CN106984383A - A kind of Paper-faced gyp paperboard, core separation equipment - Google Patents
A kind of Paper-faced gyp paperboard, core separation equipment Download PDFInfo
- Publication number
- CN106984383A CN106984383A CN201710255809.2A CN201710255809A CN106984383A CN 106984383 A CN106984383 A CN 106984383A CN 201710255809 A CN201710255809 A CN 201710255809A CN 106984383 A CN106984383 A CN 106984383A
- Authority
- CN
- China
- Prior art keywords
- pressure roller
- paper
- puncture
- paperboard
- support frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
- B02C2023/165—Screen denying egress of oversize material
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Paper (AREA)
Abstract
The present invention discloses a kind of Paper-faced gyp paperboard, core separation equipment, the mask paper on waste product relatively easily can be separated into raising waste recovery with plate core and utilize efficiency.Including support frame, gravity pressure roller, puncture pressure roller, screen cloth and power motor；Gravity pressure roller and puncture pressure roller at least include two, and two gravity pressure rollers are the smooth roll shaft in surface；The surface of puncture pressure roller is equipped with the projection for the paper on Thistle board to be punctured；Support frame is that rectangular double-layer supporting plate structure gravity pressure roller is embedded and pressure roller is punctured on the upper strata of support frame is embedded lower floor in support frame, and the central shaft of gravity pressure roller and puncture pressure roller is parallel with the table top of support frame；Power motor is located on the extending bracket for puncturing pressure roller side, and screen cloth is located at the underface for puncturing pressure roller；In the vertical direction, a gravity pressure roller and a puncture pressure roller constitute a pair of transmission groups, and the two is connected by driving chain, drive driving chain by power motor and then drive gravity pressure roller and puncture pressure roller to rotate.
Description
Technical field
The invention belongs to plaster board production equipment field, and in particular to a kind of Paper-faced gyp paperboard, core separation equipment.
Background technology
The waste product that gypsum lath product line is produced is consistent with the chemical composition that production line is raw materials used, is sulfate dihydrate
Calcium.Therefore, the waste product that production line is produced still mixes calcining in raw gypsum and used after being crushed.But because waste product plasterboard has just
Face, two layers of back side mask paper, after broken, will generally sieve and screen out the mask paper scraps of paper.And when broken, because of two layers of mask paper and plate
The combination of core gypsum is closer, and most of paper will not be separated with gypsum core, and causes it to be mixed into after screening in the land plaster of gained,
The follow-up addition of influence is used.
There is waste recovery system to be directed to this Resolving probiems at present, still, however it remains not enough：Plate core can not be with mask paper
It is kept completely separate, when causing the raw material to calcine, negative pressure keeps bad, calcinating consumption increase.Land plaster containing paper do coagulant in use, because
Paper is present, and causing coagulant to promote, solidifying effect is not good, and the solidifying effect of rush declines.
The content of the invention
It is an object of the invention to provide a kind of Paper-faced gyp paperboard, core separation equipment, can relatively easily in advance will
Paper on waste product is separated with plasterboard plate core, is improved waste recovery and is utilized efficiency, saves raw materials for production.
In order to achieve the above object, concrete technical scheme of the invention is as follows：
A kind of Paper-faced gyp paperboard, core separation equipment, including：Support frame, gravity pressure roller, puncture pressure roller, screen cloth and power
Motor；
The gravity pressure roller and puncture pressure roller at least include two, and two gravity pressure rollers are the smooth roller in surface
Axle；The surface for puncturing pressure roller is equipped with the projection for the paper on Thistle board to be punctured；
Support frame as described above is rectangular double-layer supporting plate structure, and the gravity pressure roller is embedded on the upper strata of support frame as described above, institute
State and puncture pressure roller and be embedded lower floor in support frame as described above, the central shaft of the gravity pressure roller and the puncture pressure roller with the branch
The table top of support is parallel；The power motor is located on the extending bracket of the puncture pressure roller side, and the screen cloth is located at described
Puncture the underface of pressure roller；
In the vertical direction, a gravity pressure roller and a pressure roller that punctures constitute a pair of transmission groups, and the two leads to
Driving chain connection is crossed, the driving chain is driven by the power motor and then the gravity pressure roller and the puncture is driven
Pressure roller is rotated.
Further, the projection that the puncture roller surface is set is times in triangle, circular or irregular shape
The combination of one or more identical or different shapes.
Further, the distance of shaft centers being equipped with each pressure roller between distance of shaft centers regulating member, two pressure rollers of identical leads to
Cross the distance of shaft centers regulating member regulation.
Further, the distance of shaft centers regulating member is included in the described two pressure roller two ends of identical and sets long screw respectively
Coordinate fixing bolt, be that can adjust the distance of shaft centers between two pressure rollers by adjusting the position of a pressure roller.
Further, the mesh size of the screen cloth is at least above the particle diameter of the plasterboard powder after crushing, the stone after sub-sieve
Cream paperboard is stayed on the screen cloth.
Further, the two ends of the screen cloth are provided with shock club, and the shock club is connected with the power motor.
Further, the lower section of the screen cloth is provided with the collection device for collecting the plasterboard powder fallen.
Further, the collection device is rewinding mouth and Material collecting box for harvesting, and the rewinding mouth is bell shape, is located at described
The lower section of screen cloth, its maximum caliber is equal to or more than the width of the screen cloth, the bore smallest end of the rewinding mouth and the collection
Hopper is connected, and the Material collecting box for harvesting is the closed box that upper end is provided with opening.
A kind of Paper-faced gyp paperboard, core separation equipment that the present invention is provided, are crushed Thistle board by gravity pressure roller,
Followed by thoroughly puncture fragmentation by puncturing pressure roller by the paper for remaining in plasterboard fractal surfaces, afterwards by screen cloth to it
Sieved, mask paper and plate core can be so completely separated, final reclaim obtains pure plasterboard powder, improves waste material
The efficiency of recovery.
Brief description of the drawings
Fig. 1 is a kind of Paper-faced gyp paperboard of the invention provided, the structural representation of core separation equipment；
1. support frame, 2. gravity pressure rollers, 3. puncture pressure roller, 4. screen clothes, 5. power motors.
Embodiment
Embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of Paper-faced gyp paperboard, core separation equipment, including：Support frame 1, gravity pressure roller 2, puncture pressure roller
3rd, screen cloth 4 and power motor 5；
The gravity pressure roller 2 and puncture pressure roller 3 at least include two, and two gravity pressure rollers 2 are that surface is smooth
Roll shaft；The surface for puncturing pressure roller 3 is equipped with the projection for the paper on Thistle board to be punctured；
Support frame as described above 1 is rectangular double-layer supporting plate structure, and the gravity pressure roller 2 is embedded on the upper strata of support frame as described above 1,
The pressure roller 3 that punctures is embedded lower floor in support frame as described above 1, the gravity pressure roller 2 and the central shaft for puncturing pressure roller 3 with
The table top of support frame as described above 1 is parallel；The power motor 5 is located on the extending bracket of puncture pressure roller 3 side, the screen cloth
4 are located at the underface of the puncture pressure roller 3；
In the vertical direction, a gravity pressure roller 2 and a pressure roller 3 that punctures constitute a pair of transmission groups, the two
Connected by driving chain, the driving chain is driven by the power motor 5 and then the gravity pressure roller 2 is driven and described
Pressure roller 3 is punctured to rotate.
During operation, adjacent two gravity pressure rollers 2 and two puncture pressure rollers are respectively relatively rotated, and to be comminuted is discarded
The feeding mouth that plasterboard is first sent between two gravity pressure rollers 2, is crushed, enter back into afterwards the two puncture pressure rollers 3 in lower section it
Between unbroken mask paper is crushed, while also can be by unbroken block plasterboard separating twice, finally by screen cloth 4 by stone
Cream plate powder and large stretch of plasterboard and scraps of paper sub-sieve, the higher plasterboard powder of degree of purity is reclaimed.
Wherein described the raised of the surface of pressure roller 3 setting that puncture can be appointing in triangle, circular or irregular shape
The combination of one or more identical or different shapes.
In order to, make to enter paper according to actual needs, the Thistle board fragment of plate piece-rate system is fully broken, can be with
Adjust and distance of shaft centers regulation is equipped with the distance of shaft centers between two gravity pressure rollers 2 or two puncture pressure rollers 3, preferably each pressure roller
Distance of shaft centers between part, two pressure rollers of identical is adjusted by the distance of shaft centers regulating member.
For the distance of shaft centers regulation of identical two pressure rollers, the available any method and structure portion in current this area can be used
Part is adjusted, and preferably described distance of shaft centers regulating member is included in the described two pressure roller two ends of identical and sets long screw to match somebody with somebody respectively
Fixing bolt is closed, is that can adjust the distance of shaft centers between two pressure rollers by adjusting the position of a pressure roller.It can also be the axle
The heart is that long screw is set on one of which pressure roller away from regulating member, sets nut on another described pressure roller, the two is matched somebody with somebody
Close the distance of shaft centers between two pressure rollers of regulation.
For the degree of purity of the plasterboard powder that improves recovery, after the mesh size of preferably described screen cloth 4 is at least above crushing
Plasterboard powder particle diameter, the gypsum paperboard after sub-sieve stayed on the screen cloth 4.
In order to improve the rate of recovery of plasterboard powder, preferably shock club, the shock club can be set at the two ends of the screen cloth 4
It is connected, is shaken while sieving, it is ensured that the plasterboard powder of separation can be sized recovery with the power motor 5.
The collection device for collecting the plasterboard powder fallen can be set in the lower section of the screen cloth 4.
Set for convenience, preferably described collection device is rewinding mouth and Material collecting box for harvesting, the rewinding mouth is bell shape,
The lower section of the screen cloth 4 is located at, its maximum caliber is equal to or more than the width of the screen cloth 4, and the bore of the rewinding mouth is minimum
End is connected with the Material collecting box for harvesting, and the Material collecting box for harvesting is the closed box that upper end is provided with opening.
More than, although several embodiments of the invention is illustrated, but these embodiments are intended only as example proposition
, it is not intended to limit the scope of the present invention.For these new embodiments, it can be implemented in other various modes,
In the range of idea of the invention is not departed from, various omissions, displacement can be carried out and changed.These embodiments and its change
Shape, the invention being also contained in described in claims while being contained in scope and spirit of the present invention and its impartial model
In enclosing.
Claims (8)
1. a kind of Paper-faced gyp paperboard, core separation equipment, it is characterised in that including：Support frame, gravity pressure roller, puncture pressure roller, sieve
Net and power motor；
The gravity pressure roller and puncture pressure roller at least include two, and two gravity pressure rollers are the smooth roll shaft in surface；
The surface for puncturing pressure roller is equipped with the projection for the paper on Thistle board to be punctured；
Support frame as described above is rectangular double-layer supporting plate structure, and the gravity pressure roller is embedded on the upper strata of support frame as described above, described to wear
Thorn pressure roller is embedded lower floor in support frame as described above, and the central shaft of the gravity pressure roller and the puncture pressure roller is and support frame as described above
Table top it is parallel；The power motor is located on the extending bracket of the puncture pressure roller side, and the screen cloth is located at the puncture
The underface of pressure roller；
In the vertical direction, a gravity pressure roller and a pressure roller that punctures constitute a pair of transmission groups, and the two is by passing
Dynamic chain connection, drives the driving chain by the power motor and then drives the gravity pressure roller and the puncture pressure roller
Rotate.
2. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 1, it is characterised in that the puncture pressure roller table
The projection that face is set is the combination of any of triangle, circular or irregular shape or a variety of identical or different shapes.
3. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 1, it is characterised in that be all provided with each pressure roller
There is the distance of shaft centers between distance of shaft centers regulating member, two pressure rollers of identical to be adjusted by the distance of shaft centers regulating member.
4. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 3, it is characterised in that the distance of shaft centers regulation
Part is included in the described two pressure roller two ends of identical and sets long screw to coordinate fixing bolt respectively, passes through one pressure roller of regulation
Position is that can adjust the distance of shaft centers between two pressure rollers.
5. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 1, it is characterised in that the mesh of the screen cloth
Size is at least above the particle diameter of the plasterboard powder after crushing, and the gypsum paperboard after sub-sieve stayed on the screen cloth.
6. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 1, it is characterised in that the two ends of the screen cloth
Provided with shock club, the shock club is connected with the power motor.
7. a kind of Paper-faced gyp paperboard, core separation equipment as claimed in claim 1, it is characterised in that the lower section of the screen cloth
Provided with the collection device for collecting the plasterboard powder fallen.
8. as claimed in claim 7 a kind of Paper-faced gyp paperboard, core separation equipment, it is characterised in that the collection device is
Rewinding mouth and Material collecting box for harvesting, the rewinding mouth are bell shape, are located at the lower section of the screen cloth, its maximum caliber is equal to or more than
The width of the screen cloth, the bore smallest end of the rewinding mouth is connected with the Material collecting box for harvesting, and the Material collecting box for harvesting is provided with for upper end and opened
The closed box of mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710255809.2A CN106984383A (en) | 2017-04-19 | 2017-04-19 | A kind of Paper-faced gyp paperboard, core separation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710255809.2A CN106984383A (en) | 2017-04-19 | 2017-04-19 | A kind of Paper-faced gyp paperboard, core separation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106984383A true CN106984383A (en) | 2017-07-28 |
Family
ID=59415263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710255809.2A Pending CN106984383A (en) | 2017-04-19 | 2017-04-19 | A kind of Paper-faced gyp paperboard, core separation equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106984383A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108993858A (en) * | 2018-06-22 | 2018-12-14 | 宁波北新建材有限公司 | A kind of separation system of Novel gypsum board mask paper and gypsum |
| CN110788117A (en) * | 2019-10-31 | 2020-02-14 | 太仓北新建材有限公司 | Automatic paper device about separation waste board |
| CN111644230A (en) * | 2020-05-07 | 2020-09-11 | 江苏营特泰克智能环保设备有限公司 | A paper powder separating centrifuge for $ fitting up useless gypsum board in rubbish and handle |
| CN112264428A (en) * | 2020-09-29 | 2021-01-26 | 田洪梅 | Recovery unit of thistle board with locating component |
| CN113231433A (en) * | 2021-04-01 | 2021-08-10 | 郑州工业应用技术学院 | Dust device for civil engineering |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1080645A (en) * | 1996-09-06 | 1998-03-31 | Synx Kk | Device for crushing waste building material |
| JP2001137726A (en) * | 1999-11-16 | 2001-05-22 | Minoru Hosoda | Gypsum board grinding and fractionating treatment apparatus |
| CN201625547U (en) * | 2009-12-23 | 2010-11-10 | 江门市科恒实业股份有限公司 | Novel roller-type breaker |
| CN202290149U (en) * | 2011-10-27 | 2012-07-04 | 江油晟达机电装备有限责任公司 | Novel no-blockage two-level tooth-roller crusher |
| US8511591B1 (en) * | 2012-01-31 | 2013-08-20 | SDF Recycling, LLC. | System and method for separating and recycling multi-layered construction panels |
| CN104707702A (en) * | 2013-12-12 | 2015-06-17 | 北新集团建材股份有限公司 | Recovery and treatment method and device of gypsum plaster board |
| CN205182832U (en) * | 2015-11-29 | 2016-04-27 | 王天宝 | Ability automatic feed's high -efficient ore crusher |
| CN205628100U (en) * | 2016-04-26 | 2016-10-12 | 江苏省冶金设计院有限公司 | Four -roller crusher |
| CN206064803U (en) * | 2016-08-01 | 2017-04-05 | 安徽霍山县东方大地生态农林有限公司 | A kind of vibration feeding device of screening machine |
-
2017
- 2017-04-19 CN CN201710255809.2A patent/CN106984383A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1080645A (en) * | 1996-09-06 | 1998-03-31 | Synx Kk | Device for crushing waste building material |
| JP2001137726A (en) * | 1999-11-16 | 2001-05-22 | Minoru Hosoda | Gypsum board grinding and fractionating treatment apparatus |
| CN201625547U (en) * | 2009-12-23 | 2010-11-10 | 江门市科恒实业股份有限公司 | Novel roller-type breaker |
| CN202290149U (en) * | 2011-10-27 | 2012-07-04 | 江油晟达机电装备有限责任公司 | Novel no-blockage two-level tooth-roller crusher |
| US8511591B1 (en) * | 2012-01-31 | 2013-08-20 | SDF Recycling, LLC. | System and method for separating and recycling multi-layered construction panels |
| CN104707702A (en) * | 2013-12-12 | 2015-06-17 | 北新集团建材股份有限公司 | Recovery and treatment method and device of gypsum plaster board |
| CN205182832U (en) * | 2015-11-29 | 2016-04-27 | 王天宝 | Ability automatic feed's high -efficient ore crusher |
| CN205628100U (en) * | 2016-04-26 | 2016-10-12 | 江苏省冶金设计院有限公司 | Four -roller crusher |
| CN206064803U (en) * | 2016-08-01 | 2017-04-05 | 安徽霍山县东方大地生态农林有限公司 | A kind of vibration feeding device of screening machine |
Non-Patent Citations (1)
| Title |
|---|
| 马恩普等: "《烧结砖瓦工业机械设备 上》", 30 June 1989, 武汉工业大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108993858A (en) * | 2018-06-22 | 2018-12-14 | 宁波北新建材有限公司 | A kind of separation system of Novel gypsum board mask paper and gypsum |
| CN110788117A (en) * | 2019-10-31 | 2020-02-14 | 太仓北新建材有限公司 | Automatic paper device about separation waste board |
| CN111644230A (en) * | 2020-05-07 | 2020-09-11 | 江苏营特泰克智能环保设备有限公司 | A paper powder separating centrifuge for $ fitting up useless gypsum board in rubbish and handle |
| CN112264428A (en) * | 2020-09-29 | 2021-01-26 | 田洪梅 | Recovery unit of thistle board with locating component |
| CN113231433A (en) * | 2021-04-01 | 2021-08-10 | 郑州工业应用技术学院 | Dust device for civil engineering |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170728 |
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| RJ01 | Rejection of invention patent application after publication |