CN116871013B - Control flow control method of sand mill production system - Google Patents
Control flow control method of sand mill production system Download PDFInfo
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- CN116871013B CN116871013B CN202310997278.XA CN202310997278A CN116871013B CN 116871013 B CN116871013 B CN 116871013B CN 202310997278 A CN202310997278 A CN 202310997278A CN 116871013 B CN116871013 B CN 116871013B
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- valve
- pressure
- control
- flow
- sand mill
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- 239000004576 sand Substances 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000011010 flushing procedure Methods 0.000 claims description 54
- 238000001514 detection method Methods 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000004891 communication Methods 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 43
- 238000004880 explosion Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
Classifications
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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
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
-
- 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
- B02C23/02—Feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention provides a sand mill production system and a control pressure flow control method, which relate to the technical field of sand mill production and maintenance and aim to solve the problem that the machine seal of a sand mill is damaged due to the fact that the feeding pressure is out of control and exceeds the maximum pressure bearable by the machine seal of the sand mill to a certain extent. The invention provides a sand mill production system, which comprises a buffer tank, a supply component, a pressure control pipeline, a valve control line group and a sand mill, wherein the buffer tank is connected with the supply component; the output end of the buffer tank is connected with the feeding end of the supply component, the valve control line group comprises a control valve group and a conveying pipeline, the output end of the supply component is communicated with the feeding end of the conveying pipeline, the output end of the conveying pipeline is communicated with the feeding end of the sand mill, and the control valve group can open or close the conveying pipeline; one end of the pressure control pipeline is communicated with the feeding end of the conveying pipeline, the other end of the conveying pipeline is communicated with the buffer tank, and the maximum height of the pressure control pipeline is controlled
Description
Technical Field
The invention relates to the technical field of sand mill production and maintenance, in particular to a sand mill production system and a control pressure flow control method.
Background
The sand mill has wide application in industry, and products such as gold tailings, nonferrous metal refining, titanium pigment, precise paint, coal water slurry, ink and the like can be applied to the sand mill to grind the raw materials in nano scale, and then the raw materials can be applied.
One of the sand mills adopts a horizontal single cantilever structure, namely a horizontal sand mill or a horizontal fine mill for short, and the machine seal is fragile in practical application along with the shaft diameter enlargement of the sand mill along with the enlargement of the model, so that the compression resistance of the machine seal is greatly reduced, and the service life of the machine seal is greatly influenced. And, the price of the machine seal is relatively expensive, and once damaged, the machine seal can cause great economic loss.
Therefore, there is an urgent need to provide a sand mill production system and a control pressure and flow control method, so as to solve the problems in the prior art to a certain extent.
Disclosure of Invention
The invention aims to provide a sand mill production system and a control pressure flow control method, which solve the problem that the mechanical seal of a sand mill is damaged due to the fact that the feeding pressure is out of control and exceeds the maximum pressure which can be borne by the mechanical seal of the sand mill to a certain extent.
The invention provides a sand mill production system which comprises a buffer tank, a supply component, a pressure control pipeline, a valve control line group and a sand mill, wherein the buffer tank is connected with the supply component; the output end of the buffer tank is connected with the feeding end of the feeding member, the valve control line group comprises a control valve group and a conveying pipeline, the output end of the feeding member is communicated with the feeding end of the conveying pipeline, the output end of the conveying pipeline is communicated with the feeding end of the sand mill, and the control valve group can open or close the conveying pipeline; one end of the pressure control pipeline is communicated with the feeding end of the conveying pipeline, the other end of the pressure control pipeline is communicated with the buffer tank, and the maximum height of the pressure control pipeline is equal to the maximum height of the buffer tank
The sand mill production system provided by the invention further comprises a control terminal, wherein the control valve group comprises a cut-off valve group; the cutoff valve group comprises a cutoff valve, a first pressure detection piece and a first flow detection piece, wherein the cutoff valve is arranged on the conveying pipeline, and the first pressure detection piece and the first flow detection piece are both connected with the cutoff valve and can detect the inlet pressure and the flow of the cutoff valve; the first pressure detection piece and the first flow detection piece are both in communication connection with the control terminal, and the control terminal is in communication connection with the cut-off valve so as to control the cut-off valve to open or cut off the conveying pipeline.
Specifically, the control valve group further comprises a flushing valve group; the flushing valve group comprises a flushing valve and a water supply pipeline, the flushing valve is arranged on the water supply pipeline and is communicated with the conveying pipeline, and the flushing valve group is arranged at the downstream of the cut-off valve group; the control terminal is in communication connection with the flush valve to open or shut off the water supply line.
Further, the flushing valve group further comprises a water supply member, and the water supply member is communicated with a water inlet of the water supply pipeline.
Further, the shut-off valve includes a primary valve portion and a secondary valve portion; the main valve part is arranged on the conveying pipeline, the secondary valve part is in communication connection with the control terminal, and the secondary valve part can control the opening or closing of the main valve part.
Still further, the shut-off valve further comprises an air supply member; the secondary valve part is a three-way air gauge needle valve or a three-way electromagnetic valve, the main valve part is a pipe clamp valve, the output end of the air supply component is communicated with the first end of the secondary valve part, the second end of the secondary valve part is communicated with the main valve part, and the third end of the secondary valve part is communicated with the outside.
The control valve group further comprises a second flow detection piece and a second pressure detection piece, wherein the second flow detection piece is arranged on the conveying pipeline and is positioned at the downstream of the flushing valve group, and the second pressure detection piece is arranged on the conveying pipeline and is positioned at the downstream of the second flow detection piece; the second flow detection piece and the second pressure detection piece are both in communication connection with the control terminal.
Specifically, the control valve assembly further includes a manual adjustment valve positioned between the second flow sensing member and the second pressure sensing member.
Further, the pressure control pipeline is a U-shaped pipe.
Compared with the prior art, the sand mill production system provided by the invention has the following advantages:
The invention provides a sand mill production system, which comprises a buffer tank, a supply component, a pressure control pipeline, a valve control line group and a sand mill, wherein the buffer tank is connected with the supply component; the output end of the buffer tank is connected with the feeding end of the supply component, the valve control line group comprises a control valve group and a conveying pipeline, the output end of the supply component is communicated with the feeding end of the conveying pipeline, the output end of the conveying pipeline is communicated with the feeding end of the sand mill, and the control valve group can open or close the conveying pipeline; one end of the pressure control pipeline is communicated with the feeding end of the conveying pipeline, the other end of the pressure control pipeline is communicated with the buffer tank, and the maximum height of the pressure control pipeline
From this analysis, it is found that a stable material supply can be provided to the overall system by the buffer tank, while the material is output to the conveying line via the supply member by communicating the feed end of the supply member with the buffer tank and the output end with the feed end of the conveying line. Further, the material can enter the sand mill through the communication of the conveying pipeline and the feeding end of the sand mill, so that the material is supplied.
In the application, the feeding end of the conveying pipeline is also communicated with the pressure control pipeline, and the maximum height of the pressure control pipelineTherefore, when the pressure of the material conveyed by the feeding component is overlarge and approaches the maximum pressure borne by the machine seal of the sand mill, the material can continuously rise in the pressure control pipeline and flow back into the buffer tank beyond the maximum height of the pressure control pipeline, so that the pressure is stabilized and the pressure is relieved.
It can be understood that the maximum height of the pressure control pipeline does not exceed the ratio of the maximum pressure which can be borne by the mechanical seal of the sand mill to the specific gravity of the materials, so that the pressure which reaches the backflow of the materials in the pressure control pipeline can be ensured not to exceed the maximum pressure which can be borne by the mechanical seal of the sand mill all the time, and the problem of damage to the mechanical seal of the sand mill caused by the fact that the pressure exceeds the maximum pressure which can be borne by the mechanical seal of the sand mill due to the uncontrolled feeding pressure can be avoided to a certain extent.
In addition, the invention also provides a flow control and control method for the sand mill production system, which comprises the following steps: detecting the pressure and the flow of the conveying pipeline through the first pressure detecting piece and the first flow detecting piece, and controlling the opening and closing of the cut-off valve and the flushing valve through the control terminal when the pressure value and/or the flow value deviate from a set threshold value; controlling the shut-off valve and the flushing valve to restore to the initial state after the shut-off valve and the flushing valve are kept in the state in the first step for a certain time, and detecting the pressure and the flow again, wherein when the shut-off valve and the flushing valve are qualified, the shut-off valve and the flushing valve are kept in the initial state, and when the shut-off valve and the flushing valve are unqualified, the shut-off valve and the flushing valve are controlled to be opened and closed according to detected data; and step three, when the detection data are unqualified, repeating the step two, wherein the repetition times are more than three times, and when the detection data are unqualified after the step two is repeated, controlling the sand mill to stop working.
By adopting the control pressure flow control method for the sand mill production system, provided by the application, on the basis of ensuring that the pressure of the whole system does not exceed the maximum pressure borne by the machine seal of the sand mill, the opening and closing control of the cut-off valve and the charging valve can be realized through the detection of the feeding pressure and the feeding flow of the conveying pipeline, so that the operation stability of the sand mill is realized, the problems of overheat explosion and blockage of slurry in the sand mill caused by overpressure, cutoff and large or small flow are avoided, and the service life and the operation stability of the sand mill are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a sand mill production system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a shut-off valve set in a sand mill production system according to an embodiment of the present invention;
Fig. 3 is a schematic flow chart of a method for controlling a voltage-controlled flow according to an embodiment of the present invention;
fig. 4 is a logic control diagram of a voltage control flow control method according to an embodiment of the present invention.
In the figure: 1-a buffer tank; 2-a supply member; 3-a pressure control pipeline; 4-a conveying pipeline; 5-cutting off the valve group; 501-a main valve portion; 502-a secondary valve portion; 503-an air supply member; 6-a flush valve; 601-a water supply line; 602-a water supply member; 7-a second pressure detecting member; 8-a second flow detector; 9-manual adjustment valve; 10-sand mill.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
In describing embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. refer to an azimuth or a positional relationship based on that shown in the drawings, or that the inventive product is conventionally put in place when used, merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "coupled" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.
For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.
Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.
The features of the examples described herein may be combined in various ways that will be apparent upon an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
As shown in fig. 1, the present invention provides a sand mill production system, comprising a buffer tank 1, a supply member 2, a pressure control pipeline 3, a valve control line group and a sand mill 10; the output end of the buffer tank 1 is connected with the feeding end of the feeding member 2, the valve control line group comprises a control valve group and a conveying pipeline 4, the output end of the feeding member 2 is communicated with the feeding end of the conveying pipeline 4, the output end of the conveying pipeline 4 is communicated with the feeding end of the sand mill 10, and the control valve group can open or close the conveying pipeline 4; one end of the pressure control pipeline 3 is communicated with the feeding end of the conveying pipeline 4, the other end of the pressure control pipeline 3 is communicated with the buffer tank 1, and the maximum height of the pressure control pipeline 3
Compared with the prior art, the sand mill production system provided by the invention has the following advantages:
The sand mill production system provided by the invention can provide stable material supply for the whole system through the buffer tank 1, and the material is output to the conveying pipeline 4 through the supply component 2 by enabling the feeding end of the supply component 2 to be communicated with the buffer tank 1 and the output end to be communicated with the feeding end of the conveying pipeline 4. Further, the material can enter the sand mill 10 through the communication of the conveying pipeline 4 and the feeding end of the sand mill 10, so that the material can be supplied.
In the application, the feeding end of the conveying pipeline 4 is also communicated with the pressure control pipeline 3, and the maximum height of the pressure control pipeline 3And the maximum height unit of the pressure control pipeline 3 is meter and takes an integer value, so when the pressure of the material conveyed by the feeding component 2 is overlarge and approaches to the maximum pressure carried by the machine seal of the sand mill 10, the material can continuously rise in the pressure control pipeline 3 and flow back into the buffer tank 1 beyond the maximum height of the pressure control pipeline 3, and the pressure is stabilized and relieved.
It can be understood that, because the maximum height of the pressure control pipeline 3 in the application takes an integer value, the maximum height can be always ensured not to exceed the ratio of the maximum pressure which can be borne by the machine seal of the sand mill 10 to the specific gravity of the material, and therefore, the pressure which reaches the backflow of the material in the pressure control pipeline 3 can be always ensured not to exceed the maximum pressure which can be borne by the machine seal of the sand mill 10, thereby avoiding the problem that the machine seal of the sand mill 10 is damaged due to the fact that the feeding pressure is out of control, the pressure exceeds the maximum pressure which can be borne by the machine seal of the sand mill 10 to a certain extent.
The maximum height of the pressure control pipeline 3 is determined by taking the maximum pressure which can be borne by the machine seal of the sand mill 10 as 0.2Mpa and the specific gravity of the material as 1.5 as an exampleWherein 1 mpa=10 bar and the weight of one atmosphere per unit area is approximately equal to the weight of 10m high water, i.e. 1 bar=10 m water column, so that the height of water that the seal can carry is 20m, calculated on the basis of the above parameters, whereas the specific gravity of the water is 1, the specific gravity of the material is 1.5, so that the maximum height of the pressure control line 3 is calculatedI.e. the maximum height of the pressure control line 3 is 13.33 meters. However, since H is an integer in the present application, H does not exceed the actually calculated value, and thus H is determined to be 13 meters under the above parameters.
When H is 13 m, the material can flow back when the pressure in the pressure control pipeline 3 reaches 0.195Mpa, which is lower than the maximum bearing pressure of the mechanical seal by 0.2Mpa, so that the mechanical seal can be ensured not to be damaged due to overhigh pressure.
Preferably, the pressure control pipeline 3 in the application is a U-shaped pipe.
Optionally, as shown in fig. 1, the sand mill production system provided by the invention further comprises a control terminal, wherein the control valve group comprises a cutoff valve group 5; the cutoff valve group 5 comprises a cutoff valve, a first pressure detecting piece and a first flow detecting piece, the cutoff valve is arranged on the conveying pipeline 4, and the first pressure detecting piece and the first flow detecting piece are both connected with the cutoff valve and can detect the inlet pressure and the flow of the cutoff valve; the first pressure detecting member and the first flow detecting member are both in communication connection with a control terminal, which is in communication connection with the shut-off valve to control the shut-off valve to open or shut off the delivery pipe 4.
The control terminal can adopt a PLC or DCS system for remote control, the feeding pressure and the feeding speed of the output pipeline can be detected through the first pressure detecting piece and the first flow detecting piece, detected data are transmitted to the control terminal, and the control terminal controls the opening or closing of the cut-off valve according to the detected data, so that the cutting-off or opening of the conveying pipeline 4 is realized.
It will be appreciated that since the outlet of the sander 10 is provided with a screen, when the feed pressure is too high to exceed the threshold pressure of the shut-off valve or the flow rate is greatly increased beyond the feed flow rate threshold, the sander 10 cannot adequately grind the supplied material and the insufficiently ground material cannot flow out through the screen, thereby causing clogging of the material. According to the application, the control terminal controls the shut-off valve to be closed, so that the conveying pipeline 4 is shut off, and the feeding is stopped, and further the problem that the sand mill 10 cannot sufficiently grind materials and the materials are blocked due to the fact that the material conveying flow is too high due to the fact that the pressure is too high can be avoided to a certain extent.
It should be noted here that the sand mill production system provided by the present application actually has three pressure values, namely, the normal operating pressure of the sand mill 10, the threshold pressure of the shut-off valve, and the feed pressure. Since the feed pressure is required to overcome the resistance created by the operation of the sander 10, the feed pressure needs to be above the threshold pressure so that the material can enter the delivery line 4 smoothly without exceeding the threshold pressure.
When the material is conveyed and kept at the operating pressure, the whole system operates normally, and when the feeding pressure entering the conveying pipeline 4 exceeds the threshold pressure, the control terminal controls the cut-off valve to be closed to cut off the feeding of the conveying pipeline 4, so that the problems that the sand mill 10 is blocked or the heat cannot be brought out to cause explosion due to excessive grinding or insufficient grinding are avoided.
Since the output end of the conveying pipeline 4 is connected with the pressure control pipeline 3, when the material is fed at a preset feeding pressure, the material always exists in the pressure control pipeline 3, but the material does not exceed the maximum height of the pressure control pipeline 3. When the feeding pressure is increased due to misoperation, the materials in the pressure control pipeline 3 can continuously rise until the materials flow back into the buffer tank 1 beyond the maximum height, so that the whole system can be always ensured to work under a fixed feeding pressure.
Optionally, as shown in fig. 1, the control valve set in the present application further includes a flushing valve set; the flushing valve group comprises a flushing valve 6 and a water supply pipeline 601, the flushing valve 6 is arranged on the water supply pipeline 601, and the water supply pipeline 601 is communicated with the conveying pipeline 4; the control terminal is communicatively connected to the flush valve 6 to turn on or off the water supply line 601.
When the feeding flow is too large and exceeds the threshold value, after the control terminal controls the shut-off valve to be closed, the control terminal can further control the flushing valve 6 to be opened, so that water can be supplied to the conveying pipeline 4 through the water supply pipeline 601, the slurry in the sand mill 10 is diluted, the insufficiently ground materials in the sand mill 10 can be ground again to the qualified particle size, and the materials flow out from the outlet screen of the sand mill 10.
When the feed rate is too low below the threshold, the material entering the sand mill 10 is too low, and the material in the sand mill 10 is excessively ground under the same operation parameters, so that the sand mill 10 rapidly releases heat, and the heat cannot be carried out by the material, thereby causing explosion. Therefore, in this state, the cut-off valve is always kept in an open state, and the control terminal controls the flushing valve 6 to be opened, so that water can be supplied to the conveying pipeline 4 through the water supply pipeline 601, heat in the sand mill 10 can be carried out, and the problem of explosion caused by overheating can be avoided.
It will be appreciated that when the feed pressure is too high, the feed flow will be too high, and therefore, it is necessary to control the shut-off valve to close, control the flush valve 6 to open, dilute the material, and after a certain period of closing, then open the shut-off valve, close the flush valve 6, and continue the pressure and flow detection, and when the normal pressure and flow are restored, the sander 10 will be restored to the normal operating state again, and if the pressure and flow still exceed the threshold, the shut-off valve will be controlled again to close, the flush valve 6 will be opened, and the above actions will be repeated until the pressure and flow are restored to the normal range.
It should be noted that, when the pressure and flow detected by repeating the above actions for a plurality of times still exceeds the threshold value, other non-adjustable faults of the whole system are proved, and the sand mill 10 needs to be controlled to stop working for maintenance.
Optionally, as shown in fig. 1, the flushing valve set in the present application further includes a water supply member 602, and the water supply member 602 is in communication with the water inlet of the water supply line 601.
The water supply means 602 in the present application may be a water pump, and the water supply in the delivery pipe 4 is realized by opening and closing the flush valve 6 by pumping an external water source into the water supply pipe 601.
Alternatively, as shown in fig. 1 in combination with fig. 2, the shut-off valve in the present application includes a main valve portion 501 and a sub-valve portion 502; the main valve portion 501 is provided on the delivery pipe 4, the sub-valve portion 502 is connected in communication with a control terminal, and the sub-valve portion 502 can control the opening or closing of the main valve portion 501.
Preferably, the secondary valve portion 502 in the present application is a three-way air gauge needle valve or a three-way electromagnetic valve, the main valve portion 501 is a pinch valve, the shut-off valve further includes an air supply member 503, an output end of the air supply member 503 is communicated with a first end of the secondary valve portion 502, a second end of the secondary valve portion 502 is communicated with the main valve portion 501, and a third end of the secondary valve portion 502 is communicated with the outside.
The sand mill production system mainly aims at solid particle materials, so that the main valve part 501 of the cut-off valve adopts the pipe clamp valve, on one hand, the problem of blockage of the cut-off valve can be avoided, and on the other hand, the installation volume of the pipe clamp valve is smaller and is similar to the size of a conveying pipeline, so that the sand mill production system can be better adapted.
Accordingly, the secondary valve 502 of the present application adopts a three-way air gauge needle valve or a three-way solenoid valve, and can replace the disadvantage of large installation volume and high cost caused by directly installing the pneumatic head on the pinch valve.
In the shut-off valve structure provided by the application, the first end of the secondary valve part 502 is communicated with the output end of the air supply member 503, and the second end is communicated with the main valve part 501, so that compressed air can be introduced into the compression cavity of the pinch valve through the secondary valve part 502, thereby realizing flattening and compaction of the inner wall hose of the pinch valve, and further cutting off the passage of materials.
When the main valve portion 501 is required to be opened, the sub-valve portion 502 is closed, and the third end of the sub-valve portion 502 is communicated with the outside, so that air in the compression chamber of the pinch valve can be discharged from the third end of the sub-valve portion 502, thereby opening the main valve portion 501.
Optionally, as shown in fig. 1, the control valve set in the present application further includes a second flow detecting element 8 and a second pressure detecting element 7, where the second flow detecting element 8 is disposed on the conveying pipeline 4 and is located downstream of the flushing valve set, and the second pressure detecting element 7 is disposed on the conveying pipeline 4 and is located downstream of the second flow detecting element 8; the second flow detection piece 8 and the second pressure detection piece 7 are both in communication connection with the control terminal, and the second pressure detection piece 7 and the second flow detection piece 8 are further arranged on the conveying pipeline 4, so that pressure and flow data can be provided for the control terminal, the auxiliary control terminal controls the cut-off valve and the flushing valve 6, and the running stability of the whole system is ensured.
Optionally, as shown in fig. 1, the control valve set in the present application further includes a manual adjustment valve 9, and the manual adjustment valve 9 is located between the second flow rate detecting member 8 and the second pressure detecting member 7.
The fine adjustment of the feeding amount can be realized by arranging the manual adjusting valve 9 on the conveying pipeline 4, so that accurate feeding is ensured. In addition, when a plurality of sand mills 10 are simultaneously fed, the resistances in each set of system are different due to different pipeline distances, so that the flow rate can be finely adjusted through the manual adjusting valve 9, and the stability of the feeding pressure and the flow rate of the sand mills 10 is ensured.
In addition, as shown in fig. 3 and fig. 4, the invention further provides a control pressure flow control method for the sand mill production system, which comprises the following steps: detecting the pressure and the flow of a conveying pipeline through a first pressure detecting piece and a first flow detecting piece, and controlling the opening and closing of a shut-off valve and a flushing valve 6 through a control terminal when the pressure value and/or the flow value deviate from a set threshold value; step two, after the state of the cut-off valve and the flushing valve 6 in the step one is kept for a certain time, the cut-off valve and the flushing valve 6 are controlled to be restored to the initial state, pressure and flow detection is carried out again, when the cut-off valve and the flushing valve 6 are qualified, the cut-off valve and the flushing valve 6 are kept in the initial state, and when the cut-off valve and the flushing valve 6 are unqualified, the opening and the closing of the cut-off valve and the flushing valve 6 are controlled according to the detected data; and step three, when the detection data are unqualified, repeating the step two, wherein the repetition times are more than three times, and when the detection data are unqualified after the step two is repeated, controlling the sand mill 10 to stop working.
By adopting the control pressure flow control method for the sand mill production system, provided by the application, on the basis of ensuring that the pressure of the whole system does not exceed the maximum pressure borne by the machine seal of the sand mill 10, the opening and closing control of the cut-off valve and the charging valve can be realized through the detection of the feeding pressure and the feeding flow of the conveying pipeline 4, so that the operation stability of the sand mill 10 is realized, the problems of overheat explosion and blockage of slurry in the sand mill 10 caused by overpressure, cutoff and large flow or small flow are avoided, and the service life and the operation stability of the sand mill 10 are ensured.
It will be appreciated that the initial state of the shut-off valve and flush valve 6 of the present application described above is a state in which the shut-off valve is open, the flush valve 6 is closed, and the delivery line 4 is feeding. When the pressure value or the flow value detected in the first step exceeds the threshold value, the control terminal controls the cut-off valve to be closed, the flushing valve 6 is opened, the conveying pipeline 4 is not fed any more, the material flows back into the buffer tank 1 from the pressure control pipeline 3, and water can be supplied into the conveying pipeline 4 through the opening of the flushing valve 6, so that the material is diluted, and the material in the sand mill 10 can be fully ground gradually and finally discharged.
After the shut-off valve is closed for a certain time, and the closing time in the application is 100-300 seconds, the control terminal opens the shut-off valve again, closes the flushing valve 6, resumes normal feeding, and when the values detected by the first pressure detecting member and the first flow detecting member are restored below the threshold value, the system is proved to resume the normal operation state. If the pressure and flow values still exceed the threshold values, the shut-off valve is closed again and the flushing valve 6 is opened. If the above operation is repeated three times or more and the detected data cannot be reduced to the threshold value or less, the operation of the sander 10 is controlled to be stopped for maintenance, and if the data is repeated three times or less and the data is restored to the threshold value or less, the sander 10 continues the normal operation.
Correspondingly, when the pressure value or the flow value detected in the first step is too small and is lower than the threshold value, the cut-off valve still keeps on, and the control terminal opens the flushing valve 6 to supply water into the conveying pipeline 4, so that the heat of the sand mill 10 is carried out.
After the water is supplied for a certain time, the water supply time can be 100-300 seconds, the control terminal closes the flushing valve 6, detects whether the pressure and the flow rate are restored to normal values, if the pressure and the flow rate are restored to normal values, the system continues to work normally, if the pressure and the flow rate are not restored to normal values, the operation is continuously repeated, the flushing valve 6 is opened, and if the pressure and the flow rate are not restored for more than three times, the sand mill 10 is controlled to stop working for maintenance.
Therefore, by the sand mill production system and the control pressure flow control method aiming at the production system, the risk of damage of the sand mill 10 in mechanical sealing can be reduced to a certain extent, the system can be adjusted according to the pressure and flow in actual operation, the running stability of the whole system is ensured, and the problem of blockage or overheat explosion of the sand mill 10 is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The control pressure flow control method of the sand mill production system is characterized in that the sand mill production system comprises a buffer tank, a supply component, a pressure control pipeline, a valve control line group and a sand mill;
The output end of the buffer tank is connected with the feeding end of the feeding member, the valve control line group comprises a control valve group and a conveying pipeline, the output end of the feeding member is communicated with the feeding end of the conveying pipeline, the output end of the conveying pipeline is communicated with the feeding end of the sand mill, and the control valve group can open or close the conveying pipeline;
One end of the pressure control pipeline is communicated with the feeding end of the conveying pipeline, the other end of the pressure control pipeline is communicated with the buffer tank, and the maximum height of the pressure control pipeline is equal to the maximum height of the buffer tank
The maximum height unit of the pressure control pipeline is meter, and an integer value is taken;
the control valve group comprises a cut-off valve group;
The cutoff valve group comprises a cutoff valve, a first pressure detection piece and a first flow detection piece, wherein the cutoff valve is arranged on the conveying pipeline, and the first pressure detection piece and the first flow detection piece are both connected with the cutoff valve and can detect the inlet pressure and the flow of the cutoff valve;
the first pressure detection piece and the first flow detection piece are both in communication connection with the control terminal, and the control terminal is in communication connection with the cut-off valve so as to control the cut-off valve to open or cut off the conveying pipeline;
The control valve group also comprises a flushing valve group;
The flushing valve group comprises a flushing valve and a water supply pipeline, the flushing valve is arranged on the water supply pipeline and is communicated with the conveying pipeline, and the flushing valve group is arranged at the downstream of the cut-off valve group;
the control terminal is in communication connection with the flushing valve to open or shut off the water supply pipeline;
the control and pressure control flow method comprises the following steps:
detecting the pressure and the flow of the conveying pipeline through the first pressure detecting piece and the first flow detecting piece, and controlling the opening and closing of the cut-off valve and the flushing valve through the control terminal when the pressure value and/or the flow value deviate from a set threshold value;
When the feeding flow is too large and exceeds a threshold value, the control terminal controls the shut-off valve to be closed, and then the control terminal can further control the flushing valve to be opened;
When the feeding flow is too small and is lower than the threshold value, the cut-off valve is always kept in an open state, and the control terminal controls the flushing valve to be opened;
Step two, after the state of the cut-off valve and the flushing valve in the step one is kept for a certain time, controlling the cut-off valve and the flushing valve to restore to an initial state, wherein the initial state is a state that the cut-off valve is opened, the flushing valve is closed, a conveying pipeline is fed, pressure and flow detection is carried out again, when the cut-off valve and the flushing valve are qualified, the cut-off valve and the flushing valve are kept in the initial state, and when the cut-off valve and the flushing valve are unqualified, the opening and the closing of the cut-off valve and the flushing valve are controlled according to detected data;
And step three, when the detection data are unqualified, repeating the step two, and when the detection data are unqualified after repeating the step two, controlling the sand mill to stop working, wherein the repetition times are more than three times.
2. The method of controlling pressure of a fluid according to claim 1, wherein the flush valve assembly further comprises a water supply member in communication with a water inlet of the water supply line.
3. The method of controlling pressure and flow according to claim 1, wherein the shut-off valve includes a primary valve portion and a secondary valve portion;
the main valve part is arranged on the conveying pipeline, the secondary valve part is in communication connection with the control terminal, and the secondary valve part can control the opening or closing of the main valve part.
4. The method of controlling pressure and flow according to claim 3, wherein the shut-off valve further comprises an air supply member;
The secondary valve part is a three-way air gauge needle valve or a three-way electromagnetic valve, the main valve part is a pipe clamp valve, the output end of the air supply component is communicated with the first end of the secondary valve part, the second end of the secondary valve part is communicated with the main valve part, and the third end of the secondary valve part is communicated with the outside.
5. The method of controlling pressure and flow according to claim 1, wherein the control valve block further comprises a second flow detection member and a second pressure detection member, the second flow detection member being disposed on the delivery line downstream of the flushing valve block, the second pressure detection member being disposed on the delivery line downstream of the second flow detection member;
the second flow detection piece and the second pressure detection piece are both in communication connection with the control terminal.
6. The method of controlling pressure of claim 5, wherein the control valve block further comprises a manual adjustment valve positioned between the second flow sensing member and the second pressure sensing member.
7. The method of controlling pressure of a fluid according to claim 1, wherein the pressure control line is a U-shaped tube.
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