CN105215312B - A kind of double-roll thin-belt continuous casting roller cooling water flow control method - Google Patents
A kind of double-roll thin-belt continuous casting roller cooling water flow control method Download PDFInfo
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- 239000000498 cooling water Substances 0.000 title claims abstract description 233
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009749 continuous casting Methods 0.000 title abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 125
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 230000001276 controlling effect Effects 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract 1
- 101000927062 Haematobia irritans exigua Aquaporin Proteins 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
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Abstract
A kind of double-roll thin-belt continuous casting roller cooling water flow control method, every casting roll has more than one water inlet and corresponding water outlet, correspondingly, every casting roll has been internally formed more than one single cooling-water duct, and flow by the cooling water in this cooling-water duct can be adjusted by being provided with flow control valve in the water outlet of each cooling-water duct.Cooling water is provided to two casting rolls using the water pump of regulating flow quantity, meanwhile, cooling water flow value q in the flow controller monitoring each cooling-water duct of casting rolln, and according to this flow value qnWith cooling water flow average value in cooling-water ductDeviation, adjust corresponding flow control valve and change cooling water flow in corresponding cooling-water duct, finally realize that the flow in single casting roll in each cooling-water duct is consistent, so as to fulfill casting roll internal cooling even intensity.The method of the present invention has the advantages that cooling water flow control accuracy is high, fast response time.
Description
Technical Field
The invention relates to a thin strip continuous casting process technology, in particular to a method for controlling cooling water flow of a double-roller thin strip continuous casting roller.
Background
The typical production process of the twin-roll thin strip continuous casting technology comprises the following steps: molten steel is uniformly distributed in a space surrounded by two casting rolls which rotate oppositely and are cooled by water and baffles made of ceramic materials to form a molten pool, the molten steel is solidified on the roll surfaces, and thin strip steel is formed between the two casting rolls.
As shown in a typical process, a casting roll is generally provided with a water inlet and a water outlet for cooling water, the cooling water is introduced into the roll through the water inlet and enters a plurality of small cooling water holes which are generally arranged below the roll surface and uniformly distributed along the circumferential direction of the roll surface and penetrate through a roll body, the cooling water flows through the small cooling water holes and takes away heat released by solidification of molten steel on the roll surface, the temperature is also increased, and finally the cooling water is discharged to a water storage tank through the water outlet on the casting roll and is reused after being cooled.
Ideally, each cooling water channel of each casting roll has the same flow field characteristics, i.e., the same pressure, flow rate, temperature of cooling water flowing through a certain set of cooling water channels will increase the same temperature with the same pressure loss. In fact, the physical differences caused by some dimension deviation or machining defects in the machining process may cause the flow field characteristics of a certain group of cooling water channels to be different from those of other groups. Therefore, in order to ensure the cooling uniformity of the surface of the casting roll, parameters such as cooling water flow, pressure and temperature of each group of cooling water channels need to be accurately controlled, so that the water flow passing through each group of cooling water channels is equal, and the local cooling strength difference of the casting roll caused by processing defects is compensated.
Patent WO03055623a1 provides a method of calculating the temperature of the roll surface by a computer system in combination with other solidification parameters inherent thereto, by multiplying the measured difference between the temperature of the entering and leaving water of the casting roll by the amount of water to obtain the amount of heat released by the solidification of the molten steel, which is believed to be equal to the amount of heat carried away by the cooling water. This method is used to reverse the roll surface temperature, although it also uses the water temperature difference and the water amount to calculate the amount of heat removed by the cooling water.
Disclosure of Invention
The invention aims to provide a method for controlling the cooling water flow of a twin-roll thin strip continuous casting roller, which can directly control the cooling intensity of each casting roller and independently adjust the cooling intensity of each cooling water channel in the casting roller so as to ensure the cooling uniformity of two casting rollers, and has quick adjustment method and reliable means; moreover, the water supply system is simple and reliable, and can quickly reach the target flow. And the control system can quickly reach a steady state by finely adjusting the flow of each water outlet.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for controlling cooling water flow of twin roll strip casting rolls, each casting roll having one or more water inlets and one or more water outlets corresponding thereto, each casting roll having one or more individual cooling water passages formed therein; the water outlet of each cooling water channel is provided with a flow regulating valve which can independently regulate the flow of the cooling water in the cooling water channel, so that the flow in each cooling water channel in the casting roll is consistent. Wherein one or more water pumps capable of regulating flow are adopted to provide cooling water for two casting rolls through the same or a plurality of pipelines, and the total flow of the cooling water of a single casting roll is framed near a target flow Q by controlling the pressure of the water pumps. Further, the flow controller monitors the cooling water flow rate value q in each cooling water passage of each casting rollnAnd obtaining the cooling water flow value q in each cooling water channelnAverage value of cooling water flow in cooling water channelAccording to the deviation, the corresponding flow regulating valve is regulated to change the cooling water in the cooling water channelFlow rate, finally realizing the flow rate consistency in each cooling water channel in the casting roller; further, if the total flow rate of the cooling water of a single casting roll does not reach the target flow rate Q, the flow controller will make the total flow rate of the cooling water of each cooling water passage reach the target flow rate Q by changing the output pressure P of the water pump.
The target flow Q of the cooling water flow communicated with each casting roller is preset according to the process requirements, and the target flow values of the cooling water flow of the two casting rollers can be the same or different; wherein the target cooling water flow Q communicated to the interior of each casting roll is a flow range surrounding a theoretical cooling water flow Q calculated to be required according to the casting process requirements0The fluctuation, namely:
Q∈[Q0±ΔQ]1)
wherein: and delta Q is the fluctuation deviation amount allowed by the theoretical cooling water flow and is 2-3% of the theoretical cooling water flow.
The water outlet of each cooling water channel of the casting rolls is provided with a flow regulating valve which can regulate the flow of the cooling water in the cooling water channel and detect and transmit a cooling water flow value q in each cooling water channelnAnd is provided with a detection of the cooling water pressure pnThe device of (1) and an electric signal input/output device; one or more water pumps with adjustable pressure and flow rate simultaneously supply cooling water to the two casting rolls, and firstly, the flow controller controls the water pumps to reach the target pressure and stabilize; then, the flow controller can obtain the cooling water flow value q in each cooling water channel according to the electric signal feedback value at the outlet of a single casting rollernAnd calculating the average value of the cooling water flow in the cooling water passage of the casting rollNamely:
wherein n is the number of cooling water channels in the casting roll, and n is 1,2, 3.;
finally, the flow controller is based on qnAndthe difference between them sends out flow control valve aperture variation volume and gives the flow control valve of corresponding cooling water passageway, drives its action, finally makes the flow value equal in every cooling water passageway in single casting roll, promptly:
q1＝q2＝q3＝.......＝qnwherein n is 1,2,3. 3)
If the total cooling water flow of a single casting roll does not reach the target flow Q, the flow controller makes the total cooling water flow of the single casting roll reach the target flow by slightly changing the output pressure P of the water pump, wherein the target flow Q is the sum of the cooling water flows passing through the cooling water channels in the casting rolls, namely:
Q＝∑qnwherein n is 1,2,3. 4)
Further, the method for controlling the cooling water flow of the twin-roll thin strip continuous casting roll comprises the following steps:
1) the flow controller is used for controlling the flow rate q of cooling water in each cooling water channel of a single casting rollernAnd calculating the average value of the cooling water flow in the cooling water passage of the casting rollNamely:
2) the flow controller causes a cooling water flow value q in each cooling water passage in each casting rollnAnd the average valueEquality, i.e. flow controller according to qnAndthe difference value between the opening degree and the flow rate of the cooling water channel is sent to the flow rate regulating valve of the corresponding cooling water channel to drive the flow rate regulating valve to act, the flow rate deviation of the cooling water channel is compensated, finally the flow rate value in each cooling water channel in a single casting roller is equal, q is equal1＝q2＝q3＝.......＝qnWherein n is 1,2,3.. 3);
3) adjusting the output pressure P of the water pump so that the sum of the flow rates of the cooling water passing through the cooling water passages in each casting roll is equal to a target flow rate Q, which is the sum of the flow rates of the cooling water passing through the cooling water passages in the casting rolls, namely:
Q＝∑qnwherein n is 1,2,3.. 4);
4) and circularly performing the steps until the operation is finished.
In addition, any cooling water channel inside the casting roller comprises a water inlet, a water outlet and a plurality of small cooling water holes which are uniformly distributed below the roller surface along the circumferential direction of the roller surface and penetrate through the roller body, in the casting process, cooling water enters the roller from the water inlet and is uniformly distributed to the small cooling water holes communicated with the water inlet, and when the cooling water flows through the small cooling water holes, the heat released by the solidification of molten steel on the roller surface is taken away.
In addition, the small cooling water holes corresponding to any two cooling water channels are distributed at intervals in the circumferential direction of the casting roll and are not communicated with each other, and the cooling water in the adjacent small cooling water holes has opposite flow directions.
Compared with the patent WO03055623A1, the method for using the cooling water channel and the twin roll cooling water channel has the advantage that the quantity of heat taken away by the cooling water in each cooling water channel of the casting roll is taken as an indication for checking the difference of the cold strength between the cooling water channels or the twin roll, and the method for using the cooling water channel and the twin roll cooling water channel are different.
The invention has the advantages that:
1. the method can directly control the cooling intensity of each casting roller and independently adjust the cooling water flow of each cooling water channel in the casting roller, thereby ensuring the cooling uniformity of the two casting rollers, and the adjusting method is rapid and reliable.
2. The water supply system is simple and reliable, and can quickly reach the target flow. And the control system can quickly reach a steady state by finely adjusting the flow of each water outlet.
Drawings
FIG. 1 is a schematic illustration of a typical twin roll strip casting process;
FIG. 2 is a schematic illustration of cooling water passages within a casting roll of the present invention;
3 FIG. 33 3 is 3a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3A 3- 3A 3 of 3 FIG. 3 2 3 ( 3 illustrating 3 the 3 distribution 3 of 3 small 3 cooling 3 water 3 holes 3 in 3 the 3 casting 3 roll 3 of 3 the 3 present 3 invention 3) 3; 3
FIG. 4 is a schematic view of a casting roll cooling water supply system of the present invention;
FIG. 5 is a flow chart illustrating the flow control of cooling water to the casting rolls of the casting roll of the present invention.
Detailed Description
Twin roll strip casting process as shown in fig. 1, molten steel in a tundish 5 is uniformly distributed through a nozzle 6 and a distributor 7 to form a molten pool in a space enclosed by ceramic plates 2a, 2b on the roll surfaces of two casting rolls 1a, 1b through which cooling water is passed, and as the casting rolls rotate toward each other, the molten steel solidifies on the surfaces of the casting rolls and thus forms a thin cast strip 3 at the minimum gap between the two casting rolls.
The structure of the cooling water passage inside the roll will be described in detail below in conjunction with the casting roll 1 a.
As shown in fig. 2 and 3, the casting roll includes a roll core 18 and a roll shell 16, each of which is formed with holes for the entrance and exit of cooling water, thereby forming two separate cooling water passages 1 and 2 therein.
The cooling water channel 1 comprises a water inlet 14, a water outlet 15, a plurality of small cooling water holes 11 which are communicated with the water inlet 14 and the water outlet 15 and are uniformly arranged below the roller surface along the circumferential direction of the roller surface, and the small cooling water holes 11 penetrate through the roller body and are provided with sealing plugs 17 at the end parts.
The cooling water channel 2 comprises a water inlet 25, a water outlet 24, a plurality of small cooling water holes 21 which are communicated with the water inlet 25 and the water outlet 24 and are uniformly arranged below the roll surface by 10-35mm along the circumferential direction of the roll surface and penetrate through the roll body, and sealing plugs 17 at the end parts of the small cooling water holes.
During casting, cooling water in the cooling water channel 2 enters the roller from the water inlet 25 and is uniformly distributed to the small cooling water holes 21 communicated with the cooling water channel, and the cooling water absorbs heat released by solidification of molten steel on the roller surface when flowing through the small cooling water holes, so that the temperature rises along with the heat and is discharged out of the casting roller from the water outlet 24. Similarly, the cooling water in the cooling water channel 1 enters the roller from the water inlet 14, is uniformly distributed to the small cooling water holes 11 communicated with the roller, and is discharged from the water outlet 15. And the small cooling water holes 11, 21 corresponding to any two cooling water channels are distributed at intervals in the circumferential direction of the casting roll, are not communicated with each other, and the cooling water in the adjacent small cooling water holes 11, 21 has opposite flow directions.
As shown in fig. 4, two water inlets 14, 15 and two water outlets 25, 24 corresponding to the two water inlets 14, 15 are respectively arranged at two ends of the casting roll 1a, wherein a pressure sensor 37, a temperature sensor 38 and a flow regulating valve 51 are arranged on a pipeline of the water outlet 15; accordingly, the water outlet 24 is provided with a pressure sensor 34 and a temperature sensor 33, and a flow control valve 52.
Two water inlets 46, 55 and two water outlets 45, 56 corresponding thereto are provided at both ends of the casting roll 1b, respectively. Wherein, a pressure sensor 39, a temperature transmitter 40 and a flow regulating valve 53 are arranged on the pipeline of the water outlet 45; accordingly, the outlet 56 is provided with a pressure sensor 35 and a temperature sensor 36 and a flow control valve 54.
The method for controlling the flow rate of cooling water for casting rolls according to the present invention will be described below by taking the casting roll 1a as an example:
referring to fig. 4 to 5, a pressure and flow adjustable water pump 30 simultaneously supplies cooling water to the inlets of the two casting rolls 1a, 1b, and first, the flow controller 8 controls the water pump 30 to reach its target pressure (which is derived from the cold test results and allows the flow rate of cooling water of the two casting rolls to approach the target flow fluctuation range) by the water pump driving unit 9. Meanwhile, the flow controller 8 monitors the water flow value q of each cooling water channel fed back by the water outlet flow regulating valves 51 and 52 of each casting roller1、q2And calculating the average value of the cooling water flow in the cooling water channelWherein:
the flow controller 8 compares and bases on q1、q2Andthe difference between the two values sends the opening variation of the regulating valve to the regulating valves 51 and 52 of the corresponding cooling water channels to drive the regulating valves to act, and the flow deviation of the cooling water channels is compensated. Finally, the flow value in each cooling water channel in a single casting roller is equal, namely:
q1＝q2
after the above conditions are satisfied, the flow controller 8 sums the cooling water flow values in the cooling water channels of the single casting roll, and if the total cooling water flow value in the casting roll is not equal to the target cooling water flow Q of the casting roll, the flow controller 8 will control the water pump 30 to change the output pressure P by sending a water pressure deviation signal Δ P to the water pump driving unit 9 until the total cooling water flow of the casting roll is equal to the target flow Q, that is:
Q＝q1+q2(n＝1,2,3......)
the target casting roll cooling water flow rate is a flow range that encompasses a theoretical cooling water flow rate Q that is calculated as needed based on casting process requirements0The fluctuation, namely:
Q∈[Q0±ΔQ]
wherein: Δ Q is the amount of fluctuation deviation allowed by the theoretical cooling water flow rate.
The method is circularly executed in the casting process until the casting is finished.
The method of the invention can ensure that the flow of the cooling water channel in each casting roller is consistent, and the cooling uniformity of the casting rollers is ensured. But for both casting rolls, it is possible to adjust the cooling water flow rate to be the same or different for both casting rolls, as desired.
Claims (7)
1. A method for controlling the flow rate of cooling water for twin-roll strip casting rolls is characterized in that each casting roll has one or more water inlets and one or more water outlets corresponding to the water inlets, and accordingly, one or more independent cooling water channels are formed inside each casting roll; a flow regulating valve is arranged at the water outlet of each cooling water channel, so that the flow of the cooling water in the cooling water channel can be independently regulated, and the consistency of the flow in each cooling water channel in the casting roll is realized; wherein,
by one or more water pumps capable of regulating pressure and flowOne or more pipes supply cooling water to the two casting rolls, stabilize the total flow rate of cooling water for a single casting roll near a target flow rate Q by controlling the pressure of the water pumps, and a flow controller monitors the flow rate value Q of cooling water in each cooling water passage of each casting rollnAnd obtaining the cooling water flow value q in each cooling water channelnAdjusting a corresponding flow adjusting valve according to the deviation of the average value q of the cooling water flow in the cooling water channel to change the cooling water flow in the cooling water channel, and finally realizing the consistency of the flow in each cooling water channel in the casting roll;
if the total flow rate of the cooling water of a single casting roll does not reach the target flow rate Q, the flow controller changes the output pressure P of the water pump so that the total flow rate of the cooling water of each cooling water channel reaches the target flow rate Q.
2. The method for controlling the cooling water flow rate of the twin-roll strip casting rolls according to claim 1, wherein the target cooling water flow rate Q of each casting roll is preset according to process requirements, and the target cooling water flow rates of the two casting rolls may be the same or different; wherein the target cooling water flow Q communicated to the interior of each casting roll is a flow range surrounding a theoretical cooling water flow Q calculated to be required according to the casting process requirements0The fluctuation, namely:
Q∈[Q0±ΔQ]1)
wherein: Δ Q is a fluctuation deviation amount allowed by the theoretical cooling water flow rate, and is the theoretical cooling water flow rate Q02-3% of the total.
3. The method of controlling flow rate of cooling water in twin roll strip casting rolls according to claim 1, wherein a flow control valve is installed at a water outlet of each cooling water passage of the casting rolls, and is capable of adjusting the flow rate of cooling water in the cooling water passage and detecting and transmitting a flow rate value q of cooling water in each cooling water passagenAnd is provided with a detection of the cooling water pressure pnThe device of (1) and an electric signal input/output device; one or more adjustable pressures and flowsThe water pump simultaneously provides cooling water for the two casting rolls, and firstly, the flow controller controls the water pump to reach the target pressure and stabilize the water pump;
then, the flow controller can obtain the cooling water flow value q in each cooling water channel according to the electric signal feedback value at the outlet of a single casting rollernAnd calculating the average value of the cooling water flow in the cooling water passage of the casting rollNamely:
<mrow> <mover> <mi>q</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mrow> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>q</mi> <mi>n</mi> </msub> </mrow> <mi>n</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mn>2</mn> <mo>)</mo> </mrow>
wherein n is the number of cooling water channels in the casting roll, and n is 1,2, 3.;
flow controller according to qnAndthe difference between sends flow control valve aperture variation volume and gives the flow control valve of corresponding cooling water passageway, drives its action, compensates this cooling water passageway flow deviation, finally makes the flow value equal in every cooling water passageway in single casting roll, promptly:
q1＝q2＝q3＝.......＝qnwherein n is 1,2,3.
4. The method of controlling cooling water flow rates of twin roll strip casting rolls according to claim 1, wherein if the total flow rate of cooling water of a single casting roll does not reach the target flow rate Q, the flow controller causes the total flow rate of cooling water of the single casting roll to reach the target flow rate by slightly changing the output pressure P of the water pump, wherein the target flow rate Q is the sum of the flow rates of cooling water passing through the cooling water passages in the casting rolls, that is:
Q＝∑qnwherein n is 1,2,3.
5. The method for controlling flow of cooling water of a twin roll strip casting roll according to claim 1, comprising the steps of:
1) the flow controller is used for controlling the flow rate q of cooling water in each cooling water channel of a single casting rollernCalculating the average value of the cooling water flow in the cooling water passage of the casting rollNamely:
<mrow> <mover> <mi>q</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mrow> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>q</mi> <mi>n</mi> </msub> </mrow> <mi>n</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mn>2</mn> <mo>)</mo> </mrow>
2) the flow controller causes a cooling water flow value q in each cooling water passage in each casting rollnAnd the average valueEquality, i.e. flow controller according to qnAndthe difference value between the opening degree and the flow rate of the cooling water channel is sent to the flow rate regulating valve of the corresponding cooling water channel to drive the flow rate regulating valve to act, the flow rate deviation of the cooling water channel is compensated, finally the flow rate value of the cooling water in each cooling water channel in a single casting roll is equal, q is1＝q2＝q3＝.......＝qnWherein n is 1,2,3.. 3);
3) adjusting the output pressure P of the water pump so that the sum of the flow rates of the cooling water passing through the cooling water passages in each casting roll is equal to a target flow rate Q, which is the sum of the flow rates of the cooling water passing through the cooling water passages in the casting rolls, namely:
Q＝∑qnwherein n is 1,2,3.. 4);
4) and circularly performing the steps until the operation is finished.
6. The method of controlling the flow rate of cooling water in a twin roll strip casting roll according to claim 1, wherein any one of the cooling water passages in the casting roll comprises a water inlet and a water outlet and a plurality of small cooling water holes formed in the roll body so as to be uniformly distributed along the circumference of the roll surface below the roll surface, and wherein the cooling water is introduced into the roll from the water inlet during casting and is uniformly distributed to the small cooling water holes communicating therewith, and the cooling water flows through the small cooling water holes to remove heat released by the solidification of molten steel on the roll surface.
7. The method of controlling the flow rate of cooling water in a twin roll strip casting roll according to claim 6, wherein the small cooling water holes corresponding to any two cooling water passages are spaced apart from each other in the circumferential direction of the casting roll, and the flow directions of cooling water in the adjacent small cooling water holes are opposite to each other.
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| CN105855489B (en) * | 2016-03-31 | 2018-02-16 | 管仁国 | A kind of progressive forming method of liquid metal multiple trunking progressive forming device |
| CN111074060A (en) * | 2019-12-13 | 2020-04-28 | 马鞍山钢铁股份有限公司 | A protective structure for anti-condensation of a water-cooled roller and a method of using the same |
| CN112247086B (en) * | 2020-10-21 | 2022-01-28 | 东北大学 | Working roll device, double-roll thin strip continuous casting equipment and continuous casting production process |
| CN112170795A (en) * | 2020-10-21 | 2021-01-05 | 东北大学 | Work roll mechanism, double-roll thin strip continuous casting equipment and continuous casting production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5823545A (en) * | 1981-07-31 | 1983-02-12 | Nippon Steel Corp | Surface temperature control method for cooling rolls for manufacturing thin strips using molten metal quenching method |
| EP0844084A4 (en) * | 1996-05-02 | 1999-07-21 | Baldwin Nippon Kk | Roller temperature control system |
| CN102260774A (en) * | 2010-05-25 | 2011-11-30 | 上海西重所重型机械成套有限公司 | Water cooling system controlled by multiple parameters |
| JP5608037B2 (en) * | 2010-10-18 | 2014-10-15 | キャストリップ・リミテッド・ライアビリティ・カンパニー | Twin roll type continuous casting machine |
| CN202621572U (en) * | 2012-07-03 | 2012-12-26 | 苏州柏特瑞新材料有限公司 | Three-roll mill cooling system |
| CN103075854B (en) * | 2013-01-08 | 2015-05-20 | 华电电力科学研究院 | Cooling water circulation pump system |
| CN204396077U (en) * | 2015-01-09 | 2015-06-17 | 苏州之诺新材料科技有限公司 | A kind of cooling system of three-roll grinder |
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