CN110124882B - Method for adjusting gap between screen basket and scraper of mining centrifuge - Google Patents
Method for adjusting gap between screen basket and scraper of mining centrifuge Download PDFInfo
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- CN110124882B CN110124882B CN201910550045.9A CN201910550045A CN110124882B CN 110124882 B CN110124882 B CN 110124882B CN 201910550045 A CN201910550045 A CN 201910550045A CN 110124882 B CN110124882 B CN 110124882B
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- screen basket
- scraper
- centrifuge
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- gaskets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
- B04B2011/088—Skimmers or scrapers for discharging ; Regulating thereof with angularly and axially offset scrapers
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Abstract
The invention discloses a method for adjusting the gap between a screen basket and a scraper of a mining centrifuge, which comprises the following steps: raising a scraper of the centrifuge by using a scraper gasket to enable the scraper to be positioned at the top of the screen basket; a plurality of screen basket gaskets are additionally arranged on a screen basket base, so that the clearance between a scraper and a screen basket is ensured to be within 1-3 mm; when the scraper is worn, the height of the screen basket is reduced by reducing the number of screen basket gaskets on the base of the screen basket; by running, the clearance between the scraper and the screen basket is ensured to be within 1-3mm, and the moisture content in the commercial coal reaches the standard; the invention can reduce the water content in commercial coal from 16-17% to 5-10%, and the original clearance adjusting time is reduced from 36 hours to 1.5 hours.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of coal preparation industry, and particularly relates to a method for adjusting a gap between a screen basket and a scraper of a mining centrifuge.
[ background of the invention ]
The vertical spiral discharging centrifuge is dewatering equipment for separating solid from liquid by means of centrifugal force produced by mechanical rotation. The motor drives the differential mechanism to run through a triangle belt, and two pairs of helical cylindrical gears with the difference of the number of teeth being 1 are arranged on the differential mechanism and are respectively meshed with the gears arranged on the outer shaft and the mandrel, so that the screen basket and the spiral discharging scraper can keep rotating in the same direction and have proper rotating speed difference. The coal slime enters a space between the screen basket and the spiral discharging scraper through the material distributing cone through the material inlet. Under the action of centrifugal force, water and small coal slime particles penetrate through the material layer, pass through the screen, flow into a water collecting tank at the upper part of the machine base along the upper cover, and then are discharged out of the machine base through liquid discharge pipes arranged at two sides of the machine base; the coal grain keeps inboard at the basket, has certain rotational speed difference between spiral scraper and the basket of unloading, makes the spiral scraper of unloading scrape the coal grain from the screen cloth to with its propelling movement to basket of sieving bottom, thereby unload the coal slime after the dehydration in the material receiving funnel of machine below, this dehydration process goes on in succession.
In actual production, centrifuge uses for a long time, the coal slime can produce great wearing and tearing to the spiral scraper of unloading in the centrifuge, along with helical blade's wearing and tearing, clearance between blade edge and the sifter becomes gradually, can not satisfy 1.5 +/-0.5 mm's normal use clearance, the coal slime adhesion is on the basket, can not in time be scraped, lead to the dehydration effect decline of centrifuge basket, product moisture is great partially, the degree of wear of centrifuge basket has been aggravated simultaneously, the life of centrifuge basket has been shortened. In addition, the processing capacity of the centrifuge is also greatly different due to the difference of the coal quality and the feed particle size composition. Generally speaking, with the increase of fine particle content in the human material, if the working clearance between sieve basket and the spiral scraper of unloading can not in time be adjusted, then can influence centrifuge's dehydration effect, lead to centrifuge throughput to reduce, product moisture increases.
The scraper of the vertical centrifuge is continuously worn in the using process, so that the gap between the screen basket and the scraper is too large, the dewatering effect of clean coal is influenced, the moisture of the dewatered clean coal is about 16-17%, the moisture of commercial coal is required to be below 10%, the replacement of the scraper wastes labor and time, and the service life of the scraper is short.
[ summary of the invention ]
The invention aims to provide a method for adjusting the gap between a screen basket and a scraper of a mining centrifuge, which aims to solve the problem that the moisture of the existing product is increased due to the difficulty in screening and scraper gap adjustment.
The invention adopts the following technical scheme: a method for adjusting the gap between a screen basket and a scraper of a mining centrifuge comprises the following steps:
raising a scraper of the centrifuge by using a scraper gasket to enable the scraper to be positioned at the top of the screen basket;
a plurality of screen basket gaskets are additionally arranged on a screen basket base, so that the clearance between a scraper and a screen basket is ensured to be within 1-3 mm;
when the scraper is worn, the height of the screen basket is reduced by reducing the number of screen basket gaskets on the base of the screen basket;
through operation, the clearance between the scraper and the screen basket is ensured to be within 1-3mm, and the moisture content in the commercial coal reaches the standard.
Further, the scraper and screen basket gap is 2 mm.
Further, the adjusting method is suitable for the mining vertical dewatering centrifuge.
Further, the moisture content in the commercial coal produced by the adjusting method reaches 5-10%.
Furthermore, the total thickness of the screen basket gaskets is 12mm, the screen basket gaskets are made of iron plates, and the iron plates are 1 iron plate with 6mm and 2 iron plates with 3 mm.
Further, the total thickness of the screen basket gaskets is 12mm, the screen basket gaskets are made of iron plates, and the iron plates are 1 iron plate with 6mm, 1 iron plate with 3mm, 1 iron plate with 2mm and 1 iron plate with 1 mm.
The invention has the beneficial effects that: the moisture content in the commercial coal is reduced from 16-17% to 5-10%, and the original clearance adjusting time is reduced from 36 hours to 1.5 hours.
[ description of the drawings ]
FIG. 1 is a schematic view of the structure of the present invention.
Wherein: 1. a scraper shim; 2. a screen basket; 3. a scraper; 4. a bell jar; 5. a gap; 6. a screen basket gasket.
[ detailed description ] embodiments
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a method for adjusting the gap between a screen basket and a scraper of a mining centrifuge,
step 1: a scraper gasket 1 is used for heightening a scraper 3 of the centrifuge to enable the scraper to be positioned at the top of a screen basket 2;
step 2: a plurality of screen basket gaskets 6 are additionally arranged on the base of the screen basket 2 to ensure that the gap 5 between the scraper 3 and the screen basket 2 is within 1-3 mm;
and step 3: when the scraper 3 is worn, the height of the screen basket 2 is reduced by reducing the number of screen basket gaskets 6 on the base of the screen basket 2;
and 4, step 4: by operation, the gap 5 between the scraper 3 and the screen basket 2 is ensured to be within 1-3 mm.
Wherein the gap 5 between the scraper 3 and the screen basket 2 in steps 2 and 4 is optimally 2 mm.
As shown in fig. 1, the bell jar 4 is installed on the rotating main machine, the scraper 3 is installed on the upper portion of the bell jar 4, the screen basket 2 is located on the periphery of the scraper 3, namely the scraper 3 is located between the screen basket 2 and the bell jar 4, the lower outer edge of the bell jar 4 is in threaded connection with the screen basket 2, the moisture content in the produced commercial coal is determined by the gap 5 between the scraper 3 and the screen basket 2, and the larger the gap 5 is, the larger the moisture is, the smaller the gap 5 is, and the smaller the moisture is.
The adjusting method is suitable for the mining vertical dewatering centrifuge; the moisture content in the commercial coal produced by the adjusting method can reach 5-10%;
the scraper gasket 1 is used for raising a scraper 3 of the centrifuge to be positioned at the top of a screen basket 2, namely, the scraper gasket is raised by 12mm, a plurality of screen basket gaskets 6 are additionally arranged at the base of the screen basket 2, the total thickness of the screen basket gaskets 6 is 12mm, the screen basket gaskets 6 are made of iron plates, the iron plates are 1 iron plate with 6mm and 2 iron plates with 3mm, the gaps 5 between the scraper 3 and the screen basket 2 are ensured to be 2mm, the design of the gaskets is not random, because the optimal gaps 5 between the scraper 3 and the screen basket 2 are 2mm, the optimal adjustment is realized by arranging the gaskets with 3 times of thickness, if 3 screen basket gaskets 6 with 3mm are adopted, although the effect can be achieved, the gaps 5 between the gaskets can influence the height of the screen basket 2, further, the distance between the screen basket 2 and the scraper 3 is deviated, and therefore, the screen basket gaskets 6 with 2mm of thickness and the screen basket gaskets 6 with 1mm of thickness are selected to be optimal, no matter how the height of the screen basket 2 is adjusted, the gap 5 between the screen basket 2 and the scraper 3 can be adjusted to be a multiple of 3mm by using the minimum number of screen basket gaskets 6, the number of the gaskets is adjusted according to the abrasion condition of the scraper 3 and the change condition of commodity moisture in the using process, so that the height of the screen basket 2 is reduced, the optimal gap 5 between the screen basket 2 and the scraper 3 is ensured, destructive disassembly must be used due to the difficulty in disassembling the scraper 3, and the invention breaks through the traditional concept that the gap 5 between the screen basket 2 and the scraper 3 is replaced after the moisture exceeds the standard due to the overlarge gap 5 between the screen basket 2 and the scraper 3, and ensures that the moisture of the commodity coal reaches the standard by adjusting the height of the screen basket 2.
It is a plurality of the gross thickness of basket gasket 6 is 12mm, and is a plurality of basket gasket 6 makes for iron plate, and a plurality of iron plates are 1 iron plate of 6mm, 1 iron plate of 3mm, 1 iron plate of 2mm and 1 iron plate of 1 mm. Scraper 3 and basket 2 clearance 5 guarantee at 2mm, and the design of gasket here is not random design, because scraper 3 and basket 2 best clearance 5 are 2mm, consequently adjust also can reach the best through setting up 4 iron plates to can adjust at will, convenient and practical, clearance 5 between scraper 3 and the basket 2 is not the linear relation with the thickness of gasket moreover, so the gasket of different thickness is better to be adjusted. The height of the screen basket 2 is reduced by adjusting the quantity of the gaskets according to the abrasion condition of the scraper 3 and the change condition of the commodity moisture in the using process, the optimal gap 5 between the screen basket 2 and the scraper 3 is ensured, destructive disassembly must be used due to the difficulty in disassembling the scraper 3, the invention breaks through the traditional concept that the gap 5 between the screen basket 2 and the scraper 3 is too large, the gap 5 between the screen basket 2 and the scraper 3 is adjusted by adjusting the height of the screen basket 2 after the moisture exceeds the standard, and the moisture of the commodity coal is ensured to reach the standard.
In the prior art, the adjustment of the gap 5 between the screen basket 2 and the spiral discharging scraper 3 of the centrifuge needs to be performed by detaching the screen basket 2 and the spiral discharging scraper 3 of the centrifuge, placing a group of adjusting gaskets below the spiral discharging scraper 3, wherein the thickness of each gasket is 1mm, so that the gap 5 between the spiral blade and the screen surface can be reduced by 0.34mm, placing an appropriate adjusting gasket below the spiral discharging scraper 3, so that the spiral discharging scraper 3 is lifted to an appropriate height, keeping the normal use gap 5 of 1.5 +/-0.5 mm, and after the adjustment is completed, sequentially loading the detached parts, so as to complete the adjustment of the gap 5 between the screen basket 2 and the spiral discharging scraper 3. And then measuring the gap 5 between the screen basket 2 and the spiral discharging scraper 3, and if the intermittent adjustment is not suitable, the working procedures need to be carried out again, so that the operation is very complicated. When adjusting the clearance 5 between the screen basket 2 and the spiral discharging scraper 3 of the centrifuge, about 6 persons are needed, and the adjustment work of the clearance 5 of the screen basket 2 can be completed within 6 hours. The adjusting mode has the disadvantages of high labor intensity, complex operation process, easy occurrence of rework condition, time and labor waste, high danger coefficient and difficult field construction management.
After the adjusting method provided by the invention is adopted, the adjustment work of the gap 5 of the screen basket 2 can be completed by only 2 persons within 1.5-2h, most importantly, the scraper 3 does not need to be frequently replaced, the centrifuge, the material distribution cone, the outlet protection ring and the spiral discharging scraper 3 do not need to be disassembled in the adjusting process, the water content in the produced commercial coal is reduced to 5-10% from the original 16-17%, the operation is simple, the labor intensity is low, the reworking condition is not easy to occur, and the risk coefficient is low.
The working process of the staff in the invention is as follows:
performing spot check on the moisture of the coarse clean coal once every three shifts in the first week, and performing spot check on the moisture for 2-3 times every week later if the moisture of the spot check is stabilized below 6% -10%; after one month, the water content is still stable, and then the water content is spot checked at irregular intervals; and if the water content is higher than 6% -10% by spot check, the gap 5 between the scraper 3 and the screen basket 2 is adjusted again until the water content is stabilized below 12%.
Example 1
The saved cost of the adjusting method is calculated by taking the existing LLL1200X650B type coal slime centrifugal dehydrator of the coal plant of the company as an example, and the details are as follows:
material cost:
after the adjusting method is used, the service life of each centrifuge scraper 3 can be prolonged by 3 times, and each scraper is 317948 yuan, 17948 yuan × 2 yuan 35896 yuan. 4 centrifuges of the coal preparation plant need to be replaced 2 times per year, and the material cost can be saved by 35896 multiplied by 2 multiplied by 4 which is 287168 yuan per year.
Labor cost:
the scraper 3 is replaced from 4 people for 10 hours to 2 people for 2 hours. The labor can be saved by 36 hours each time, and the four centrifuges are replaced 2 times per year according to the 120 yuan per eight hours, so that the labor can be saved by 120 multiplied by 4 multiplied by 2 multiplied by 1920 yuan per year.
And (4) deducting fee when moisture exceeds standard:
the moisture of the coarse clean coal before the transformation of the centrifuge is 12-14%, the moisture of the coarse clean coal after the transformation is 6-10%, the total clean coal product moisture is reduced from about 17% to about 12% at present, the moisture of the product coal can be reduced by about 5%, the train is transported outside by more than 5 ten thousand tons in 2017, and the transportation cost per ton is 100 yuan. After transformation in 2017 and 5 months, the freight cost can be saved by 11 months in 2017 by 50000 tons multiplied by 0.05 multiplied by 100 multiplied by 6 months which is 1500000 yuan. And after the transformation, the cost deduction of customers due to excessive moisture is reduced, and the quality of clean coal products is improved.
In 2018, the total cost of materials, labor and water are saved, and the fee of deduction beyond the standard is 1789088 yuan.
Claims (5)
1. A method for adjusting the gap between a screen basket and a scraper of a mining centrifuge is characterized by comprising the following steps:
a scraper (3) of the centrifuge is lifted by using a scraper gasket (1) to be positioned at the top of the screen basket (2);
a plurality of screen basket gaskets (6) are additionally arranged on the base of the screen basket (2) to ensure that the gap (5) between the scraper (3) and the screen basket (2) is within 1-3 mm;
when the scraper (3) is worn, the height of the screen basket (2) is reduced by reducing the number of screen basket gaskets (6) on the base of the screen basket (2);
through operation, the gap (5) between the scraper (3) and the screen basket (2) is ensured to be within 1-3mm, the moisture content in the commercial coal reaches the standard, and the moisture content in the commercial coal produced by the adjusting method reaches 5-10%.
2. Method for adjusting the screen basket to scraper gap of mining centrifuges according to claim 1, characterized in that the scraper (3) and screen basket (2) gap (5) is at 2 mm.
3. The method for adjusting the gap between the screen basket and the scraper of the mining centrifuge according to claim 1, wherein the adjusting method is suitable for a mining vertical dewatering centrifuge.
4. The method for adjusting the gap between the screen basket and the scraper of the mining centrifuge as claimed in any one of claims 1 to 3, wherein the total thickness of the screen basket gaskets (6) is 12mm, the screen basket gaskets (6) are made of iron plates, and the iron plates are 1 iron plate with 6mm and 2 iron plates with 3 mm.
5. The method for adjusting the gap between the screen basket and the scraper of the mining centrifuge according to any one of claims 1 to 3, wherein the total thickness of the screen basket gaskets (6) is 12mm, the screen basket gaskets (6) are made of iron plates, and the iron plates are 1 iron plate with 6mm, 1 iron plate with 3mm, 1 iron plate with 2mm and 1 iron plate with 1 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910550045.9A CN110124882B (en) | 2019-06-24 | 2019-06-24 | Method for adjusting gap between screen basket and scraper of mining centrifuge |
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| CN201910550045.9A CN110124882B (en) | 2019-06-24 | 2019-06-24 | Method for adjusting gap between screen basket and scraper of mining centrifuge |
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| CN110124882A CN110124882A (en) | 2019-08-16 |
| CN110124882B true CN110124882B (en) | 2020-12-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4938664B1 (en) * | 1967-12-02 | 1974-10-19 | ||
| CN2203903Y (en) * | 1994-10-25 | 1995-07-26 | 徐其国 | Filtering creen type centrifuge |
| CN203355432U (en) * | 2013-06-05 | 2013-12-25 | 安徽理工大学 | Height-adjustable spiral conveying device |
| CN203448195U (en) * | 2013-08-12 | 2014-02-26 | 江苏捷达离心机制造有限公司 | Material distributing device for centrifugal machine |
| CN208340970U (en) * | 2018-04-26 | 2019-01-08 | 烟台重阳机械有限公司 | A kind of barrel tumbler structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6736968B2 (en) * | 2002-06-25 | 2004-05-18 | Tema Systems, Inc. | Horizontal scroll screen centrifuge |
| WO2016112426A1 (en) * | 2015-01-15 | 2016-07-21 | Weir Minerals Australia Ltd | Centrifugal screening apparatus |
-
2019
- 2019-06-24 CN CN201910550045.9A patent/CN110124882B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4938664B1 (en) * | 1967-12-02 | 1974-10-19 | ||
| CN2203903Y (en) * | 1994-10-25 | 1995-07-26 | 徐其国 | Filtering creen type centrifuge |
| CN203355432U (en) * | 2013-06-05 | 2013-12-25 | 安徽理工大学 | Height-adjustable spiral conveying device |
| CN203448195U (en) * | 2013-08-12 | 2014-02-26 | 江苏捷达离心机制造有限公司 | Material distributing device for centrifugal machine |
| CN208340970U (en) * | 2018-04-26 | 2019-01-08 | 烟台重阳机械有限公司 | A kind of barrel tumbler structure |
Non-Patent Citations (1)
| Title |
|---|
| 立式离心机筛篮间隙调节器的研制与应用;秦宇臻;《选煤技术》;20180225(第1期);第69-71页 * |
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