Cooling water system for hard alloy composite roller

Abstract

The invention discloses a hard alloy composite roller cooling water system which comprises a frequency conversion water supply pump, a double-barrel filter, a first bypass, a first manual valve, a stop valve, a second manual valve, a third manual valve, an online water quality monitoring water taking mechanism, a measuring instrument and a water distribution bag. The variable-frequency water supply pump is communicated with the double-barrel filters, the first bypass is arranged on one side of the double-barrel filters, the double-barrel filters are connected in parallel, the double-barrel filters are sequentially communicated with the first manual valve, the stop valve and the second manual valve, and the water inlet end of the third manual valve is communicated with the water inlet end of the first manual valve. The water outlet end of the third manual valve is communicated with the water outlet end of the second manual valve, the second manual valve is communicated with the measuring instrument, and an online water quality monitoring water taking mechanism is arranged on a pipeline between the second manual valve and the measuring instrument, and has the advantages that the service life of the roller is prolonged, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cooling of a cemented carbide composite roll, in particular to a cooling water system for a cemented carbide composite roll. Background Art

[0002] With the increasingly fierce competition in the steel market, steel enterprises are constantly updating their equipment level and improving the rolling speed of rolling mills. At the same time, they are using cemented carbide composite rolls to reduce the number of mill shutdowns and further improve the effective operation rate of rolling mills. With the large-scale promotion and application of cemented carbide composite rolls, the corresponding cooling water system is still using the cooling water system of ordinary rolls, which has brought a series of problems, such as thermal cracks, cracking, scrapping, and severe corrosion of the roll ring. Since cemented carbide composite rolls are expensive, a series of problems caused by the cooling water system need to be solved urgently.

[0003] The present application provides a cooling water system for a cemented carbide composite roll to solve the above-mentioned problem. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, with the large-scale promotion and application of cemented carbide composite rolls, the corresponding supporting cooling water system is still using the cooling water system of ordinary rolls, which brings a series of problems, such as: roller ring thermal cracks, cracking, scrapping, severe corrosion, etc., so a cemented carbide composite roll cooling water system is provided, and the cemented carbide composite roll cooling water system comprises: A variable frequency water supply pump, a double barrel filter, a first bypass, a first manual valve, a shut-off valve, a second manual valve, a third manual valve, an online water quality monitoring water intake mechanism, a measuring instrument and a water distribution bag, wherein the variable frequency water supply pump is connected to the double barrel filter, the first bypass is arranged on one side of the double barrel filter, the double barrel filters are connected in parallel, the double barrel filter is sequentially connected to the first manual valve, the shut-off valve and the second manual valve, the water inlet end of the third manual valve is connected to the water inlet end of the first manual valve, the water outlet end of the third manual valve is connected to the water outlet end of the second manual valve, the second manual valve is connected to the measuring instrument, an online water quality monitoring water intake mechanism is arranged on the pipeline between the second manual valve and the measuring instrument, the measuring instrument is connected to the water distribution bag, and the water distribution bag is connected to the cooling nozzle assembly through a hose.

[0005] Furthermore, the double-barrel filter includes: a first barrel body and a second barrel body, the first barrel body and the second barrel body have the same structure, two connecting pipes are arranged between the first barrel body and the second barrel body, an electric three-way valve for water inlet is arranged on the connecting pipe on the upper side, and an electric three-way valve for water outlet is arranged on the connecting pipe on the lower side, and connecting valves are arranged in parallel at the water inlet three-way valve and the water outlet three-way valve.

[0006] Furthermore, an exhaust valve is disposed at the upper end of the first barrel body, a vent valve is disposed at the lower end of the first barrel body, a filter is disposed inside the first barrel body, and a pressure difference transmitter is disposed on the side of the first barrel body.

[0007] Furthermore, the cooling nozzle assembly includes a first upper roller ring cooling nozzle assembly, a second upper roller ring cooling nozzle assembly, a first lower roller ring cooling nozzle assembly and a second lower roller ring cooling nozzle assembly, and the first upper roller ring cooling nozzle assembly, the second upper roller ring cooling nozzle assembly, the first lower roller ring cooling nozzle assembly and the second lower roller ring cooling nozzle assembly are all connected to the water distribution bag.

[0008] Further, the first upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring close to the exit guide, and the second upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring away from the exit guide.

[0009] Further, the first lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring close to the exit guide, and the second lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring away from the exit guide.

[0010] Furthermore, the rated flow rate of the variable frequency water supply pump is greater than or equal to 30ab m³ / h, and the head of the variable frequency water supply pump is greater than or equal to 80m.

[0011] Furthermore, the accuracy of the filter is less than or equal to 200 μm.

[0012] Furthermore, the first bypass includes a fourth manual valve, a first electric valve and a fifth manual valve, the fourth manual valve, the first electric valve and the fifth manual valve are connected in sequence, the water inlet end of the fourth manual valve is connected to the water inlet electric three-way valve of the double-barrel filter, and the water outlet end of the fifth manual valve is connected to the water outlet electric three-way valve of the double-barrel filter.

[0013] The implementation of the present invention has the following beneficial effects: 1. The present invention can control the roller temperature during production below 40°C by designing the water channel, greatly enhancing the cooling effect of cooling water during the use of the cemented carbide composite roller, extending the roller service life, improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present invention; Figure 2 It is the structural diagram of the double barrel filter; Figure 3 This is a structural diagram of the cooling nozzle assembly. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Please refer to the instruction manual Figure 1-3 The present embodiment provides a cooling water system for a cemented carbide composite roll, the cooling water system for a cemented carbide composite roll comprising:

[0017] A variable frequency water supply pump, a double barrel filter, a first bypass, a first manual valve, a shut-off valve, a second manual valve, a third manual valve, an online water quality monitoring water intake mechanism, a measuring instrument and a water distribution package. The variable frequency water supply pump is connected to the double barrel filter, the first bypass is arranged on one side of the double barrel filter, the double barrel filters are connected in parallel, the double barrel filter is sequentially connected to the first manual valve, the shut-off valve and the second manual valve, the water inlet end of the third manual valve is connected to the water inlet end of the first manual valve, the water outlet end of the third manual valve is connected to the water outlet end of the second manual valve, the second manual valve is connected to the measuring instrument, an online water quality monitoring water intake mechanism is arranged on the pipeline between the second manual valve and the measuring instrument, the measuring instrument is connected to the water distribution package, and the water distribution package is connected to the cooling nozzle assembly through a hose; the measuring instrument includes a flow meter, a pressure gauge and a thermometer.

[0018] The double-barrel filter includes: a first barrel body 1 and a second barrel body, the first barrel body 1 and the second barrel body have the same structure, two connecting pipes are arranged between the first barrel body 1 and the second barrel body, an electric three-way valve 6 for water inlet is arranged on the connecting pipe on the upper side, and an electric three-way valve 8 for water outlet is arranged on the connecting pipe on the lower side, and connecting valves 7 are arranged in parallel at both the water inlet three-way valve and the water outlet three-way valve.

[0019] An exhaust valve 2 is disposed at the upper end of the first barrel body 1 , a vent valve 3 is disposed at the lower end of the first barrel body 1 , a filter screen 4 is disposed inside the first barrel body 1 , and a pressure difference transmitter 5 is disposed on the side of the first barrel body 1 .

[0020] The cooling nozzle assembly includes a first upper roller ring cooling nozzle assembly 9, a second upper roller ring cooling nozzle assembly 10, a first lower roller ring cooling nozzle assembly 11 and a second lower roller ring cooling nozzle assembly 12. The first upper roller ring cooling nozzle assembly 9, the second upper roller ring cooling nozzle assembly 11, the first lower roller ring cooling nozzle assembly 10 and the second lower roller ring cooling nozzle assembly 12 are all connected to the water distribution package.

[0021] The first upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring close to the exit guide, and the second upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring away from the exit guide.

[0022] The first lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring close to the exit guide, and the second lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring away from the exit guide.

[0023] The rated flow rate of the variable frequency water supply pump is greater than or equal to 30ab m³ / h, and the head of the variable frequency water supply pump is greater than or equal to 80m.

[0024] The accuracy of the filter 4 is less than or equal to 200 μm.

[0025] The first bypass includes a fourth manual valve, a first electric valve and a fifth manual valve, which are connected in sequence, a water inlet end of the fourth manual valve is connected to the water inlet electric three-way valve 6 of the double-barrel filter, and a water outlet end of the fifth manual valve is connected to the water outlet electric three-way valve 8 of the double-barrel filter.

[0026] In the specific production process: Assume that the production specification is a cutting, and the number of rolling mills using carbide rollers is b.

[0027] For the corresponding rolling mill using carbide rollers, a separate turbid water supply is set up for water supply, and a variable frequency water supply pump is set up at the water tank for water supply. The rated flow of the variable frequency water supply pump is ≥ 30ab m³ / h, and the head needs to be ≥ 80 m.

[0028] The pipeline is equipped with a corresponding special valve group, which includes a shut-off valve, a first manual valve, a second manual valve and a third manual valve. The shut-off valve is used to control the opening and closing of the waterway. The first manual valve and the second manual valve are respectively provided before and after the shut-off valve for maintenance. A bypass pipeline is also provided, and a third manual valve is provided on the bypass pipeline for emergency water supply. The shut-off valve is equipped with a delayed closing function. When the production stops and the cooling water needs to be shut off, the shut-off valve will be closed after a delay of 5 minutes to fully cool and prevent temperature reversal.

[0029] The solid particles in the cooling water act like abrasives during rolling, corroding the bonding phase in the roll ring, which will cause the micro cracks in the rolling groove to expand and extend rapidly. Therefore, a double barrel filter is set in front of the valve group. The double-pass filter is divided into a first barrel body and a second barrel body. The first barrel body and the second barrel body are provided with a connecting pipe. The connecting pipe on the upper side is provided with a water inlet electric three-way valve, and the connecting pipe on the lower side is provided with a water outlet electric three-way valve; A first bypass is arranged beside the double barrel filter, the first bypass comprises a fourth manual valve, a first electric valve and a fifth manual valve, and the fourth manual valve and the fifth manual valve are used for maintenance; The double-barrel filter is equipped with a pressure difference alarm. When the pressure difference between the first barrel body and the second barrel body is ≥0.25 MPa, an alarm will be issued, and the first electric valve in the first bypass will be automatically opened, and then the filter will automatically switch to the second barrel body / first barrel body. After the switch is completed, the first electric valve will be closed.

[0030] A connecting valve is also provided on the connecting pipe. On the one hand, it can prevent the pressure difference before and after the electric three-way valve at the water inlet from being too large, causing damage due to excessive torque when the electric three-way valve at the water inlet is actuated; on the other hand, it can prevent the water pressure from dropping when switching from a full barrel to an empty barrel.

[0031] The first barrel body and the second barrel body of the double barrel filter have the same structure. The first barrel body is provided with an exhaust valve at the top and a vent valve at the bottom. A filter screen is provided inside, and the filter screen accuracy is ≤200μm.

[0032] By setting up a double-barrel filter, solid particles ≥200 in the cooling water can be blocked, which can reduce roller wear on the one hand, and reduce wear on the valve seal after the filter on the other hand, thus extending the service life.

[0033] An online water quality monitoring water intake mechanism is arranged behind the valve group. The online water quality monitoring water intake mechanism is directly connected to an external testing device, which is used to sample the filtered turbid water and conduct real-time testing of suspended matter and pH value. When the suspended solids content is ≤10 mg / L, normal production is carried out; When the suspended solids content is 10-30 mg / L, an alarm will be sounded and sewage needs to be discharged when changing vehicles or tanks. When the floating matter content is ≥30 mg / L, a rolling mill jump delay signal is issued, and the rolling mill is forced to stop after this steel passes, thereby protecting the rolling mill.

[0034] When the pH is between 7.5 and 8.5, normal production occurs. When the pH is less than 7.5 or greater than 8.5, an alarm signal is issued by the alarm mechanism connected to the assay device. During the use of cemented carbide composite rollers, the temperature of red steel is around 900-1000C. At this high temperature, the cooling water forms a layer of air film covering the surface of the rolling groove. At this time, in order to fully cool the rolling groove, the air film must be broken, and breaking the air film requires sufficient pressure of the cooling water. Practice has shown that the cooling water pressure (at the outlet) must be above 0.2MPa to break the air film, and it will have a significant effect only when it reaches 0.4MPa. Sufficient cooling water pressure and another function ensure that heat is quickly taken away; at the same time, the black skin stuck to the surface of the roller is washed away, reducing roller wear and increasing rolling volume. Therefore, a flow meter, pressure gauge, and thermometer are installed behind the online water quality monitoring device. When the production specification is a cutting, the water consumption of a single rolling mill is 30a m³ / h, the water pressure is 0.6 MPa, and the water temperature needs to be ≤35℃; When the water pressure is between 0.6 and 0.7 MPa, normal production occurs. When the water pressure is less than 0.6 MPa or greater than 0.7 MPa, an alarm is sounded through the alarm mechanism. When the water pressure is ≤ 0.3 MPa, the central control mechanism sends a mill trip signal to force the mill to stop, thereby protecting the rolls. The central control mechanism may be capable of realizing the above functions.

[0035] A water distribution package is set behind the instrument to distribute water to the roller cooling water nozzle at a stable pressure. The water distribution package and the cooling nozzle assembly are connected by a metal hose.

[0036] The cooling nozzle assembly includes a first upper roll ring cooling nozzle assembly, a second upper roll ring cooling nozzle assembly, a first lower roll ring cooling nozzle assembly and a second lower roll ring cooling nozzle assembly. The first upper roll ring cooling nozzle assembly, the second upper roll ring cooling nozzle assembly, the first lower roll ring cooling nozzle assembly and the second lower roll ring cooling nozzle assembly are all connected to the water distribution package. The first upper roll ring cooling nozzle assembly and the first lower roll ring cooling nozzle assembly are both provided with two types of nozzles, both of which are in the form of flat tubes, and the diameter length corresponds to the rolling groove width; the second upper roll cooling nozzle assembly is arranged at about one-third of the roll circumference starting from the steel outlet.

[0037] The first upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring close to the exit guide, and the second upper roller ring cooling nozzle assembly on the first upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring away from the exit guide.

[0038] The first lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring close to the exit guide, and the second lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring away from the exit guide.

[0039] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling water system for a cemented carbide composite roll, characterized in that: include: A variable frequency water supply pump, a double barrel filter, a first bypass, a first manual valve, a shut-off valve, a second manual valve, a third manual valve, an online water quality monitoring water intake mechanism, a measuring instrument and a water distribution package, wherein the variable frequency water supply pump is connected to the double barrel filter, the first bypass is arranged on one side of the double barrel filter, the double barrel filters are connected in parallel, the double barrel filter is sequentially connected to the first manual valve, the shut-off valve and the second manual valve, the water inlet end of the third manual valve is connected to the water inlet end of the first manual valve, the water outlet end of the third manual valve is connected to the water outlet end of the second manual valve, the second manual valve is connected to the measuring instrument, an online water quality monitoring water intake mechanism is arranged on the pipeline between the second manual valve and the measuring instrument, the measuring instrument is connected to the water distribution package, and the water distribution package is connected to the cooling nozzle assembly through a hose.

2. The cooling water system for cemented carbide composite rolls according to claim 1, characterized in that: The double barrel filter comprises: a first barrel body and a second barrel body, the first barrel body and the second barrel body have the same structure, two connecting pipes are arranged between the first barrel body and the second barrel body, an electric three-way valve for water inlet is arranged on the connecting pipe on the upper side, and an electric three-way valve for water outlet is arranged on the connecting pipe on the lower side, and connecting valves are arranged in parallel at both the inlet three-way valve and the outlet three-way valve.

3. The cooling water system for cemented carbide composite rolls according to claim 2 is characterized in that: An exhaust valve is arranged at the upper end of the first barrel body, a vent valve is arranged at the lower end of the first barrel body, a filter is arranged inside the first barrel body, and a pressure difference transmitter is arranged on the side of the first barrel body.

4. The cooling water system for cemented carbide composite rolls according to claim 3 is characterized in that: The cooling nozzle assembly includes a first upper roller ring cooling nozzle assembly, a second upper roller ring cooling nozzle assembly, a first lower roller ring cooling nozzle assembly and a second lower roller ring cooling nozzle assembly. The first upper roller ring cooling nozzle assembly, the second upper roller ring cooling nozzle assembly, the first lower roller ring cooling nozzle assembly and the second lower roller ring cooling nozzle assembly are all connected to the water distribution package.

5. The cooling water system for cemented carbide composite rolls according to claim 4, characterized in that: The first upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring close to the exit guide, and the second upper roller ring cooling nozzle assembly is arranged on a side of the upper roller ring away from the exit guide.

6. The cooling water system for cemented carbide composite rolls according to claim 5, characterized in that: The first lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring close to the exit guide, and the second lower roller ring cooling nozzle assembly is arranged on a side of the lower roller ring away from the exit guide.

7. The cooling water system for cemented carbide composite rolls according to claim 6, characterized in that: The rated flow rate of the variable frequency water supply pump is greater than or equal to 30ab m³ / h, and the head of the variable frequency water supply pump is greater than or equal to 80m.

8. The cooling water system for cemented carbide composite rolls according to claim 7, characterized in that: The accuracy of the filter is less than or equal to 200 μm.

9. The cooling water system for cemented carbide composite rolls according to claim 8, characterized in that: The first bypass includes a fourth manual valve, a first electric valve and a fifth manual valve, the fourth manual valve, the first electric valve and the fifth manual valve are connected in sequence, the water inlet end of the fourth manual valve is connected to the water inlet electric three-way valve of the double-barrel filter, and the water outlet end of the fifth manual valve is connected to the water outlet electric three-way valve of the double-barrel filter.

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