CN110124800B - Method for producing limestone machine-made sand by dry method - Google Patents
Method for producing limestone machine-made sand by dry method Download PDFInfo
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- CN110124800B CN110124800B CN201910576823.1A CN201910576823A CN110124800B CN 110124800 B CN110124800 B CN 110124800B CN 201910576823 A CN201910576823 A CN 201910576823A CN 110124800 B CN110124800 B CN 110124800B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/13—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and combined with sifting devices, e.g. for making powdered fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
- B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/282—Shape or inner surface of mill-housings
- B02C13/284—Built-in screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/286—Feeding or discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the 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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/286—Feeding or discharge
- B02C2013/28618—Feeding means
- B02C2013/28654—Feeding means of screw type
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a method for producing limestone machine-made sand by a dry method, which sequentially comprises the following processes: stacking broken stones, feeding on a terrace, feeding, crushing, sieving and mixing with water to obtain a finished product; and carrying out high-temperature drying treatment during feeding. The feeding equipment is provided with an electric heating component. The feeding equipment is a screw feeder and comprises a feeding shell, a screw rod is rotated in the feeding shell under the driving of a motor, one end of the feeding shell is provided with a feeding hole, the other end of the feeding shell is provided with a discharging hole, and an electric heating wire is embedded in the inner wall of the feeding shell.
Description
Technical Field
The invention relates to the technical field of dry-method sand making, in particular to a method for producing limestone machine-made sand by a dry method.
Background
With the further development of economic construction in China, the yield of concrete is increased more and more, and the demand of natural sand as a concrete raw material is increased sharply. In some areas, because of the scarcity of natural sand, machine-made sand is more and more widely applied to various concrete projects. The machine-made sand is sand which is suitable for buildings and has the grain diameter less than or equal to 5mm and is obtained by crushing mountain stones. Compared with natural sand, the particle characteristics of the machine-made sand are rough surface, more edges and corners and coarser particles.
In the prior art, the machine-made sand production mainly has the following defects: (1) the sand produced by the mainstream sand making machine has serious problems in particle shape, size and shape, and has several fatal problems of coarse granularity, more needle sheets, more powder and poor gradation. (2) Some manufacturers can relatively stabilize the particle grading, the fineness modulus of machine-made sand is 2.4-3.2, but most of the manufacturers show the condition that two ends are more and the middle is less, namely large particles and fine particles are more and middle particles are lack. (3) In the dry sand making process, in order to avoid dust emission when finished products are transported, a certain amount of water needs to be injected into the finished sand, but the injected water amount needs to be accurately controlled, the water content is too low, and the machine-made sand can emit dust when being transported out; the water content is too high, the formed finished sand can be lumpy and even become mortar, and the water content of the machine-made sand also can have great influence on the quality of concrete. Under an ideal condition, the water content of the material source of the machine-made sand production line is usually controlled to be 2% -5%, and the water content of the finished product sand can be controlled only by manually adjusting the water injection amount to the finished product sand in unit time according to the preset value of the water content of the machine-made sand. In fact, the moisture content of the raw materials is often uncontrollable during production due to the influence of the storage, the preservation of the batch, the storage and the preservation, the weather, and the like of the raw materials. In addition, in the dry-method sand making process, the weight of finished sand produced every hour is constantly changed, and more complex influence is generated on the control of the water content of the machine-made sand.
Document building material discloses a dry-method sand making process machine-made sand water content control technology research and discloses a method for controlling the water content of machine-made sand on line, which mainly realizes the monitoring of the water content through a sensor and a control software system, but the commonly used sensor has relatively high requirements on the environment and relatively high cost.
Disclosure of Invention
The invention aims to provide a method for producing limestone machine-made sand by a dry method, which solves the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for producing limestone machine-made sand by a dry method sequentially comprises the following processes: stacking broken stones, feeding on a terrace, feeding, crushing, sieving and mixing with water to obtain a finished product;
high-temperature drying treatment is carried out during feeding; and (5) drying in the greenhouse before feeding.
As a preferred technical scheme, the feeding equipment is provided with an electric heating assembly.
As a preferred technical scheme, the feeding equipment is a screw feeder and comprises a feeding shell and a screw rod which rotates in the feeding shell under the driving of a motor, one end of the feeding shell is provided with a feeding hole, the other end of the feeding shell is provided with a discharging hole, and an electric heating wire is embedded in the inner wall of the feeding shell.
As a preferred technical scheme, the outer wall of the feeding equipment is provided with a heat insulation layer.
As a preferred technical scheme, an electric heating wire which is spirally arranged by taking the axis of the feeding machine shell as the axis is embedded in the inner wall of the feeding machine shell.
As a preferred technical scheme, the crushing equipment comprises a machine shell, wherein a feeding hole is formed in the top of the machine shell, a crushing cavity is formed in the machine shell, an opening is formed in the lower portion of the machine shell, and a discharging grate is arranged at the opening;
the broken intracavity is equipped with the broken subassembly of pivoted weight under motor drive assembly drives, and the broken subassembly of weight includes power shaft, mounting disc, tup, and a plurality of mounting discs are fixed on the power shaft, and power shaft one end is stretched out the casing and is connected with motor drive assembly, and the rotatable setting of power shaft other end is in the casing, a plurality of tups of outer dish face installation of mounting disc.
As a preferred technical scheme, the mounting disc is a spiral disc, a multi-stage screen assembly is arranged in the crushing cavity and comprises a plurality of screens, and the number n of the screens = the number m-1 of the spiral disc;
the plurality of screens are respectively arranged between the adjacent spiral disks, the crushing cavity is divided into a plurality of crushing areas, the apertures of the plurality of screens are gradually reduced from the direction of the last-stage crushing area of the first-stage crushing area, and the apertures of the plurality of screens are all larger than the apertures of the discharging grate.
As a preferred technical scheme, in the direction from the first-stage crushing area to the last-stage crushing area, the hammer head density of each crushing area is gradually increased, and the hammer head size is gradually reduced.
As a preferred technical scheme, the screen is arranged on the power shaft through a bearing.
Compared with the prior art, the invention has the following beneficial effects:
(1) the drying operation is carried out simultaneously in the feeding process to ensure that the dryness of the crushed and sieved crushed stone raw materials is basically uniform, so that the water adding amount in the wet mixing process is uniform for dust prevention.
(2) The structure of the crushing equipment is improved, so that the crushing and sieving work is realized in the crushing equipment, and the one-step forming of a single machine is realized through the structural improvement, the process of repeated crushing in the prior art is reduced, and the flow and the equipment are simplified. And the particle shape and the shape are more uniform through multiple sieving, and the gradation is more stable.
Drawings
Fig. 1 is a cross-sectional view of a crushing plant.
Fig. 2 is a schematic diagram of the effect of the spiral disk.
Wherein the reference numbers are as follows: 1-upper casing, 2-lower casing, 3-lining plate, 4-discharging grate, 5-spiral plate, 6-hammer head and 7-screen.
Detailed Description
The present invention is directed to overcoming the disadvantages of the prior art and providing a method for dry-process limestone machine-made sand, and the present invention will be described in further detail with reference to the following examples.
Example 1
Example 1
A method for producing limestone machine-made sand by a dry method comprises the following processes in sequence as in the prior art: and (4) gravel stacking, terrace feeding, crushing and sieving, and mixing with moisture to obtain a finished product.
In order to solve the problems in the prior art, the following design is provided based on the above conventional process: firstly, improve material feeding unit's structure for the in-process at the pay-off is dried the operation simultaneously, is basically unified with the degree of dryness of the rubble raw materials of guaranteeing to get into broken sieve, thereby is convenient for mix the unity of the water yield of wet in-process. And secondly, the structure of the crushing equipment is improved, so that the crushing and sieving work is realized in the crushing equipment, one-step forming of a single machine is realized through the structural improvement, the process of repeated crushing in the prior art is reduced, and the process and the equipment are simplified.
In this embodiment, the feeding may be horizontal feeding, lifting feeding, and downward feeding according to the position relationship between the crushing device and the feeding device, and generally, the feeding device for crushed stones is generally a screw feeder regardless of the position relationship.
Like the prior art, the screw feeder comprises a feeding shell, and a screw rod is rotated in the feeding shell under the driving of a motor, wherein one end of the feeding shell is provided with a feeding hole, and the other end of the feeding shell is provided with a discharging hole. The difference between this embodiment and prior art lies in, is closed at the pay-off casing, only two openings that communicate with the external world of feed inlet and discharge gate, and pay-off casing outer wall is equipped with thermal-insulated heat preservation, and pay-off casing inner wall embedding has the electric heating wire who uses pay-off casing axis as axis spiral setting. The heat insulation layer prevents the rapid heat exchange between hot air and the outside and prevents workers from being scalded carelessly. Among the prior art, the rubble piles up the process and is exactly a drying process in fact, but in fact, because the rubble piles up from top to bottom, unable even drying and different rubble raw materials water content are different promptly, and consequently the rubble moisture content is uncontrollable when getting into process flow.
And at the pay-off in-process, because screw feeder structural feature, therefore the rubble raw materials can not pile up a lot, consequently, adopt the electric heat to carry out quick high temperature drying simultaneously in the pay-off, when guaranteeing that the rubble raw materials gets into crushing apparatus, it does not have the water content basically, then only add moisture mixing wet in-process, guarantee the water content of finished product sand, and because adding water and mixing wet at this moment raw materials own no water content, this process of so mixing wet is with regard to very good control, to finished product sand, the moisture content is stable and the moisture content is comparatively accurate.
In this embodiment, the crushing apparatus includes a casing, a feeding port is disposed at the top of the casing, a crushing cavity is disposed inside the casing, the casing can be divided into an upper casing 1 and a lower casing 2 as in the prior art, a lining plate 3 is disposed on the inner wall of the upper casing 1, and the arrangement position of the lining plate is the same as that in the prior art and will not be described in detail. Like the prior art, the lower part of the lower casing 2 is provided with an opening, and the opening is provided with a discharge grate 4, of course, the discharge grate 4 is detachably connected with the lower casing 2 through bolts.
The crushing intracavity is equipped with the broken subassembly of pivoted weight under motor drive assembly drives, and the broken subassembly of weight includes power shaft, spiral disk 5, tup 6, and a plurality of spiral disks 5 are fixed on the power shaft, and the casing is stretched out to power shaft one end and is connected with motor drive assembly, and the rotatable setting of power shaft other end is in the casing. The outer disc surface of the spiral disc 5 is provided with a plurality of mounting holes for mounting the hammer head 6.
In this embodiment, be equipped with multistage screen assembly in the crushing chamber, multistage screen assembly includes a plurality of screen cloth 7, and to be accurate say, the quantity n of screen cloth = the quantity m-1 of spiral dish.
The screen cloth 7 sets up respectively between adjacent spiral plate 5, cuts apart into multistage crushing district with the crushing chamber, and specifically speaking, the casing feed inlet is located the top in first stage crushing district, and all materials pass through first stage crushing district earlier, then loop through multistage screen cloth 7 and go until the final stage grinding.
In particular, the screen 7 is mounted on a power shaft via bearings, the power shaft rotating while the screen 7 does not rotate.
Furthermore, the apertures of the plurality of screens 7 are gradually reduced from the direction of the last-stage crushing area of the first-stage crushing area, and the apertures are all larger than the apertures of the discharging grate. Furthermore, from the direction of the first-stage crushing area to the last-stage crushing area, the density of the hammer heads 6 of each crushing area is gradually increased, and the size of the hammer heads 6 is gradually reduced. (since the size of each stage of crushing area is equivalent, the density is increased, and the hammer head 6 is necessarily required to be smaller, and it is worth explaining that the length of the hammer head 6 is constant.)
The discharging grate 4 spans all the crushing areas, namely when in crushing work, raw materials firstly enter the primary crushing area and are in the primary crushing area, if the crushing reaches the target granularity, the raw materials are directly discharged through the grate below, if the crushing does not reach the target granularity, the raw materials can pass through the adjacent screen 7 between the discharging grate and the next stage, the raw materials enter the next stage crushing area through the screen 7 under the auxiliary action of the spiral disc 5, and then the process is repeated and the raw materials are fed to the next stage.
The process parameters of the method for producing limestone machine-made sand by a dry method in the embodiment are as follows:
the crushing and screening process is preferably performed by a four-stage screen 7. The aperture of the first-stage screen 7 is 1cm, the aperture of the second-stage screen 7 is 20mm, the aperture of the third-stage screen 7 is 10mm, the aperture of the fourth-stage screen 7 is 1mm, and the aperture of the discharging grate 4 is 0.35 mm.
The crushing areas are five, and the hammer heads 6 of each crushing area from the first to the last are respectively 4, 8, 12, 16 and 20.
The invention is well implemented in accordance with the above-described embodiments. It should be noted that, based on the above structural design, in order to solve the same technical problems, even if some insubstantial modifications or colorings are made on the present invention, the adopted technical solution is still the same as the present invention, and therefore, the technical solution should be within the protection scope of the present invention.
Claims (6)
1. A method for producing limestone machine-made sand by a dry method is characterized by sequentially comprising the following processes of: stacking broken stones, feeding on a terrace, feeding, crushing, sieving and mixing with water to obtain a finished product;
high-temperature drying treatment is carried out during feeding; before feeding, drying in the greenhouse;
the equipment for crushing comprises a shell, wherein a feeding hole is formed in the top of the shell, a crushing cavity is formed in the shell, an opening is formed in the lower part of the shell, and a discharging grate is arranged at the opening;
a heavy hammer crushing assembly which rotates under the driving of a motor driving assembly is arranged in the crushing cavity and comprises a power shaft, mounting discs and hammers, wherein the mounting discs are fixed on the power shaft;
the mounting disc is a spiral disc, a multi-stage screen assembly is arranged in the crushing cavity and comprises a plurality of screens, and the number n of the screens is equal to the number m-1 of the spiral disc;
the plurality of screens are respectively arranged between the adjacent spiral discs to divide the crushing cavity into a multi-stage crushing area, and the apertures of the plurality of screens are gradually reduced from the direction of the last-stage crushing area of the first-stage crushing area and are all larger than the aperture of the discharging grate;
in the direction from the first-stage crushing area to the last-stage crushing area, the hammer head density of each crushing area is gradually increased, and the hammer head size is gradually reduced;
the lower part of the machine shell is provided with an opening, and the opening is provided with a discharging grate,
the discharging grate spans all the crushing areas, when in crushing work, raw materials firstly enter the primary crushing area and are in the primary crushing area, if the crushing reaches the target granularity, the raw materials are directly discharged through the grate below, if the raw materials do not reach the standard, the raw materials can pass through an adjacent screen between the discharging grate and the next level, and then the raw materials enter the next level crushing area through the screen under the auxiliary action of the spiral plate.
2. A method for dry production of limestone machine sand according to claim 1, wherein the feeding device is provided with an electric heating assembly.
3. The method for dry production of limestone machine-made sand according to claim 2, wherein the feeding device is a screw feeder, comprising a feeding housing, a screw rod rotating in the feeding housing under the driving of a motor, the feeding housing having a feeding port at one end and a discharging port at the other end, and an electric heating wire embedded in the inner wall of the feeding housing.
4. The method for producing the limestone machine-made sand by the dry method according to any one of claims 2 to 3, wherein the outer wall of the feeding equipment is provided with a heat insulation layer.
5. The method for producing the limestone machine-made sand by the dry method as claimed in claim 3, wherein the electric heating wire spirally arranged by taking the axis of the feeding machine shell as the axis is embedded in the inner wall of the feeding machine shell.
6. A method for dry production of limestone machine-made sand according to claim 1, wherein the screen is mounted on the power shaft by means of bearings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910576823.1A CN110124800B (en) | 2019-06-28 | 2019-06-28 | Method for producing limestone machine-made sand by dry method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910576823.1A CN110124800B (en) | 2019-06-28 | 2019-06-28 | Method for producing limestone machine-made sand by dry method |
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| CN110124800A CN110124800A (en) | 2019-08-16 |
| CN110124800B true CN110124800B (en) | 2021-03-30 |
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| CN101712001A (en) * | 2008-10-08 | 2010-05-26 | 刘�文 | High-efficiency energy saving ore mill |
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| CN106140397A (en) * | 2015-04-27 | 2016-11-23 | 齐鲁工业大学 | The broken discharging adjusting means of weight counterattack |
| CN108722530A (en) * | 2018-03-30 | 2018-11-02 | 王忠宁 | A kind of intelligent grain of environmental protection, which squeezes, flat removes miscellaneous equipment |
| CN109336435A (en) * | 2018-09-04 | 2019-02-15 | 徐州金盟新型建材有限公司 | A kind of high performance concrete Machine-made Sand preparation method |
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| CN200945440Y (en) * | 2006-09-06 | 2007-09-12 | 江苏牧羊集团有限公司 | Grinder capable of adjusting gap between hammer and sieve |
| CN206631670U (en) * | 2017-02-28 | 2017-11-14 | 成都万基电力设备制造有限公司 | Paddle type mill dynamic circulation screening crusher |
| CN108993682A (en) * | 2018-07-25 | 2018-12-14 | 周佩龙 | A kind of finishing ore grinding device |
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|---|---|---|---|---|
| CN2402396Y (en) * | 1999-12-13 | 2000-10-25 | 孙晓航 | High-efficiency stone disintegrator for producing sand |
| CN201020383Y (en) * | 2007-04-03 | 2008-02-13 | 南充市高坪区鸿福机械加工厂 | Beater pulverizer |
| CN101712001A (en) * | 2008-10-08 | 2010-05-26 | 刘�文 | High-efficiency energy saving ore mill |
| CN202191929U (en) * | 2011-08-11 | 2012-04-18 | 赵康友 | Integral dry sand making machine |
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| CN106140397A (en) * | 2015-04-27 | 2016-11-23 | 齐鲁工业大学 | The broken discharging adjusting means of weight counterattack |
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| CN110124800A (en) | 2019-08-16 |
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Effective date of registration: 20220815 Address after: 299#, Fuxi Road, Xuyang Town, Rong County, Zigong City, Sichuan Province, 643100 Patentee after: Rong County Yeyuan Technology Co., Ltd. Address before: 643121 Dongxing Town Street, Rong County, Zigong City, Sichuan Province Patentee before: Zigong Beidou Cement Co.,Ltd. |
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