaft (23), pacifies on the outer agitating shaft (24)
Equipped with several stirring rod, the bias rabbling mechanism (3) is installed on the top cover of sand mixing thick tube (1), the bias rabbling mechanism
It (3) include the first rabbling mechanism (31) and the second rabbling mechanism (32), first rabbling mechanism (31) and the second rabbling mechanism
(32) it is symmetrical set centered on center convolution agitating shaft (23), the inner cavity of the sand mixing thick tube (1) is set gradually from top to bottom
There are the first supporting guide (11) and the second supporting guide (12), the shift plate drives upper disk (4) to be movably installed in the first support and leads
On rail (11), the upper dish driving mechanism (7) is set to the outside of sand mixing thick tube (1), and the upper dish driving mechanism (7) passes through gear
Driving mechanism (72) controls shift plate and drives upper disk (4) rotation, and shift plate support lower wall (5) is movably installed in the second supporting guide
(12) on, the circumferentially-spaced of multiple scraper shift plate components (6) is distributed in sand mixing thick tube (1), the scraper shift plate component (6)
Upper end, lower end be separately mounted to shift plate and upper disk (4) and shift plate driven to support on lower wall (5), on the scraper shift plate component (6)
Scraper plate (65) equipped with the cooperation that leans with sand mixing thick tube (1) inner wall.
2. a kind of efficient sand mixer as described in claim 1, it is characterised in that: first rabbling mechanism (31) and second
The structure of rabbling mechanism (32) is identical, and long paddle group (311) is arranged at intervals in the shaft of first rabbling mechanism (31)
With short paddle group (312), the long paddle group (311) is made of the 3-5 circumferential long paddle being set in shaft, institute
It states short paddle group (312) to be made of the 3-5 circumferential short paddle being set in shaft, the outer agitating shaft (24) and heart spiral shell
It revolves the distance between agitating shaft (23) and is greater than the distance between the first rabbling mechanism (31) and heart screw agitation shaft (23).
3. a kind of efficient sand mixer as described in claim 1, it is characterised in that: disk (4) further include in the shift plate driving
First support base (41), driven tooth (42), upper mounting seat (43), the shift plate drive the outer ring of upper disk (4) to be equipped with the first support
Seat (41), the lower end of first support base (41) are equipped with the first slide (411) with the first supporting guide (11) activity installation,
The periphery of first support base (41) is equipped with the driven tooth (42) being meshed with gear driven mechanism (72), the shift plate driving
The inner ring of upper disk (4) is symmetrically arranged with two upper mounting seats (43), is equipped with U-lag (431) in the upper mounting seat (43), described to scrape
The upper end of material shift plate component (6) is installed in U-lag (431), and the shift plate drives between upper disk (4), shift plate support lower wall (5)
It is connected by least two connecting rods (400).
4. a kind of efficient sand mixer as claimed in claim 3, it is characterised in that: shift plate support lower wall (5) includes well
The outer ring of second support base (51) and lower mounting seat (52), shift plate support lower wall (5) is equipped with the second support base (51), institute
The lower end for stating the second support base (51) is equipped with the second slide (511) installed with the second supporting guide (12) activity, the shift plate
The inner wall of support lower wall (5) is symmetrically arranged with lower mounting seat (52) corresponding with upper mounting seat (43), the lower mounting seat (52)
Interior to be equipped with limit slot (521), the cross sectional shape of limit slot (521) is circle, the top of limit slot (521)
Chamber (522) are bored equipped with importing, the lower end of the scraper shift plate component (6) is installed in limit slot (521).
5. a kind of efficient sand mixer as claimed in claim 4, it is characterised in that: the scraper shift plate component (6) further includes
The top of support rod (61), fixing seat (62), elastic telescopic bracket (63), scraper plate support plate (64), the support rod (61) is set
Have through U-lag (431), the top of the support rod (61) is equipped with fixing seat (62), and the fixing seat (62) passes through fastener
(620) it is fixed on the top of upper mounting seat (43), the upper mounting seat (43) is equipped with the installation matched with fastener (620)
Hole (40), the lower part of the support rod (61) are installed in limit slot (521), the support rod (61) and scraper plate support plate
(64) it is connected between by several elastic telescopic brackets (63), the scraper plate (65) is mounted on scraper plate support plate (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910077951.1A CN109732039B (en) | 2019-01-28 | 2019-01-28 | Efficient sand mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910077951.1A CN109732039B (en) | 2019-01-28 | 2019-01-28 | Efficient sand mixer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109732039A true CN109732039A (en) | 2019-05-10 |
| CN109732039B CN109732039B (en) | 2024-04-12 |
Family
ID=66366365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910077951.1A Active CN109732039B (en) | 2019-01-28 | 2019-01-28 | Efficient sand mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109732039B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110421117A (en) * | 2019-07-30 | 2019-11-08 | 天津众达精密机械有限公司 | A kind of machining production sand mixer |
| CN110560630A (en) * | 2019-09-16 | 2019-12-13 | 溧阳市新明机械配件制造有限公司 | Roller mill with clear material mechanism |
| CN110788274A (en) * | 2019-12-20 | 2020-02-14 | 安徽宏华铸造有限公司 | Quick sand mixer for casting |
| CN112808928A (en) * | 2020-12-31 | 2021-05-18 | 亚威机械制造(徐州)有限公司 | Sand mixer for manufacturing novel precoated sand |
| CN114101579A (en) * | 2021-12-01 | 2022-03-01 | 创发科技(泰兴)有限公司 | Labor-saving and efficient sand mixer and using method |
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| CN110421117A (en) * | 2019-07-30 | 2019-11-08 | 天津众达精密机械有限公司 | A kind of machining production sand mixer |
| CN110560630A (en) * | 2019-09-16 | 2019-12-13 | 溧阳市新明机械配件制造有限公司 | Roller mill with clear material mechanism |
| CN110788274A (en) * | 2019-12-20 | 2020-02-14 | 安徽宏华铸造有限公司 | Quick sand mixer for casting |
| CN112808928A (en) * | 2020-12-31 | 2021-05-18 | 亚威机械制造(徐州)有限公司 | Sand mixer for manufacturing novel precoated sand |
| CN112808928B (en) * | 2020-12-31 | 2022-09-09 | 江苏亚威铸造材料科技有限公司 | A roller mill for making tectorial membrane sand |
| CN114101579A (en) * | 2021-12-01 | 2022-03-01 | 创发科技(泰兴)有限公司 | Labor-saving and efficient sand mixer and using method |
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